spirv-fuzz: Pass OpUndef in function call if needed (#3978)

Fixes #3977.
KhronosGroup · Oct 22, 2020 · 53f2a69 · 53f2a69
1 parent de2c0ba
commit 53f2a69
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/source/fuzz/fuzzer_pass_add_function_calls.cpp b/source/fuzz/fuzzer_pass_add_function_calls.cpp
@@ -141,9 +141,13 @@ std::vector<uint32_t> FuzzerPassAddFunctionCalls::ChooseFunctionCallArguments(
     assert(param_type && "Parameter has invalid type");
 
     if (!param_type->AsPointer()) {
-      // We mark the constant as irrelevant so that we can replace it with a
-      // more interesting value later.
-      result.push_back(FindOrCreateZeroConstant(param->type_id(), true));
+      if (fuzzerutil::CanCreateConstant(GetIRContext(), param->type_id())) {
+        // We mark the constant as irrelevant so that we can replace it with a
+        // more interesting value later.
+        result.push_back(FindOrCreateZeroConstant(param->type_id(), true));
+      } else {
+        result.push_back(FindOrCreateGlobalUndef(param->type_id()));
+      }
       continue;
     }