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

src/mips/builtins-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.
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 822 matching lines @@
   //  -- a2 : the resume mode (tagged)
   //  -- ra : return address
   // -----------------------------------
   __ AssertGeneratorObject(a1);
 
   // Store input value into generator object.
   __ sw(v0, FieldMemOperand(a1, JSGeneratorObject::kInputOffset));
   __ RecordWriteField(a1, JSGeneratorObject::kInputOffset, v0, a3,
                       kRAHasNotBeenSaved, kDontSaveFPRegs);
 
+  // Store resume mode into generator object.
+  __ sw(a2, FieldMemOperand(a1, JSGeneratorObject::kResumeModeOffset));
+
   // Load suspended function and context.
   __ lw(cp, FieldMemOperand(a1, JSGeneratorObject::kContextOffset));
   __ lw(t0, FieldMemOperand(a1, JSGeneratorObject::kFunctionOffset));
 
   // Flood function if we are stepping.
   Label skip_flooding;
   ExternalReference step_in_enabled =
       ExternalReference::debug_step_in_enabled_address(masm->isolate());
   __ li(t1, Operand(step_in_enabled));
   __ lb(t1, MemOperand(t1));
@@ skipping 53 matching lines @@
     Label done_loop, loop;
     __ bind(&loop);
     __ Branch(&done_loop, eq, a0, Operand(a3));
     __ lw(t1, MemOperand(a0));
     __ Push(t1);
     __ Branch(USE_DELAY_SLOT, &loop);
     __ addiu(a0, a0, kPointerSize);  // In delay slot.
     __ bind(&done_loop);
   }
 
-  // Push resume mode (consumed in continuation).
-  __ Push(a2);
-
   // Reset operand stack so we don't leak.
   __ LoadRoot(t1, Heap::kEmptyFixedArrayRootIndex);
   __ sw(t1, FieldMemOperand(a1, JSGeneratorObject::kOperandStackOffset));
 
-  // Restore value.
-  __ lw(v0, FieldMemOperand(a1, JSGeneratorObject::kInputOffset));
-
   // Resume the generator function at the continuation.
   __ lw(a3, FieldMemOperand(t0, JSFunction::kSharedFunctionInfoOffset));
   __ lw(a3, FieldMemOperand(a3, SharedFunctionInfo::kCodeOffset));
   __ Addu(a3, a3, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ lw(a2, FieldMemOperand(a1, JSGeneratorObject::kContinuationOffset));
   __ SmiUntag(a2);
   __ Addu(a3, a3, Operand(a2));
   __ li(a2, Operand(Smi::FromInt(JSGeneratorObject::kGeneratorExecuting)));
   __ sw(a2, FieldMemOperand(a1, JSGeneratorObject::kContinuationOffset));
+  __ Move(v0, a1);  // Continuation expects generator object in v0.
   __ Jump(a3);
 }
 
 // Generate code for entering a JS function with the interpreter.
 // On entry to the function the receiver and arguments have been pushed on the
 // stack left to right.  The actual argument count matches the formal parameter
 // count expected by the function.
 //
 // The live registers are:
 //   o a1: the JS function object being called.
@@ skipping 1765 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS