// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "gmock/gmock.h"
#include "src/reader/spirv/function.h"
#include "src/reader/spirv/parser_impl_test_helper.h"
#include "src/reader/spirv/spirv_tools_helpers_test.h"

namespace tint {
namespace reader {
namespace spirv {
namespace {

using ::testing::Eq;
using ::testing::HasSubstr;

using SpvParserMemoryTest = SpvParserTest;

std::string Preamble() {
  return R"(
    OpCapability Shader
    OpMemoryModel Logical Simple
    OpEntryPoint Fragment %100 "main"
    OpExecutionMode %100 OriginUpperLeft
)";
}

TEST_F(SpvParserMemoryTest, EmitStatement_StoreBoolConst) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeBool
     %true = OpConstantTrue %ty
     %false = OpConstantFalse %ty
     %null = OpConstantNull %ty
     %ptr_ty = OpTypePointer Function %ty
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %1 = OpVariable %ptr_ty Function
     OpStore %1 %true
     OpStore %1 %false
     OpStore %1 %null
     OpReturn
     OpFunctionEnd
  )"));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{true}
}
Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{false}
}
Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{false}
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_StoreUintConst) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeInt 32 0
     %val = OpConstant %ty 42
     %null = OpConstantNull %ty
     %ptr_ty = OpTypePointer Function %ty
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %1 = OpVariable %ptr_ty Function
     OpStore %1 %val
     OpStore %1 %null
     OpReturn
     OpFunctionEnd
  )"));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{42u}
}
Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{0u}
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_StoreIntConst) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeInt 32 1
     %val = OpConstant %ty 42
     %null = OpConstantNull %ty
     %ptr_ty = OpTypePointer Function %ty
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %1 = OpVariable %ptr_ty Function
     OpStore %1 %val
     OpStore %1 %null
     OpReturn
     OpFunctionEnd
  )"));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{42}
}
Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{0}
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_StoreFloatConst) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeFloat 32
     %val = OpConstant %ty 42
     %null = OpConstantNull %ty
     %ptr_ty = OpTypePointer Function %ty
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %1 = OpVariable %ptr_ty Function
     OpStore %1 %val
     OpStore %1 %null
     OpReturn
     OpFunctionEnd
  )"));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{42.000000}
}
Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{0.000000}
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_LoadBool) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeBool
     %true = OpConstantTrue %ty
     %false = OpConstantFalse %ty
     %null = OpConstantNull %ty
     %ptr_ty = OpTypePointer Function %ty
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %1 = OpVariable %ptr_ty Function %true
     %2 = OpLoad %ty %1
     OpReturn
     OpFunctionEnd
  )"));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(
  VariableConst{
    x_2
    none
    undefined
    __bool
    {
      Identifier[not set]{x_1}
    }
  })"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_LoadScalar) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeInt 32 0
     %ty_42 = OpConstant %ty 42
     %ptr_ty = OpTypePointer Function %ty
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %1 = OpVariable %ptr_ty Function %ty_42
     %2 = OpLoad %ty %1
     %3 = OpLoad %ty %1
     OpReturn
     OpFunctionEnd
  )"));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()),
              HasSubstr(R"(VariableDeclStatement{
  VariableConst{
    x_2
    none
    undefined
    __u32
    {
      Identifier[not set]{x_1}
    }
  }
}
VariableDeclStatement{
  VariableConst{
    x_3
    none
    undefined
    __u32
    {
      Identifier[not set]{x_1}
    }
  }
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_UseLoadedScalarTwice) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeInt 32 0
     %ty_42 = OpConstant %ty 42
     %ptr_ty = OpTypePointer Function %ty
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %1 = OpVariable %ptr_ty Function %ty_42
     %2 = OpLoad %ty %1
     OpStore %1 %2
     OpStore %1 %2
     OpReturn
     OpFunctionEnd
  )"));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()),
              HasSubstr(R"(VariableDeclStatement{
  VariableConst{
    x_2
    none
    undefined
    __u32
    {
      Identifier[not set]{x_1}
    }
  }
}
Assignment{
  Identifier[not set]{x_1}
  Identifier[not set]{x_2}
}
Assignment{
  Identifier[not set]{x_1}
  Identifier[not set]{x_2}
}
)"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_StoreToModuleScopeVar) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeInt 32 0
     %val = OpConstant %ty 42
     %ptr_ty = OpTypePointer Private %ty
     %1 = OpVariable %ptr_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     OpStore %1 %val
     OpReturn
     OpFunctionEnd
  )"));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  Identifier[not set]{x_1}
  ScalarConstructor[not set]{42u}
})"));
}

