111
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1 /* go-lang.c -- Go frontend gcc interface.
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131
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2 Copyright (C) 2009-2018 Free Software Foundation, Inc.
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111
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 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 GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "target.h"
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24 #include "tree.h"
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25 #include "gimple-expr.h"
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26 #include "diagnostic.h"
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27 #include "opts.h"
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28 #include "fold-const.h"
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29 #include "gimplify.h"
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30 #include "stor-layout.h"
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31 #include "debug.h"
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32 #include "convert.h"
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33 #include "langhooks.h"
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34 #include "langhooks-def.h"
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35 #include "common/common-target.h"
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36
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37 #include <mpfr.h>
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38
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39 #include "go-c.h"
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40 #include "go-gcc.h"
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41
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131
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42 #ifndef TARGET_AIX
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43 #define TARGET_AIX 0
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44 #endif
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45
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111
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46 /* Language-dependent contents of a type. */
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47
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48 struct GTY(()) lang_type
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49 {
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50 char dummy;
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51 };
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52
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53 /* Language-dependent contents of a decl. */
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54
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55 struct GTY(()) lang_decl
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56 {
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57 char dummy;
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58 };
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59
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60 /* Language-dependent contents of an identifier. This must include a
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61 tree_identifier. */
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62
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63 struct GTY(()) lang_identifier
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64 {
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65 struct tree_identifier common;
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66 };
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67
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68 /* The resulting tree type. */
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69
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70 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
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71 chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
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72 lang_tree_node
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73 {
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74 union tree_node GTY((tag ("0"),
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75 desc ("tree_node_structure (&%h)"))) generic;
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76 struct lang_identifier GTY((tag ("1"))) identifier;
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77 };
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78
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79 /* We don't use language_function. */
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80
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81 struct GTY(()) language_function
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82 {
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83 int dummy;
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84 };
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85
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86 /* Option information we need to pass to go_create_gogo. */
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87
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88 static const char *go_pkgpath = NULL;
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89 static const char *go_prefix = NULL;
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90 static const char *go_relative_import_path = NULL;
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91 static const char *go_c_header = NULL;
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92
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93 /* Language hooks. */
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94
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95 static bool
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96 go_langhook_init (void)
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97 {
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98 build_common_tree_nodes (false);
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99
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100 /* I don't know why this has to be done explicitly. */
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101 void_list_node = build_tree_list (NULL_TREE, void_type_node);
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102
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103 /* We must create the gogo IR after calling build_common_tree_nodes
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104 (because Gogo::define_builtin_function_trees refers indirectly
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105 to, e.g., unsigned_char_type_node) but before calling
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106 build_common_builtin_nodes (because it calls, indirectly,
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107 go_type_for_size). */
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108 struct go_create_gogo_args args;
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109 args.int_type_size = INT_TYPE_SIZE;
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110 args.pointer_size = POINTER_SIZE;
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111 args.pkgpath = go_pkgpath;
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112 args.prefix = go_prefix;
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113 args.relative_import_path = go_relative_import_path;
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114 args.c_header = go_c_header;
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115 args.check_divide_by_zero = go_check_divide_zero;
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116 args.check_divide_overflow = go_check_divide_overflow;
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117 args.compiling_runtime = go_compiling_runtime;
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118 args.debug_escape_level = go_debug_escape_level;
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131
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119 args.debug_escape_hash = go_debug_escape_hash;
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120 args.nil_check_size_threshold = TARGET_AIX ? -1 : 4096;
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111
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121 args.linemap = go_get_linemap();
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122 args.backend = go_get_backend();
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123 go_create_gogo (&args);
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124
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125 build_common_builtin_nodes ();
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126
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127 /* The default precision for floating point numbers. This is used
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128 for floating point constants with abstract type. This may
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129 eventually be controllable by a command line option. */
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130 mpfr_set_default_prec (256);
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131
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132 /* Go uses exceptions. */
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133 using_eh_for_cleanups ();
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134
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135 return true;
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136 }
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137
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138 /* The option mask. */
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139
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140 static unsigned int
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141 go_langhook_option_lang_mask (void)
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142 {
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143 return CL_Go;
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144 }
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145
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146 /* Initialize the options structure. */
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147
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148 static void
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149 go_langhook_init_options_struct (struct gcc_options *opts)
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150 {
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151 /* Go says that signed overflow is precisely defined. */
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152 opts->x_flag_wrapv = 1;
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153
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154 /* We default to using strict aliasing, since Go pointers are safe.
