Migrate most uses of StackZone(Isolate*) to Thread*.

runtime/vm/code_generator.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
@@ skipping 1662 matching lines @@
     saved_registers_address += kWordSize;
   }
   *cpu_registers = cpu_registers_copy;
 }
 
 
 // Copies saved registers and caller's frame into temporary buffers.
 // Returns the stack size of unoptimized frame.
 DEFINE_LEAF_RUNTIME_ENTRY(intptr_t, DeoptimizeCopyFrame,
                           1, uword saved_registers_address) {
-  Isolate* isolate = Isolate::Current();
-  StackZone zone(isolate);
-  HANDLESCOPE(isolate);
+  Thread* thread = Thread::Current();
+  Isolate* isolate = thread->isolate();
+  StackZone zone(thread);
+  HANDLESCOPE(thread);
 
   // All registers have been saved below last-fp as if they were locals.
   const uword last_fp = saved_registers_address
                         + (kNumberOfCpuRegisters * kWordSize)
                         + (kNumberOfFpuRegisters * kFpuRegisterSize)
                         - ((kFirstLocalSlotFromFp + 1) * kWordSize);
 
   // Get optimized code and frame that need to be deoptimized.
   DartFrameIterator iterator(last_fp);
   StackFrame* caller_frame = iterator.NextFrame();
@@ skipping 15 matching lines @@
 
   // Stack size (FP - SP) in bytes.
   return deopt_context->DestStackAdjustment() * kWordSize;
 }
 END_LEAF_RUNTIME_ENTRY
 
 
 // The stack has been adjusted to fit all values for unoptimized frame.
 // Fill the unoptimized frame.
 DEFINE_LEAF_RUNTIME_ENTRY(void, DeoptimizeFillFrame, 1, uword last_fp) {
-  Isolate* isolate = Isolate::Current();
-  StackZone zone(isolate);
-  HANDLESCOPE(isolate);
+  Thread* thread = Thread::Current();
+  Isolate* isolate = thread->isolate();
+  StackZone zone(thread);
+  HANDLESCOPE(thread);
 
   DeoptContext* deopt_context = isolate->deopt_context();
   DartFrameIterator iterator(last_fp);
   StackFrame* caller_frame = iterator.NextFrame();
   ASSERT(caller_frame != NULL);
 
 #if defined(DEBUG)
   {
     // The code from the deopt_context.
     const Code& code = Code::Handle(deopt_context->code());
@@ skipping 36 matching lines @@
   // from the stack.
   arguments.SetReturn(Smi::Handle(Smi::New(deopt_arg_count * kWordSize)));
 }
 
 
 DEFINE_LEAF_RUNTIME_ENTRY(intptr_t,
                           BigintCompare,
                           2,
                           RawBigint* left,
                           RawBigint* right) {
-  Isolate* isolate = Isolate::Current();
-  StackZone zone(isolate);
-  HANDLESCOPE(isolate);
+  Thread* thread = Thread::Current();
+  StackZone zone(thread);
+  HANDLESCOPE(thread);
   const Bigint& big_left = Bigint::Handle(left);
   const Bigint& big_right = Bigint::Handle(right);
   return big_left.CompareWith(big_right);
 }
 END_LEAF_RUNTIME_ENTRY
 
 
 double DartModulo(double left, double right) {
   double remainder = fmod_ieee(left, right);
   if (remainder == 0.0) {
@@ skipping 46 matching lines @@
   const intptr_t elm_size = old_data.ElementSizeInBytes();
   const TypedData& new_data =
       TypedData::Handle(TypedData::New(cid, new_size, Heap::kOld));
   TypedData::Copy(new_data, 0, old_data, 0, old_size * elm_size);
   typed_data_cell.SetAt(0, new_data);
   arguments.SetReturn(new_data);
 }
 
 
 }  // namespace dart