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Undef value --- (for setting a value to be uninitialized/undefined)

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This commit is contained in:
Ginger Bill
2017-06-26 11:57:26 +01:00
parent 362a118782
commit c642e326ce
8 changed files with 124 additions and 14 deletions
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11
src/parser.cpp
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@@ -140,6 +140,7 @@ Array<AstNode *> make_ast_node_array(AstFile *f, isize init_capacity = 8) {
#define AST_NODE_KINDS \
AST_NODE_KIND(Ident, "identifier", Token) \
AST_NODE_KIND(Implicit, "implicit", Token) \
AST_NODE_KIND(Undef, "undef", Token) \
AST_NODE_KIND(BasicLit, "basic literal", Token) \
AST_NODE_KIND(BasicDirective, "basic directive", struct { \
Token token; \
@@ -516,6 +517,7 @@ Token ast_node_token(AstNode *node) {
switch (node->kind) {
case AstNode_Ident: return node->Ident;
case AstNode_Implicit: return node->Implicit;
case AstNode_Undef: return node->Undef;
case AstNode_BasicLit: return node->BasicLit;
case AstNode_BasicDirective: return node->BasicDirective.token;
case AstNode_ProcLit: return ast_node_token(node->ProcLit.type);
@@ -635,6 +637,7 @@ AstNode *clone_ast_node(gbAllocator a, AstNode *node) {
case AstNode_Invalid: break;
case AstNode_Ident: break;
case AstNode_Implicit: break;
case AstNode_Undef: break;
case AstNode_BasicLit: break;
case AstNode_BasicDirective: break;
case AstNode_Ellipsis:
@@ -1073,6 +1076,11 @@ AstNode *ast_implicit(AstFile *f, Token token) {
result->Implicit = token;
return result;
}
AstNode *ast_undef(AstFile *f, Token token) {
AstNode *result = make_ast_node(f, AstNode_Undef);
result->Undef = token;
return result;
}
AstNode *ast_basic_lit(AstFile *f, Token basic_lit) {
@@ -2200,6 +2208,9 @@ AstNode *parse_operand(AstFile *f, bool lhs) {
case Token_Ident:
return parse_ident(f);
case Token_Undef:
return ast_undef(f, expect_token(f, Token_Undef));
case Token_context:
return ast_implicit(f, expect_token(f, Token_context));