1 | /* Declarations for insn-output.c. These functions are defined in recog.c, |
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2 | final.c, and varasm.c. |
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3 | Copyright (C) 1987, 1991, 1994 Free Software Foundation, Inc. |
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4 | |
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5 | This file is part of GNU CC. |
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6 | |
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7 | GNU CC is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 2, or (at your option) |
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10 | any later version. |
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11 | |
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12 | GNU CC is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU General Public License |
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18 | along with GNU CC; see the file COPYING. If not, write to |
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19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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20 | Boston, MA 02111-1307, USA. */ |
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21 | |
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22 | /* Initialize data in final at the beginning of a compilation. */ |
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23 | extern void init_final PROTO((char *)); |
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24 | |
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25 | /* Called at end of source file, |
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26 | to output the block-profiling table for this entire compilation. */ |
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27 | extern void end_final PROTO((char *)); |
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28 | |
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29 | /* Enable APP processing of subsequent output. |
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30 | Used before the output from an `asm' statement. */ |
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31 | extern void app_enable PROTO((void)); |
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32 | |
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33 | /* Disable APP processing of subsequent output. |
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34 | Called from varasm.c before most kinds of output. */ |
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35 | extern void app_disable PROTO((void)); |
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36 | |
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37 | /* Return the number of slots filled in the current |
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38 | delayed branch sequence (we don't count the insn needing the |
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39 | delay slot). Zero if not in a delayed branch sequence. */ |
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40 | extern int dbr_sequence_length PROTO((void)); |
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41 | |
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42 | /* Indicate that branch shortening hasn't yet been done. */ |
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43 | extern void init_insn_lengths PROTO((void)); |
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44 | |
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45 | #ifdef RTX_CODE |
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46 | /* Obtain the current length of an insn. If branch shortening has been done, |
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47 | get its actual length. Otherwise, get its maximum length. */ |
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48 | extern int get_attr_length PROTO((rtx)); |
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49 | |
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50 | /* Make a pass over all insns and compute their actual lengths by shortening |
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51 | any branches of variable length if possible. */ |
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52 | extern void shorten_branches PROTO((rtx)); |
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53 | |
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54 | /* Output assembler code for the start of a function, |
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55 | and initialize some of the variables in this file |
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56 | for the new function. The label for the function and associated |
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57 | assembler pseudo-ops have already been output in |
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58 | `assemble_start_function'. */ |
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59 | extern void final_start_function STDIO_PROTO((rtx, FILE *, int)); |
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60 | |
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61 | /* Output assembler code for the end of a function. |
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62 | For clarity, args are same as those of `final_start_function' |
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63 | even though not all of them are needed. */ |
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64 | extern void final_end_function STDIO_PROTO((rtx, FILE *, int)); |
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65 | |
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66 | /* Output assembler code for some insns: all or part of a function. */ |
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67 | extern void final STDIO_PROTO((rtx, FILE *, int, int)); |
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68 | |
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69 | /* The final scan for one insn, INSN. Args are same as in `final', except |
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70 | that INSN is the insn being scanned. Value returned is the next insn to |
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71 | be scanned. */ |
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72 | extern rtx final_scan_insn STDIO_PROTO((rtx, FILE *, int, int, int)); |
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73 | |
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74 | /* Replace a SUBREG with a REG or a MEM, based on the thing it is a |
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75 | subreg of. */ |
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76 | extern rtx alter_subreg PROTO((rtx)); |
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77 | |
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78 | /* Report inconsistency between the assembler template and the operands. |
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79 | In an `asm', it's the user's fault; otherwise, the compiler's fault. */ |
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80 | extern void output_operand_lossage PROTO((char *)); |
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81 | |
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82 | /* Output a string of assembler code, substituting insn operands. |
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83 | Defined in final.c. */ |
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84 | extern void output_asm_insn PROTO((char *, rtx *)); |
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85 | |
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86 | /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */ |
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87 | extern void output_asm_label PROTO((rtx)); |
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88 | |
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89 | /* Print a memory reference operand for address X |
