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599 lines
20 KiB
599 lines
20 KiB
// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_TOP_H_
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#define V8_TOP_H_
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#include "atomicops.h"
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#include "compilation-cache.h"
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#include "frames-inl.h"
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#include "runtime-profiler.h"
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#include "simulator.h"
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namespace v8 {
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namespace internal {
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#define RETURN_IF_SCHEDULED_EXCEPTION() \
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if (Top::has_scheduled_exception()) return Top::PromoteScheduledException()
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// Top has static variables used for JavaScript execution.
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class SaveContext; // Forward declaration.
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class ThreadVisitor; // Defined in v8threads.h
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class VMState; // Defined in vm-state.h
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class ThreadLocalTop BASE_EMBEDDED {
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public:
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// Initialize the thread data.
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void Initialize();
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// Get the top C++ try catch handler or NULL if none are registered.
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//
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// This method is not guarenteed to return an address that can be
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// used for comparison with addresses into the JS stack. If such an
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// address is needed, use try_catch_handler_address.
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v8::TryCatch* TryCatchHandler();
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// Get the address of the top C++ try catch handler or NULL if
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// none are registered.
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//
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// This method always returns an address that can be compared to
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// pointers into the JavaScript stack. When running on actual
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// hardware, try_catch_handler_address and TryCatchHandler return
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// the same pointer. When running on a simulator with a separate JS
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// stack, try_catch_handler_address returns a JS stack address that
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// corresponds to the place on the JS stack where the C++ handler
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// would have been if the stack were not separate.
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inline Address try_catch_handler_address() {
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return try_catch_handler_address_;
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}
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// Set the address of the top C++ try catch handler.
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inline void set_try_catch_handler_address(Address address) {
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try_catch_handler_address_ = address;
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}
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void Free() {
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ASSERT(!has_pending_message_);
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ASSERT(!external_caught_exception_);
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ASSERT(try_catch_handler_address_ == NULL);
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}
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// The context where the current execution method is created and for variable
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// lookups.
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Context* context_;
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int thread_id_;
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MaybeObject* pending_exception_;
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bool has_pending_message_;
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const char* pending_message_;
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Object* pending_message_obj_;
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Script* pending_message_script_;
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int pending_message_start_pos_;
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int pending_message_end_pos_;
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// Use a separate value for scheduled exceptions to preserve the
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// invariants that hold about pending_exception. We may want to
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// unify them later.
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MaybeObject* scheduled_exception_;
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bool external_caught_exception_;
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SaveContext* save_context_;
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v8::TryCatch* catcher_;
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// Stack.
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Address c_entry_fp_; // the frame pointer of the top c entry frame
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Address handler_; // try-blocks are chained through the stack
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#ifdef USE_SIMULATOR
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#ifdef V8_TARGET_ARCH_ARM
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Simulator* simulator_;
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#elif V8_TARGET_ARCH_MIPS
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assembler::mips::Simulator* simulator_;
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#endif
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#endif // USE_SIMULATOR
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#ifdef ENABLE_LOGGING_AND_PROFILING
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Address js_entry_sp_; // the stack pointer of the bottom js entry frame
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Address external_callback_; // the external callback we're currently in
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#endif
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#ifdef ENABLE_VMSTATE_TRACKING
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StateTag current_vm_state_;
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// Used for communication with the runtime profiler thread.
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// Possible values are specified in RuntimeProfilerState.
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Atomic32 runtime_profiler_state_;
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#endif
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// Generated code scratch locations.
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int32_t formal_count_;
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// Call back function to report unsafe JS accesses.
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v8::FailedAccessCheckCallback failed_access_check_callback_;
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private:
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Address try_catch_handler_address_;
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};
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#define TOP_ADDRESS_LIST(C) \
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C(handler_address) \
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C(c_entry_fp_address) \
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C(context_address) \
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C(pending_exception_address) \
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C(external_caught_exception_address)
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#ifdef ENABLE_LOGGING_AND_PROFILING
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#define TOP_ADDRESS_LIST_PROF(C) \
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C(js_entry_sp_address)
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#else
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#define TOP_ADDRESS_LIST_PROF(C)
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#endif
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class Top {
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public:
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enum AddressId {
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#define C(name) k_##name,
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TOP_ADDRESS_LIST(C)
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TOP_ADDRESS_LIST_PROF(C)
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#undef C
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k_top_address_count
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};
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static Address get_address_from_id(AddressId id);
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// Access to top context (where the current function object was created).
