| // Copyright (c) 2011, 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 <setjmp.h> |
| |
| #include "vm/exceptions.h" |
| |
| #include "platform/address_sanitizer.h" |
| #include "platform/thread_sanitizer.h" |
| |
| #include "lib/stacktrace.h" |
| |
| #include "vm/dart_api_impl.h" |
| #include "vm/dart_entry.h" |
| #include "vm/datastream.h" |
| #include "vm/debugger.h" |
| #include "vm/deopt_instructions.h" |
| #include "vm/flags.h" |
| #include "vm/log.h" |
| #include "vm/longjump.h" |
| #include "vm/object.h" |
| #include "vm/object_store.h" |
| #include "vm/stack_frame.h" |
| #include "vm/stub_code.h" |
| #include "vm/symbols.h" |
| |
| namespace dart { |
| |
| DECLARE_FLAG(bool, trace_deoptimization); |
| DEFINE_FLAG(bool, |
| print_stacktrace_at_throw, |
| false, |
| "Prints a stack trace everytime a throw occurs."); |
| |
| class StackTraceBuilder : public ValueObject { |
| public: |
| StackTraceBuilder() {} |
| virtual ~StackTraceBuilder() {} |
| |
| virtual void AddFrame(const Object& code, uword pc_offset) = 0; |
| }; |
| |
| class PreallocatedStackTraceBuilder : public StackTraceBuilder { |
| public: |
| explicit PreallocatedStackTraceBuilder(const Instance& stacktrace) |
| : stacktrace_(StackTrace::Cast(stacktrace)), |
| cur_index_(0), |
| dropped_frames_(0) { |
| ASSERT( |
| stacktrace_.ptr() == |
| Isolate::Current()->isolate_object_store()->preallocated_stack_trace()); |
| } |
| ~PreallocatedStackTraceBuilder() {} |
| |
| void AddFrame(const Object& code, uword pc_offset) override; |
| |
| private: |
| static const int kNumTopframes = StackTrace::kPreallocatedStackdepth / 2; |
| |
| const StackTrace& stacktrace_; |
| intptr_t cur_index_; |
| intptr_t dropped_frames_; |
| |
| DISALLOW_COPY_AND_ASSIGN(PreallocatedStackTraceBuilder); |
| }; |
| |
| void PreallocatedStackTraceBuilder::AddFrame(const Object& code, |
| uword pc_offset) { |
| if (cur_index_ >= StackTrace::kPreallocatedStackdepth) { |
| // The number of frames is overflowing the preallocated stack trace object. |
| Object& frame_code = Object::Handle(); |
| intptr_t start = StackTrace::kPreallocatedStackdepth - (kNumTopframes - 1); |
| intptr_t null_slot = start - 2; |
| // We are going to drop one frame. |
| dropped_frames_++; |
| // Add an empty slot to indicate the overflow so that the toString |
| // method can account for the overflow. |
| if (stacktrace_.CodeAtFrame(null_slot) != Code::null()) { |
| stacktrace_.SetCodeAtFrame(null_slot, frame_code); |
| // We drop an extra frame here too. |
| dropped_frames_++; |
| } |
| // Encode the number of dropped frames into the pc offset. |
| stacktrace_.SetPcOffsetAtFrame(null_slot, dropped_frames_); |
| // Move frames one slot down so that we can accommodate the new frame. |
| for (intptr_t i = start; i < StackTrace::kPreallocatedStackdepth; i++) { |
| intptr_t prev = (i - 1); |
| frame_code = stacktrace_.CodeAtFrame(i); |
| const uword frame_offset = stacktrace_.PcOffsetAtFrame(i); |
| stacktrace_.SetCodeAtFrame(prev, frame_code); |
| stacktrace_.SetPcOffsetAtFrame(prev, frame_offset); |
| } |
| cur_index_ = (StackTrace::kPreallocatedStackdepth - 1); |
| } |
| stacktrace_.SetCodeAtFrame(cur_index_, code); |
| stacktrace_.SetPcOffsetAtFrame(cur_index_, pc_offset); |
| cur_index_ += 1; |
| } |
| |
| static void BuildStackTrace(StackTraceBuilder* builder) { |
| StackFrameIterator frames(ValidationPolicy::kDontValidateFrames, |
| Thread::Current(), |
| StackFrameIterator::kNoCrossThreadIteration); |
| StackFrame* frame = frames.NextFrame(); |
| ASSERT(frame != NULL); // We expect to find a dart invocation frame. |
| Code& code = Code::Handle(); |
| for (; frame != NULL; frame = frames.NextFrame()) { |
| if (!frame->IsDartFrame()) { |
| continue; |
| } |
| code = frame->LookupDartCode(); |
| ASSERT(code.ContainsInstructionAt(frame->pc())); |
| const uword pc_offset = frame->pc() - code.PayloadStart(); |
| builder->AddFrame(code, pc_offset); |
| } |
| } |
| |
| class ExceptionHandlerFinder : public StackResource { |
| public: |
| explicit ExceptionHandlerFinder(Thread* thread) |
| : StackResource(thread), thread_(thread) {} |
| |
| // Iterate through the stack frames and try to find a frame with an |
| // exception handler. Once found, set the pc, sp and fp so that execution |
| // can continue in that frame. Sets 'needs_stacktrace' if there is no |
| // catch-all handler or if a stack-trace is specified in the catch. |
| bool Find() { |
| StackFrameIterator frames(ValidationPolicy::kDontValidateFrames, |
| Thread::Current(), |
| StackFrameIterator::kNoCrossThreadIteration); |
| StackFrame* frame = frames.NextFrame(); |
| if (frame == NULL) return false; // No Dart frame. |
| handler_pc_set_ = false; |
| needs_stacktrace = false; |
| bool is_catch_all = false; |
| uword temp_handler_pc = kUwordMax; |
| bool is_optimized = false; |
| code_ = NULL; |
| catch_entry_moves_cache_ = thread_->isolate()->catch_entry_moves_cache(); |
| |
| while (!frame->IsEntryFrame()) { |
| if (frame->IsDartFrame()) { |
| if (frame->FindExceptionHandler(thread_, &temp_handler_pc, |
| &needs_stacktrace, &is_catch_all, |
| &is_optimized)) { |
| if (!handler_pc_set_) { |
| handler_pc_set_ = true; |
| handler_pc = temp_handler_pc; |
| handler_sp = frame->sp(); |
| handler_fp = frame->fp(); |
| if (is_optimized) { |
| pc_ = frame->pc(); |
