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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "lib/stacktrace.h"
#include "vm/bootstrap_natives.h"
#include "vm/debugger.h"
#include "vm/exceptions.h"
#include "vm/native_entry.h"
#include "vm/object_store.h"
#include "vm/runtime_entry.h"
#include "vm/stack_frame.h"
#include "vm/stack_trace.h"
namespace dart {
DECLARE_FLAG(bool, show_invisible_frames);
static constexpr intptr_t kDefaultStackAllocation = 8;
static StackTracePtr CreateStackTraceObject(
Zone* zone,
const GrowableObjectArray& code_list,
const GrowableArray<uword>& pc_offset_list) {
const auto& code_array =
Array::Handle(zone, Array::MakeFixedLength(code_list));
const auto& pc_offset_array = TypedData::Handle(
zone, TypedData::New(kUintPtrCid, pc_offset_list.length()));
{
NoSafepointScope no_safepoint;
memmove(pc_offset_array.DataAddr(0), pc_offset_list.data(),
pc_offset_list.length() * kWordSize);
}
return StackTrace::New(code_array, pc_offset_array);
}
// Gets current stack trace for `thread`.
static StackTracePtr CurrentStackTrace(Thread* thread,
intptr_t skip_frames = 1) {
Zone* zone = thread->zone();
const auto& code_array = GrowableObjectArray::ZoneHandle(
zone, GrowableObjectArray::New(kDefaultStackAllocation));
GrowableArray<uword> pc_offset_array(kDefaultStackAllocation);
// Collect the frames.
StackTraceUtils::CollectFrames(thread, skip_frames,
[&](const StackTraceUtils::Frame& frame) {
if (!frame.bytecode.IsNull()) {
code_array.Add(frame.bytecode);
} else {
code_array.Add(frame.code);
}
pc_offset_array.Add(frame.pc_offset);
});
return CreateStackTraceObject(zone, code_array, pc_offset_array);
}
StackTracePtr GetStackTraceForException() {
Thread* thread = Thread::Current();
return CurrentStackTrace(thread, 0);
}
DEFINE_NATIVE_ENTRY(StackTrace_current, 0, 0) {
return CurrentStackTrace(thread);
}
static void AppendFrames(const GrowableObjectArray& code_list,
GrowableArray<uword>* pc_offset_list,
int skip_frames) {
Thread* thread = Thread::Current();
Zone* zone = thread->zone();
StackFrameIterator frames(ValidationPolicy::kDontValidateFrames, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = frames.NextFrame();
ASSERT(frame != nullptr); // We expect to find a dart invocation frame.
Code& code = Code::Handle(zone);
Bytecode& bytecode = Bytecode::Handle(zone);
for (; frame != nullptr; frame = frames.NextFrame()) {
if (!frame->IsDartFrame()) {
continue;
}
if (skip_frames > 0) {
skip_frames--;
continue;
}
if (frame->is_interpreted()) {
bytecode = frame->LookupDartBytecode();
if (bytecode.function() == Function::null()) {
continue;
}
const intptr_t pc_offset = frame->pc() - bytecode.PayloadStart();
code_list.Add(bytecode);
pc_offset_list->Add(pc_offset);
} else {
code = frame->LookupDartCode();
const intptr_t pc_offset = frame->pc() - code.PayloadStart();
code_list.Add(code);
pc_offset_list->Add(pc_offset);
}
}
}
// Creates a StackTrace object from the current stack.
//
// Skips the first skip_frames Dart frames.
const StackTrace& GetCurrentStackTrace(int skip_frames) {
Zone* zone = Thread::Current()->zone();
const GrowableObjectArray& code_list =
GrowableObjectArray::Handle(zone, GrowableObjectArray::New());
GrowableArray<uword> pc_offset_list;
AppendFrames(code_list, &pc_offset_list, skip_frames);
const StackTrace& stacktrace = StackTrace::Handle(
zone, CreateStackTraceObject(zone, code_list, pc_offset_list));
return stacktrace;
}
bool HasStack() {
Thread* thread = Thread::Current();
StackFrameIterator frames(ValidationPolicy::kDontValidateFrames, thread,
StackFrameIterator::kNoCrossThreadIteration);
StackFrame* frame = frames.NextFrame();
return frame != nullptr;
}
} // namespace dart