TEST_F(SpvParserMemoryTest,
       EmitStatement_CopyMemory_Scalar_Function_To_Private) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeInt 32 0
     %val = OpConstant %ty 42
     %ptr_fn_ty = OpTypePointer Function %ty
     %ptr_priv_ty = OpTypePointer Private %ty
     %2 = OpVariable %ptr_priv_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %1 = OpVariable %ptr_fn_ty Function
     OpCopyMemory %2 %1
     OpReturn
     OpFunctionEnd
  )"));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions()) << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  const auto got = ToString(p->builder(), fe.ast_body());
  const auto* expected = R"(Assignment{
  Identifier[not set]{x_2}
  Identifier[not set]{x_1}
})";
  EXPECT_THAT(got, HasSubstr(expected));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_NoOperands) {
  auto err = test::AssembleFailure(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %ty = OpTypeInt 32 0
     %val = OpConstant %ty 42
     %ptr_ty = OpTypePointer Private %ty
     %1 = OpVariable %ptr_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel

     %2 = OpAccessChain %ptr_ty  ; Needs a base operand
     OpStore %1 %val
     OpReturn
  )");
  EXPECT_THAT(err,
              Eq("16:5: Expected operand, found next instruction instead."));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_BaseIsNotPointer) {
  auto p = parser(test::Assemble(Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %10 = OpTypeInt 32 0
     %val = OpConstant %10 42
     %ptr_ty = OpTypePointer Private %10
     %20 = OpVariable %10 Private ; bad pointer type
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %1 = OpAccessChain %ptr_ty %20
     OpStore %1 %val
     OpReturn
  )"));
  EXPECT_FALSE(p->BuildAndParseInternalModuleExceptFunctions());
  EXPECT_THAT(p->error(), Eq("variable with ID 20 has non-pointer type 10"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_VectorSwizzle) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %uint = OpTypeInt 32 0
     %store_ty = OpTypeVector %uint 4
     %uint_2 = OpConstant %uint 2
     %uint_42 = OpConstant %uint 42
     %elem_ty = OpTypePointer Private %uint
     %var_ty = OpTypePointer Private %store_ty
     %1 = OpVariable %var_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %uint_2
     OpStore %2 %uint_42
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  MemberAccessor[not set]{
    Identifier[not set]{myvar}
    Identifier[not set]{z}
  }
  ScalarConstructor[not set]{42u}
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_VectorConstOutOfBounds) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %uint = OpTypeInt 32 0
     %store_ty = OpTypeVector %uint 4
     %42 = OpConstant %uint 42
     %uint_99 = OpConstant %uint 99
     %elem_ty = OpTypePointer Private %uint
     %var_ty = OpTypePointer Private %store_ty
     %1 = OpVariable %var_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %42
     OpStore %2 %uint_99
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_FALSE(fe.EmitBody());
  EXPECT_THAT(p->error(), Eq("Access chain %2 index %42 value 42 is out of "
                             "bounds for vector of 4 elements"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_VectorNonConstIndex) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     OpName %13 "a_dynamic_index"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %uint = OpTypeInt 32 0
     %store_ty = OpTypeVector %uint 4
     %uint_2 = OpConstant %uint 2
     %uint_42 = OpConstant %uint 42
     %elem_ty = OpTypePointer Private %uint
     %var_ty = OpTypePointer Private %store_ty
     %1 = OpVariable %var_ty Private
     %10 = OpVariable %var_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %11 = OpLoad %store_ty %10
     %12 = OpCompositeExtract %uint %11 2
     %13 = OpCopyObject %uint %12
     %2 = OpAccessChain %elem_ty %1 %13
     OpStore %2 %uint_42
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  ArrayAccessor[not set]{
    Identifier[not set]{myvar}
    Identifier[not set]{a_dynamic_index}
  }
  ScalarConstructor[not set]{42u}
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_Matrix) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %float = OpTypeFloat 32
     %v4float = OpTypeVector %float 4
     %m3v4float = OpTypeMatrix %v4float 3
     %elem_ty = OpTypePointer Private %v4float
     %var_ty = OpTypePointer Private %m3v4float
     %uint = OpTypeInt 32 0
     %uint_2 = OpConstant %uint 2
     %float_42 = OpConstant %float 42
     %v4float_42 = OpConstantComposite %v4float %float_42 %float_42 %float_42 %float_42

     %1 = OpVariable %var_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %uint_2
     OpStore %2 %v4float_42
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  ArrayAccessor[not set]{
    Identifier[not set]{myvar}
    ScalarConstructor[not set]{2u}
  }
  TypeConstructor[not set]{
    __vec_4__f32
    ScalarConstructor[not set]{42.000000}
    ScalarConstructor[not set]{42.000000}
    ScalarConstructor[not set]{42.000000}
    ScalarConstructor[not set]{42.000000}
  }
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_Array) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %float = OpTypeFloat 32
     %v4float = OpTypeVector %float 4
     %m3v4float = OpTypeMatrix %v4float 3
     %elem_ty = OpTypePointer Private %v4float
     %var_ty = OpTypePointer Private %m3v4float
     %uint = OpTypeInt 32 0
     %uint_2 = OpConstant %uint 2
     %float_42 = OpConstant %float 42
     %v4float_42 = OpConstantComposite %v4float %float_42 %float_42 %float_42 %float_42

     %1 = OpVariable %var_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %uint_2
     OpStore %2 %v4float_42
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  ArrayAccessor[not set]{
    Identifier[not set]{myvar}
    ScalarConstructor[not set]{2u}
  }
  TypeConstructor[not set]{
    __vec_4__f32
    ScalarConstructor[not set]{42.000000}
    ScalarConstructor[not set]{42.000000}
    ScalarConstructor[not set]{42.000000}
    ScalarConstructor[not set]{42.000000}
  }
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_Struct) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     OpMemberName %strct 1 "age"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %float = OpTypeFloat 32
     %float_42 = OpConstant %float 42
     %strct = OpTypeStruct %float %float
     %elem_ty = OpTypePointer Private %float
     %var_ty = OpTypePointer Private %strct
     %uint = OpTypeInt 32 0
     %uint_1 = OpConstant %uint 1

     %1 = OpVariable %var_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %uint_1
     OpStore %2 %float_42
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  MemberAccessor[not set]{
    Identifier[not set]{myvar}
    Identifier[not set]{age}
  }
  ScalarConstructor[not set]{42.000000}
})"));
}

TEST_F(SpvParserMemoryTest,
       EmitStatement_AccessChain_Struct_DifferOnlyMemberName) {
  // The spirv-opt internal representation will map both structs to the
  // same canonicalized type, because it doesn't care about member names.
  // But we care about member names when producing a member-access expression.
  // crbug.com/tint/213
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     OpName %10 "myvar2"
     OpMemberName %strct 1 "age"
     OpMemberName %strct2 1 "ancientness"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %float = OpTypeFloat 32
     %float_42 = OpConstant %float 42
     %float_420 = OpConstant %float 420
     %strct = OpTypeStruct %float %float
     %strct2 = OpTypeStruct %float %float
     %elem_ty = OpTypePointer Private %float
     %var_ty = OpTypePointer Private %strct
     %var2_ty = OpTypePointer Private %strct2
     %uint = OpTypeInt 32 0
     %uint_1 = OpConstant %uint 1

     %1 = OpVariable %var_ty Private
     %10 = OpVariable %var2_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %uint_1
     OpStore %2 %float_42
     %20 = OpAccessChain %elem_ty %10 %uint_1
     OpStore %20 %float_420
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  MemberAccessor[not set]{
    Identifier[not set]{myvar}
    Identifier[not set]{age}
  }
  ScalarConstructor[not set]{42.000000}
}
Assignment{
  MemberAccessor[not set]{
    Identifier[not set]{myvar2}
    Identifier[not set]{ancientness}
  }
  ScalarConstructor[not set]{420.000000}
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_StructNonConstIndex) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     OpMemberName %55 1 "age"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %float = OpTypeFloat 32
     %float_42 = OpConstant %float 42
     %55 = OpTypeStruct %float %float
     %elem_ty = OpTypePointer Private %float
     %var_ty = OpTypePointer Private %55
     %uint = OpTypeInt 32 0
     %uint_1 = OpConstant %uint 1
     %uint_ptr = OpTypePointer Private %uint
     %uintvar = OpVariable %uint_ptr Private

     %1 = OpVariable %var_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %10 = OpLoad %uint %uintvar
     %2 = OpAccessChain %elem_ty %1 %10
     OpStore %2 %float_42
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_FALSE(fe.EmitBody());
  EXPECT_THAT(p->error(), Eq("Access chain %2 index %10 is a non-constant "
                             "index into a structure %55"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_StructConstOutOfBounds) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     OpMemberName %55 1 "age"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %float = OpTypeFloat 32
     %float_42 = OpConstant %float 42
     %55 = OpTypeStruct %float %float
     %elem_ty = OpTypePointer Private %float
     %var_ty = OpTypePointer Private %55
     %uint = OpTypeInt 32 0
     %uint_99 = OpConstant %uint 99

