mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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f62357e7b8
This transformation, given the header of a selection construct with branching instruction OpBranchConditional, flattens it. Side-effecting operations such as OpLoad, OpStore and OpFunctionCall are enclosed within smaller conditionals. It is applicable if the construct does not contain inner selection constructs or loops, or atomic or barrier instructions. The corresponding fuzzer pass looks for selection headers and tries to flatten them. Needed for the issue #3544, but it does not fix it completely.
135 lines
4.5 KiB
C++
135 lines
4.5 KiB
C++
// Copyright (c) 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/fuzz/comparator_deep_blocks_first.h"
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#include "source/fuzz/fact_manager/fact_manager.h"
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#include "source/fuzz/pseudo_random_generator.h"
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#include "source/fuzz/transformation_context.h"
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#include "test/fuzz/fuzz_test_util.h"
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namespace spvtools {
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namespace fuzz {
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namespace {
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std::string shader = R"(
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OpCapability Shader
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%1 = OpExtInstImport "GLSL.std.450"
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OpMemoryModel Logical GLSL450
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OpEntryPoint Fragment %2 "main"
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OpExecutionMode %2 OriginUpperLeft
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OpSource ESSL 310
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%3 = OpTypeVoid
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%4 = OpTypeFunction %3
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%5 = OpTypeBool
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%6 = OpConstantTrue %5
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%7 = OpTypeInt 32 1
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%8 = OpTypePointer Function %7
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%9 = OpConstant %7 1
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%10 = OpConstant %7 10
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%11 = OpConstant %7 2
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%2 = OpFunction %3 None %4
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%12 = OpLabel
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OpSelectionMerge %13 None
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OpBranchConditional %6 %14 %15
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%14 = OpLabel
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OpBranch %13
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%15 = OpLabel
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OpBranch %16
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%16 = OpLabel
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OpLoopMerge %17 %18 None
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OpBranch %19
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%19 = OpLabel
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OpBranchConditional %6 %20 %17
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%20 = OpLabel
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OpSelectionMerge %21 None
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OpBranchConditional %6 %22 %23
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%22 = OpLabel
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OpBranch %21
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%23 = OpLabel
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OpBranch %21
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%21 = OpLabel
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OpBranch %18
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%18 = OpLabel
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OpBranch %16
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%17 = OpLabel
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OpBranch %13
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%13 = OpLabel
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OpReturn
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OpFunctionEnd
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)";
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TEST(ComparatorDeepBlocksFirstTest, Compare) {
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const auto env = SPV_ENV_UNIVERSAL_1_5;
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const auto consumer = nullptr;
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const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
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ASSERT_TRUE(IsValid(env, context.get()));
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FactManager fact_manager;
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spvtools::ValidatorOptions validator_options;
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TransformationContext transformation_context(&fact_manager,
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validator_options);
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auto is_deeper = ComparatorDeepBlocksFirst(context.get());
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// The block ids and the corresponding depths are:
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// 12, 13 -> depth 0
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// 14, 15, 16, 17 -> depth 1
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// 18, 19, 20, 21 -> depth 2
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// 22, 23 -> depth 3
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// Perform some comparisons and check that they return true iff the first
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// block is deeper than the second.
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ASSERT_FALSE(is_deeper(12, 12));
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ASSERT_FALSE(is_deeper(12, 13));
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ASSERT_FALSE(is_deeper(12, 14));
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ASSERT_FALSE(is_deeper(12, 18));
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ASSERT_FALSE(is_deeper(12, 22));
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ASSERT_TRUE(is_deeper(14, 12));
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ASSERT_FALSE(is_deeper(14, 15));
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ASSERT_FALSE(is_deeper(15, 14));
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ASSERT_FALSE(is_deeper(14, 18));
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ASSERT_TRUE(is_deeper(18, 12));
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ASSERT_TRUE(is_deeper(18, 16));
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}
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TEST(ComparatorDeepBlocksFirstTest, Sort) {
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const auto env = SPV_ENV_UNIVERSAL_1_5;
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const auto consumer = nullptr;
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const auto context = BuildModule(env, consumer, shader, kFuzzAssembleOption);
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ASSERT_TRUE(IsValid(env, context.get()));
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FactManager fact_manager;
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spvtools::ValidatorOptions validator_options;
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TransformationContext transformation_context(&fact_manager,
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validator_options);
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// Check that, sorting using the comparator, the blocks are ordered from more
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// deeply nested to less deeply nested.
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// 17 has depth 1, 20 has depth 2, 13 has depth 0.
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std::vector<opt::BasicBlock*> blocks = {context->get_instr_block(17),
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context->get_instr_block(20),
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context->get_instr_block(13)};
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std::sort(blocks.begin(), blocks.end(),
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ComparatorDeepBlocksFirst(context.get()));
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// Check that the blocks are in the correct order.
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ASSERT_EQ(blocks[0]->id(), 20);
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ASSERT_EQ(blocks[1]->id(), 17);
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ASSERT_EQ(blocks[2]->id(), 13);
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}
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} // namespace
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} // namespace fuzz
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} // namespace spvtools
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