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static Context* context() { return thread_local_.context_; }
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static void set_context(Context* context) {
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thread_local_.context_ = context;
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}
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static Context** context_address() { return &thread_local_.context_; }
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static SaveContext* save_context() {return thread_local_.save_context_; }
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static void set_save_context(SaveContext* save) {
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thread_local_.save_context_ = save;
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}
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// Access to current thread id.
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static int thread_id() { return thread_local_.thread_id_; }
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static void set_thread_id(int id) { thread_local_.thread_id_ = id; }
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// Interface to pending exception.
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static MaybeObject* pending_exception() {
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ASSERT(has_pending_exception());
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return thread_local_.pending_exception_;
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}
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static bool external_caught_exception() {
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return thread_local_.external_caught_exception_;
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}
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static void set_pending_exception(MaybeObject* exception) {
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thread_local_.pending_exception_ = exception;
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}
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static void clear_pending_exception() {
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thread_local_.pending_exception_ = Heap::the_hole_value();
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}
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static MaybeObject** pending_exception_address() {
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return &thread_local_.pending_exception_;
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}
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static bool has_pending_exception() {
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return !thread_local_.pending_exception_->IsTheHole();
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}
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static void clear_pending_message() {
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thread_local_.has_pending_message_ = false;
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thread_local_.pending_message_ = NULL;
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thread_local_.pending_message_obj_ = Heap::the_hole_value();
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thread_local_.pending_message_script_ = NULL;
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}
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static v8::TryCatch* try_catch_handler() {
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return thread_local_.TryCatchHandler();
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}
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static Address try_catch_handler_address() {
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return thread_local_.try_catch_handler_address();
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}
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// This method is called by the api after operations that may throw
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// exceptions. If an exception was thrown and not handled by an external
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// handler the exception is scheduled to be rethrown when we return to running
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// JavaScript code. If an exception is scheduled true is returned.
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static bool OptionalRescheduleException(bool is_bottom_call);
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static bool* external_caught_exception_address() {
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return &thread_local_.external_caught_exception_;
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}
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static MaybeObject** scheduled_exception_address() {
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return &thread_local_.scheduled_exception_;
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}
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static MaybeObject* scheduled_exception() {
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ASSERT(has_scheduled_exception());
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return thread_local_.scheduled_exception_;
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}
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static bool has_scheduled_exception() {
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return !thread_local_.scheduled_exception_->IsTheHole();
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}
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static void clear_scheduled_exception() {
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thread_local_.scheduled_exception_ = Heap::the_hole_value();
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}
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static void setup_external_caught() {
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thread_local_.external_caught_exception_ =
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has_pending_exception() &&
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(thread_local_.catcher_ != NULL) &&
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(try_catch_handler() == thread_local_.catcher_);
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}
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static void SetCaptureStackTraceForUncaughtExceptions(
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bool capture,
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int frame_limit,
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StackTrace::StackTraceOptions options);
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// Tells whether the current context has experienced an out of memory
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// exception.
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static bool is_out_of_memory();
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// JS execution stack (see frames.h).
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static Address c_entry_fp(ThreadLocalTop* thread) {
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return thread->c_entry_fp_;
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}
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static Address handler(ThreadLocalTop* thread) { return thread->handler_; }
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static inline Address* c_entry_fp_address() {
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return &thread_local_.c_entry_fp_;
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}
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static inline Address* handler_address() { return &thread_local_.handler_; }
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#ifdef ENABLE_LOGGING_AND_PROFILING
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// Bottom JS entry (see StackTracer::Trace in log.cc).
