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// Copyright 2016 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 <memory>
#include "include/v8-inspector.h"
#include "include/v8-util.h"
#include "include/v8.h"
#include "src/base/platform/time.h"
#include "src/common/globals.h"
#include "src/debug/interface-types.h"
#include "src/utils/vector.h"
namespace v8 {
namespace internal {
struct CoverageBlock;
struct CoverageFunction;
struct CoverageScript;
struct TypeProfileEntry;
struct TypeProfileScript;
class Coverage;
class DisableBreak;
class PostponeInterruptsScope;
class Script;
class TypeProfile;
} // namespace internal
namespace debug {
void SetContextId(Local<Context> context, int id);
int GetContextId(Local<Context> context);
void SetInspector(Isolate* isolate, v8_inspector::V8Inspector*);
v8_inspector::V8Inspector* GetInspector(Isolate* isolate);
// Schedule a debugger break to happen when function is called inside given
// isolate.
V8_EXPORT_PRIVATE void SetBreakOnNextFunctionCall(Isolate* isolate);
// Remove scheduled debugger break in given isolate if it has not
// happened yet.
V8_EXPORT_PRIVATE void ClearBreakOnNextFunctionCall(Isolate* isolate);
* Returns array of internal properties specific to the value type. Result has
* the following format: [<name>, <value>,...,<name>, <value>]. Result array
* will be allocated in the current context.
MaybeLocal<Array> GetInternalProperties(Isolate* isolate, Local<Value> value);
* Returns through the out parameters names_out a vector of names
* in v8::String for private members, including fields, methods,
* accessors specific to the value type.
* The values are returned through the out parameter values_out in the
* corresponding indices. Private fields and methods are returned directly
* while accessors are returned as v8::debug::AccessorPair. Missing components
* in the accessor pairs are null.
* If an exception occurs, false is returned. Otherwise true is returned.
* Results will be allocated in the current context and handle scope.
V8_EXPORT_PRIVATE bool GetPrivateMembers(Local<Context> context,
Local<Object> value,
std::vector<Local<Value>>* names_out,
std::vector<Local<Value>>* values_out);
* Forwards to v8::Object::CreationContext, but with special handling for
* JSGlobalProxy objects.
Local<Context> GetCreationContext(Local<Object> value);
enum ExceptionBreakState {
NoBreakOnException = 0,
BreakOnUncaughtException = 1,
BreakOnAnyException = 2
* Defines if VM will pause on exceptions or not.
* If BreakOnAnyExceptions is set then VM will pause on caught and uncaught
* exception, if BreakOnUncaughtException is set then VM will pause only on
* uncaught exception, otherwise VM won't stop on any exception.
void ChangeBreakOnException(Isolate* isolate, ExceptionBreakState state);
void RemoveBreakpoint(Isolate* isolate, BreakpointId id);
void SetBreakPointsActive(Isolate* isolate, bool is_active);
enum StepAction {
StepOut = 0, // Step out of the current function.
StepNext = 1, // Step to the next statement in the current function.
StepIn = 2 // Step into new functions invoked or the next statement
// in the current function.
void PrepareStep(Isolate* isolate, StepAction action);
void ClearStepping(Isolate* isolate);
V8_EXPORT_PRIVATE void BreakRightNow(Isolate* isolate);
// Use `SetTerminateOnResume` to indicate that an TerminateExecution interrupt
// should be set shortly before resuming, i.e. shortly before returning into
// the JavaScript stack frames on the stack. In contrast to setting the
// interrupt with `RequestTerminateExecution` directly, this flag allows
// the isolate to be entered for further JavaScript execution.
