| // 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/debug/debug-evaluate.h" |
| #include "src/objects/debug-objects-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| bool DebugInfo::IsEmpty() const { |
| return flags() == kNone && debugger_hints() == 0; |
| } |
| |
| bool DebugInfo::HasBreakInfo() const { return (flags() & kHasBreakInfo) != 0; } |
| |
| DebugInfo::ExecutionMode DebugInfo::DebugExecutionMode() const { |
| return (flags() & kDebugExecutionMode) != 0 ? kSideEffects : kBreakpoints; |
| } |
| |
| void DebugInfo::SetDebugExecutionMode(ExecutionMode value) { |
| set_flags(value == kSideEffects ? (flags() | kDebugExecutionMode) |
| : (flags() & ~kDebugExecutionMode)); |
| } |
| |
| void DebugInfo::ClearBreakInfo(Isolate* isolate) { |
| if (HasInstrumentedBytecodeArray()) { |
| // Reset function's bytecode array field to point to the original bytecode |
| // array. |
| shared()->SetDebugBytecodeArray(OriginalBytecodeArray()); |
| set_original_bytecode_array(ReadOnlyRoots(isolate).undefined_value()); |
| } |
| set_break_points(ReadOnlyRoots(isolate).empty_fixed_array()); |
| |
| int new_flags = flags(); |
| new_flags &= ~kHasBreakInfo & ~kPreparedForDebugExecution; |
| new_flags &= ~kBreakAtEntry & ~kCanBreakAtEntry; |
| new_flags &= ~kDebugExecutionMode; |
| set_flags(new_flags); |
| } |
| |
| void DebugInfo::SetBreakAtEntry() { |
| DCHECK(CanBreakAtEntry()); |
| set_flags(flags() | kBreakAtEntry); |
| } |
| |
| void DebugInfo::ClearBreakAtEntry() { |
| DCHECK(CanBreakAtEntry()); |
| set_flags(flags() & ~kBreakAtEntry); |
| } |
| |
| bool DebugInfo::BreakAtEntry() const { return (flags() & kBreakAtEntry) != 0; } |
| |
| bool DebugInfo::CanBreakAtEntry() const { |
| return (flags() & 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() & kHasCoverageInfo) != 0; |
| } |
| |
| void DebugInfo::ClearCoverageInfo(Isolate* isolate) { |
| if (HasCoverageInfo()) { |
| set_coverage_info(ReadOnlyRoots(isolate).undefined_value()); |
| |
| int new_flags = flags() & ~kHasCoverageInfo; |
| set_flags(new_flags); |
| } |
| } |
| |
| 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 the break point object is the same as before just ignore. |
| if (break_point_info->break_points() == *break_point) return; |
| // If there was one break point object before replace with array. |
| if (!break_point_info->break_points()->IsFixedArray()) { |
| 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; |
| } |
| |
| // 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(); |
| } |
| |
| int CoverageInfo::SlotCount() const { |
| DCHECK_EQ(kFirstSlotIndex, length() % kSlotIndexCount); |
| return (length() - kFirstSlotIndex) / kSlotIndexCount; |
| } |
| |
| int CoverageInfo::StartSourcePosition(int slot_index) const { |
| DCHECK_LT(slot_index, SlotCount()); |
| const int slot_start = CoverageInfo::FirstIndexForSlot(slot_index); |
| return Smi::ToInt(get(slot_start + kSlotStartSourcePositionIndex)); |
| } |
| |
| int CoverageInfo::EndSourcePosition(int slot_index) const { |
| DCHECK_LT(slot_index, SlotCount()); |
| const int slot_start = CoverageInfo::FirstIndexForSlot(slot_index); |
| return Smi::ToInt(get(slot_start + kSlotEndSourcePositionIndex)); |
| } |
| |
| int CoverageInfo::BlockCount(int slot_index) const { |
| DCHECK_LT(slot_index, SlotCount()); |
| const int slot_start = CoverageInfo::FirstIndexForSlot(slot_index); |
| return Smi::ToInt(get(slot_start + kSlotBlockCountIndex)); |
| } |
| |
| void CoverageInfo::InitializeSlot(int slot_index, int from_pos, int to_pos) { |
| DCHECK_LT(slot_index, SlotCount()); |
| const int slot_start = CoverageInfo::FirstIndexForSlot(slot_index); |
| set(slot_start + kSlotStartSourcePositionIndex, Smi::FromInt(from_pos)); |
| set(slot_start + kSlotEndSourcePositionIndex, Smi::FromInt(to_pos)); |
| set(slot_start + kSlotBlockCountIndex, Smi::kZero); |
| } |
| |
| void CoverageInfo::IncrementBlockCount(int slot_index) { |
| DCHECK_LT(slot_index, SlotCount()); |
| const int slot_start = CoverageInfo::FirstIndexForSlot(slot_index); |
| const int old_count = BlockCount(slot_index); |
| set(slot_start + kSlotBlockCountIndex, Smi::FromInt(old_count + 1)); |
| } |
| |
| void CoverageInfo::ResetBlockCount(int slot_index) { |
| DCHECK_LT(slot_index, SlotCount()); |
| const int slot_start = CoverageInfo::FirstIndexForSlot(slot_index); |
| set(slot_start + kSlotBlockCountIndex, Smi::kZero); |
| } |
| |
| void CoverageInfo::Print(std::unique_ptr<char[]> function_name) { |
| DCHECK(FLAG_trace_block_coverage); |
| DisallowHeapAllocation no_gc; |
| |
| StdoutStream os; |
| os << "Coverage info ("; |
| if (strlen(function_name.get()) > 0) { |
| os << function_name.get(); |
| } else { |
| os << "{anonymous}"; |
| } |
| os << "):" << std::endl; |
| |
| for (int i = 0; i < SlotCount(); i++) { |
| os << "{" << StartSourcePosition(i) << "," << EndSourcePosition(i) << "}" |
| << std::endl; |
| } |
| } |
| |
| } // namespace internal |
| } // namespace v8 |