| code_ = &Code::Handle(frame->LookupDartCode()); |
| CatchEntryMovesRefPtr* cached_catch_entry_moves = |
| catch_entry_moves_cache_->Lookup(pc_); |
| if (cached_catch_entry_moves != NULL) { |
| cached_catch_entry_moves_ = *cached_catch_entry_moves; |
| } |
| if (cached_catch_entry_moves_.IsEmpty()) { |
| #if defined(DART_PRECOMPILED_RUNTIME) |
| // Only AOT mode is supported. |
| ReadCompressedCatchEntryMoves(); |
| #elif defined(DART_PRECOMPILER) |
| // Both AOT and JIT modes are supported. |
| if (FLAG_precompiled_mode) { |
| ReadCompressedCatchEntryMoves(); |
| } else { |
| GetCatchEntryMovesFromDeopt(code_->num_variables(), frame); |
| } |
| #else |
| // Only JIT mode is supported. |
| ASSERT(!FLAG_precompiled_mode); |
| GetCatchEntryMovesFromDeopt(code_->num_variables(), frame); |
| #endif |
| } |
| } |
| } |
| if (needs_stacktrace || is_catch_all) { |
| return true; |
| } |
| } |
| } // if frame->IsDartFrame |
| frame = frames.NextFrame(); |
| ASSERT(frame != NULL); |
| } // while !frame->IsEntryFrame |
| ASSERT(frame->IsEntryFrame()); |
| if (!handler_pc_set_) { |
| handler_pc = frame->pc(); |
| handler_sp = frame->sp(); |
| handler_fp = frame->fp(); |
| } |
| // No catch-all encountered, needs stacktrace. |
| needs_stacktrace = true; |
| return handler_pc_set_; |
| } |
| |
| // When entering catch block in the optimized code we need to execute |
| // catch entry moves that would morph the state of the frame into |
| // what catch entry expects. |
| void PrepareFrameForCatchEntry() { |
| if (code_ == nullptr || !code_->is_optimized()) { |
| return; |
| } |
| |
| if (cached_catch_entry_moves_.IsEmpty()) { |
| catch_entry_moves_cache_->Insert( |
| pc_, CatchEntryMovesRefPtr(catch_entry_moves_)); |
| } else { |
| catch_entry_moves_ = &cached_catch_entry_moves_.moves(); |
| } |
| |
| ExecuteCatchEntryMoves(*catch_entry_moves_); |
| } |
| |
| void ExecuteCatchEntryMoves(const CatchEntryMoves& moves) { |
| Zone* zone = Thread::Current()->zone(); |
| auto& value = Object::Handle(zone); |
| GrowableArray<Object*> dst_values; |
| |
| uword fp = handler_fp; |
| ObjectPool* pool = nullptr; |
| for (int j = 0; j < moves.count(); j++) { |
| const CatchEntryMove& move = moves.At(j); |
| |
| switch (move.source_kind()) { |
| case CatchEntryMove::SourceKind::kConstant: |
| if (pool == nullptr) { |
| pool = &ObjectPool::Handle(code_->GetObjectPool()); |
| } |
| value = pool->ObjectAt(move.src_slot()); |
| break; |
| |
| case CatchEntryMove::SourceKind::kTaggedSlot: |
| value = *TaggedSlotAt(fp, move.src_slot()); |
| break; |
| |
| case CatchEntryMove::SourceKind::kDoubleSlot: |
| value = Double::New(*SlotAt<double>(fp, move.src_slot())); |
| break; |
| |
| case CatchEntryMove::SourceKind::kFloat32x4Slot: |
| value = Float32x4::New(*SlotAt<simd128_value_t>(fp, move.src_slot())); |
| break; |
| |
| case CatchEntryMove::SourceKind::kFloat64x2Slot: |
| value = Float64x2::New(*SlotAt<simd128_value_t>(fp, move.src_slot())); |
| break; |
| |
| case CatchEntryMove::SourceKind::kInt32x4Slot: |
| value = Int32x4::New(*SlotAt<simd128_value_t>(fp, move.src_slot())); |
| break; |
| |
| case CatchEntryMove::SourceKind::kInt64PairSlot: |
| value = Integer::New( |
| Utils::LowHighTo64Bits(*SlotAt<uint32_t>(fp, move.src_lo_slot()), |
| *SlotAt<int32_t>(fp, move.src_hi_slot()))); |
| break; |
| |
| case CatchEntryMove::SourceKind::kInt64Slot: |
| value = Integer::New(*SlotAt<int64_t>(fp, move.src_slot())); |
| break; |
| |
| case CatchEntryMove::SourceKind::kInt32Slot: |
| value = Integer::New(*SlotAt<int32_t>(fp, move.src_slot())); |
| break; |
| |
| case CatchEntryMove::SourceKind::kUint32Slot: |
| value = Integer::New(*SlotAt<uint32_t>(fp, move.src_slot())); |
| break; |
| |
| default: |
| UNREACHABLE(); |
| } |
| |
| dst_values.Add(&Object::Handle(zone, value.ptr())); |
| } |
| |
| { |
| NoSafepointScope no_safepoint_scope; |
| |
| for (int j = 0; j < moves.count(); j++) { |
| const CatchEntryMove& move = moves.At(j); |
| *TaggedSlotAt(fp, move.dest_slot()) = dst_values[j]->ptr(); |
| } |
| } |
| } |
| |
| #if defined(DART_PRECOMPILED_RUNTIME) || defined(DART_PRECOMPILER) |
| void ReadCompressedCatchEntryMoves() { |
| const intptr_t pc_offset = pc_ - code_->PayloadStart(); |
| const auto& td = TypedData::Handle(code_->catch_entry_moves_maps()); |
| |
| CatchEntryMovesMapReader reader(td); |
| catch_entry_moves_ = reader.ReadMovesForPcOffset(pc_offset); |
| } |
| #endif // defined(DART_PRECOMPILED_RUNTIME) || defined(DART_PRECOMPILER) |
| |
| #if !defined(DART_PRECOMPILED_RUNTIME) |
| void GetCatchEntryMovesFromDeopt(intptr_t num_vars, StackFrame* frame) { |
| Isolate* isolate = thread_->isolate(); |
| DeoptContext* deopt_context = |
| new DeoptContext(frame, *code_, DeoptContext::kDestIsAllocated, NULL, |
| NULL, true, false /* deoptimizing_code */); |
| isolate->set_deopt_context(deopt_context); |
| |
| catch_entry_moves_ = deopt_context->ToCatchEntryMoves(num_vars); |
| |
| isolate->set_deopt_context(NULL); |
| delete deopt_context; |
| } |
| #endif // !defined(DART_PRECOMPILED_RUNTIME) |
| |
| bool needs_stacktrace; |
| uword handler_pc; |
| uword handler_sp; |
| uword handler_fp; |
| |
| private: |
| template <typename T> |
| static T* SlotAt(uword fp, int stack_slot) { |
| const intptr_t frame_slot = |
| runtime_frame_layout.FrameSlotForVariableIndex(-stack_slot); |
