1 | /* Convert function calls to rtl insns, for GNU C compiler. |
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2 | Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. |
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3 | |
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4 | This file is part of GNU CC. |
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5 | |
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6 | GNU CC is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 2, or (at your option) |
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9 | any later version. |
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10 | |
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11 | GNU CC is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with GNU CC; see the file COPYING. If not, write to |
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18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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19 | Boston, MA 02111-1307, USA. */ |
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20 | |
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21 | #include "config.h" |
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22 | #include "rtl.h" |
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23 | #include "tree.h" |
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24 | #include "flags.h" |
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25 | #include "expr.h" |
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26 | #ifdef __STDC__ |
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27 | #include <stdarg.h> |
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28 | #else |
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29 | #include <varargs.h> |
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30 | #endif |
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31 | #include "insn-flags.h" |
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32 | |
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33 | /* Decide whether a function's arguments should be processed |
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34 | from first to last or from last to first. |
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35 | |
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36 | They should if the stack and args grow in opposite directions, but |
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37 | only if we have push insns. */ |
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38 | |
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39 | #ifdef PUSH_ROUNDING |
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40 | |
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41 | #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD) |
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42 | #define PUSH_ARGS_REVERSED /* If it's last to first */ |
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43 | #endif |
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44 | |
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45 | #endif |
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46 | |
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47 | /* Like STACK_BOUNDARY but in units of bytes, not bits. */ |
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48 | #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT) |
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49 | |
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50 | /* Data structure and subroutines used within expand_call. */ |
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51 | |
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52 | struct arg_data |
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53 | { |
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54 | /* Tree node for this argument. */ |
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55 | tree tree_value; |
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56 | /* Mode for value; TYPE_MODE unless promoted. */ |
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57 | enum machine_mode mode; |
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58 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
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59 | rtx value; |
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60 | /* Initially-compute RTL value for argument; only for const functions. */ |
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61 | rtx initial_value; |
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62 | /* Register to pass this argument in, 0 if passed on stack, or an |
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63 | EXPR_LIST if the arg is to be copied into multiple different |
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64 | registers. */ |
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65 | rtx reg; |
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66 | /* If REG was promoted from the actual mode of the argument expression, |
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67 | indicates whether the promotion is sign- or zero-extended. */ |
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68 | int unsignedp; |
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69 | /* Number of registers to use. 0 means put the whole arg in registers. |
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70 | Also 0 if not passed in registers. */ |
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71 | int partial; |
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72 | /* Non-zero if argument must be passed on stack. |
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73 | Note that some arguments may be passed on the stack |
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74 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. |
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75 | pass_on_stack identifies arguments that *cannot* go in registers. */ |
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76 | int pass_on_stack; |
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77 | /* Offset of this argument from beginning of stack-args. */ |
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78 | struct args_size offset; |
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79 | /* Similar, but offset to the start of the stack slot. Different from |
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80 | OFFSET if this arg pads downward. */ |
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81 | struct args_size slot_offset; |
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82 | /* Size of this argument on the stack, rounded up for any padding it gets, |
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83 | parts of the argument passed in registers do not count. |
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84 | If REG_PARM_STACK_SPACE is defined, then register parms |
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85 | are counted here as well. */ |
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86 | struct args_size size; |
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87 | /* Location on the stack at which parameter should be stored. The store |
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88 | has already been done if STACK == VALUE. */ |
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89 | rtx stack; |
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90 | /* Location on the stack of the start of this argument slot. This can |
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91 | differ from STACK if this arg pads downward. This location is known |
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92 | to be aligned to FUNCTION_ARG_BOUNDARY. */ |
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93 | rtx stack_slot; |
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94 | #ifdef ACCUMULATE_OUTGOING_ARGS |
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95 | /* Place that this stack area has been saved, if needed. */ |
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96 | rtx save_area; |
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97 | #endif |
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98 | #ifdef STRICT_ALIGNMENT |
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99 | /* If an argument's alignment does not permit direct copying into registers, |
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100 | copy in smaller-sized pieces into pseudos. These are stored in a |
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101 | block pointed to by this field. The next field says how many |
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102 | word-sized pseudos we made. */ |
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103 | rtx *aligned_regs; |
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104 | int n_aligned_regs; |
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105 | #endif |
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106 | }; |
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107 | |
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108 | #ifdef ACCUMULATE_OUTGOING_ARGS |
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109 | /* A vector of one char per byte of stack space. A byte if non-zero if |
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110 | the corresponding stack location has been used. |
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111 | This vector is used to prevent a function call within an argument from |
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112 | clobbering any stack already set up. */ |
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113 | static char *stack_usage_map; |
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114 | |
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115 | /* Size of STACK_USAGE_MAP. */ |
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116 | static int highest_outgoing_arg_in_use; |
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117 | |
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118 | /* stack_arg_under_construction is nonzero when an argument may be |
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119 | initialized with a constructor call (including a C function that |
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120 | returns a BLKmode struct) and expand_call must take special action |
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121 | to make sure the object being constructed does not overlap the |
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122 | argument list for the constructor call. */ |
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123 | int stack_arg_under_construction; |
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124 | #endif |
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125 | |
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126 | static int calls_function PROTO((tree, int)); |
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127 | static int calls_function_1 PROTO((tree, int)); |
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128 | static void emit_call_1 PROTO((rtx, tree, tree, int, int, rtx, rtx, |
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129 | int, rtx, int)); |
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130 | static void store_one_arg PROTO ((struct arg_data *, rtx, int, int, |
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131 | tree, int)); |
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132 | |
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133 | /* If WHICH is 1, return 1 if EXP contains a call to the built-in function |
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134 | `alloca'. |
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135 | |
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136 | If WHICH is 0, return 1 if EXP contains a call to any function. |
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137 | Actually, we only need return 1 if evaluating EXP would require pushing |
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138 | arguments on the stack, but that is too difficult to compute, so we just |
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139 | assume any function call might require the stack. */ |
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140 | |
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141 | static tree calls_function_save_exprs; |
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142 | |
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143 | static int |
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144 | calls_function (exp, which) |
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145 | tree exp; |
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146 | int which; |
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147 | { |
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148 | int val; |
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149 | calls_function_save_exprs = 0; |
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150 | val = calls_function_1 (exp, which); |
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151 | calls_function_save_exprs = 0; |
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152 | return val; |
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153 | } |
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154 | |
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155 | static int |
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156 | calls_function_1 (exp, which) |
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157 | tree exp; |
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158 | int which; |
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159 | { |
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160 | register int i; |
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161 | enum tree_code code = TREE_CODE (exp); |
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162 | int type = TREE_CODE_CLASS (code); |
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163 | int length = tree_code_length[(int) code]; |
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164 | |
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165 | /* If this code is language-specific, we don't know what it will do. */ |
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166 | if ((int) code >= NUM_TREE_CODES) |
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167 | return 1; |
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168 | |
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169 | /* Only expressions and references can contain calls. */ |
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170 | if (type != 'e' && type != '<' && type != '1' && type != '2' && type != 'r' |
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171 | && type != 'b') |
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172 | return 0; |
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173 | |
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174 | switch (code) |
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175 | { |
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176 | case CALL_EXPR: |
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177 | if (which == 0) |
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178 | return 1; |
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179 | else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR |
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180 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) |
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181 | == FUNCTION_DECL)) |
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182 | { |
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183 | tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); |
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184 | |
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185 | if ((DECL_BUILT_IN (fndecl) |
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186 | && DECL_FUNCTION_CODE (fndecl) == BUILT_IN_ALLOCA) |
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187 | || (DECL_SAVED_INSNS (fndecl) |
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188 | && (FUNCTION_FLAGS (DECL_SAVED_INSNS (fndecl)) |
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189 | & FUNCTION_FLAGS_CALLS_ALLOCA))) |
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190 | return 1; |
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191 | } |
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192 | |
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193 | /* Third operand is RTL. */ |
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194 | length = 2; |
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195 | break; |
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196 | |
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197 | case SAVE_EXPR: |
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198 | if (SAVE_EXPR_RTL (exp) != 0) |
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199 | return 0; |
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200 | if (value_member (exp, calls_function_save_exprs)) |
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201 | return 0; |
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202 | calls_function_save_exprs = tree_cons (NULL_TREE, exp, |
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203 | calls_function_save_exprs); |
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204 | return (TREE_OPERAND (exp, 0) != 0 |
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205 | && calls_function_1 (TREE_OPERAND (exp, 0), which)); |
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206 | |
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207 | case BLOCK: |
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208 | { |
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209 | register tree local; |
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210 | |
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211 | for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local)) |
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212 | if (DECL_INITIAL (local) != 0 |
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213 | && calls_function_1 (DECL_INITIAL (local), which)) |
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214 | return 1; |
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215 | } |
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216 | { |
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217 | register tree subblock; |
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218 | |
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219 | for (subblock = BLOCK_SUBBLOCKS (exp); |
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220 | subblock; |
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221 | subblock = TREE_CHAIN (subblock)) |
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222 | if (calls_function_1 (subblock, which)) |
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223 | return 1; |
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224 | } |
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225 | return 0; |
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226 | |
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227 | case METHOD_CALL_EXPR: |
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228 | length = 3; |
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229 | break; |
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230 | |
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231 | case WITH_CLEANUP_EXPR: |
