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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/objects/debug-objects.h"
#include "src/base/platform/mutex.h"
#include "src/debug/debug-evaluate.h"
#include "src/handles/handles-inl.h"
#include "src/objects/debug-objects-inl.h"
#include "src/utils/ostreams.h"
namespace v8 {
namespace internal {
bool DebugInfo::IsEmpty() const {
return flags(kRelaxedLoad) == kNone && debugger_hints() == 0;
}
bool DebugInfo::HasBreakInfo() const {
return (flags(kRelaxedLoad) & kHasBreakInfo) != 0;
}
DebugInfo::ExecutionMode DebugInfo::DebugExecutionMode() const {
return (flags(kRelaxedLoad) & kDebugExecutionMode) != 0 ? kSideEffects
: kBreakpoints;
}
void DebugInfo::SetDebugExecutionMode(ExecutionMode value) {
set_flags(value == kSideEffects
? (flags(kRelaxedLoad) | kDebugExecutionMode)
: (flags(kRelaxedLoad) & ~kDebugExecutionMode),
kRelaxedStore);
}
void DebugInfo::ClearBreakInfo(Isolate* isolate) {
if (HasInstrumentedBytecodeArray()) {
// If the function is currently running on the stack, we need to update the
// bytecode pointers on the stack so they point to the original
// BytecodeArray before releasing that BytecodeArray from this DebugInfo.
// Otherwise, it could be flushed and cause problems on resume. See v8:9067.
{
RedirectActiveFunctions redirect_visitor(
shared(), RedirectActiveFunctions::Mode::kUseOriginalBytecode);
redirect_visitor.VisitThread(isolate, isolate->thread_local_top());
isolate->thread_manager()->IterateArchivedThreads(&redirect_visitor);
}
SharedFunctionInfo::UninstallDebugBytecode(shared(), isolate);
}
set_break_points(ReadOnlyRoots(isolate).empty_fixed_array());
int new_flags = flags(kRelaxedLoad);
new_flags &= ~kHasBreakInfo & ~kPreparedForDebugExecution;
new_flags &= ~kBreakAtEntry & ~kCanBreakAtEntry;
new_flags &= ~kDebugExecutionMode;
set_flags(new_flags, kRelaxedStore);
}
void DebugInfo::SetBreakAtEntry() {
DCHECK(CanBreakAtEntry());
set_flags(flags(kRelaxedLoad) | kBreakAtEntry, kRelaxedStore);
}
void DebugInfo::ClearBreakAtEntry() {
DCHECK(CanBreakAtEntry());
set_flags(flags(kRelaxedLoad) & ~kBreakAtEntry, kRelaxedStore);
}
bool DebugInfo::BreakAtEntry() const {
return (flags(kRelaxedLoad) & kBreakAtEntry) != 0;
}
bool DebugInfo::CanBreakAtEntry() const {
return (flags(kRelaxedLoad) & kCanBreakAtEntry) != 0;
}
// Check if there is a break point at this source position.
bool DebugInfo::HasBreakPoint(Isolate* isolate, int source_position) {
DCHECK(HasBreakInfo());
// Get the break point info object for this code offset.
Object break_point_info = GetBreakPointInfo(isolate, source_position);
// If there is no break point info object or no break points in the break
// point info object there is no break point at this code offset.
if (break_point_info.IsUndefined(isolate)) return false;
return BreakPointInfo::cast(break_point_info).GetBreakPointCount(isolate) > 0;
}
// Get the break point info object for this source position.
Object DebugInfo::GetBreakPointInfo(Isolate* isolate, int source_position) {
DCHECK(HasBreakInfo());
for (int i = 0; i < break_points().length(); i++) {
if (!break_points().get(i).IsUndefined(isolate)) {
BreakPointInfo break_point_info =
BreakPointInfo::cast(break_points().get(i));
if (break_point_info.source_position() == source_position) {
return break_point_info;
}
}
}
return ReadOnlyRoots(isolate).undefined_value();
}
bool DebugInfo::ClearBreakPoint(Isolate* isolate, Handle<DebugInfo> debug_info,
Handle<BreakPoint> break_point) {
DCHECK(debug_info->HasBreakInfo());
for (int i = 0; i < debug_info->break_points().length(); i++) {
if (debug_info->break_points().get(i).IsUndefined(isolate)) continue;
Handle<BreakPointInfo> break_point_info = Handle<BreakPointInfo>(
BreakPointInfo::cast(debug_info->break_points().get(i)), isolate);
if (BreakPointInfo::HasBreakPoint(isolate, break_point_info, break_point)) {
BreakPointInfo::ClearBreakPoint(isolate, break_point_info, break_point);
return true;
}
}
return false;
}
void DebugInfo::SetBreakPoint(Isolate* isolate, Handle<DebugInfo> debug_info,
int source_position,
Handle<BreakPoint> break_point) {
DCHECK(debug_info->HasBreakInfo());
Handle<Object> break_point_info(
debug_info->GetBreakPointInfo(isolate, source_position), isolate);
if (!break_point_info->IsUndefined(isolate)) {
BreakPointInfo::SetBreakPoint(
isolate, Handle<BreakPointInfo>::cast(break_point_info), break_point);
return;
}
// Adding a new break point for a code offset which did not have any
// break points before. Try to find a free slot.
static const int kNoBreakPointInfo = -1;
int index = kNoBreakPointInfo;
for (int i = 0; i < debug_info->break_points().length(); i++) {
if (debug_info->break_points().get(i).IsUndefined(isolate)) {
index = i;
break;
}
}
if (index == kNoBreakPointInfo) {
// No free slot - extend break point info array.