     %1 = OpVariable %var_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %uint_99
     OpStore %2 %float_42
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_FALSE(fe.EmitBody());
  EXPECT_THAT(p->error(), Eq("Access chain %2 index value 99 is out of bounds "
                             "for structure %55 having 2 members"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_Struct_RuntimeArray) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     OpMemberName %strct 1 "age"

     OpDecorate %1 DescriptorSet 0
     OpDecorate %1 Binding 0
     OpDecorate %strct BufferBlock
     OpMemberDecorate %strct 0 Offset 0
     OpMemberDecorate %strct 1 Offset 4
     OpDecorate %rtarr ArrayStride 4

     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %float = OpTypeFloat 32
     %float_42 = OpConstant %float 42
     %rtarr = OpTypeRuntimeArray %float
     %strct = OpTypeStruct %float %rtarr
     %elem_ty = OpTypePointer Uniform %float
     %var_ty = OpTypePointer Uniform %strct
     %uint = OpTypeInt 32 0
     %uint_1 = OpConstant %uint 1
     %uint_2 = OpConstant %uint 2

     %1 = OpVariable %var_ty Uniform
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %uint_1 %uint_2
     OpStore %2 %float_42
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  ArrayAccessor[not set]{
    MemberAccessor[not set]{
      Identifier[not set]{myvar}
      Identifier[not set]{age}
    }
    ScalarConstructor[not set]{2u}
  }
  ScalarConstructor[not set]{42.000000}
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_Compound_Matrix_Vector) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %float = OpTypeFloat 32
     %v4float = OpTypeVector %float 4
     %m3v4float = OpTypeMatrix %v4float 3
     %elem_ty = OpTypePointer Private %float
     %var_ty = OpTypePointer Private %m3v4float
     %uint = OpTypeInt 32 0
     %uint_2 = OpConstant %uint 2
     %uint_3 = OpConstant %uint 3
     %float_42 = OpConstant %float 42

     %1 = OpVariable %var_ty Private
     %100 = OpFunction %void None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %uint_2 %uint_3
     OpStore %2 %float_42
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody());
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  MemberAccessor[not set]{
    ArrayAccessor[not set]{
      Identifier[not set]{myvar}
      ScalarConstructor[not set]{2u}
    }
    Identifier[not set]{w}
  }
  ScalarConstructor[not set]{42.000000}
})"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_InvalidPointeeType) {
  const std::string assembly = Preamble() + R"(
     OpName %1 "myvar"
     %55 = OpTypeVoid
     %voidfn = OpTypeFunction %55
     %float = OpTypeFloat 32
     %60 = OpTypePointer Private %55
     %var_ty = OpTypePointer Private %60
     %uint = OpTypeInt 32 0
     %uint_2 = OpConstant %uint 2

     %1 = OpVariable %var_ty Private
     %100 = OpFunction %55 None %voidfn
     %entry = OpLabel
     %2 = OpAccessChain %60 %1 %uint_2
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_FALSE(fe.EmitBody());
  EXPECT_THAT(p->error(),
              HasSubstr("Access chain with unknown or invalid pointee type "
                        "%60: %60 = OpTypePointer Private %55"));
}

TEST_F(SpvParserMemoryTest, EmitStatement_AccessChain_DereferenceBase) {
  // The base operand to OpAccessChain may have to be dereferenced first.
  // crbug.com/tint/737
  const std::string assembly = Preamble() + R"(
     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void

     %uint = OpTypeInt 32 0
     %v2uint = OpTypeVector %uint 2
     %elem_ty = OpTypePointer Private %uint
     %vec_ty = OpTypePointer Private %v2uint

     %ptrfn = OpTypeFunction %void %vec_ty

     %uint_0 = OpConstant %uint 0

     ; The shortest way to make a pointer example is as a function parameter.
     %200 = OpFunction %void None %ptrfn
     %1 = OpFunctionParameter %vec_ty
     %entry = OpLabel
     %2 = OpAccessChain %elem_ty %1 %uint_0
     %3 = OpLoad %uint %2
     OpReturn
     OpFunctionEnd

     %100 = OpFunction %void None %voidfn
     %main_entry = OpLabel
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule());
  const auto got = p->program().to_str();
  const std::string expected = R"(Module{
  Function x_200 -> __void
  (
    VariableConst{
      x_1
      none
      undefined
      __ptr_private__vec_2__u32
    }
  )
  {
    VariableDeclStatement{
      VariableConst{
        x_3
        none
        undefined
        __u32
        {
          MemberAccessor[not set]{
            UnaryOp[not set]{
              indirection
              Identifier[not set]{x_1}
            }
            Identifier[not set]{x}
          }
        }
      }
    }
    Return{}
  }
  Function main_1 -> __void
  ()
  {
    Return{}
  }
  Function main -> __void
  StageDecoration{fragment}
  ()
  {
    Call[not set]{
      Identifier[not set]{main_1}
      (
      )
    }
  }
}
)";
  EXPECT_EQ(got, expected) << got;
}