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155 This is turned off for code that imports the "unsafe" package,
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156 because using unsafe.pointer violates C style aliasing
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157 requirements. */
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158 opts->x_flag_strict_aliasing = 1;
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159
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160 /* Default to avoiding range issues for complex multiply and
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161 divide. */
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162 opts->x_flag_complex_method = 2;
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163
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164 /* The builtin math functions should not set errno. */
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165 opts->x_flag_errno_math = 0;
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166 opts->frontend_set_flag_errno_math = true;
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167
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168 /* Exceptions are used to handle recovering from panics. */
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169 opts->x_flag_exceptions = 1;
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170 opts->x_flag_non_call_exceptions = 1;
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171
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172 /* We need to keep pointers live for the garbage collector. */
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173 opts->x_flag_keep_gc_roots_live = 1;
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174
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175 /* Go programs expect runtime.Callers to work, and that uses
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176 libbacktrace that uses debug info. Set the debug info level to 1
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177 by default. In post_options we will set the debug type if the
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178 debug info level was not set back to 0 on the command line. */
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179 opts->x_debug_info_level = DINFO_LEVEL_TERSE;
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180 }
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181
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182 /* Infrastructure for a vector of char * pointers. */
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183
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184 typedef const char *go_char_p;
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185
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186 /* The list of directories to search after all the Go specific
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187 directories have been searched. */
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188
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189 static vec<go_char_p> go_search_dirs;
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190
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191 /* Handle Go specific options. Return 0 if we didn't do anything. */
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192
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193 static bool
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194 go_langhook_handle_option (
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195 size_t scode,
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196 const char *arg,
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131
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197 HOST_WIDE_INT value,
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111
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198 int kind ATTRIBUTE_UNUSED,
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199 location_t loc ATTRIBUTE_UNUSED,
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200 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
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201 {
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202 enum opt_code code = (enum opt_code) scode;
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203 bool ret = true;
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204
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205 switch (code)
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206 {
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207 case OPT_I:
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208 go_add_search_path (arg);
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209 break;
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210
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211 case OPT_L:
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212 /* A -L option is assumed to come from the compiler driver.
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213 This is a system directory. We search the following
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214 directories, if they exist, before this one:
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215 dir/go/VERSION
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216 dir/go/VERSION/MACHINE
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217 This is like include/c++. */
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218 {
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219 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
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220 size_t len;
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221 char *p;
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222 struct stat st;
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223
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224 len = strlen (arg);
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225 p = XALLOCAVEC (char,
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226 (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
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227 + sizeof DEFAULT_TARGET_MACHINE + 3));
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228 strcpy (p, arg);
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229 if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
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230 strcat (p, dir_separator_str);
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231 strcat (p, "go");
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232 strcat (p, dir_separator_str);
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233 strcat (p, DEFAULT_TARGET_VERSION);
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234 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
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235 {
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236 go_add_search_path (p);
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237 strcat (p, dir_separator_str);
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238 strcat (p, DEFAULT_TARGET_MACHINE);
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239 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
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240 go_add_search_path (p);
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241 }
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242
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243 /* Search ARG too, but only after we've searched to Go
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244 specific directories for all -L arguments. */
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245 go_search_dirs.safe_push (arg);
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246 }
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247 break;
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248
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249 case OPT_fgo_dump_:
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250 ret = go_enable_dump (arg) ? true : false;
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251 break;
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252
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253 case OPT_fgo_optimize_:
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131
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254 ret = go_enable_optimize (arg, value) ? true : false;
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111
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255 break;
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256
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257 case OPT_fgo_pkgpath_:
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258 go_pkgpath = arg;
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259 break;
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260
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261 case OPT_fgo_prefix_:
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262 go_prefix = arg;
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263 break;
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264
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265 case OPT_fgo_relative_import_path_:
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266 go_relative_import_path = arg;
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267 break;
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268
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269 case OPT_fgo_c_header_:
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270 go_c_header = arg;
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271 break;
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272
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273 default:
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274 /* Just return 1 to indicate that the option is valid. */
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275 break;
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276 }
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277
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278 return ret;
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279 }
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280
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281 /* Run after parsing options. */
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282
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283 static bool
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284 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
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285 {
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286 unsigned int ix;
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287 const char *dir;
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288
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289 gcc_assert (num_in_fnames > 0);
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290
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291 FOR_EACH_VEC_ELT (go_search_dirs, ix, dir)
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292 go_add_search_path (dir);
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293 go_search_dirs.release ();
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294
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295 if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
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296 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
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297
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298 /* Tail call optimizations can confuse uses of runtime.Callers. */
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299 if (!global_options_set.x_flag_optimize_sibling_calls)
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300 global_options.x_flag_optimize_sibling_calls = 0;
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301
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302 /* If the debug info level is still 1, as set in init_options, make
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303 sure that some debugging type is selected. */
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304 if (global_options.x_debug_info_level == DINFO_LEVEL_TERSE
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305 && global_options.x_write_symbols == NO_DEBUG)
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306 global_options.x_write_symbols = PREFERRED_DEBUGGING_TYPE;
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307
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308 /* We turn on stack splitting if we can. */
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309 if (!global_options_set.x_flag_split_stack
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310 && targetm_common.supports_split_stack (false, &global_options))
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311 global_options.x_flag_split_stack = 1;
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312
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313 /* If stack splitting is turned on, and the user did not explicitly
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314 request function partitioning, turn off partitioning, as it
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315 confuses the linker when trying to handle partitioned split-stack
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316 code that calls a non-split-stack function. */
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317 if (global_options.x_flag_split_stack
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318 && global_options.x_flag_reorder_blocks_and_partition
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319 && !global_options_set.x_flag_reorder_blocks_and_partition)
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320 global_options.x_flag_reorder_blocks_and_partition = 0;
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321
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322 /* Returning false means that the backend should be used. */
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323 return false;
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324 }
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325
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326 static void
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327 go_langhook_parse_file (void)
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328 {
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329 go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
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330 go_require_return_statement);
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331
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332 /* Final processing of globals and early debug info generation. */
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333 go_write_globals ();
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334 }
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335
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336 static tree
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337 go_langhook_type_for_size (unsigned int bits, int unsignedp)
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338 {
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339 tree type;
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340 if (unsignedp)
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341 {
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342 if (bits == INT_TYPE_SIZE)
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343 type = unsigned_type_node;
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344 else if (bits == CHAR_TYPE_SIZE)
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345 type = unsigned_char_type_node;
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346 else if (bits == SHORT_TYPE_SIZE)
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347 type = short_unsigned_type_node;
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348 else if (bits == LONG_TYPE_SIZE)
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349 type = long_unsigned_type_node;
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350 else if (bits == LONG_LONG_TYPE_SIZE)
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351 type = long_long_unsigned_type_node;
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352 else
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353 type = make_unsigned_type(bits);
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354 }
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355 else
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356 {
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357 if (bits == INT_TYPE_SIZE)
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358 type = integer_type_node;
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359 else if (bits == CHAR_TYPE_SIZE)
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360 type = signed_char_type_node;
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361 else if (bits == SHORT_TYPE_SIZE)
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362 type = short_integer_type_node;
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363 else if (bits == LONG_TYPE_SIZE)
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364 type = long_integer_type_node;
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365 else if (bits == LONG_LONG_TYPE_SIZE)
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366 type = long_long_integer_type_node;
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367 else
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368 type = make_signed_type(bits);
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369 }
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370 return type;