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232 | length = 1; |
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233 | break; |
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234 | |
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235 | case RTL_EXPR: |
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236 | return 0; |
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237 | } |
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238 | |
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239 | for (i = 0; i < length; i++) |
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240 | if (TREE_OPERAND (exp, i) != 0 |
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241 | && calls_function_1 (TREE_OPERAND (exp, i), which)) |
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242 | return 1; |
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243 | |
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244 | return 0; |
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245 | } |
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246 | |
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247 | /* Force FUNEXP into a form suitable for the address of a CALL, |
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248 | and return that as an rtx. Also load the static chain register |
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249 | if FNDECL is a nested function. |
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250 | |
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251 | CALL_FUSAGE points to a variable holding the prospective |
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252 | CALL_INSN_FUNCTION_USAGE information. */ |
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253 | |
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254 | rtx |
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255 | prepare_call_address (funexp, fndecl, call_fusage, reg_parm_seen) |
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256 | rtx funexp; |
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257 | tree fndecl; |
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258 | rtx *call_fusage; |
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259 | int reg_parm_seen; |
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260 | { |
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261 | rtx static_chain_value = 0; |
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262 | |
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263 | funexp = protect_from_queue (funexp, 0); |
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264 | |
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265 | if (fndecl != 0) |
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266 | /* Get possible static chain value for nested function in C. */ |
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267 | static_chain_value = lookup_static_chain (fndecl); |
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268 | |
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269 | /* Make a valid memory address and copy constants thru pseudo-regs, |
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270 | but not for a constant address if -fno-function-cse. */ |
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271 | if (GET_CODE (funexp) != SYMBOL_REF) |
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272 | funexp = |
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273 | #ifdef SMALL_REGISTER_CLASSES |
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274 | /* If we are using registers for parameters, force the |
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275 | function address into a register now. */ |
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276 | reg_parm_seen ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) |
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277 | : |
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278 | #endif |
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279 | memory_address (FUNCTION_MODE, funexp); |
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280 | else |
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281 | { |
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282 | #ifndef NO_FUNCTION_CSE |
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283 | if (optimize && ! flag_no_function_cse) |
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284 | #ifdef NO_RECURSIVE_FUNCTION_CSE |
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285 | if (fndecl != current_function_decl) |
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286 | #endif |
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287 | funexp = force_reg (Pmode, funexp); |
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288 | #endif |
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289 | } |
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290 | |
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291 | if (static_chain_value != 0) |
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292 | { |
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293 | emit_move_insn (static_chain_rtx, static_chain_value); |
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294 | |
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295 | if (GET_CODE (static_chain_rtx) == REG) |
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296 | use_reg (call_fusage, static_chain_rtx); |
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297 | } |
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298 | |
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299 | return funexp; |
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300 | } |
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301 | |
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302 | /* Generate instructions to call function FUNEXP, |
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303 | and optionally pop the results. |
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304 | The CALL_INSN is the first insn generated. |
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305 | |
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306 | FNDECL is the declaration node of the function. This is given ot the |
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307 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. |
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308 | |
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309 | FUNTYPE is the data type of the function, or, for a library call, |
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310 | the identifier for the name of the call. This is given to the |
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311 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. |
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312 | |
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313 | STACK_SIZE is the number of bytes of arguments on the stack, |
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314 | rounded up to STACK_BOUNDARY; zero if the size is variable. |
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315 | This is both to put into the call insn and |
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316 | to generate explicit popping code if necessary. |
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317 | |
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318 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. |
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319 | It is zero if this call doesn't want a structure value. |
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320 | |
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321 | NEXT_ARG_REG is the rtx that results from executing |
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322 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) |
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323 | just after all the args have had their registers assigned. |
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324 | This could be whatever you like, but normally it is the first |
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325 | arg-register beyond those used for args in this call, |
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326 | or 0 if all the arg-registers are used in this call. |
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327 | It is passed on to `gen_call' so you can put this info in the call insn. |
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328 | |
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329 | VALREG is a hard register in which a value is returned, |
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330 | or 0 if the call does not return a value. |
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331 | |
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332 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before |
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333 | the args to this call were processed. |
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334 | We restore `inhibit_defer_pop' to that value. |
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335 | |
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336 | CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that |
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337 | denote registers used by the called function. |
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338 | |
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339 | IS_CONST is true if this is a `const' call. */ |
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340 | |
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341 | static void |
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342 | emit_call_1 (funexp, fndecl, funtype, stack_size, struct_value_size, |
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343 | next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
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344 | is_const) |
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345 | rtx funexp; |
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346 | tree fndecl; |
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347 | tree funtype; |
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348 | int stack_size; |
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349 | int struct_value_size; |
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350 | rtx next_arg_reg; |
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351 | rtx valreg; |
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352 | int old_inhibit_defer_pop; |
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353 | rtx call_fusage; |
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354 | int is_const; |
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355 | { |
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356 | rtx stack_size_rtx = GEN_INT (stack_size); |
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357 | rtx struct_value_size_rtx = GEN_INT (struct_value_size); |
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358 | rtx call_insn; |
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359 | int already_popped = 0; |
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360 | |
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361 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, |
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362 | and we don't want to load it into a register as an optimization, |
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363 | because prepare_call_address already did it if it should be done. */ |
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364 | if (GET_CODE (funexp) != SYMBOL_REF) |
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365 | funexp = memory_address (FUNCTION_MODE, funexp); |
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366 | |
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367 | #ifndef ACCUMULATE_OUTGOING_ARGS |
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368 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) |
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369 | if (HAVE_call_pop && HAVE_call_value_pop |
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370 | && (RETURN_POPS_ARGS (fndecl, funtype, stack_size) > 0 |
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371 | || stack_size == 0)) |
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372 | { |
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373 | rtx n_pop = GEN_INT (RETURN_POPS_ARGS (fndecl, funtype, stack_size)); |
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374 | rtx pat; |
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375 | |
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376 | /* If this subroutine pops its own args, record that in the call insn |
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377 | if possible, for the sake of frame pointer elimination. */ |
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378 | |
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379 | if (valreg) |
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380 | pat = gen_call_value_pop (valreg, |
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381 | gen_rtx (MEM, FUNCTION_MODE, funexp), |
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382 | stack_size_rtx, next_arg_reg, n_pop); |
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383 | else |
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384 | pat = gen_call_pop (gen_rtx (MEM, FUNCTION_MODE, funexp), |
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385 | stack_size_rtx, next_arg_reg, n_pop); |
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386 | |
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387 | emit_call_insn (pat); |
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388 | already_popped = 1; |
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389 | } |
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390 | else |
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391 | #endif |
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392 | #endif |
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393 | |
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394 | #if defined (HAVE_call) && defined (HAVE_call_value) |
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395 | if (HAVE_call && HAVE_call_value) |
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396 | { |
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397 | if (valreg) |
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398 | emit_call_insn (gen_call_value (valreg, |
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399 | gen_rtx (MEM, FUNCTION_MODE, funexp), |
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400 | stack_size_rtx, next_arg_reg, |
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401 | NULL_RTX)); |
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402 | else |
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403 | emit_call_insn (gen_call (gen_rtx (MEM, FUNCTION_MODE, funexp), |
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404 | stack_size_rtx, next_arg_reg, |
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405 | struct_value_size_rtx)); |
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406 | } |
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407 | else |
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408 | #endif |
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409 | abort (); |
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410 | |
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411 | /* Find the CALL insn we just emitted. */ |
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412 | for (call_insn = get_last_insn (); |
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413 | call_insn && GET_CODE (call_insn) != CALL_INSN; |
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414 | call_insn = PREV_INSN (call_insn)) |
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415 | ; |
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416 | |
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417 | if (! call_insn) |
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418 | abort (); |
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419 | |
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420 | /* Put the register usage information on the CALL. If there is already |
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421 | some usage information, put ours at the end. */ |
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422 | if (CALL_INSN_FUNCTION_USAGE (call_insn)) |
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423 | { |
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424 | rtx link; |
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425 | |
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426 | for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0; |
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427 | link = XEXP (link, 1)) |
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428 | ; |
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429 | |
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430 | XEXP (link, 1) = call_fusage; |
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431 | } |
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432 | else |
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433 | CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage; |
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434 | |
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435 | /* If this is a const call, then set the insn's unchanging bit. */ |
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436 | if (is_const) |
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437 | CONST_CALL_P (call_insn) = 1; |
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438 | |
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439 | /* Restore this now, so that we do defer pops for this call's args |
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440 | if the context of the call as a whole permits. */ |
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441 | inhibit_defer_pop = old_inhibit_defer_pop; |
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442 | |
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443 | #ifndef ACCUMULATE_OUTGOING_ARGS |
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444 | /* If returning from the subroutine does not automatically pop the args, |
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445 | we need an instruction to pop them sooner or later. |
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446 | Perhaps do it now; perhaps just record how much space to pop later. |
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447 | |
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448 | If returning from the subroutine does pop the args, indicate that the |
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449 | stack pointer will be changed. */ |
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450 | |
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451 | if (stack_size != 0 && RETURN_POPS_ARGS (fndecl, funtype, stack_size) > 0) |
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452 | { |
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453 | if (!already_popped) |
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454 | CALL_INSN_FUNCTION_USAGE (call_insn) = |
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455 | gen_rtx (EXPR_LIST, VOIDmode, |
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456 | gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx), |
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457 | CALL_INSN_FUNCTION_USAGE (call_insn)); |
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458 | stack_size -= RETURN_POPS_ARGS (fndecl, funtype, stack_size); |
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459 | stack_size_rtx = GEN_INT (stack_size); |
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460 | } |
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461 | |
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462 | if (stack_size != 0) |
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463 | { |
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464 | if (flag_defer_pop && inhibit_defer_pop == 0 && !is_const) |
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465 | pending_stack_adjust += stack_size; |
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466 | else |
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467 | adjust_stack (stack_size_rtx); |
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468 | } |
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469 | #endif |
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470 | } |
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471 | |
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472 | /* Generate all the code for a function call |
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473 | and return an rtx for its value. |
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474 | Store the value in TARGET (specified as an rtx) if convenient. |
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475 | If the value is stored in TARGET then TARGET is returned. |
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476 | If IGNORE is nonzero, then we ignore the value of the function call. */ |
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477 | |
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478 | rtx |
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479 | expand_call (exp, target, ignore) |
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480 | tree exp; |
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481 | rtx target; |
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482 | int ignore; |
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483 | { |
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484 | /* List of actual parameters. */ |
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485 | tree actparms = TREE_OPERAND (exp, 1); |
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486 | /* RTX for the function to be called. */ |
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487 | rtx funexp; |
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488 | /* Tree node for the function to be called (not the address!). */ |
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489 | tree funtree; |
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490 | /* Data type of the function. */ |
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491 | tree funtype; |
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492 | /* Declaration of the function being called, |
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493 | or 0 if the function is computed (not known by name). */ |
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494 | tree fndecl = 0; |
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495 | char *name = 0; |
---|
496 | |
---|
497 | /* Register in which non-BLKmode value will be returned, |
---|
498 | or 0 if no value or if value is BLKmode. */ |
---|
499 | rtx valreg; |
---|
500 | /* Address where we should return a BLKmode value; |
---|
501 | 0 if value not BLKmode. */ |
---|
502 | rtx structure_value_addr = 0; |
---|
503 | /* Nonzero if that address is being passed by treating it as |
---|
504 | an extra, implicit first parameter. Otherwise, |
---|
505 | it is passed by being copied directly into struct_value_rtx. */ |
---|
506 | int structure_value_addr_parm = 0; |
---|
507 | /* Size of aggregate value wanted, or zero if none wanted |
---|
508 | or if we are using the non-reentrant PCC calling convention |
---|
509 | or expecting the value in registers. */ |
---|
510 | int struct_value_size = 0; |
---|
511 | /* Nonzero if called function returns an aggregate in memory PCC style, |
---|
512 | by returning the address of where to find it. */ |
---|
513 | int pcc_struct_value = 0; |
---|
514 | |
---|
515 | /* Number of actual parameters in this call, including struct value addr. */ |
---|
516 | int num_actuals; |
---|
517 | /* Number of named args. Args after this are anonymous ones |
---|
518 | and they must all go on the stack. */ |
---|
519 | int n_named_args; |
---|
520 | /* Count arg position in order args appear. */ |
---|
521 | int argpos; |
---|
522 | |
---|
523 | /* Vector of information about each argument. |
---|
524 | Arguments are numbered in the order they will be pushed, |
---|
525 | not the order they are written. */ |
---|
526 | struct arg_data *args; |
---|
527 | |
---|
528 | /* Total size in bytes of all the stack-parms scanned so far. */ |
---|
529 | struct args_size args_size; |
---|
530 | /* Size of arguments before any adjustments (such as rounding). */ |
---|
531 | struct args_size original_args_size; |
---|
532 | /* Data on reg parms scanned so far. */ |
---|
533 | CUMULATIVE_ARGS args_so_far; |
---|
534 | /* Nonzero if a reg parm has been scanned. */ |
---|
535 | int reg_parm_seen; |
---|
536 | /* Nonzero if this is an indirect function call. */ |
---|
537 | int current_call_is_indirect = 0; |
---|
538 | |
---|
539 | /* Nonzero if we must avoid push-insns in the args for this call. |
---|
540 | If stack space is allocated for register parameters, but not by the |
---|
541 | caller, then it is preallocated in the fixed part of the stack frame. |
---|
542 | So the entire argument block must then be preallocated (i.e., we |
---|
543 | ignore PUSH_ROUNDING in that case). */ |
---|
544 | |
---|
545 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) |
---|
546 | int must_preallocate = 1; |
---|
547 | #else |
---|
548 | #ifdef PUSH_ROUNDING |
---|
549 | int must_preallocate = 0; |
---|
550 | #else |
---|
551 | int must_preallocate = 1; |
---|
552 | #endif |
---|
553 | #endif |
---|
554 | |
---|
555 | /* Size of the stack reserved for parameter registers. */ |
---|
556 | int reg_parm_stack_space = 0; |
---|
557 | |
---|
558 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ |
---|
559 | int inc; |
---|
560 | /* Address of space preallocated for stack parms |
---|
561 | (on machines that lack push insns), or 0 if space not preallocated. */ |
---|
562 | rtx argblock = 0; |
---|
563 | |
---|
564 | /* Nonzero if it is plausible that this is a call to alloca. */ |
---|
565 | int may_be_alloca; |
---|
566 | /* Nonzero if this is a call to setjmp or a related function. */ |
---|
567 | int returns_twice; |
---|
568 | /* Nonzero if this is a call to `longjmp'. */ |
---|
569 | int is_longjmp; |
---|
570 | /* Nonzero if this is a call to an inline function. */ |
---|
571 | int is_integrable = 0; |
---|
572 | /* Nonzero if this is a call to a `const' function. |
---|
573 | Note that only explicitly named functions are handled as `const' here. */ |
---|
574 | int is_const = 0; |
---|
575 | /* Nonzero if this is a call to a `volatile' function. */ |
---|
576 | int is_volatile = 0; |
---|
577 | #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE) |
---|
578 | /* Define the boundary of the register parm stack space that needs to be |
---|
579 | save, if any. */ |
---|
580 | int low_to_save = -1, high_to_save; |
---|
581 | rtx save_area = 0; /* Place that it is saved */ |
---|
582 | #endif |
---|
583 | |
---|
584 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
585 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; |
---|
586 | char *initial_stack_usage_map = stack_usage_map; |
---|
587 | #endif |
---|
588 | |
---|
589 | rtx old_stack_level = 0; |
---|
590 | int old_pending_adj = 0; |
---|
591 | int old_stack_arg_under_construction; |
---|
592 | int old_inhibit_defer_pop = inhibit_defer_pop; |
---|
593 | tree old_cleanups = cleanups_this_call; |
---|
594 | rtx call_fusage = 0; |
---|
595 | register tree p; |
---|
596 | register int i, j; |
---|
597 | |
---|
598 | /* See if we can find a DECL-node for the actual function. |
---|
599 | As a result, decide whether this is a call to an integrable function. */ |
---|
600 | |
---|
601 | p = TREE_OPERAND (exp, 0); |
---|
602 | if (TREE_CODE (p) == ADDR_EXPR) |
---|
603 | { |
---|
604 | fndecl = TREE_OPERAND (p, 0); |
---|
605 | if (TREE_CODE (fndecl) != FUNCTION_DECL) |
---|
606 | fndecl = 0; |
---|
607 | else |
---|
608 | { |
---|
609 | if (!flag_no_inline |
---|
610 | && fndecl != current_function_decl |
---|
611 | && DECL_INLINE (fndecl) |
---|
612 | && DECL_SAVED_INSNS (fndecl)) |
---|
613 | is_integrable = 1; |
---|
614 | else if (! TREE_ADDRESSABLE (fndecl)) |
---|
615 | { |
---|
616 | /* In case this function later becomes inlinable, |
---|
617 | record that there was already a non-inline call to it. |
---|
618 | |
---|
619 | Use abstraction instead of setting TREE_ADDRESSABLE |
---|
620 | directly. */ |
---|
621 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline) |
---|
622 | { |
---|
623 | warning_with_decl (fndecl, "can't inline call to `%s'"); |
---|
624 | warning ("called from here"); |
---|
625 | } |
---|
626 | mark_addressable (fndecl); |
---|
627 | } |
---|
628 | |
---|
629 | if (TREE_READONLY (fndecl) && ! TREE_THIS_VOLATILE (fndecl) |
---|
630 | && TYPE_MODE (TREE_TYPE (exp)) != VOIDmode) |
---|
631 | is_const = 1; |
---|
632 | |
---|
633 | if (TREE_THIS_VOLATILE (fndecl)) |
---|
634 | is_volatile = 1; |
---|
635 | } |
---|
636 | } |
---|
637 | |
---|
638 | /* If we don't have specific function to call, see if we have a |
---|
639 | constant or `noreturn' function from the type. */ |
---|
640 | if (fndecl == 0) |
---|
641 | { |
---|
642 | is_const = TREE_READONLY (TREE_TYPE (TREE_TYPE (p))); |
---|
643 | is_volatile = TREE_THIS_VOLATILE (TREE_TYPE (TREE_TYPE (p))); |
---|
644 | } |
---|
645 | |
---|
646 | #ifdef REG_PARM_STACK_SPACE |
---|
647 | #ifdef MAYBE_REG_PARM_STACK_SPACE |
---|
648 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; |
---|
649 | #else |
---|
650 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); |
---|
651 | #endif |
---|
652 | #endif |
---|
653 | |
---|
654 | /* Warn if this value is an aggregate type, |
---|
655 | regardless of which calling convention we are using for it. */ |
---|
656 | if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp))) |
---|
657 | warning ("function call has aggregate value"); |
---|
658 | |
---|
659 | /* Set up a place to return a structure. */ |
---|
660 | |
---|
661 | /* Cater to broken compilers. */ |
---|
662 | if (aggregate_value_p (exp)) |
---|
663 | { |
---|
664 | /* This call returns a big structure. */ |
---|
665 | is_const = 0; |
---|
666 | |
---|
667 | #ifdef PCC_STATIC_STRUCT_RETURN |
---|
668 | { |
---|
669 | pcc_struct_value = 1; |
---|
670 | /* Easier than making that case work right. */ |
---|
671 | if (is_integrable) |
---|
672 | { |
---|
673 | /* In case this is a static function, note that it has been |
---|
674 | used. */ |
---|
675 | if (! TREE_ADDRESSABLE (fndecl)) |
---|
676 | mark_addressable (fndecl); |
---|
677 | is_integrable = 0; |
---|
678 | } |
---|
679 | } |
---|
680 | #else /* not PCC_STATIC_STRUCT_RETURN */ |
---|
681 | { |
---|
682 | struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); |
---|
683 | |
---|
684 | if (target && GET_CODE (target) == MEM) |
---|
685 | structure_value_addr = XEXP (target, 0); |
---|
686 | else |
---|
687 | { |
---|
688 | /* Assign a temporary on the stack to hold the value. */ |
---|
689 | |
---|
690 | /* For variable-sized objects, we must be called with a target |
---|
691 | specified. If we were to allocate space on the stack here, |
---|
692 | we would have no way of knowing when to free it. */ |
---|
693 | |
---|
694 | if (struct_value_size < 0) |
---|
695 | abort (); |
---|
696 | |
---|
697 | structure_value_addr |
---|
698 | = XEXP (assign_stack_temp (BLKmode, struct_value_size, 1), 0); |
---|
699 | MEM_IN_STRUCT_P (structure_value_addr) |
---|
700 | = AGGREGATE_TYPE_P (TREE_TYPE (exp)); |
---|
701 | target = 0; |
---|
702 | } |
---|
703 | } |
---|
704 | #endif /* not PCC_STATIC_STRUCT_RETURN */ |
---|
705 | } |
---|
706 | |
---|
707 | /* If called function is inline, try to integrate it. */ |
---|
708 | |
---|
709 | if (is_integrable) |
---|
710 | { |
---|
711 | rtx temp; |
---|
712 | rtx before_call = get_last_insn (); |
---|
713 | |
---|
714 | temp = expand_inline_function (fndecl, actparms, target, |
---|
715 | ignore, TREE_TYPE (exp), |
---|
716 | structure_value_addr); |
---|
717 | |
---|
718 | /* If inlining succeeded, return. */ |
---|
719 | if ((HOST_WIDE_INT) temp != -1) |
---|
720 | { |
---|
721 | if (flag_short_temps) |
---|
722 | { |
---|
723 | /* Perform all cleanups needed for the arguments of this |
---|
724 | call (i.e. destructors in C++). It is ok if these |
---|
725 | destructors clobber RETURN_VALUE_REG, because the |
---|
726 | only time we care about this is when TARGET is that |
---|
727 | register. But in C++, we take care to never return |
---|
728 | that register directly. */ |
---|
729 | expand_cleanups_to (old_cleanups); |
---|
730 | } |
---|
731 | |
---|
732 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
733 | /* If the outgoing argument list must be preserved, push |
---|
734 | the stack before executing the inlined function if it |
---|
735 | makes any calls. */ |
---|
736 | |
---|
737 | for (i = reg_parm_stack_space - 1; i >= 0; i--) |
---|
738 | if (i < highest_outgoing_arg_in_use && stack_usage_map[i] != 0) |
---|
739 | break; |
---|
740 | |
---|
741 | if (stack_arg_under_construction || i >= 0) |
---|
742 | { |
---|
743 | rtx insn = NEXT_INSN (before_call), seq; |
---|
744 | |
---|
745 | /* Look for a call in the inline function code. |
---|
746 | If OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) is |
---|
747 | nonzero then there is a call and it is not necessary |
---|
748 | to scan the insns. */ |
---|
749 | |
---|
750 | if (OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)) == 0) |
---|
751 | for (; insn; insn = NEXT_INSN (insn)) |
---|
752 | if (GET_CODE (insn) == CALL_INSN) |
---|
753 | break; |
---|
754 | |
---|
755 | if (insn) |
---|
756 | { |
---|
757 | /* Reserve enough stack space so that the largest |
---|
758 | argument list of any function call in the inline |
---|
759 | function does not overlap the argument list being |
---|
760 | evaluated. This is usually an overestimate because |
---|
761 | allocate_dynamic_stack_space reserves space for an |
---|
762 | outgoing argument list in addition to the requested |
---|
763 | space, but there is no way to ask for stack space such |
---|
764 | that an argument list of a certain length can be |
---|
765 | safely constructed. */ |
---|
766 | |
---|
767 | int adjust = OUTGOING_ARGS_SIZE (DECL_SAVED_INSNS (fndecl)); |
---|
768 | #ifdef REG_PARM_STACK_SPACE |
---|
769 | /* Add the stack space reserved for register arguments |
---|
770 | in the inline function. What is really needed is the |
---|
771 | largest value of reg_parm_stack_space in the inline |
---|
772 | function, but that is not available. Using the current |
---|
773 | value of reg_parm_stack_space is wrong, but gives |
---|
774 | correct results on all supported machines. */ |
---|
775 | adjust += reg_parm_stack_space; |
---|
776 | #endif |
---|
777 | start_sequence (); |
---|
778 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
---|
779 | allocate_dynamic_stack_space (GEN_INT (adjust), |
---|
780 | NULL_RTX, BITS_PER_UNIT); |
---|
781 | seq = get_insns (); |
---|
782 | end_sequence (); |
---|
783 | emit_insns_before (seq, NEXT_INSN (before_call)); |
---|
784 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); |
---|
785 | } |
---|
786 | } |
---|
787 | #endif |
---|
788 | |
---|
789 | /* If the result is equivalent to TARGET, return TARGET to simplify |
---|
790 | checks in store_expr. They can be equivalent but not equal in the |
---|
791 | case of a function that returns BLKmode. */ |
---|
792 | if (temp != target && rtx_equal_p (temp, target)) |
---|
793 | return target; |
---|
794 | return temp; |
---|
795 | } |
---|
796 | |
---|
797 | /* If inlining failed, mark FNDECL as needing to be compiled |
---|
798 | separately after all. If function was declared inline, |
---|
799 | give a warning. */ |
---|
800 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline |
---|
801 | && ! TREE_ADDRESSABLE (fndecl)) |
---|
802 | { |
---|
803 | warning_with_decl (fndecl, "inlining failed in call to `%s'"); |
---|
804 | warning ("called from here"); |
---|
805 | } |
---|
806 | mark_addressable (fndecl); |
---|
807 | } |
---|
808 | |
---|
809 | /* When calling a const function, we must pop the stack args right away, |
---|
810 | so that the pop is deleted or moved with the call. */ |
---|
811 | if (is_const) |
---|
812 | NO_DEFER_POP; |
---|
813 | |
---|
814 | function_call_count++; |
---|
815 | |
---|
816 | if (fndecl && DECL_NAME (fndecl)) |
---|
817 | name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); |
---|
818 | |
---|
819 | /* On some machines (such as the PA) indirect calls have a different |
---|
820 | calling convention than normal calls. FUNCTION_ARG in the target |
---|
821 | description can look at current_call_is_indirect to determine which |
---|
822 | calling convention to use. */ |
---|
823 | current_call_is_indirect = (fndecl == 0); |
---|
824 | #if 0 |
---|
825 | = TREE_CODE (TREE_OPERAND (exp, 0)) == NON_LVALUE_EXPR ? 1 : 0; |
---|
826 | #endif |
---|
827 | |
---|
828 | #if 0 |
---|
829 | /* Unless it's a call to a specific function that isn't alloca, |
---|
830 | if it has one argument, we must assume it might be alloca. */ |
---|
831 | |
---|
832 | may_be_alloca = |
---|
833 | (!(fndecl != 0 && strcmp (name, "alloca")) |
---|
834 | && actparms != 0 |
---|
835 | && TREE_CHAIN (actparms) == 0); |
---|
836 | #else |
---|
837 | /* We assume that alloca will always be called by name. It |
---|
838 | makes no sense to pass it as a pointer-to-function to |
---|
839 | anything that does not understand its behavior. */ |
---|
840 | may_be_alloca = |
---|
841 | (name && ((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 |
---|
842 | && name[0] == 'a' |
---|
843 | && ! strcmp (name, "alloca")) |
---|
844 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 |
---|
845 | && name[0] == '_' |
---|
846 | && ! strcmp (name, "__builtin_alloca")))); |
---|
847 | #endif |
---|
848 | |
---|
849 | /* See if this is a call to a function that can return more than once |
---|
850 | or a call to longjmp. */ |
---|
851 | |
---|
852 | returns_twice = 0; |
---|
853 | is_longjmp = 0; |
---|
854 | |
---|
855 | if (name != 0 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 15) |
---|
856 | { |
---|
857 | char *tname = name; |
---|
858 | |
---|
859 | /* Disregard prefix _, __ or __x. */ |
---|
860 | if (name[0] == '_') |
---|
861 | { |
---|
862 | if (name[1] == '_' && name[2] == 'x') |
---|
863 | tname += 3; |
---|
864 | else if (name[1] == '_') |
---|
865 | tname += 2; |
---|
866 | else |
---|
867 | tname += 1; |
---|
868 | } |
---|
869 | |
---|
870 | if (tname[0] == 's') |
---|
871 | { |
---|
872 | returns_twice |
---|
873 | = ((tname[1] == 'e' |
---|
874 | && (! strcmp (tname, "setjmp") |
---|
875 | || ! strcmp (tname, "setjmp_syscall"))) |
---|
876 | || (tname[1] == 'i' |
---|
877 | && ! strcmp (tname, "sigsetjmp")) |
---|
878 | || (tname[1] == 'a' |
---|
879 | && ! strcmp (tname, "savectx"))); |
---|
880 | if (tname[1] == 'i' |
---|
881 | && ! strcmp (tname, "siglongjmp")) |
---|
882 | is_longjmp = 1; |
---|
883 | } |
---|
884 | else if ((tname[0] == 'q' && tname[1] == 's' |
---|
885 | && ! strcmp (tname, "qsetjmp")) |
