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Mini Shell
Mini Shell
// Copyright 2014 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 <vector>
#include "src/common/globals.h"
#include "src/debug/debug-coverage.h"
#include "src/debug/debug-scopes.h"
#include "src/debug/debug.h"
#include "src/debug/liveedit.h"
#include "src/execution/frames-inl.h"
#include "src/execution/isolate-inl.h"
#include "src/heap/heap-inl.h" // For ToBoolean. TODO(jkummerow): Drop.
#include "src/interpreter/bytecodes.h"
#include "src/interpreter/interpreter.h"
#include "src/objects/js-array-buffer-inl.h"
#include "src/objects/js-collection-inl.h"
#include "src/objects/js-generator-inl.h"
#include "src/objects/js-promise-inl.h"
#include "src/objects/js-weak-refs-inl.h"
#include "src/runtime/runtime-utils.h"
#include "src/runtime/runtime.h"
#include "src/snapshot/embedded/embedded-data.h"
#include "src/snapshot/snapshot.h"
#if V8_ENABLE_WEBASSEMBLY
#include "src/debug/debug-wasm-objects.h"
#include "src/wasm/wasm-objects-inl.h"
#endif // V8_ENABLE_WEBASSEMBLY
namespace v8 {
namespace internal {
RUNTIME_FUNCTION_RETURN_PAIR(Runtime_DebugBreakOnBytecode) {
using interpreter::Bytecode;
using interpreter::Bytecodes;
using interpreter::OperandScale;
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
Handle<Object> value = args.at(0);
HandleScope scope(isolate);
// Return value can be changed by debugger. Last set value will be used as
// return value.
ReturnValueScope result_scope(isolate->debug());
isolate->debug()->set_return_value(*value);
// Get the top-most JavaScript frame.
JavaScriptStackFrameIterator it(isolate);
if (isolate->debug_execution_mode() == DebugInfo::kBreakpoints) {
isolate->debug()->Break(it.frame(),
handle(it.frame()->function(), isolate));
}
// If the user requested to restart a frame, there is no need
// to get the return value or check the bytecode for side-effects.
if (isolate->debug()->IsRestartFrameScheduled()) {
Tagged<Object> exception = isolate->TerminateExecution();
return MakePair(exception,
Smi::FromInt(static_cast<uint8_t>(Bytecode::kIllegal)));
}
// Return the handler from the original bytecode array.
DCHECK(it.frame()->is_interpreted());
InterpretedFrame* interpreted_frame =
reinterpret_cast<InterpretedFrame*>(it.frame());
bool side_effect_check_failed = false;
if (isolate->debug_execution_mode() == DebugInfo::kSideEffects) {
side_effect_check_failed =
!isolate->debug()->PerformSideEffectCheckAtBytecode(interpreted_frame);
}
// Make sure to only access these objects after the side effect check, as the
// check can allocate on failure.
Tagged<SharedFunctionInfo> shared = interpreted_frame->function()->shared();
Tagged<BytecodeArray> bytecode_array = shared->GetBytecodeArray(isolate);
int bytecode_offset = interpreted_frame->GetBytecodeOffset();
Bytecode bytecode = Bytecodes::FromByte(bytecode_array->get(bytecode_offset));
if (Bytecodes::Returns(bytecode)) {
// If we are returning (or suspending), reset the bytecode array on the
// interpreted stack frame to the non-debug variant so that the interpreter
// entry trampoline sees the return/suspend bytecode rather than the
// DebugBreak.
interpreted_frame->PatchBytecodeArray(bytecode_array);
}
// We do not have to deal with operand scale here. If the bytecode at the
// break is prefixed by operand scaling, we would have patched over the
// scaling prefix. We now simply dispatch to the handler for the prefix.
// We need to deserialize now to ensure we don't hit the debug break again
// after deserializing.
OperandScale operand_scale = OperandScale::kSingle;
isolate->interpreter()->GetBytecodeHandler(bytecode, operand_scale);
if (side_effect_check_failed) {
return MakePair(ReadOnlyRoots(isolate).exception(),
Smi::FromInt(static_cast<uint8_t>(bytecode)));
}
Tagged<Object> interrupt_object = isolate->stack_guard()->HandleInterrupts();
if (IsException(interrupt_object, isolate)) {
return MakePair(interrupt_object,
Smi::FromInt(static_cast<uint8_t>(bytecode)));
}
return MakePair(isolate->debug()->return_value(),
Smi::FromInt(static_cast<uint8_t>(bytecode)));
}
RUNTIME_FUNCTION(Runtime_DebugBreakAtEntry) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
Handle<JSFunction> function = args.at<JSFunction>(0);
DCHECK(function->shared()->BreakAtEntry(isolate));
// Get the top-most JavaScript frame. This is the debug target function.