| return reinterpret_cast<T*>(fp + frame_slot * kWordSize); |
| } |
| |
| static ObjectPtr* TaggedSlotAt(uword fp, int stack_slot) { |
| return SlotAt<ObjectPtr>(fp, stack_slot); |
| } |
| |
| typedef ReadStream::Raw<sizeof(intptr_t), intptr_t> Reader; |
| Thread* thread_; |
| Code* code_; |
| bool handler_pc_set_; |
| intptr_t pc_; // Current pc in the handler frame. |
| |
| const CatchEntryMoves* catch_entry_moves_ = nullptr; |
| CatchEntryMovesCache* catch_entry_moves_cache_ = nullptr; |
| CatchEntryMovesRefPtr cached_catch_entry_moves_; |
| }; |
| |
| CatchEntryMove CatchEntryMove::ReadFrom(ReadStream* stream) { |
| using Reader = ReadStream::Raw<sizeof(int32_t), int32_t>; |
| const int32_t src = Reader::Read(stream); |
| const int32_t dest_and_kind = Reader::Read(stream); |
| return CatchEntryMove(src, dest_and_kind); |
| } |
| |
| #if !defined(DART_PRECOMPILED_RUNTIME) |
| void CatchEntryMove::WriteTo(BaseWriteStream* stream) { |
| using Writer = BaseWriteStream::Raw<sizeof(int32_t), int32_t>; |
| Writer::Write(stream, src_); |
| Writer::Write(stream, dest_and_kind_); |
| } |
| #endif |
| |
| #if !defined(PRODUCT) || defined(FORCE_INCLUDE_DISASSEMBLER) |
| const char* CatchEntryMove::ToCString() const { |
| char from[256]; |
| |
| switch (source_kind()) { |
| case SourceKind::kConstant: |
| Utils::SNPrint(from, ARRAY_SIZE(from), "pp[%" Pd "]", src_slot()); |
| break; |
| |
| case SourceKind::kTaggedSlot: |
| Utils::SNPrint(from, ARRAY_SIZE(from), "fp[%" Pd "]", src_slot()); |
| break; |
| |
| case SourceKind::kDoubleSlot: |
| Utils::SNPrint(from, ARRAY_SIZE(from), "f64 [fp + %" Pd "]", |
| src_slot() * compiler::target::kWordSize); |
| break; |
| |
| case SourceKind::kFloat32x4Slot: |
| Utils::SNPrint(from, ARRAY_SIZE(from), "f32x4 [fp + %" Pd "]", |
| src_slot() * compiler::target::kWordSize); |
| break; |
| |
| case SourceKind::kFloat64x2Slot: |
| Utils::SNPrint(from, ARRAY_SIZE(from), "f64x2 [fp + %" Pd "]", |
| src_slot() * compiler::target::kWordSize); |
| break; |
| |
| case SourceKind::kInt32x4Slot: |
| Utils::SNPrint(from, ARRAY_SIZE(from), "i32x4 [fp + %" Pd "]", |
| src_slot() * compiler::target::kWordSize); |
| break; |
| |
| case SourceKind::kInt64PairSlot: |
| Utils::SNPrint(from, ARRAY_SIZE(from), |
| "i64 ([fp + %" Pd "], [fp + %" Pd "])", |
| src_lo_slot() * compiler::target::kWordSize, |
| src_hi_slot() * compiler::target::kWordSize); |
| break; |
| |
| case SourceKind::kInt64Slot: |
| Utils::SNPrint(from, ARRAY_SIZE(from), "i64 [fp + %" Pd "]", |
| src_slot() * compiler::target::kWordSize); |
| break; |
| |
| case SourceKind::kInt32Slot: |
| Utils::SNPrint(from, ARRAY_SIZE(from), "i32 [fp + %" Pd "]", |
| src_slot() * compiler::target::kWordSize); |
| break; |
| |
| case SourceKind::kUint32Slot: |
| Utils::SNPrint(from, ARRAY_SIZE(from), "u32 [fp + %" Pd "]", |
| src_slot() * compiler::target::kWordSize); |
| break; |
| |
| default: |
| UNREACHABLE(); |
| } |
| |
| return Thread::Current()->zone()->PrintToString("fp[%" Pd "] <- %s", |
| dest_slot(), from); |
| } |
| |
| void CatchEntryMovesMapReader::PrintEntries() { |
| NoSafepointScope no_safepoint; |
| |
| using Reader = ReadStream::Raw<sizeof(intptr_t), intptr_t>; |
| |
| ReadStream stream(static_cast<uint8_t*>(bytes_.DataAddr(0)), bytes_.Length()); |
| |
| while (stream.PendingBytes() > 0) { |
| const intptr_t stream_position = stream.Position(); |
| const intptr_t target_pc_offset = Reader::Read(&stream); |
| const intptr_t prefix_length = Reader::Read(&stream); |
| const intptr_t suffix_length = Reader::Read(&stream); |
| const intptr_t length = prefix_length + suffix_length; |
| Reader::Read(&stream); // Skip suffix_offset |
| for (intptr_t j = 0; j < prefix_length; j++) { |
| CatchEntryMove::ReadFrom(&stream); |
| } |
| |
| ReadStream inner_stream(static_cast<uint8_t*>(bytes_.DataAddr(0)), |
| bytes_.Length()); |
| CatchEntryMoves* moves = ReadCompressedCatchEntryMovesSuffix( |
| &inner_stream, stream_position, length); |
| THR_Print(" [code+0x%08" Px "]: (% " Pd " moves)\n", target_pc_offset, |
| moves->count()); |
| for (intptr_t i = 0; i < moves->count(); i++) { |
| THR_Print(" %s\n", moves->At(i).ToCString()); |
| } |
| CatchEntryMoves::Free(moves); |
| } |
| } |
| #endif // !defined(PRODUCT) || defined(FORCE_INCLUDE_DISASSEMBLER) |
| |
| CatchEntryMoves* CatchEntryMovesMapReader::ReadMovesForPcOffset( |
| intptr_t pc_offset) { |
| NoSafepointScope no_safepoint; |
| |
| ReadStream stream(static_cast<uint8_t*>(bytes_.DataAddr(0)), bytes_.Length()); |
| |
| intptr_t position = 0; |
| intptr_t length = 0; |
| FindEntryForPc(&stream, pc_offset, &position, &length); |
| |
| return ReadCompressedCatchEntryMovesSuffix(&stream, position, length); |
| } |
| |
| void CatchEntryMovesMapReader::FindEntryForPc(ReadStream* stream, |
| intptr_t pc_offset, |
| intptr_t* position, |
| intptr_t* length) { |
| using Reader = ReadStream::Raw<sizeof(intptr_t), intptr_t>; |
| |
| while (stream->PendingBytes() > 0) { |
| const intptr_t stream_position = stream->Position(); |
| const intptr_t target_pc_offset = Reader::Read(stream); |
| const intptr_t prefix_length = Reader::Read(stream); |
| const intptr_t suffix_length = Reader::Read(stream); |
| Reader::Read(stream); // Skip suffix_offset |
| if (pc_offset == target_pc_offset) { |
| *position = stream_position; |