V8_EXPORT_PRIVATE void SetTerminateOnResume(Isolate* isolate);
bool AllFramesOnStackAreBlackboxed(Isolate* isolate);
class Script;
struct LiveEditResult {
enum Status {
Status status = OK;
bool stack_changed = false;
// Available only for OK.
v8::Local<v8::debug::Script> script;
// Fields below are available only for COMPILE_ERROR.
v8::Local<v8::String> message;
int line_number = -1;
int column_number = -1;
* Native wrapper around v8::internal::Script object.
class V8_EXPORT_PRIVATE Script {
v8::Isolate* GetIsolate() const;
ScriptOriginOptions OriginOptions() const;
bool WasCompiled() const;
bool IsEmbedded() const;
int Id() const;
int LineOffset() const;
int ColumnOffset() const;
std::vector<int> LineEnds() const;
MaybeLocal<String> Name() const;
MaybeLocal<String> SourceURL() const;
MaybeLocal<String> SourceMappingURL() const;
Maybe<int> ContextId() const;
MaybeLocal<String> Source() const;
bool IsWasm() const;
bool IsModule() const;
bool GetPossibleBreakpoints(
const debug::Location& start, const debug::Location& end,
bool restrict_to_function,
std::vector<debug::BreakLocation>* locations) const;
int GetSourceOffset(const debug::Location& location) const;
v8::debug::Location GetSourceLocation(int offset) const;
bool SetScriptSource(v8::Local<v8::String> newSource, bool preview,
LiveEditResult* result) const;
bool SetBreakpoint(v8::Local<v8::String> condition, debug::Location* location,
BreakpointId* id) const;
void RemoveWasmBreakpoint(BreakpointId id);
bool SetBreakpointOnScriptEntry(BreakpointId* id) const;
// Specialization for wasm Scripts.
class WasmScript : public Script {
static WasmScript* Cast(Script* script);
enum class DebugSymbolsType { None, SourceMap, EmbeddedDWARF, ExternalDWARF };
DebugSymbolsType GetDebugSymbolType() const;
MemorySpan<const char> ExternalSymbolsURL() const;
int NumFunctions() const;
int NumImportedFunctions() const;
MemorySpan<const uint8_t> Bytecode() const;
std::pair<int, int> GetFunctionRange(int function_index) const;
int GetContainingFunction(int byte_offset) const;
uint32_t GetFunctionHash(int function_index);
int CodeOffset() const;
int CodeLength() const;
V8_EXPORT_PRIVATE void GetLoadedScripts(
Isolate* isolate,
PersistentValueVector<Script>& scripts); // NOLINT(runtime/references)
MaybeLocal<UnboundScript> CompileInspectorScript(Isolate* isolate,
Local<String> source);
enum ExceptionType { kException, kPromiseRejection };
class DebugDelegate {
virtual ~DebugDelegate() = default;
virtual void ScriptCompiled(v8::Local<Script> script, bool is_live_edited,
bool has_compile_error) {}
// |inspector_break_points_hit| contains id of breakpoints installed with
// debug::Script::SetBreakpoint API.
virtual void BreakProgramRequested(
v8::Local<v8::Context> paused_context,
const std::vector<debug::BreakpointId>& inspector_break_points_hit) {}
virtual void ExceptionThrown(v8::Local<v8::Context> paused_context,
v8::Local<v8::Value> exception,
v8::Local<v8::Value> promise, bool is_uncaught,
ExceptionType exception_type) {}
virtual bool IsFunctionBlackboxed(v8::Local<debug::Script> script,
const debug::Location& start,
const debug::Location& end) {
return false;
virtual bool ShouldBeSkipped(v8::Local<v8::debug::Script> script, int line,
int column) {
return false;
V8_EXPORT_PRIVATE void SetDebugDelegate(Isolate* isolate,
DebugDelegate* listener);
V8_EXPORT_PRIVATE void TierDownAllModulesPerIsolate(Isolate* isolate);
V8_EXPORT_PRIVATE void TierUpAllModulesPerIsolate(Isolate* isolate);
class AsyncEventDelegate {
virtual ~AsyncEventDelegate() = default;
virtual void AsyncEventOccurred(debug::DebugAsyncActionType type, int id,
bool is_blackboxed) = 0;
void SetAsyncEventDelegate(Isolate* isolate, AsyncEventDelegate* delegate);
void ResetBlackboxedStateCache(Isolate* isolate,
v8::Local<debug::Script> script);
int EstimatedValueSize(Isolate* isolate, v8::Local<v8::Value> value);
enum Builtin { kStringToLowerCase };
Local<Function> GetBuiltin(Isolate* isolate, Builtin builtin);
V8_EXPORT_PRIVATE void SetConsoleDelegate(Isolate* isolate,
ConsoleDelegate* delegate);
int GetStackFrameId(v8::Local<v8::StackFrame> frame);
v8::Local<v8::StackTrace> GetDetailedStackTrace(Isolate* isolate,
v8::Local<v8::Object> error);
* Native wrapper around v8::internal::JSGeneratorObject object.