Handle<FixedArray> old_break_points =
Handle<FixedArray>(debug_info->break_points(), isolate);
Handle<FixedArray> new_break_points = isolate->factory()->NewFixedArray(
old_break_points->length() +
DebugInfo::kEstimatedNofBreakPointsInFunction);
debug_info->set_break_points(*new_break_points);
for (int i = 0; i < old_break_points->length(); i++) {
new_break_points->set(i, old_break_points->get(i));
}
index = old_break_points->length();
}
DCHECK_NE(index, kNoBreakPointInfo);
// Allocate new BreakPointInfo object and set the break point.
Handle<BreakPointInfo> new_break_point_info =
isolate->factory()->NewBreakPointInfo(source_position);
BreakPointInfo::SetBreakPoint(isolate, new_break_point_info, break_point);
debug_info->break_points().set(index, *new_break_point_info);
}
// Get the break point objects for a source position.
Handle<Object> DebugInfo::GetBreakPoints(Isolate* isolate,
int source_position) {
DCHECK(HasBreakInfo());
Object break_point_info = GetBreakPointInfo(isolate, source_position);
if (break_point_info.IsUndefined(isolate)) {
return isolate->factory()->undefined_value();
}
return Handle<Object>(BreakPointInfo::cast(break_point_info).break_points(),
isolate);
}
// Get the total number of break points.
int DebugInfo::GetBreakPointCount(Isolate* isolate) {
DCHECK(HasBreakInfo());
int count = 0;
for (int i = 0; i < break_points().length(); i++) {
if (!break_points().get(i).IsUndefined(isolate)) {
BreakPointInfo break_point_info =
BreakPointInfo::cast(break_points().get(i));
count += break_point_info.GetBreakPointCount(isolate);
}
}
return count;
}
Handle<Object> DebugInfo::FindBreakPointInfo(Isolate* isolate,
Handle<DebugInfo> debug_info,
Handle<BreakPoint> break_point) {
DCHECK(debug_info->HasBreakInfo());
for (int i = 0; i < debug_info->break_points().length(); i++) {
if (!debug_info->break_points().get(i).IsUndefined(isolate)) {
Handle<BreakPointInfo> break_point_info = Handle<BreakPointInfo>(
BreakPointInfo::cast(debug_info->break_points().get(i)), isolate);
if (BreakPointInfo::HasBreakPoint(isolate, break_point_info,
break_point)) {
return break_point_info;
}
}
}
return isolate->factory()->undefined_value();
}
bool DebugInfo::HasCoverageInfo() const {
return (flags(kRelaxedLoad) & kHasCoverageInfo) != 0;
}
void DebugInfo::ClearCoverageInfo(Isolate* isolate) {
if (HasCoverageInfo()) {
set_coverage_info(ReadOnlyRoots(isolate).undefined_value());
int new_flags = flags(kRelaxedLoad) & ~kHasCoverageInfo;
set_flags(new_flags, kRelaxedStore);
}
}
DebugInfo::SideEffectState DebugInfo::GetSideEffectState(Isolate* isolate) {
if (side_effect_state() == kNotComputed) {
SideEffectState has_no_side_effect =
DebugEvaluate::FunctionGetSideEffectState(isolate,
handle(shared(), isolate));
set_side_effect_state(has_no_side_effect);
}
return static_cast<SideEffectState>(side_effect_state());
}
namespace {
bool IsEqual(BreakPoint break_point1, BreakPoint break_point2) {
return break_point1.id() == break_point2.id();
}
} // namespace
// Remove the specified break point object.
void BreakPointInfo::ClearBreakPoint(Isolate* isolate,
Handle<BreakPointInfo> break_point_info,
Handle<BreakPoint> break_point) {
// If there are no break points just ignore.
if (break_point_info->break_points().IsUndefined(isolate)) return;
// If there is a single break point clear it if it is the same.