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90 | using machine-dependent assembler syntax. */ |
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91 | extern void output_address PROTO((rtx)); |
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92 | |
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93 | /* Print an integer constant expression in assembler syntax. |
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94 | Addition and subtraction are the only arithmetic |
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95 | that may appear in these expressions. */ |
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96 | extern void output_addr_const STDIO_PROTO((FILE *, rtx)); |
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97 | |
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98 | /* Output a string of assembler code, substituting numbers, strings |
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99 | and fixed syntactic prefixes. */ |
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100 | extern void asm_fprintf STDIO_PROTO(PVPROTO((FILE *file, |
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101 | char *p, ...))); |
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102 | |
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103 | /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single |
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104 | words. */ |
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105 | extern void split_double PROTO((rtx, rtx *, rtx *)); |
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106 | |
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107 | /* Return nonzero if this function has no function calls. */ |
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108 | extern int leaf_function_p PROTO((void)); |
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109 | |
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110 | /* Return 1 if this function uses only the registers that can be |
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111 | safely renumbered. */ |
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112 | extern int only_leaf_regs_used PROTO((void)); |
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113 | |
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114 | /* Scan IN_RTX and its subexpressions, and renumber all regs into those |
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115 | available in leaf functions. */ |
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116 | extern void leaf_renumber_regs_insn PROTO((rtx)); |
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117 | #endif |
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118 | |
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119 | /* Functions in varasm.c. */ |
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120 | |
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121 | /* Tell assembler to switch to text section. */ |
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122 | extern void text_section PROTO((void)); |
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123 | |
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124 | /* Tell assembler to switch to data section. */ |
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125 | extern void data_section PROTO((void)); |
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126 | |
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127 | /* Tell assembler to switch to read-only data section. This is normally |
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128 | the text section. */ |
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129 | extern void readonly_data_section PROTO((void)); |
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130 | |
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131 | /* Determine if we're in the text section. */ |
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132 | extern int in_text_section PROTO((void)); |
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133 | |
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134 | #ifdef TREE_CODE |
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135 | /* Tell assembler to change to section NAME for DECL. |
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136 | If DECL is NULL, just switch to section NAME. |
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137 | If NAME is NULL, get the name from DECL. */ |
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138 | extern void named_section PROTO((tree, char *)); |
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139 | |
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140 | /* Tell assembler to switch to the section for function DECL. */ |
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141 | extern void function_section PROTO((tree)); |
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142 | |
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143 | /* Create the rtl to represent a function, for a function definition. |
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144 | DECL is a FUNCTION_DECL node which describes which function. |
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145 | The rtl is stored into DECL. */ |
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146 | extern void make_function_rtl PROTO((tree)); |
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147 | |
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148 | /* Decode an `asm' spec for a declaration as a register name. |
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149 | Return the register number, or -1 if nothing specified, |
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150 | or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized, |
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151 | or -3 if ASMSPEC is `cc' and is not recognized, |
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152 | or -4 if ASMSPEC is `memory' and is not recognized. |
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153 | Accept an exact spelling or a decimal number. |
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154 | Prefixes such as % are optional. */ |
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155 | extern int decode_reg_name PROTO((char *)); |
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156 | |
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157 | /* Create the DECL_RTL for a declaration for a static or external variable |
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158 | or static or external function. |
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159 | ASMSPEC, if not 0, is the string which the user specified |
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160 | as the assembler symbol name. |
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161 | TOP_LEVEL is nonzero if this is a file-scope variable. |
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162 | |
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163 | This is never called for PARM_DECL nodes. */ |
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164 | extern void make_decl_rtl PROTO((tree, char *, int)); |
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165 | |
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166 | /* Make the rtl for variable VAR be volatile. |
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167 | Use this only for static variables. */ |
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168 | extern void make_var_volatile PROTO((tree)); |
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169 | |
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170 | /* Output alignment directive to align for constant expression EXP. */ |
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171 | extern void assemble_constant_align PROTO((tree)); |
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172 | |
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173 | /* Output a string of literal assembler code |
