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