[arm64] Add assertions to Claim and Drop.

src/arm64/macro-assembler-arm64-inl.h

 // Copyright 2013 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.
 
 #ifndef V8_ARM64_MACRO_ASSEMBLER_ARM64_INL_H_
 #define V8_ARM64_MACRO_ASSEMBLER_ARM64_INL_H_
 
 #include <ctype.h>
 
 #include "src/globals.h"
@@ skipping 1444 matching lines @@
 
 
 void MacroAssembler::Push(Handle<Object> handle) {
   UseScratchRegisterScope temps(this);
   Register tmp = temps.AcquireX();
   Mov(tmp, Operand(handle));
   Push(tmp);
 }
 
 
-void MacroAssembler::Claim(uint64_t count, uint64_t unit_size) {
+void MacroAssembler::Claim(int64_t count, uint64_t unit_size) {
+  DCHECK(count >= 0);
   uint64_t size = count * unit_size;
 
   if (size == 0) {
     return;
   }
 
   if (csp.Is(StackPointer())) {
     DCHECK(size % 16 == 0);
   } else {
     BumpSystemStackPointer(size);
   }
 
   Sub(StackPointer(), StackPointer(), size);
 }
 
 
 void MacroAssembler::Claim(const Register& count, uint64_t unit_size) {
   if (unit_size == 0) return;
   DCHECK(base::bits::IsPowerOfTwo64(unit_size));
 
   const int shift = CountTrailingZeros(unit_size, kXRegSizeInBits);
   const Operand size(count, LSL, shift);
 
   if (size.IsZero()) {
     return;
   }
 
+  AssertPositiveOrZero(count);
   if (!csp.Is(StackPointer())) {
     BumpSystemStackPointer(size);
   }
 
   Sub(StackPointer(), StackPointer(), size);
 }
 
 
 void MacroAssembler::ClaimBySMI(const Register& count_smi, uint64_t unit_size) {
   DCHECK(unit_size == 0 || base::bits::IsPowerOfTwo64(unit_size));
   const int shift = CountTrailingZeros(unit_size, kXRegSizeInBits) - kSmiShift;
   const Operand size(count_smi,
                      (shift >= 0) ? (LSL) : (LSR),
                      (shift >= 0) ? (shift) : (-shift));
 
   if (size.IsZero()) {
     return;
   }
 
   if (!csp.Is(StackPointer())) {
     BumpSystemStackPointer(size);
   }
 
   Sub(StackPointer(), StackPointer(), size);
 }
 
 
-void MacroAssembler::Drop(uint64_t count, uint64_t unit_size) {
+void MacroAssembler::Drop(int64_t count, uint64_t unit_size) {
+  DCHECK(count >= 0);
   uint64_t size = count * unit_size;
 
   if (size == 0) {
     return;
   }
 
   Add(StackPointer(), StackPointer(), size);
 
   if (csp.Is(StackPointer())) {
     DCHECK(size % 16 == 0);
@@ skipping 10 matching lines @@
   if (unit_size == 0) return;
   DCHECK(base::bits::IsPowerOfTwo64(unit_size));
 
   const int shift = CountTrailingZeros(unit_size, kXRegSizeInBits);
   const Operand size(count, LSL, shift);
 
   if (size.IsZero()) {
     return;
   }
 
+  AssertPositiveOrZero(count);
   Add(StackPointer(), StackPointer(), size);
 
   if (!csp.Is(StackPointer()) && emit_debug_code()) {
     // It is safe to leave csp where it is when unwinding the JavaScript stack,
     // but if we keep it matching StackPointer, the simulator can detect memory
     // accesses in the now-free part of the stack.
     SyncSystemStackPointer();
   }
 }
 
@@ skipping 93 matching lines @@
   DCHECK(isprint(marker_name[0]) && isprint(marker_name[1]));
 
   InstructionAccurateScope scope(this, 1);
   movn(xzr, (marker_name[1] << 8) | marker_name[0]);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_INL_H_