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174 | for an `asm' keyword used between functions. */ |
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175 | extern void assemble_asm PROTO((tree)); |
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176 | |
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177 | /* Record an element in the table of global destructors. |
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178 | How this is done depends on what sort of assembler and linker |
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179 | are in use. |
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180 | |
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181 | NAME should be the name of a global function to be called |
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182 | at exit time. This name is output using assemble_name. */ |
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183 | extern void assemble_destructor PROTO((char *)); |
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184 | |
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185 | /* Likewise for global constructors. */ |
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186 | extern void assemble_constructor PROTO((char *)); |
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187 | |
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188 | /* Likewise for entries we want to record for garbage collection. |
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189 | Garbage collection is still under development. */ |
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190 | extern void assemble_gc_entry PROTO((char *)); |
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191 | |
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192 | /* Output assembler code for the constant pool of a function and associated |
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193 | with defining the name of the function. DECL describes the function. |
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194 | NAME is the function's name. For the constant pool, we use the current |
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195 | constant pool data. */ |
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196 | extern void assemble_start_function PROTO((tree, char *)); |
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197 | |
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198 | /* Output assembler code associated with defining the size of the |
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199 | function. DECL describes the function. NAME is the function's name. */ |
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200 | extern void assemble_end_function PROTO((tree, char *)); |
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201 | |
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202 | /* Assemble code to leave SIZE bytes of zeros. */ |
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203 | extern void assemble_zeros PROTO((int)); |
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204 | |
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205 | /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */ |
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206 | extern void assemble_align PROTO((int)); |
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207 | |
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208 | /* Assemble a string constant with the specified C string as contents. */ |
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209 | extern void assemble_string PROTO((char *, int)); |
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210 | /* Assemble everything that is needed for a variable or function declaration. |
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211 | Not used for automatic variables, and not used for function definitions. |
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212 | Should not be called for variables of incomplete structure type. |
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213 | |
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214 | TOP_LEVEL is nonzero if this variable has file scope. |
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215 | AT_END is nonzero if this is the special handling, at end of compilation, |
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216 | to define things that have had only tentative definitions. |
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217 | DONT_OUTPUT_DATA if nonzero means don't actually output the |
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218 | initial value (that will be done by the caller). */ |
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219 | extern void assemble_variable PROTO((tree, int, int, int)); |
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220 | |
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221 | /* Output text storage for constructor CONSTR. */ |
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222 | extern void bc_output_constructor PROTO((tree, int)); |
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223 | |
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224 | /* Create storage for constructor CONSTR. */ |
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225 | extern void bc_output_data_constructor PROTO((tree)); |
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226 | |
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227 | /* Output something to declare an external symbol to the assembler. |
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228 | (Most assemblers don't need this, so we normally output nothing.) |
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229 | Do nothing if DECL is not external. */ |
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230 | extern void assemble_external PROTO((tree)); |
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231 | #endif |
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232 | |
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233 | #ifdef RTX_CODE |
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234 | /* Similar, for calling a library function FUN. */ |
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235 | extern void assemble_external_libcall PROTO((rtx)); |
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236 | #endif |
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237 | |
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238 | /* Declare the label NAME global. */ |
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239 | extern void assemble_global PROTO((char *)); |
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240 | |
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241 | /* Assemble a label named NAME. */ |
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242 | extern void assemble_label PROTO((char *)); |
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243 | |
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244 | /* Output to FILE a reference to the assembler name of a C-level name NAME. |
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245 | If NAME starts with a *, the rest of NAME is output verbatim. |
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246 | Otherwise NAME is transformed in an implementation-defined way |
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247 | (usually by the addition of an underscore). |
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248 | Many macros in the tm file are defined to call this function. */ |
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249 | extern void assemble_name STDIO_PROTO((FILE *, char *)); |
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250 | |
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251 | #ifdef RTX_CODE |
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252 | /* Assemble the integer constant X into an object of SIZE bytes. |
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253 | X must be either a CONST_INT or CONST_DOUBLE. |
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254 | |