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371 }
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372
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373 static tree
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374 go_langhook_type_for_mode (machine_mode mode, int unsignedp)
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375 {
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376 tree type;
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377 /* Go has no vector types. Build them here. FIXME: It does not
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378 make sense for the middle-end to ask the frontend for a type
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379 which the frontend does not support. However, at least for now
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380 it is required. See PR 46805. */
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131
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381 if (GET_MODE_CLASS (mode) == MODE_VECTOR_BOOL
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382 && valid_vector_subparts_p (GET_MODE_NUNITS (mode)))
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383 {
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384 unsigned int elem_bits = vector_element_size (GET_MODE_BITSIZE (mode),
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385 GET_MODE_NUNITS (mode));
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386 tree bool_type = build_nonstandard_boolean_type (elem_bits);
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387 return build_vector_type_for_mode (bool_type, mode);
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388 }
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389 else if (VECTOR_MODE_P (mode)
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390 && valid_vector_subparts_p (GET_MODE_NUNITS (mode)))
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111
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391 {
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392 tree inner;
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393
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394 inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
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395 if (inner != NULL_TREE)
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396 return build_vector_type_for_mode (inner, mode);
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397 return NULL_TREE;
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398 }
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399
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400 scalar_int_mode imode;
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401 scalar_float_mode fmode;
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402 complex_mode cmode;
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403 if (is_int_mode (mode, &imode))
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404 return go_langhook_type_for_size (GET_MODE_BITSIZE (imode), unsignedp);
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405 else if (is_float_mode (mode, &fmode))
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406 {
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407 switch (GET_MODE_BITSIZE (fmode))
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408 {
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409 case 32:
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410 return float_type_node;
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411 case 64:
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412 return double_type_node;
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413 default:
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414 // We have to check for long double in order to support
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415 // i386 excess precision.
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416 if (fmode == TYPE_MODE(long_double_type_node))
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417 return long_double_type_node;
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418 }
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419 }
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420 else if (is_complex_float_mode (mode, &cmode))
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421 {
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422 switch (GET_MODE_BITSIZE (cmode))
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423 {
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424 case 64:
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425 return complex_float_type_node;
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426 case 128:
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427 return complex_double_type_node;
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428 default:
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429 // We have to check for long double in order to support
|
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430 // i386 excess precision.
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431 if (cmode == TYPE_MODE(complex_long_double_type_node))
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432 return complex_long_double_type_node;
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433 }
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434 }
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435
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436 #if HOST_BITS_PER_WIDE_INT >= 64
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437 /* The middle-end and some backends rely on TImode being supported
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438 for 64-bit HWI. */
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439 if (mode == TImode)
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440 {
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441 type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
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442 unsignedp);
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443 if (type && TYPE_MODE (type) == TImode)
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444 return type;
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445 }
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446 #endif
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447 return NULL_TREE;
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448 }
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449
|
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450 /* Record a builtin function. We just ignore builtin functions. */
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451
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452 static tree
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453 go_langhook_builtin_function (tree decl)
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454 {
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455 return decl;
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456 }
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457
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458 /* Return true if we are in the global binding level. */
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459
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460 static bool
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461 go_langhook_global_bindings_p (void)
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462 {
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463 return current_function_decl == NULL_TREE;
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464 }
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465
|
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466 /* Push a declaration into the current binding level. We can't
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467 usefully implement this since we don't want to convert from tree
|
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468 back to one of our internal data structures. I think the only way
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469 this is used is to record a decl which is to be returned by
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470 getdecls, and we could implement it for that purpose if
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471 necessary. */
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472
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473 static tree
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474 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
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475 {
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476 gcc_unreachable ();
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477 }
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478
|
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479 /* This hook is used to get the current list of declarations as trees.