TEST_F(SpvParserMemoryTest,
       EmitStatement_AccessChain_InferFunctionStorageClass) {
  // An access chain can have no indices. When the base is a Function variable,
  // the reference type has no explicit storage class in the AST representation.
  // But the pointer type for the let declaration must have an explicit
  // 'function' storage class. From crbug.com/tint/807
  const std::string assembly = R"(
OpCapability Shader
OpMemoryModel Logical Simple
OpEntryPoint Fragment %main "main"
OpExecutionMode %main OriginUpperLeft

%uint = OpTypeInt 32 0
%ptr_ty = OpTypePointer Function %uint

  %void = OpTypeVoid
%voidfn = OpTypeFunction %void
  %main = OpFunction %void None %voidfn
 %entry = OpLabel
     %1 = OpVariable %ptr_ty Function
     %2 = OpAccessChain %ptr_ty %1
          OpReturn
          OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << assembly;
  const auto got = p->program().to_str();
  const std::string expected = R"(Module{
  Function main_1 -> __void
  ()
  {
    VariableDeclStatement{
      Variable{
        x_1
        none
        undefined
        __u32
      }
    }
    VariableDeclStatement{
      VariableConst{
        x_2
        none
        undefined
        __ptr_function__u32
        {
          UnaryOp[not set]{
            address-of
            Identifier[not set]{x_1}
          }
        }
      }
    }
    Return{}
  }
  Function main -> __void
  StageDecoration{fragment}
  ()
  {
    Call[not set]{
      Identifier[not set]{main_1}
      (
      )
    }
  }
}
)";
  EXPECT_EQ(got, expected) << got;
}

std::string OldStorageBufferPreamble() {
  return Preamble() + R"(
     OpName %myvar "myvar"

     OpDecorate %myvar DescriptorSet 0
     OpDecorate %myvar Binding 0

     OpDecorate %struct BufferBlock
     OpMemberDecorate %struct 0 Offset 0
     OpMemberDecorate %struct 1 Offset 4
     OpDecorate %arr ArrayStride 4

     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %uint = OpTypeInt 32 0

     %uint_0 = OpConstant %uint 0
     %uint_1 = OpConstant %uint 1

     %arr = OpTypeRuntimeArray %uint
     %struct = OpTypeStruct %uint %arr
     %ptr_struct = OpTypePointer Uniform %struct
     %ptr_uint = OpTypePointer Uniform %uint

     %myvar = OpVariable %ptr_struct Uniform
  )";
}

TEST_F(SpvParserMemoryTest, RemapStorageBuffer_TypesAndVarDeclarations) {
  // Enusure we get the right module-scope declaration.  This tests translation
  // of the structure type, arrays of the structure, pointers to them, and
  // OpVariable of these.
  const auto assembly = OldStorageBufferPreamble() + R"(
  ; The preamble declared %100 to be an entry point, so supply it.
  %100 = OpFunction %void None %voidfn
  %entry = OpLabel
  OpReturn
  OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModuleExceptFunctions())
      << assembly << p->error();
  const auto module_str = p->program().to_str();
  EXPECT_THAT(module_str, HasSubstr(R"(
  RTArr -> __array__u32_stride_4
  Struct S {
    [[block]]
    StructMember{[[ offset 0 ]] field0: __u32}
    StructMember{[[ offset 4 ]] field1: __type_name_RTArr}
  }
  Variable{
    Decorations{
      GroupDecoration{0}
      BindingDecoration{0}
    }
    myvar
    storage
    read_write
    __type_name_S
  })"));
}

TEST_F(SpvParserMemoryTest, RemapStorageBuffer_ThroughAccessChain_NonCascaded) {
  const auto assembly = OldStorageBufferPreamble() + R"(
  %100 = OpFunction %void None %voidfn
  %entry = OpLabel

  ; the scalar element
  %1 = OpAccessChain %ptr_uint %myvar %uint_0
  OpStore %1 %uint_0

  ; element in the runtime array
  %2 = OpAccessChain %ptr_uint %myvar %uint_1 %uint_1
  OpStore %2 %uint_0

