MIPS: [turbofan] Implement throwing exceptions into TurboFan code.

src/mips/code-stubs-mips.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_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 5018 matching lines @@
     FrameScope frame(masm, StackFrame::MANUAL);
     __ PushSafepointRegisters();
     __ PrepareCallCFunction(1, a0);
     __ li(a0, 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.
   __ lw(v0, return_value_operand);
   __ bind(&return_value_loaded);
 
   // No more valid handles (the result handle was the last one). Restore
   // previous handle scope.
   __ sw(s0, MemOperand(s3, kNextOffset));
   if (__ emit_debug_code()) {
     __ lw(a1, MemOperand(s3, kLevelOffset));
     __ Check(eq, kUnexpectedLevelAfterReturnFromApiCall, a1, Operand(s2));
   }
   __ Subu(s2, s2, Operand(1));
   __ sw(s2, MemOperand(s3, kLevelOffset));
   __ lw(at, MemOperand(s3, kLimitOffset));
   __ Branch(&delete_allocated_handles, ne, s1, Operand(at));
 
-  // Check if the function scheduled an exception.
+  // Leave the API exit frame.
   __ bind(&leave_exit_frame);
-  __ LoadRoot(t0, Heap::kTheHoleValueRootIndex);
-  __ li(at, Operand(ExternalReference::scheduled_exception_address(isolate)));
-  __ lw(t1, MemOperand(at));
-  __ Branch(&promote_scheduled_exception, ne, t0, Operand(t1));
-  __ bind(&exception_handled);
 
   bool restore_context = context_restore_operand != NULL;
   if (restore_context) {
     __ lw(cp, *context_restore_operand);
   }
   if (stack_space_offset != kInvalidStackOffset) {
     // ExitFrame contains four MIPS argument slots after DirectCEntryStub call
     // so this must be accounted for.
     __ lw(s0, MemOperand(sp, stack_space_offset + kCArgsSlotsSize));
   } else {
     __ li(s0, Operand(stack_space));
   }
-  __ LeaveExitFrame(false, s0, !restore_context, EMIT_RETURN,
+  __ LeaveExitFrame(false, s0, !restore_context, NO_EMIT_RETURN,
                     stack_space_offset != kInvalidStackOffset);
 
+  // Check if the function scheduled an exception.
+  __ LoadRoot(t0, Heap::kTheHoleValueRootIndex);
+  __ li(at, Operand(ExternalReference::scheduled_exception_address(isolate)));
+  __ lw(t1, MemOperand(at));
+  __ Branch(&promote_scheduled_exception, ne, t0, Operand(t1));
+
+  __ Ret();
+
+  // 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);
   __ sw(s1, MemOperand(s3, kLimitOffset));
   __ mov(s0, v0);
   __ mov(a0, v0);
   __ PrepareCallCFunction(1, s1);
   __ li(a0, Operand(ExternalReference::isolate_address(isolate)));
   __ CallCFunction(ExternalReference::delete_handle_scope_extensions(isolate),
                    1);
@@ skipping 167 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS