llint/LLIntExceptions.h

   1 /*
   2  * Copyright (C) 2011 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef LLIntExceptions_h
  27 #define LLIntExceptions_h
  28
  29 #include <wtf/Platform.h>
  30 #include <wtf/StdLibExtras.h>
  31
  32 #if ENABLE(LLINT)
  33
  34 #include "MacroAssemblerCodeRef.h"
  35
  36 namespace JSC {
  37
  38 class ExecState;
  39 struct Instruction;
  40
  41 namespace LLInt {
  42
  43 // Throw the currently active exception in the context of the caller's call frame.
  44 void interpreterThrowInCaller(ExecState* callerFrame, ReturnAddressPtr);
  45
  46 // Tells you where to jump to if you want to return-to-throw, after you've already
  47 // set up all information needed to throw the exception.
  48 Instruction* returnToThrowForThrownException(ExecState*);
  49
  50 // Saves the current PC in the global data for safe-keeping, and gives you a PC
  51 // that you can tell the interpreter to go to, which when advanced between 1
  52 // and 9 slots will give you an "instruction" that threads to the interpreter's
  53 // exception handler. Note that if you give it the PC for exception handling,
  54 // it's smart enough to just return that PC without doing anything else; this
  55 // lets you thread exception handling through common helper functions used by
  56 // other helpers.
  57 Instruction* returnToThrow(ExecState*, Instruction*);
  58
  59 // Use this when you're throwing to a call thunk.
  60 void* callToThrow(ExecState*, Instruction*);
  61
  62 } } // namespace JSC::LLInt
  63
  64 #endif // ENABLE(LLINT)
  65
  66 #endif // LLIntExceptions_h