root/core/Exception.cpp

DEFINITIONS

1. isValid
2. beginTry
3. beginLlvmUnwindTry
4. endTry
5. throwException
6. beginCatch

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is [Open Source Virtual Machine.].
 *
 * The Initial Developer of the Original Code is
 * Adobe System Incorporated.
 * Portions created by the Initial Developer are Copyright (C) 2004-2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Adobe AS3 Team
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */


#include "avmplus.h"

#if defined(AVMPLUS_AMD64) && defined(_WIN64)
        extern "C"
        {
                _int64 __cdecl longjmp64(jmp_buf jmpbuf, _int64 arg);
        }
#endif

namespace avmplus
{
        //
        // Exception
        //

        Exception::Exception(AvmCore* core, Atom atom)
        {
                this->atom = atom;
                this->flags = 0;

        #ifdef DEBUGGER
                // If the exception atom is an Error object, copy its stack trace.
                // Otherwise, generate a new stack trace.
                if (AvmCore::istype(atom, core->traits.error_itraits))
                {
                        stackTrace = ((ErrorObject*)AvmCore::atomToScriptObject(atom))->getStackTraceObject();
                }
                else
                {
                        stackTrace = core->newStackTrace();
                }
                #else
                (void)core;
                #endif
        }
        
        bool Exception::isValid()
        {
                return atomKind(atom) == kObjectType;
        }
        
        //
        // ExceptionHandlerTable
        //
        
        ExceptionHandlerTable::ExceptionHandlerTable(int exception_count)
        {
                this->exception_count = exception_count;
                VMPI_memset(exceptions, 0, sizeof(ExceptionHandler)*exception_count);
        }
        
        //
        // ExceptionFrame
        //

        void ExceptionFrame::beginTry(AvmCore* core)
        {
                this->core = core;

                prevFrame = core->exceptionFrame;

                if (!prevFrame) {
                        // Do special setup for first frame
                        core->setStackBase();
                }

                core->exceptionFrame = this;

#ifdef DEBUGGER
                callStack = core->callStack;
#endif /* DEBUGGER */

                // beginTry() is called from both the TRY macro and from JIT'd code.  The TRY
                // macro will immediately change the value of catchAction right after the
                // call to beginTry(); but the JIT'd code does not change catchAction.  So,
                // we initialize catchAction to the value that it needs when we're called
                // from JIT'd code, that is, kCatchAction_SearchForActionScriptExceptionHandler.
                catchAction = kCatchAction_SearchForActionScriptExceptionHandler;

                this->stacktop = core->gc->allocaTop();
                
                savedMethodFrame = core->currentMethodFrame;
#ifdef VMCFG_AOT
                this->llvmUnwindStyle = 0;
#endif
        }

#ifdef VMCFG_AOT
        void ExceptionFrame::beginLlvmUnwindTry(AvmCore *core)
        {
                beginTry(core);
                this->llvmUnwindStyle = 1;
        }
#endif

        void ExceptionFrame::endTry()
        {
                if (core) {
                        // ISSUE do we need to check core if it is set in constructor?
                        core->exceptionFrame = prevFrame;

                        core->gc->allocaPopTo(this->stacktop);

                        core->currentMethodFrame = savedMethodFrame;
                }
        }
        
        void ExceptionFrame::throwException(Exception *exception)
        {
                core->exceptionAddr = exception;
#ifdef VMCFG_AOT
                if(this->llvmUnwindStyle) {
                        llvm_unwind();
                        return;
                }
#endif

                VMPI_longjmpNoUnwind(jmpbuf, 1); 
        }

        void ExceptionFrame::beginCatch()
        {
                core->exceptionFrame = prevFrame;

#ifdef DEBUGGER
                //AvmAssert(callStack && callStack->env);
                Profiler* profiler = core->profiler();
                if (profiler && profiler->profilingDataWanted && callStack && callStack->env())
                        profiler->sendCatch(callStack->env()->method);

                core->callStack = callStack;
#endif // DEBUGGER

                core->currentMethodFrame = savedMethodFrame;

                core->gc->allocaPopTo(this->stacktop);
        }
}