Unwrap member accessor aliases
The member accessors end up being aliases in a lot of cases because you
can't have a struct that isn't an alias. This Cl unwraps the aliases at
the start of the determination for member accessors.
Change-Id: Ib090ebd6aedd502c2812d95373c19d8eb831a361
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/20342
Reviewed-by: David Neto <dneto@google.com>
diff --git a/src/type_determiner.cc b/src/type_determiner.cc
index 317a8a5..820accd 100644
--- a/src/type_determiner.cc
+++ b/src/type_determiner.cc
@@ -408,6 +408,11 @@
auto* res = expr->structure()->result_type();
auto* data_type = res->UnwrapPtrIfNeeded();
+
+ while (data_type->IsAlias()) {
+ data_type = data_type->AsAlias()->type();
+ }
+
ast::type::Type* ret = nullptr;
if (data_type->IsStruct()) {
auto* strct = data_type->AsStruct()->impl();
diff --git a/src/type_determiner_test.cc b/src/type_determiner_test.cc
index 5e626b4..0f4da0d 100644
--- a/src/type_determiner_test.cc
+++ b/src/type_determiner_test.cc
@@ -41,6 +41,7 @@
#include "src/ast/struct.h"
#include "src/ast/struct_member.h"
#include "src/ast/switch_statement.h"
+#include "src/ast/type/alias_type.h"
#include "src/ast/type/array_type.h"
#include "src/ast/type/bool_type.h"
#include "src/ast/type/f32_type.h"
@@ -805,6 +806,43 @@
EXPECT_TRUE(ptr->type()->IsF32());
}
+TEST_F(TypeDeterminerTest, Expr_MemberAccessor_Struct_Alias) {
+ ast::type::I32Type i32;
+ ast::type::F32Type f32;
+
+ ast::StructMemberDecorationList decos;
+ ast::StructMemberList members;
+ members.push_back(std::make_unique<ast::StructMember>("first_member", &i32,
+ std::move(decos)));
+ members.push_back(std::make_unique<ast::StructMember>("second_member", &f32,
+ std::move(decos)));
+
+ auto strct = std::make_unique<ast::Struct>(ast::StructDecoration::kNone,
+ std::move(members));
+
+ auto st = std::make_unique<ast::type::StructType>(std::move(strct));
+ ast::type::AliasType alias("alias", st.get());
+
+ auto var = std::make_unique<ast::Variable>("my_struct",
+ ast::StorageClass::kNone, &alias);
+
+ mod()->AddGlobalVariable(std::move(var));
+
+ // Register the global
+ EXPECT_TRUE(td()->Determine());
+
+ auto ident = std::make_unique<ast::IdentifierExpression>("my_struct");
+ auto mem_ident = std::make_unique<ast::IdentifierExpression>("second_member");
+
+ ast::MemberAccessorExpression mem(std::move(ident), std::move(mem_ident));
+ EXPECT_TRUE(td()->DetermineResultType(&mem));
+ ASSERT_NE(mem.result_type(), nullptr);
+ ASSERT_TRUE(mem.result_type()->IsPointer());
+
+ auto* ptr = mem.result_type()->AsPointer();
+ EXPECT_TRUE(ptr->type()->IsF32());
+}
+
TEST_F(TypeDeterminerTest, Expr_MemberAccessor_VectorSwizzle) {
ast::type::F32Type f32;
ast::type::VectorType vec3(&f32, 3);