JavaScriptStackFrameIterator it(isolate);
DCHECK_EQ(*function, it.frame()->function());
// Check whether the next JS frame is closer than the last API entry.
// if yes, then the call to the debug target came from JavaScript. Otherwise,
// the call to the debug target came from API. Do not break for the latter.
it.Advance();
if (!it.done() &&
it.frame()->fp() < isolate->thread_local_top()->last_api_entry_) {
isolate->debug()->Break(it.frame(), function);
}
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_HandleDebuggerStatement) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
if (isolate->debug()->break_points_active()) {
isolate->debug()->HandleDebugBreak(
kIgnoreIfTopFrameBlackboxed,
v8::debug::BreakReasons({v8::debug::BreakReason::kDebuggerStatement}));
if (isolate->debug()->IsRestartFrameScheduled()) {
return isolate->TerminateExecution();
}
}
return isolate->stack_guard()->HandleInterrupts();
}
RUNTIME_FUNCTION(Runtime_ScheduleBreak) {
SealHandleScope shs(isolate);
DCHECK_EQ(0, args.length());
isolate->RequestInterrupt(
[](v8::Isolate* isolate, void*) {
v8::debug::BreakRightNow(
isolate,
v8::debug::BreakReasons({v8::debug::BreakReason::kScheduled}));
},
nullptr);
return ReadOnlyRoots(isolate).undefined_value();
}
namespace {
template <class IteratorType>
static Handle<ArrayList> AddIteratorInternalProperties(
Isolate* isolate, Handle<ArrayList> result, Handle<IteratorType> iterator) {
const char* kind = nullptr;
switch (iterator->map()->instance_type()) {
case JS_MAP_KEY_ITERATOR_TYPE:
kind = "keys";
break;
case JS_MAP_KEY_VALUE_ITERATOR_TYPE:
case JS_SET_KEY_VALUE_ITERATOR_TYPE:
kind = "entries";
break;
case JS_MAP_VALUE_ITERATOR_TYPE:
case JS_SET_VALUE_ITERATOR_TYPE:
kind = "values";
break;
default:
UNREACHABLE();
}
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[IteratorHasMore]]"),
isolate->factory()->ToBoolean(iterator->HasMore()));
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[IteratorIndex]]"),
handle(iterator->index(), isolate));
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[IteratorKind]]"),
isolate->factory()->NewStringFromAsciiChecked(kind));
return result;
}
} // namespace
MaybeHandle<JSArray> Runtime::GetInternalProperties(Isolate* isolate,
Handle<Object> object) {
auto result = ArrayList::New(isolate, 8 * 2);
if (IsJSObject(*object)) {
PrototypeIterator iter(isolate, Handle<JSObject>::cast(object),
kStartAtReceiver);
if (iter.HasAccess()) {
iter.Advance();
Handle<Object> prototype = PrototypeIterator::GetCurrent(iter);
if (!iter.IsAtEnd() && iter.HasAccess() && IsJSGlobalProxy(*object)) {
// Skip JSGlobalObject as the [[Prototype]].
