[wasm] Store compile errors in CompilationState

We are currently storing compilation errors in the individual
compilation units and pass it to the ErrorThrower during finishing.
This CL changes that to store errors on the CompilationState directly.
From there, it is propagated to the ErrorThrower in the compilation
state callback.
This removes more work from the finisher task and slims down the
WasmCompilationUnits.

R=mstarzinger@chromium.org

Bug: v8:8343, v8:7921
Change-Id: Id332add43d4219d2a30fee653ed4e53a9b2698d9
Reviewed-on: https://chromium-review.googlesource.com/c/1303720Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57091}

src/compiler/wasm-compiler.cc

@@ -5200,19 +5200,18 @@ TurbofanWasmCompilationUnit::TurbofanWasmCompilationUnit(
 // Clears unique_ptrs, but (part of) the type is forward declared in the header.
 TurbofanWasmCompilationUnit::~TurbofanWasmCompilationUnit() = default;
 
-SourcePositionTable* TurbofanWasmCompilationUnit::BuildGraphForWasmFunction(
+bool TurbofanWasmCompilationUnit::BuildGraphForWasmFunction(
     wasm::CompilationEnv* env, wasm::WasmFeatures* detected, double* decode_ms,
-    MachineGraph* mcgraph, NodeOriginTable* node_origins) {
+    MachineGraph* mcgraph, NodeOriginTable* node_origins,
+    SourcePositionTable* source_positions) {
   base::ElapsedTimer decode_timer;
   if (FLAG_trace_wasm_decode_time) {
     decode_timer.Start();
   }
 
   // Create a TF graph during decoding.
-  SourcePositionTable* source_position_table =
-      new (mcgraph->zone()) SourcePositionTable(mcgraph->graph());
   WasmGraphBuilder builder(env, mcgraph->zone(), mcgraph,
-                           wasm_unit_->func_body_.sig, source_position_table);
+                           wasm_unit_->func_body_.sig, source_positions);
   wasm::VoidResult graph_construction_result = wasm::BuildTFGraph(
       wasm_unit_->wasm_engine_->allocator(),
       wasm_unit_->native_module_->enabled_features(), env->module, &builder,
@@ -5222,9 +5221,9 @@ SourcePositionTable* TurbofanWasmCompilationUnit::BuildGraphForWasmFunction(
       StdoutStream{} << "Compilation failed: "
                      << graph_construction_result.error_msg() << std::endl;
     }
-    wasm_unit_->result_ = wasm::Result<wasm::WasmCode*>::ErrorFrom(
-        std::move(graph_construction_result));
-    return nullptr;
+    wasm_unit_->native_module()->compilation_state()->SetError(
+        wasm_unit_->func_index_, std::move(graph_construction_result));
+    return false;
   }
 
   builder.LowerInt64();
@@ -5245,7 +5244,7 @@ SourcePositionTable* TurbofanWasmCompilationUnit::BuildGraphForWasmFunction(
   if (FLAG_trace_wasm_decode_time) {
     *decode_ms = decode_timer.Elapsed().InMillisecondsF();
   }
-  return source_position_table;
+  return true;
 }
 
 namespace {
@@ -5294,10 +5293,13 @@ void TurbofanWasmCompilationUnit::ExecuteCompilation(
                                       ? new (&zone)
                                             NodeOriginTable(mcgraph->graph())
                                       : nullptr;
-  SourcePositionTable* source_positions = BuildGraphForWasmFunction(
-      env, detected, &decode_ms, mcgraph, node_origins);
-
-  if (wasm_unit_->failed()) return;
+  SourcePositionTable* source_positions =
+      new (mcgraph->zone()) SourcePositionTable(mcgraph->graph());
+  if (!BuildGraphForWasmFunction(env, detected, &decode_ms, mcgraph,
+                                 node_origins, source_positions)) {
+    // Compilation failed.
+    return;
+  }
 
   if (node_origins) {
     node_origins->AddDecorator();

src/compiler/wasm-compiler.h

@@ -50,11 +50,11 @@ class TurbofanWasmCompilationUnit {
   explicit TurbofanWasmCompilationUnit(wasm::WasmCompilationUnit* wasm_unit);
   ~TurbofanWasmCompilationUnit();
 