  OpReturn
  OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  const auto got = ToString(p->builder(), fe.ast_body());
  EXPECT_THAT(got, HasSubstr(R"(Assignment{
  MemberAccessor[not set]{
    Identifier[not set]{myvar}
    Identifier[not set]{field0}
  }
  ScalarConstructor[not set]{0u}
}
Assignment{
  ArrayAccessor[not set]{
    MemberAccessor[not set]{
      Identifier[not set]{myvar}
      Identifier[not set]{field1}
    }
    ScalarConstructor[not set]{1u}
  }
  ScalarConstructor[not set]{0u}
})"));
}

TEST_F(SpvParserMemoryTest,
       RemapStorageBuffer_ThroughAccessChain_NonCascaded_InBoundsAccessChain) {
  // Like the previous test, but using OpInBoundsAccessChain.
  const auto assembly = OldStorageBufferPreamble() + R"(
  %100 = OpFunction %void None %voidfn
  %entry = OpLabel

  ; the scalar element
  %1 = OpInBoundsAccessChain %ptr_uint %myvar %uint_0
  OpStore %1 %uint_0

  ; element in the runtime array
  %2 = OpInBoundsAccessChain %ptr_uint %myvar %uint_1 %uint_1
  OpStore %2 %uint_0

  OpReturn
  OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  const auto got = ToString(p->builder(), fe.ast_body());
  EXPECT_THAT(got, HasSubstr(R"(Assignment{
  MemberAccessor[not set]{
    Identifier[not set]{myvar}
    Identifier[not set]{field0}
  }
  ScalarConstructor[not set]{0u}
}
Assignment{
  ArrayAccessor[not set]{
    MemberAccessor[not set]{
      Identifier[not set]{myvar}
      Identifier[not set]{field1}
    }
    ScalarConstructor[not set]{1u}
  }
  ScalarConstructor[not set]{0u}
})")) << got
      << p->error();
}

TEST_F(SpvParserMemoryTest, RemapStorageBuffer_ThroughAccessChain_Cascaded) {
  const auto assembly = OldStorageBufferPreamble() + R"(
  %ptr_rtarr = OpTypePointer Uniform %arr
  %100 = OpFunction %void None %voidfn
  %entry = OpLabel

  ; get the runtime array
  %1 = OpAccessChain %ptr_rtarr %myvar %uint_1
  ; now an element in it
  %2 = OpAccessChain %ptr_uint %1 %uint_1
  OpStore %2 %uint_0

  OpReturn
  OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()), HasSubstr(R"(Assignment{
  ArrayAccessor[not set]{
    MemberAccessor[not set]{
      Identifier[not set]{myvar}
      Identifier[not set]{field1}
    }
    ScalarConstructor[not set]{1u}
  }
  ScalarConstructor[not set]{0u}
})")) << p->error();
}

TEST_F(SpvParserMemoryTest,
       RemapStorageBuffer_ThroughCopyObject_WithoutHoisting) {
  // Generates a const declaration directly.
  // We have to do a bunch of storage class tracking for locally
  // defined values in order to get the right pointer-to-storage-buffer
  // value type for the const declration.
  const auto assembly = OldStorageBufferPreamble() + R"(
  %100 = OpFunction %void None %voidfn
  %entry = OpLabel

  %1 = OpAccessChain %ptr_uint %myvar %uint_1 %uint_1
  %2 = OpCopyObject %ptr_uint %1
  OpStore %2 %uint_0

  OpReturn
  OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  EXPECT_THAT(ToString(p->builder(), fe.ast_body()),
              HasSubstr(R"(VariableDeclStatement{
  VariableConst{
    x_2
    none
    undefined
    __ptr_storage__u32
    {
      UnaryOp[not set]{
        address-of
        ArrayAccessor[not set]{
          MemberAccessor[not set]{
            Identifier[not set]{myvar}
            Identifier[not set]{field1}
          }
          ScalarConstructor[not set]{1u}
        }
      }
    }
  }
}
Assignment{
  UnaryOp[not set]{
    indirection
    Identifier[not set]{x_2}
  }
  ScalarConstructor[not set]{0u}
})")) << p->error();

  p->SkipDumpingPending(
      "crbug.com/tint/1041 track access mode in spirv-reader parser type");
}

TEST_F(SpvParserMemoryTest, RemapStorageBuffer_ThroughCopyObject_WithHoisting) {
  // TODO(dneto): Hoisting non-storable values (pointers) is not yet supported.
  // It's debatable whether this test should run at all.
  // crbug.com/tint/98