| *length = prefix_length + suffix_length; |
| return; |
| } |
| |
| // Skip the prefix moves. |
| for (intptr_t j = 0; j < prefix_length; j++) { |
| CatchEntryMove::ReadFrom(stream); |
| } |
| } |
| |
| UNREACHABLE(); |
| } |
| |
| CatchEntryMoves* CatchEntryMovesMapReader::ReadCompressedCatchEntryMovesSuffix( |
| ReadStream* stream, |
| intptr_t offset, |
| intptr_t length) { |
| using Reader = ReadStream::Raw<sizeof(intptr_t), intptr_t>; |
| |
| CatchEntryMoves* moves = CatchEntryMoves::Allocate(length); |
| |
| intptr_t remaining_length = length; |
| |
| intptr_t moves_offset = 0; |
| while (remaining_length > 0) { |
| stream->SetPosition(offset); |
| Reader::Read(stream); // skip pc_offset |
| Reader::Read(stream); // skip prefix length |
| const intptr_t suffix_length = Reader::Read(stream); |
| const intptr_t suffix_offset = Reader::Read(stream); |
| const intptr_t to_read = remaining_length - suffix_length; |
| if (to_read > 0) { |
| for (int j = 0; j < to_read; j++) { |
| // The prefix is written from the back. |
| moves->At(moves_offset + to_read - j - 1) = |
| CatchEntryMove::ReadFrom(stream); |
| } |
| remaining_length -= to_read; |
| moves_offset += to_read; |
| } |
| offset = suffix_offset; |
| } |
| |
| return moves; |
| } |
| |
| static void FindErrorHandler(uword* handler_pc, |
| uword* handler_sp, |
| uword* handler_fp) { |
| StackFrameIterator frames(ValidationPolicy::kDontValidateFrames, |
| Thread::Current(), |
| StackFrameIterator::kNoCrossThreadIteration); |
| StackFrame* frame = frames.NextFrame(); |
| ASSERT(frame != NULL); |
| while (!frame->IsEntryFrame()) { |
| frame = frames.NextFrame(); |
| ASSERT(frame != NULL); |
| } |
| ASSERT(frame->IsEntryFrame()); |
| *handler_pc = frame->pc(); |
| *handler_sp = frame->sp(); |
| *handler_fp = frame->fp(); |
| } |
| |
| static void ClearLazyDeopts(Thread* thread, uword frame_pointer) { |
| if (thread->pending_deopts().HasPendingDeopts()) { |
| // We may be jumping over frames scheduled for lazy deopt. Remove these |
| // frames from the pending deopt table, but only after unmarking them so |
| // any stack walk that happens before the stack is unwound will still work. |
| { |
| DartFrameIterator frames(thread, |
| StackFrameIterator::kNoCrossThreadIteration); |
| for (StackFrame* frame = frames.NextFrame(); frame != nullptr; |
| frame = frames.NextFrame()) { |
| if (frame->fp() >= frame_pointer) { |
| break; |
| } |
| if (frame->IsMarkedForLazyDeopt()) { |
| frame->UnmarkForLazyDeopt(); |
| } |
| } |
| } |
| |
| #if defined(DEBUG) |
| ValidateFrames(); |
| #endif |
| |
| thread->pending_deopts().ClearPendingDeoptsBelow( |
| frame_pointer, PendingDeopts::kClearDueToThrow); |
| |
| #if defined(DEBUG) |
| ValidateFrames(); |
| #endif |
| } |
| } |
| |
| static void JumpToExceptionHandler(Thread* thread, |
| uword program_counter, |
| uword stack_pointer, |
| uword frame_pointer, |
| const Object& exception_object, |
| const Object& stacktrace_object) { |
| uword remapped_pc = thread->pending_deopts().RemapExceptionPCForDeopt( |
| program_counter, frame_pointer); |
| thread->set_active_exception(exception_object); |
| thread->set_active_stacktrace(stacktrace_object); |
| thread->set_resume_pc(remapped_pc); |
| uword run_exception_pc = StubCode::RunExceptionHandler().EntryPoint(); |
| Exceptions::JumpToFrame(thread, run_exception_pc, stack_pointer, |
| frame_pointer, false /* do not clear deopt */); |
| } |
| |
| NO_SANITIZE_SAFE_STACK // This function manipulates the safestack pointer. |
| void Exceptions::JumpToFrame(Thread* thread, |
| uword program_counter, |
| uword stack_pointer, |
| uword frame_pointer, |
| bool clear_deopt_at_target) { |
| const uword fp_for_clearing = |
| (clear_deopt_at_target ? frame_pointer + 1 : frame_pointer); |
| ClearLazyDeopts(thread, fp_for_clearing); |
| |
| #if defined(USING_SIMULATOR) |
| // Unwinding of the C++ frames and destroying of their stack resources is done |
| // by the simulator, because the target stack_pointer is a simulated stack |
| // pointer and not the C++ stack pointer. |
| |
| // Continue simulating at the given pc in the given frame after setting up the |
| // exception object in the kExceptionObjectReg register and the stacktrace |
| // object (may be raw null) in the kStackTraceObjectReg register. |
| |
| Simulator::Current()->JumpToFrame(program_counter, stack_pointer, |
| frame_pointer, thread); |
| #else |
| |
| // Prepare for unwinding frames by destroying all the stack resources |
| // in the previous frames. |
| StackResource::Unwind(thread); |
| |
| // Unpoison the stack before we tear it down in the generated stub code. |
| uword current_sp = OSThread::GetCurrentStackPointer() - 1024; |
| ASAN_UNPOISON(reinterpret_cast<void*>(current_sp), |
| stack_pointer - current_sp); |
| |
| // We are jumping over C++ frames, so we have to set the safestack pointer |
| // back to what it was when we entered the runtime from Dart code. |
| #if defined(USING_SAFE_STACK) |
| const uword saved_ssp = thread->saved_safestack_limit(); |
| OSThread::SetCurrentSafestackPointer(saved_ssp); |
| #endif |
| |
| #if defined(USING_SHADOW_CALL_STACK) |
| // The shadow call stack register will be restored by the JumpToFrame stub. |
| #endif |
| |
| #if defined(USING_THREAD_SANITIZER) |
