avmplus.cpp
/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 4 -*- */
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/* ***** 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 ] Adobe Systems Incorporated. All Rights
* Reserved.
*
* Contributor(s): Adobe AS3 Team
* Andreas Gal <gal@mozilla.com>
*
* 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
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***** END LICENSE BLOCK ***** */
#include <signal.h>
#include "nanojit.h"
#ifdef SOLARIS
typedef caddr_t maddr_ptr;
#else
typedef void *maddr_ptr;
#endif
using namespace avmplus;
void
avmplus::AvmLog(char const *msg, ...) {
va_list ap;
va_start(ap, msg);
VMPI_vfprintf(stderr, msg, ap);
va_end(ap);
}
#ifdef _DEBUG
namespace avmplus {
void AvmAssertFail(const char* /* msg */) {
fflush(stderr);
#if defined(WIN32)
DebugBreak();
exit(3);
#elif defined(__APPLE__)
/*
* On Mac OS X, Breakpad ignores signals. Only real Mach exceptions are
* trapped.
*/
*((int *) NULL) = 0; /* To continue from here in GDB: "return" then "continue". */
raise(SIGABRT); /* In case above statement gets nixed by the optimizer. */
#else
raise(SIGABRT); /* To continue from here in GDB: "signal 0". */
#endif
}
}
#endif
#if defined(WIN32)
void*
nanojit::CodeAlloc::allocCodeChunk(size_t nbytes) {
return VirtualAlloc(NULL,
nbytes,
MEM_COMMIT | MEM_RESERVE,
PAGE_EXECUTE_READWRITE);
}
void
nanojit::CodeAlloc::freeCodeChunk(void *p, size_t) {
VirtualFree(p, 0, MEM_RELEASE);
}
#elif defined(AVMPLUS_OS2)
void*
nanojit::CodeAlloc::allocCodeChunk(size_t nbytes) {
// alloc from high memory, fallback to low memory if that fails
void * addr;
if (DosAllocMem(&addr, nbytes, OBJ_ANY |
PAG_COMMIT | PAG_READ | PAG_WRITE | PAG_EXECUTE)) {
if (DosAllocMem(&addr, nbytes,
PAG_COMMIT | PAG_READ | PAG_WRITE | PAG_EXECUTE)) {
return 0;
}
}
return addr;
}
void
nanojit::CodeAlloc::freeCodeChunk(void *p, size_t nbytes) {
DosFreeMem(p);
}
#elif defined(AVMPLUS_UNIX)
void*
nanojit::CodeAlloc::allocCodeChunk(size_t nbytes) {
return mmap(NULL,
nbytes,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANON,
-1,
0);
}
void
nanojit::CodeAlloc::freeCodeChunk(void *p, size_t nbytes) {
munmap((maddr_ptr)p, nbytes);
}
#else // !WIN32 && !AVMPLUS_OS2 && !AVMPLUS_UNIX
void*
nanojit::CodeAlloc::allocCodeChunk(size_t nbytes) {
void* mem = valloc(nbytes);
VMPI_setPageProtection(mem, nbytes, true /* exec */, true /* write */);
return mem;
}
void
nanojit::CodeAlloc::freeCodeChunk(void *p, size_t nbytes) {
VMPI_setPageProtection(p, nbytes, false /* exec */, true /* write */);
::free(p);
}
#endif // WIN32
// All of the allocCodeChunk/freeCodeChunk implementations above allocate
// code memory as RWX and then free it, so the explicit page protection api's
// below are no-ops.
void
nanojit::CodeAlloc::markCodeChunkWrite(void*, size_t)
{}
void
nanojit::CodeAlloc::markCodeChunkExec(void*, size_t)
{}
bool
nanojit::CodeAlloc::checkChunkMark(void* /*addr*/, size_t /*nbytes*/, bool /*isExec*/) {
return true; // always correct
}