[wasm] [test] Introduce enum for runtime exception support

We were using a boolean before, which makes the meaning non-obvious
when passed as a parameter. With the enum, you actually have to use
{kRuntimeExceptionSupport} or {kNoRuntimeExceptionSupport}.

R=mtrofin@chromium.org

Change-Id: Iaf5a7b6f1b446d4c3e16e044a6055d923d3b0b49
Reviewed-on: https://chromium-review.googlesource.com/660738
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Mircea Trofin <mtrofin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47969}

src/compiler/wasm-compiler.cc

@@ -194,7 +194,7 @@ void WasmGraphBuilder::StackCheck(wasm::WasmCodePosition position,
                                   Node** effect, Node** control) {
   // TODO(mtrofin): "!env_" happens when we generate a wrapper.
   // We should factor wrappers separately from wasm codegen.
-  if (FLAG_wasm_no_stack_checks || !env_ || !has_runtime_exception_support_) {
+  if (FLAG_wasm_no_stack_checks || !env_ || !runtime_exception_support_) {
     return;
   }
   if (effect == nullptr) effect = effect_;
@@ -830,7 +830,7 @@ Node* WasmGraphBuilder::BranchExpectFalse(Node* cond, Node** true_node,
 }
 
 Builtins::Name WasmGraphBuilder::GetBuiltinIdForTrap(wasm::TrapReason reason) {
-  if (!has_runtime_exception_support_) {
+  if (runtime_exception_support_ == kNoRuntimeExceptionSupport) {
     // We use Builtins::builtin_count as a marker to tell the code generator
     // to generate a call to a testing c-function instead of a runtime
     // function. This code should only be called from a cctest.

src/compiler/wasm-compiler.h

@@ -78,6 +78,11 @@ struct ModuleEnv {
   const uintptr_t globals_start;
 };
 
+enum RuntimeExceptionSupport : bool {
+  kRuntimeExceptionSupport = true,
+  kNoRuntimeExceptionSupport = false
+};
+
 class WasmCompilationUnit final {
  public:
   // If constructing from a background thread, pass in a Counters*, and ensure
@@ -317,8 +322,8 @@ class WasmGraphBuilder {
 
   bool has_simd() const { return has_simd_; }
 
-  void SetRuntimeExceptionSupport(bool value) {
-    has_runtime_exception_support_ = value;
+  void set_runtime_exception_support(RuntimeExceptionSupport value) {
+    runtime_exception_support_ = value;
   }
 
   const wasm::WasmModule* module() { return env_ ? env_->module : nullptr; }
@@ -345,7 +350,7 @@ class WasmGraphBuilder {
   // If the runtime doesn't support exception propagation,
   // we won't generate stack checks, and trap handling will also
   // be generated differently.
-  bool has_runtime_exception_support_ = true;
+  RuntimeExceptionSupport runtime_exception_support_ = kRuntimeExceptionSupport;
 
   wasm::FunctionSig* sig_;
   SetOncePointer<const Operator> allocate_heap_number_operator_;

test/cctest/wasm/test-run-wasm.cc

@@ -1951,7 +1951,8 @@ static void TestBuildGraphForSimpleExpression(WasmOpcode opcode) {
     byte code[] = {WASM_NO_LOCALS, kExprGetLocal, 0, static_cast<byte>(opcode),
                    WASM_END};
     TestBuildingGraph(&zone, &jsgraph, nullptr, sig, nullptr, code,
-                      code + arraysize(code));
+                      code + arraysize(code),
+                      compiler::kNoRuntimeExceptionSupport);
   } else {
     CHECK_EQ(2, sig->parameter_count());
     byte code[] = {WASM_NO_LOCALS,
@@ -1962,7 +1963,8 @@ static void TestBuildGraphForSimpleExpression(WasmOpcode opcode) {
                    static_cast<byte>(opcode),
                    WASM_END};
     TestBuildingGraph(&zone, &jsgraph, nullptr, sig, nullptr, code,
-                      code + arraysize(code));
+                      code + arraysize(code),
+                      compiler::kNoRuntimeExceptionSupport);
   }
 }
 

test/cctest/wasm/test-wasm-stack.cc

@@ -155,7 +155,8 @@ TEST(CollectDetailedWasmStack_WasmError) {
     int unreachable_pos = 1 << (8 * pos_shift);
     TestSignatures sigs;
     // Create a WasmRunner with stack checks and traps enabled.
-    WasmRunner<int> r(kExecuteCompiled, "main", true);
+    WasmRunner<int> r(kExecuteCompiled, "main",
+                      compiler::kRuntimeExceptionSupport);
 
     std::vector<byte> code(unreachable_pos + 1, kExprNop);
     code[unreachable_pos] = kExprUnreachable;

test/cctest/wasm/test-wasm-trap-position.cc

@@ -68,7 +68,8 @@ void CheckExceptionInfos(v8::internal::Isolate* i_isolate, Handle<Object> exc,
 // Trigger a trap for executing unreachable.
 TEST(Unreachable) {
   // Create a WasmRunner with stack checks and traps enabled.
-  WasmRunner<void> r(kExecuteCompiled, "main", true);
+  WasmRunner<void> r(kExecuteCompiled, "main",
+                     compiler::kRuntimeExceptionSupport);
   TestSignatures sigs;
 
