// 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/tint/reader/spirv/parser_impl_test_helper.h"
#include "src/tint/reader/spirv/spirv_tools_helpers_test.h"

namespace tint::reader::spirv {
namespace {

using ::testing::Eq;
using ::testing::UnorderedElementsAre;

using SpvParserGetDecorationsTest = SpvParserTest;

const char* kSkipReason = "This example is deliberately a SPIR-V fragment";

TEST_F(SpvParserGetDecorationsTest, GetDecorationsFor_NotAnId) {
    auto p = parser(test::Assemble(""));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsFor(42);
    EXPECT_TRUE(decorations.empty());
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsFor_NoDecorations) {
    auto p = parser(test::Assemble("%1 = OpTypeVoid"));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsFor(1);
    EXPECT_TRUE(decorations.empty());
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsFor_OneDecoration) {
    auto p = parser(test::Assemble(R"(
    OpDecorate %10 Block
    %float = OpTypeFloat 32
    %10 = OpTypeStruct %float
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsFor(10);
    EXPECT_THAT(decorations, UnorderedElementsAre(Decoration{SpvDecorationBlock}));
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsFor_Duplicate) {
    auto p = parser(test::Assemble(R"(
    OpDecorate %10 Block
    OpDecorate %10 Block
    %float = OpTypeFloat 32
    %10 = OpTypeStruct %float
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsFor(10);
    EXPECT_THAT(decorations, UnorderedElementsAre(Decoration{SpvDecorationBlock}));
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsFor_MultiDecoration) {
    auto p = parser(test::Assemble(R"(
    OpDecorate %5 RelaxedPrecision
    OpDecorate %5 Location 7      ; Invalid case made up for test
    %float = OpTypeFloat 32
    %5 = OpConstant %float 3.14
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsFor(5);
    EXPECT_THAT(decorations, UnorderedElementsAre(Decoration{SpvDecorationRelaxedPrecision},
                                                  Decoration{SpvDecorationLocation, 7}));
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsForMember_NotAnId) {
    auto p = parser(test::Assemble(""));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsForMember(42, 9);
    EXPECT_TRUE(decorations.empty());
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsForMember_NotAStruct) {
    auto p = parser(test::Assemble("%1 = OpTypeVoid"));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsFor(1);
    EXPECT_TRUE(decorations.empty());
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsForMember_MemberWithoutDecoration) {
    auto p = parser(test::Assemble(R"(
    %uint = OpTypeInt 32 0
    %10 = OpTypeStruct %uint
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsForMember(10, 0);
    EXPECT_TRUE(decorations.empty());
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsForMember_RelaxedPrecision) {
    auto p = parser(test::Assemble(R"(
    OpMemberDecorate %10 0 RelaxedPrecision
    %float = OpTypeFloat 32
    %10 = OpTypeStruct %float
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule()) << p->error();
    auto decorations = p->GetDecorationsForMember(10, 0);
    EXPECT_THAT(decorations, UnorderedElementsAre(Decoration{SpvDecorationRelaxedPrecision}));
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsForMember_Duplicate) {
    auto p = parser(test::Assemble(R"(
    OpMemberDecorate %10 0 RelaxedPrecision
    OpMemberDecorate %10 0 RelaxedPrecision
    %float = OpTypeFloat 32
    %10 = OpTypeStruct %float
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule()) << p->error();
    auto decorations = p->GetDecorationsForMember(10, 0);
    EXPECT_THAT(decorations, UnorderedElementsAre(Decoration{SpvDecorationRelaxedPrecision}));
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

// TODO(dneto): Enable when ArrayStride is handled
TEST_F(SpvParserGetDecorationsTest, DISABLED_GetDecorationsForMember_OneDecoration) {
    auto p = parser(test::Assemble(R"(
    OpMemberDecorate %10 1 ArrayStride 12
    %uint = OpTypeInt 32 0
    %uint_2 = OpConstant %uint 2
    %arr = OpTypeArray %uint %uint_2
    %10 = OpTypeStruct %uint %arr
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule()) << p->error();
    auto decorations = p->GetDecorationsForMember(10, 1);
    EXPECT_THAT(decorations, UnorderedElementsAre(Decoration{SpvDecorationArrayStride, 12}));
    EXPECT_TRUE(p->error().empty());
}