-  SourcePositionTable* BuildGraphForWasmFunction(wasm::CompilationEnv* env,
+  bool BuildGraphForWasmFunction(wasm::CompilationEnv* env,
                                  wasm::WasmFeatures* detected,
-                                                 double* decode_ms,
-                                                 MachineGraph* mcgraph,
-                                                 NodeOriginTable* node_origins);
+                                 double* decode_ms, MachineGraph* mcgraph,
+                                 NodeOriginTable* node_origins,
+                                 SourcePositionTable* source_positions);
 
   void ExecuteCompilation(wasm::CompilationEnv*, Counters*,
                           wasm::WasmFeatures* detected);

src/wasm/compilation-environment.h

@@ -13,6 +13,7 @@ namespace internal {
 namespace wasm {
 
 class NativeModule;
+class ResultBase;
 
 enum RuntimeExceptionSupport : bool {
   kRuntimeExceptionSupport = true,
@@ -71,6 +72,8 @@ class CompilationState {
 
   void CancelAndWait();
 
+  void SetError(uint32_t func_index, const ResultBase& error_result);
+
  private:
   friend class NativeModule;
   CompilationState() = delete;

src/wasm/function-compiler.cc

@@ -93,25 +93,6 @@ void WasmCompilationUnit::ExecuteCompilation(CompilationEnv* env,
   }
 }
 
-void WasmCompilationUnit::ReportError(ErrorThrower* thrower) const {
-  DCHECK(result_.failed());
-  // Add the function as another context for the exception. This is
-  // user-visible, so use official format.
-  EmbeddedVector<char, 128> message;
-  wasm::ModuleWireBytes wire_bytes(native_module()->wire_bytes());
-  wasm::WireBytesRef name_ref =
-      native_module()->module()->LookupFunctionName(wire_bytes, func_index_);
-  if (name_ref.is_set()) {
-    wasm::WasmName name = wire_bytes.GetNameOrNull(name_ref);
-    SNPrintF(message, "Compiling wasm function \"%.*s\" failed", name.length(),
-             name.start());
-  } else {
-    SNPrintF(message, "Compiling wasm function \"wasm-function[%d]\" failed",
-             func_index_);
-  }
-  thrower->CompileFailed(message.start(), result_);
-}
-
 void WasmCompilationUnit::SwitchMode(ExecutionTier new_mode) {
   // This method is being called in the constructor, where neither
   // {liftoff_unit_} nor {turbofan_unit_} are set, or to switch mode from
@@ -135,9 +116,11 @@ void WasmCompilationUnit::SwitchMode(ExecutionTier new_mode) {
 }
 
 // static
-bool WasmCompilationUnit::CompileWasmFunction(
-    Isolate* isolate, NativeModule* native_module, WasmFeatures* detected,
-    ErrorThrower* thrower, const WasmFunction* function, ExecutionTier mode) {
+bool WasmCompilationUnit::CompileWasmFunction(Isolate* isolate,
+                                              NativeModule* native_module,
+                                              WasmFeatures* detected,
+                                              const WasmFunction* function,
+                                              ExecutionTier mode) {
   ModuleWireBytes wire_bytes(native_module->wire_bytes());
   FunctionBody function_body{function->sig, function->code.offset(),
                              wire_bytes.start() + function->code.offset(),
@@ -147,17 +130,12 @@ bool WasmCompilationUnit::CompileWasmFunction(
                            function->func_index, mode);
   CompilationEnv env = native_module->CreateCompilationEnv();
   unit.ExecuteCompilation(&env, isolate->counters(), detected);
-  if (unit.failed()) {
-    unit.ReportError(thrower);
-    return false;
-  }
-  return true;
+  return !unit.failed();
 }
 
 void WasmCompilationUnit::SetResult(WasmCode* code, Counters* counters) {
-  DCHECK(!result_.failed());
-  DCHECK_NULL(result_.value());
-  result_ = Result<WasmCode*>(code);
+  DCHECK_NULL(result_);
+  result_ = code;
   native_module()->PublishCode(code);
 
   counters->wasm_generated_code_size()->Increment(

src/wasm/function-compiler.h

@@ -46,17 +46,11 @@ class WasmCompilationUnit final {
 
   NativeModule* native_module() const { return native_module_; }
   ExecutionTier mode() const { return mode_; }
-  bool failed() const { return result_.failed(); }
-  WasmCode* result() const {
-    DCHECK(!failed());
-    DCHECK_NOT_NULL(result_.value());
-    return result_.value();
-  }
-
-  void ReportError(ErrorThrower* thrower) const;
+  bool failed() const { return result_ == nullptr; }  // TODO(clemensh): Remove.
+  WasmCode* result() const { return result_; }
 
   static bool CompileWasmFunction(Isolate* isolate, NativeModule* native_module,
-                                  WasmFeatures* detected, ErrorThrower* thrower,
+                                  WasmFeatures* detected,
                                   const WasmFunction* function,
                                   ExecutionTier = GetDefaultExecutionTier());
 
@@ -69,7 +63,7 @@ class WasmCompilationUnit final {
   int func_index_;
   NativeModule* native_module_;
   ExecutionTier mode_;
-  wasm::Result<WasmCode*> result_;
+  WasmCode* result_ = nullptr;
 
   // LiftoffCompilationUnit, set if {mode_ == kLiftoff}.
   std::unique_ptr<LiftoffCompilationUnit> liftoff_unit_;

src/wasm/wasm-engine.cc

@@ -173,11 +173,10 @@ std::shared_ptr<StreamingDecoder> WasmEngine::StartStreamingCompilation(
 
 bool WasmEngine::CompileFunction(Isolate* isolate, NativeModule* native_module,
                                  uint32_t function_index, ExecutionTier tier) {
-  ErrorThrower thrower(isolate, "Manually requested tier up");
   // Note we assume that "one-off" compilations can discard detected features.
   WasmFeatures detected = kNoWasmFeatures;
   return WasmCompilationUnit::CompileWasmFunction(
-      isolate, native_module, &detected, &thrower,
+      isolate, native_module, &detected,
       &native_module->module()->functions[function_index], tier);
 }
 

src/wasm/wasm-engine.h

@@ -95,8 +95,8 @@ class V8_EXPORT_PRIVATE WasmEngine {
       std::shared_ptr<CompilationResultResolver> resolver);
 
   // Compiles the function with the given index at a specific compilation tier
-  // and returns true on success, false (and pending exception) otherwise. This
-  // is mostly used for testing to force a function into a specific tier.
+  // and returns true on success, false otherwise. This is mostly used for
+  // testing to force a function into a specific tier.
   bool CompileFunction(Isolate* isolate, NativeModule* native_module,
                        uint32_t function_index, ExecutionTier tier);
 

src/wasm/wasm-result.h

@@ -125,13 +125,17 @@ class V8_EXPORT_PRIVATE ErrorThrower {
   PRINTF_FORMAT(2, 3) void LinkError(const char* fmt, ...);
   PRINTF_FORMAT(2, 3) void RuntimeError(const char* fmt, ...);
 
-  template <typename T>
-  void CompileFailed(const char* error, const Result<T>& result) {
+  void CompileFailed(const char* error, const ResultBase& result) {
     DCHECK(result.failed());
     CompileError("%s: %s @+%u", error, result.error_msg().c_str(),
                  result.error_offset());
   }
 
+  void CompileFailed(const ResultBase& result) {
+    DCHECK(result.failed());
+    CompileError("%s @+%u", result.error_msg().c_str(), result.error_offset());
+  }
+
   // Create and return exception object.
   V8_WARN_UNUSED_RESULT Handle<Object> Reify();
 

test/cctest/wasm/test-wasm-shared-engine.cc

@@ -350,10 +350,9 @@ TEST(SharedEngineRunThreadedTierUp) {
   threads.emplace_back(&engine, [module](SharedEngineIsolate& isolate) {
     HandleScope scope(isolate.isolate());
     Handle<WasmInstanceObject> instance = isolate.ImportInstance(module);
-    ErrorThrower thrower(isolate.isolate(), "Forced Tier Up");
     WasmFeatures detected = kNoWasmFeatures;
     WasmCompilationUnit::CompileWasmFunction(
-        isolate.isolate(), module.get(), &detected, &thrower,
+        isolate.isolate(), module.get(), &detected,
         &module->module()->functions[0], ExecutionTier::kOptimized);
     CHECK_EQ(23, isolate.Run(instance));
   });