---|
886 | || (tname[0] == 'v' && tname[1] == 'f' |
---|
887 | && ! strcmp (tname, "vfork"))) |
---|
888 | returns_twice = 1; |
---|
889 | |
---|
890 | else if (tname[0] == 'l' && tname[1] == 'o' |
---|
891 | && ! strcmp (tname, "longjmp")) |
---|
892 | is_longjmp = 1; |
---|
893 | } |
---|
894 | |
---|
895 | if (may_be_alloca) |
---|
896 | current_function_calls_alloca = 1; |
---|
897 | |
---|
898 | /* Don't let pending stack adjusts add up to too much. |
---|
899 | Also, do all pending adjustments now |
---|
900 | if there is any chance this might be a call to alloca. */ |
---|
901 | |
---|
902 | if (pending_stack_adjust >= 32 |
---|
903 | || (pending_stack_adjust > 0 && may_be_alloca)) |
---|
904 | do_pending_stack_adjust (); |
---|
905 | |
---|
906 | /* Operand 0 is a pointer-to-function; get the type of the function. */ |
---|
907 | funtype = TREE_TYPE (TREE_OPERAND (exp, 0)); |
---|
908 | if (TREE_CODE (funtype) != POINTER_TYPE) |
---|
909 | abort (); |
---|
910 | funtype = TREE_TYPE (funtype); |
---|
911 | |
---|
912 | /* Push the temporary stack slot level so that we can free any temporaries |
---|
913 | we make. */ |
---|
914 | push_temp_slots (); |
---|
915 | |
---|
916 | /* Start updating where the next arg would go. */ |
---|
917 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX); |
---|
918 | |
---|
919 | /* If struct_value_rtx is 0, it means pass the address |
---|
920 | as if it were an extra parameter. */ |
---|
921 | if (structure_value_addr && struct_value_rtx == 0) |
---|
922 | { |
---|
923 | /* If structure_value_addr is a REG other than |
---|
924 | virtual_outgoing_args_rtx, we can use always use it. If it |
---|
925 | is not a REG, we must always copy it into a register. |
---|
926 | If it is virtual_outgoing_args_rtx, we must copy it to another |
---|
927 | register in some cases. */ |
---|
928 | rtx temp = (GET_CODE (structure_value_addr) != REG |
---|
929 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
930 | || (stack_arg_under_construction |
---|
931 | && structure_value_addr == virtual_outgoing_args_rtx) |
---|
932 | #endif |
---|
933 | ? copy_addr_to_reg (structure_value_addr) |
---|
934 | : structure_value_addr); |
---|
935 | |
---|
936 | actparms |
---|
937 | = tree_cons (error_mark_node, |
---|
938 | make_tree (build_pointer_type (TREE_TYPE (funtype)), |
---|
939 | temp), |
---|
940 | actparms); |
---|
941 | structure_value_addr_parm = 1; |
---|
942 | } |
---|
943 | |
---|
944 | /* Count the arguments and set NUM_ACTUALS. */ |
---|
945 | for (p = actparms, i = 0; p; p = TREE_CHAIN (p)) i++; |
---|
946 | num_actuals = i; |
---|
947 | |
---|
948 | /* Compute number of named args. |
---|
949 | Normally, don't include the last named arg if anonymous args follow. |
---|
950 | We do include the last named arg if STRICT_ARGUMENT_NAMING is defined. |
---|
951 | (If no anonymous args follow, the result of list_length is actually |
---|
952 | one too large. This is harmless.) |
---|
953 | |
---|
954 | If SETUP_INCOMING_VARARGS is defined and STRICT_ARGUMENT_NAMING is not, |
---|
955 | this machine will be able to place unnamed args that were passed in |
---|
956 | registers into the stack. So treat all args as named. This allows the |
---|
957 | insns emitting for a specific argument list to be independent of the |
---|
958 | function declaration. |
---|
959 | |
---|
960 | If SETUP_INCOMING_VARARGS is not defined, we do not have any reliable |
---|
961 | way to pass unnamed args in registers, so we must force them into |
---|
962 | memory. */ |
---|
963 | #if !defined(SETUP_INCOMING_VARARGS) || defined(STRICT_ARGUMENT_NAMING) |
---|
964 | if (TYPE_ARG_TYPES (funtype) != 0) |
---|
965 | n_named_args |
---|
966 | = (list_length (TYPE_ARG_TYPES (funtype)) |
---|
967 | #ifndef STRICT_ARGUMENT_NAMING |
---|
968 | /* Don't include the last named arg. */ |
---|
969 | - 1 |
---|
970 | #endif |
---|
971 | /* Count the struct value address, if it is passed as a parm. */ |
---|
972 | + structure_value_addr_parm); |
---|
973 | else |
---|
974 | #endif |
---|
975 | /* If we know nothing, treat all args as named. */ |
---|
976 | n_named_args = num_actuals; |
---|
977 | |
---|
978 | /* Make a vector to hold all the information about each arg. */ |
---|
979 | args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data)); |
---|
980 | bzero ((char *) args, num_actuals * sizeof (struct arg_data)); |
---|
981 | |
---|
982 | args_size.constant = 0; |
---|
983 | args_size.var = 0; |
---|
984 | |
---|
985 | /* In this loop, we consider args in the order they are written. |
---|
986 | We fill up ARGS from the front or from the back if necessary |
---|
987 | so that in any case the first arg to be pushed ends up at the front. */ |
---|
988 | |
---|
989 | #ifdef PUSH_ARGS_REVERSED |
---|
990 | i = num_actuals - 1, inc = -1; |
---|
991 | /* In this case, must reverse order of args |
---|
992 | so that we compute and push the last arg first. */ |
---|
993 | #else |
---|
994 | i = 0, inc = 1; |
---|
995 | #endif |
---|
996 | |
---|
997 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ |
---|
998 | for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++) |
---|
999 | { |
---|
1000 | tree type = TREE_TYPE (TREE_VALUE (p)); |
---|
1001 | int unsignedp; |
---|
1002 | enum machine_mode mode; |
---|
1003 | |
---|
1004 | args[i].tree_value = TREE_VALUE (p); |
---|
1005 | |
---|
1006 | /* Replace erroneous argument with constant zero. */ |
---|
1007 | if (type == error_mark_node || TYPE_SIZE (type) == 0) |
---|
1008 | args[i].tree_value = integer_zero_node, type = integer_type_node; |
---|
1009 | |
---|
1010 | /* If TYPE is a transparent union, pass things the way we would |
---|
1011 | pass the first field of the union. We have already verified that |
---|
1012 | the modes are the same. */ |
---|
1013 | if (TYPE_TRANSPARENT_UNION (type)) |
---|
1014 | type = TREE_TYPE (TYPE_FIELDS (type)); |
---|
1015 | |
---|
1016 | /* Decide where to pass this arg. |
---|
1017 | |
---|
1018 | args[i].reg is nonzero if all or part is passed in registers. |
---|
1019 | |
---|
1020 | args[i].partial is nonzero if part but not all is passed in registers, |
---|
1021 | and the exact value says how many words are passed in registers. |
---|
1022 | |
---|
1023 | args[i].pass_on_stack is nonzero if the argument must at least be |
---|
1024 | computed on the stack. It may then be loaded back into registers |
---|
1025 | if args[i].reg is nonzero. |
---|
1026 | |
---|
1027 | These decisions are driven by the FUNCTION_... macros and must agree |
---|
1028 | with those made by function.c. */ |
---|
1029 | |
---|
1030 | /* See if this argument should be passed by invisible reference. */ |
---|
1031 | if ((TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST |
---|
1032 | && contains_placeholder_p (TYPE_SIZE (type))) |
---|
1033 | || TREE_ADDRESSABLE (type) |
---|
1034 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE |
---|
1035 | || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, TYPE_MODE (type), |
---|
1036 | type, argpos < n_named_args) |
---|
1037 | #endif |
---|
1038 | ) |
---|
1039 | { |
---|
1040 | #ifdef FUNCTION_ARG_CALLEE_COPIES |
---|
1041 | if (FUNCTION_ARG_CALLEE_COPIES (args_so_far, TYPE_MODE (type), type, |
---|
1042 | argpos < n_named_args) |
---|
1043 | /* If it's in a register, we must make a copy of it too. */ |
---|
1044 | /* ??? Is this a sufficient test? Is there a better one? */ |
---|
1045 | && !(TREE_CODE (args[i].tree_value) == VAR_DECL |
---|
1046 | && REG_P (DECL_RTL (args[i].tree_value))) |
---|
1047 | && ! TREE_ADDRESSABLE (type)) |
---|
1048 | { |
---|
1049 | args[i].tree_value = build1 (ADDR_EXPR, |
---|
1050 | build_pointer_type (type), |
---|
1051 | args[i].tree_value); |
---|
1052 | type = build_pointer_type (type); |
---|
1053 | } |
---|
1054 | else |
---|
1055 | #endif |
---|
1056 | { |
---|
1057 | /* We make a copy of the object and pass the address to the |
---|
1058 | function being called. */ |
---|
1059 | rtx copy; |
---|
1060 | |
---|
1061 | if (TYPE_SIZE (type) == 0 |
---|
1062 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) |
---|
1063 | { |
---|
1064 | /* This is a variable-sized object. Make space on the stack |
---|
1065 | for it. */ |
---|
1066 | rtx size_rtx = expr_size (TREE_VALUE (p)); |
---|
1067 | |
---|
1068 | if (old_stack_level == 0) |
---|
1069 | { |
---|
1070 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
---|
1071 | old_pending_adj = pending_stack_adjust; |
---|
1072 | pending_stack_adjust = 0; |
---|
1073 | } |
---|
1074 | |
---|
1075 | copy = gen_rtx (MEM, BLKmode, |
---|
1076 | allocate_dynamic_stack_space (size_rtx, |
---|
1077 | NULL_RTX, |
---|
1078 | TYPE_ALIGN (type))); |
---|
1079 | } |
---|
1080 | else |
---|
1081 | { |
---|
1082 | int size = int_size_in_bytes (type); |
---|
1083 | copy = assign_stack_temp (TYPE_MODE (type), size, 0); |
---|
1084 | } |
---|
1085 | |
---|
1086 | MEM_IN_STRUCT_P (copy) = AGGREGATE_TYPE_P (type); |
---|
1087 | |
---|
1088 | store_expr (args[i].tree_value, copy, 0); |
---|
1089 | |
---|
1090 | args[i].tree_value = build1 (ADDR_EXPR, |
---|
1091 | build_pointer_type (type), |
---|
1092 | make_tree (type, copy)); |
---|
1093 | type = build_pointer_type (type); |
---|
1094 | } |
---|
1095 | } |
---|
1096 | |
---|
1097 | mode = TYPE_MODE (type); |
---|
1098 | unsignedp = TREE_UNSIGNED (type); |
---|
1099 | |
---|
1100 | #ifdef PROMOTE_FUNCTION_ARGS |
---|
1101 | mode = promote_mode (type, mode, &unsignedp, 1); |
---|
1102 | #endif |
---|
1103 | |
---|
1104 | args[i].unsignedp = unsignedp; |
---|
1105 | args[i].mode = mode; |
---|
1106 | args[i].reg = FUNCTION_ARG (args_so_far, mode, type, |
---|
1107 | argpos < n_named_args); |
---|
1108 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
---|
1109 | if (args[i].reg) |
---|
1110 | args[i].partial |
---|
1111 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, type, |
---|
1112 | argpos < n_named_args); |
---|
1113 | #endif |
---|
1114 | |
---|
1115 | args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type); |
---|
1116 | |
---|
1117 | /* If FUNCTION_ARG returned an (expr_list (nil) FOO), it means that |
---|
1118 | we are to pass this arg in the register(s) designated by FOO, but |
---|
1119 | also to pass it in the stack. */ |
---|
1120 | if (args[i].reg && GET_CODE (args[i].reg) == EXPR_LIST |
---|
1121 | && XEXP (args[i].reg, 0) == 0) |
---|
1122 | args[i].pass_on_stack = 1, args[i].reg = XEXP (args[i].reg, 1); |
---|
1123 | |
---|
1124 | /* If this is an addressable type, we must preallocate the stack |
---|
1125 | since we must evaluate the object into its final location. |
---|
1126 | |
---|
1127 | If this is to be passed in both registers and the stack, it is simpler |
---|
1128 | to preallocate. */ |
---|
1129 | if (TREE_ADDRESSABLE (type) |
---|
1130 | || (args[i].pass_on_stack && args[i].reg != 0)) |
---|
1131 | must_preallocate = 1; |
---|
1132 | |
---|
1133 | /* If this is an addressable type, we cannot pre-evaluate it. Thus, |
---|
1134 | we cannot consider this function call constant. */ |
---|
1135 | if (TREE_ADDRESSABLE (type)) |
---|
1136 | is_const = 0; |
---|
1137 | |
---|
1138 | /* Compute the stack-size of this argument. */ |
---|
1139 | if (args[i].reg == 0 || args[i].partial != 0 |
---|
1140 | #ifdef REG_PARM_STACK_SPACE |
---|
1141 | || reg_parm_stack_space > 0 |
---|
1142 | #endif |
---|
1143 | || args[i].pass_on_stack) |
---|
1144 | locate_and_pad_parm (mode, type, |
---|
1145 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
---|
1146 | 1, |
---|
1147 | #else |
---|
1148 | args[i].reg != 0, |
---|
1149 | #endif |
---|
1150 | fndecl, &args_size, &args[i].offset, |
---|
1151 | &args[i].size); |
---|
1152 | |
---|
1153 | #ifndef ARGS_GROW_DOWNWARD |
---|
1154 | args[i].slot_offset = args_size; |
---|
1155 | #endif |
---|
1156 | |
---|
1157 | #ifndef REG_PARM_STACK_SPACE |
---|
1158 | /* If a part of the arg was put into registers, |
---|
1159 | don't include that part in the amount pushed. */ |
---|
1160 | if (! args[i].pass_on_stack) |
---|
1161 | args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD) |
---|
1162 | / (PARM_BOUNDARY / BITS_PER_UNIT) |
---|
1163 | * (PARM_BOUNDARY / BITS_PER_UNIT)); |
---|
1164 | #endif |
---|
1165 | |
---|
1166 | /* Update ARGS_SIZE, the total stack space for args so far. */ |
---|
1167 | |
---|
1168 | args_size.constant += args[i].size.constant; |
---|
1169 | if (args[i].size.var) |
---|
1170 | { |
---|
1171 | ADD_PARM_SIZE (args_size, args[i].size.var); |
---|
1172 | } |
---|
1173 | |
---|
1174 | /* Since the slot offset points to the bottom of the slot, |
---|
1175 | we must record it after incrementing if the args grow down. */ |
---|
1176 | #ifdef ARGS_GROW_DOWNWARD |
---|
1177 | args[i].slot_offset = args_size; |
---|
1178 | |
---|
1179 | args[i].slot_offset.constant = -args_size.constant; |
---|
1180 | if (args_size.var) |
---|
1181 | { |
---|
1182 | SUB_PARM_SIZE (args[i].slot_offset, args_size.var); |
---|
1183 | } |
---|
1184 | #endif |
---|
1185 | |
---|
1186 | /* Increment ARGS_SO_FAR, which has info about which arg-registers |
---|
1187 | have been used, etc. */ |
---|
1188 | |
---|
1189 | FUNCTION_ARG_ADVANCE (args_so_far, TYPE_MODE (type), type, |
---|
1190 | argpos < n_named_args); |
---|
1191 | } |
---|
1192 | |
---|
1193 | #ifdef FINAL_REG_PARM_STACK_SPACE |
---|
1194 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, |
---|
1195 | args_size.var); |
---|
1196 | #endif |
---|
1197 | |
---|
1198 | /* Compute the actual size of the argument block required. The variable |
---|
1199 | and constant sizes must be combined, the size may have to be rounded, |
---|
1200 | and there may be a minimum required size. */ |
---|
1201 | |
---|
1202 | original_args_size = args_size; |
---|
1203 | if (args_size.var) |
---|
1204 | { |
---|
1205 | /* If this function requires a variable-sized argument list, don't try to |
---|
1206 | make a cse'able block for this call. We may be able to do this |
---|
1207 | eventually, but it is too complicated to keep track of what insns go |
---|
1208 | in the cse'able block and which don't. */ |
---|
1209 | |
---|
1210 | is_const = 0; |
---|
1211 | must_preallocate = 1; |
---|
1212 | |
---|
1213 | args_size.var = ARGS_SIZE_TREE (args_size); |
---|
1214 | args_size.constant = 0; |
---|
1215 | |
---|
1216 | #ifdef STACK_BOUNDARY |
---|
1217 | if (STACK_BOUNDARY != BITS_PER_UNIT) |
---|
1218 | args_size.var = round_up (args_size.var, STACK_BYTES); |
---|
1219 | #endif |
---|
1220 | |
---|
1221 | #ifdef REG_PARM_STACK_SPACE |
---|
1222 | if (reg_parm_stack_space > 0) |
---|
1223 | { |
---|
1224 | args_size.var |
---|
1225 | = size_binop (MAX_EXPR, args_size.var, |
---|
1226 | size_int (REG_PARM_STACK_SPACE (fndecl))); |
---|
1227 | |
---|
1228 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
---|
1229 | /* The area corresponding to register parameters is not to count in |
---|
1230 | the size of the block we need. So make the adjustment. */ |
---|
1231 | args_size.var |
---|
1232 | = size_binop (MINUS_EXPR, args_size.var, |
---|
1233 | size_int (reg_parm_stack_space)); |
---|
1234 | #endif |
---|
1235 | } |
---|
1236 | #endif |
---|
1237 | } |
---|
1238 | else |
---|
1239 | { |
---|
1240 | #ifdef STACK_BOUNDARY |
---|
1241 | args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) |
---|
1242 | / STACK_BYTES) * STACK_BYTES); |
---|
1243 | #endif |
---|
1244 | |
---|
1245 | #ifdef REG_PARM_STACK_SPACE |
---|
1246 | args_size.constant = MAX (args_size.constant, |
---|
1247 | reg_parm_stack_space); |
---|
1248 | #ifdef MAYBE_REG_PARM_STACK_SPACE |
---|
1249 | if (reg_parm_stack_space == 0) |
---|
1250 | args_size.constant = 0; |
---|
1251 | #endif |
---|
1252 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
---|
1253 | args_size.constant -= reg_parm_stack_space; |
---|
1254 | #endif |
---|
1255 | #endif |
---|
1256 | } |
---|
1257 | |
---|
1258 | /* See if we have or want to preallocate stack space. |
---|
1259 | |
---|
1260 | If we would have to push a partially-in-regs parm |
---|
1261 | before other stack parms, preallocate stack space instead. |
---|
1262 | |
---|
1263 | If the size of some parm is not a multiple of the required stack |
---|
1264 | alignment, we must preallocate. |
---|
1265 | |
---|
1266 | If the total size of arguments that would otherwise create a copy in |
---|
1267 | a temporary (such as a CALL) is more than half the total argument list |
---|
1268 | size, preallocation is faster. |
---|
1269 | |
---|
1270 | Another reason to preallocate is if we have a machine (like the m88k) |
---|
1271 | where stack alignment is required to be maintained between every |
---|
1272 | pair of insns, not just when the call is made. However, we assume here |
---|
1273 | that such machines either do not have push insns (and hence preallocation |
---|
1274 | would occur anyway) or the problem is taken care of with |
---|
1275 | PUSH_ROUNDING. */ |
---|
1276 | |
---|
1277 | if (! must_preallocate) |
---|
1278 | { |
---|
1279 | int partial_seen = 0; |
---|
1280 | int copy_to_evaluate_size = 0; |
---|
1281 | |
---|
1282 | for (i = 0; i < num_actuals && ! must_preallocate; i++) |
---|
1283 | { |
---|
1284 | if (args[i].partial > 0 && ! args[i].pass_on_stack) |
---|
1285 | partial_seen = 1; |
---|
1286 | else if (partial_seen && args[i].reg == 0) |
---|
1287 | must_preallocate = 1; |
---|
1288 | |
---|
1289 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode |
---|
1290 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR |
---|
1291 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR |
---|
1292 | || TREE_CODE (args[i].tree_value) == COND_EXPR |
---|
1293 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) |
---|
1294 | copy_to_evaluate_size |
---|
1295 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); |
---|
1296 | } |
---|
1297 | |
---|
1298 | if (copy_to_evaluate_size * 2 >= args_size.constant |
---|
1299 | && args_size.constant > 0) |
---|
1300 | must_preallocate = 1; |
---|
1301 | } |
---|
1302 | |
---|
1303 | /* If the structure value address will reference the stack pointer, we must |
---|
1304 | stabilize it. We don't need to do this if we know that we are not going |
---|
1305 | to adjust the stack pointer in processing this call. */ |
---|
1306 | |
---|
1307 | if (structure_value_addr |
---|
1308 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) |
---|
1309 | || reg_mentioned_p (virtual_outgoing_args_rtx, structure_value_addr)) |
---|
1310 | && (args_size.var |
---|
1311 | #ifndef ACCUMULATE_OUTGOING_ARGS |
---|
1312 | || args_size.constant |
---|
1313 | #endif |
---|
1314 | )) |
---|
1315 | structure_value_addr = copy_to_reg (structure_value_addr); |
---|
1316 | |
---|
1317 | /* If this function call is cse'able, precompute all the parameters. |
---|
1318 | Note that if the parameter is constructed into a temporary, this will |
---|
1319 | cause an additional copy because the parameter will be constructed |
---|
1320 | into a temporary location and then copied into the outgoing arguments. |
---|
1321 | If a parameter contains a call to alloca and this function uses the |
---|
1322 | stack, precompute the parameter. */ |
---|
1323 | |
---|
1324 | /* If we preallocated the stack space, and some arguments must be passed |
---|
1325 | on the stack, then we must precompute any parameter which contains a |
---|
1326 | function call which will store arguments on the stack. |
---|
1327 | Otherwise, evaluating the parameter may clobber previous parameters |
---|
1328 | which have already been stored into the stack. */ |
---|
1329 | |
---|
1330 | for (i = 0; i < num_actuals; i++) |
---|
1331 | if (is_const |
---|
1332 | || ((args_size.var != 0 || args_size.constant != 0) |
---|
1333 | && calls_function (args[i].tree_value, 1)) |
---|
1334 | || (must_preallocate && (args_size.var != 0 || args_size.constant != 0) |
---|
1335 | && calls_function (args[i].tree_value, 0))) |
---|
1336 | { |
---|
1337 | /* If this is an addressable type, we cannot pre-evaluate it. */ |
---|
1338 | if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))) |
---|
1339 | abort (); |
---|
1340 | |
---|
1341 | push_temp_slots (); |
---|
1342 | |
---|
1343 | args[i].initial_value = args[i].value |
---|
1344 | = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0); |
---|
1345 | |
---|
1346 | preserve_temp_slots (args[i].value); |
---|
1347 | pop_temp_slots (); |
---|
1348 | |
---|
1349 | /* ANSI doesn't require a sequence point here, |
---|
1350 | but PCC has one, so this will avoid some problems. */ |
---|
1351 | emit_queue (); |
---|
1352 | |
---|
1353 | args[i].initial_value = args[i].value |
---|
1354 | = protect_from_queue (args[i].initial_value, 0); |
---|
1355 | |
---|
1356 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) != args[i].mode) |
---|
1357 | args[i].value |
---|
1358 | = convert_modes (args[i].mode, |
---|
1359 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), |
---|
1360 | args[i].value, args[i].unsignedp); |
---|
1361 | } |
---|
1362 | |
---|
1363 | /* Now we are about to start emitting insns that can be deleted |
---|
1364 | if a libcall is deleted. */ |
---|
1365 | if (is_const) |
---|
1366 | start_sequence (); |
---|
1367 | |
---|
1368 | /* If we have no actual push instructions, or shouldn't use them, |
---|
1369 | make space for all args right now. */ |
---|
1370 | |
---|
1371 | if (args_size.var != 0) |
---|
1372 | { |
---|
1373 | if (old_stack_level == 0) |
---|
1374 | { |
---|
1375 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
---|
1376 | old_pending_adj = pending_stack_adjust; |
---|
1377 | pending_stack_adjust = 0; |
---|
1378 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
1379 | /* stack_arg_under_construction says whether a stack arg is |
---|
1380 | being constructed at the old stack level. Pushing the stack |
---|
1381 | gets a clean outgoing argument block. */ |
---|
1382 | old_stack_arg_under_construction = stack_arg_under_construction; |
---|
1383 | stack_arg_under_construction = 0; |
---|
1384 | #endif |
---|
1385 | } |
---|
1386 | argblock = push_block (ARGS_SIZE_RTX (args_size), 0, 0); |
---|
1387 | } |
---|
1388 | else |
---|
1389 | { |
---|
1390 | /* Note that we must go through the motions of allocating an argument |
---|
1391 | block even if the size is zero because we may be storing args |
---|
1392 | in the area reserved for register arguments, which may be part of |
---|
1393 | the stack frame. */ |
---|
1394 | |
---|
1395 | int needed = args_size.constant; |
---|
1396 | |
---|
1397 | /* Store the maximum argument space used. It will be pushed by the |
---|
1398 | prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow checking). */ |
---|
1399 | |
---|
1400 | if (needed > current_function_outgoing_args_size) |
---|
1401 | current_function_outgoing_args_size = needed; |
---|
1402 | |
---|
1403 | if (must_preallocate) |
---|
1404 | { |
---|
1405 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
1406 | /* Since the stack pointer will never be pushed, it is possible for |
---|
1407 | the evaluation of a parm to clobber something we have already |
---|
1408 | written to the stack. Since most function calls on RISC machines |
---|
1409 | do not use the stack, this is uncommon, but must work correctly. |
---|
1410 | |
---|
1411 | Therefore, we save any area of the stack that was already written |
---|
1412 | and that we are using. Here we set up to do this by making a new |
---|
1413 | stack usage map from the old one. The actual save will be done |
---|
1414 | by store_one_arg. |
---|
1415 | |
---|
1416 | Another approach might be to try to reorder the argument |
---|
1417 | evaluations to avoid this conflicting stack usage. */ |
---|
1418 | |
---|
1419 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) |
---|
1420 | /* Since we will be writing into the entire argument area, the |
---|
1421 | map must be allocated for its entire size, not just the part that |
---|
1422 | is the responsibility of the caller. */ |
---|
1423 | needed += reg_parm_stack_space; |
---|
1424 | #endif |
---|
1425 | |
---|
1426 | #ifdef ARGS_GROW_DOWNWARD |
---|
1427 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
---|
1428 | needed + 1); |
---|
1429 | #else |
---|
1430 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
---|
1431 | needed); |
---|
1432 | #endif |
---|
1433 | stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use); |
---|
1434 | |
---|
1435 | if (initial_highest_arg_in_use) |
---|
1436 | bcopy (initial_stack_usage_map, stack_usage_map, |
---|
1437 | initial_highest_arg_in_use); |
---|
1438 | |
---|
1439 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
---|
1440 | bzero (&stack_usage_map[initial_highest_arg_in_use], |
---|
1441 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); |
---|
1442 | needed = 0; |
---|
1443 | |
---|
1444 | /* The address of the outgoing argument list must not be copied to a |
---|
1445 | register here, because argblock would be left pointing to the |
---|
1446 | wrong place after the call to allocate_dynamic_stack_space below. |
---|
1447 | */ |
---|
1448 | |
---|
1449 | argblock = virtual_outgoing_args_rtx; |
---|
1450 | |
---|
1451 | #else /* not ACCUMULATE_OUTGOING_ARGS */ |
---|
1452 | if (inhibit_defer_pop == 0) |
---|
1453 | { |
---|
1454 | /* Try to reuse some or all of the pending_stack_adjust |
---|
1455 | to get this space. Maybe we can avoid any pushing. */ |
---|
1456 | if (needed > pending_stack_adjust) |
---|
1457 | { |
---|
1458 | needed -= pending_stack_adjust; |
---|
1459 | pending_stack_adjust = 0; |
---|
1460 | } |
---|
1461 | else |
---|
1462 | { |
---|
1463 | pending_stack_adjust -= needed; |
---|
1464 | needed = 0; |
---|
1465 | } |
---|
1466 | } |
---|
1467 | /* Special case this because overhead of `push_block' in this |
---|
1468 | case is non-trivial. */ |
---|
1469 | if (needed == 0) |
---|
1470 | argblock = virtual_outgoing_args_rtx; |
---|
1471 | else |
---|
1472 | argblock = push_block (GEN_INT (needed), 0, 0); |
---|
1473 | |
---|
1474 | /* We only really need to call `copy_to_reg' in the case where push |
---|
1475 | insns are going to be used to pass ARGBLOCK to a function |
---|
1476 | call in ARGS. In that case, the stack pointer changes value |
---|
1477 | from the allocation point to the call point, and hence |
---|
1478 | the value of VIRTUAL_OUTGOING_ARGS_RTX changes as well. |
---|
1479 | But might as well always do it. */ |
---|
1480 | argblock = copy_to_reg (argblock); |
---|
1481 | #endif /* not ACCUMULATE_OUTGOING_ARGS */ |
---|
1482 | } |
---|
1483 | } |
---|
1484 | |
---|
1485 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
1486 | /* The save/restore code in store_one_arg handles all cases except one: |
---|
1487 | a constructor call (including a C function returning a BLKmode struct) |
---|
1488 | to initialize an argument. */ |
---|
1489 | if (stack_arg_under_construction) |
---|
1490 | { |
---|
1491 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) |
---|
1492 | rtx push_size = GEN_INT (reg_parm_stack_space + args_size.constant); |
---|
1493 | #else |
---|
1494 | rtx push_size = GEN_INT (args_size.constant); |
---|
1495 | #endif |
---|
1496 | if (old_stack_level == 0) |
---|
1497 | { |
---|
1498 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); |
---|
1499 | old_pending_adj = pending_stack_adjust; |
---|
1500 | pending_stack_adjust = 0; |
---|
1501 | /* stack_arg_under_construction says whether a stack arg is |
---|
1502 | being constructed at the old stack level. Pushing the stack |
---|
1503 | gets a clean outgoing argument block. */ |
---|
1504 | old_stack_arg_under_construction = stack_arg_under_construction; |
---|
1505 | stack_arg_under_construction = 0; |
---|
1506 | /* Make a new map for the new argument list. */ |
---|
1507 | stack_usage_map = (char *)alloca (highest_outgoing_arg_in_use); |
---|
1508 | bzero (stack_usage_map, highest_outgoing_arg_in_use); |
---|
1509 | highest_outgoing_arg_in_use = 0; |
---|
1510 | } |
---|
1511 | allocate_dynamic_stack_space (push_size, NULL_RTX, BITS_PER_UNIT); |
---|
1512 | } |
---|
1513 | /* If argument evaluation might modify the stack pointer, copy the |
---|
1514 | address of the argument list to a register. */ |
---|
1515 | for (i = 0; i < num_actuals; i++) |
---|
1516 | if (args[i].pass_on_stack) |
---|
1517 | { |
---|
1518 | argblock = copy_addr_to_reg (argblock); |
---|
1519 | break; |
---|
1520 | } |
---|
1521 | #endif |
---|
1522 | |
---|
1523 | |
---|
1524 | /* If we preallocated stack space, compute the address of each argument. |
---|
1525 | We need not ensure it is a valid memory address here; it will be |
---|
1526 | validized when it is used. */ |
---|
1527 | if (argblock) |
---|
1528 | { |
---|
1529 | rtx arg_reg = argblock; |
---|
1530 | int arg_offset = 0; |
---|
1531 | |
---|
1532 | if (GET_CODE (argblock) == PLUS) |
---|
1533 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); |
---|
1534 | |
---|
1535 | for (i = 0; i < num_actuals; i++) |
---|
1536 | { |
---|
1537 | rtx offset = ARGS_SIZE_RTX (args[i].offset); |
---|
1538 | rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset); |
---|
1539 | rtx addr; |
---|
1540 | |
---|
1541 | /* Skip this parm if it will not be passed on the stack. */ |
---|
1542 | if (! args[i].pass_on_stack && args[i].reg != 0) |
---|
1543 | continue; |
---|
1544 | |
---|
1545 | if (GET_CODE (offset) == CONST_INT) |
---|
1546 | addr = plus_constant (arg_reg, INTVAL (offset)); |
---|
1547 | else |
---|
1548 | addr = gen_rtx (PLUS, Pmode, arg_reg, offset); |
---|
1549 | |
---|
1550 | addr = plus_constant (addr, arg_offset); |
---|
1551 | args[i].stack = gen_rtx (MEM, args[i].mode, addr); |
---|
1552 | MEM_IN_STRUCT_P (args[i].stack) |
---|
1553 | = AGGREGATE_TYPE_P (TREE_TYPE (args[i].tree_value)); |
---|
1554 | |
---|
1555 | if (GET_CODE (slot_offset) == CONST_INT) |
---|
1556 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); |
---|
1557 | else |
---|
1558 | addr = gen_rtx (PLUS, Pmode, arg_reg, slot_offset); |
---|
1559 | |
---|
1560 | addr = plus_constant (addr, arg_offset); |
---|
1561 | args[i].stack_slot = gen_rtx (MEM, args[i].mode, addr); |
---|
1562 | } |
---|
1563 | } |
---|
1564 | |
---|
1565 | #ifdef PUSH_ARGS_REVERSED |
---|
1566 | #ifdef STACK_BOUNDARY |
---|
1567 | /* If we push args individually in reverse order, perform stack alignment |
---|
1568 | before the first push (the last arg). */ |
---|
1569 | if (argblock == 0) |
---|
1570 | anti_adjust_stack (GEN_INT (args_size.constant |
---|
1571 | - original_args_size.constant)); |
---|
1572 | #endif |
---|
1573 | #endif |
---|
1574 | |
---|
1575 | /* Don't try to defer pops if preallocating, not even from the first arg, |
---|
1576 | since ARGBLOCK probably refers to the SP. */ |
---|
1577 | if (argblock) |
---|
1578 | NO_DEFER_POP; |
---|
1579 | |
---|
1580 | /* Get the function to call, in the form of RTL. */ |
---|
1581 | if (fndecl) |
---|
1582 | { |
---|
1583 | /* If this is the first use of the function, see if we need to |
---|
1584 | make an external definition for it. */ |
---|
1585 | if (! TREE_USED (fndecl)) |
---|
1586 | { |
---|
1587 | assemble_external (fndecl); |
---|
1588 | TREE_USED (fndecl) = 1; |
---|
1589 | } |
---|
1590 | |
---|
1591 | /* Get a SYMBOL_REF rtx for the function address. */ |
---|
1592 | funexp = XEXP (DECL_RTL (fndecl), 0); |
---|
1593 | } |
---|
1594 | else |
---|
1595 | /* Generate an rtx (probably a pseudo-register) for the address. */ |
---|
1596 | { |
---|
1597 | push_temp_slots (); |
---|
1598 | funexp = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); |
---|
1599 | pop_temp_slots (); /* FUNEXP can't be BLKmode */ |
---|
1600 | emit_queue (); |
---|
1601 | } |
---|
1602 | |
---|
1603 | /* Figure out the register where the value, if any, will come back. */ |
---|
1604 | valreg = 0; |
---|
1605 | if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode |
---|
1606 | && ! structure_value_addr) |
---|
1607 | { |
---|
1608 | if (pcc_struct_value) |
---|
1609 | valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), |
---|
1610 | fndecl); |
---|
1611 | else |
---|
1612 | valreg = hard_function_value (TREE_TYPE (exp), fndecl); |
---|
1613 | } |
---|
1614 | |
---|
1615 | /* Precompute all register parameters. It isn't safe to compute anything |
---|
1616 | once we have started filling any specific hard regs. */ |
---|
1617 | reg_parm_seen = 0; |
---|
1618 | for (i = 0; i < num_actuals; i++) |
---|
1619 | if (args[i].reg != 0 && ! args[i].pass_on_stack) |
---|
1620 | { |
---|
1621 | reg_parm_seen = 1; |
---|
1622 | |
---|
1623 | if (args[i].value == 0) |
---|
1624 | { |
---|
1625 | push_temp_slots (); |
---|
1626 | args[i].value = expand_expr (args[i].tree_value, NULL_RTX, |
---|
1627 | VOIDmode, 0); |
---|
1628 | preserve_temp_slots (args[i].value); |
---|
1629 | pop_temp_slots (); |
---|
1630 | |
---|
1631 | /* ANSI doesn't require a sequence point here, |
---|
1632 | but PCC has one, so this will avoid some problems. */ |
---|
1633 | emit_queue (); |
---|
1634 | } |
---|
1635 | |
---|
1636 | /* If we are to promote the function arg to a wider mode, |
---|
1637 | do it now. */ |
---|
1638 | |
---|
1639 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) |
---|
1640 | args[i].value |
---|
1641 | = convert_modes (args[i].mode, |
---|
1642 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), |
---|
1643 | args[i].value, args[i].unsignedp); |
---|
1644 | |
---|
1645 | /* If the value is expensive, and we are inside an appropriately |
---|
1646 | short loop, put the value into a pseudo and then put the pseudo |
---|
1647 | into the hard reg. |
---|
1648 | |
---|
1649 | For small register classes, also do this if this call uses |
---|
1650 | register parameters. This is to avoid reload conflicts while |
---|
1651 | loading the parameters registers. */ |
---|
1652 | |
---|
1653 | if ((! (GET_CODE (args[i].value) == REG |
---|
1654 | || (GET_CODE (args[i].value) == SUBREG |
---|
1655 | && GET_CODE (SUBREG_REG (args[i].value)) == REG))) |
---|
1656 | && args[i].mode != BLKmode |
---|
1657 | && rtx_cost (args[i].value, SET) > 2 |
---|
1658 | #ifdef SMALL_REGISTER_CLASSES |
---|
1659 | && (reg_parm_seen || preserve_subexpressions_p ()) |
---|
1660 | #else |
---|
1661 | && preserve_subexpressions_p () |
---|
1662 | #endif |
---|
1663 | ) |
---|
1664 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); |
---|
1665 | } |
---|
1666 | |
---|
1667 | #if defined(ACCUMULATE_OUTGOING_ARGS) && defined(REG_PARM_STACK_SPACE) |
---|
1668 | /* The argument list is the property of the called routine and it |
---|
1669 | may clobber it. If the fixed area has been used for previous |
---|
1670 | parameters, we must save and restore it. |
---|
1671 | |
---|
1672 | Here we compute the boundary of the that needs to be saved, if any. */ |
---|
1673 | |
---|
1674 | #ifdef ARGS_GROW_DOWNWARD |
---|
1675 | for (i = 0; i < reg_parm_stack_space + 1; i++) |
---|
1676 | #else |
---|
1677 | for (i = 0; i < reg_parm_stack_space; i++) |
---|
1678 | #endif |
---|
1679 | { |
---|
1680 | if (i >= highest_outgoing_arg_in_use |
---|
1681 | || stack_usage_map[i] == 0) |
---|
1682 | continue; |
---|
1683 | |
---|
1684 | if (low_to_save == -1) |
---|
1685 | low_to_save = i; |
---|
1686 | |
---|
1687 | high_to_save = i; |
---|
1688 | } |
---|
1689 | |
---|
1690 | if (low_to_save >= 0) |
---|
1691 | { |
---|
1692 | int num_to_save = high_to_save - low_to_save + 1; |
---|
1693 | enum machine_mode save_mode |
---|
1694 | = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); |
---|
1695 | rtx stack_area; |
---|
1696 | |
---|
1697 | /* If we don't have the required alignment, must do this in BLKmode. */ |
---|
1698 | if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode), |
---|
1699 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) |
---|
1700 | save_mode = BLKmode; |
---|
1701 | |
---|
1702 | stack_area = gen_rtx (MEM, save_mode, |
---|
1703 | memory_address (save_mode, |
---|
1704 | |
---|
1705 | #ifdef ARGS_GROW_DOWNWARD |
---|
1706 | plus_constant (argblock, |
---|
1707 | - high_to_save) |
---|
1708 | #else |
---|
1709 | plus_constant (argblock, |
---|
1710 | low_to_save) |
---|
1711 | #endif |
---|
1712 | )); |
---|
1713 | if (save_mode == BLKmode) |
---|
1714 | { |
---|
1715 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); |
---|
1716 | MEM_IN_STRUCT_P (save_area) = 0; |
---|
1717 | emit_block_move (validize_mem (save_area), stack_area, |
---|
1718 | GEN_INT (num_to_save), |
---|
1719 | PARM_BOUNDARY / BITS_PER_UNIT); |
---|
1720 | } |
---|
1721 | else |
---|
1722 | { |
---|
1723 | save_area = gen_reg_rtx (save_mode); |
---|
1724 | emit_move_insn (save_area, stack_area); |
---|
1725 | } |
---|
1726 | } |
---|
1727 | #endif |
---|
1728 | |
---|
1729 | |
---|
1730 | /* Now store (and compute if necessary) all non-register parms. |
---|
1731 | These come before register parms, since they can require block-moves, |
---|
1732 | which could clobber the registers used for register parms. |
---|
1733 | Parms which have partial registers are not stored here, |
---|
1734 | but we do preallocate space here if they want that. */ |
---|
1735 | |
---|
1736 | for (i = 0; i < num_actuals; i++) |
---|
1737 | if (args[i].reg == 0 || args[i].pass_on_stack) |
---|
1738 | store_one_arg (&args[i], argblock, may_be_alloca, |
---|
1739 | args_size.var != 0, fndecl, reg_parm_stack_space); |
---|
1740 | |
---|
1741 | #ifdef STRICT_ALIGNMENT |
---|
1742 | /* If we have a parm that is passed in registers but not in memory |
---|
1743 | and whose alignment does not permit a direct copy into registers, |
---|
1744 | make a group of pseudos that correspond to each register that we |
---|
1745 | will later fill. */ |
---|
1746 | |
---|
1747 | for (i = 0; i < num_actuals; i++) |
---|
1748 | if (args[i].reg != 0 && ! args[i].pass_on_stack |
---|
1749 | && args[i].mode == BLKmode |
---|
1750 | && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) |
---|
1751 | < MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) |
---|
1752 | { |
---|
1753 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); |
---|
1754 | int big_endian_correction = 0; |
---|
1755 | |
---|
1756 | args[i].n_aligned_regs |
---|
1757 | = args[i].partial ? args[i].partial |
---|
1758 | : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; |
---|
1759 | |
---|
1760 | args[i].aligned_regs = (rtx *) alloca (sizeof (rtx) |
---|
1761 | * args[i].n_aligned_regs); |
---|
1762 | |
---|
1763 | /* Structures smaller than a word are aligned to the least significant |
---|
1764 | byte (to the right). On a BYTES_BIG_ENDIAN machine, this means we |
---|
1765 | must skip the empty high order bytes when calculating the bit |
---|
1766 | offset. */ |
---|
1767 | if (BYTES_BIG_ENDIAN && bytes < UNITS_PER_WORD) |
---|
1768 | big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT)); |
---|
1769 | |
---|
1770 | for (j = 0; j < args[i].n_aligned_regs; j++) |
---|
1771 | { |
---|
1772 | rtx reg = gen_reg_rtx (word_mode); |
---|
1773 | rtx word = operand_subword_force (args[i].value, j, BLKmode); |
---|
1774 | int bitsize = TYPE_ALIGN (TREE_TYPE (args[i].tree_value)); |
---|
1775 | int bitpos; |
---|
1776 | |
---|
1777 | args[i].aligned_regs[j] = reg; |
---|
1778 | |
---|
1779 | /* Clobber REG and move each partword into it. Ensure we don't |
---|
1780 | go past the end of the structure. Note that the loop below |
---|
1781 | works because we've already verified that padding |
---|
1782 | and endianness are compatible. */ |
---|
1783 | |
---|
1784 | emit_insn (gen_rtx (CLOBBER, VOIDmode, reg)); |
---|
1785 | |
---|
1786 | for (bitpos = 0; |
---|
1787 | bitpos < BITS_PER_WORD && bytes > 0; |
---|
1788 | bitpos += bitsize, bytes -= bitsize / BITS_PER_UNIT) |
---|
1789 | { |
---|
1790 | int xbitpos = bitpos + big_endian_correction; |
---|
1791 | |
---|
1792 | store_bit_field (reg, bitsize, xbitpos, word_mode, |
---|
