void MethodInfo::setInterpImpl()
{
MethodSignaturep ms = getMethodSignature();
if (ms->returnTraitsBT() == BUILTIN_number)
_implFPR = avmplus::interpFPR;
else
_implGPR = avmplus::interpGPR;
AvmAssert(isInterpreted());
_invoker = hasTypedArgs(ms) ? MethodEnv::coerceEnter_interp : MethodEnv::coerceEnter_interp_nocoerce;
}
void MethodInfo::verify(Toplevel *toplevel, AbcEnv* abc_env)
{
AvmAssert(declaringTraits()->isResolved());
resolveSignature(toplevel);
AvmCore* core = this->pool()->core;
if (isNative())
{
union {
GprMethodProc implGPR;
AvmThunkNativeThunker thunker;
AvmThunkNativeThunkerN thunkerN;
} u;
#ifdef DEBUGGER
if (core->debugger())
{
MethodSignaturep ms = getMethodSignature();
if (ms->returnTraitsBT() == BUILTIN_number)
u.thunkerN = MethodInfo::debugEnterExitWrapperN;
else
u.thunker = MethodInfo::debugEnterExitWrapper32;
}
else
#endif
{
u.thunker = this->thunker();
}
this->setNativeImpl(u.implGPR);
}
else
{
#ifdef DEBUGGER
// just a fake CallStackNode here, so that if we throw a verify error,
// we get a stack trace with the method being verified as its top entry.
CallStackNode callStackNode(this);
#endif /* DEBUGGER */
PERFM_NTPROF("verify-ticks");
CodeWriter* coder = NULL;
Verifier verifier(this, toplevel, abc_env);
/*
These "buf" declarations are an unfortunate but expedient hack:
the existing CodeWriter classes (eg CodegenLIR, etc) have historically
always been stack-allocated, thus they have no WB protection on member
fields. Recent changes were made to allow for explicit cleanup() of them
in the event of exception, but there was a latent bug waiting to happen:
the actual automatic var was going out of scope, but still being referenced
(via the 'coder' pointer) in the exception handler, but the area being
pointed to may or may not still be valid. The ideal fix for this would
simply be to heap-allocate the CodeWriters, but that would require going
thru the existing code carefully and inserting WB where appropriate.
Instead, this "expedient" hack uses placement new to ensure the memory
stays valid into the exception handler.
Note: the lack of a call to the dtor of the CodeWriter(s) is not an oversight.
Calling cleanup() on coder is equivalent to running the dtor for all
of the CodeWriters here.
Note: allocated using arrays of intptr_t (rather than char) to ensure alignment is acceptable.
*/
#define MAKE_BUF(name, type) \
intptr_t name[(sizeof(type)+sizeof(intptr_t)-1)/sizeof(intptr_t)]
#if defined FEATURE_NANOJIT
MAKE_BUF(jit_buf, CodegenLIR);
#if defined AVMPLUS_WORD_CODE
MAKE_BUF(teeWriter_buf, TeeWriter);
#endif
#ifdef FEATURE_CFGWRITER
MAKE_BUF(cfg_buf, CFGWriter);
#endif
#endif
#if defined AVMPLUS_WORD_CODE
MAKE_BUF(translator_buf, WordcodeEmitter);
#else
MAKE_BUF(stubWriter_buf, CodeWriter);
#endif
TRY(core, kCatchAction_Rethrow)
{
#if defined FEATURE_NANOJIT
if ((core->IsJITEnabled()) && !suggestInterp())
{
PERFM_NTPROF("verify & IR gen");
// note placement-new usage!
CodegenLIR* jit = new(jit_buf) CodegenLIR(this);
#if defined AVMPLUS_WORD_CODE
WordcodeEmitter* translator = new(translator_buf) WordcodeEmitter(this, toplevel);
TeeWriter* teeWriter = new(teeWriter_buf) TeeWriter(translator, jit);
coder = teeWriter;
#else
coder = jit;
#endif
#ifdef FEATURE_CFGWRITER
// analyze code and generate LIR
CFGWriter* cfg = new(cfg_buf) CFGWriter(this, coder);
coder = cfg;
#endif
verifier.verify(coder);
PERFM_TPROF_END();
if (!jit->overflow) {
// assembler LIR into native code
jit->emitMD();
}
// the MD buffer can overflow so we need to re-iterate
// over the whole thing, since we aren't yet robust enough
// to just rebuild the MD code.
// mark it as interpreted and try to limp along
if (jit->overflow) {
if (core->JITMustSucceed()) {
Exception* e = new (core->GetGC()) Exception(core, core->newStringLatin1("JIT failed")->atom());
e->flags |= Exception::EXIT_EXCEPTION;
core->throwException(e);
}
setInterpImpl();
}
#ifdef AVMPLUS_WORD_CODE
else {
if (_abc.word_code.translated_code)
{
set_word_code(core->GetGC(), NULL);
}
if (_abc.word_code.exceptions)
{
_abc.word_code.exceptions = NULL;
}
}
#endif
}
else
{
// NOTE copied below
#if defined AVMPLUS_WORD_CODE
WordcodeEmitter* translator = new(translator_buf) WordcodeEmitter(this, toplevel);
coder = translator;
#else
CodeWriter* stubWriter = new(stubWriter_buf) CodeWriter();
coder = stubWriter;
#endif
verifier.verify(coder); // pass2 dataflow
setInterpImpl();
// NOTE end copy
}
#else // FEATURE_NANOJIT
// NOTE copied from above
#if defined AVMPLUS_WORD_CODE
WordcodeEmitter* translator = new(translator_buf) WordcodeEmitter(this, toplevel);
coder = translator;
#else
CodeWriter* stubWriter = new(stubWriter_buf) CodeWriter();
coder = stubWriter;
#endif
verifier.verify(coder); // pass2 dataflow
setInterpImpl();
// NOTE end copy
#endif // FEATURE_NANOJIT
if (coder)
{
coder->cleanup();
coder = NULL;
}
}
CATCH (Exception *exception)
{
// clean up verifier
verifier.~Verifier();
// call cleanup all the way down the chain
// each stage calls cleanup on the next one
if (coder)
coder->cleanup();
// re-throw exception
core->throwException(exception);
}
END_CATCH
END_TRY
PERFM_TPROF_END();
}