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/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2003, 2008, 2016 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "config.h"
#include "ErrorInstance.h"
#include "CodeBlock.h"
#include "InlineCallFrame.h"
#include "JSScope.h"
#include "JSCInlines.h"
#include "ParseInt.h"
#include <wtf/text/StringBuilder.h>
namespace JSC {
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(ErrorInstance);
const ClassInfo ErrorInstance::s_info = { "Error", &JSNonFinalObject::s_info, 0, CREATE_METHOD_TABLE(ErrorInstance) };
ErrorInstance::ErrorInstance(VM& vm, Structure* structure)
: JSNonFinalObject(vm, structure)
{
}
ErrorInstance* ErrorInstance::create(ExecState* state, Structure* structure, JSValue message, SourceAppender appender, RuntimeType type, bool useCurrentFrame)
{
VM& vm = state->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
String messageString = message.isUndefined() ? String() : message.toWTFString(state);
RETURN_IF_EXCEPTION(scope, nullptr);
return create(state, vm, structure, messageString, appender, type, useCurrentFrame);
}
static void appendSourceToError(CallFrame* callFrame, ErrorInstance* exception, unsigned bytecodeOffset)
{
ErrorInstance::SourceAppender appender = exception->sourceAppender();
exception->clearSourceAppender();
RuntimeType type = exception->runtimeTypeForCause();
exception->clearRuntimeTypeForCause();
if (!callFrame->codeBlock()->hasExpressionInfo())
return;
int startOffset = 0;
int endOffset = 0;
int divotPoint = 0;
unsigned line = 0;
unsigned column = 0;
CodeBlock* codeBlock;
CodeOrigin codeOrigin = callFrame->codeOrigin();
if (codeOrigin && codeOrigin.inlineCallFrame)
codeBlock = baselineCodeBlockForInlineCallFrame(codeOrigin.inlineCallFrame);
else
codeBlock = callFrame->codeBlock();
codeBlock->expressionRangeForBytecodeOffset(bytecodeOffset, divotPoint, startOffset, endOffset, line, column);
int expressionStart = divotPoint - startOffset;
int expressionStop = divotPoint + endOffset;
StringView sourceString = codeBlock->source()->source();
if (!expressionStop || expressionStart > static_cast<int>(sourceString.length()))
return;
VM* vm = &callFrame->vm();
JSValue jsMessage = exception->getDirect(*vm, vm->propertyNames->message);
if (!jsMessage || !jsMessage.isString())
return;
String message = asString(jsMessage)->value(callFrame);
if (expressionStart < expressionStop)
message = appender(message, codeBlock->source()->getRange(expressionStart, expressionStop).toString(), type, ErrorInstance::FoundExactSource);
else {
// No range information, so give a few characters of context.
int dataLength = sourceString.length();
int start = expressionStart;
int stop = expressionStart;
// Get up to 20 characters of context to the left and right of the divot, clamping to the line.
// Then strip whitespace.
while (start > 0 && (expressionStart - start < 20) && sourceString[start - 1] != '\n')
start--;
while (start < (expressionStart - 1) && isStrWhiteSpace(sourceString[start]))
start++;
while (stop < dataLength && (stop - expressionStart < 20) && sourceString[stop] != '\n')
stop++;
while (stop > expressionStart && isStrWhiteSpace(sourceString[stop - 1]))
stop--;
message = appender(message, codeBlock->source()->getRange(start, stop).toString(), type, ErrorInstance::FoundApproximateSource);
}
exception->putDirect(*vm, vm->propertyNames->message, jsString(vm, message));
}
class FindFirstCallerFrameWithCodeblockFunctor {
public:
FindFirstCallerFrameWithCodeblockFunctor(CallFrame* startCallFrame)
: m_startCallFrame(startCallFrame)
, m_foundCallFrame(nullptr)
, m_foundStartCallFrame(false)
, m_index(0)
{ }
StackVisitor::Status operator()(StackVisitor& visitor)
{
if (!m_foundStartCallFrame && (visitor->callFrame() == m_startCallFrame))
m_foundStartCallFrame = true;
if (m_foundStartCallFrame) {
if (visitor->callFrame()->codeBlock()) {
m_foundCallFrame = visitor->callFrame();
return StackVisitor::Done;
}
m_index++;
}
return StackVisitor::Continue;
}
CallFrame* foundCallFrame() const { return m_foundCallFrame; }
unsigned index() const { return m_index; }
private:
CallFrame* m_startCallFrame;
CallFrame* m_foundCallFrame;
bool m_foundStartCallFrame;
unsigned m_index;
};
void ErrorInstance::finishCreation(ExecState* exec, VM& vm, const String& message, bool useCurrentFrame)
{
Base::finishCreation(vm);
ASSERT(inherits(vm, info()));
if (!message.isNull())
putDirect(vm, vm.propertyNames->message, jsString(&vm, message), DontEnum);
unsigned bytecodeOffset = 0;
CallFrame* callFrame = nullptr;
bool hasTrace = addErrorInfoAndGetBytecodeOffset(exec, vm, this, useCurrentFrame, callFrame, hasSourceAppender() ? &bytecodeOffset : nullptr);
if (hasTrace && callFrame && hasSourceAppender()) {
if (callFrame && callFrame->codeBlock())
appendSourceToError(callFrame, this, bytecodeOffset);
}
}
// Based on ErrorPrototype's errorProtoFuncToString(), but is modified to
// have no observable side effects to the user (i.e. does not call proxies,
// and getters).
String ErrorInstance::sanitizedToString(ExecState* exec)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue nameValue;
auto namePropertName = vm.propertyNames->name;
PropertySlot nameSlot(this, PropertySlot::InternalMethodType::VMInquiry);
JSValue currentObj = this;
unsigned prototypeDepth = 0;
// We only check the current object and its prototype (2 levels) because normal
// Error objects may have a name property, and if not, its prototype should have
// a name property for the type of error e.g. "SyntaxError".
while (currentObj.isCell() && prototypeDepth++ < 2) {
JSObject* obj = jsCast<JSObject*>(currentObj);
if (JSObject::getOwnPropertySlot(obj, exec, namePropertName, nameSlot) && nameSlot.isValue()) {
nameValue = nameSlot.getValue(exec, namePropertName);
break;
}
currentObj = obj->getPrototypeDirect();
}
ASSERT(!scope.exception());
String nameString;
if (!nameValue)
nameString = ASCIILiteral("Error");
else {
nameString = nameValue.toWTFString(exec);
RETURN_IF_EXCEPTION(scope, String());
}
JSValue messageValue;
auto messagePropertName = vm.propertyNames->message;
PropertySlot messageSlot(this, PropertySlot::InternalMethodType::VMInquiry);
if (JSObject::getOwnPropertySlot(this, exec, messagePropertName, messageSlot) && messageSlot.isValue())
messageValue = messageSlot.getValue(exec, messagePropertName);
ASSERT(!scope.exception());
String messageString;
if (!messageValue)
messageString = String();
else {
messageString = messageValue.toWTFString(exec);
RETURN_IF_EXCEPTION(scope, String());
}
if (!nameString.length())
return messageString;
if (!messageString.length())
return nameString;
StringBuilder builder;
builder.append(nameString);
builder.appendLiteral(": ");
builder.append(messageString);
return builder.toString();
}
} // namespace JSC
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