class GeneratorObject {
v8::MaybeLocal<debug::Script> Script();
v8::Local<v8::Function> Function();
debug::Location SuspendedLocation();
bool IsSuspended();
static v8::Local<debug::GeneratorObject> Cast(v8::Local<v8::Value> value);
* Provide API layer between inspector and code coverage.
class V8_EXPORT_PRIVATE Coverage {
// Forward declarations.
class ScriptData;
class FunctionData;
class V8_EXPORT_PRIVATE BlockData {
int StartOffset() const;
int EndOffset() const;
uint32_t Count() const;
explicit BlockData(i::CoverageBlock* block,
std::shared_ptr<i::Coverage> coverage)
: block_(block), coverage_(std::move(coverage)) {}
i::CoverageBlock* block_;
std::shared_ptr<i::Coverage> coverage_;
friend class v8::debug::Coverage::FunctionData;
class V8_EXPORT_PRIVATE FunctionData {
int StartOffset() const;
int EndOffset() const;
uint32_t Count() const;
MaybeLocal<String> Name() const;
size_t BlockCount() const;
bool HasBlockCoverage() const;
BlockData GetBlockData(size_t i) const;
explicit FunctionData(i::CoverageFunction* function,
std::shared_ptr<i::Coverage> coverage)
: function_(function), coverage_(std::move(coverage)) {}
i::CoverageFunction* function_;
std::shared_ptr<i::Coverage> coverage_;
friend class v8::debug::Coverage::ScriptData;
class V8_EXPORT_PRIVATE ScriptData {
Local<debug::Script> GetScript() const;
size_t FunctionCount() const;
FunctionData GetFunctionData(size_t i) const;
explicit ScriptData(size_t index, std::shared_ptr<i::Coverage> c);
i::CoverageScript* script_;
std::shared_ptr<i::Coverage> coverage_;
friend class v8::debug::Coverage;
static Coverage CollectPrecise(Isolate* isolate);
static Coverage CollectBestEffort(Isolate* isolate);
static void SelectMode(Isolate* isolate, CoverageMode mode);
size_t ScriptCount() const;
ScriptData GetScriptData(size_t i) const;
bool IsEmpty() const { return coverage_ == nullptr; }
explicit Coverage(std::shared_ptr<i::Coverage> coverage)
: coverage_(std::move(coverage)) {}
std::shared_ptr<i::Coverage> coverage_;
* Provide API layer between inspector and type profile.
class V8_EXPORT_PRIVATE TypeProfile {
class ScriptData; // Forward declaration.
