[validation] validate array constructors

Bug: tint:634
Change-Id: I873e510d3645886c878b686c1272ec2205e2bd70
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/54260
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Sarah Mashayekhi <sarahmashay@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Sarah Mashayekhi <sarahmashay@google.com>

src/resolver/resolver.cc

@@ -1876,7 +1876,9 @@ bool Resolver::Constructor(ast::ConstructorExpression* expr) {
     if (auto* mat_type = type->As<sem::Matrix>()) {
       return ValidateMatrixConstructor(type_ctor, mat_type);
     }
-    // TODO(crbug.com/tint/634): Validate array constructor
+    if (auto* arr_type = type->As<sem::Array>()) {
+      return ValidateArrayConstructor(type_ctor, arr_type);
+    }
   } else if (auto* scalar_ctor = expr->As<ast::ScalarConstructorExpression>()) {
     Mark(scalar_ctor->literal());
     auto* type = TypeOf(scalar_ctor->literal());
@@ -1890,6 +1892,46 @@ bool Resolver::Constructor(ast::ConstructorExpression* expr) {
   return true;
 }
 
+bool Resolver::ValidateArrayConstructor(
+    const ast::TypeConstructorExpression* ctor,
+    const sem::Array* array_type) {
+  auto& values = ctor->values();
+  auto* elem_type = array_type->ElemType();
+  for (auto* value : values) {
+    auto* value_type = TypeOf(value)->UnwrapRef();
+    if (value_type != elem_type) {
+      diagnostics_.add_error(
+          "type in array constructor does not match array type: "
+          "expected '" +
+              elem_type->FriendlyName(builder_->Symbols()) + "', found '" +
+              TypeNameOf(value) + "'",
+          value->source());
+      return false;
+    }
+  }
+
+  if (array_type->IsRuntimeSized()) {
+    diagnostics_.add_error("cannot init a runtime-sized array", ctor->source());
+    return false;
+  } else if (!values.empty() && (values.size() != array_type->Count())) {
+    std::string fm = values.size() < array_type->Count() ? "few" : "many";
+    diagnostics_.add_error("array constructor has too " + fm +
+                               " elements: expected " +
+                               std::to_string(array_type->Count()) +
+                               ", found " + std::to_string(values.size()),
+                           ctor->source());
+    return false;
+  } else if (values.size() > array_type->Count()) {
+    diagnostics_.add_error(
+        "array constructor has too many elements: expected " +
+            std::to_string(array_type->Count()) + ", found " +
+            std::to_string(values.size()),
+        ctor->source());
+    return false;
+  }
+  return true;
+}
+
 bool Resolver::ValidateVectorConstructor(
     const ast::TypeConstructorExpression* ctor,
     const sem::Vector* vec_type) {

src/resolver/resolver.h

@@ -275,6 +275,8 @@ class Resolver {
                                    const std::string& rhs_type_name);
   bool ValidateVectorConstructor(const ast::TypeConstructorExpression* ctor,
                                  const sem::Vector* vec_type);
+  bool ValidateArrayConstructor(const ast::TypeConstructorExpression* ctor,
+                                const sem::Array* arr_type);
   bool ValidateTypeDecl(const ast::TypeDecl* named_type) const;
   bool ValidateNoDuplicateDecorations(const ast::DecorationList& decorations);
 

src/resolver/validation_test.cc

@@ -728,6 +728,208 @@ TEST_F(ResolverValidationTest, OffsetAndAlignAndSizeDecoration) {
             "decorations");
 }
 