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255 | Return 1 if we were able to output the constant, otherwise 0. If FORCE is |
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256 | non-zero, abort if we can't output the constant. */ |
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257 | extern int assemble_integer PROTO((rtx, int, int)); |
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258 | |
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259 | #ifdef EMUSHORT |
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260 | /* Assemble the floating-point constant D into an object of size MODE. */ |
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261 | extern void assemble_real PROTO((REAL_VALUE_TYPE, |
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262 | enum machine_mode)); |
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263 | #endif |
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264 | #endif |
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265 | |
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266 | /* At the end of a function, forget the memory-constants |
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267 | previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain. |
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268 | Also clear out real_constant_chain and clear out all the chain-pointers. */ |
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269 | extern void clear_const_double_mem PROTO((void)); |
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270 | |
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271 | /* Start deferring output of subconstants. */ |
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272 | extern void defer_addressed_constants PROTO((void)); |
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273 | |
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274 | /* Stop deferring output of subconstants, |
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275 | and output now all those that have been deferred. */ |
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276 | extern void output_deferred_addressed_constants PROTO((void)); |
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277 | |
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278 | /* Initialize constant pool hashing for next function. */ |
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279 | extern void init_const_rtx_hash_table PROTO((void)); |
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280 | |
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281 | /* Return the size of the constant pool. */ |
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282 | extern int get_pool_size PROTO((void)); |
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283 | |
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284 | #ifdef TREE_CODE |
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285 | /* Write all the constants in the constant pool. */ |
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286 | extern void output_constant_pool PROTO((char *, tree)); |
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287 | |
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288 | /* Output assembler code for constant EXP to FILE, with no label. |
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289 | This includes the pseudo-op such as ".int" or ".byte", and a newline. |
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290 | Assumes output_addressed_constants has been done on EXP already. |
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291 | |
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292 | Generate exactly SIZE bytes of assembler data, padding at the end |
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293 | with zeros if necessary. SIZE must always be specified. */ |
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294 | extern void output_constant PROTO((tree, int)); |
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295 | #endif |
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296 | |
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297 | /* When outputting assembler code, indicates which alternative |
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298 | of the constraints was actually satisfied. */ |
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299 | extern int which_alternative; |
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300 | |
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301 | #ifdef RTX_CODE |
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302 | /* When outputting delayed branch sequences, this rtx holds the |
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303 | sequence being output. It is null when no delayed branch |
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304 | sequence is being output, so it can be used as a test in the |
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305 | insn output code. |
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306 | |
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307 | This variable is defined in final.c. */ |
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308 | extern rtx final_sequence; |
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309 | #endif |
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310 | |
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311 | /* Number of bytes of args popped by function being compiled on its return. |
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312 | Zero if no bytes are to be popped. |
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313 | May affect compilation of return insn or of function epilogue. */ |
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314 | |
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315 | extern int current_function_pops_args; |
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316 | |
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317 | /* Nonzero if function being compiled needs to be given an address |
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318 | where the value should be stored. */ |
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319 | |
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320 | extern int current_function_returns_struct; |
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321 | |
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322 | /* Nonzero if function being compiled needs to |
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323 | return the address of where it has put a structure value. */ |
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324 | |
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325 | extern int current_function_returns_pcc_struct; |
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326 | |
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327 | /* Nonzero if function being compiled needs to be passed a static chain. */ |
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328 | |
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329 | extern int current_function_needs_context; |
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330 | |
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331 | /* Nonzero if function being compiled can call setjmp. */ |
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332 | |
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333 | extern int current_function_calls_setjmp; |
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334 | |
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335 | /* Nonzero if function being compiled can call longjmp. */ |
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336 | |
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337 | extern int current_function_calls_longjmp; |
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338 | |
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339 | /* Nonzero if function being compiled can call alloca, |
