[wasm] Initial signal handler

src/compiler/wasm-compiler.cc

Index: src/compiler/wasm-compiler.cc
diff --git a/src/compiler/wasm-compiler.cc b/src/compiler/wasm-compiler.cc
index bd039d3f9504b9b22ad7ea5437540f5c36c8c921..f346fc78fb893fd8311e93c7147df93ffe12c451 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -2777,6 +2777,12 @@ void WasmGraphBuilder::BuildJSToWasmWrapper(Handle<Code> wasm_code,
     }
   }
 
+  // Set the ThreadInWasm flag before we do the actual call.
+  Node* parameters[] = {};
+  BuildCallToRuntime(Runtime::kSetThreadInWasm, jsgraph(),
+                     jsgraph()->isolate()->native_context(), parameters, 0,
+                     effect_, *control_);
+
   args[pos++] = *effect_;
   args[pos++] = *control_;
 
@@ -2788,6 +2794,12 @@ void WasmGraphBuilder::BuildJSToWasmWrapper(Handle<Code> wasm_code,
   }
   Node* call = graph()->NewNode(jsgraph()->common()->Call(desc), count, args);
   *effect_ = call;
+
+  // Clear the ThreadInWasmFlag
+  BuildCallToRuntime(Runtime::kClearThreadInWasm, jsgraph(),
+                     jsgraph()->isolate()->native_context(), parameters, 0,
+                     effect_, *control_);
+
   Node* retval = call;
   if (jsgraph()->machine()->Is32() && sig->return_count() > 0 &&
       sig->GetReturn(0) == wasm::kWasmI64) {
@@ -2839,6 +2851,11 @@ void WasmGraphBuilder::BuildWasmToJSWrapper(Handle<JSReceiver> target,
   Node* call;
   bool direct_call = false;
 
+  Node* parameters[] = {};
+  BuildCallToRuntime(Runtime::kClearThreadInWasm, jsgraph(),
+                     jsgraph()->isolate()->native_context(), parameters, 0,
+                     effect_, *control_);
+
   if (target->IsJSFunction()) {
     Handle<JSFunction> function = Handle<JSFunction>::cast(target);
     if (function->shared()->internal_formal_parameter_count() == wasm_count) {
@@ -2903,6 +2920,10 @@ void WasmGraphBuilder::BuildWasmToJSWrapper(Handle<JSReceiver> target,
   *effect_ = call;
   SetSourcePosition(call, 0);
 
+  BuildCallToRuntime(Runtime::kSetThreadInWasm, jsgraph(),
+                     jsgraph()->isolate()->native_context(), parameters, 0,
+                     effect_, *control_);
+
   // Convert the return value back.
   Node* i32_zero = jsgraph()->Int32Constant(0);
   Node* val = sig->return_count() == 0