gcc/go/gofrontend/go.cc

   1 // go.cc -- Go frontend main file for gcc.
   2
   3 // Copyright 2009 The Go Authors. All rights reserved.
   4 // Use of this source code is governed by a BSD-style
   5 // license that can be found in the LICENSE file.
   6
   7 #include "go-system.h"
   8
   9 #include "go-c.h"
  10 #include "go-diagnostics.h"
  11
  12 #include "lex.h"
  13 #include "parse.h"
  14 #include "backend.h"
  15 #include "gogo.h"
  16
  17 // The data structures we build to represent the file.
  18 static Gogo* gogo;
  19
  20 // Create the main IR data structure.
  21
  22 GO_EXTERN_C
  23 void
  24 go_create_gogo(const struct go_create_gogo_args* args)
  25 {
  26   go_assert(::gogo == NULL);
  27   ::gogo = new Gogo(args->backend, args->linemap, args->int_type_size,
  28                     args->pointer_size);
  29
  30   if (args->pkgpath != NULL)
  31     ::gogo->set_pkgpath(args->pkgpath);
  32   else if (args->prefix != NULL)
  33     ::gogo->set_prefix(args->prefix);
  34
  35   if (args->relative_import_path != NULL)
  36     ::gogo->set_relative_import_path(args->relative_import_path);
  37   ::gogo->set_check_divide_by_zero(args->check_divide_by_zero);
  38   ::gogo->set_check_divide_overflow(args->check_divide_overflow);
  39   if (args->compiling_runtime)
  40     ::gogo->set_compiling_runtime(args->compiling_runtime);
  41   if (args->c_header != NULL)
  42     ::gogo->set_c_header(args->c_header);
  43   ::gogo->set_debug_escape_level(args->debug_escape_level);
  44   ::gogo->set_nil_check_size_threshold(args->nil_check_size_threshold);
  45 }
  46
  47 // Parse the input files.
  48
  49 GO_EXTERN_C
  50 void
  51 go_parse_input_files(const char** filenames, unsigned int filename_count,
  52                      bool only_check_syntax, bool)
  53 {
  54   go_assert(filename_count > 0);
  55
  56   Lex::Linknames all_linknames;
  57   for (unsigned int i = 0; i < filename_count; ++i)
  58     {
  59       if (i > 0)
  60         ::gogo->clear_file_scope();
  61
  62       const char* filename = filenames[i];
  63       FILE* file;
  64       if (strcmp(filename, "-") == 0)
  65         file = stdin;
  66       else
  67         {
  68           file = fopen(filename, "r");
  69           if (file == NULL)
  70             go_fatal_error(Linemap::unknown_location(),
  71                            "cannot open %s: %m", filename);
  72         }
  73
  74       Lex lexer(filename, file, ::gogo->linemap());
  75
  76       Parse parse(&lexer, ::gogo);
  77       parse.program();
  78
  79       if (strcmp(filename, "-") != 0)
  80         fclose(file);
  81
  82       Lex::Linknames* linknames = lexer.get_and_clear_linknames();
  83       if (linknames != NULL)
  84         {
  85           if (!::gogo->current_file_imported_unsafe())
  86             {
  87               for (Lex::Linknames::const_iterator p = linknames->begin();
  88                    p != linknames->end();
  89                    ++p)
  90                 go_error_at(p->second.loc,
  91                             ("//go:linkname only allowed in Go files that "
  92                              "import \"unsafe\""));
  93             }
  94           all_linknames.insert(linknames->begin(), linknames->end());
  95         }
  96     }
  97
  98   ::gogo->linemap()->stop();
  99
 100   ::gogo->clear_file_scope();
 101
 102   // If the global predeclared names are referenced but not defined,
 103   // define them now.
 104   ::gogo->define_global_names();
 105
 106   // Apply any go:linkname directives.
 107   for (Lex::Linknames::const_iterator p = all_linknames.begin();
 108        p != all_linknames.end();
 109        ++p)
 110     ::gogo->add_linkname(p->first, p->second.is_exported, p->second.ext_name,
 111                          p->second.loc);
 112
 113   // Finalize method lists and build stub methods for named types.
 114   ::gogo->finalize_methods();
 115
 116   // Check that functions have a terminating statement.
 117   ::gogo->check_return_statements();
 118
 119   // Now that we have seen all the names, lower the parse tree into a
 120   // form which is easier to use.
 121   ::gogo->lower_parse_tree();
 122
 123   // Create function descriptors as needed.
 124   ::gogo->create_function_descriptors();
 125
 126   // Now that we have seen all the names, verify that types are
 127   // correct.
 128   ::gogo->verify_types();
 129
 130   // Work out types of unspecified constants and variables.
 131   ::gogo->determine_types();
 132
 133   // Check types and issue errors as appropriate.
 134   ::gogo->check_types();
 135
 136   if (only_check_syntax)
 137     return;
 138
 139   ::gogo->analyze_escape();
 140
 141   // Export global identifiers as appropriate.
 142   ::gogo->do_exports();
 143
 144   // Turn short-cut operators (&&, ||) into explicit if statements.
 145   ::gogo->remove_shortcuts();
 146
 147   // Use temporary variables to force order of evaluation.
 148   ::gogo->order_evaluations();
 149
 150   // Convert named types to backend representation.
 151   ::gogo->convert_named_types();
 152
 153   // Build thunks for functions which call recover.
 154   ::gogo->build_recover_thunks();
 155
 156   // Convert complicated go and defer statements into simpler ones.
 157   ::gogo->simplify_thunk_statements();
 158
 159   // Write out queued up functions for hash and comparison of types.
 160   ::gogo->write_specific_type_functions();
 161
 162   // Add write barriers.
 163   ::gogo->add_write_barriers();
 164
 165   // Flatten the parse tree.
 166   ::gogo->flatten();
 167
 168   // Dump ast, use filename[0] as the base name
 169   ::gogo->dump_ast(filenames[0]);
 170 }
 171
 172 // Write out globals.
 173
 174 GO_EXTERN_C
 175 void
 176 go_write_globals()
 177 {
 178   return ::gogo->write_globals();
 179 }
 180
 181 // Return the global IR structure.  This is used by some of the
 182 // langhooks to pass to other code.
 183
 184 Gogo*
 185 go_get_gogo()
 186 {
 187   return ::gogo;
 188 }