class V8_EXPORT_PRIVATE Entry {
int SourcePosition() const;
std::vector<MaybeLocal<String>> Types() const;
explicit Entry(const i::TypeProfileEntry* entry,
std::shared_ptr<i::TypeProfile> type_profile)
: entry_(entry), type_profile_(std::move(type_profile)) {}
const i::TypeProfileEntry* entry_;
std::shared_ptr<i::TypeProfile> type_profile_;
friend class v8::debug::TypeProfile::ScriptData;
class V8_EXPORT_PRIVATE ScriptData {
Local<debug::Script> GetScript() const;
std::vector<Entry> Entries() const;
explicit ScriptData(size_t index,
std::shared_ptr<i::TypeProfile> type_profile);
i::TypeProfileScript* script_;
std::shared_ptr<i::TypeProfile> type_profile_;
friend class v8::debug::TypeProfile;
static TypeProfile Collect(Isolate* isolate);
static void SelectMode(Isolate* isolate, TypeProfileMode mode);
size_t ScriptCount() const;
ScriptData GetScriptData(size_t i) const;
explicit TypeProfile(std::shared_ptr<i::TypeProfile> type_profile)
: type_profile_(std::move(type_profile)) {}
std::shared_ptr<i::TypeProfile> type_profile_;
class V8_EXPORT_PRIVATE ScopeIterator {
static std::unique_ptr<ScopeIterator> CreateForFunction(
v8::Isolate* isolate, v8::Local<v8::Function> func);
static std::unique_ptr<ScopeIterator> CreateForGeneratorObject(
v8::Isolate* isolate, v8::Local<v8::Object> generator);
ScopeIterator() = default;
virtual ~ScopeIterator() = default;
enum ScopeType {
ScopeTypeGlobal = 0,
virtual bool Done() = 0;
virtual void Advance() = 0;
virtual ScopeType GetType() = 0;
virtual v8::Local<v8::Object> GetObject() = 0;
virtual v8::Local<v8::Value> GetFunctionDebugName() = 0;
virtual int GetScriptId() = 0;
virtual bool HasLocationInfo() = 0;
virtual debug::Location GetStartLocation() = 0;
virtual debug::Location GetEndLocation() = 0;
virtual bool SetVariableValue(v8::Local<v8::String> name,
v8::Local<v8::Value> value) = 0;
class V8_EXPORT_PRIVATE StackTraceIterator {
static bool SupportsWasmDebugEvaluate();
static std::unique_ptr<StackTraceIterator> Create(Isolate* isolate,
int index = 0);
StackTraceIterator() = default;
virtual ~StackTraceIterator() = default;
virtual bool Done() const = 0;
virtual void Advance() = 0;
virtual int GetContextId() const = 0;
virtual v8::MaybeLocal<v8::Value> GetReceiver() const = 0;
virtual v8::Local<v8::Value> GetReturnValue() const = 0;
virtual v8::Local<v8::String> GetFunctionDebugName() const = 0;
virtual v8::Local<v8::debug::Script> GetScript() const = 0;
virtual debug::Location GetSourceLocation() const = 0;
virtual v8::Local<v8::Function> GetFunction() const = 0;
virtual std::unique_ptr<ScopeIterator> GetScopeIterator() const = 0;
virtual bool Restart() = 0;
virtual v8::MaybeLocal<v8::Value> Evaluate(v8::Local<v8::String> source,
bool throw_on_side_effect) = 0;
virtual v8::MaybeLocal<v8::String> EvaluateWasm(
internal::Vector<const internal::byte> source, int frame_index) = 0;
class QueryObjectPredicate {
virtual ~QueryObjectPredicate() = default;
virtual bool Filter(v8::Local<v8::Object> object) = 0;
void QueryObjects(v8::Local<v8::Context> context,
QueryObjectPredicate* predicate,
v8::PersistentValueVector<v8::Object>* objects);
void GlobalLexicalScopeNames(v8::Local<v8::Context> context,
v8::PersistentValueVector<v8::String>* names);
void SetReturnValue(v8::Isolate* isolate, v8::Local<v8::Value> value);
enum class NativeAccessorType {
None = 0,
HasGetter = 1 << 0,
HasSetter = 1 << 1