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static Address js_entry_sp(ThreadLocalTop* thread) {
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return thread->js_entry_sp_;
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}
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static inline Address* js_entry_sp_address() {
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return &thread_local_.js_entry_sp_;
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}
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static Address external_callback() {
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return thread_local_.external_callback_;
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}
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static void set_external_callback(Address callback) {
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thread_local_.external_callback_ = callback;
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}
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#endif
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#ifdef ENABLE_VMSTATE_TRACKING
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static StateTag current_vm_state() {
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return thread_local_.current_vm_state_;
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}
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static void SetCurrentVMState(StateTag state) {
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if (RuntimeProfiler::IsEnabled()) {
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if (state == JS) {
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// JS or non-JS -> JS transition.
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RuntimeProfilerState old_state = SwapRuntimeProfilerState(PROF_IN_JS);
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if (old_state == PROF_NOT_IN_JS_WAITING_FOR_JS) {
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// If the runtime profiler was waiting, we reset the eager
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// optimizing data in the compilation cache to get a fresh
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// start after not running JavaScript code for a while and
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// signal the runtime profiler so it can resume.
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CompilationCache::ResetEagerOptimizingData();
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runtime_profiler_semaphore_->Signal();
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}
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} else if (thread_local_.current_vm_state_ == JS) {
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// JS -> non-JS transition. Update the runtime profiler state.
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ASSERT(IsInJSState());
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SetRuntimeProfilerState(PROF_NOT_IN_JS);
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}
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}
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thread_local_.current_vm_state_ = state;
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}
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// Called in the runtime profiler thread.
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// Returns whether the current VM state is set to JS.
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static bool IsInJSState() {
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ASSERT(RuntimeProfiler::IsEnabled());
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return static_cast<RuntimeProfilerState>(
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NoBarrier_Load(&thread_local_.runtime_profiler_state_)) == PROF_IN_JS;
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}
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// Called in the runtime profiler thread.
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// Waits for the VM state to transtion from non-JS to JS. Returns
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// true when notified of the transition, false when the current
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// state is not the expected non-JS state.
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static bool WaitForJSState() {
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ASSERT(RuntimeProfiler::IsEnabled());
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// Try to switch to waiting state.
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RuntimeProfilerState old_state = CompareAndSwapRuntimeProfilerState(
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PROF_NOT_IN_JS, PROF_NOT_IN_JS_WAITING_FOR_JS);
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if (old_state == PROF_NOT_IN_JS) {
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runtime_profiler_semaphore_->Wait();
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return true;
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}
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return false;
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}
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// When shutting down we join the profiler thread. Doing so while
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// it's waiting on a semaphore will cause a deadlock, so we have to
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// wake it up first.
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static void WakeUpRuntimeProfilerThreadBeforeShutdown() {
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runtime_profiler_semaphore_->Signal();
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}
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#endif
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// Generated code scratch locations.
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static void* formal_count_address() { return &thread_local_.formal_count_; }
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static void PrintCurrentStackTrace(FILE* out);
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static void PrintStackTrace(FILE* out, char* thread_data);
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static void PrintStack(StringStream* accumulator);
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static void PrintStack();
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static Handle<String> StackTraceString();
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static Handle<JSArray> CaptureCurrentStackTrace(
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int frame_limit,
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StackTrace::StackTraceOptions options);
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// Returns if the top context may access the given global object. If
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// the result is false, the pending exception is guaranteed to be
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// set.
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static bool MayNamedAccess(JSObject* receiver,
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Object* key,
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v8::AccessType type);
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static bool MayIndexedAccess(JSObject* receiver,
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uint32_t index,
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v8::AccessType type);
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static void SetFailedAccessCheckCallback(
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v8::FailedAccessCheckCallback callback);
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static void ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type);
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// Exception throwing support. The caller should use the result
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// of Throw() as its return value.
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static Failure* Throw(Object* exception, MessageLocation* location = NULL);
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// Re-throw an exception. This involves no error reporting since
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// error reporting was handled when the exception was thrown
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// originally.
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static Failure* ReThrow(MaybeObject* exception,
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MessageLocation* location = NULL);
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static void ScheduleThrow(Object* exception);
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static void ReportPendingMessages();
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static Failure* ThrowIllegalOperation();
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// Promote a scheduled exception to pending. Asserts has_scheduled_exception.