if (!break_point_info->break_points().IsFixedArray()) {
if (IsEqual(BreakPoint::cast(break_point_info->break_points()),
*break_point)) {
break_point_info->set_break_points(
ReadOnlyRoots(isolate).undefined_value());
}
return;
}
// If there are multiple break points shrink the array
DCHECK(break_point_info->break_points().IsFixedArray());
Handle<FixedArray> old_array = Handle<FixedArray>(
FixedArray::cast(break_point_info->break_points()), isolate);
Handle<FixedArray> new_array =
isolate->factory()->NewFixedArray(old_array->length() - 1);
int found_count = 0;
for (int i = 0; i < old_array->length(); i++) {
if (IsEqual(BreakPoint::cast(old_array->get(i)), *break_point)) {
DCHECK_EQ(found_count, 0);
found_count++;
} else {
new_array->set(i - found_count, old_array->get(i));
}
}
// If the break point was found in the list change it.
if (found_count > 0) break_point_info->set_break_points(*new_array);
}
// Add the specified break point object.
void BreakPointInfo::SetBreakPoint(Isolate* isolate,
Handle<BreakPointInfo> break_point_info,
Handle<BreakPoint> break_point) {
// If there was no break point objects before just set it.
if (break_point_info->break_points().IsUndefined(isolate)) {
break_point_info->set_break_points(*break_point);
return;
}
// If there was one break point object before replace with array.
if (!break_point_info->break_points().IsFixedArray()) {
if (IsEqual(BreakPoint::cast(break_point_info->break_points()),
*break_point)) {
return;
}
Handle<FixedArray> array = isolate->factory()->NewFixedArray(2);
array->set(0, break_point_info->break_points());
array->set(1, *break_point);
break_point_info->set_break_points(*array);
return;
}
// If there was more than one break point before extend array.
Handle<FixedArray> old_array = Handle<FixedArray>(
FixedArray::cast(break_point_info->break_points()), isolate);
Handle<FixedArray> new_array =
isolate->factory()->NewFixedArray(old_array->length() + 1);
for (int i = 0; i < old_array->length(); i++) {
// If the break point was there before just ignore.
if (IsEqual(BreakPoint::cast(old_array->get(i)), *break_point)) return;
new_array->set(i, old_array->get(i));
}
// Add the new break point.
new_array->set(old_array->length(), *break_point);
break_point_info->set_break_points(*new_array);
}
bool BreakPointInfo::HasBreakPoint(Isolate* isolate,
Handle<BreakPointInfo> break_point_info,
Handle<BreakPoint> break_point) {
// No break point.
if (break_point_info->break_points().IsUndefined(isolate)) {
return false;
}
// Single break point.
if (!break_point_info->break_points().IsFixedArray()) {
return IsEqual(BreakPoint::cast(break_point_info->break_points()),
*break_point);
}
// Multiple break points.
FixedArray array = FixedArray::cast(break_point_info->break_points());
for (int i = 0; i < array.length(); i++) {
if (IsEqual(BreakPoint::cast(array.get(i)), *break_point)) {
return true;
}
}
return false;
}
MaybeHandle<BreakPoint> BreakPointInfo::GetBreakPointById(
Isolate* isolate, Handle<BreakPointInfo> break_point_info,
int breakpoint_id) {
// No break point.
if (break_point_info->break_points().IsUndefined(isolate)) {
return MaybeHandle<BreakPoint>();
}
// Single break point.
if (!break_point_info->break_points().IsFixedArray()) {
BreakPoint breakpoint = BreakPoint::cast(break_point_info->break_points());
if (breakpoint.id() == breakpoint_id) {
return handle(breakpoint, isolate);
}
} else {
// Multiple break points.
FixedArray array = FixedArray::cast(break_point_info->break_points());
for (int i = 0; i < array.length(); i++) {
BreakPoint breakpoint = BreakPoint::cast(array.get(i));
if (breakpoint.id() == breakpoint_id) {
return handle(breakpoint, isolate);
}
}
}
return MaybeHandle<BreakPoint>();
}
// Get the number of break points.
int BreakPointInfo::GetBreakPointCount(Isolate* isolate) {
// No break point.
if (break_points().IsUndefined(isolate)) return 0;
// Single break point.
if (!break_points().IsFixedArray()) return 1;
// Multiple break points.
return FixedArray::cast(break_points()).length();
}
void CoverageInfo::InitializeSlot(int slot_index, int from_pos, int to_pos) {
set_slots_start_source_position(slot_index, from_pos);
set_slots_end_source_position(slot_index, to_pos);
ResetBlockCount(slot_index);
set_slots_padding(slot_index, 0);
}
void CoverageInfo::ResetBlockCount(int slot_index) {
set_slots_block_count(slot_index, 0);
}
void CoverageInfo::CoverageInfoPrint(std::ostream& os,
std::unique_ptr<char[]> function_name) {
DCHECK(FLAG_trace_block_coverage);
DisallowGarbageCollection no_gc;
os << "Coverage info (";
if (function_name == nullptr) {
os << "{unknown}";
} else if (strlen(function_name.get()) > 0) {
os << function_name.get();
} else {
os << "{anonymous}";
}
os << "):" << std::endl;
for (int i = 0; i < slot_count(); i++) {
os << "{" << slots_start_source_position(i) << ","
<< slots_end_source_position(i) << "}" << std::endl;
}
}
} // namespace internal
} // namespace v8
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