// TODO(dneto): Enable when ArrayStride, MatrixStride, ColMajor are handled
// crbug.com/tint/30 for ArrayStride
// crbug.com/tint/31 for matrix layout
TEST_F(SpvParserGetDecorationsTest, DISABLED_GetDecorationsForMember_MultiDecoration) {
    auto p = parser(test::Assemble(R"(
    OpMemberDecorate %50 1 RelaxedPrecision
    OpMemberDecorate %50 2 ArrayStride 16
    OpMemberDecorate %50 2 MatrixStride 8
    OpMemberDecorate %50 2 ColMajor
    %float = OpTypeFloat 32
    %vec = OpTypeVector %float 2
    %mat = OpTypeMatrix %vec 2
    %uint = OpTypeInt 32 0
    %uint_2 = OpConstant %uint 2
    %arr = OpTypeArray %mat %uint_2
    %50 = OpTypeStruct %uint %float %arr
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule()) << p->error();

    EXPECT_TRUE(p->GetDecorationsForMember(50, 0).empty());
    EXPECT_THAT(p->GetDecorationsForMember(50, 1),
                UnorderedElementsAre(Decoration{SpvDecorationRelaxedPrecision}));
    EXPECT_THAT(p->GetDecorationsForMember(50, 2),
                UnorderedElementsAre(Decoration{SpvDecorationColMajor},
                                     Decoration{SpvDecorationMatrixStride, 8},
                                     Decoration{SpvDecorationArrayStride, 16}));
    EXPECT_TRUE(p->error().empty());
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsFor_Restrict) {
    // RestrictPointer applies to a memory object declaration. Use a variable.
    auto p = parser(test::Assemble(R"(
    OpDecorate %10 Restrict
    %float = OpTypeFloat 32
    %ptr = OpTypePointer Workgroup %float
    %10 = OpVariable %ptr Workgroup
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsFor(10);
    EXPECT_TRUE(decorations.empty());
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsForMember_Restrict) {
    // Restrict applies to a memory object declaration.
    // But OpMemberDecorate can only be applied to a structure type.
    // Test the reader's ability to be resilient to more than what SPIR-V allows.
    auto p = parser(test::Assemble(R"(
    OpMemberDecorate %10 0 Restrict
    %float = OpTypeFloat 32
    %10 = OpTypeStruct %float
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule());
    auto decorations = p->GetDecorationsForMember(10, 0);
    EXPECT_TRUE(decorations.empty());
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsFor_RestrictPointer) {
    // RestrictPointer applies to a memory object declaration. Use a variable.
    auto p = parser(test::Assemble(R"(
    OpDecorate %10 RestrictPointer
    %float = OpTypeFloat 32
    %ptr = OpTypePointer Workgroup %float
    %10 = OpVariable %ptr Workgroup
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule()) << p->error();
    auto decorations = p->GetDecorationsFor(10);
    EXPECT_TRUE(decorations.empty());
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

TEST_F(SpvParserGetDecorationsTest, GetDecorationsForMember_RestrictPointer) {
    // RestrictPointer applies to a memory object declaration.
    // But OpMemberDecorate can only be applied to a structure type.
    // Test the reader's ability to be resilient to more than what SPIR-V allows.
    auto p = parser(test::Assemble(R"(
    OpMemberDecorate %10 0 RestrictPointer
    %float = OpTypeFloat 32
    %10 = OpTypeStruct %float
  )"));
    EXPECT_TRUE(p->BuildAndParseInternalModule()) << p->error();
    auto decorations = p->GetDecorationsFor(10);
    EXPECT_TRUE(decorations.empty());
    EXPECT_TRUE(p->error().empty());
    p->SkipDumpingPending(kSkipReason);
}

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