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111
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1 /* go-lang.c -- Go frontend gcc interface.
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2 Copyright (C) 2009-2017 Free Software Foundation, Inc.
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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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42 /* Language-dependent contents of a type. */
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43
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44 struct GTY(()) lang_type
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45 {
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46 char dummy;
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47 };
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48
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49 /* Language-dependent contents of a decl. */
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50
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51 struct GTY(()) lang_decl
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52 {
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53 char dummy;
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54 };
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55
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56 /* Language-dependent contents of an identifier. This must include a
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57 tree_identifier. */
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58
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59 struct GTY(()) lang_identifier
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60 {
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61 struct tree_identifier common;
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62 };
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63
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64 /* The resulting tree type. */
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65
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66 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
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67 chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
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68 lang_tree_node
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69 {
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70 union tree_node GTY((tag ("0"),
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71 desc ("tree_node_structure (&%h)"))) generic;
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72 struct lang_identifier GTY((tag ("1"))) identifier;
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73 };
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74
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75 /* We don't use language_function. */
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76
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77 struct GTY(()) language_function
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78 {
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79 int dummy;
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80 };
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81
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82 /* Option information we need to pass to go_create_gogo. */
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83
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84 static const char *go_pkgpath = NULL;
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85 static const char *go_prefix = NULL;
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86 static const char *go_relative_import_path = NULL;
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87 static const char *go_c_header = NULL;
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88
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89 /* Language hooks. */
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90
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91 static bool
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92 go_langhook_init (void)
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93 {
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94 build_common_tree_nodes (false);
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95
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96 /* I don't know why this has to be done explicitly. */
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97 void_list_node = build_tree_list (NULL_TREE, void_type_node);
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98
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99 /* We must create the gogo IR after calling build_common_tree_nodes
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100 (because Gogo::define_builtin_function_trees refers indirectly
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101 to, e.g., unsigned_char_type_node) but before calling
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102 build_common_builtin_nodes (because it calls, indirectly,
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103 go_type_for_size). */
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104 struct go_create_gogo_args args;
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105 args.int_type_size = INT_TYPE_SIZE;
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106 args.pointer_size = POINTER_SIZE;
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107 args.pkgpath = go_pkgpath;
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108 args.prefix = go_prefix;
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109 args.relative_import_path = go_relative_import_path;
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110 args.c_header = go_c_header;
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111 args.check_divide_by_zero = go_check_divide_zero;
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112 args.check_divide_overflow = go_check_divide_overflow;
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113 args.compiling_runtime = go_compiling_runtime;
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114 args.debug_escape_level = go_debug_escape_level;
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115 args.linemap = go_get_linemap();
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116 args.backend = go_get_backend();
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117 go_create_gogo (&args);
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118
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119 build_common_builtin_nodes ();
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120
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121 /* The default precision for floating point numbers. This is used
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122 for floating point constants with abstract type. This may
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123 eventually be controllable by a command line option. */
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124 mpfr_set_default_prec (256);
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125
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126 /* Go uses exceptions. */
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127 using_eh_for_cleanups ();
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128
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129 return true;
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130 }
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131
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132 /* The option mask. */
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133
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134 static unsigned int
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135 go_langhook_option_lang_mask (void)
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136 {
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137 return CL_Go;
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138 }
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139
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140 /* Initialize the options structure. */
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141
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142 static void
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143 go_langhook_init_options_struct (struct gcc_options *opts)
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144 {
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145 /* Go says that signed overflow is precisely defined. */
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146 opts->x_flag_wrapv = 1;
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147
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148 /* We default to using strict aliasing, since Go pointers are safe.
