Changed StackZone and ApiZone to be containers for Zone.

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2012, 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 "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
@@ skipping 182 matching lines @@
 
 Dart_Handle Api::NewError(const char* format, ...) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE_NOCHECKS(isolate);
 
   va_list args;
   va_start(args, format);
   intptr_t len = OS::VSNPrint(NULL, 0, format, args);
   va_end(args);
 
-  char* buffer = zone.Alloc<char>(len + 1);
+  char* buffer = isolate->current_zone()->Alloc<char>(len + 1);
   va_list args2;
   va_start(args2, format);
   OS::VSNPrint(buffer, (len + 1), format, args2);
   va_end(args2);
 
   const String& message = String::Handle(isolate, String::New(buffer));
   return Api::NewHandle(isolate, ApiError::New(message));
 }
 
 
@@ skipping 189 matching lines @@
 // TODO(turnidge): Remove all uses and delete.
 DART_EXPORT Dart_Handle Dart_Error(const char* format, ...) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
 
   va_list args;
   va_start(args, format);
   intptr_t len = OS::VSNPrint(NULL, 0, format, args);
   va_end(args);
 
-  char* buffer = zone.Alloc<char>(len + 1);
+  char* buffer = isolate->current_zone()->Alloc<char>(len + 1);
   va_list args2;
   va_start(args2, format);
   OS::VSNPrint(buffer, (len + 1), format, args2);
   va_end(args2);
 
   const String& message = String::Handle(isolate, String::New(buffer));
   return Api::NewHandle(isolate, ApiError::New(message));
 }
 
 
 // TODO(turnidge): This clones Api::NewError.  I need to use va_copy to
 // fix this but not sure if it available on all of our builds.
 DART_EXPORT Dart_Handle Dart_NewApiError(const char* format, ...) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
 
   va_list args;
   va_start(args, format);
   intptr_t len = OS::VSNPrint(NULL, 0, format, args);
   va_end(args);
 
-  char* buffer = zone.Alloc<char>(len + 1);
+  char* buffer = isolate->current_zone()->Alloc<char>(len + 1);
   va_list args2;
   va_start(args2, format);
   OS::VSNPrint(buffer, (len + 1), format, args2);
   va_end(args2);
 
   const String& message = String::Handle(isolate, String::New(buffer));
   return Api::NewHandle(isolate, ApiError::New(message));
 }
 
 
 DART_EXPORT Dart_Handle Dart_NewUnhandledExceptionError(Dart_Handle exception) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const Instance& obj = Api::UnwrapInstanceHandle(isolate, exception);
   if (obj.IsNull()) {
     RETURN_TYPE_ERROR(isolate, exception, Instance);
   }
   const Instance& stacktrace = Instance::Handle(isolate);
   return Api::NewHandle(isolate, UnhandledException::New(obj, stacktrace));
 }
 
 
 DART_EXPORT Dart_Handle Dart_PropagateError(Dart_Handle handle) {
   Isolate* isolate = Isolate::Current();
-  CHECK_ISOLATE(isolate);
   const Object& obj = Object::Handle(isolate, Api::UnwrapHandle(handle));
   if (!obj.IsError()) {
     return Api::NewError(
         "%s expects argument 'handle' to be an error handle.  "
         "Did you forget to check Dart_IsError first?",
         CURRENT_FUNC);
   }
   if (isolate->top_exit_frame_info() == 0) {
     // There are no dart frames on the stack so it would be illegal to
     // propagate an error here.
     return Api::NewError("No Dart frames on stack, cannot propagate error.");
   }
 
   // Unwind all the API scopes till the exit frame before propagating.
   ApiState* state = isolate->api_state();
   ASSERT(state != NULL);
-  state->UnwindScopes(isolate->top_exit_frame_info());
-  Exceptions::PropagateError(Error::Cast(obj));
+  const Error* error;
+  {
+    // We need to preserve the error object across the destruction of zones
+    // when the ApiScopes are unwound.  By using NoGCScope, we can ensure
+    // that GC won't touch the raw error object before creating a valid
+    // handle for it in the surviving zone.
+    NoGCScope no_gc;
+    RawError* raw_error = static_cast<RawError*>(Api::UnwrapHandle(handle));
+    state->UnwindScopes(isolate->top_exit_frame_info());
+    error = &Error::Handle(isolate, raw_error);
+  }
+  Exceptions::PropagateError(*error);
   UNREACHABLE();
-
   return Api::NewError("Cannot reach here.  Internal error.");
 }
 
 
 DART_EXPORT void _Dart_ReportErrorHandle(const char* file,
                                          int line,
                                          const char* handle,
                                          const char* message) {
   fprintf(stderr, "%s:%d: error handle: '%s':\n    '%s'\n",
           file, line, handle, message);
@@ skipping 644 matching lines @@
   CHECK_ISOLATE_SCOPE(isolate);
   ApiState* state = isolate->api_state();
   ApiLocalScope* scope = state->top_scope();
 
   state->set_top_scope(scope->previous());  // Reset top scope to previous.
   delete scope;  // Free up the old scope which we have just exited.
 }
 
 
 DART_EXPORT uint8_t* Dart_ScopeAllocate(intptr_t size) {
-  ApiZone* zone;
+  Zone* zone;
   Isolate* isolate = Isolate::Current();
   if (isolate != NULL) {
     ApiState* state = isolate->api_state();
     if (state == NULL) return NULL;
     ApiLocalScope* scope = state->top_scope();
     zone = scope->zone();
   } else {
     ApiNativeScope* scope = ApiNativeScope::Current();
     if (scope == NULL) return NULL;
     zone = scope->zone();
@@ skipping 2734 matching lines @@
   instance.SetNativeField(index, value);
   return Api::Success(isolate);
 }
 