DCHECK(IsJSGlobalObject(*prototype));
iter.Advance();
prototype = PrototypeIterator::GetCurrent(iter);
}
if (!IsNull(*prototype, isolate)) {
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromStaticChars("[[Prototype]]"),
prototype);
}
}
}
if (IsJSBoundFunction(*object)) {
Handle<JSBoundFunction> function = Handle<JSBoundFunction>::cast(object);
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[TargetFunction]]"),
handle(function->bound_target_function(), isolate));
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[BoundThis]]"),
handle(function->bound_this(), isolate));
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[BoundArgs]]"),
isolate->factory()->NewJSArrayWithElements(
isolate->factory()->CopyFixedArray(
handle(function->bound_arguments(), isolate))));
} else if (IsJSMapIterator(*object)) {
Handle<JSMapIterator> iterator = Handle<JSMapIterator>::cast(object);
result = AddIteratorInternalProperties(isolate, result, iterator);
} else if (IsJSSetIterator(*object)) {
Handle<JSSetIterator> iterator = Handle<JSSetIterator>::cast(object);
result = AddIteratorInternalProperties(isolate, result, iterator);
} else if (IsJSGeneratorObject(*object)) {
Handle<JSGeneratorObject> generator =
Handle<JSGeneratorObject>::cast(object);
const char* status = "suspended";
if (generator->is_closed()) {
status = "closed";
} else if (generator->is_executing()) {
status = "running";
} else {
DCHECK(generator->is_suspended());
}
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[GeneratorState]]"),
isolate->factory()->NewStringFromAsciiChecked(status));
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[GeneratorFunction]]"),
handle(generator->function(), isolate));
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[GeneratorReceiver]]"),
handle(generator->receiver(), isolate));
} else if (IsJSPromise(*object)) {
Handle<JSPromise> promise = Handle<JSPromise>::cast(object);
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[PromiseState]]"),
isolate->factory()->NewStringFromAsciiChecked(
JSPromise::Status(promise->status())));
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[PromiseResult]]"),
promise->status() == Promise::kPending
? isolate->factory()->undefined_value()
: handle(promise->result(), isolate));
} else if (IsJSProxy(*object)) {
Handle<JSProxy> js_proxy = Handle<JSProxy>::cast(object);
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[Handler]]"),
handle(js_proxy->handler(), isolate));
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[Target]]"),
handle(js_proxy->target(), isolate));
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[IsRevoked]]"),
isolate->factory()->ToBoolean(js_proxy->IsRevoked()));
} else if (IsJSPrimitiveWrapper(*object)) {
Handle<JSPrimitiveWrapper> js_value =
Handle<JSPrimitiveWrapper>::cast(object);
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[PrimitiveValue]]"),
handle(js_value->value(), isolate));
} else if (IsJSWeakRef(*object)) {
Handle<JSWeakRef> js_weak_ref = Handle<JSWeakRef>::cast(object);
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[WeakRefTarget]]"),
handle(js_weak_ref->target(), isolate));
} else if (IsJSArrayBuffer(*object)) {
Handle<JSArrayBuffer> js_array_buffer = Handle<JSArrayBuffer>::cast(object);
if (js_array_buffer->was_detached()) {
// Mark a detached JSArrayBuffer and such and don't even try to
// create views for it, since the TypedArray constructors will
// throw a TypeError when the underlying buffer is detached.
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[IsDetached]]"),
isolate->factory()->true_value());
} else {
const size_t byte_length = js_array_buffer->byte_length();
static_assert(JSTypedArray::kMaxByteLength ==
JSArrayBuffer::kMaxByteLength);
using DataView = std::tuple<const char*, ExternalArrayType, size_t>;
for (auto [name, type, elem_size] :
{DataView{"[[Int8Array]]", kExternalInt8Array, 1},
DataView{"[[Uint8Array]]", kExternalUint8Array, 1},
DataView{"[[Int16Array]]", kExternalInt16Array, 2},
DataView{"[[Int32Array]]", kExternalInt32Array, 4}}) {
if ((byte_length % elem_size) != 0) continue;
size_t length = byte_length / elem_size;
result =
ArrayList::Add(isolate, result,
isolate->factory()->NewStringFromAsciiChecked(name),
isolate->factory()->NewJSTypedArray(
type, js_array_buffer, 0, length));
}
result =
ArrayList::Add(isolate, result,
isolate->factory()->NewStringFromAsciiChecked(
"[[ArrayBufferByteLength]]"),
isolate->factory()->NewNumberFromSize(byte_length));
auto backing_store = js_array_buffer->GetBackingStore();
Handle<Object> array_buffer_data =
backing_store
? isolate->factory()->NewNumberFromUint(backing_store->id())
: isolate->factory()->null_value();
result = ArrayList::Add(
isolate, result,
isolate->factory()->NewStringFromAsciiChecked("[[ArrayBufferData]]"),
array_buffer_data);
Handle<Symbol> memory_symbol =
isolate->factory()->array_buffer_wasm_memory_symbol();
Handle<Object> memory_object =
JSObject::GetDataProperty(isolate, js_array_buffer, memory_symbol);
if (!IsUndefined(*memory_object, isolate)) {
result = ArrayList::Add(isolate, result,
isolate->factory()->NewStringFromAsciiChecked(
"[[WebAssemblyMemory]]"),
memory_object);
}
}
#if V8_ENABLE_WEBASSEMBLY
} else if (IsWasmInstanceObject(*object)) {
result = AddWasmInstanceObjectInternalProperties(
isolate, result, Handle<WasmInstanceObject>::cast(object));
} else if (IsWasmModuleObject(*object)) {
result = AddWasmModuleObjectInternalProperties(
isolate, result, Handle<WasmModuleObject>::cast(object));
} else if (IsWasmTableObject(*object)) {
result = AddWasmTableObjectInternalProperties(
isolate, result, Handle<WasmTableObject>::cast(object));
#endif // V8_ENABLE_WEBASSEMBLY
}
return isolate->factory()->NewJSArrayWithElements(
ArrayList::Elements(isolate, result), PACKED_ELEMENTS);
}
RUNTIME_FUNCTION(Runtime_GetGeneratorScopeCount) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
if (!IsJSGeneratorObject(args[0])) return Smi::zero();
// Check arguments.
Handle<JSGeneratorObject> gen = args.at<JSGeneratorObject>(0);
// Only inspect suspended generator scopes.
if (!gen->is_suspended()) {
return Smi::zero();
}
// Count the visible scopes.
int n = 0;
for (ScopeIterator it(isolate, gen); !it.Done(); it.Next()) {
n++;
}
return Smi::FromInt(n);
}
RUNTIME_FUNCTION(Runtime_GetGeneratorScopeDetails) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
if (!IsJSGeneratorObject(args[0])) {
return ReadOnlyRoots(isolate).undefined_value();
}
// Check arguments.
Handle<JSGeneratorObject> gen = args.at<JSGeneratorObject>(0);
int index = NumberToInt32(args[1]);
// Only inspect suspended generator scopes.
if (!gen->is_suspended()) {
return ReadOnlyRoots(isolate).undefined_value();
}
// Find the requested scope.
int n = 0;
ScopeIterator it(isolate, gen);
for (; !it.Done() && n < index; it.Next()) {
n++;
}
if (it.Done()) {
return ReadOnlyRoots(isolate).undefined_value();
}
return *it.MaterializeScopeDetails();
}
static bool SetScopeVariableValue(ScopeIterator* it, int index,
Handle<String> variable_name,
Handle<Object> new_value) {
for (int n = 0; !it->Done() && n < index; it->Next()) {
n++;
}
if (it->Done()) {
return false;
}
return it->SetVariableValue(variable_name, new_value);
}
// Change variable value in closure or local scope
// args[0]: number or JsFunction: break id or function
// args[1]: number: scope index
// args[2]: string: variable name
// args[3]: object: new value
//
// Return true if success and false otherwise
RUNTIME_FUNCTION(Runtime_SetGeneratorScopeVariableValue) {
HandleScope scope(isolate);
DCHECK_EQ(4, args.length());
Handle<JSGeneratorObject> gen = args.at<JSGeneratorObject>(0);
int index = NumberToInt32(args[1]);
Handle<String> variable_name = args.at<String>(2);
Handle<Object> new_value = args.at(3);
ScopeIterator it(isolate, gen);
bool res = SetScopeVariableValue(&it, index, variable_name, new_value);
return isolate->heap()->ToBoolean(res);
}
RUNTIME_FUNCTION(Runtime_GetBreakLocations) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CHECK(isolate->debug()->is_active());
Handle<JSFunction> fun = args.at<JSFunction>(0);
Handle<SharedFunctionInfo> shared(fun->shared(), isolate);
// Find the number of break points
Handle<Object> break_locations =
Debug::GetSourceBreakLocations(isolate, shared);
if (IsUndefined(*break_locations, isolate)) {
return ReadOnlyRoots(isolate).undefined_value();
}
// Return array as JS array
return *isolate->factory()->NewJSArrayWithElements(
Handle<FixedArray>::cast(break_locations));
}
// Returns the state of break on exceptions
// args[0]: boolean indicating uncaught exceptions
RUNTIME_FUNCTION(Runtime_IsBreakOnException) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
uint32_t type_arg = NumberToUint32(args[0]);
ExceptionBreakType type = static_cast<ExceptionBreakType>(type_arg);
bool result = isolate->debug()->IsBreakOnException(type);
return Smi::FromInt(result);
}
// Clear all stepping set by PrepareStep.