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149 This is turned off for code that imports the "unsafe" package,
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150 because using unsafe.pointer violates C style aliasing
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151 requirements. */
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152 opts->x_flag_strict_aliasing = 1;
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153
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154 /* Default to avoiding range issues for complex multiply and
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155 divide. */
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156 opts->x_flag_complex_method = 2;
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157
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158 /* The builtin math functions should not set errno. */
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159 opts->x_flag_errno_math = 0;
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160 opts->frontend_set_flag_errno_math = true;
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161
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162 /* Exceptions are used to handle recovering from panics. */
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163 opts->x_flag_exceptions = 1;
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164 opts->x_flag_non_call_exceptions = 1;
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165
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166 /* We need to keep pointers live for the garbage collector. */
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167 opts->x_flag_keep_gc_roots_live = 1;
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168
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169 /* Go programs expect runtime.Callers to work, and that uses
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170 libbacktrace that uses debug info. Set the debug info level to 1
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171 by default. In post_options we will set the debug type if the
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172 debug info level was not set back to 0 on the command line. */
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173 opts->x_debug_info_level = DINFO_LEVEL_TERSE;
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174 }
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175
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176 /* Infrastructure for a vector of char * pointers. */
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177
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178 typedef const char *go_char_p;
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179
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180 /* The list of directories to search after all the Go specific
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181 directories have been searched. */
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182
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183 static vec<go_char_p> go_search_dirs;
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184
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185 /* Handle Go specific options. Return 0 if we didn't do anything. */
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186
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187 static bool
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188 go_langhook_handle_option (
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189 size_t scode,
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190 const char *arg,
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191 int value ATTRIBUTE_UNUSED,
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192 int kind ATTRIBUTE_UNUSED,
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193 location_t loc ATTRIBUTE_UNUSED,
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194 const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
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195 {
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196 enum opt_code code = (enum opt_code) scode;
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197 bool ret = true;
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198
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199 switch (code)
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200 {
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201 case OPT_I:
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202 go_add_search_path (arg);
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203 break;
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204
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205 case OPT_L:
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206 /* A -L option is assumed to come from the compiler driver.
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207 This is a system directory. We search the following
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208 directories, if they exist, before this one:
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209 dir/go/VERSION
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210 dir/go/VERSION/MACHINE
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211 This is like include/c++. */
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212 {
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213 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
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214 size_t len;
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215 char *p;
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216 struct stat st;
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217
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218 len = strlen (arg);
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219 p = XALLOCAVEC (char,
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220 (len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
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221 + sizeof DEFAULT_TARGET_MACHINE + 3));
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222 strcpy (p, arg);
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223 if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
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224 strcat (p, dir_separator_str);
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225 strcat (p, "go");
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226 strcat (p, dir_separator_str);
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227 strcat (p, DEFAULT_TARGET_VERSION);
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228 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
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229 {
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230 go_add_search_path (p);
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231 strcat (p, dir_separator_str);
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232 strcat (p, DEFAULT_TARGET_MACHINE);
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233 if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
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234 go_add_search_path (p);
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235 }
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236
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237 /* Search ARG too, but only after we've searched to Go
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238 specific directories for all -L arguments. */
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239 go_search_dirs.safe_push (arg);
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240 }
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241 break;
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242
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243 case OPT_fgo_dump_:
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244 ret = go_enable_dump (arg) ? true : false;
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245 break;
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246
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247 case OPT_fgo_optimize_:
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248 ret = go_enable_optimize (arg) ? true : false;
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249 break;
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250
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251 case OPT_fgo_pkgpath_:
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252 go_pkgpath = arg;
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253 break;
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254
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255 case OPT_fgo_prefix_:
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256 go_prefix = arg;
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257 break;
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258
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259 case OPT_fgo_relative_import_path_:
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260 go_relative_import_path = arg;
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261 break;
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262
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263 case OPT_fgo_c_header_:
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264 go_c_header = arg;
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265 break;
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266
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267 default:
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268 /* Just return 1 to indicate that the option is valid. */
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269 break;
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270 }
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271
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272 return ret;
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273 }
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274
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275 /* Run after parsing options. */
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276
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277 static bool
