/*

 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1.  Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 * 2.  Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "config.h"

#include "ExceptionHelpers.h"

#include "CodeBlock.h"

#include "CallFrame.h"

#include "JSGlobalObjectFunctions.h"

#include "JSObject.h"

#include "JSNotAnObject.h"

#include "Interpreter.h"

#include "Nodes.h"

namespace JSC {

class InterruptedExecutionError : public JSObject {

public:

    InterruptedExecutionError(JSGlobalData* globalData)

        : JSObject(globalData->interruptedExecutionErrorStructure)

    {

    }

    virtual ComplType exceptionType() const { return Interrupted; }

    virtual UString toString(ExecState*) const { return "JavaScript execution exceeded timeout."; }

};

JSValue createInterruptedExecutionException(JSGlobalData* globalData)

{

    return new (globalData) InterruptedExecutionError(globalData);

}

class TerminatedExecutionError : public JSObject {

public:

    TerminatedExecutionError(JSGlobalData* globalData)

        : JSObject(globalData->terminatedExecutionErrorStructure)

    {

    }

    virtual ComplType exceptionType() const { return Terminated; }

    virtual UString toString(ExecState*) const { return "JavaScript execution terminated."; }

};

JSValue createTerminatedExecutionException(JSGlobalData* globalData)

{

    return new (globalData) TerminatedExecutionError(globalData);

}

JSObject* createStackOverflowError(ExecState* exec)

{

    return createRangeError(exec, "Maximum call stack size exceeded.");

}

JSObject* createStackOverflowError(JSGlobalObject* globalObject)

{

    return createRangeError(globalObject, "Maximum call stack size exceeded.");

}

JSValue createUndefinedVariableError(ExecState* exec, const Identifier& ident, unsigned bytecodeOffset, CodeBlock* codeBlock)

{

    int startOffset = 0;

    int endOffset = 0;

    int divotPoint = 0;

    int line = codeBlock->expressionRangeForBytecodeOffset(exec, bytecodeOffset, divotPoint, startOffset, endOffset);

    UString message(makeString("Can't find variable: ", ident.ustring()));

    JSObject* exception = addErrorInfo(exec, createReferenceError(exec, message), line, codeBlock->ownerExecutable()->source(), divotPoint, startOffset, endOffset);

    return exception;

}

static UString createErrorMessage(ExecState* exec, CodeBlock* codeBlock, int, int expressionStart, int expressionStop, JSValue value, UString error)

{

    if (!expressionStop || expressionStart > codeBlock->source()->length())

        return makeString(value.toString(exec), " is ", error);

    if (expressionStart < expressionStop)

        return makeString("Result of expression '", codeBlock->source()->getRange(expressionStart, expressionStop), "' [", value.toString(exec), "] is ", error, ".");

    // No range information, so give a few characters of context

    const UChar* data = codeBlock->source()->data();

    int dataLength = codeBlock->source()->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) && data[start - 1] != '\n')

        start--;

    while (start < (expressionStart - 1) && isStrWhiteSpace(data[start]))

        start++;

    while (stop < dataLength && (stop - expressionStart < 20) && data[stop] != '\n')

        stop++;

    while (stop > expressionStart && isStrWhiteSpace(data[stop]))

        stop--;

    return makeString("Result of expression near '...", codeBlock->source()->getRange(start, stop), "...' [", value.toString(exec), "] is ", error, ".");

}

JSObject* createInvalidParamError(ExecState* exec, const char* op, JSValue value, unsigned bytecodeOffset, CodeBlock* codeBlock)

{

    int startOffset = 0;

    int endOffset = 0;

    int divotPoint = 0;

    int line = codeBlock->expressionRangeForBytecodeOffset(exec, bytecodeOffset, divotPoint, startOffset, endOffset);

    UString errorMessage = createErrorMessage(exec, codeBlock, line, divotPoint, divotPoint + endOffset, value, makeString("not a valid argument for '", op, "'"));

