Add a level of indirection to exception handler addresses.

src/x64/code-stubs-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3330 matching lines @@
   __ testb(scratch, Immediate(kIsSymbolMask));
   __ j(zero, label);
 }
 
 
 void StackCheckStub::Generate(MacroAssembler* masm) {
   __ TailCallRuntime(Runtime::kStackGuard, 0, 1);
 }
 
 
-void CallFunctionStub::FinishCode(Code* code) {
+void CallFunctionStub::FinishCode(Handle<Code> code) {
   code->set_has_function_cache(false);
 }
 
 
 void CallFunctionStub::Clear(Heap* heap, Address address) {
   UNREACHABLE();
 }
 
 
 Object* CallFunctionStub::GetCachedValue(Address address) {
@@ skipping 335 matching lines @@
 
   __ bind(&throw_termination_exception);
   GenerateThrowUncatchable(masm, TERMINATION);
 
   __ bind(&throw_normal_exception);
   GenerateThrowTOS(masm);
 }
 
 
 void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
-  Label invoke, exit;
+  Label invoke, handler_entry, exit;
   Label not_outermost_js, not_outermost_js_2;
   {  // NOLINT. Scope block confuses linter.
     MacroAssembler::NoRootArrayScope uninitialized_root_register(masm);
     // Setup frame.
     __ push(rbp);
     __ movq(rbp, rsp);
 
     // Push the stack frame type marker twice.
     int marker = is_construct ? StackFrame::ENTRY_CONSTRUCT : StackFrame::ENTRY;
     // Scratch register is neither callee-save, nor an argument register on any
@@ skipping 39 matching lines @@
   __ j(not_zero, &not_outermost_js);
   __ Push(Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME));
   __ movq(rax, rbp);
   __ Store(js_entry_sp, rax);
   Label cont;
   __ jmp(&cont);
   __ bind(&not_outermost_js);
   __ Push(Smi::FromInt(StackFrame::INNER_JSENTRY_FRAME));
   __ bind(&cont);
 
-  // Call a faked try-block that does the invoke.
-  __ call(&invoke);
-
-  // Caught exception: Store result (exception) in the pending
-  // exception field in the JSEnv and return a failure sentinel.
+  // Jump to a faked try block that does the invoke, with a faked catch
+  // block that sets the pending exception.
+  __ jmp(&invoke);
+  __ bind(&handler_entry);
+  handler_offset_ = handler_entry.pos();
+  // Caught exception: Store result (exception) in the pending exception
+  // field in the JSEnv and return a failure sentinel.
   ExternalReference pending_exception(Isolate::kPendingExceptionAddress,
                                       isolate);
   __ Store(pending_exception, rax);
   __ movq(rax, Failure::Exception(), RelocInfo::NONE);
   __ jmp(&exit);
 
-  // Invoke: Link this frame into the handler chain.
+  // Invoke: Link this frame into the handler chain.  There's only one
+  // handler block in this code object, so its index is 0.
   __ bind(&invoke);
-  __ PushTryHandler(IN_JS_ENTRY, JS_ENTRY_HANDLER);
+  __ PushTryHandler(IN_JS_ENTRY, JS_ENTRY_HANDLER, 0);
 
   // Clear any pending exceptions.
   __ LoadRoot(rax, Heap::kTheHoleValueRootIndex);
   __ Store(pending_exception, rax);
 
   // Fake a receiver (NULL).
   __ push(Immediate(0));  // receiver
 
-  // Invoke the function by calling through JS entry trampoline
-  // builtin and pop the faked function when we return. We load the address
-  // from an external reference instead of inlining the call target address
-  // directly in the code, because the builtin stubs may not have been
-  // generated yet at the time this code is generated.
+  // Invoke the function by calling through JS entry trampoline builtin and
+  // pop the faked function when we return. We load the address from an
+  // external reference instead of inlining the call target address directly
+  // in the code, because the builtin stubs may not have been generated yet
+  // at the time this code is generated.
   if (is_construct) {
     ExternalReference construct_entry(Builtins::kJSConstructEntryTrampoline,
                                       isolate);
     __ Load(rax, construct_entry);
   } else {
     ExternalReference entry(Builtins::kJSEntryTrampoline, isolate);
     __ Load(rax, entry);
   }
   __ lea(kScratchRegister, FieldOperand(rax, Code::kHeaderSize));
   __ call(kScratchRegister);
@@ skipping 2226 matching lines @@
     __ bind(&element_done);
     __ ret(0);
   }
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64