RUNTIME_FUNCTION(Runtime_ClearStepping) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
CHECK(isolate->debug()->is_active());
isolate->debug()->ClearStepping();
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DebugGetLoadedScriptIds) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
Handle<FixedArray> instances;
{
DebugScope debug_scope(isolate->debug());
// Fill the script objects.
instances = isolate->debug()->GetLoadedScripts();
}
// Convert the script objects to proper JS objects.
for (int i = 0; i < instances->length(); i++) {
Handle<Script> script(Script::cast(instances->get(i)), isolate);
instances->set(i, Smi::FromInt(script->id()));
}
// Return result as a JS array.
return *isolate->factory()->NewJSArrayWithElements(instances);
}
RUNTIME_FUNCTION(Runtime_FunctionGetInferredName) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
Tagged<Object> f = args[0];
if (IsJSFunction(f)) {
return JSFunction::cast(f)->shared()->inferred_name();
}
return ReadOnlyRoots(isolate).empty_string();
}
// Performs a GC.
// Presently, it only does a full GC.
RUNTIME_FUNCTION(Runtime_CollectGarbage) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
isolate->heap()->PreciseCollectAllGarbage(GCFlag::kNoFlags,
GarbageCollectionReason::kRuntime);
return ReadOnlyRoots(isolate).undefined_value();
}
namespace {
int ScriptLinePosition(Handle<Script> script, int line) {
if (line < 0) return -1;
#if V8_ENABLE_WEBASSEMBLY
if (script->type() == Script::Type::kWasm) {
// Wasm positions are relative to the start of the module.
return 0;
}
#endif // V8_ENABLE_WEBASSEMBLY
Script::InitLineEnds(script->GetIsolate(), script);
Tagged<FixedArray> line_ends_array = FixedArray::cast(script->line_ends());
const int line_count = line_ends_array->length();
DCHECK_LT(0, line_count);
if (line == 0) return 0;
// If line == line_count, we return the first position beyond the last line.
if (line > line_count) return -1;
return Smi::ToInt(line_ends_array->get(line - 1)) + 1;
}
int ScriptLinePositionWithOffset(Handle<Script> script, int line, int offset) {
if (line < 0 || offset < 0) return -1;
if (line == 0 || offset == 0)
return ScriptLinePosition(script, line) + offset;
Script::PositionInfo info;
if (!Script::GetPositionInfo(script, offset, &info,
Script::OffsetFlag::kNoOffset)) {
return -1;
}
const int total_line = info.line + line;
return ScriptLinePosition(script, total_line);
}
Handle<Object> GetJSPositionInfo(Handle<Script> script, int position,
Script::OffsetFlag offset_flag,
Isolate* isolate) {
Script::PositionInfo info;
if (!Script::GetPositionInfo(script, position, &info, offset_flag)) {
return isolate->factory()->null_value();
}
#if V8_ENABLE_WEBASSEMBLY
const bool is_wasm_script = script->type() == Script::Type::kWasm;
#else
const bool is_wasm_script = false;
#endif // V8_ENABLE_WEBASSEMBLY
Handle<String> sourceText =
is_wasm_script ? isolate->factory()->empty_string()
: isolate->factory()->NewSubString(
handle(String::cast(script->source()), isolate),
info.line_start, info.line_end);
Handle<JSObject> jsinfo =
isolate->factory()->NewJSObject(isolate->object_function());
JSObject::AddProperty(isolate, jsinfo, isolate->factory()->script_string(),
script, NONE);
JSObject::AddProperty(isolate, jsinfo, isolate->factory()->position_string(),
handle(Smi::FromInt(position), isolate), NONE);
JSObject::AddProperty(isolate, jsinfo, isolate->factory()->line_string(),
handle(Smi::FromInt(info.line), isolate), NONE);
JSObject::AddProperty(isolate, jsinfo, isolate->factory()->column_string(),
handle(Smi::FromInt(info.column), isolate), NONE);
JSObject::AddProperty(isolate, jsinfo,
isolate->factory()->sourceText_string(), sourceText,
NONE);
return jsinfo;
}
Handle<Object> ScriptLocationFromLine(Isolate* isolate, Handle<Script> script,
Handle<Object> opt_line,
Handle<Object> opt_column,
int32_t offset) {
// Line and column are possibly undefined and we need to handle these cases,
// additionally subtracting corresponding offsets.