| if (thread->exit_through_ffi() == Thread::kExitThroughRuntimeCall) { |
| auto tsan_utils = thread->tsan_utils(); |
| tsan_utils->exception_pc = program_counter; |
| tsan_utils->exception_sp = stack_pointer; |
| tsan_utils->exception_fp = frame_pointer; |
| longjmp(*(tsan_utils->setjmp_buffer), 1); |
| } |
| #endif // defined(USING_THREAD_SANITIZER) |
| |
| // Call a stub to set up the exception object in kExceptionObjectReg, |
| // to set up the stacktrace object in kStackTraceObjectReg, and to |
| // continue execution at the given pc in the given frame. |
| typedef void (*ExcpHandler)(uword, uword, uword, Thread*); |
| ExcpHandler func = |
| reinterpret_cast<ExcpHandler>(StubCode::JumpToFrame().EntryPoint()); |
| |
| if (thread->is_unwind_in_progress()) { |
| thread->SetUnwindErrorInProgress(true); |
| } |
| func(program_counter, stack_pointer, frame_pointer, thread); |
| |
| #endif |
| UNREACHABLE(); |
| } |
| |
| static FieldPtr LookupStackTraceField(const Instance& instance) { |
| if (instance.GetClassId() < kNumPredefinedCids) { |
| // 'class Error' is not a predefined class. |
| return Field::null(); |
| } |
| Thread* thread = Thread::Current(); |
| Zone* zone = thread->zone(); |
| auto isolate_group = thread->isolate_group(); |
| const auto& error_class = |
| Class::Handle(zone, isolate_group->object_store()->error_class()); |
| // If instance class extends 'class Error' return '_stackTrace' field. |
| Class& test_class = Class::Handle(zone, instance.clazz()); |
| AbstractType& type = AbstractType::Handle(zone, AbstractType::null()); |
| while (true) { |
| if (test_class.ptr() == error_class.ptr()) { |
| return error_class.LookupInstanceFieldAllowPrivate( |
| Symbols::_stackTrace()); |
| } |
| type = test_class.super_type(); |
| if (type.IsNull()) return Field::null(); |
| test_class = type.type_class(); |
| } |
| UNREACHABLE(); |
| return Field::null(); |
| } |
| |
| StackTracePtr Exceptions::CurrentStackTrace() { |
| return GetStackTraceForException(); |
| } |
| |
| DART_NORETURN |
| static void ThrowExceptionHelper(Thread* thread, |
| const Instance& incoming_exception, |
| const Instance& existing_stacktrace, |
| const bool is_rethrow) { |
| // SuspendLongJumpScope during Dart entry ensures that if a longjmp base is |
| // available, it is the innermost error handler. If one is available, so |
| // should jump there instead. |
| RELEASE_ASSERT(thread->long_jump_base() == nullptr); |
| Zone* zone = thread->zone(); |
| auto object_store = thread->isolate_group()->object_store(); |
| Isolate* isolate = thread->isolate(); |
| #if !defined(PRODUCT) |
| // Do not notify debugger on stack overflow and out of memory exceptions. |
| // The VM would crash when the debugger calls back into the VM to |
| // get values of variables. |
| if (incoming_exception.ptr() != object_store->out_of_memory() && |
| incoming_exception.ptr() != object_store->stack_overflow()) { |
| isolate->debugger()->PauseException(incoming_exception); |
| } |
| #endif |
| bool use_preallocated_stacktrace = false; |
| Instance& exception = Instance::Handle(zone, incoming_exception.ptr()); |
| if (exception.IsNull()) { |
| exception ^= |
| Exceptions::Create(Exceptions::kNullThrown, Object::empty_array()); |
| } else if (existing_stacktrace.IsNull() && |
| (exception.ptr() == object_store->out_of_memory() || |
| exception.ptr() == object_store->stack_overflow())) { |
| use_preallocated_stacktrace = true; |
| } |
| // Find the exception handler and determine if the handler needs a |
| // stacktrace. |
| ExceptionHandlerFinder finder(thread); |
| bool handler_exists = finder.Find(); |
| uword handler_pc = finder.handler_pc; |
| uword handler_sp = finder.handler_sp; |
| uword handler_fp = finder.handler_fp; |
| bool handler_needs_stacktrace = finder.needs_stacktrace; |
| Instance& stacktrace = Instance::Handle(zone); |
| if (use_preallocated_stacktrace) { |
| if (handler_pc == 0) { |
| // No Dart frame. |
| ASSERT(incoming_exception.ptr() == object_store->out_of_memory()); |
| const UnhandledException& error = UnhandledException::Handle( |
| zone, |
| isolate->isolate_object_store()->preallocated_unhandled_exception()); |
| thread->long_jump_base()->Jump(1, error); |
| UNREACHABLE(); |
| } |
| stacktrace = isolate->isolate_object_store()->preallocated_stack_trace(); |
| PreallocatedStackTraceBuilder frame_builder(stacktrace); |
| ASSERT(existing_stacktrace.IsNull() || |
| (existing_stacktrace.ptr() == stacktrace.ptr())); |
| ASSERT(existing_stacktrace.IsNull() || is_rethrow); |
| if (handler_needs_stacktrace && existing_stacktrace.IsNull()) { |
| BuildStackTrace(&frame_builder); |
| } |
| } else { |
| if (!existing_stacktrace.IsNull()) { |
| stacktrace = existing_stacktrace.ptr(); |
| // If this is not a rethrow, it's a "throw with stacktrace". |
| // Set an Error object's stackTrace field if needed. |
| if (!is_rethrow) { |
| const Field& stacktrace_field = |
| Field::Handle(zone, LookupStackTraceField(exception)); |
| if (!stacktrace_field.IsNull() && |
| (exception.GetField(stacktrace_field) == Object::null())) { |
| exception.SetField(stacktrace_field, stacktrace); |
| } |
| } |
| } else { |
| // Get stacktrace field of class Error to determine whether we have a |
| // subclass of Error which carries around its stack trace. |
| const Field& stacktrace_field = |
| Field::Handle(zone, LookupStackTraceField(exception)); |
