motiejus/zig
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support linker directives

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now you can depend on libc in zig language instead of it being
hardcoded in the compiler.
This commit is contained in:
Andrew Kelley
2015-11-24 23:44:41 -07:00
parent afac1a0123
commit 09f68c7c33
7 changed files with 120 additions and 7 deletions
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75
src/parser.cpp
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@@ -48,6 +48,8 @@ const char *node_type_str(NodeType node_type) {
return "FnCall";
case NodeTypeExternBlock:
return "ExternBlock";
case NodeTypeDirective:
return "Directive";
}
zig_unreachable();
}
@@ -158,13 +160,23 @@ struct ParseContext {
Buf *buf;
AstNode *root;
ZigList<Token> *tokens;
ZigList<AstNode *> *directive_list;
};
static AstNode *ast_create_node(NodeType type, Token *first_token) {
static AstNode *ast_create_node_no_line_info(NodeType type) {
AstNode *node = allocate<AstNode>(1);
node->type = type;
return node;
}
static void ast_update_node_line_info(AstNode *node, Token *first_token) {
node->line = first_token->start_line;
node->column = first_token->start_column;
}
static AstNode *ast_create_node(NodeType type, Token *first_token) {
AstNode *node = ast_create_node_no_line_info(type);
ast_update_node_line_info(node, first_token);
return node;
}
@@ -536,7 +548,57 @@ static AstNode *ast_parse_fn_decl(ParseContext *pc, int token_index, int *new_to
}
/*
ExternBlock : token(Extern) token(LBrace) many(FnProtoDecl) token(RBrace)
Directive : token(NumberSign) token(Symbol) token(LParen) token(String) token(RParen)
*/
static AstNode *ast_parse_directive(ParseContext *pc, int token_index, int *new_token_index) {
Token *number_sign = &pc->tokens->at(token_index);
token_index += 1;
ast_expect_token(pc, number_sign, TokenIdNumberSign);
AstNode *node = ast_create_node(NodeTypeDirective, number_sign);
Token *name_symbol = &pc->tokens->at(token_index);
token_index += 1;
ast_expect_token(pc, name_symbol, TokenIdSymbol);
ast_buf_from_token(pc, name_symbol, &node->data.directive.name);
Token *l_paren = &pc->tokens->at(token_index);
token_index += 1;
ast_expect_token(pc, l_paren, TokenIdLParen);
Token *param_str = &pc->tokens->at(token_index);
token_index += 1;
ast_expect_token(pc, param_str, TokenIdStringLiteral);
parse_string_literal(pc, param_str, &node->data.directive.param);
Token *r_paren = &pc->tokens->at(token_index);
token_index += 1;
ast_expect_token(pc, r_paren, TokenIdRParen);
*new_token_index = token_index;
return node;
}
static void ast_parse_directives(ParseContext *pc, int token_index, int *new_token_index,
ZigList<AstNode *> *directives)
{
for (;;) {
Token *token = &pc->tokens->at(token_index);
if (token->id == TokenIdNumberSign) {
AstNode *directive_node = ast_parse_directive(pc, token_index, &token_index);
directives->append(directive_node);
} else {
*new_token_index = token_index;
return;
}
}
zig_unreachable();
}
/*
ExternBlock : many(Directive) token(Extern) token(LBrace) many(FnProtoDecl) token(RBrace)
*/
static AstNode *ast_parse_extern_block(ParseContext *pc, int token_index, int *new_token_index) {
Token *extern_kw = &pc->tokens->at(token_index);
@@ -545,6 +607,9 @@ static AstNode *ast_parse_extern_block(ParseContext *pc, int token_index, int *n
AstNode *node = ast_create_node(NodeTypeExternBlock, extern_kw);
node->data.extern_block.directives = pc->directive_list;
pc->directive_list = nullptr;
Token *l_brace = &pc->tokens->at(token_index);
token_index += 1;
ast_expect_token(pc, l_brace, TokenIdLBrace);
@@ -570,7 +635,11 @@ static void ast_parse_top_level_decls(ParseContext *pc, int token_index, int *ne
{
for (;;) {
Token *token = &pc->tokens->at(token_index);
if (token->id == TokenIdKeywordFn) {
if (token->id == TokenIdNumberSign) {
assert(!pc->directive_list);
pc->directive_list = allocate<ZigList<AstNode*>>(1);
ast_parse_directives(pc, token_index, &token_index, pc->directive_list);
} else if (token->id == TokenIdKeywordFn) {
AstNode *fn_decl_node = ast_parse_fn_def(pc, token_index, &token_index);
top_level_decls->append(fn_decl_node);
} else if (token->id == TokenIdKeywordExtern) {