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278 go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
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279 {
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280 unsigned int ix;
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281 const char *dir;
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282
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283 gcc_assert (num_in_fnames > 0);
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284
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285 FOR_EACH_VEC_ELT (go_search_dirs, ix, dir)
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286 go_add_search_path (dir);
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287 go_search_dirs.release ();
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288
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289 if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
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290 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
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291
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292 /* Tail call optimizations can confuse uses of runtime.Callers. */
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293 if (!global_options_set.x_flag_optimize_sibling_calls)
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294 global_options.x_flag_optimize_sibling_calls = 0;
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295
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296 /* If the debug info level is still 1, as set in init_options, make
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297 sure that some debugging type is selected. */
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298 if (global_options.x_debug_info_level == DINFO_LEVEL_TERSE
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299 && global_options.x_write_symbols == NO_DEBUG)
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300 global_options.x_write_symbols = PREFERRED_DEBUGGING_TYPE;
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301
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302 /* We turn on stack splitting if we can. */
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303 if (!global_options_set.x_flag_split_stack
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304 && targetm_common.supports_split_stack (false, &global_options))
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305 global_options.x_flag_split_stack = 1;
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306
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307 /* If stack splitting is turned on, and the user did not explicitly
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308 request function partitioning, turn off partitioning, as it
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309 confuses the linker when trying to handle partitioned split-stack
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310 code that calls a non-split-stack function. */
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311 if (global_options.x_flag_split_stack
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312 && global_options.x_flag_reorder_blocks_and_partition
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313 && !global_options_set.x_flag_reorder_blocks_and_partition)
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314 global_options.x_flag_reorder_blocks_and_partition = 0;
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315
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316 /* Returning false means that the backend should be used. */
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317 return false;
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318 }
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319
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320 static void
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321 go_langhook_parse_file (void)
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322 {
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323 go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
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324 go_require_return_statement);
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325
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326 /* Final processing of globals and early debug info generation. */
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327 go_write_globals ();
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328 }
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329
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330 static tree
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331 go_langhook_type_for_size (unsigned int bits, int unsignedp)
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332 {
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333 tree type;
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334 if (unsignedp)
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335 {
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336 if (bits == INT_TYPE_SIZE)
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337 type = unsigned_type_node;
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338 else if (bits == CHAR_TYPE_SIZE)
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339 type = unsigned_char_type_node;
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340 else if (bits == SHORT_TYPE_SIZE)
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341 type = short_unsigned_type_node;
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342 else if (bits == LONG_TYPE_SIZE)
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343 type = long_unsigned_type_node;
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344 else if (bits == LONG_LONG_TYPE_SIZE)
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345 type = long_long_unsigned_type_node;
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346 else
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347 type = make_unsigned_type(bits);
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348 }
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349 else
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350 {
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351 if (bits == INT_TYPE_SIZE)
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352 type = integer_type_node;
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353 else if (bits == CHAR_TYPE_SIZE)
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354 type = signed_char_type_node;
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355 else if (bits == SHORT_TYPE_SIZE)
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356 type = short_integer_type_node;
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357 else if (bits == LONG_TYPE_SIZE)
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358 type = long_integer_type_node;
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359 else if (bits == LONG_LONG_TYPE_SIZE)
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360 type = long_long_integer_type_node;
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361 else
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362 type = make_signed_type(bits);
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363 }
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364 return type;
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365 }
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366
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367 static tree
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368 go_langhook_type_for_mode (machine_mode mode, int unsignedp)
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369 {
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370 tree type;
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371 /* Go has no vector types. Build them here. FIXME: It does not
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372 make sense for the middle-end to ask the frontend for a type
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373 which the frontend does not support. However, at least for now
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374 it is required. See PR 46805. */
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375 if (VECTOR_MODE_P (mode))
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376 {
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377 tree inner;
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378
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379 inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
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380 if (inner != NULL_TREE)
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381 return build_vector_type_for_mode (inner, mode);
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382 return NULL_TREE;
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383 }
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384
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385 scalar_int_mode imode;
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386 scalar_float_mode fmode;
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387 complex_mode cmode;
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388 if (is_int_mode (mode, &imode))
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389 return go_langhook_type_for_size (GET_MODE_BITSIZE (imode), unsignedp);
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390 else if (is_float_mode (mode, &fmode))
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391 {
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392 switch (GET_MODE_BITSIZE (fmode))
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393 {
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394 case 32:
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395 return float_type_node;
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396 case 64:
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397 return double_type_node;
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398 default:
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399 // We have to check for long double in order to support
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400 // i386 excess precision.