    JSObject* exception = addErrorInfo(exec, createTypeError(exec, errorMessage), line, codeBlock->ownerExecutable()->source(), divotPoint, startOffset, endOffset);

    return exception;

}

JSObject* createNotAConstructorError(ExecState* exec, JSValue value, unsigned bytecodeOffset, CodeBlock* codeBlock)

{

    int startOffset = 0;

    int endOffset = 0;

    int divotPoint = 0;

    int line = codeBlock->expressionRangeForBytecodeOffset(exec, bytecodeOffset, divotPoint, startOffset, endOffset);

    // We're in a "new" expression, so we need to skip over the "new.." part

    int startPoint = divotPoint - (startOffset ? startOffset - 4 : 0); // -4 for "new "

    const UChar* data = codeBlock->source()->data();

    while (startPoint < divotPoint && isStrWhiteSpace(data[startPoint]))

        startPoint++;

    UString errorMessage = createErrorMessage(exec, codeBlock, line, startPoint, divotPoint, value, "not a constructor");

    JSObject* exception = addErrorInfo(exec, createTypeError(exec, errorMessage), line, codeBlock->ownerExecutable()->source(), divotPoint, startOffset, endOffset);

    return exception;

}

JSValue createNotAFunctionError(ExecState* exec, JSValue value, unsigned bytecodeOffset, CodeBlock* codeBlock)

{

    int startOffset = 0;

    int endOffset = 0;

    int divotPoint = 0;

    int line = codeBlock->expressionRangeForBytecodeOffset(exec, bytecodeOffset, divotPoint, startOffset, endOffset);

    UString errorMessage = createErrorMessage(exec, codeBlock, line, divotPoint - startOffset, divotPoint, value, "not a function");

    JSObject* exception = addErrorInfo(exec, createTypeError(exec, errorMessage), line, codeBlock->ownerExecutable()->source(), divotPoint, startOffset, endOffset);

    return exception;

}

JSNotAnObjectErrorStub* createNotAnObjectErrorStub(ExecState* exec, bool isNull)

{

    return new (exec) JSNotAnObjectErrorStub(exec, isNull);

}

JSObject* createNotAnObjectError(ExecState* exec, JSNotAnObjectErrorStub* error, unsigned bytecodeOffset, CodeBlock* codeBlock)

{

    // Both op_create_this and op_instanceof require a use of op_get_by_id to get

    // the prototype property from an object. The exception messages for exceptions

    // thrown by these instances op_get_by_id need to reflect this.

    OpcodeID followingOpcodeID;

    if (codeBlock->getByIdExceptionInfoForBytecodeOffset(exec, bytecodeOffset, followingOpcodeID)) {

        ASSERT(followingOpcodeID == op_create_this || followingOpcodeID == op_instanceof);

        if (followingOpcodeID == op_create_this)

            return createNotAConstructorError(exec, error->isNull() ? jsNull() : jsUndefined(), bytecodeOffset, codeBlock);

        return createInvalidParamError(exec, "instanceof", error->isNull() ? jsNull() : jsUndefined(), bytecodeOffset, codeBlock);

    }

    int startOffset = 0;

    int endOffset = 0;

    int divotPoint = 0;

    int line = codeBlock->expressionRangeForBytecodeOffset(exec, bytecodeOffset, divotPoint, startOffset, endOffset);

    UString errorMessage = createErrorMessage(exec, codeBlock, line, divotPoint - startOffset, divotPoint, error->isNull() ? jsNull() : jsUndefined(), "not an object");

    JSObject* exception = addErrorInfo(exec, createTypeError(exec, errorMessage), line, codeBlock->ownerExecutable()->source(), divotPoint, startOffset, endOffset);

    return exception;

}

JSValue throwOutOfMemoryError(ExecState* exec)

{

    return throwError(exec, createError(exec, "Out of memory"));

}

} // namespace JSC