[turbofan] Implement throwing exceptions into TurboFan code.

src/arm/code-stubs-arm.cc

 // Copyright 2012 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/v8.h"
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 4795 matching lines @@
     FrameScope frame(masm, StackFrame::MANUAL);
     __ PushSafepointRegisters();
     __ PrepareCallCFunction(1, r0);
     __ mov(r0, Operand(ExternalReference::isolate_address(isolate)));
     __ CallCFunction(ExternalReference::log_leave_external_function(isolate),
                      1);
     __ PopSafepointRegisters();
   }
 
   Label promote_scheduled_exception;
-  Label exception_handled;
   Label delete_allocated_handles;
   Label leave_exit_frame;
   Label return_value_loaded;
 
   // load value from ReturnValue
   __ ldr(r0, return_value_operand);
   __ bind(&return_value_loaded);
   // No more valid handles (the result handle was the last one). Restore
   // previous handle scope.
   __ str(r4, MemOperand(r9, kNextOffset));
   if (__ emit_debug_code()) {
     __ ldr(r1, MemOperand(r9, kLevelOffset));
     __ cmp(r1, r6);
     __ Check(eq, kUnexpectedLevelAfterReturnFromApiCall);
   }
   __ sub(r6, r6, Operand(1));
   __ str(r6, MemOperand(r9, kLevelOffset));
   __ ldr(ip, MemOperand(r9, kLimitOffset));
   __ cmp(r5, ip);
   __ b(ne, &delete_allocated_handles);
 
-  // Check if the function scheduled an exception.
+  // Leave the API exit frame.
   __ bind(&leave_exit_frame);
-  __ LoadRoot(r4, Heap::kTheHoleValueRootIndex);
-  __ mov(ip, Operand(ExternalReference::scheduled_exception_address(isolate)));
-  __ ldr(r5, MemOperand(ip));
-  __ cmp(r4, r5);
-  __ b(ne, &promote_scheduled_exception);
-  __ bind(&exception_handled);
-
   bool restore_context = context_restore_operand != NULL;
   if (restore_context) {
     __ ldr(cp, *context_restore_operand);
   }
   // LeaveExitFrame expects unwind space to be in a register.
   if (stack_space_operand != NULL) {
     __ ldr(r4, *stack_space_operand);
   } else {
     __ mov(r4, Operand(stack_space));
   }
   __ LeaveExitFrame(false, r4, !restore_context, stack_space_operand != NULL);
+
+  // Check if the function scheduled an exception.
+  __ LoadRoot(r4, Heap::kTheHoleValueRootIndex);
+  __ mov(ip, Operand(ExternalReference::scheduled_exception_address(isolate)));
+  __ ldr(r5, MemOperand(ip));
+  __ cmp(r4, r5);
+  __ b(ne, &promote_scheduled_exception);
+
   __ mov(pc, lr);
 
+  // Re-throw by promoting a scheduled exception.
   __ bind(&promote_scheduled_exception);
-  {
-    FrameScope frame(masm, StackFrame::INTERNAL);
-    __ CallExternalReference(
-        ExternalReference(Runtime::kPromoteScheduledException, isolate), 0);
-  }
-  __ jmp(&exception_handled);
+  __ TailCallRuntime(Runtime::kPromoteScheduledException, 0, 1);
 
   // HandleScope limit has changed. Delete allocated extensions.
   __ bind(&delete_allocated_handles);
   __ str(r5, MemOperand(r9, kLimitOffset));
   __ mov(r4, r0);
   __ PrepareCallCFunction(1, r5);
   __ mov(r0, Operand(ExternalReference::isolate_address(isolate)));
   __ CallCFunction(ExternalReference::delete_handle_scope_extensions(isolate),
                    1);
   __ mov(r0, r4);
@@ skipping 177 matching lines @@
                            kStackUnwindSpace, NULL,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM