src/tint/lang/spirv/reader/ast_parser/parser_test.cc

// Copyright 2020 The Dawn & Tint Authors
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#include "src/tint/lang/spirv/reader/ast_parser/parse.h"

#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "src/tint/lang/spirv/reader/ast_parser/spirv_tools_helpers_test.h"

namespace tint::spirv::reader::ast_parser {
namespace {

using ParserTest = testing::Test;

TEST_F(ParserTest, DataEmpty) {
    std::vector<uint32_t> data;
    auto program = Parse(data, {});
    auto errs = program.Diagnostics().str();
    ASSERT_FALSE(program.IsValid()) << errs;
    EXPECT_EQ(errs, "error: line:0: Invalid SPIR-V magic number.");
}

constexpr auto kShaderWithNonUniformDerivative = R"(
               OpCapability Shader
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %foo "foo" %x
               OpExecutionMode %foo OriginUpperLeft
               OpDecorate %x Location 0
      %float = OpTypeFloat 32
%_ptr_Input_float = OpTypePointer Input %float
          %x = OpVariable %_ptr_Input_float Input
       %void = OpTypeVoid
    %float_0 = OpConstantNull %float
       %bool = OpTypeBool
  %func_type = OpTypeFunction %void
        %foo = OpFunction %void None %func_type
  %foo_start = OpLabel
    %x_value = OpLoad %float %x
  %condition = OpFOrdGreaterThan %bool %x_value %float_0
               OpSelectionMerge %merge None
               OpBranchConditional %condition %true_branch %merge
%true_branch = OpLabel
     %result = OpDPdx %float %x_value
               OpBranch %merge
      %merge = OpLabel
               OpReturn
               OpFunctionEnd
)";

TEST_F(ParserTest, AllowNonUniformDerivatives_False) {
    auto spv = test::Assemble(kShaderWithNonUniformDerivative);
    Options options;
    options.allow_non_uniform_derivatives = false;
    auto program = Parse(spv, options);
    auto errs = program.Diagnostics().str();
    EXPECT_FALSE(program.IsValid()) << errs;
    EXPECT_THAT(errs, ::testing::HasSubstr("'dpdx' must only be called from uniform control flow"));
}

TEST_F(ParserTest, AllowNonUniformDerivatives_True) {
    auto spv = test::Assemble(kShaderWithNonUniformDerivative);
    Options options;
    options.allow_non_uniform_derivatives = true;
    auto program = Parse(spv, options);
    auto errs = program.Diagnostics().str();
    EXPECT_TRUE(program.IsValid()) << errs;
    EXPECT_EQ(program.Diagnostics().count(), 0u) << errs;
}

TEST_F(ParserTest, WorkgroupIdGuardingBarrier) {
    auto spv = test::Assemble(R"(
               OpCapability Shader
               OpMemoryModel Logical GLSL450
               OpEntryPoint GLCompute %foo "foo" %wgid
               OpExecutionMode %foo LocalSize 1 1 1
               OpDecorate %wgid BuiltIn WorkgroupId
       %uint = OpTypeInt 32 0
      %vec3u = OpTypeVector %uint 3
%_ptr_Input_vec3u = OpTypePointer Input %vec3u
     %uint_0 = OpConstant %uint 0
     %uint_2 = OpConstant %uint 2
   %uint_264 = OpConstant %uint 264
       %wgid = OpVariable %_ptr_Input_vec3u Input
       %void = OpTypeVoid
       %bool = OpTypeBool
  %func_type = OpTypeFunction %void
        %foo = OpFunction %void None %func_type
  %foo_start = OpLabel
 %wgid_value = OpLoad %vec3u %wgid
     %wgid_x = OpCompositeExtract %uint %wgid_value 0
  %condition = OpIEqual %bool %wgid_x %uint_0
               OpSelectionMerge %merge None
               OpBranchConditional %condition %true_branch %merge
%true_branch = OpLabel
               OpControlBarrier %uint_2 %uint_2 %uint_264
               OpBranch %merge
      %merge = OpLabel
               OpReturn
               OpFunctionEnd
)");
    auto program = Parse(spv, {});
    auto errs = program.Diagnostics().str();
    EXPECT_TRUE(program.IsValid()) << errs;
    EXPECT_EQ(program.Diagnostics().count(), 0u) << errs;
}

// TODO(dneto): uint32 vec, valid SPIR-V
// TODO(dneto): uint32 vec, invalid SPIR-V

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