|
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480 We don't support that; instead we use the write_globals hook. This
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481 can't simply crash because it is called by -gstabs. */
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482
|
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483 static tree
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484 go_langhook_getdecls (void)
|
|
485 {
|
|
486 return NULL;
|
|
487 }
|
|
488
|
|
489 /* Go specific gimplification. We need to gimplify
|
|
490 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
|
|
491 it. */
|
|
492
|
|
493 static int
|
|
494 go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
|
|
495 {
|
|
496 if (TREE_CODE (*expr_p) == CALL_EXPR
|
|
497 && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
|
|
498 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
|
|
499 is_gimple_val, fb_rvalue);
|
|
500 return GS_UNHANDLED;
|
|
501 }
|
|
502
|
|
503 /* Return a decl for the exception personality function. The function
|
|
504 itself is implemented in libgo/runtime/go-unwind.c. */
|
|
505
|
|
506 static tree
|
|
507 go_langhook_eh_personality (void)
|
|
508 {
|
|
509 static tree personality_decl;
|
|
510 if (personality_decl == NULL_TREE)
|
|
511 {
|
|
512 personality_decl = build_personality_function ("gccgo");
|
|
513 go_preserve_from_gc (personality_decl);
|
|
514 }
|
|
515 return personality_decl;
|
|
516 }
|
|
517
|
|
518 /* Functions called directly by the generic backend. */
|
|
519
|
|
520 tree
|
|
521 convert (tree type, tree expr)
|
|
522 {
|
|
523 if (type == error_mark_node
|
|
524 || expr == error_mark_node
|
|
525 || TREE_TYPE (expr) == error_mark_node)
|
|
526 return error_mark_node;
|
|
527
|
|
528 if (type == TREE_TYPE (expr))
|
|
529 return expr;
|
|
530
|
|
531 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
|
|
532 return fold_convert (type, expr);
|
|
533
|
|
534 switch (TREE_CODE (type))
|
|
535 {
|
|
536 case VOID_TYPE:
|
|
537 case BOOLEAN_TYPE:
|
|
538 return fold_convert (type, expr);
|
|
539 case INTEGER_TYPE:
|
|
540 return fold (convert_to_integer (type, expr));
|
|
541 case POINTER_TYPE:
|
|
542 return fold (convert_to_pointer (type, expr));
|
|
543 case REAL_TYPE:
|
|
544 return fold (convert_to_real (type, expr));
|
|
545 case COMPLEX_TYPE:
|
|
546 return fold (convert_to_complex (type, expr));
|
|
547 default:
|
|
548 break;
|
|
549 }
|
|
550
|
|
551 gcc_unreachable ();
|
|
552 }
|
|
553
|
|
554 /* FIXME: This is a hack to preserve trees that we create from the
|
|
555 garbage collector. */
|
|
556
|
|
557 static GTY(()) tree go_gc_root;
|
|
558
|
|
559 void
|
|
560 go_preserve_from_gc (tree t)
|
|
561 {
|
|
562 go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
|
|
563 }
|
|
564
|
|
565 /* Convert an identifier for use in an error message. */
|
|
566
|
|
567 const char *
|
|
568 go_localize_identifier (const char *ident)
|
|
569 {
|
|
570 return identifier_to_locale (ident);
|
|
571 }
|
|
572
|
|
573 #undef LANG_HOOKS_NAME
|
|
574 #undef LANG_HOOKS_INIT
|
|
575 #undef LANG_HOOKS_OPTION_LANG_MASK
|
|
576 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
|
|
577 #undef LANG_HOOKS_HANDLE_OPTION
|
|
578 #undef LANG_HOOKS_POST_OPTIONS
|
|
579 #undef LANG_HOOKS_PARSE_FILE
|
|
580 #undef LANG_HOOKS_TYPE_FOR_MODE
|
|
581 #undef LANG_HOOKS_TYPE_FOR_SIZE
|
|
582 #undef LANG_HOOKS_BUILTIN_FUNCTION
|
|
583 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
|
|
584 #undef LANG_HOOKS_PUSHDECL
|
|
585 #undef LANG_HOOKS_GETDECLS
|
|
586 #undef LANG_HOOKS_GIMPLIFY_EXPR
|
|
587 #undef LANG_HOOKS_EH_PERSONALITY
|
|
588
|
|
589 #define LANG_HOOKS_NAME "GNU Go"
|
|
590 #define LANG_HOOKS_INIT go_langhook_init
|
|
591 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
|
|
592 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
|
|
593 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
|
|
594 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
|
|
595 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
|
|
596 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
|
|
597 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
|
|
598 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
|
|
599 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
|
|
600 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
|
|
601 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
|
|
602 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
|
|
603 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
|
|
604
|
|
605 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
|
|
606
|
|
607 #include "gt-go-go-lang.h"
|
|
608 #include "gtype-go.h"
|