Method TestSkipCache

be/src/codegen/llvm-codegen-cache-test.cc:434–469

Test the case if we have a cache but doesn't contain the function we want, should switch to the cache missing path.

/// Test the case if we have a cache but doesn't contain the function
/// we want, should switch to the cache missing path.
void LlvmCodeGenCacheTest::TestSkipCache() {
  // Initial a LlvmCodeGen object with a normal function.
  scoped_ptr<LlvmCodeGen> codegen;
  ASSERT_OK(LlvmCodeGen::CreateImpalaCodegen(fragment_state_, nullptr, "test", &codegen));
  AddLlvmCodegenEcho(codegen.get());
  // Create an empty function from other LlvmCodeGen to create the failure later.
  scoped_ptr<LlvmCodeGen> codegen_empty;
  ASSERT_OK(LlvmCodeGen::CreateImpalaCodegen(
      fragment_state_, nullptr, "test_empty", &codegen_empty));
  llvm::Function* empty_func;
  GetLlvmEmptyFunction(codegen_empty.get(), &empty_func);

  test_env_->ResetCodegenCache(metrics_.get());
  EXPECT_OK(test_env_->codegen_cache()->Init(CODEGEN_CACHE_CAPACITY));

  CheckMetrics(test_env_->codegen_cache(), 0 /*hit*/, 0 /*miss*/, 0 /*evict*/);
  CodeGenCacheKey cache_key;
  string key = "key";
  CodeGenCacheKeyConstructor::construct(key, &cache_key);
  codegen->GenerateFunctionNamesHashCode();
  // Store and lookup the entry by the key, should be successful.
  EXPECT_OK(codegen->StoreCache(cache_key));
  EXPECT_TRUE(codegen->LookupCache(cache_key));
  CheckMetrics(test_env_->codegen_cache(), 1 /*hit*/, 0 /*miss*/, 0 /*evict*/);
  CodegenFnPtr<TestEmpty> fn_ptr;
  // Insert a new function to the codegen, and regenerate the function names hash
  // code, expect a failure because the hash code inconsistency with the code in
  // the cache.
  codegen->AddFunctionToJitInternal(empty_func, &fn_ptr);
  codegen->GenerateFunctionNamesHashCode();
  // Expect a look up failure.
  EXPECT_FALSE(codegen->LookupCache(cache_key));
  CheckMetrics(test_env_->codegen_cache(), 1 /*hit*/, 1 /*miss*/, 0 /*evict*/);
  codegen->Close();
  codegen_empty->Close();
}

// Test the basic function of using the codegen cache.
TEST_F(LlvmCodeGenCacheTest, BasicFunction) {