[wasm] Initial signal handler

src/runtime/runtime-wasm.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/assembler.h"
 #include "src/compiler/wasm-compiler.h"
 #include "src/conversions.h"
 #include "src/debug/debug.h"
 #include "src/factory.h"
 #include "src/frames-inl.h"
 #include "src/objects-inl.h"
+#include "src/trap-handler/trap-handler.h"
 #include "src/v8memory.h"
 #include "src/wasm/wasm-module.h"
 #include "src/wasm/wasm-objects.h"
 #include "src/wasm/wasm-opcodes.h"
 
 namespace v8 {
 namespace internal {
 
 namespace {
 Handle<WasmInstanceObject> GetWasmInstanceOnStackTop(Isolate* isolate) {
@@ skipping 120 matching lines @@
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   Object* exception = args[0];
   // The unwinder will only deliver exceptions to wasm if the exception is a
   // Number or a Smi (which we have just converted to a Number.) This logic
   // lives in Isolate::is_catchable_by_wasm(Object*).
   CHECK(exception->IsNumber());
   return exception;
 }
 
+RUNTIME_FUNCTION(Runtime_SetThreadInWasm) {
+  DCHECK(!trap_handler::IsThreadInWasm());
+  trap_handler::SetThreadInWasm();
+  return isolate->heap()->undefined_value();
+}
+
+RUNTIME_FUNCTION(Runtime_ClearThreadInWasm) {
+  DCHECK(trap_handler::IsThreadInWasm());
+  trap_handler::ClearThreadInWasm();
+  return isolate->heap()->undefined_value();
+}
+
 }  // namespace internal
 }  // namespace v8