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attempt to get preprocessor entities from libclang

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I'm pretty sure it's impossible, the API does not
expose the macro expansion value

and the source location points to the macro's name,
not its value.
This commit is contained in:
Andrew Kelley 2016-01-28 23:18:18 -07:00
parent 650fdded29
commit 923e78785d
1 changed files with 32 additions and 0 deletions
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32
src/parseh.cpp
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@ -713,6 +713,30 @@ static void render_aliases(Context *c) {
}
}
static void process_preprocessor_entities(Context *c, ASTUnit &unit) {
for (PreprocessedEntity *entity : unit.getLocalPreprocessingEntities()) {
switch (entity->getKind()) {
case PreprocessedEntity::InvalidKind:
case PreprocessedEntity::InclusionDirectiveKind:
case PreprocessedEntity::MacroExpansionKind:
continue;
case PreprocessedEntity::MacroDefinitionKind:
{
MacroDefinitionRecord *macro = static_cast<MacroDefinitionRecord *>(entity);
const char *name = macro->getName()->getNameStart();
fprintf(stderr, "definition macro: %s\n", name);
SourceRange range = macro->getSourceRange();
SourceLocation begin_loc = range.getBegin();
SourceLocation end_loc = range.getEnd();
const char *start_c = c->source_manager->getCharacterData(begin_loc);
const char *end_c = c->source_manager->getCharacterData(end_loc);
fprintf(stderr, "source: '%.*s'\n", (int)(end_c - start_c), start_c);
}
}
}
}
int parse_h_buf(ImportTableEntry *import, ZigList<ErrorMsg *> *errors, Buf *source,
const char **args, int args_len, const char *libc_include_path, bool warnings_on)
{
@ -774,6 +798,12 @@ int parse_h_file(ImportTableEntry *import, ZigList<ErrorMsg *> *errors,
// we don't need spell checking and it slows things down
clang_argv->append("-fno-spell-checking");
// this gives us access to preprocessing entities, presumably at
// the cost of performance
clang_argv->append("-Xclang");
clang_argv->append("-detailed-preprocessing-record");
// to make the end argument work
clang_argv->append(nullptr);
@ -844,6 +874,8 @@ int parse_h_file(ImportTableEntry *import, ZigList<ErrorMsg *> *errors,
c->root = create_node(c, NodeTypeRoot);
ast_unit->visitLocalTopLevelDecls(c, decl_visitor);
process_preprocessor_entities(c, *ast_unit);
render_aliases(c);
normalize_parent_ptrs(c->root);