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340 | either as a subroutine or builtin. */ |
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341 | |
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342 | extern int current_function_calls_alloca; |
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343 | |
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344 | /* Nonzero if function being compiled receives nonlocal gotos |
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345 | from nested functions. */ |
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346 | |
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347 | extern int current_function_has_nonlocal_label; |
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348 | |
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349 | /* Nonzero if function being compiled contains nested functions. */ |
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350 | |
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351 | extern int current_function_contains_functions; |
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352 | |
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353 | /* Nonzero if the current function returns a pointer type */ |
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354 | |
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355 | extern int current_function_returns_pointer; |
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356 | |
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357 | /* If function's args have a fixed size, this is that size, in bytes. |
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358 | Otherwise, it is -1. |
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359 | May affect compilation of return insn or of function epilogue. */ |
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360 | |
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361 | extern int current_function_args_size; |
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362 | |
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363 | /* # bytes the prologue should push and pretend that the caller pushed them. |
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364 | The prologue must do this, but only if parms can be passed in registers. */ |
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365 | |
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366 | extern int current_function_pretend_args_size; |
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367 | |
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368 | /* # of bytes of outgoing arguments required to be pushed by the prologue. |
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369 | If this is non-zero, it means that ACCUMULATE_OUTGOING_ARGS was defined |
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370 | and no stack adjusts will be done on function calls. */ |
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371 | |
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372 | extern int current_function_outgoing_args_size; |
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373 | |
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374 | /* Nonzero if current function uses varargs.h or equivalent. |
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375 | Zero for functions that use stdarg.h. */ |
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376 | |
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377 | extern int current_function_varargs; |
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378 | |
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379 | /* Nonzero if current function uses stdarg.h or equivalent. |
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380 | Zero for functions that use varargs.h. */ |
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381 | |
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382 | extern int current_function_stdarg; |
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383 | |
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384 | /* Quantities of various kinds of registers |
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385 | used for the current function's args. */ |
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386 | |
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387 | extern CUMULATIVE_ARGS current_function_args_info; |
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388 | |
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389 | /* Name of function now being compiled. */ |
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390 | |
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391 | extern char *current_function_name; |
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392 | |
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393 | #ifdef RTX_CODE |
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394 | /* If non-zero, an RTL expression for that location at which the current |
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395 | function returns its result. Usually equal to |
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396 | DECL_RTL (DECL_RESULT (current_function_decl)). */ |
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397 | |
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398 | extern rtx current_function_return_rtx; |
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399 | |
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400 | /* If some insns can be deferred to the delay slots of the epilogue, the |
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401 | delay list for them is recorded here. */ |
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402 | |
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403 | extern rtx current_function_epilogue_delay_list; |
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404 | #endif |
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405 | |
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406 | /* Nonzero means generate position-independent code. |
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407 | This is not fully implemented yet. */ |
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408 | |
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409 | extern int flag_pic; |
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410 | |
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411 | /* This is nonzero if the current function uses pic_offset_table_rtx. */ |
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412 | extern int current_function_uses_pic_offset_table; |
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413 | |
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414 | /* This is nonzero if the current function uses the constant pool. */ |
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415 | extern int current_function_uses_const_pool; |
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416 | |
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417 | /* The line number of the beginning of the current function. |
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418 | sdbout.c needs this so that it can output relative linenumbers. */ |
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419 | |
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420 | #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers. */ |
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421 | extern int sdb_begin_function_line; |
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422 | #endif |
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423 | |
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424 | /* File in which assembler code is being written. */ |
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425 | |
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426 | #ifdef BUFSIZ |
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427 | extern FILE *asm_out_file; |
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428 | #endif |
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