motiejus/zig
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new unreachable syntax

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* `noreturn` is the primitive type.
 * `unreachable` is a control flow keyword.
 * `@unreachable()` builtin function is deleted.

closes #214
This commit is contained in:
Andrew Kelley
2017-03-26 04:58:48 -04:00
parent 22e6bfca96
commit 451ce09067
35 changed files with 130 additions and 192 deletions
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9
src/parser.cpp
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@@ -705,7 +705,7 @@ static AstNode *ast_parse_try_expr(ParseContext *pc, size_t *token_index, bool m
/*
PrimaryExpression = Number | String | CharLiteral | KeywordLiteral | GroupedExpression | GotoExpression | BlockExpression | Symbol | ("@" Symbol FnCallExpression) | ArrayType | (option("extern") FnProto) | AsmExpression | ("error" "." Symbol) | ContainerDecl
KeywordLiteral = "true" | "false" | "null" | "break" | "continue" | "undefined" | "error" | "type" | "this"
KeywordLiteral = "true" | "false" | "null" | "break" | "continue" | "undefined" | "error" | "type" | "this" | "unreachable"
*/
static AstNode *ast_parse_primary_expr(ParseContext *pc, size_t *token_index, bool mandatory) {
Token *token = &pc->tokens->at(*token_index);
@@ -757,6 +757,10 @@ static AstNode *ast_parse_primary_expr(ParseContext *pc, size_t *token_index, bo
AstNode *node = ast_create_node(pc, NodeTypeThisLiteral, token);
*token_index += 1;
return node;
} else if (token->id == TokenIdKeywordUnreachable) {
AstNode *node = ast_create_node(pc, NodeTypeUnreachable, token);
*token_index += 1;
return node;
} else if (token->id == TokenIdKeywordType) {
AstNode *node = ast_create_node(pc, NodeTypeTypeLiteral, token);
*token_index += 1;
@@ -2728,6 +2732,9 @@ void ast_visit_node_children(AstNode *node, void (*visit)(AstNode **, void *cont
case NodeTypeContinue:
// none
break;
case NodeTypeUnreachable:
// none
break;
case NodeTypeAsmExpr:
for (size_t i = 0; i < node->data.asm_expr.input_list.length; i += 1) {
AsmInput *asm_input = node->data.asm_expr.input_list.at(i);