  // Like the previous test, but the declaration for the copy-object
  // has its declaration hoisted.
  const auto assembly = OldStorageBufferPreamble() + R"(
  %bool = OpTypeBool
  %cond = OpConstantTrue %bool

  %100 = OpFunction %void None %voidfn

  %entry = OpLabel
  OpSelectionMerge %99 None
  OpBranchConditional %cond %20 %30

  %20 = OpLabel
  %1 = OpAccessChain %ptr_uint %myvar %uint_1 %uint_1
  ; this definintion dominates the use in %99
  %2 = OpCopyObject %ptr_uint %1
  OpBranch %99

  %30 = OpLabel
  OpReturn

  %99 = OpLabel
  OpStore %2 %uint_0
  OpReturn

  OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  EXPECT_EQ(ToString(p->builder(), fe.ast_body()),
            R"(VariableDeclStatement{
  Variable{
    x_2
    none
    undefined
    __ptr_storage__u32
  }
}
If{
  (
    ScalarConstructor[not set]{true}
  )
  {
    Assignment{
      Identifier[not set]{x_2}
      UnaryOp[not set]{
        address-of
        ArrayAccessor[not set]{
          MemberAccessor[not set]{
            Identifier[not set]{myvar}
            Identifier[not set]{field1}
          }
          ScalarConstructor[not set]{1u}
        }
      }
    }
  }
}
Else{
  {
    Return{}
  }
}
Assignment{
  Identifier[not set]{x_2}
  ScalarConstructor[not set]{0u}
}
Return{}
)") << p->error();
  p->SkipDumpingPending("crbug.com/tint/98");
}

TEST_F(SpvParserMemoryTest, DISABLED_RemapStorageBuffer_ThroughFunctionCall) {
  // WGSL does not support pointer-to-storage-buffer as function parameter
}
TEST_F(SpvParserMemoryTest,
       DISABLED_RemapStorageBuffer_ThroughFunctionParameter) {
  // WGSL does not support pointer-to-storage-buffer as function parameter
}

std::string RuntimeArrayPreamble() {
  return R"(
     OpCapability Shader
     OpMemoryModel Logical Simple
     OpEntryPoint Fragment %100 "main"
     OpExecutionMode %100 OriginUpperLeft

     OpName %myvar "myvar"
     OpMemberName %struct 0 "first"
     OpMemberName %struct 1 "rtarr"

     OpDecorate %struct Block
     OpMemberDecorate %struct 0 Offset 0
     OpMemberDecorate %struct 1 Offset 4
     OpDecorate %arr ArrayStride 4

     OpDecorate %myvar DescriptorSet 0
     OpDecorate %myvar Binding 0

     %void = OpTypeVoid
     %voidfn = OpTypeFunction %void
     %uint = OpTypeInt 32 0

     %uint_0 = OpConstant %uint 0
     %uint_1 = OpConstant %uint 1

     %arr = OpTypeRuntimeArray %uint
     %struct = OpTypeStruct %uint %arr
     %ptr_struct = OpTypePointer StorageBuffer %struct
     %ptr_uint = OpTypePointer StorageBuffer %uint

     %myvar = OpVariable %ptr_struct StorageBuffer
  )";
}

TEST_F(SpvParserMemoryTest, ArrayLength_FromVar) {
  const auto assembly = RuntimeArrayPreamble() + R"(

  %100 = OpFunction %void None %voidfn

  %entry = OpLabel
  %1 = OpArrayLength %uint %myvar 1
  OpReturn
  OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  const auto body_str = ToString(p->builder(), fe.ast_body());
  EXPECT_THAT(body_str, HasSubstr(R"(VariableDeclStatement{
  VariableConst{
    x_1
    none
    undefined
    __u32
    {
      Call[not set]{
        Identifier[not set]{arrayLength}
        (
          UnaryOp[not set]{
            address-of
            MemberAccessor[not set]{
              Identifier[not set]{myvar}
              Identifier[not set]{rtarr}
            }
          }
        )
      }
    }
  }
}
)")) << body_str;
}

TEST_F(SpvParserMemoryTest, ArrayLength_FromCopyObject) {
  const auto assembly = RuntimeArrayPreamble() + R"(