int64_t GetNextRandomInt64(v8::Isolate* isolate);
using RuntimeCallCounterCallback =
std::function<void(const char* name, int64_t count, base::TimeDelta time)>;
void EnumerateRuntimeCallCounters(v8::Isolate* isolate,
RuntimeCallCounterCallback callback);
enum class EvaluateGlobalMode {
V8_EXPORT_PRIVATE v8::MaybeLocal<v8::Value> EvaluateGlobal(
v8::Isolate* isolate, v8::Local<v8::String> source, EvaluateGlobalMode mode,
bool repl_mode = false);
int GetDebuggingId(v8::Local<v8::Function> function);
bool SetFunctionBreakpoint(v8::Local<v8::Function> function,
v8::Local<v8::String> condition, BreakpointId* id);
v8::Platform* GetCurrentPlatform();
void ForceGarbageCollection(
v8::Isolate* isolate,
v8::EmbedderHeapTracer::EmbedderStackState embedder_stack_state);
class PostponeInterruptsScope {
explicit PostponeInterruptsScope(v8::Isolate* isolate);
std::unique_ptr<i::PostponeInterruptsScope> scope_;
class DisableBreakScope {
explicit DisableBreakScope(v8::Isolate* isolate);
std::unique_ptr<i::DisableBreak> scope_;
class WeakMap : public v8::Object {
WeakMap() = delete;
V8_EXPORT_PRIVATE V8_WARN_UNUSED_RESULT v8::MaybeLocal<v8::Value> Get(
v8::Local<v8::Context> context, v8::Local<v8::Value> key);
v8::Local<v8::Context> context, v8::Local<v8::Value> key,
v8::Local<v8::Value> value);
V8_EXPORT_PRIVATE static Local<WeakMap> New(v8::Isolate* isolate);
V8_INLINE static WeakMap* Cast(Value* obj);
* Pairs of accessors.
* In the case of private accessors, getters and setters are either null or
* Functions.
class V8_EXPORT_PRIVATE AccessorPair : public v8::Value {
AccessorPair() = delete;
v8::Local<v8::Value> getter();
v8::Local<v8::Value> setter();
static bool IsAccessorPair(v8::Local<v8::Value> obj);
V8_INLINE static AccessorPair* Cast(v8::Value* obj);
static void CheckCast(v8::Value* obj);
struct PropertyDescriptor {
bool enumerable : 1;
bool has_enumerable : 1;
bool configurable : 1;
bool has_configurable : 1;
bool writable : 1;
bool has_writable : 1;
v8::Local<v8::Value> value;
v8::Local<v8::Value> get;
v8::Local<v8::Value> set;
class PropertyIterator {
static std::unique_ptr<PropertyIterator> Create(v8::Local<v8::Object> object);
virtual ~PropertyIterator() = default;
virtual bool Done() const = 0;
virtual void Advance() = 0;
virtual v8::Local<v8::Name> name() const = 0;
virtual bool is_native_accessor() = 0;
virtual bool has_native_getter() = 0;
virtual bool has_native_setter() = 0;
virtual Maybe<PropertyAttribute> attributes() = 0;
virtual Maybe<PropertyDescriptor> descriptor() = 0;
virtual bool is_own() = 0;
virtual bool is_array_index() = 0;
// Wrapper around v8::internal::WasmValue.
class V8_EXPORT_PRIVATE WasmValue : public v8::Value {
WasmValue() = delete;
static bool IsWasmValue(v8::Local<v8::Value> obj);
V8_INLINE static WasmValue* Cast(v8::Value* obj);
int value_type();
// Get the underlying values as a byte array, this is only valid if value_type
// is i32, i64, f32, f64, or s128.
v8::Local<v8::Array> bytes();
// Get the underlying externref, only valid if value_type is externref.
v8::Local<v8::Value> ref();
static void CheckCast(v8::Value* obj);
AccessorPair* AccessorPair::Cast(v8::Value* value) {
return static_cast<AccessorPair*>(value);
WasmValue* WasmValue::Cast(v8::Value* value) {
return static_cast<WasmValue*>(value);
MaybeLocal<Message> GetMessageFromPromise(Local<Promise> promise);
} // namespace debug
} // namespace v8