| if (!stacktrace_field.IsNull() || handler_needs_stacktrace) { |
| // Collect the stacktrace if needed. |
| ASSERT(existing_stacktrace.IsNull()); |
| stacktrace = Exceptions::CurrentStackTrace(); |
| // If we have an Error object, then set its stackTrace field only if it |
| // not yet initialized. |
| if (!stacktrace_field.IsNull() && |
| (exception.GetField(stacktrace_field) == Object::null())) { |
| exception.SetField(stacktrace_field, stacktrace); |
| } |
| } |
| } |
| } |
| // We expect to find a handler_pc, if the exception is unhandled |
| // then we expect to at least have the dart entry frame on the |
| // stack as Exceptions::Throw should happen only after a dart |
| // invocation has been done. |
| ASSERT(handler_pc != 0); |
| |
| if (FLAG_print_stacktrace_at_throw) { |
| THR_Print("Exception '%s' thrown:\n", exception.ToCString()); |
| THR_Print("%s\n", stacktrace.ToCString()); |
| } |
| if (handler_exists) { |
| finder.PrepareFrameForCatchEntry(); |
| // Found a dart handler for the exception, jump to it. |
| JumpToExceptionHandler(thread, handler_pc, handler_sp, handler_fp, |
| exception, stacktrace); |
| } else { |
| // No dart exception handler found in this invocation sequence, |
| // so we create an unhandled exception object and return to the |
| // invocation stub so that it returns this unhandled exception |
| // object. The C++ code which invoked this dart sequence can check |
| // and do the appropriate thing (rethrow the exception to the |
| // dart invocation sequence above it, print diagnostics and terminate |
| // the isolate etc.). This can happen in the compiler, which is not |
| // allowed to allocate in new space, so we pass the kOld argument. |
| const UnhandledException& unhandled_exception = UnhandledException::Handle( |
| zone, exception.ptr() == object_store->out_of_memory() |
| ? isolate->isolate_object_store() |
| ->preallocated_unhandled_exception() |
| : UnhandledException::New(exception, stacktrace, Heap::kOld)); |
| stacktrace = StackTrace::null(); |
| JumpToExceptionHandler(thread, handler_pc, handler_sp, handler_fp, |
| unhandled_exception, stacktrace); |
| } |
| UNREACHABLE(); |
| } |
| |
| // Static helpers for allocating, initializing, and throwing an error instance. |
| |
| // Return the script of the Dart function that called the native entry or the |
| // runtime entry. The frame iterator points to the callee. |
| ScriptPtr Exceptions::GetCallerScript(DartFrameIterator* iterator) { |
| StackFrame* caller_frame = iterator->NextFrame(); |
| ASSERT(caller_frame != NULL && caller_frame->IsDartFrame()); |
| const Function& caller = Function::Handle(caller_frame->LookupDartFunction()); |
| #if defined(DART_PRECOMPILED_RUNTIME) |
| if (caller.IsNull()) return Script::null(); |
| #else |
| ASSERT(!caller.IsNull()); |
| #endif |
| return caller.script(); |
| } |
| |
| // Allocate a new instance of the given class name. |
| // TODO(hausner): Rename this NewCoreInstance to call out the fact that |
| // the class name is resolved in the core library implicitly? |
| InstancePtr Exceptions::NewInstance(const char* class_name) { |
| Thread* thread = Thread::Current(); |
| Zone* zone = thread->zone(); |
| const String& cls_name = |
| String::Handle(zone, Symbols::New(thread, class_name)); |
| const Library& core_lib = Library::Handle(Library::CoreLibrary()); |
| // No ambiguity error expected: passing NULL. |
| Class& cls = Class::Handle(core_lib.LookupClass(cls_name)); |
| ASSERT(!cls.IsNull()); |
| // There are no parameterized error types, so no need to set type arguments. |
| return Instance::New(cls); |
| } |
| |
| // Allocate, initialize, and throw a TypeError or CastError. |
| // If error_msg is not null, throw a TypeError, even for a type cast. |
| void Exceptions::CreateAndThrowTypeError(TokenPosition location, |
| const AbstractType& src_type, |
| const AbstractType& dst_type, |
| const String& dst_name) { |
| ASSERT(!dst_name.IsNull()); // Pass Symbols::Empty() instead. |
| Thread* thread = Thread::Current(); |
| Zone* zone = thread->zone(); |
| const Array& args = Array::Handle(zone, Array::New(4)); |
| |
| ExceptionType exception_type = |
| (dst_name.ptr() == Symbols::InTypeCast().ptr()) ? kCast : kType; |
| |
| DartFrameIterator iterator(thread, |
| StackFrameIterator::kNoCrossThreadIteration); |
| const Script& script = Script::Handle(zone, GetCallerScript(&iterator)); |
| const String& url = String::Handle( |
| zone, script.IsNull() ? Symbols::OptimizedOut().ptr() : script.url()); |
| intptr_t line = -1; |
| intptr_t column = -1; |
| if (!script.IsNull()) { |
| script.GetTokenLocation(location, &line, &column); |
| } |
| // Initialize '_url', '_line', and '_column' arguments. |
| args.SetAt(0, url); |
| args.SetAt(1, Smi::Handle(zone, Smi::New(line))); |
| args.SetAt(2, Smi::Handle(zone, Smi::New(column))); |
| |
| // Construct '_errorMsg'. |
| const GrowableObjectArray& pieces = |
| GrowableObjectArray::Handle(zone, GrowableObjectArray::New(20)); |
| |
| if (!dst_type.IsNull()) { |
| // Describe the type error. |
| if (!src_type.IsNull()) { |
| pieces.Add(Symbols::TypeQuote()); |
| pieces.Add(String::Handle(zone, src_type.UserVisibleName())); |
| pieces.Add(Symbols::QuoteIsNotASubtypeOf()); |
| } |
| pieces.Add(Symbols::TypeQuote()); |
