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Begin work in %flags.zf et al

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This commit is contained in:
gingerBill
2026-08-17 12:25:17 +01:00
parent 344e8afa36
commit db94c5a6cb
5 changed files with 115 additions and 6 deletions
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46
src/check_asm.cpp
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@@ -7,6 +7,9 @@ gb_internal i32 check_asm_operand_bit_width(Type *type) {
if (is_type_untyped(type)) {
return -1;
}
if (is_type_boolean(type)) {
return 1;
}
i64 sz = type_size_of(base_type(type));
if (sz <= 0) {
return 0;
@@ -432,6 +435,10 @@ gb_internal void check_asm_specs(AsmCtx *asm_ctx, CheckerContext *ctx, Scope *sc
string_set_init(&pin_set, specs.count);
defer (string_set_destroy(&pin_set));
StringSet pin_flag_set = {};
string_set_init(&pin_flag_set, specs.count);
defer (string_set_destroy(&pin_flag_set));
for (Ast *spec_ : specs) {
if (spec_->kind != Ast_AsmSpec) {
continue;
@@ -444,6 +451,7 @@ gb_internal void check_asm_specs(AsmCtx *asm_ctx, CheckerContext *ctx, Scope *sc
Entity *other_scratch = nullptr;
String pin = {};
String pin_flag = {};
if (spec->value != nullptr) {
if (spec->value->kind == Ast_Ident) {
other_scratch = scope_lookup(scope, spec->value->Ident.interned, spec->value->Ident.hash);
@@ -467,9 +475,17 @@ gb_internal void check_asm_specs(AsmCtx *asm_ctx, CheckerContext *ctx, Scope *sc
pin = reg->name.string;
if (pin.len != 0) {
Operand op = {};
check_register(asm_ctx, &op, reg);
if (string_set_update(&pin_set, pin)) {
error(spec->value, "Pinned register %%%.*s has already been assigned", LIT(pin));
if (check_register(asm_ctx, &op, reg)) {
if (reg->flag.string.len) {
GB_ASSERT(pin == "flags");
pin_flag = reg->flag.string;
if (string_set_update(&pin_flag_set, pin_flag)) {
error(spec->value, "Pinned register flag %%%.*s.%.*s has already been assigned", LIT(pin), LIT(pin_flag));
}
}
if (string_set_update(&pin_set, pin)) {
error(spec->value, "Pinned register %%%.*s has already been assigned", LIT(pin));
}
}
}
}
@@ -496,6 +512,7 @@ gb_internal void check_asm_specs(AsmCtx *asm_ctx, CheckerContext *ctx, Scope *sc
ed.param_group = AsmTemplateEntityDeclParamGroup_Scratch;
ed.total_index = cast(i32)asm_template_entity_decls->count;
ed.pin = pin;
ed.pin_flag = pin_flag;
if (other_scratch != nullptr) {
// Width-view of another operand: `p0b: u8 = p0`.
@@ -632,6 +649,9 @@ gb_internal void check_asm_specs(AsmCtx *asm_ctx, CheckerContext *ctx, Scope *sc
i->pin = pin;
o->pin = pin;
i->pin_flag = pin_flag;
o->pin_flag = pin_flag;
if (other_scratch != nullptr) {
GB_ASSERT(spec->value != nullptr);
error(spec->value, "Another parameter must be assigned/paired with a scratch parameter declaration, not a tie");
@@ -644,10 +664,26 @@ template <typename AsmCtx>
gb_internal bool check_register(AsmCtx *asm_ctx, Operand *operand, AstAsmRegister *asm_reg) {
String name = asm_reg->name.string;
if (asm_reg->flag.kind == Token_Ident) {
// TODO(bill): has flags
if (name != "cc") {
bool ok = true;
i32 width = 0;
String flag = asm_reg->flag.string;
if (name != "flags") {
error(asm_reg->name, "Register flags can only be called on %%flags");
ok = false;
} else {
i32 bit = asm_ctx->flag_bit_from_name(flag, &width);
if (bit < 0) {
error(asm_reg->flag, "Unknown register %%flags name: %.*s", LIT(flag));
ok = false;
}
}
operand->type = t_bool;
if (width > 1) {
operand->type = t_u8;
}
return ok;
}
auto r = asm_ctx->register_lookup(name);