1793 | extract_bit_field (word, bitsize, bitpos, 1, |
---|
1794 | NULL_RTX, word_mode, |
---|
1795 | word_mode, |
---|
1796 | bitsize / BITS_PER_UNIT, |
---|
1797 | BITS_PER_WORD), |
---|
1798 | bitsize / BITS_PER_UNIT, BITS_PER_WORD); |
---|
1799 | } |
---|
1800 | } |
---|
1801 | } |
---|
1802 | #endif |
---|
1803 | |
---|
1804 | /* Now store any partially-in-registers parm. |
---|
1805 | This is the last place a block-move can happen. */ |
---|
1806 | if (reg_parm_seen) |
---|
1807 | for (i = 0; i < num_actuals; i++) |
---|
1808 | if (args[i].partial != 0 && ! args[i].pass_on_stack) |
---|
1809 | store_one_arg (&args[i], argblock, may_be_alloca, |
---|
1810 | args_size.var != 0, fndecl, reg_parm_stack_space); |
---|
1811 | |
---|
1812 | #ifndef PUSH_ARGS_REVERSED |
---|
1813 | #ifdef STACK_BOUNDARY |
---|
1814 | /* If we pushed args in forward order, perform stack alignment |
---|
1815 | after pushing the last arg. */ |
---|
1816 | if (argblock == 0) |
---|
1817 | anti_adjust_stack (GEN_INT (args_size.constant |
---|
1818 | - original_args_size.constant)); |
---|
1819 | #endif |
---|
1820 | #endif |
---|
1821 | |
---|
1822 | /* If register arguments require space on the stack and stack space |
---|
1823 | was not preallocated, allocate stack space here for arguments |
---|
1824 | passed in registers. */ |
---|
1825 | #if ! defined(ACCUMULATE_OUTGOING_ARGS) && defined(OUTGOING_REG_PARM_STACK_SPACE) |
---|
1826 | if (must_preallocate == 0 && reg_parm_stack_space > 0) |
---|
1827 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
---|
1828 | #endif |
---|
1829 | |
---|
1830 | /* Pass the function the address in which to return a structure value. */ |
---|
1831 | if (structure_value_addr && ! structure_value_addr_parm) |
---|
1832 | { |
---|
1833 | emit_move_insn (struct_value_rtx, |
---|
1834 | force_reg (Pmode, |
---|
1835 | force_operand (structure_value_addr, |
---|
1836 | NULL_RTX))); |
---|
1837 | if (GET_CODE (struct_value_rtx) == REG) |
---|
1838 | use_reg (&call_fusage, struct_value_rtx); |
---|
1839 | } |
---|
1840 | |
---|
1841 | funexp = prepare_call_address (funexp, fndecl, &call_fusage, reg_parm_seen); |
---|
1842 | |
---|
1843 | /* Now do the register loads required for any wholly-register parms or any |
---|
1844 | parms which are passed both on the stack and in a register. Their |
---|
1845 | expressions were already evaluated. |
---|
1846 | |
---|
1847 | Mark all register-parms as living through the call, putting these USE |
---|
1848 | insns in the CALL_INSN_FUNCTION_USAGE field. */ |
---|
1849 | |
---|
1850 | for (i = 0; i < num_actuals; i++) |
---|
1851 | { |
---|
1852 | rtx list = args[i].reg; |
---|
1853 | int partial = args[i].partial; |
---|
1854 | |
---|
1855 | while (list) |
---|
1856 | { |
---|
1857 | rtx reg; |
---|
1858 | int nregs; |
---|
1859 | |
---|
1860 | /* Process each register that needs to get this arg. */ |
---|
1861 | if (GET_CODE (list) == EXPR_LIST) |
---|
1862 | reg = XEXP (list, 0), list = XEXP (list, 1); |
---|
1863 | else |
---|
1864 | reg = list, list = 0; |
---|
1865 | |
---|
1866 | /* Set to non-negative if must move a word at a time, even if just |
---|
1867 | one word (e.g, partial == 1 && mode == DFmode). Set to -1 if |
---|
1868 | we just use a normal move insn. This value can be zero if the |
---|
1869 | argument is a zero size structure with no fields. */ |
---|
1870 | nregs = (partial ? partial |
---|
1871 | : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode |
---|
1872 | ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value)) |
---|
1873 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) |
---|
1874 | : -1)); |
---|
1875 | |
---|
1876 | /* If simple case, just do move. If normal partial, store_one_arg |
---|
1877 | has already loaded the register for us. In all other cases, |
---|
1878 | load the register(s) from memory. */ |
---|
1879 | |
---|
1880 | if (nregs == -1) |
---|
1881 | emit_move_insn (reg, args[i].value); |
---|
1882 | |
---|
1883 | #ifdef STRICT_ALIGNMENT |
---|
1884 | /* If we have pre-computed the values to put in the registers in |
---|
1885 | the case of non-aligned structures, copy them in now. */ |
---|
1886 | |
---|
1887 | else if (args[i].n_aligned_regs != 0) |
---|
1888 | for (j = 0; j < args[i].n_aligned_regs; j++) |
---|
1889 | emit_move_insn (gen_rtx (REG, word_mode, REGNO (reg) + j), |
---|
1890 | args[i].aligned_regs[j]); |
---|
1891 | #endif |
---|
1892 | |
---|
1893 | else if (args[i].partial == 0 || args[i].pass_on_stack) |
---|
1894 | move_block_to_reg (REGNO (reg), |
---|
1895 | validize_mem (args[i].value), nregs, |
---|
1896 | args[i].mode); |
---|
1897 | |
---|
1898 | if (nregs == -1) |
---|
1899 | use_reg (&call_fusage, reg); |
---|
1900 | else |
---|
1901 | use_regs (&call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs); |
---|
1902 | |
---|
1903 | /* PARTIAL referred only to the first register, so clear it for the |
---|
1904 | next time. */ |
---|
1905 | partial = 0; |
---|
1906 | } |
---|
1907 | } |
---|
1908 | |
---|
1909 | /* Perform postincrements before actually calling the function. */ |
---|
1910 | emit_queue (); |
---|
1911 | |
---|
1912 | /* All arguments and registers used for the call must be set up by now! */ |
---|
1913 | |
---|
1914 | /* Generate the actual call instruction. */ |
---|
1915 | emit_call_1 (funexp, fndecl, funtype, args_size.constant, struct_value_size, |
---|
1916 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), |
---|
1917 | valreg, old_inhibit_defer_pop, call_fusage, is_const); |
---|
1918 | |
---|
1919 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
---|
1920 | Test valreg so we don't crash; may safely ignore `const' |
---|
1921 | if return type is void. */ |
---|
1922 | if (is_const && valreg != 0) |
---|
1923 | { |
---|
1924 | rtx note = 0; |
---|
1925 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); |
---|
1926 | rtx insns; |
---|
1927 | |
---|
1928 | /* Construct an "equal form" for the value which mentions all the |
---|
1929 | arguments in order as well as the function name. */ |
---|
1930 | #ifdef PUSH_ARGS_REVERSED |
---|
1931 | for (i = 0; i < num_actuals; i++) |
---|
1932 | note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note); |
---|
1933 | #else |
---|
1934 | for (i = num_actuals - 1; i >= 0; i--) |
---|
1935 | note = gen_rtx (EXPR_LIST, VOIDmode, args[i].initial_value, note); |
---|
1936 | #endif |
---|
1937 | note = gen_rtx (EXPR_LIST, VOIDmode, funexp, note); |
---|
1938 | |
---|
1939 | insns = get_insns (); |
---|
1940 | end_sequence (); |
---|
1941 | |
---|
1942 | emit_libcall_block (insns, temp, valreg, note); |
---|
1943 | |
---|
1944 | valreg = temp; |
---|
1945 | } |
---|
1946 | else if (is_const) |
---|
1947 | { |
---|
1948 | /* Otherwise, just write out the sequence without a note. */ |
---|
1949 | rtx insns = get_insns (); |
---|
1950 | |
---|
1951 | end_sequence (); |
---|
1952 | emit_insns (insns); |
---|
1953 | } |
---|
1954 | |
---|
1955 | /* For calls to `setjmp', etc., inform flow.c it should complain |
---|
1956 | if nonvolatile values are live. */ |
---|
1957 | |
---|
1958 | if (returns_twice) |
---|
1959 | { |
---|
1960 | emit_note (name, NOTE_INSN_SETJMP); |
---|
1961 | current_function_calls_setjmp = 1; |
---|
1962 | } |
---|
1963 | |
---|
1964 | if (is_longjmp) |
---|
1965 | current_function_calls_longjmp = 1; |
---|
1966 | |
---|
1967 | /* Notice functions that cannot return. |
---|
1968 | If optimizing, insns emitted below will be dead. |
---|
1969 | If not optimizing, they will exist, which is useful |
---|
1970 | if the user uses the `return' command in the debugger. */ |
---|
1971 | |
---|
1972 | if (is_volatile || is_longjmp) |
---|
1973 | emit_barrier (); |
---|
1974 | |
---|
1975 | /* If value type not void, return an rtx for the value. */ |
---|
1976 | |
---|
1977 | /* If there are cleanups to be called, don't use a hard reg as target. */ |
---|
1978 | if (cleanups_this_call != old_cleanups |
---|
1979 | && target && REG_P (target) |
---|
1980 | && REGNO (target) < FIRST_PSEUDO_REGISTER) |
---|
1981 | target = 0; |
---|
1982 | |
---|
1983 | if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode |
---|
1984 | || ignore) |
---|
1985 | { |
---|
1986 | target = const0_rtx; |
---|
1987 | } |
---|
1988 | else if (structure_value_addr) |
---|
1989 | { |
---|
1990 | if (target == 0 || GET_CODE (target) != MEM) |
---|
1991 | { |
---|
1992 | target = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), |
---|
1993 | memory_address (TYPE_MODE (TREE_TYPE (exp)), |
---|
1994 | structure_value_addr)); |
---|
1995 | MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp)); |
---|
1996 | } |
---|
1997 | } |
---|
1998 | else if (pcc_struct_value) |
---|
1999 | { |
---|
2000 | if (target == 0) |
---|
2001 | { |
---|
2002 | /* We used leave the value in the location that it is |
---|
2003 | returned in, but that causes problems if it is used more |
---|
2004 | than once in one expression. Rather than trying to track |
---|
2005 | when a copy is required, we always copy when TARGET is |
---|
2006 | not specified. This calling sequence is only used on |
---|
2007 | a few machines and TARGET is usually nonzero. */ |
---|
2008 | if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) |
---|
2009 | { |
---|
2010 | target = assign_stack_temp (BLKmode, |
---|
2011 | int_size_in_bytes (TREE_TYPE (exp)), |
---|
2012 | 0); |
---|
2013 | |
---|
2014 | MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp)); |
---|
2015 | |
---|
2016 | /* Save this temp slot around the pop below. */ |
---|
2017 | preserve_temp_slots (target); |
---|
2018 | } |
---|
2019 | else |
---|
2020 | target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp))); |
---|
2021 | } |
---|
2022 | |
---|
2023 | if (TYPE_MODE (TREE_TYPE (exp)) != BLKmode) |
---|
2024 | emit_move_insn (target, gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), |
---|
2025 | copy_to_reg (valreg))); |
---|
2026 | else |
---|
2027 | emit_block_move (target, gen_rtx (MEM, BLKmode, copy_to_reg (valreg)), |
---|
2028 | expr_size (exp), |
---|
2029 | TYPE_ALIGN (TREE_TYPE (exp)) / BITS_PER_UNIT); |
---|
2030 | } |
---|
2031 | else if (target && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) |
---|
2032 | && GET_MODE (target) == GET_MODE (valreg)) |
---|
2033 | /* TARGET and VALREG cannot be equal at this point because the latter |
---|
2034 | would not have REG_FUNCTION_VALUE_P true, while the former would if |
---|
2035 | it were referring to the same register. |
---|
2036 | |
---|
2037 | If they refer to the same register, this move will be a no-op, except |
---|
2038 | when function inlining is being done. */ |
---|
2039 | emit_move_insn (target, valreg); |
---|
2040 | else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) |
---|
2041 | { |
---|
2042 | /* Some machines (the PA for example) want to return all small |
---|
2043 | structures in registers regardless of the structure's alignment. |
---|
2044 | |
---|
2045 | Deal with them explicitly by copying from the return registers |
---|
2046 | into the target MEM locations. */ |
---|
2047 | int bytes = int_size_in_bytes (TREE_TYPE (exp)); |
---|
2048 | int n_regs = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; |
---|
2049 | int i; |
---|
2050 | enum machine_mode tmpmode; |
---|
2051 | rtx src, dst; |
---|
2052 | int bitsize = MIN (TYPE_ALIGN (TREE_TYPE (exp)), BITS_PER_WORD); |
---|
2053 | int bitpos, xbitpos, big_endian_correction = 0; |
---|
2054 | |
---|
2055 | if (target == 0) |
---|
2056 | { |
---|
2057 | target = assign_stack_temp (BLKmode, bytes, 0); |
---|
2058 | MEM_IN_STRUCT_P (target) = AGGREGATE_TYPE_P (TREE_TYPE (exp)); |
---|
2059 | preserve_temp_slots (target); |
---|
2060 | } |
---|
2061 | |
---|
2062 | /* This code assumes valreg is at least a full word. If it isn't, |
---|
2063 | copy it into a new pseudo which is a full word. */ |
---|
2064 | if (GET_MODE (valreg) != BLKmode |
---|
2065 | && GET_MODE_SIZE (GET_MODE (valreg)) < UNITS_PER_WORD) |
---|
2066 | valreg = convert_to_mode (SImode, valreg, |
---|
2067 | TREE_UNSIGNED (TREE_TYPE (exp))); |
---|
2068 | |
---|
2069 | /* Structures whose size is not a multiple of a word are aligned |
---|
2070 | to the least significant byte (to the right). On a BYTES_BIG_ENDIAN |
---|
2071 | machine, this means we must skip the empty high order bytes when |
---|
2072 | calculating the bit offset. */ |
---|
2073 | if (BYTES_BIG_ENDIAN && bytes % UNITS_PER_WORD) |
---|
2074 | big_endian_correction = (BITS_PER_WORD - ((bytes % UNITS_PER_WORD) |
---|
2075 | * BITS_PER_UNIT)); |
---|
2076 | |
---|
2077 | /* Copy the structure BITSIZE bites at a time. |
---|
2078 | |
---|
2079 | We could probably emit more efficient code for machines |
---|
2080 | which do not use strict alignment, but it doesn't seem |
---|
2081 | worth the effort at the current time. */ |
---|
2082 | for (bitpos = 0, xbitpos = big_endian_correction; |
---|
2083 | bitpos < bytes * BITS_PER_UNIT; |
---|
2084 | bitpos += bitsize, xbitpos += bitsize) |
---|
2085 | { |
---|
2086 | |
---|
2087 | /* We need a new source operand each time xbitpos is on a |
---|
2088 | word boundary and when xbitpos == big_endian_correction |
---|
2089 | (the first time through). */ |
---|
2090 | if (xbitpos % BITS_PER_WORD == 0 |
---|
2091 | || xbitpos == big_endian_correction) |
---|
2092 | src = operand_subword_force (valreg, |
---|
2093 | xbitpos / BITS_PER_WORD, |
---|
2094 | BLKmode); |
---|
2095 | |
---|
2096 | /* We need a new destination operand each time bitpos is on |
---|
2097 | a word boundary. */ |
---|
2098 | if (bitpos % BITS_PER_WORD == 0) |
---|
2099 | dst = operand_subword (target, bitpos / BITS_PER_WORD, 1, BLKmode); |
---|
2100 | |
---|
2101 | /* Use xbitpos for the source extraction (right justified) and |
---|
2102 | xbitpos for the destination store (left justified). */ |
---|
2103 | store_bit_field (dst, bitsize, bitpos % BITS_PER_WORD, word_mode, |
---|
2104 | extract_bit_field (src, bitsize, |
---|
2105 | xbitpos % BITS_PER_WORD, 1, |
---|
2106 | NULL_RTX, word_mode, |
---|
2107 | word_mode, |
---|
2108 | bitsize / BITS_PER_UNIT, |
---|
2109 | BITS_PER_WORD), |
---|
2110 | bitsize / BITS_PER_UNIT, BITS_PER_WORD); |
---|
2111 | } |
---|
2112 | } |
---|
2113 | else |
---|
2114 | target = copy_to_reg (valreg); |
---|
2115 | |
---|
2116 | #ifdef PROMOTE_FUNCTION_RETURN |
---|
2117 | /* If we promoted this return value, make the proper SUBREG. TARGET |
---|
2118 | might be const0_rtx here, so be careful. */ |
---|
2119 | if (GET_CODE (target) == REG |
---|
2120 | && TYPE_MODE (TREE_TYPE (exp)) != BLKmode |
---|
2121 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) |
---|
2122 | { |
---|
2123 | tree type = TREE_TYPE (exp); |
---|
2124 | int unsignedp = TREE_UNSIGNED (type); |
---|
2125 | |
---|
2126 | /* If we don't promote as expected, something is wrong. */ |
---|
2127 | if (GET_MODE (target) |
---|
2128 | != promote_mode (type, TYPE_MODE (type), &unsignedp, 1)) |
---|
2129 | abort (); |
---|
2130 | |
---|
2131 | target = gen_rtx (SUBREG, TYPE_MODE (type), target, 0); |
---|
2132 | SUBREG_PROMOTED_VAR_P (target) = 1; |
---|
2133 | SUBREG_PROMOTED_UNSIGNED_P (target) = unsignedp; |
---|
2134 | } |
---|
2135 | #endif |
---|
2136 | |
---|
2137 | if (flag_short_temps) |
---|
2138 | { |
---|
2139 | /* Perform all cleanups needed for the arguments of this call |
---|
2140 | (i.e. destructors in C++). */ |
---|
2141 | expand_cleanups_to (old_cleanups); |
---|
2142 | } |
---|
2143 | |
---|
2144 | /* If size of args is variable or this was a constructor call for a stack |
---|
2145 | argument, restore saved stack-pointer value. */ |
---|
2146 | |
---|
2147 | if (old_stack_level) |
---|
2148 | { |
---|
2149 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); |
---|
2150 | pending_stack_adjust = old_pending_adj; |
---|
2151 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
2152 | stack_arg_under_construction = old_stack_arg_under_construction; |
---|
2153 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
---|
2154 | stack_usage_map = initial_stack_usage_map; |
---|
2155 | #endif |
---|
2156 | } |
---|
2157 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
2158 | else |
---|
2159 | { |
---|
2160 | #ifdef REG_PARM_STACK_SPACE |
---|
2161 | if (save_area) |
---|
2162 | { |
---|
2163 | enum machine_mode save_mode = GET_MODE (save_area); |
---|
2164 | rtx stack_area |
---|
2165 | = gen_rtx (MEM, save_mode, |
---|
2166 | memory_address (save_mode, |
---|
2167 | #ifdef ARGS_GROW_DOWNWARD |
---|
2168 | plus_constant (argblock, - high_to_save) |
---|
2169 | #else |
---|
2170 | plus_constant (argblock, low_to_save) |
---|
2171 | #endif |
---|
2172 | )); |
---|
2173 | |
---|
2174 | if (save_mode != BLKmode) |
---|
2175 | emit_move_insn (stack_area, save_area); |
---|
2176 | else |
---|
2177 | emit_block_move (stack_area, validize_mem (save_area), |
---|
2178 | GEN_INT (high_to_save - low_to_save + 1), |
---|
2179 | PARM_BOUNDARY / BITS_PER_UNIT); |
---|
2180 | } |
---|
2181 | #endif |
---|
2182 | |
---|
2183 | /* If we saved any argument areas, restore them. */ |
---|
2184 | for (i = 0; i < num_actuals; i++) |
---|
2185 | if (args[i].save_area) |
---|
2186 | { |
---|
2187 | enum machine_mode save_mode = GET_MODE (args[i].save_area); |
---|
2188 | rtx stack_area |
---|
2189 | = gen_rtx (MEM, save_mode, |
---|
2190 | memory_address (save_mode, |
---|
2191 | XEXP (args[i].stack_slot, 0))); |
---|
2192 | |
---|
2193 | if (save_mode != BLKmode) |
---|
2194 | emit_move_insn (stack_area, args[i].save_area); |
---|
2195 | else |
---|
2196 | emit_block_move (stack_area, validize_mem (args[i].save_area), |
---|
2197 | GEN_INT (args[i].size.constant), |
---|
2198 | PARM_BOUNDARY / BITS_PER_UNIT); |
---|
2199 | } |
---|
2200 | |
---|
2201 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
---|
2202 | stack_usage_map = initial_stack_usage_map; |
---|
2203 | } |
---|
2204 | #endif |
---|
2205 | |
---|
2206 | /* If this was alloca, record the new stack level for nonlocal gotos. |
---|
2207 | Check for the handler slots since we might not have a save area |
---|
2208 | for non-local gotos. */ |
---|
2209 | |
---|
2210 | if (may_be_alloca && nonlocal_goto_handler_slot != 0) |
---|
2211 | emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX); |
---|
2212 | |
---|
2213 | pop_temp_slots (); |
---|
2214 | |
---|
2215 | return target; |
---|
2216 | } |
---|
2217 | |
---|
2218 | /* Output a library call to function FUN (a SYMBOL_REF rtx) |
---|
2219 | (emitting the queue unless NO_QUEUE is nonzero), |
---|
2220 | for a value of mode OUTMODE, |
---|
2221 | with NARGS different arguments, passed as alternating rtx values |
---|
2222 | and machine_modes to convert them to. |
---|
2223 | The rtx values should have been passed through protect_from_queue already. |
---|
2224 | |
---|
2225 | NO_QUEUE will be true if and only if the library call is a `const' call |
---|
2226 | which will be enclosed in REG_LIBCALL/REG_RETVAL notes; it is equivalent |
---|
2227 | to the variable is_const in expand_call. |
---|
2228 | |
---|
2229 | NO_QUEUE must be true for const calls, because if it isn't, then |
---|
2230 | any pending increment will be emitted between REG_LIBCALL/REG_RETVAL notes, |
---|
2231 | and will be lost if the libcall sequence is optimized away. |
---|
2232 | |
---|
2233 | NO_QUEUE must be false for non-const calls, because if it isn't, the |
---|
2234 | call insn will have its CONST_CALL_P bit set, and it will be incorrectly |
---|
2235 | optimized. For instance, the instruction scheduler may incorrectly |
---|
2236 | move memory references across the non-const call. */ |
---|
2237 | |
---|
2238 | void |
---|
2239 | emit_library_call VPROTO((rtx orgfun, int no_queue, enum machine_mode outmode, |
---|
2240 | int nargs, ...)) |
---|
2241 | { |
---|
2242 | #ifndef __STDC__ |
---|
2243 | rtx orgfun; |
---|
2244 | int no_queue; |
---|
2245 | enum machine_mode outmode; |
---|