| pieces.Add(String::Handle(zone, dst_type.UserVisibleName())); |
| pieces.Add(Symbols::SingleQuote()); |
| if (exception_type == kCast) { |
| pieces.Add(dst_name); |
| } else if (dst_name.Length() > 0) { |
| pieces.Add(Symbols::SpaceOfSpace()); |
| pieces.Add(Symbols::SingleQuote()); |
| pieces.Add(dst_name); |
| pieces.Add(Symbols::SingleQuote()); |
| } |
| // Print ambiguous URIs of src and dst types. |
| URIs uris(zone, 12); |
| if (!src_type.IsNull()) { |
| src_type.EnumerateURIs(&uris); |
| } |
| if (!dst_type.IsDynamicType() && !dst_type.IsVoidType() && |
| !dst_type.IsNeverType()) { |
| dst_type.EnumerateURIs(&uris); |
| } |
| const String& formatted_uris = |
| String::Handle(zone, AbstractType::PrintURIs(&uris)); |
| if (formatted_uris.Length() > 0) { |
| pieces.Add(Symbols::SpaceWhereNewLine()); |
| pieces.Add(formatted_uris); |
| } |
| } |
| const Array& arr = Array::Handle(zone, Array::MakeFixedLength(pieces)); |
| const String& error_msg = String::Handle(zone, String::ConcatAll(arr)); |
| args.SetAt(3, error_msg); |
| |
| // Type errors in the core library may be difficult to diagnose. |
| // Print type error information before throwing the error when debugging. |
| if (FLAG_print_stacktrace_at_throw) { |
| THR_Print("'%s': Failed type check: line %" Pd " pos %" Pd ": ", |
| String::Handle(zone, script.url()).ToCString(), line, column); |
| THR_Print("%s\n", error_msg.ToCString()); |
| } |
| |
| // Throw TypeError or CastError instance. |
| Exceptions::ThrowByType(exception_type, args); |
| UNREACHABLE(); |
| } |
| |
| void Exceptions::Throw(Thread* thread, const Instance& exception) { |
| // Null object is a valid exception object. |
| ThrowExceptionHelper(thread, exception, StackTrace::Handle(thread->zone()), |
| false); |
| } |
| |
| void Exceptions::ReThrow(Thread* thread, |
| const Instance& exception, |
| const Instance& stacktrace) { |
| // Null object is a valid exception object. |
| ThrowExceptionHelper(thread, exception, stacktrace, true); |
| } |
| |
| void Exceptions::ThrowWithStackTrace(Thread* thread, |
| const Instance& exception, |
| const Instance& stacktrace) { |
| // Null object is a valid exception object. |
| ThrowExceptionHelper(thread, exception, stacktrace, false); |
| } |
| |
| void Exceptions::PropagateError(const Error& error) { |
| ASSERT(!error.IsNull()); |
| Thread* thread = Thread::Current(); |
| // SuspendLongJumpScope during Dart entry ensures that if a longjmp base is |
| // available, it is the innermost error handler. If one is available, so |
| // should jump there instead. |
| RELEASE_ASSERT(thread->long_jump_base() == nullptr); |
| Zone* zone = thread->zone(); |
| if (error.IsUnhandledException()) { |
| // If the error object represents an unhandled exception, then |
| // rethrow the exception in the normal fashion. |
| const UnhandledException& uhe = UnhandledException::Cast(error); |
| const Instance& exc = Instance::Handle(zone, uhe.exception()); |
| const Instance& stk = Instance::Handle(zone, uhe.stacktrace()); |
| Exceptions::ReThrow(thread, exc, stk); |
| } else { |
| // Return to the invocation stub and return this error object. The |
| // C++ code which invoked this dart sequence can check and do the |
| // appropriate thing. |
| uword handler_pc = 0; |
| uword handler_sp = 0; |
| uword handler_fp = 0; |
| FindErrorHandler(&handler_pc, &handler_sp, &handler_fp); |
| JumpToExceptionHandler(thread, handler_pc, handler_sp, handler_fp, error, |
| StackTrace::Handle(zone)); // Null stacktrace. |
| } |
| UNREACHABLE(); |
| } |
| |
| void Exceptions::PropagateToEntry(const Error& error) { |
| Thread* thread = Thread::Current(); |
| Zone* zone = thread->zone(); |
| ASSERT(thread->top_exit_frame_info() != 0); |
| Instance& stacktrace = Instance::Handle(zone); |
| if (error.IsUnhandledException()) { |
| const UnhandledException& uhe = UnhandledException::Cast(error); |
| stacktrace = uhe.stacktrace(); |
| } else { |
| stacktrace = Exceptions::CurrentStackTrace(); |
| } |
| uword handler_pc = 0; |
| uword handler_sp = 0; |
| uword handler_fp = 0; |
| FindErrorHandler(&handler_pc, &handler_sp, &handler_fp); |
| JumpToExceptionHandler(thread, handler_pc, handler_sp, handler_fp, error, |
| stacktrace); |
| UNREACHABLE(); |
| } |
| |
| void Exceptions::ThrowByType(ExceptionType type, const Array& arguments) { |
| Thread* thread = Thread::Current(); |
| const Object& result = |
| Object::Handle(thread->zone(), Create(type, arguments)); |
| if (result.IsError()) { |
| // We got an error while constructing the exception object. |
| // Propagate the error instead of throwing the exception. |
| PropagateError(Error::Cast(result)); |
| } else { |
| ASSERT(result.IsInstance()); |
| Throw(thread, Instance::Cast(result)); |
| } |
| } |
| |
| void Exceptions::ThrowOOM() { |
| auto thread = Thread::Current(); |
| auto isolate_group = thread->isolate_group(); |
| const Instance& oom = Instance::Handle( |
| thread->zone(), isolate_group->object_store()->out_of_memory()); |
| Throw(thread, oom); |
| } |
| |
| void Exceptions::ThrowStackOverflow() { |
| auto thread = Thread::Current(); |
| auto isolate_group = thread->isolate_group(); |
| const Instance& stack_overflow = Instance::Handle( |
| thread->zone(), isolate_group->object_store()->stack_overflow()); |
| Throw(thread, stack_overflow); |
| } |
| |
