llint/LLIntExceptions.cpp

   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,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  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 #include "config.h"
  27 #include "LLIntExceptions.h"
  28
  29 #if ENABLE(LLINT)
  30
  31 #include "CallFrame.h"
  32 #include "CodeBlock.h"
  33 #include "Instruction.h"
  34 #include "JITExceptions.h"
  35 #include "LLIntCommon.h"
  36 #include "LowLevelInterpreter.h"
  37 #include "Operations.h"
  38
  39 namespace JSC { namespace LLInt {
  40
  41 static void fixupPCforExceptionIfNeeded(ExecState* exec)
  42 {
  43     CodeBlock* codeBlock = exec->codeBlock();
  44     ASSERT(!!codeBlock);
  45     Instruction* pc = exec->currentVPC();
  46     exec->setCurrentVPC(codeBlock->adjustPCIfAtCallSite(pc));
  47 }
  48
  49 void interpreterThrowInCaller(ExecState* exec, ReturnAddressPtr pc)
  50 {
  51     VM* vm = &exec->vm();
  52     NativeCallFrameTracer tracer(vm, exec);
  53 #if LLINT_SLOW_PATH_TRACING
  54     dataLog("Throwing exception ", vm->exception, ".\n");
  55 #endif
  56     fixupPCforExceptionIfNeeded(exec);
  57     genericThrow(
  58         vm, exec, vm->exception,
  59         exec->codeBlock()->bytecodeOffset(exec, pc));
  60 }
  61
  62 Instruction* returnToThrowForThrownException(ExecState* exec)
  63 {
  64     UNUSED_PARAM(exec);
  65     return LLInt::exceptionInstructions();
  66 }
  67
  68 static void doThrow(ExecState* exec, Instruction* pc)
  69 {
  70     VM* vm = &exec->vm();
  71     NativeCallFrameTracer tracer(vm, exec);
  72     fixupPCforExceptionIfNeeded(exec);
  73     genericThrow(vm, exec, vm->exception, pc - exec->codeBlock()->instructions().begin());
  74 }
  75
  76 Instruction* returnToThrow(ExecState* exec, Instruction* pc)
  77 {
  78 #if LLINT_SLOW_PATH_TRACING
  79     VM* vm = &exec->vm();
  80     dataLog("Throwing exception ", vm->exception, " (returnToThrow).\n");
  81 #endif
  82     doThrow(exec, pc);
  83     return LLInt::exceptionInstructions();
  84 }
  85
  86 void* callToThrow(ExecState* exec, Instruction* pc)
  87 {
  88 #if LLINT_SLOW_PATH_TRACING
  89     VM* vm = &exec->vm();
  90     dataLog("Throwing exception ", vm->exception, " (callToThrow).\n");
  91 #endif
  92     doThrow(exec, pc);
  93     return LLInt::getCodePtr(llint_throw_during_call_trampoline);
  94 }
  95
  96 } } // namespace JSC::LLInt
  97
  98 #endif // ENABLE(LLINT)