2246 | int nargs; |
---|
2247 | #endif |
---|
2248 | va_list p; |
---|
2249 | /* Total size in bytes of all the stack-parms scanned so far. */ |
---|
2250 | struct args_size args_size; |
---|
2251 | /* Size of arguments before any adjustments (such as rounding). */ |
---|
2252 | struct args_size original_args_size; |
---|
2253 | register int argnum; |
---|
2254 | rtx fun; |
---|
2255 | int inc; |
---|
2256 | int count; |
---|
2257 | rtx argblock = 0; |
---|
2258 | CUMULATIVE_ARGS args_so_far; |
---|
2259 | struct arg { rtx value; enum machine_mode mode; rtx reg; int partial; |
---|
2260 | struct args_size offset; struct args_size size; }; |
---|
2261 | struct arg *argvec; |
---|
2262 | int old_inhibit_defer_pop = inhibit_defer_pop; |
---|
2263 | rtx call_fusage = 0; |
---|
2264 | /* library calls are never indirect calls. */ |
---|
2265 | int current_call_is_indirect = 0; |
---|
2266 | |
---|
2267 | VA_START (p, nargs); |
---|
2268 | |
---|
2269 | #ifndef __STDC__ |
---|
2270 | orgfun = va_arg (p, rtx); |
---|
2271 | no_queue = va_arg (p, int); |
---|
2272 | outmode = va_arg (p, enum machine_mode); |
---|
2273 | nargs = va_arg (p, int); |
---|
2274 | #endif |
---|
2275 | |
---|
2276 | fun = orgfun; |
---|
2277 | |
---|
2278 | /* Copy all the libcall-arguments out of the varargs data |
---|
2279 | and into a vector ARGVEC. |
---|
2280 | |
---|
2281 | Compute how to pass each argument. We only support a very small subset |
---|
2282 | of the full argument passing conventions to limit complexity here since |
---|
2283 | library functions shouldn't have many args. */ |
---|
2284 | |
---|
2285 | argvec = (struct arg *) alloca (nargs * sizeof (struct arg)); |
---|
2286 | |
---|
2287 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun); |
---|
2288 | |
---|
2289 | args_size.constant = 0; |
---|
2290 | args_size.var = 0; |
---|
2291 | |
---|
2292 | push_temp_slots (); |
---|
2293 | |
---|
2294 | for (count = 0; count < nargs; count++) |
---|
2295 | { |
---|
2296 | rtx val = va_arg (p, rtx); |
---|
2297 | enum machine_mode mode = va_arg (p, enum machine_mode); |
---|
2298 | |
---|
2299 | /* We cannot convert the arg value to the mode the library wants here; |
---|
2300 | must do it earlier where we know the signedness of the arg. */ |
---|
2301 | if (mode == BLKmode |
---|
2302 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) |
---|
2303 | abort (); |
---|
2304 | |
---|
2305 | /* On some machines, there's no way to pass a float to a library fcn. |
---|
2306 | Pass it as a double instead. */ |
---|
2307 | #ifdef LIBGCC_NEEDS_DOUBLE |
---|
2308 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) |
---|
2309 | val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; |
---|
2310 | #endif |
---|
2311 | |
---|
2312 | /* There's no need to call protect_from_queue, because |
---|
2313 | either emit_move_insn or emit_push_insn will do that. */ |
---|
2314 | |
---|
2315 | /* Make sure it is a reasonable operand for a move or push insn. */ |
---|
2316 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM |
---|
2317 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) |
---|
2318 | val = force_operand (val, NULL_RTX); |
---|
2319 | |
---|
2320 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE |
---|
2321 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) |
---|
2322 | { |
---|
2323 | /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can |
---|
2324 | be viewed as just an efficiency improvement. */ |
---|
2325 | rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0); |
---|
2326 | emit_move_insn (slot, val); |
---|
2327 | val = force_operand (XEXP (slot, 0), NULL_RTX); |
---|
2328 | mode = Pmode; |
---|
2329 | } |
---|
2330 | #endif |
---|
2331 | |
---|
2332 | argvec[count].value = val; |
---|
2333 | argvec[count].mode = mode; |
---|
2334 | |
---|
2335 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); |
---|
2336 | if (argvec[count].reg && GET_CODE (argvec[count].reg) == EXPR_LIST) |
---|
2337 | abort (); |
---|
2338 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
---|
2339 | argvec[count].partial |
---|
2340 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); |
---|
2341 | #else |
---|
2342 | argvec[count].partial = 0; |
---|
2343 | #endif |
---|
2344 | |
---|
2345 | locate_and_pad_parm (mode, NULL_TREE, |
---|
2346 | argvec[count].reg && argvec[count].partial == 0, |
---|
2347 | NULL_TREE, &args_size, &argvec[count].offset, |
---|
2348 | &argvec[count].size); |
---|
2349 | |
---|
2350 | if (argvec[count].size.var) |
---|
2351 | abort (); |
---|
2352 | |
---|
2353 | #ifndef REG_PARM_STACK_SPACE |
---|
2354 | if (argvec[count].partial) |
---|
2355 | argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; |
---|
2356 | #endif |
---|
2357 | |
---|
2358 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
---|
2359 | #ifdef REG_PARM_STACK_SPACE |
---|
2360 | || 1 |
---|
2361 | #endif |
---|
2362 | ) |
---|
2363 | args_size.constant += argvec[count].size.constant; |
---|
2364 | |
---|
2365 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
2366 | /* If this arg is actually passed on the stack, it might be |
---|
2367 | clobbering something we already put there (this library call might |
---|
2368 | be inside the evaluation of an argument to a function whose call |
---|
2369 | requires the stack). This will only occur when the library call |
---|
2370 | has sufficient args to run out of argument registers. Abort in |
---|
2371 | this case; if this ever occurs, code must be added to save and |
---|
2372 | restore the arg slot. */ |
---|
2373 | |
---|
2374 | if (argvec[count].reg == 0 || argvec[count].partial != 0) |
---|
2375 | abort (); |
---|
2376 | #endif |
---|
2377 | |
---|
2378 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree)0, 1); |
---|
2379 | } |
---|
2380 | va_end (p); |
---|
2381 | |
---|
2382 | /* If this machine requires an external definition for library |
---|
2383 | functions, write one out. */ |
---|
2384 | assemble_external_libcall (fun); |
---|
2385 | |
---|
2386 | original_args_size = args_size; |
---|
2387 | #ifdef STACK_BOUNDARY |
---|
2388 | args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) |
---|
2389 | / STACK_BYTES) * STACK_BYTES); |
---|
2390 | #endif |
---|
2391 | |
---|
2392 | #ifdef REG_PARM_STACK_SPACE |
---|
2393 | args_size.constant = MAX (args_size.constant, |
---|
2394 | REG_PARM_STACK_SPACE (NULL_TREE)); |
---|
2395 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
---|
2396 | args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE); |
---|
2397 | #endif |
---|
2398 | #endif |
---|
2399 | |
---|
2400 | if (args_size.constant > current_function_outgoing_args_size) |
---|
2401 | current_function_outgoing_args_size = args_size.constant; |
---|
2402 | |
---|
2403 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
2404 | args_size.constant = 0; |
---|
2405 | #endif |
---|
2406 | |
---|
2407 | #ifndef PUSH_ROUNDING |
---|
2408 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); |
---|
2409 | #endif |
---|
2410 | |
---|
2411 | #ifdef PUSH_ARGS_REVERSED |
---|
2412 | #ifdef STACK_BOUNDARY |
---|
2413 | /* If we push args individually in reverse order, perform stack alignment |
---|
2414 | before the first push (the last arg). */ |
---|
2415 | if (argblock == 0) |
---|
2416 | anti_adjust_stack (GEN_INT (args_size.constant |
---|
2417 | - original_args_size.constant)); |
---|
2418 | #endif |
---|
2419 | #endif |
---|
2420 | |
---|
2421 | #ifdef PUSH_ARGS_REVERSED |
---|
2422 | inc = -1; |
---|
2423 | argnum = nargs - 1; |
---|
2424 | #else |
---|
2425 | inc = 1; |
---|
2426 | argnum = 0; |
---|
2427 | #endif |
---|
2428 | |
---|
2429 | /* Push the args that need to be pushed. */ |
---|
2430 | |
---|
2431 | for (count = 0; count < nargs; count++, argnum += inc) |
---|
2432 | { |
---|
2433 | register enum machine_mode mode = argvec[argnum].mode; |
---|
2434 | register rtx val = argvec[argnum].value; |
---|
2435 | rtx reg = argvec[argnum].reg; |
---|
2436 | int partial = argvec[argnum].partial; |
---|
2437 | |
---|
2438 | if (! (reg != 0 && partial == 0)) |
---|
2439 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, |
---|
2440 | argblock, GEN_INT (argvec[count].offset.constant)); |
---|
2441 | NO_DEFER_POP; |
---|
2442 | } |
---|
2443 | |
---|
2444 | #ifndef PUSH_ARGS_REVERSED |
---|
2445 | #ifdef STACK_BOUNDARY |
---|
2446 | /* If we pushed args in forward order, perform stack alignment |
---|
2447 | after pushing the last arg. */ |
---|
2448 | if (argblock == 0) |
---|
2449 | anti_adjust_stack (GEN_INT (args_size.constant |
---|
2450 | - original_args_size.constant)); |
---|
2451 | #endif |
---|
2452 | #endif |
---|
2453 | |
---|
2454 | #ifdef PUSH_ARGS_REVERSED |
---|
2455 | argnum = nargs - 1; |
---|
2456 | #else |
---|
2457 | argnum = 0; |
---|
2458 | #endif |
---|
2459 | |
---|
2460 | fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0); |
---|
2461 | |
---|
2462 | /* Now load any reg parms into their regs. */ |
---|
2463 | |
---|
2464 | for (count = 0; count < nargs; count++, argnum += inc) |
---|
2465 | { |
---|
2466 | register enum machine_mode mode = argvec[argnum].mode; |
---|
2467 | register rtx val = argvec[argnum].value; |
---|
2468 | rtx reg = argvec[argnum].reg; |
---|
2469 | int partial = argvec[argnum].partial; |
---|
2470 | |
---|
2471 | if (reg != 0 && partial == 0) |
---|
2472 | emit_move_insn (reg, val); |
---|
2473 | NO_DEFER_POP; |
---|
2474 | } |
---|
2475 | |
---|
2476 | /* For version 1.37, try deleting this entirely. */ |
---|
2477 | if (! no_queue) |
---|
2478 | emit_queue (); |
---|
2479 | |
---|
2480 | /* Any regs containing parms remain in use through the call. */ |
---|
2481 | for (count = 0; count < nargs; count++) |
---|
2482 | if (argvec[count].reg != 0) |
---|
2483 | use_reg (&call_fusage, argvec[count].reg); |
---|
2484 | |
---|
2485 | /* Don't allow popping to be deferred, since then |
---|
2486 | cse'ing of library calls could delete a call and leave the pop. */ |
---|
2487 | NO_DEFER_POP; |
---|
2488 | |
---|
2489 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
---|
2490 | will set inhibit_defer_pop to that value. */ |
---|
2491 | |
---|
2492 | emit_call_1 (fun, |
---|
2493 | get_identifier (XSTR (orgfun, 0)), |
---|
2494 | get_identifier (XSTR (orgfun, 0)), args_size.constant, 0, |
---|
2495 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), |
---|
2496 | outmode != VOIDmode ? hard_libcall_value (outmode) : NULL_RTX, |
---|
2497 | old_inhibit_defer_pop + 1, call_fusage, no_queue); |
---|
2498 | |
---|
2499 | pop_temp_slots (); |
---|
2500 | |
---|
2501 | /* Now restore inhibit_defer_pop to its actual original value. */ |
---|
2502 | OK_DEFER_POP; |
---|
2503 | } |
---|
2504 | |
---|
2505 | /* Like emit_library_call except that an extra argument, VALUE, |
---|
2506 | comes second and says where to store the result. |
---|
2507 | (If VALUE is zero, this function chooses a convenient way |
---|
2508 | to return the value. |
---|
2509 | |
---|
2510 | This function returns an rtx for where the value is to be found. |
---|
2511 | If VALUE is nonzero, VALUE is returned. */ |
---|
2512 | |
---|
2513 | rtx |
---|
2514 | emit_library_call_value VPROTO((rtx orgfun, rtx value, int no_queue, |
---|
2515 | enum machine_mode outmode, int nargs, ...)) |
---|
2516 | { |
---|
2517 | #ifndef __STDC__ |
---|
2518 | rtx orgfun; |
---|
2519 | rtx value; |
---|
2520 | int no_queue; |
---|
2521 | enum machine_mode outmode; |
---|
2522 | int nargs; |
---|
2523 | #endif |
---|
2524 | va_list p; |
---|
2525 | /* Total size in bytes of all the stack-parms scanned so far. */ |
---|
2526 | struct args_size args_size; |
---|
2527 | /* Size of arguments before any adjustments (such as rounding). */ |
---|
2528 | struct args_size original_args_size; |
---|
2529 | register int argnum; |
---|
2530 | rtx fun; |
---|
2531 | int inc; |
---|
2532 | int count; |
---|
2533 | rtx argblock = 0; |
---|
2534 | CUMULATIVE_ARGS args_so_far; |
---|
2535 | struct arg { rtx value; enum machine_mode mode; rtx reg; int partial; |
---|
2536 | struct args_size offset; struct args_size size; }; |
---|
2537 | struct arg *argvec; |
---|
2538 | int old_inhibit_defer_pop = inhibit_defer_pop; |
---|
2539 | rtx call_fusage = 0; |
---|
2540 | rtx mem_value = 0; |
---|
2541 | int pcc_struct_value = 0; |
---|
2542 | int struct_value_size = 0; |
---|
2543 | /* library calls are never indirect calls. */ |
---|
2544 | int current_call_is_indirect = 0; |
---|
2545 | int is_const; |
---|
2546 | |
---|
2547 | VA_START (p, nargs); |
---|
2548 | |
---|
2549 | #ifndef __STDC__ |
---|
2550 | orgfun = va_arg (p, rtx); |
---|
2551 | value = va_arg (p, rtx); |
---|
2552 | no_queue = va_arg (p, int); |
---|
2553 | outmode = va_arg (p, enum machine_mode); |
---|
2554 | nargs = va_arg (p, int); |
---|
2555 | #endif |
---|
2556 | |
---|
2557 | is_const = no_queue; |
---|
2558 | fun = orgfun; |
---|
2559 | |
---|
2560 | /* If this kind of value comes back in memory, |
---|
2561 | decide where in memory it should come back. */ |
---|
2562 | if (aggregate_value_p (type_for_mode (outmode, 0))) |
---|
2563 | { |
---|
2564 | #ifdef PCC_STATIC_STRUCT_RETURN |
---|
2565 | rtx pointer_reg |
---|
2566 | = hard_function_value (build_pointer_type (type_for_mode (outmode, 0)), |
---|
2567 | 0); |
---|
2568 | mem_value = gen_rtx (MEM, outmode, pointer_reg); |
---|
2569 | pcc_struct_value = 1; |
---|
2570 | if (value == 0) |
---|
2571 | value = gen_reg_rtx (outmode); |
---|
2572 | #else /* not PCC_STATIC_STRUCT_RETURN */ |
---|
2573 | struct_value_size = GET_MODE_SIZE (outmode); |
---|
2574 | if (value != 0 && GET_CODE (value) == MEM) |
---|
2575 | mem_value = value; |
---|
2576 | else |
---|
2577 | mem_value = assign_stack_temp (outmode, GET_MODE_SIZE (outmode), 0); |
---|
2578 | #endif |
---|
2579 | |
---|
2580 | /* This call returns a big structure. */ |
---|
2581 | is_const = 0; |
---|
2582 | } |
---|
2583 | |
---|
2584 | /* ??? Unfinished: must pass the memory address as an argument. */ |
---|
2585 | |
---|
2586 | /* Copy all the libcall-arguments out of the varargs data |
---|
2587 | and into a vector ARGVEC. |
---|
2588 | |
---|
2589 | Compute how to pass each argument. We only support a very small subset |
---|
2590 | of the full argument passing conventions to limit complexity here since |
---|
2591 | library functions shouldn't have many args. */ |
---|
2592 | |
---|
2593 | argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg)); |
---|
2594 | |
---|
2595 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun); |
---|
2596 | |
---|
2597 | args_size.constant = 0; |
---|
2598 | args_size.var = 0; |
---|
2599 | |
---|
2600 | count = 0; |
---|
2601 | |
---|
2602 | push_temp_slots (); |
---|
2603 | |
---|
2604 | /* If there's a structure value address to be passed, |
---|
2605 | either pass it in the special place, or pass it as an extra argument. */ |
---|
2606 | if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value) |
---|
2607 | { |
---|
2608 | rtx addr = XEXP (mem_value, 0); |
---|
2609 | nargs++; |
---|
2610 | |
---|
2611 | /* Make sure it is a reasonable operand for a move or push insn. */ |
---|
2612 | if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM |
---|
2613 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) |
---|
2614 | addr = force_operand (addr, NULL_RTX); |
---|
2615 | |
---|
2616 | argvec[count].value = addr; |
---|
2617 | argvec[count].mode = Pmode; |
---|
2618 | argvec[count].partial = 0; |
---|
2619 | |
---|
2620 | argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); |
---|
2621 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
---|
2622 | if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1)) |
---|
2623 | abort (); |
---|
2624 | #endif |
---|
2625 | |
---|
2626 | locate_and_pad_parm (Pmode, NULL_TREE, |
---|
2627 | argvec[count].reg && argvec[count].partial == 0, |
---|
2628 | NULL_TREE, &args_size, &argvec[count].offset, |
---|
2629 | &argvec[count].size); |
---|
2630 | |
---|
2631 | |
---|
2632 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
---|
2633 | #ifdef REG_PARM_STACK_SPACE |
---|
2634 | || 1 |
---|
2635 | #endif |
---|
2636 | ) |
---|
2637 | args_size.constant += argvec[count].size.constant; |
---|
2638 | |
---|
2639 | FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree)0, 1); |
---|
2640 | |
---|
2641 | count++; |
---|
2642 | } |
---|
2643 | |
---|
2644 | for (; count < nargs; count++) |
---|
2645 | { |
---|
2646 | rtx val = va_arg (p, rtx); |
---|
2647 | enum machine_mode mode = va_arg (p, enum machine_mode); |
---|
2648 | |
---|
2649 | /* We cannot convert the arg value to the mode the library wants here; |
---|
2650 | must do it earlier where we know the signedness of the arg. */ |
---|
2651 | if (mode == BLKmode |
---|
2652 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) |
---|
2653 | abort (); |
---|
2654 | |
---|
2655 | /* On some machines, there's no way to pass a float to a library fcn. |
---|
2656 | Pass it as a double instead. */ |
---|
2657 | #ifdef LIBGCC_NEEDS_DOUBLE |
---|
2658 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) |
---|
2659 | val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; |
---|
2660 | #endif |
---|
2661 | |
---|
2662 | /* There's no need to call protect_from_queue, because |
---|
2663 | either emit_move_insn or emit_push_insn will do that. */ |
---|
2664 | |
---|
2665 | /* Make sure it is a reasonable operand for a move or push insn. */ |
---|
2666 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM |
---|
2667 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) |
---|
2668 | val = force_operand (val, NULL_RTX); |
---|
2669 | |
---|
2670 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE |
---|
2671 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) |
---|
2672 | { |
---|
2673 | /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can |
---|
2674 | be viewed as just an efficiency improvement. */ |
---|
2675 | rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0); |
---|
2676 | emit_move_insn (slot, val); |
---|
2677 | val = XEXP (slot, 0); |
---|
2678 | mode = Pmode; |
---|
2679 | } |
---|
2680 | #endif |
---|
2681 | |
---|
2682 | argvec[count].value = val; |
---|
2683 | argvec[count].mode = mode; |
---|
2684 | |
---|
2685 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); |
---|
2686 | if (argvec[count].reg && GET_CODE (argvec[count].reg) == EXPR_LIST) |
---|
2687 | abort (); |
---|
2688 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
---|
2689 | argvec[count].partial |
---|
2690 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); |
---|
2691 | #else |
---|
2692 | argvec[count].partial = 0; |
---|
2693 | #endif |
---|
2694 | |
---|
2695 | locate_and_pad_parm (mode, NULL_TREE, |
---|
2696 | argvec[count].reg && argvec[count].partial == 0, |
---|
2697 | NULL_TREE, &args_size, &argvec[count].offset, |
---|
2698 | &argvec[count].size); |
---|
2699 | |
---|
2700 | if (argvec[count].size.var) |
---|
2701 | abort (); |
---|
2702 | |
---|
2703 | #ifndef REG_PARM_STACK_SPACE |
---|
2704 | if (argvec[count].partial) |
---|
2705 | argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; |
---|
2706 | #endif |
---|
2707 | |
---|
2708 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
---|
2709 | #ifdef REG_PARM_STACK_SPACE |
---|
2710 | || 1 |
---|
2711 | #endif |
---|
2712 | ) |
---|
2713 | args_size.constant += argvec[count].size.constant; |
---|
2714 | |
---|
2715 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
2716 | /* If this arg is actually passed on the stack, it might be |
---|
2717 | clobbering something we already put there (this library call might |
---|
2718 | be inside the evaluation of an argument to a function whose call |
---|
2719 | requires the stack). This will only occur when the library call |
---|
2720 | has sufficient args to run out of argument registers. Abort in |
---|
2721 | this case; if this ever occurs, code must be added to save and |
---|
2722 | restore the arg slot. */ |