| void Exceptions::ThrowArgumentError(const Instance& arg) { |
| const Array& args = Array::Handle(Array::New(1)); |
| args.SetAt(0, arg); |
| Exceptions::ThrowByType(Exceptions::kArgument, args); |
| } |
| |
| void Exceptions::ThrowRangeError(const char* argument_name, |
| const Integer& argument_value, |
| intptr_t expected_from, |
| intptr_t expected_to) { |
| const Array& args = Array::Handle(Array::New(4)); |
| args.SetAt(0, argument_value); |
| args.SetAt(1, Integer::Handle(Integer::New(expected_from))); |
| args.SetAt(2, Integer::Handle(Integer::New(expected_to))); |
| args.SetAt(3, String::Handle(String::New(argument_name))); |
| Exceptions::ThrowByType(Exceptions::kRange, args); |
| } |
| |
| void Exceptions::ThrowUnsupportedError(const char* msg) { |
| const Array& args = Array::Handle(Array::New(1)); |
| args.SetAt(0, String::Handle(String::New(msg))); |
| Exceptions::ThrowByType(Exceptions::kUnsupported, args); |
| } |
| |
| void Exceptions::ThrowCompileTimeError(const LanguageError& error) { |
| const Array& args = Array::Handle(Array::New(1)); |
| args.SetAt(0, String::Handle(error.FormatMessage())); |
| Exceptions::ThrowByType(Exceptions::kCompileTimeError, args); |
| } |
| |
| void Exceptions::ThrowLateFieldNotInitialized(const String& name) { |
| const Array& args = Array::Handle(Array::New(1)); |
| args.SetAt(0, name); |
| Exceptions::ThrowByType(Exceptions::kLateFieldNotInitialized, args); |
| } |
| |
| void Exceptions::ThrowLateFieldAssignedDuringInitialization( |
| const String& name) { |
| const Array& args = Array::Handle(Array::New(1)); |
| args.SetAt(0, name); |
| Exceptions::ThrowByType(Exceptions::kLateFieldAssignedDuringInitialization, |
| args); |
| } |
| |
| ObjectPtr Exceptions::Create(ExceptionType type, const Array& arguments) { |
| Library& library = Library::Handle(); |
| const String* class_name = NULL; |
| const String* constructor_name = &Symbols::Dot(); |
| switch (type) { |
| case kNone: |
| case kStackOverflow: |
| case kOutOfMemory: |
| UNREACHABLE(); |
| break; |
| case kRange: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::RangeError(); |
| constructor_name = &Symbols::DotRange(); |
| break; |
| case kRangeMsg: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::RangeError(); |
| constructor_name = &Symbols::Dot(); |
| break; |
| case kArgument: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::ArgumentError(); |
| break; |
| case kArgumentValue: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::ArgumentError(); |
| constructor_name = &Symbols::DotValue(); |
| break; |
| case kIntegerDivisionByZeroException: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::IntegerDivisionByZeroException(); |
| break; |
| case kNoSuchMethod: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::NoSuchMethodError(); |
| constructor_name = &Symbols::DotWithType(); |
| break; |
| case kFormat: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::FormatException(); |
| break; |
| case kUnsupported: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::UnsupportedError(); |
| break; |
| case kNullThrown: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::NullThrownError(); |
| break; |
| case kIsolateSpawn: |
| library = Library::IsolateLibrary(); |
| class_name = &Symbols::IsolateSpawnException(); |
| break; |
| case kAssertion: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::AssertionError(); |
| constructor_name = &Symbols::DotCreate(); |
| break; |
| case kCast: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::CastError(); |
| constructor_name = &Symbols::DotCreate(); |
| break; |
| case kType: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::TypeError(); |
| constructor_name = &Symbols::DotCreate(); |
| break; |
| case kFallThrough: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::FallThroughError(); |
| constructor_name = &Symbols::DotCreate(); |
| break; |
| case kAbstractClassInstantiation: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::AbstractClassInstantiationError(); |
| constructor_name = &Symbols::DotCreate(); |
| break; |
| case kCyclicInitializationError: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::CyclicInitializationError(); |
| break; |
| case kCompileTimeError: |
| library = Library::CoreLibrary(); |
| class_name = &Symbols::_CompileTimeError(); |
| break; |
| case kLateFieldAssignedDuringInitialization: |
| library = Library::InternalLibrary(); |
| class_name = &Symbols::LateError(); |
| constructor_name = &Symbols::DotFieldADI(); |
| break; |
| case kLateFieldNotInitialized: |
| library = Library::InternalLibrary(); |
| class_name = &Symbols::LateError(); |
| constructor_name = &Symbols::DotFieldNI(); |
| break; |
| } |
| |
| return DartLibraryCalls::InstanceCreate(library, *class_name, |
| *constructor_name, arguments); |
| } |
| |
| UnhandledExceptionPtr Exceptions::CreateUnhandledException(Zone* zone, |
| ExceptionType type, |
| const char* msg) { |
| const String& error_str = String::Handle(zone, String::New(msg)); |
| const Array& args = Array::Handle(zone, Array::New(1)); |
| args.SetAt(0, error_str); |
| |
| Object& result = Object::Handle(zone, Exceptions::Create(type, args)); |
| const StackTrace& stacktrace = StackTrace::Handle(zone); |
| return UnhandledException::New(Instance::Cast(result), stacktrace); |
| } |
| |
| } // namespace dart |