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401 if (fmode == TYPE_MODE(long_double_type_node))
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402 return long_double_type_node;
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403 }
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404 }
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405 else if (is_complex_float_mode (mode, &cmode))
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406 {
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407 switch (GET_MODE_BITSIZE (cmode))
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408 {
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409 case 64:
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410 return complex_float_type_node;
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411 case 128:
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412 return complex_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 (cmode == TYPE_MODE(complex_long_double_type_node))
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417 return complex_long_double_type_node;
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418 }
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419 }
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420
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421 #if HOST_BITS_PER_WIDE_INT >= 64
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422 /* The middle-end and some backends rely on TImode being supported
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423 for 64-bit HWI. */
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424 if (mode == TImode)
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425 {
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426 type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
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427 unsignedp);
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428 if (type && TYPE_MODE (type) == TImode)
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429 return type;
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|
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430 }
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431 #endif
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432 return NULL_TREE;
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433 }
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434
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435 /* Record a builtin function. We just ignore builtin functions. */
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436
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437 static tree
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438 go_langhook_builtin_function (tree decl)
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439 {
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440 return decl;
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|
|
441 }
|
|
|
442
|
|
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443 /* Return true if we are in the global binding level. */
|
|
|
444
|
|
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445 static bool
|
|
|
446 go_langhook_global_bindings_p (void)
|
|
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447 {
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|
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448 return current_function_decl == NULL_TREE;
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|
|
449 }
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|
|
450
|
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|
451 /* Push a declaration into the current binding level. We can't
|
|
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452 usefully implement this since we don't want to convert from tree
|
|
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453 back to one of our internal data structures. I think the only way
|
|
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454 this is used is to record a decl which is to be returned by
|
|
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455 getdecls, and we could implement it for that purpose if
|
|
|
456 necessary. */
|
|
|
457
|
|
|
458 static tree
|
|
|
459 go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
|
|
|
460 {
|
|
|
461 gcc_unreachable ();
|
|
|
462 }
|
|
|
463
|
|
|
464 /* This hook is used to get the current list of declarations as trees.
|
|
|
465 We don't support that; instead we use the write_globals hook. This
|
|
|
466 can't simply crash because it is called by -gstabs. */
|