  %100 = OpFunction %void None %voidfn

  %entry = OpLabel
  %2 = OpCopyObject %ptr_struct %myvar
  %1 = OpArrayLength %uint %2 1
  OpReturn
  OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  const auto body_str = ToString(p->builder(), fe.ast_body());
  EXPECT_THAT(body_str, HasSubstr(R"(VariableDeclStatement{
  VariableConst{
    x_2
    none
    undefined
    __ptr_storage__type_name_S
    {
      UnaryOp[not set]{
        address-of
        Identifier[not set]{myvar}
      }
    }
  }
}
VariableDeclStatement{
  VariableConst{
    x_1
    none
    undefined
    __u32
    {
      Call[not set]{
        Identifier[not set]{arrayLength}
        (
          UnaryOp[not set]{
            address-of
            MemberAccessor[not set]{
              UnaryOp[not set]{
                indirection
                Identifier[not set]{x_2}
              }
              Identifier[not set]{rtarr}
            }
          }
        )
      }
    }
  }
}
)")) << body_str;

  p->SkipDumpingPending(
      "crbug.com/tint/1041 track access mode in spirv-reader parser type");
}

TEST_F(SpvParserMemoryTest, ArrayLength_FromAccessChain) {
  const auto assembly = RuntimeArrayPreamble() + R"(

  %100 = OpFunction %void None %voidfn

  %entry = OpLabel
  %2 = OpAccessChain %ptr_struct %myvar ; no indices
  %1 = OpArrayLength %uint %2 1
  OpReturn
  OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << assembly << p->error();
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  const auto body_str = ToString(p->builder(), fe.ast_body());
  EXPECT_THAT(body_str, HasSubstr(R"(VariableDeclStatement{
  VariableConst{
    x_1
    none
    undefined
    __u32
    {
      Call[not set]{
        Identifier[not set]{arrayLength}
        (
          UnaryOp[not set]{
            address-of
            MemberAccessor[not set]{
              Identifier[not set]{myvar}
              Identifier[not set]{rtarr}
            }
          }
        )
      }
    }
  }
}
)")) << body_str;
}

std::string InvalidPointerPreamble() {
  return R"(
OpCapability Shader
OpMemoryModel Logical Simple
OpEntryPoint Fragment %main "main"
OpExecutionMode %main OriginUpperLeft

%uint = OpTypeInt 32 0
%ptr_ty = OpTypePointer Function %uint

  %void = OpTypeVoid
%voidfn = OpTypeFunction %void
)";
}

TEST_F(SpvParserMemoryTest, InvalidPointer_Undef_ModuleScope_IsError) {
  const std::string assembly = InvalidPointerPreamble() + R"(
 %ptr = OpUndef %ptr_ty

  %main = OpFunction %void None %voidfn
 %entry = OpLabel
     %1 = OpCopyObject %ptr_ty %ptr
     %2 = OpAccessChain %ptr_ty %ptr
     %3 = OpInBoundsAccessChain %ptr_ty %ptr
; now show the invalid pointer propagates
     %10 = OpCopyObject %ptr_ty %1
     %20 = OpAccessChain %ptr_ty %2
     %30 = OpInBoundsAccessChain %ptr_ty %3
          OpReturn
          OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  EXPECT_FALSE(p->BuildAndParseInternalModule()) << assembly;
  EXPECT_EQ(p->error(), "undef pointer is not valid: %9 = OpUndef %6");
}

TEST_F(SpvParserMemoryTest, InvalidPointer_Undef_FunctionScope_IsError) {
  const std::string assembly = InvalidPointerPreamble() + R"(

  %main = OpFunction %void None %voidfn
 %entry = OpLabel
   %ptr = OpUndef %ptr_ty
          OpReturn
          OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  EXPECT_FALSE(p->BuildAndParseInternalModule()) << assembly;
  EXPECT_EQ(p->error(), "undef pointer is not valid: %7 = OpUndef %3");
}

TEST_F(SpvParserMemoryTest, InvalidPointer_ConstantNull_IsError) {
  // OpConstantNull on logical pointer requires variable-pointers, which
  // is not (yet) supported by WGSL features.
  const std::string assembly = InvalidPointerPreamble() + R"(
 %ptr = OpConstantNull %ptr_ty

  %main = OpFunction %void None %voidfn
 %entry = OpLabel
     %1 = OpCopyObject %ptr_ty %ptr
     %2 = OpAccessChain %ptr_ty %ptr
     %3 = OpInBoundsAccessChain %ptr_ty %ptr
; now show the invalid pointer propagates
     %10 = OpCopyObject %ptr_ty %1
     %20 = OpAccessChain %ptr_ty %2
     %30 = OpInBoundsAccessChain %ptr_ty %3
          OpReturn
          OpFunctionEnd
)";
  auto p = parser(test::Assemble(assembly));
  EXPECT_FALSE(p->BuildAndParseInternalModule());
  EXPECT_EQ(p->error(), "null pointer is not valid: %9 = OpConstantNull %6");
}

}  // namespace
}  // namespace spirv
}  // namespace reader
}  // namespace tint