int32_t line = 0;
if (!IsNullOrUndefined(*opt_line, isolate)) {
CHECK(IsNumber(*opt_line));
line = NumberToInt32(*opt_line) - script->line_offset();
}
int32_t column = 0;
if (!IsNullOrUndefined(*opt_column, isolate)) {
CHECK(IsNumber(*opt_column));
column = NumberToInt32(*opt_column);
if (line == 0) column -= script->column_offset();
}
int line_position = ScriptLinePositionWithOffset(script, line, offset);
if (line_position < 0 || column < 0) return isolate->factory()->null_value();
return GetJSPositionInfo(script, line_position + column,
Script::OffsetFlag::kNoOffset, isolate);
}
// Slow traversal over all scripts on the heap.
bool GetScriptById(Isolate* isolate, int needle, Handle<Script>* result) {
Script::Iterator iterator(isolate);
for (Tagged<Script> script = iterator.Next(); !script.is_null();
script = iterator.Next()) {
if (script->id() == needle) {
*result = handle(script, isolate);
return true;
}
}
return false;
}
} // namespace
// TODO(5530): Rename once conflicting function has been deleted.
RUNTIME_FUNCTION(Runtime_ScriptLocationFromLine2) {
HandleScope scope(isolate);
DCHECK_EQ(4, args.length());
int32_t scriptid = NumberToInt32(args[0]);
Handle<Object> opt_line = args.at(1);
Handle<Object> opt_column = args.at(2);
int32_t offset = NumberToInt32(args[3]);
Handle<Script> script;
CHECK(GetScriptById(isolate, scriptid, &script));
return *ScriptLocationFromLine(isolate, script, opt_line, opt_column, offset);
}
// On function call, depending on circumstances, prepare for stepping in,
// or perform a side effect check.
RUNTIME_FUNCTION(Runtime_DebugOnFunctionCall) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
Handle<JSFunction> fun = args.at<JSFunction>(0);
Handle<Object> receiver = args.at(1);
if (isolate->debug()->needs_check_on_function_call()) {
// Ensure that the callee will perform debug check on function call too.
Handle<SharedFunctionInfo> shared(fun->shared(), isolate);
isolate->debug()->DeoptimizeFunction(shared);
if (isolate->debug()->last_step_action() >= StepInto ||
isolate->debug()->break_on_next_function_call()) {
DCHECK_EQ(isolate->debug_execution_mode(), DebugInfo::kBreakpoints);
isolate->debug()->PrepareStepIn(fun);
}
if (isolate->debug_execution_mode() == DebugInfo::kSideEffects &&
!isolate->debug()->PerformSideEffectCheck(fun, receiver)) {
return ReadOnlyRoots(isolate).exception();
}
}
return ReadOnlyRoots(isolate).undefined_value();
}
// Set one shot breakpoints for the suspended generator object.
RUNTIME_FUNCTION(Runtime_DebugPrepareStepInSuspendedGenerator) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
isolate->debug()->PrepareStepInSuspendedGenerator();
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DebugPushPromise) {
DCHECK_EQ(1, args.length());
HandleScope scope(isolate);
Handle<JSObject> promise = args.at<JSObject>(0);
isolate->PushPromise(promise);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DebugPopPromise) {
DCHECK_EQ(0, args.length());
SealHandleScope shs(isolate);
isolate->PopPromise();
return ReadOnlyRoots(isolate).undefined_value();
}
namespace {
Handle<JSObject> MakeRangeObject(Isolate* isolate, const CoverageBlock& range) {
Factory* factory = isolate->factory();
Handle<String> start_string = factory->InternalizeUtf8String("start");
Handle<String> end_string = factory->InternalizeUtf8String("end");
Handle<String> count_string = factory->InternalizeUtf8String("count");
Handle<JSObject> range_obj = factory->NewJSObjectWithNullProto();
JSObject::AddProperty(isolate, range_obj, start_string,
factory->NewNumberFromInt(range.start), NONE);
JSObject::AddProperty(isolate, range_obj, end_string,
factory->NewNumberFromInt(range.end), NONE);
JSObject::AddProperty(isolate, range_obj, count_string,
factory->NewNumberFromUint(range.count), NONE);
return range_obj;
}
} // namespace
RUNTIME_FUNCTION(Runtime_DebugCollectCoverage) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
// Collect coverage data.
std::unique_ptr<Coverage> coverage;
if (isolate->is_best_effort_code_coverage()) {
coverage = Coverage::CollectBestEffort(isolate);
} else {
coverage = Coverage::CollectPrecise(isolate);
}
Factory* factory = isolate->factory();
// Turn the returned data structure into JavaScript.