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static Failure* PromoteScheduledException();
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static void DoThrow(MaybeObject* exception,
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MessageLocation* location,
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const char* message);
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// Checks if exception should be reported and finds out if it's
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// caught externally.
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static bool ShouldReportException(bool* is_caught_externally,
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bool catchable_by_javascript);
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// Attempts to compute the current source location, storing the
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// result in the target out parameter.
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static void ComputeLocation(MessageLocation* target);
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// Override command line flag.
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static void TraceException(bool flag);
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// Out of resource exception helpers.
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static Failure* StackOverflow();
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static Failure* TerminateExecution();
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// Administration
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static void Initialize();
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static void TearDown();
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static void Iterate(ObjectVisitor* v);
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static void Iterate(ObjectVisitor* v, ThreadLocalTop* t);
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static char* Iterate(ObjectVisitor* v, char* t);
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static void IterateThread(ThreadVisitor* v);
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static void IterateThread(ThreadVisitor* v, char* t);
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// Returns the global object of the current context. It could be
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// a builtin object, or a js global object.
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static Handle<GlobalObject> global() {
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return Handle<GlobalObject>(context()->global());
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}
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// Returns the global proxy object of the current context.
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static Object* global_proxy() {
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return context()->global_proxy();
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}
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// Returns the current global context.
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static Handle<Context> global_context();
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// Returns the global context of the calling JavaScript code. That
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// is, the global context of the top-most JavaScript frame.
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static Handle<Context> GetCallingGlobalContext();
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static Handle<JSBuiltinsObject> builtins() {
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return Handle<JSBuiltinsObject>(thread_local_.context_->builtins());
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}
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static void RegisterTryCatchHandler(v8::TryCatch* that);
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static void UnregisterTryCatchHandler(v8::TryCatch* that);
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#define TOP_GLOBAL_CONTEXT_FIELD_ACCESSOR(index, type, name) \
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static Handle<type> name() { \
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return Handle<type>(context()->global_context()->name()); \
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}
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GLOBAL_CONTEXT_FIELDS(TOP_GLOBAL_CONTEXT_FIELD_ACCESSOR)
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#undef TOP_GLOBAL_CONTEXT_FIELD_ACCESSOR
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static inline ThreadLocalTop* GetCurrentThread() { return &thread_local_; }
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static int ArchiveSpacePerThread() { return sizeof(ThreadLocalTop); }
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static char* ArchiveThread(char* to);
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static char* RestoreThread(char* from);
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static void FreeThreadResources() { thread_local_.Free(); }
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static const char* kStackOverflowMessage;
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private:
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#ifdef ENABLE_VMSTATE_TRACKING
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// Set of states used when communicating with the runtime profiler.
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//
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// The set of possible transitions is divided between the VM and the
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// profiler threads.
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//
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// The VM thread can perform these transitions:
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// o IN_JS -> NOT_IN_JS
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// o NOT_IN_JS -> IN_JS
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// o NOT_IN_JS_WAITING_FOR_JS -> IN_JS notifying the profiler thread
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// using the semaphore.
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// All the above transitions are caused by VM state changes.
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//
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// The profiler thread can only perform a single transition
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// NOT_IN_JS -> NOT_IN_JS_WAITING_FOR_JS before it starts waiting on
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// the semaphore.
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enum RuntimeProfilerState {
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PROF_NOT_IN_JS,
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PROF_NOT_IN_JS_WAITING_FOR_JS,
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PROF_IN_JS
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};
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static void SetRuntimeProfilerState(RuntimeProfilerState state) {
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NoBarrier_Store(&thread_local_.runtime_profiler_state_, state);
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}
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static RuntimeProfilerState SwapRuntimeProfilerState(
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RuntimeProfilerState state) {
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return static_cast<RuntimeProfilerState>(
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NoBarrier_AtomicExchange(&thread_local_.runtime_profiler_state_,
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state));
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}
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static RuntimeProfilerState CompareAndSwapRuntimeProfilerState(
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RuntimeProfilerState old_state,
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RuntimeProfilerState state) {
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return static_cast<RuntimeProfilerState>(
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NoBarrier_CompareAndSwap(&thread_local_.runtime_profiler_state_,
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old_state,
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state));
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}
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static Semaphore* runtime_profiler_semaphore_;
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#endif // ENABLE_VMSTATE_TRACKING
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// The context that initiated this JS execution.