|
|
467
|
|
|
468 static tree
|
|
|
469 go_langhook_getdecls (void)
|
|
|
470 {
|
|
|
471 return NULL;
|
|
|
472 }
|
|
|
473
|
|
|
474 /* Go specific gimplification. We need to gimplify
|
|
|
475 CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
|
|
|
476 it. */
|
|
|
477
|
|
|
478 static int
|
|
|
479 go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
|
|
|
480 {
|
|
|
481 if (TREE_CODE (*expr_p) == CALL_EXPR
|
|
|
482 && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
|
|
|
483 gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
|
|
|
484 is_gimple_val, fb_rvalue);
|
|
|
485 return GS_UNHANDLED;
|
|
|
486 }
|
|
|
487
|
|
|
488 /* Return a decl for the exception personality function. The function
|
|
|
489 itself is implemented in libgo/runtime/go-unwind.c. */
|
|
|
490
|
|
|
491 static tree
|
|
|
492 go_langhook_eh_personality (void)
|
|
|
493 {
|
|
|
494 static tree personality_decl;
|
|
|
495 if (personality_decl == NULL_TREE)
|
|
|
496 {
|
|
|
497 personality_decl = build_personality_function ("gccgo");
|
|
|
498 go_preserve_from_gc (personality_decl);
|
|
|
499 }
|
|
|
500 return personality_decl;
|
|
|
501 }
|
|
|
502
|
|
|
503 /* Functions called directly by the generic backend. */
|
|
|
504
|
|
|
505 tree
|
|
|
506 convert (tree type, tree expr)
|
|
|
507 {
|
|
|
508 if (type == error_mark_node
|
|
|
509 || expr == error_mark_node
|
|
|
510 || TREE_TYPE (expr) == error_mark_node)
|
|
|
511 return error_mark_node;
|
|
|
512
|
|
|
513 if (type == TREE_TYPE (expr))
|
|
|
514 return expr;
|
|
|
515
|
|
|
516 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
|
|
|
517 return fold_convert (type, expr);
|
|
|
518
|
|
|
519 switch (TREE_CODE (type))
|
|
|
520 {
|
|
|
521 case VOID_TYPE:
|
|
|
522 case BOOLEAN_TYPE:
|
|
|
523 return fold_convert (type, expr);
|
|
|
524 case INTEGER_TYPE:
|
|
|
525 return fold (convert_to_integer (type, expr));
|
|
|
526 case POINTER_TYPE:
|
|
|
527 return fold (convert_to_pointer (type, expr));
|
|
|
528 case REAL_TYPE:
|
|
|
529 return fold (convert_to_real (type, expr));
|
|
|
530 case COMPLEX_TYPE:
|
|
|
531 return fold (convert_to_complex (type, expr));
|
|
|
532 default:
|
|
|
533 break;
|
|
|
534 }
|
|
|
535
|
|
|
536 gcc_unreachable ();
|
|
|
537 }
|
|
|
538
|
|
|
539 /* FIXME: This is a hack to preserve trees that we create from the
|
|
|
540 garbage collector. */
|
|
|
541
|
|
|
542 static GTY(()) tree go_gc_root;
|
|
|
543
|
|
|
544 void
|
|
|
545 go_preserve_from_gc (tree t)
|
|
|
546 {
|
|
|
547 go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
|
|
|
548 }
|
|
|
549
|
|
|
550 /* Convert an identifier for use in an error message. */
|
|
|
551
|
|
|
552 const char *
|
|
|
553 go_localize_identifier (const char *ident)
|
|
|
554 {
|
|
|
555 return identifier_to_locale (ident);
|
|
|
556 }
|
|
|
557
|
|
|
558 #undef LANG_HOOKS_NAME
|
|
|
559 #undef LANG_HOOKS_INIT
|
|
|
560 #undef LANG_HOOKS_OPTION_LANG_MASK
|
|
|
561 #undef LANG_HOOKS_INIT_OPTIONS_STRUCT
|
|
|
562 #undef LANG_HOOKS_HANDLE_OPTION
|
|
|
563 #undef LANG_HOOKS_POST_OPTIONS
|
|
|
564 #undef LANG_HOOKS_PARSE_FILE
|
|
|
565 #undef LANG_HOOKS_TYPE_FOR_MODE
|
|
|
566 #undef LANG_HOOKS_TYPE_FOR_SIZE
|
|
|
567 #undef LANG_HOOKS_BUILTIN_FUNCTION
|
|
|
568 #undef LANG_HOOKS_GLOBAL_BINDINGS_P
|
|
|
569 #undef LANG_HOOKS_PUSHDECL
|
|
|
570 #undef LANG_HOOKS_GETDECLS
|
|
|
571 #undef LANG_HOOKS_GIMPLIFY_EXPR
|
|
|
572 #undef LANG_HOOKS_EH_PERSONALITY
|
|
|
573
|
|
|
574 #define LANG_HOOKS_NAME "GNU Go"
|
|
|
575 #define LANG_HOOKS_INIT go_langhook_init
|
|
|
576 #define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
|
|
|
577 #define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
|
|
|
578 #define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
|
|
|
579 #define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
|
|
|
580 #define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
|
|
|
581 #define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
|
|
|
582 #define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
|
|
|
583 #define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
|
|
|
584 #define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
|
|
|
585 #define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
|
|
|
586 #define LANG_HOOKS_GETDECLS go_langhook_getdecls
|
|
|
587 #define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
|
|
|
588 #define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
|
|
|
589
|
|
|
590 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
|
|
|
591
|
|
|
592 #include "gt-go-go-lang.h"
|
|
|
593 #include "gtype-go.h"
|