// Create an array of scripts.
int num_scripts = static_cast<int>(coverage->size());
// Prepare property keys.
Handle<FixedArray> scripts_array = factory->NewFixedArray(num_scripts);
Handle<String> script_string = factory->script_string();
for (int i = 0; i < num_scripts; i++) {
const auto& script_data = coverage->at(i);
HandleScope inner_scope(isolate);
std::vector<CoverageBlock> ranges;
int num_functions = static_cast<int>(script_data.functions.size());
for (int j = 0; j < num_functions; j++) {
const auto& function_data = script_data.functions[j];
ranges.emplace_back(function_data.start, function_data.end,
function_data.count);
for (size_t k = 0; k < function_data.blocks.size(); k++) {
const auto& block_data = function_data.blocks[k];
ranges.emplace_back(block_data.start, block_data.end, block_data.count);
}
}
int num_ranges = static_cast<int>(ranges.size());
Handle<FixedArray> ranges_array = factory->NewFixedArray(num_ranges);
for (int j = 0; j < num_ranges; j++) {
Handle<JSObject> range_object = MakeRangeObject(isolate, ranges[j]);
ranges_array->set(j, *range_object);
}
Handle<JSArray> script_obj =
factory->NewJSArrayWithElements(ranges_array, PACKED_ELEMENTS);
JSObject::AddProperty(isolate, script_obj, script_string,
handle(script_data.script->source(), isolate), NONE);
scripts_array->set(i, *script_obj);
}
return *factory->NewJSArrayWithElements(scripts_array, PACKED_ELEMENTS);
}
RUNTIME_FUNCTION(Runtime_DebugTogglePreciseCoverage) {
SealHandleScope shs(isolate);
bool enable = Boolean::cast(args[0])->ToBool(isolate);
Coverage::SelectMode(isolate, enable ? debug::CoverageMode::kPreciseCount
: debug::CoverageMode::kBestEffort);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_DebugToggleBlockCoverage) {
SealHandleScope shs(isolate);
bool enable = Boolean::cast(args[0])->ToBool(isolate);
Coverage::SelectMode(isolate, enable ? debug::CoverageMode::kBlockCount
: debug::CoverageMode::kBestEffort);
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_IncBlockCounter) {
UNREACHABLE(); // Never called. See the IncBlockCounter builtin instead.
}
RUNTIME_FUNCTION(Runtime_DebugAsyncFunctionSuspended) {
DCHECK_EQ(5, args.length());
HandleScope scope(isolate);
Handle<JSPromise> promise = args.at<JSPromise>(0);
Handle<JSPromise> outer_promise = args.at<JSPromise>(1);
Handle<JSFunction> reject_handler = args.at<JSFunction>(2);
Handle<JSGeneratorObject> generator = args.at<JSGeneratorObject>(3);
bool is_predicted_as_caught = Boolean::cast(args[4])->ToBool(isolate);
// Allocate the throwaway promise and fire the appropriate init
// hook for the throwaway promise (passing the {promise} as its
// parent).
Handle<JSPromise> throwaway = isolate->factory()->NewJSPromiseWithoutHook();
isolate->OnAsyncFunctionSuspended(throwaway, promise);
// The Promise will be thrown away and not handled, but it
// shouldn't trigger unhandled reject events as its work is done
throwaway->set_has_handler(true);
// Enable proper debug support for promises.
if (isolate->debug()->is_active()) {
Object::SetProperty(isolate, reject_handler,
isolate->factory()->promise_forwarding_handler_symbol(),
isolate->factory()->true_value(),
StoreOrigin::kMaybeKeyed,
Just(ShouldThrow::kThrowOnError))
.Check();
promise->set_handled_hint(is_predicted_as_caught);
// Mark the dependency to {outer_promise} in case the {throwaway}
// Promise is found on the Promise stack
Object::SetProperty(isolate, throwaway,
isolate->factory()->promise_handled_by_symbol(),
outer_promise, StoreOrigin::kMaybeKeyed,
Just(ShouldThrow::kThrowOnError))
.Check();
Handle<WeakFixedArray> awaited_by_holder(
isolate->factory()->NewWeakFixedArray(1));
awaited_by_holder->Set(
0, MaybeObject::MakeWeak(MaybeObject::FromObject(*generator)));
Object::SetProperty(isolate, promise,
isolate->factory()->promise_awaited_by_symbol(),
awaited_by_holder, StoreOrigin::kMaybeKeyed,
Just(ShouldThrow::kThrowOnError))
.Check();
}
return *throwaway;
}
RUNTIME_FUNCTION(Runtime_DebugPromiseThen) {
DCHECK_EQ(1, args.length());
HandleScope scope(isolate);
Handle<JSReceiver> promise = args.at<JSReceiver>(0);
if (IsJSPromise(*promise)) {
isolate->OnPromiseThen(Handle<JSPromise>::cast(promise));
}
return *promise;
}
RUNTIME_FUNCTION(Runtime_LiveEditPatchScript) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
Handle<JSFunction> script_function = args.at<JSFunction>(0);
Handle<String> new_source = args.at<String>(1);
Handle<Script> script(Script::cast(script_function->shared()->script()),
isolate);
v8::debug::LiveEditResult result;
LiveEdit::PatchScript(isolate, script, new_source, /* preview */ false,
/* allow_top_frame_live_editing */ false, &result);
switch (result.status) {
case v8::debug::LiveEditResult::COMPILE_ERROR:
return isolate->Throw(*isolate->factory()->NewStringFromAsciiChecked(
"LiveEdit failed: COMPILE_ERROR"));
case v8::debug::LiveEditResult::BLOCKED_BY_RUNNING_GENERATOR:
return isolate->Throw(*isolate->factory()->NewStringFromAsciiChecked(
"LiveEdit failed: BLOCKED_BY_RUNNING_GENERATOR"));
case v8::debug::LiveEditResult::BLOCKED_BY_ACTIVE_FUNCTION:
return isolate->Throw(*isolate->factory()->NewStringFromAsciiChecked(
"LiveEdit failed: BLOCKED_BY_ACTIVE_FUNCTION"));
case v8::debug::LiveEditResult::BLOCKED_BY_TOP_LEVEL_ES_MODULE_CHANGE:
return isolate->Throw(*isolate->factory()->NewStringFromAsciiChecked(
"LiveEdit failed: BLOCKED_BY_TOP_LEVEL_ES_MODULE_CHANGE"));
case v8::debug::LiveEditResult::OK:
return ReadOnlyRoots(isolate).undefined_value();
}
return ReadOnlyRoots(isolate).undefined_value();
}
RUNTIME_FUNCTION(Runtime_ProfileCreateSnapshotDataBlob) {
HandleScope scope(isolate);
DCHECK_EQ(0, args.length());
// Used only by the test/memory/Memory.json benchmark. This creates a snapshot
// blob and outputs various statistics around it.
DCHECK(v8_flags.profile_deserialization && v8_flags.serialization_statistics);
DisableEmbeddedBlobRefcounting();
static constexpr char* kNoEmbeddedSource = nullptr;
// Have the SnapshotCreator create a new Isolate from scratch.
static constexpr Isolate* kNoIsolate = nullptr;
// We use this flag to tell the serializer not to finalize/seal RO space -
// this already happened after deserializing the main Isolate.
static constexpr Snapshot::SerializerFlags kSerializerFlags =
Snapshot::SerializerFlag::kAllowActiveIsolateForTesting;
v8::StartupData blob = CreateSnapshotDataBlobInternal(
v8::SnapshotCreator::FunctionCodeHandling::kClear, kNoEmbeddedSource,
kNoIsolate, kSerializerFlags);
delete[] blob.data;
// Track the embedded blob size as well.
{
i::EmbeddedData d = i::EmbeddedData::FromBlob(isolate);
PrintF("Embedded blob is %d bytes\n",
static_cast<int>(d.code_size() + d.data_size()));
}
FreeCurrentEmbeddedBlob();
return ReadOnlyRoots(isolate).undefined_value();
}
} // namespace internal
} // namespace v8
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