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Support segment overrides on asm memory operands

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This commit is contained in:
gingerBill
2026-08-18 14:44:24 +01:00
parent 12c89ee2bf
commit fd9ccd7b10
4 changed files with 76 additions and 14 deletions
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33
src/parser.cpp
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@@ -548,6 +548,7 @@ gb_internal Ast *clone_ast(Ast *node, AstFile *f) {
n->AsmInstruction.operands = clone_ast_array(n->AsmInstruction.operands, f);
break;
case Ast_AsmMemoryOperand:
n->AsmMemoryOperand.segment_override = clone_ast(n->AsmMemoryOperand.segment_override, f);
n->AsmMemoryOperand.base = clone_ast(n->AsmMemoryOperand.base, f);
n->AsmMemoryOperand.index = clone_ast(n->AsmMemoryOperand.index, f);
n->AsmMemoryOperand.scale = clone_ast(n->AsmMemoryOperand.scale, f);
@@ -2483,6 +2484,7 @@ gb_internal Ast *parse_asm_operand(AstFile *f, bool allow_memory_operand) {
case Token_OpenBracket:
if (allow_memory_operand) {
Token open = expect_token(f, Token_OpenBracket);
Ast *segment_override = nullptr;
Ast *base = nullptr;
Ast *index = nullptr;
Ast *scale = nullptr;
@@ -2495,6 +2497,16 @@ gb_internal Ast *parse_asm_operand(AstFile *f, bool allow_memory_operand) {
base = parse_asm_operand(f, false);
if (allow_token(f, Token_Colon)) {
// [segment: ...]
segment_override = base;
if (segment_override != nullptr &&
segment_override->kind != Ast_AsmRegister) {
error(segment_override, "Expected an asm register as the segment override");
}
base = parse_asm_operand(f, false);
}
// [base]
// [base + index]
// [base - index]
@@ -2526,16 +2538,17 @@ gb_internal Ast *parse_asm_operand(AstFile *f, bool allow_memory_operand) {
}
Ast *mem = alloc_ast_node(f, Ast_AsmMemoryOperand);
mem->AsmMemoryOperand.open = open;
mem->AsmMemoryOperand.base = base;
mem->AsmMemoryOperand.index_op = index_op;
mem->AsmMemoryOperand.index = index;
mem->AsmMemoryOperand.scale_op = scale_op;
mem->AsmMemoryOperand.scale = scale;
mem->AsmMemoryOperand.disp_op = disp_op;
mem->AsmMemoryOperand.disp = disp;
mem->AsmMemoryOperand.close = close;
mem->AsmMemoryOperand.type = type;
mem->AsmMemoryOperand.open = open;
mem->AsmMemoryOperand.segment_override = segment_override;
mem->AsmMemoryOperand.base = base;
mem->AsmMemoryOperand.index_op = index_op;
mem->AsmMemoryOperand.index = index;
mem->AsmMemoryOperand.scale_op = scale_op;
mem->AsmMemoryOperand.scale = scale;
mem->AsmMemoryOperand.disp_op = disp_op;
mem->AsmMemoryOperand.disp = disp;
mem->AsmMemoryOperand.close = close;
mem->AsmMemoryOperand.type = type;
return mem;
}