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static ThreadLocalTop thread_local_;
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static void InitializeThreadLocal();
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static void PrintStackTrace(FILE* out, ThreadLocalTop* thread);
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static void MarkCompactPrologue(bool is_compacting,
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ThreadLocalTop* archived_thread_data);
|
|
static void MarkCompactEpilogue(bool is_compacting,
|
|
ThreadLocalTop* archived_thread_data);
|
|
|
|
// Debug.
|
|
// Mutex for serializing access to break control structures.
|
|
static Mutex* break_access_;
|
|
|
|
friend class SaveContext;
|
|
friend class AssertNoContextChange;
|
|
friend class ExecutionAccess;
|
|
friend class ThreadLocalTop;
|
|
|
|
static void FillCache();
|
|
};
|
|
|
|
|
|
// If the GCC version is 4.1.x or 4.2.x an additional field is added to the
|
|
// class as a work around for a bug in the generated code found with these
|
|
// versions of GCC. See V8 issue 122 for details.
|
|
class SaveContext BASE_EMBEDDED {
|
|
public:
|
|
SaveContext()
|
|
: context_(Top::context()),
|
|
#if __GNUC_VERSION__ >= 40100 && __GNUC_VERSION__ < 40300
|
|
dummy_(Top::context()),
|
|
#endif
|
|
prev_(Top::save_context()) {
|
|
Top::set_save_context(this);
|
|
|
|
// If there is no JS frame under the current C frame, use the value 0.
|
|
JavaScriptFrameIterator it;
|
|
js_sp_ = it.done() ? 0 : it.frame()->sp();
|
|
}
|
|
|
|
~SaveContext() {
|
|
Top::set_context(*context_);
|
|
Top::set_save_context(prev_);
|
|
}
|
|
|
|
Handle<Context> context() { return context_; }
|
|
SaveContext* prev() { return prev_; }
|
|
|
|
// Returns true if this save context is below a given JavaScript frame.
|
|
bool below(JavaScriptFrame* frame) {
|
|
return (js_sp_ == 0) || (frame->sp() < js_sp_);
|
|
}
|
|
|
|
private:
|
|
Handle<Context> context_;
|
|
#if __GNUC_VERSION__ >= 40100 && __GNUC_VERSION__ < 40300
|
|
Handle<Context> dummy_;
|
|
#endif
|
|
SaveContext* prev_;
|
|
Address js_sp_; // The top JS frame's sp when saving context.
|
|
};
|
|
|
|
|
|
class AssertNoContextChange BASE_EMBEDDED {
|
|
#ifdef DEBUG
|
|
public:
|
|
AssertNoContextChange() :
|
|
context_(Top::context()) {
|
|
}
|
|
|
|
~AssertNoContextChange() {
|
|
ASSERT(Top::context() == *context_);
|
|
}
|
|
|
|
private:
|
|
HandleScope scope_;
|
|
Handle<Context> context_;
|
|
#else
|
|
public:
|
|
AssertNoContextChange() { }
|
|
#endif
|
|
};
|
|
|
|
|
|
class ExecutionAccess BASE_EMBEDDED {
|
|
public:
|
|
ExecutionAccess() { Lock(); }
|
|
~ExecutionAccess() { Unlock(); }
|
|
|
|
static void Lock() { Top::break_access_->Lock(); }
|
|
static void Unlock() { Top::break_access_->Unlock(); }
|
|
|
|
static bool TryLock() {
|
|
return Top::break_access_->TryLock();
|
|
}
|
|
};
|
|
|
|
} } // namespace v8::internal
|
|
|
|
#endif // V8_TOP_H_
|
|
|