Keep track of stack base whenever Dart code is invoked.

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/base_isolate.h"
@@ skipping 222 matching lines @@
   }
 
   Dart_LibraryTagHandler library_tag_handler() const {
     return library_tag_handler_;
   }
   void set_library_tag_handler(Dart_LibraryTagHandler value) {
     library_tag_handler_ = value;
   }
 
   void SetStackLimit(uword value);
-  void SetStackLimitFromCurrentTOS(uword isolate_stack_top);
+  void SetStackLimitFromStackBase(uword stack_base);
+  void ClearStackLimit();
 
   uword stack_limit_address() const {
     return reinterpret_cast<uword>(&stack_limit_);
   }
 
   // The current stack limit.  This may be overwritten with a special
   // value to trigger interrupts.
   uword stack_limit() const { return stack_limit_; }
   static intptr_t stack_limit_offset() {
     return OFFSET_OF(Isolate, stack_limit_);
   }
 
   // The true stack limit for this isolate.
   uword saved_stack_limit() const { return saved_stack_limit_; }
 
+  uword stack_base() const { return stack_base_; }
+
   // Stack overflow flags
   enum {
     kOsrRequest = 0x1,  // Current stack overflow caused by OSR request.
   };
 
   uword stack_overflow_flags_address() const {
     return reinterpret_cast<uword>(&stack_overflow_flags_);
   }
 
   int32_t IncrementAndGetStackOverflowCount() {
     return ++stack_overflow_count_;
   }
 
   // Retrieves and clears the stack overflow flags.  These are set by
   // the generated code before the slow path runtime routine for a
   // stack overflow is called.
   uword GetAndClearStackOverflowFlags();
 
-  // Retrieve the stack address bounds.
-  bool GetStackBounds(uword* lower, uword* upper);
+  // Retrieve the stack address bounds for profiler.
+  bool GetProfilerStackBounds(uword* lower, uword* upper) const;
 
   static uword GetSpecifiedStackSize();
 
   static const intptr_t kStackSizeBuffer = (4 * KB * kWordSize);
 
   // Interrupt bits.
   enum {
     kApiInterrupt = 0x1,      // An interrupt from Dart_InterruptIsolate.
     kMessageInterrupt = 0x2,  // An interrupt to process an out of band message.
     kStoreBufferInterrupt = 0x4,  // An interrupt to process the store buffer.
@@ skipping 353 matching lines @@
   bool single_step_;
   bool resume_request_;
   Random random_;
   Simulator* simulator_;
   LongJumpScope* long_jump_base_;
   TimerList timer_list_;
   intptr_t deopt_id_;
   Mutex* mutex_;  // protects stack_limit_ and saved_stack_limit_.
   uword stack_limit_;
   uword saved_stack_limit_;
+  uword stack_base_;
   uword stack_overflow_flags_;
   int32_t stack_overflow_count_;
   MessageHandler* message_handler_;
   IsolateSpawnState* spawn_state_;
   bool is_runnable_;
   Dart_GcPrologueCallback gc_prologue_callback_;
   Dart_GcEpilogueCallback gc_epilogue_callback_;
   intptr_t defer_finalization_count_;
   DeoptContext* deopt_context_;
 
@@ skipping 80 matching lines @@
 // When we need to execute code in an isolate, we use the
 // StartIsolateScope.
 class StartIsolateScope {
  public:
   explicit StartIsolateScope(Isolate* new_isolate)
       : new_isolate_(new_isolate), saved_isolate_(Isolate::Current()) {
     ASSERT(new_isolate_ != NULL);
     if (saved_isolate_ != new_isolate_) {
       ASSERT(Isolate::Current() == NULL);
       Isolate::SetCurrent(new_isolate_);
-      new_isolate_->SetStackLimitFromCurrentTOS(reinterpret_cast<uword>(this));
+      new_isolate_->SetStackLimitFromStackBase(reinterpret_cast<uword>(this));
     }
   }
 
   ~StartIsolateScope() {
     if (saved_isolate_ != new_isolate_) {
-      new_isolate_->SetStackLimit(~static_cast<uword>(0));
+      new_isolate_->ClearStackLimit();
       Isolate::SetCurrent(saved_isolate_);
     }
   }
 
  private:
   Isolate* new_isolate_;
   Isolate* saved_isolate_;
 
   DISALLOW_COPY_AND_ASSIGN(StartIsolateScope);
 };
@@ skipping 72 matching lines @@
   char* exception_callback_name_;
   uint8_t* serialized_args_;
   intptr_t serialized_args_len_;
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_