[generators] Store the resume mode in the generator object.

src/arm/builtins-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.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 701 matching lines @@
   //  -- r2 : the resume mode (tagged)
   //  -- lr : return address
   // -----------------------------------
   __ AssertGeneratorObject(r1);
 
   // Store input value into generator object.
   __ str(r0, FieldMemOperand(r1, JSGeneratorObject::kInputOffset));
   __ RecordWriteField(r1, JSGeneratorObject::kInputOffset, r0, r3,
                       kLRHasNotBeenSaved, kDontSaveFPRegs);
 
+  // Store resume mode into generator object.
+  __ str(r2, FieldMemOperand(r1, JSGeneratorObject::kResumeModeOffset));
+
   // Load suspended function and context.
   __ ldr(cp, FieldMemOperand(r1, JSGeneratorObject::kContextOffset));
   __ ldr(r4, FieldMemOperand(r1, JSGeneratorObject::kFunctionOffset));
 
   // Flood function if we are stepping.
   Label skip_flooding;
   ExternalReference step_in_enabled =
       ExternalReference::debug_step_in_enabled_address(masm->isolate());
   __ mov(ip, Operand(step_in_enabled));
   __ ldrb(ip, MemOperand(ip));
@@ skipping 55 matching lines @@
     Label done_loop, loop;
     __ bind(&loop);
     __ cmp(r0, r3);
     __ b(eq, &done_loop);
     __ ldr(ip, MemOperand(r0, kPointerSize, PostIndex));
     __ Push(ip);
     __ b(&loop);
     __ bind(&done_loop);
   }
 
-  // Push resume mode (consumed in continuation).
-  __ Push(r2);
-
   // Reset operand stack so we don't leak.
   __ LoadRoot(ip, Heap::kEmptyFixedArrayRootIndex);
   __ str(ip, FieldMemOperand(r1, JSGeneratorObject::kOperandStackOffset));
 
-  // Restore value.
-  __ ldr(r0, FieldMemOperand(r1, JSGeneratorObject::kInputOffset));
-
   // Resume the generator function at the continuation.
   __ ldr(r3, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
   __ ldr(r3, FieldMemOperand(r3, SharedFunctionInfo::kCodeOffset));
   __ add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ ldr(r2, FieldMemOperand(r1, JSGeneratorObject::kContinuationOffset));
   __ add(r3, r3, Operand(r2, ASR, 1));
   __ mov(r2, Operand(Smi::FromInt(JSGeneratorObject::kGeneratorExecuting)));
   __ str(r2, FieldMemOperand(r1, JSGeneratorObject::kContinuationOffset));
+  __ Move(r0, r1);  // Continuation expects generator object in r0.
   __ Jump(r3);
 }
 
 void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
   FrameScope scope(masm, StackFrame::INTERNAL);
   __ push(r1);
   __ CallRuntime(Runtime::kThrowConstructedNonConstructable);
 }
 
 
@@ skipping 1797 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM