spirv-fuzz: Add minimal SPIR-V example to test shaders (#4415)
Testing on ClusterFuzz has revealed that the fuzzer sometimes goes
wrong when a shader is very simple - e.g., there have been bugs where
a fuzzer pass has assumed that at least one basic type exists in the
module. This change adds an almost empty SPIR-V example to the shaders
used for testing, to help catch such cases locally.
diff --git a/test/fuzz/fuzzer_replayer_test.cpp b/test/fuzz/fuzzer_replayer_test.cpp
index a80bd37..2a22e6a 100644
--- a/test/fuzz/fuzzer_replayer_test.cpp
+++ b/test/fuzz/fuzzer_replayer_test.cpp
@@ -1596,6 +1596,23 @@
OpFunctionEnd
)";
+// A virtually empty piece of SPIR-V.
+
+const std::string kTestShader7 = R"(
+ OpCapability Shader
+ %1 = OpExtInstImport "GLSL.std.450"
+ OpMemoryModel Logical GLSL450
+ OpEntryPoint Fragment %4 "main"
+ OpExecutionMode %4 OriginUpperLeft
+ OpSource ESSL 320
+ %2 = OpTypeVoid
+ %3 = OpTypeFunction %2
+ %4 = OpFunction %2 None %3
+ %5 = OpLabel
+ OpReturn
+ OpFunctionEnd
+ )";
+
void AddConstantUniformFact(protobufs::FactSequence* facts,
uint32_t descriptor_set, uint32_t binding,
std::vector<uint32_t>&& indices, uint32_t value) {
@@ -1760,6 +1777,13 @@
kNumFuzzerRuns);
}
+TEST(FuzzerReplayerTest, Miscellaneous7) {
+ // Do some fuzzer runs, starting from an initial seed of 1 (seed value chosen
+ // arbitrarily).
+ RunFuzzerAndReplayer(kTestShader7, protobufs::FactSequence(), 1,
+ kNumFuzzerRuns);
+}
+
} // namespace
} // namespace fuzz
} // namespace spvtools