 
 // --- Exceptions ----
 
 
 DART_EXPORT Dart_Handle Dart_ThrowException(Dart_Handle exception) {
   Isolate* isolate = Isolate::Current();
-  DARTSCOPE(isolate);
-  const Instance& excp = Api::UnwrapInstanceHandle(isolate, exception);
-  if (excp.IsNull()) {
-    RETURN_TYPE_ERROR(isolate, exception, Instance);
+  CHECK_ISOLATE(isolate);
+  {
+    const Instance& excp = Api::UnwrapInstanceHandle(isolate, exception);
+    if (excp.IsNull()) {
+      RETURN_TYPE_ERROR(isolate, exception, Instance);
+    }
   }
   if (isolate->top_exit_frame_info() == 0) {
     // There are no dart frames on the stack so it would be illegal to
     // throw an exception here.
     return Api::NewError("No Dart frames on stack, cannot throw exception");
   }
   // Unwind all the API scopes till the exit frame before throwing an
   // exception.
   ApiState* state = isolate->api_state();
   ASSERT(state != NULL);
-  state->UnwindScopes(isolate->top_exit_frame_info());
-  Exceptions::Throw(excp);
+  const Instance* saved_exception;
+  {
+    NoGCScope no_gc;
+    RawInstance* raw_exception =
+        static_cast<RawInstance*>(Api::UnwrapHandle(exception));
+    state->UnwindScopes(isolate->top_exit_frame_info());
+    saved_exception = &Instance::Handle(raw_exception);
+  }
+  Exceptions::Throw(*saved_exception);
   return Api::NewError("Exception was not thrown, internal error");
 }
 
 
 DART_EXPORT Dart_Handle Dart_ReThrowException(Dart_Handle exception,
                                               Dart_Handle stacktrace) {
   Isolate* isolate = Isolate::Current();
   CHECK_ISOLATE(isolate);
-  DARTSCOPE(isolate);
-  const Instance& excp = Api::UnwrapInstanceHandle(isolate, exception);
-  if (excp.IsNull()) {
-    RETURN_TYPE_ERROR(isolate, exception, Instance);
-  }
-  const Instance& stk = Api::UnwrapInstanceHandle(isolate, stacktrace);
-  if (stk.IsNull()) {
-    RETURN_TYPE_ERROR(isolate, stacktrace, Instance);
+  {
+    const Instance& excp = Api::UnwrapInstanceHandle(isolate, exception);
+    if (excp.IsNull()) {
+      RETURN_TYPE_ERROR(isolate, exception, Instance);
+    }
+    const Instance& stk = Api::UnwrapInstanceHandle(isolate, stacktrace);
+    if (stk.IsNull()) {
+      RETURN_TYPE_ERROR(isolate, stacktrace, Instance);
+    }
   }
   if (isolate->top_exit_frame_info() == 0) {
     // There are no dart frames on the stack so it would be illegal to
     // throw an exception here.
     return Api::NewError("No Dart frames on stack, cannot throw exception");
   }
   // Unwind all the API scopes till the exit frame before throwing an
   // exception.
   ApiState* state = isolate->api_state();
   ASSERT(state != NULL);
-  state->UnwindScopes(isolate->top_exit_frame_info());
-  Exceptions::ReThrow(excp, stk);
+  const Instance* saved_exception;
+  const Instance* saved_stacktrace;
+  {
+    NoGCScope no_gc;
+    RawInstance* raw_exception =
+        static_cast<RawInstance*>(Api::UnwrapHandle(exception));
+    RawInstance* raw_stacktrace =
+        static_cast<RawInstance*>(Api::UnwrapHandle(stacktrace));
+    state->UnwindScopes(isolate->top_exit_frame_info());
+    saved_exception = &Instance::Handle(raw_exception);
+    saved_stacktrace = &Instance::Handle(raw_stacktrace);
+  }
+  Exceptions::ReThrow(*saved_exception, *saved_stacktrace);
   return Api::NewError("Exception was not re thrown, internal error");
 }
 
 
 // --- Native functions ---
 
 
 DART_EXPORT Dart_Handle Dart_GetNativeArgument(Dart_NativeArguments args,
                                                int index) {
   NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
@@ skipping 462 matching lines @@
 
 DART_EXPORT void Dart_GetPprofSymbolInfo(void** buffer, int* buffer_size) {
   Isolate* isolate = Isolate::Current();
   DebugInfo* pprof_symbol_generator = Dart::pprof_symbol_generator();
   if (pprof_symbol_generator != NULL) {
     DebugInfo::ByteBuffer* debug_region = new DebugInfo::ByteBuffer();
     ASSERT(debug_region != NULL);
     pprof_symbol_generator->WriteToMemory(debug_region);
     *buffer_size = debug_region->size();
     if (*buffer_size != 0) {
-      ApiZone* zone = Api::TopScope(isolate)->zone();
+      Zone* zone = Api::TopScope(isolate)->zone();
       *buffer = reinterpret_cast<void*>(zone->AllocUnsafe(*buffer_size));
       memmove(*buffer, debug_region->data(), *buffer_size);
     } else {
       *buffer = NULL;
     }
     delete debug_region;
   } else {
     *buffer = NULL;
     *buffer_size = 0;
   }
@@ skipping 40 matching lines @@
   }
   {
     NoGCScope no_gc;
     RawObject* raw_obj = obj.raw();
     isolate->heap()->SetPeer(raw_obj, peer);
   }
   return Api::Success(isolate);
 }
 
 }  // namespace dart