mirror of
https://github.com/dart-lang/sdk
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111 lines
4.2 KiB
C++
111 lines
4.2 KiB
C++
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/stack_trace.h"
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#include "vm/stack_frame.h"
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namespace dart {
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// Count the number of frames that are on the stack.
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intptr_t StackTraceUtils::CountFrames(Thread* thread,
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int skip_frames,
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const Function& async_function) {
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Zone* zone = thread->zone();
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intptr_t frame_count = 0;
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StackFrameIterator frames(StackFrameIterator::kDontValidateFrames, thread,
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StackFrameIterator::kNoCrossThreadIteration);
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StackFrame* frame = frames.NextFrame();
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ASSERT(frame != NULL); // We expect to find a dart invocation frame.
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Code& code = Code::Handle(zone);
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Function& function = Function::Handle(zone);
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const bool async_function_is_null = async_function.IsNull();
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while (frame != NULL) {
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if (frame->IsDartFrame()) {
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if (skip_frames > 0) {
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skip_frames--;
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} else {
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code = frame->LookupDartCode();
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function = code.function();
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frame_count++;
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if (!async_function_is_null &&
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(async_function.raw() == function.parent_function())) {
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return frame_count;
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}
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}
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}
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frame = frames.NextFrame();
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}
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// We hit the sentinel.
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ASSERT(async_function_is_null);
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return frame_count;
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}
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intptr_t StackTraceUtils::CollectFrames(Thread* thread,
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const Array& code_array,
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const Array& pc_offset_array,
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intptr_t array_offset,
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intptr_t count,
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int skip_frames) {
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Zone* zone = thread->zone();
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StackFrameIterator frames(StackFrameIterator::kDontValidateFrames, thread,
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StackFrameIterator::kNoCrossThreadIteration);
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StackFrame* frame = frames.NextFrame();
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ASSERT(frame != NULL); // We expect to find a dart invocation frame.
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Function& function = Function::Handle(zone);
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Code& code = Code::Handle(zone);
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Smi& offset = Smi::Handle(zone);
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intptr_t collected_frames_count = 0;
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while ((frame != NULL) && (collected_frames_count < count)) {
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if (frame->IsDartFrame()) {
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if (skip_frames > 0) {
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skip_frames--;
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} else {
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code = frame->LookupDartCode();
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function = code.function();
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offset = Smi::New(frame->pc() - code.PayloadStart());
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code_array.SetAt(array_offset, code);
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pc_offset_array.SetAt(array_offset, offset);
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array_offset++;
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collected_frames_count++;
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}
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}
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frame = frames.NextFrame();
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}
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return collected_frames_count;
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}
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intptr_t StackTraceUtils::ExtractAsyncStackTraceInfo(
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Thread* thread,
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Function* async_function,
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StackTrace* async_stack_trace_out,
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Array* async_code_array,
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Array* async_pc_offset_array) {
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if (thread->async_stack_trace() == StackTrace::null()) {
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return 0;
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}
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*async_stack_trace_out = thread->async_stack_trace();
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ASSERT(!async_stack_trace_out->IsNull());
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const StackTrace& async_stack_trace =
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StackTrace::Handle(thread->async_stack_trace());
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const intptr_t async_stack_trace_length = async_stack_trace.Length();
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// At least two entries (0: gap marker, 1: async function).
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ASSERT(async_stack_trace_length >= 2);
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// Validate the structure of this stack trace.
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*async_code_array = async_stack_trace.code_array();
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ASSERT(!async_code_array->IsNull());
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*async_pc_offset_array = async_stack_trace.pc_offset_array();
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ASSERT(!async_pc_offset_array->IsNull());
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// We start with the asynchronous gap marker.
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ASSERT(async_code_array->At(0) != Code::null());
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ASSERT(async_code_array->At(0) ==
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StubCode::AsynchronousGapMarker_entry()->code());
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const Code& code = Code::Handle(Code::RawCast(async_code_array->At(1)));
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*async_function = code.function();
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ASSERT(!async_function->IsNull());
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ASSERT(async_function->IsAsyncFunction() ||
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async_function->IsAsyncGenerator());
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return async_stack_trace_length;
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}
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} // namespace dart
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