---|
2723 | |
---|
2724 | if (argvec[count].reg == 0 || argvec[count].partial != 0) |
---|
2725 | abort (); |
---|
2726 | #endif |
---|
2727 | |
---|
2728 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree)0, 1); |
---|
2729 | } |
---|
2730 | va_end (p); |
---|
2731 | |
---|
2732 | /* If this machine requires an external definition for library |
---|
2733 | functions, write one out. */ |
---|
2734 | assemble_external_libcall (fun); |
---|
2735 | |
---|
2736 | original_args_size = args_size; |
---|
2737 | #ifdef STACK_BOUNDARY |
---|
2738 | args_size.constant = (((args_size.constant + (STACK_BYTES - 1)) |
---|
2739 | / STACK_BYTES) * STACK_BYTES); |
---|
2740 | #endif |
---|
2741 | |
---|
2742 | #ifdef REG_PARM_STACK_SPACE |
---|
2743 | args_size.constant = MAX (args_size.constant, |
---|
2744 | REG_PARM_STACK_SPACE (NULL_TREE)); |
---|
2745 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
---|
2746 | args_size.constant -= REG_PARM_STACK_SPACE (NULL_TREE); |
---|
2747 | #endif |
---|
2748 | #endif |
---|
2749 | |
---|
2750 | if (args_size.constant > current_function_outgoing_args_size) |
---|
2751 | current_function_outgoing_args_size = args_size.constant; |
---|
2752 | |
---|
2753 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
2754 | args_size.constant = 0; |
---|
2755 | #endif |
---|
2756 | |
---|
2757 | #ifndef PUSH_ROUNDING |
---|
2758 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); |
---|
2759 | #endif |
---|
2760 | |
---|
2761 | #ifdef PUSH_ARGS_REVERSED |
---|
2762 | #ifdef STACK_BOUNDARY |
---|
2763 | /* If we push args individually in reverse order, perform stack alignment |
---|
2764 | before the first push (the last arg). */ |
---|
2765 | if (argblock == 0) |
---|
2766 | anti_adjust_stack (GEN_INT (args_size.constant |
---|
2767 | - original_args_size.constant)); |
---|
2768 | #endif |
---|
2769 | #endif |
---|
2770 | |
---|
2771 | #ifdef PUSH_ARGS_REVERSED |
---|
2772 | inc = -1; |
---|
2773 | argnum = nargs - 1; |
---|
2774 | #else |
---|
2775 | inc = 1; |
---|
2776 | argnum = 0; |
---|
2777 | #endif |
---|
2778 | |
---|
2779 | /* Push the args that need to be pushed. */ |
---|
2780 | |
---|
2781 | for (count = 0; count < nargs; count++, argnum += inc) |
---|
2782 | { |
---|
2783 | register enum machine_mode mode = argvec[argnum].mode; |
---|
2784 | register rtx val = argvec[argnum].value; |
---|
2785 | rtx reg = argvec[argnum].reg; |
---|
2786 | int partial = argvec[argnum].partial; |
---|
2787 | |
---|
2788 | if (! (reg != 0 && partial == 0)) |
---|
2789 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, |
---|
2790 | argblock, GEN_INT (argvec[count].offset.constant)); |
---|
2791 | NO_DEFER_POP; |
---|
2792 | } |
---|
2793 | |
---|
2794 | #ifndef PUSH_ARGS_REVERSED |
---|
2795 | #ifdef STACK_BOUNDARY |
---|
2796 | /* If we pushed args in forward order, perform stack alignment |
---|
2797 | after pushing the last arg. */ |
---|
2798 | if (argblock == 0) |
---|
2799 | anti_adjust_stack (GEN_INT (args_size.constant |
---|
2800 | - original_args_size.constant)); |
---|
2801 | #endif |
---|
2802 | #endif |
---|
2803 | |
---|
2804 | #ifdef PUSH_ARGS_REVERSED |
---|
2805 | argnum = nargs - 1; |
---|
2806 | #else |
---|
2807 | argnum = 0; |
---|
2808 | #endif |
---|
2809 | |
---|
2810 | fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0); |
---|
2811 | |
---|
2812 | /* Now load any reg parms into their regs. */ |
---|
2813 | |
---|
2814 | for (count = 0; count < nargs; count++, argnum += inc) |
---|
2815 | { |
---|
2816 | register enum machine_mode mode = argvec[argnum].mode; |
---|
2817 | register rtx val = argvec[argnum].value; |
---|
2818 | rtx reg = argvec[argnum].reg; |
---|
2819 | int partial = argvec[argnum].partial; |
---|
2820 | |
---|
2821 | if (reg != 0 && partial == 0) |
---|
2822 | emit_move_insn (reg, val); |
---|
2823 | NO_DEFER_POP; |
---|
2824 | } |
---|
2825 | |
---|
2826 | #if 0 |
---|
2827 | /* For version 1.37, try deleting this entirely. */ |
---|
2828 | if (! no_queue) |
---|
2829 | emit_queue (); |
---|
2830 | #endif |
---|
2831 | |
---|
2832 | /* Any regs containing parms remain in use through the call. */ |
---|
2833 | for (count = 0; count < nargs; count++) |
---|
2834 | if (argvec[count].reg != 0) |
---|
2835 | use_reg (&call_fusage, argvec[count].reg); |
---|
2836 | |
---|
2837 | /* Pass the function the address in which to return a structure value. */ |
---|
2838 | if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value) |
---|
2839 | { |
---|
2840 | emit_move_insn (struct_value_rtx, |
---|
2841 | force_reg (Pmode, |
---|
2842 | force_operand (XEXP (mem_value, 0), |
---|
2843 | NULL_RTX))); |
---|
2844 | if (GET_CODE (struct_value_rtx) == REG) |
---|
2845 | use_reg (&call_fusage, struct_value_rtx); |
---|
2846 | } |
---|
2847 | |
---|
2848 | /* Don't allow popping to be deferred, since then |
---|
2849 | cse'ing of library calls could delete a call and leave the pop. */ |
---|
2850 | NO_DEFER_POP; |
---|
2851 | |
---|
2852 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
---|
2853 | will set inhibit_defer_pop to that value. */ |
---|
2854 | |
---|
2855 | emit_call_1 (fun, |
---|
2856 | get_identifier (XSTR (orgfun, 0)), |
---|
2857 | get_identifier (XSTR (orgfun, 0)), args_size.constant, |
---|
2858 | struct_value_size, |
---|
2859 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), |
---|
2860 | (outmode != VOIDmode && mem_value == 0 |
---|
2861 | ? hard_libcall_value (outmode) : NULL_RTX), |
---|
2862 | old_inhibit_defer_pop + 1, call_fusage, is_const); |
---|
2863 | |
---|
2864 | /* Now restore inhibit_defer_pop to its actual original value. */ |
---|
2865 | OK_DEFER_POP; |
---|
2866 | |
---|
2867 | pop_temp_slots (); |
---|
2868 | |
---|
2869 | /* Copy the value to the right place. */ |
---|
2870 | if (outmode != VOIDmode) |
---|
2871 | { |
---|
2872 | if (mem_value) |
---|
2873 | { |
---|
2874 | if (value == 0) |
---|
2875 | value = mem_value; |
---|
2876 | if (value != mem_value) |
---|
2877 | emit_move_insn (value, mem_value); |
---|
2878 | } |
---|
2879 | else if (value != 0) |
---|
2880 | emit_move_insn (value, hard_libcall_value (outmode)); |
---|
2881 | else |
---|
2882 | value = hard_libcall_value (outmode); |
---|
2883 | } |
---|
2884 | |
---|
2885 | return value; |
---|
2886 | } |
---|
2887 | |
---|
2888 | #if 0 |
---|
2889 | /* Return an rtx which represents a suitable home on the stack |
---|
2890 | given TYPE, the type of the argument looking for a home. |
---|
2891 | This is called only for BLKmode arguments. |
---|
2892 | |
---|
2893 | SIZE is the size needed for this target. |
---|
2894 | ARGS_ADDR is the address of the bottom of the argument block for this call. |
---|
2895 | OFFSET describes this parameter's offset into ARGS_ADDR. It is meaningless |
---|
2896 | if this machine uses push insns. */ |
---|
2897 | |
---|
2898 | static rtx |
---|
2899 | target_for_arg (type, size, args_addr, offset) |
---|
2900 | tree type; |
---|
2901 | rtx size; |
---|
2902 | rtx args_addr; |
---|
2903 | struct args_size offset; |
---|
2904 | { |
---|
2905 | rtx target; |
---|
2906 | rtx offset_rtx = ARGS_SIZE_RTX (offset); |
---|
2907 | |
---|
2908 | /* We do not call memory_address if possible, |
---|
2909 | because we want to address as close to the stack |
---|
2910 | as possible. For non-variable sized arguments, |
---|
2911 | this will be stack-pointer relative addressing. */ |
---|
2912 | if (GET_CODE (offset_rtx) == CONST_INT) |
---|
2913 | target = plus_constant (args_addr, INTVAL (offset_rtx)); |
---|
2914 | else |
---|
2915 | { |
---|
2916 | /* I have no idea how to guarantee that this |
---|
2917 | will work in the presence of register parameters. */ |
---|
2918 | target = gen_rtx (PLUS, Pmode, args_addr, offset_rtx); |
---|
2919 | target = memory_address (QImode, target); |
---|
2920 | } |
---|
2921 | |
---|
2922 | return gen_rtx (MEM, BLKmode, target); |
---|
2923 | } |
---|
2924 | #endif |
---|
2925 | |
---|
2926 | /* Store a single argument for a function call |
---|
2927 | into the register or memory area where it must be passed. |
---|
2928 | *ARG describes the argument value and where to pass it. |
---|
2929 | |
---|
2930 | ARGBLOCK is the address of the stack-block for all the arguments, |
---|
2931 | or 0 on a machine where arguments are pushed individually. |
---|
2932 | |
---|
2933 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' |
---|
2934 | so must be careful about how the stack is used. |
---|
2935 | |
---|
2936 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing |
---|
2937 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate |
---|
2938 | that we need not worry about saving and restoring the stack. |
---|
2939 | |
---|
2940 | FNDECL is the declaration of the function we are calling. */ |
---|
2941 | |
---|
2942 | static void |
---|
2943 | store_one_arg (arg, argblock, may_be_alloca, variable_size, fndecl, |
---|
2944 | reg_parm_stack_space) |
---|
2945 | struct arg_data *arg; |
---|
2946 | rtx argblock; |
---|
2947 | int may_be_alloca; |
---|
2948 | int variable_size; |
---|
2949 | tree fndecl; |
---|
2950 | int reg_parm_stack_space; |
---|
2951 | { |
---|
2952 | register tree pval = arg->tree_value; |
---|
2953 | rtx reg = 0; |
---|
2954 | int partial = 0; |
---|
2955 | int used = 0; |
---|
2956 | int i, lower_bound, upper_bound; |
---|
2957 | |
---|
2958 | if (TREE_CODE (pval) == ERROR_MARK) |
---|
2959 | return; |
---|
2960 | |
---|
2961 | /* Push a new temporary level for any temporaries we make for |
---|
2962 | this argument. */ |
---|
2963 | push_temp_slots (); |
---|
2964 | |
---|
2965 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
2966 | /* If this is being stored into a pre-allocated, fixed-size, stack area, |
---|
2967 | save any previous data at that location. */ |
---|
2968 | if (argblock && ! variable_size && arg->stack) |
---|
2969 | { |
---|
2970 | #ifdef ARGS_GROW_DOWNWARD |
---|
2971 | /* stack_slot is negative, but we want to index stack_usage_map */ |
---|
2972 | /* with positive values. */ |
---|
2973 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
---|
2974 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; |
---|
2975 | else |
---|
2976 | abort (); |
---|
2977 | |
---|
2978 | lower_bound = upper_bound - arg->size.constant; |
---|
2979 | #else |
---|
2980 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
---|
2981 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); |
---|
2982 | else |
---|
2983 | lower_bound = 0; |
---|
2984 | |
---|
2985 | upper_bound = lower_bound + arg->size.constant; |
---|
2986 | #endif |
---|
2987 | |
---|
2988 | for (i = lower_bound; i < upper_bound; i++) |
---|
2989 | if (stack_usage_map[i] |
---|
2990 | #ifdef REG_PARM_STACK_SPACE |
---|
2991 | /* Don't store things in the fixed argument area at this point; |
---|
2992 | it has already been saved. */ |
---|
2993 | && i > reg_parm_stack_space |
---|
2994 | #endif |
---|
2995 | ) |
---|
2996 | break; |
---|
2997 | |
---|
2998 | if (i != upper_bound) |
---|
2999 | { |
---|
3000 | /* We need to make a save area. See what mode we can make it. */ |
---|
3001 | enum machine_mode save_mode |
---|
3002 | = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1); |
---|
3003 | rtx stack_area |
---|
3004 | = gen_rtx (MEM, save_mode, |
---|
3005 | memory_address (save_mode, XEXP (arg->stack_slot, 0))); |
---|
3006 | |
---|
3007 | if (save_mode == BLKmode) |
---|
3008 | { |
---|
3009 | arg->save_area = assign_stack_temp (BLKmode, |
---|
3010 | arg->size.constant, 0); |
---|
3011 | MEM_IN_STRUCT_P (arg->save_area) |
---|
3012 | = AGGREGATE_TYPE_P (TREE_TYPE (arg->tree_value)); |
---|
3013 | preserve_temp_slots (arg->save_area); |
---|
3014 | emit_block_move (validize_mem (arg->save_area), stack_area, |
---|
3015 | GEN_INT (arg->size.constant), |
---|
3016 | PARM_BOUNDARY / BITS_PER_UNIT); |
---|
3017 | } |
---|
3018 | else |
---|
3019 | { |
---|
3020 | arg->save_area = gen_reg_rtx (save_mode); |
---|
3021 | emit_move_insn (arg->save_area, stack_area); |
---|
3022 | } |
---|
3023 | } |
---|
3024 | } |
---|
3025 | #endif |
---|
3026 | |
---|
3027 | /* If this isn't going to be placed on both the stack and in registers, |
---|
3028 | set up the register and number of words. */ |
---|
3029 | if (! arg->pass_on_stack) |
---|
3030 | reg = arg->reg, partial = arg->partial; |
---|
3031 | |
---|
3032 | if (reg != 0 && partial == 0) |
---|
3033 | /* Being passed entirely in a register. We shouldn't be called in |
---|
3034 | this case. */ |
---|
3035 | abort (); |
---|
3036 | |
---|
3037 | #ifdef STRICT_ALIGNMENT |
---|
3038 | /* If this arg needs special alignment, don't load the registers |
---|
3039 | here. */ |
---|
3040 | if (arg->n_aligned_regs != 0) |
---|
3041 | reg = 0; |
---|
3042 | #endif |
---|
3043 | |
---|
3044 | /* If this is being partially passed in a register, but multiple locations |
---|
3045 | are specified, we assume that the one partially used is the one that is |
---|
3046 | listed first. */ |
---|
3047 | if (reg && GET_CODE (reg) == EXPR_LIST) |
---|
3048 | reg = XEXP (reg, 0); |
---|
3049 | |
---|
3050 | /* If this is being passed partially in a register, we can't evaluate |
---|
3051 | it directly into its stack slot. Otherwise, we can. */ |
---|
3052 | if (arg->value == 0) |
---|
3053 | { |
---|
3054 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
3055 | /* stack_arg_under_construction is nonzero if a function argument is |
---|
3056 | being evaluated directly into the outgoing argument list and |
---|
3057 | expand_call must take special action to preserve the argument list |
---|
3058 | if it is called recursively. |
---|
3059 | |
---|
3060 | For scalar function arguments stack_usage_map is sufficient to |
---|
3061 | determine which stack slots must be saved and restored. Scalar |
---|
3062 | arguments in general have pass_on_stack == 0. |
---|
3063 | |
---|
3064 | If this argument is initialized by a function which takes the |
---|
3065 | address of the argument (a C++ constructor or a C function |
---|
3066 | returning a BLKmode structure), then stack_usage_map is |
---|
3067 | insufficient and expand_call must push the stack around the |
---|
3068 | function call. Such arguments have pass_on_stack == 1. |
---|
3069 | |
---|
3070 | Note that it is always safe to set stack_arg_under_construction, |
---|
3071 | but this generates suboptimal code if set when not needed. */ |
---|
3072 | |
---|
3073 | if (arg->pass_on_stack) |
---|
3074 | stack_arg_under_construction++; |
---|
3075 | #endif |
---|
3076 | arg->value = expand_expr (pval, |
---|
3077 | (partial |
---|
3078 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) |
---|
3079 | ? NULL_RTX : arg->stack, |
---|
3080 | VOIDmode, 0); |
---|
3081 | |
---|
3082 | /* If we are promoting object (or for any other reason) the mode |
---|
3083 | doesn't agree, convert the mode. */ |
---|
3084 | |
---|
3085 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
---|
3086 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), |
---|
3087 | arg->value, arg->unsignedp); |
---|
3088 | |
---|
3089 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
3090 | if (arg->pass_on_stack) |
---|
3091 | stack_arg_under_construction--; |
---|
3092 | #endif |
---|
3093 | } |
---|
3094 | |
---|
3095 | /* Don't allow anything left on stack from computation |
---|
3096 | of argument to alloca. */ |
---|
3097 | if (may_be_alloca) |
---|
3098 | do_pending_stack_adjust (); |
---|
3099 | |
---|
3100 | if (arg->value == arg->stack) |
---|
3101 | /* If the value is already in the stack slot, we are done. */ |
---|
3102 | ; |
---|
3103 | else if (arg->mode != BLKmode) |
---|
3104 | { |
---|
3105 | register int size; |
---|
3106 | |
---|
3107 | /* Argument is a scalar, not entirely passed in registers. |
---|
3108 | (If part is passed in registers, arg->partial says how much |
---|
3109 | and emit_push_insn will take care of putting it there.) |
---|
3110 | |
---|
3111 | Push it, and if its size is less than the |
---|
3112 | amount of space allocated to it, |
---|
3113 | also bump stack pointer by the additional space. |
---|
3114 | Note that in C the default argument promotions |
---|
3115 | will prevent such mismatches. */ |
---|
3116 | |
---|
3117 | size = GET_MODE_SIZE (arg->mode); |
---|
3118 | /* Compute how much space the push instruction will push. |
---|
3119 | On many machines, pushing a byte will advance the stack |
---|
3120 | pointer by a halfword. */ |
---|
3121 | #ifdef PUSH_ROUNDING |
---|
3122 | size = PUSH_ROUNDING (size); |
---|
3123 | #endif |
---|
3124 | used = size; |
---|
3125 | |
---|
3126 | /* Compute how much space the argument should get: |
---|
3127 | round up to a multiple of the alignment for arguments. */ |
---|
3128 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
---|
3129 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
---|
3130 | / (PARM_BOUNDARY / BITS_PER_UNIT)) |
---|
3131 | * (PARM_BOUNDARY / BITS_PER_UNIT)); |
---|
3132 | |
---|
3133 | /* This isn't already where we want it on the stack, so put it there. |
---|
3134 | This can either be done with push or copy insns. */ |
---|
3135 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, |
---|
3136 | 0, partial, reg, used - size, |
---|
3137 | argblock, ARGS_SIZE_RTX (arg->offset)); |
---|
3138 | } |
---|
3139 | else |
---|
3140 | { |
---|
3141 | /* BLKmode, at least partly to be pushed. */ |
---|
3142 | |
---|
3143 | register int excess; |
---|
3144 | rtx size_rtx; |
---|
3145 | |
---|
3146 | /* Pushing a nonscalar. |
---|
3147 | If part is passed in registers, PARTIAL says how much |
---|
3148 | and emit_push_insn will take care of putting it there. */ |
---|
3149 | |
---|
3150 | /* Round its size up to a multiple |
---|
3151 | of the allocation unit for arguments. */ |
---|
3152 | |
---|
3153 | if (arg->size.var != 0) |
---|
3154 | { |
---|
3155 | excess = 0; |
---|
3156 | size_rtx = ARGS_SIZE_RTX (arg->size); |
---|
3157 | } |
---|
3158 | else |
---|
3159 | { |
---|
3160 | /* PUSH_ROUNDING has no effect on us, because |
---|
3161 | emit_push_insn for BLKmode is careful to avoid it. */ |
---|
3162 | excess = (arg->size.constant - int_size_in_bytes (TREE_TYPE (pval)) |
---|
3163 | + partial * UNITS_PER_WORD); |
---|
3164 | size_rtx = expr_size (pval); |
---|
3165 | } |
---|
3166 | |
---|
3167 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
---|
3168 | TYPE_ALIGN (TREE_TYPE (pval)) / BITS_PER_UNIT, partial, |
---|
3169 | reg, excess, argblock, ARGS_SIZE_RTX (arg->offset)); |
---|
3170 | } |
---|
3171 | |
---|
3172 | |
---|
3173 | /* Unless this is a partially-in-register argument, the argument is now |
---|
3174 | in the stack. |
---|
3175 | |
---|
3176 | ??? Note that this can change arg->value from arg->stack to |
---|
3177 | arg->stack_slot and it matters when they are not the same. |
---|
3178 | It isn't totally clear that this is correct in all cases. */ |
---|
3179 | if (partial == 0) |
---|
3180 | arg->value = arg->stack_slot; |
---|
3181 | |
---|
3182 | /* Once we have pushed something, pops can't safely |
---|
3183 | be deferred during the rest of the arguments. */ |
---|
3184 | NO_DEFER_POP; |
---|
3185 | |
---|
3186 | /* ANSI doesn't require a sequence point here, |
---|
3187 | but PCC has one, so this will avoid some problems. */ |
---|
3188 | emit_queue (); |
---|
3189 | |
---|
3190 | /* Free any temporary slots made in processing this argument. Show |
---|
3191 | that we might have taken the address of something and pushed that |
---|
3192 | as an operand. */ |
---|
3193 | preserve_temp_slots (NULL_RTX); |
---|
3194 | free_temp_slots (); |
---|
3195 | pop_temp_slots (); |
---|
3196 | |
---|
3197 | #ifdef ACCUMULATE_OUTGOING_ARGS |
---|
3198 | /* Now mark the segment we just used. */ |
---|
3199 | if (argblock && ! variable_size && arg->stack) |
---|
3200 | for (i = lower_bound; i < upper_bound; i++) |
---|
3201 | stack_usage_map[i] = 1; |
---|
3202 | #endif |
---|
3203 | } |
---|