PPC/s390: [cleanup] combine 3 ResumeGenerator stubs into one

src/s390/macro-assembler-s390.cc

 // Copyright 2014 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 <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_S390
 
 #include "src/base/bits.h"
@@ skipping 2383 matching lines @@
     STATIC_ASSERT(kSmiTag == 0);
     TestIfSmi(object);
     Check(ne, kOperandIsASmiAndNotABoundFunction, cr0);
     push(object);
     CompareObjectType(object, object, object, JS_BOUND_FUNCTION_TYPE);
     pop(object);
     Check(eq, kOperandIsNotABoundFunction);
   }
 }
 
-void MacroAssembler::AssertGeneratorObject(Register object) {
-  if (emit_debug_code()) {
-    STATIC_ASSERT(kSmiTag == 0);
-    TestIfSmi(object);
-    Check(ne, kOperandIsASmiAndNotAGeneratorObject, cr0);
-    push(object);
-    CompareObjectType(object, object, object, JS_GENERATOR_OBJECT_TYPE);
-    pop(object);
-    Check(eq, kOperandIsNotAGeneratorObject);
-  }
-}
+void MacroAssembler::AssertGeneratorObject(Register object, Register flags) {
+  // `flags` should be an untagged integer. See `SuspendFlags` in src/globals.h
+  if (!emit_debug_code()) return;
+  TestIfSmi(object);
+  Check(ne, kOperandIsASmiAndNotAGeneratorObject, cr0);
 
-void MacroAssembler::AssertAsyncGeneratorObject(Register object) {
-  if (emit_debug_code()) {
-    STATIC_ASSERT(kSmiTag == 0);
-    TestIfSmi(object);
-    Check(ne, kOperandIsASmiAndNotAGeneratorObject);
-    push(object);
-    CompareObjectType(object, object, object, JS_ASYNC_GENERATOR_OBJECT_TYPE);
-    pop(object);
-    Check(eq, kOperandIsNotAGeneratorObject);
-  }
+  // Load map
+  Register map = object;
+  push(object);
+  LoadP(map, FieldMemOperand(object, HeapObject::kMapOffset));
+
+  Label async, do_check;
+  And(ip, flags, Operand(static_cast<int>(SuspendFlags::kGeneratorTypeMask)));
+  CmpP(ip, Operand(static_cast<int>(SuspendFlags::kGeneratorTypeMask)));
+  bne(&async);
+
+  // Check if JSGeneratorObject
+  CompareInstanceType(map, object, JS_GENERATOR_OBJECT_TYPE);
+  b(&do_check);
+
+  bind(&async);
+  // Check if JSAsyncGeneratorObject
+  CompareInstanceType(map, object, JS_ASYNC_GENERATOR_OBJECT_TYPE);
+
+  bind(&do_check);
+  // Restore generator object to register and perform assertion
+  pop(object);
+  Check(eq, kOperandIsNotAGeneratorObject);
 }
 
 void MacroAssembler::AssertUndefinedOrAllocationSite(Register object,
                                                      Register scratch) {
   if (emit_debug_code()) {
     Label done_checking;
     AssertNotSmi(object);
     CompareRoot(object, Heap::kUndefinedValueRootIndex);
     beq(&done_checking, Label::kNear);
     LoadP(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
@@ skipping 2936 matching lines @@
   }
   if (mag.shift > 0) ShiftRightArith(result, result, Operand(mag.shift));
   ExtractBit(r0, dividend, 31);
   AddP(result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390