+TEST_F(ResolverValidationTest, Expr_Constructor_Array_ZeroValue_Pass) {
+  // array<u32, 10>();
+  auto* tc = array<u32, 10>();
+  WrapInFunction(tc);
+
+  EXPECT_TRUE(r()->Resolve());
+}
+
+TEST_F(ResolverValidationTest, Expr_Constructor_Array_type_match) {
+  // array<u32, 3>(0u, 10u. 20u);
+  auto* tc =
+      array<u32, 3>(create<ast::ScalarConstructorExpression>(Literal(0u)),
+                    create<ast::ScalarConstructorExpression>(Literal(10u)),
+                    create<ast::ScalarConstructorExpression>(Literal(20u)));
+  WrapInFunction(tc);
+
+  EXPECT_TRUE(r()->Resolve());
+}
+
+TEST_F(ResolverValidationTest, Expr_Constructor_Array_type_Mismatch_U32F32) {
+  // array<u32, 3>(0u, 1.0f, 20u);
+  auto* tc = array<u32, 3>(
+      create<ast::ScalarConstructorExpression>(Literal(0u)),
+      create<ast::ScalarConstructorExpression>(Source{{12, 34}}, Literal(1.0f)),
+      create<ast::ScalarConstructorExpression>(Literal(20u)));
+  WrapInFunction(tc);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: type in array constructor does not match array type: "
+            "expected 'u32', found 'f32'");
+}
+
+TEST_F(ResolverValidationTest,
+       Expr_Constructor_Array_ScalarArgumentTypeMismatch_F32I32) {
+  // array<f32, 1>(1);
+  auto* tc = array<f32, 1>(
+      create<ast::ScalarConstructorExpression>(Source{{12, 34}}, Literal(1)));
+  WrapInFunction(tc);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: type in array constructor does not match array type: "
+            "expected 'f32', found 'i32'");
+}
+
+TEST_F(ResolverValidationTest,
+       Expr_Constructor_Array_ScalarArgumentTypeMismatch_U32I32) {
+  // array<u32, 6>(1, 0u, 0u, 0u, 0u, 0u);
+  auto* tc = array<u32, 1>(
+      create<ast::ScalarConstructorExpression>(Source{{12, 34}}, Literal(1)),
+      create<ast::ScalarConstructorExpression>(Literal(0u)),
+      create<ast::ScalarConstructorExpression>(Literal(0u)),
+      create<ast::ScalarConstructorExpression>(Literal(0u)),
+      create<ast::ScalarConstructorExpression>(Literal(0u)));
+  WrapInFunction(tc);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: type in array constructor does not match array type: "
+            "expected 'u32', found 'i32'");
+}
+
+TEST_F(ResolverValidationTest,
+       Expr_Constructor_Array_ScalarArgumentTypeMismatch_Vec2) {
+  // array<i32, 3>(1, vec2<i32>());
+  auto* tc = array<i32, 3>(create<ast::ScalarConstructorExpression>(Literal(1)),
+                           create<ast::TypeConstructorExpression>(
+                               Source{{12, 34}}, ty.vec2<i32>(), ExprList()));
+  WrapInFunction(tc);
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: type in array constructor does not match array type: "
+            "expected 'i32', found 'vec2<i32>'");
+}
+
+TEST_F(ResolverValidationTest,
+       Expr_Constructor_ArrayOfVector_SubElemTypeMismatch_I32U32) {
+  // array<vec3<i32>, 2>(vec3<i32>(), vec3<u32>());
+  auto* e0 = vec3<i32>();
+  SetSource(Source::Location({12, 34}));
+  auto* e1 = vec3<u32>();
+  auto* t = Construct(ty.array(ty.vec3<i32>(), 2), e0, e1);
+  WrapInFunction(t);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: type in array constructor does not match array type: "
+            "expected 'vec3<i32>', found 'vec3<u32>'");
+}
+
+TEST_F(ResolverValidationTest,
+       Expr_Constructor_ArrayOfVector_SubElemTypeMismatch_I32Bool) {
+  // array<vec3<i32>, 2>(vec3<i32>(), vec3<bool>(true, true, false));
+  SetSource(Source::Location({12, 34}));
+  auto* e0 = vec3<bool>(true, true, false);
+  auto* e1 = vec3<i32>();
+  auto* t = Construct(ty.array(ty.vec3<i32>(), 2), e0, e1);
+  WrapInFunction(t);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: type in array constructor does not match array type: "
+            "expected 'vec3<i32>', found 'vec3<bool>'");
+}
+
+TEST_F(ResolverValidationTest,
+       Expr_Constructor_ArrayOfArray_SubElemSizeMismatch) {
+  // array<array<i32, 2>, 2>(array<i32, 3>(), array<i32, 2>());
+  SetSource(Source::Location({12, 34}));
+  auto* e0 = array<i32, 3>();
+  auto* e1 = array<i32, 2>();
+  auto* t = Construct(ty.array(ty.array<i32, 2>(), 2), e0, e1);
+  WrapInFunction(t);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: type in array constructor does not match array type: "
+            "expected 'array<i32, 2>', found 'array<i32, 3>'");
+}
+
+TEST_F(ResolverValidationTest,
+       Expr_Constructor_ArrayOfArray_SubElemTypeMismatch) {
+  // array<array<i32, 2>, 2>(array<i32, 2>(), array<u32, 2>());
+  auto* e0 = array<i32, 2>();
+  SetSource(Source::Location({12, 34}));
+  auto* e1 = array<u32, 2>();
+  auto* t = Construct(ty.array(ty.array<i32, 2>(), 2), e0, e1);
+  WrapInFunction(t);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: type in array constructor does not match array type: "
+            "expected 'array<i32, 2>', found 'array<u32, 2>'");
+}
+
+TEST_F(ResolverValidationTest,
+       Expr_Constructor_ArrayOfMatrix_SubElemTypeMismatch) {
+  // array<mat2x2<f32>, 2>(mat2x2<f32>(), mat2x2<i32>());
+  auto* e0 = mat2x2<f32>();
+  SetSource(Source::Location({12, 34}));
+  auto* e1 = mat2x2<i32>();
+  auto* t = Construct(ty.array(ty.mat2x2<f32>(), 2), e0, e1);
+  WrapInFunction(t);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: type in array constructor does not match array type: "
+            "expected 'mat2x2<f32>', found 'mat2x2<i32>'");
+}
+TEST_F(ResolverValidationTest, Expr_Constructor_Array_TooFewElements) {
+  // array<i32, 4>(1, 2, 3);
+  SetSource(Source::Location({12, 34}));
+  auto* tc =
+      array<i32, 4>(create<ast::ScalarConstructorExpression>(Literal(1)),
+                    create<ast::ScalarConstructorExpression>(Literal(2)),
+                    create<ast::ScalarConstructorExpression>(Literal(3)));
+  WrapInFunction(tc);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: array constructor has too few elements: expected 4, "
+            "found 3");
+}
+
+TEST_F(ResolverValidationTest, Expr_Constructor_Array_TooManyElements) {
+  // array<i32, 4>(1, 2, 3, 4, 5);
+  SetSource(Source::Location({12, 34}));
+  auto* tc =
+      array<i32, 4>(create<ast::ScalarConstructorExpression>(Literal(1)),
+                    create<ast::ScalarConstructorExpression>(Literal(2)),
+                    create<ast::ScalarConstructorExpression>(Literal(3)),
+                    create<ast::ScalarConstructorExpression>(Literal(4)),
+                    create<ast::ScalarConstructorExpression>(Literal(5)));
+  WrapInFunction(tc);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(),
+            "12:34 error: array constructor has too many "
+            "elements: expected 4, "
+            "found 5");
+}
+
+TEST_F(ResolverValidationTest, Expr_Constructor_Array_Runtime) {
+  // array<f32>(1);
+  auto* tc = array<i32>(
+      create<ast::ScalarConstructorExpression>(Source{{12, 34}}, Literal(1)));
+  WrapInFunction(tc);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(), "error: cannot init a runtime-sized array");
+}
+
+TEST_F(ResolverValidationTest, Expr_Constructor_Array_RuntimeZeroValue) {
+  // array<f32>();
+  auto* tc = array<i32>();
+  WrapInFunction(tc);
+
+  EXPECT_FALSE(r()->Resolve());
+  EXPECT_EQ(r()->error(), "error: cannot init a runtime-sized array");
+}
+
 TEST_F(ResolverValidationTest,
        Expr_Constructor_Vec2F32_Error_ScalarArgumentTypeMismatch) {
   auto* tc = vec2<f32>(