   BUILD(r, WASM_UNREACHABLE);
@@ -102,7 +103,8 @@ TEST(Unreachable) {
 
 // Trigger a trap for loading from out-of-bounds.
 TEST(IllegalLoad) {
-  WasmRunner<void> r(kExecuteCompiled, "main", true);
+  WasmRunner<void> r(kExecuteCompiled, "main",
+                     compiler::kRuntimeExceptionSupport);
   TestSignatures sigs;
 
   r.builder().AddMemory(0L);

test/cctest/wasm/wasm-run-utils.cc

@@ -239,15 +239,15 @@ Handle<WasmInstanceObject> TestingModuleBuilder::InitInstanceObject() {
   return WasmInstanceObject::New(isolate_, compiled_module);
 }
 
-void TestBuildingGraph(Zone* zone, compiler::JSGraph* jsgraph,
-                       compiler::ModuleEnv* module, FunctionSig* sig,
-                       compiler::SourcePositionTable* source_position_table,
+void TestBuildingGraph(
+    Zone* zone, compiler::JSGraph* jsgraph, compiler::ModuleEnv* module,
+    FunctionSig* sig, compiler::SourcePositionTable* source_position_table,
     const byte* start, const byte* end,
-                       bool runtime_exception_support) {
+    compiler::RuntimeExceptionSupport runtime_exception_support) {
   compiler::WasmGraphBuilder builder(
       module, zone, jsgraph, CEntryStub(jsgraph->isolate(), 1).GetCode(), sig,
       source_position_table);
-  builder.SetRuntimeExceptionSupport(runtime_exception_support);
+  builder.set_runtime_exception_support(runtime_exception_support);
 
   DecodeResult result =
       BuildTFGraph(zone->allocator(), &builder, sig, start, end);
@@ -420,10 +420,10 @@ void WasmFunctionCompiler::Build(const byte* start, const byte* end) {
   }
 }
 
-WasmFunctionCompiler::WasmFunctionCompiler(Zone* zone, FunctionSig* sig,
-                                           TestingModuleBuilder* builder,
+WasmFunctionCompiler::WasmFunctionCompiler(
+    Zone* zone, FunctionSig* sig, TestingModuleBuilder* builder,
     const char* name,
-                                           bool runtime_exception_support)
+    compiler::RuntimeExceptionSupport runtime_exception_support)
     : GraphAndBuilders(zone),
       jsgraph(builder->isolate(), this->graph(), this->common(), nullptr,
               nullptr, this->machine()),

test/cctest/wasm/wasm-run-utils.h

@@ -210,11 +210,11 @@ class TestingModuleBuilder {
   Handle<WasmInstanceObject> InitInstanceObject();
 };
 
-void TestBuildingGraph(Zone* zone, compiler::JSGraph* jsgraph,
-                       compiler::ModuleEnv* module, FunctionSig* sig,
-                       compiler::SourcePositionTable* source_position_table,
+void TestBuildingGraph(
+    Zone* zone, compiler::JSGraph* jsgraph, compiler::ModuleEnv* module,
+    FunctionSig* sig, compiler::SourcePositionTable* source_position_table,
     const byte* start, const byte* end,
-                       bool runtime_exception_support = false);
+    compiler::RuntimeExceptionSupport runtime_exception_support);
 
 class WasmFunctionWrapper : private compiler::GraphAndBuilders {
  public:
@@ -275,9 +275,8 @@ class WasmFunctionCompiler : public compiler::GraphAndBuilders {
  private:
   friend class WasmRunnerBase;
 
-  WasmFunctionCompiler(Zone* zone, FunctionSig* sig,
-                       TestingModuleBuilder* builder, const char* name,
-                       bool runtime_exception_support);
+  WasmFunctionCompiler(Zone*, FunctionSig*, TestingModuleBuilder*,
+                       const char* name, compiler::RuntimeExceptionSupport);
 
   Handle<Code> Compile();
 
@@ -290,7 +289,8 @@ class WasmFunctionCompiler : public compiler::GraphAndBuilders {
   LocalDeclEncoder local_decls;
   compiler::SourcePositionTable source_position_table_;
   WasmInterpreter* interpreter_;
-  bool runtime_exception_support_ = false;
+  compiler::RuntimeExceptionSupport runtime_exception_support_ =
+      compiler::kNoRuntimeExceptionSupport;
 };
 
 // A helper class to build a module around Wasm bytecode, generate machine
@@ -298,7 +298,7 @@ class WasmFunctionCompiler : public compiler::GraphAndBuilders {
 class WasmRunnerBase : public HandleAndZoneScope {
  public:
   WasmRunnerBase(WasmExecutionMode execution_mode, int num_params,
-                 bool runtime_exception_support)
+                 compiler::RuntimeExceptionSupport runtime_exception_support)
       : zone_(&allocator_, ZONE_NAME),
         builder_(&zone_, execution_mode),
         wrapper_(&zone_, num_params),
@@ -367,7 +367,8 @@ class WasmRunnerBase : public HandleAndZoneScope {
   WasmFunctionWrapper wrapper_;
   bool compiled_ = false;
   bool possible_nondeterminism_ = false;
-  bool runtime_exception_support_ = false;
+  compiler::RuntimeExceptionSupport runtime_exception_support_ =
+      compiler::kNoRuntimeExceptionSupport;
 
  public:
   // This field has to be static. Otherwise, gcc complains about the use in
@@ -380,7 +381,8 @@ class WasmRunner : public WasmRunnerBase {
  public:
   WasmRunner(WasmExecutionMode execution_mode,
              const char* main_fn_name = "main",
-             bool runtime_exception_support = false)
+             compiler::RuntimeExceptionSupport runtime_exception_support =
+                 compiler::kNoRuntimeExceptionSupport)
       : WasmRunnerBase(execution_mode, sizeof...(ParamTypes),
                        runtime_exception_support) {
     NewFunction<ReturnType, ParamTypes...>(main_fn_name);