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Add #field_align(N)

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It sets the minimum alignment for the fields within a struct. This cannot be used with `#packed`, but can be used with `#align(N)`.
If `#align(N)` is less than `#field_align(N)`, then a warning will be printed.
This commit is contained in:
gingerBill
2024-01-28 17:33:29 +00:00
parent c1d853a24e
commit 68df35b378
6 changed files with 64 additions and 24 deletions
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25
src/parser.cpp
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@@ -383,10 +383,11 @@ gb_internal Ast *clone_ast(Ast *node, AstFile *f) {
n->DynamicArrayType.elem = clone_ast(n->DynamicArrayType.elem, f);
break;
case Ast_StructType:
n->StructType.fields = clone_ast_array(n->StructType.fields, f);
n->StructType.fields = clone_ast_array(n->StructType.fields, f);
n->StructType.polymorphic_params = clone_ast(n->StructType.polymorphic_params, f);
n->StructType.align = clone_ast(n->StructType.align, f);
n->StructType.where_clauses = clone_ast_array(n->StructType.where_clauses, f);
n->StructType.align = clone_ast(n->StructType.align, f);
n->StructType.field_align = clone_ast(n->StructType.field_align, f);
n->StructType.where_clauses = clone_ast_array(n->StructType.where_clauses, f);
break;
case Ast_UnionType:
n->UnionType.variants = clone_ast_array(n->UnionType.variants, f);
@@ -1125,7 +1126,7 @@ gb_internal Ast *ast_dynamic_array_type(AstFile *f, Token token, Ast *elem) {
gb_internal Ast *ast_struct_type(AstFile *f, Token token, Slice<Ast *> fields, isize field_count,
Ast *polymorphic_params, bool is_packed, bool is_raw_union, bool is_no_copy,
Ast *align,
Ast *align, Ast *field_align,
Token where_token, Array<Ast *> const &where_clauses) {
Ast *result = alloc_ast_node(f, Ast_StructType);
result->StructType.token = token;
@@ -1136,6 +1137,7 @@ gb_internal Ast *ast_struct_type(AstFile *f, Token token, Slice<Ast *> fields, i
result->StructType.is_raw_union = is_raw_union;
result->StructType.is_no_copy = is_no_copy;
result->StructType.align = align;
result->StructType.field_align = field_align;
result->StructType.where_token = where_token;
result->StructType.where_clauses = slice_from_array(where_clauses);
return result;
@@ -2507,6 +2509,7 @@ gb_internal Ast *parse_operand(AstFile *f, bool lhs) {
bool is_raw_union = false;
bool no_copy = false;
Ast *align = nullptr;
Ast *field_align = nullptr;
if (allow_token(f, Token_OpenParen)) {
isize param_count = 0;
@@ -2543,6 +2546,18 @@ gb_internal Ast *parse_operand(AstFile *f, bool lhs) {
error_line("\tSuggestion: #align(%s)", s);
gb_string_free(s);
}
} else if (tag.string == "field_align") {
if (field_align) {
syntax_error(tag, "Duplicate struct tag '#%.*s'", LIT(tag.string));
}
field_align = parse_expr(f, true);
if (field_align && field_align->kind != Ast_ParenExpr) {
ERROR_BLOCK();
gbString s = expr_to_string(field_align);
syntax_warning(tag, "#field_align requires parentheses around the expression");
error_line("\tSuggestion: #field_align(%s)", s);
gb_string_free(s);
}
} else if (tag.string == "raw_union") {
if (is_raw_union) {
syntax_error(tag, "Duplicate struct tag '#%.*s'", LIT(tag.string));
@@ -2591,7 +2606,7 @@ gb_internal Ast *parse_operand(AstFile *f, bool lhs) {
decls = fields->FieldList.list;
}
return ast_struct_type(f, token, decls, name_count, polymorphic_params, is_packed, is_raw_union, no_copy, align, where_token, where_clauses);
return ast_struct_type(f, token, decls, name_count, polymorphic_params, is_packed, is_raw_union, no_copy, align, field_align, where_token, where_clauses);
} break;
case Token_union: {