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// natStackTrace.cc - native helper methods for Throwable
/* Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
/**
* @author Andrew Haley <aph@cygnus.com>
* @author Mark Wielaard <mark@klomp.org>
*
* Native helper methods for VM specific Throwable support.
*/
#include <config.h>
#include <platform.h>
#include <string.h>
#include <jvm.h>
#include <gcj/cni.h>
#include <gnu/gcj/RawData.h>
#include <java/lang/Object.h>
#include <java-threads.h>
#include <gnu/gcj/runtime/MethodRef.h>
#include <gnu/gcj/runtime/StackTrace.h>
#include <java/lang/Thread.h>
#include <java-interp.h>
#include <java/util/IdentityHashMap.h>
#include <java/lang/ArrayIndexOutOfBoundsException.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef HAVE_EXECINFO_H
#include <execinfo.h>
#endif
#include <unwind.h>
// Fill in this stack trace with MAXLEN elements starting at offset.
void
gnu::gcj::runtime::StackTrace::fillInStackTrace (jint maxlen, jint offset)
{
#ifdef HAVE_BACKTRACE
offset += 1;
void *_p[maxlen + offset];
len = backtrace (_p, maxlen + offset) - offset;
void **p = _p + offset;
_Jv_frame_info *frame;
if (len > 0)
{
#ifdef INTERPRETER
extern void _Jv_StartOfInterpreter (void);
extern void _Jv_EndOfInterpreter (void);
java::lang::Thread *thread = java::lang::Thread::currentThread();
_Jv_MethodChain *interp_frame
= (thread ? reinterpret_cast<_Jv_MethodChain *> (thread->interp_frame)
: NULL);
#endif // INTERPRETER
frame = (_Jv_frame_info *) _Jv_Malloc (len * sizeof (_Jv_frame_info));
for (int n = 0; n < len; n++)
{
frame[n].addr = p[n];
#ifdef INTERPRETER
if (p[n] >= &_Jv_StartOfInterpreter && p[n] <= &_Jv_EndOfInterpreter)
{
frame[n].interp = (void *) interp_frame->self;
interp_frame = interp_frame->next;
}
else
frame[n].interp = 0;
#endif // INTERPRETER
}
}
else
frame = NULL;
addrs = reinterpret_cast<gnu::gcj::RawData *> (frame);
#else // HAVE_BACKTRACE
(void)maxlen;
(void)offset;
#endif // HAVE_BACKTRACE
}
/* Obtain the next power-of-2 of some integer. */
static inline jint
nextpowerof2 (jint n)
{
n |= (n >> 1);
n |= (n >> 2);
n |= (n >> 4);
n |= (n >> 8);
n |= (n >> 16);
return n+1;
}
#define GET_FRAME(N) \
({ \
if ((N) >= len) \
fillInStackTrace (nextpowerof2 (N), 1); \
if ((N) < 0 || (N) >= len) \
throw new ::java::lang::ArrayIndexOutOfBoundsException (); \
\
_Jv_frame_info *frame = (_Jv_frame_info *)addrs; \
&frame[N]; \
})
gnu::gcj::runtime::MethodRef *
gnu::gcj::runtime::StackTrace::getCompiledMethodRef (gnu::gcj::RawData *addr)
{
void *p = _Unwind_FindEnclosingFunction (addr);
return gnu::gcj::runtime::StackTrace
::methodAtAddress ((gnu::gcj::RawData *)p);
}
java::lang::Class *
gnu::gcj::runtime::StackTrace::classAt (jint n)
{
_Jv_frame_info *frame = GET_FRAME (n);
#ifdef INTERPRETER
if (frame->interp)
{
_Jv_InterpMethod *meth
= reinterpret_cast<_Jv_InterpMethod *> (frame->interp);
return meth->defining_class;
}
#endif // INTERPRETER
gnu::gcj::runtime::MethodRef *ref
= getCompiledMethodRef ((gnu::gcj::RawData *)frame->addr);
if (ref)
return ref->klass;
else
return NULL;
}
java::lang::String*
gnu::gcj::runtime::StackTrace::methodAt (jint n)
{
_Jv_frame_info *frame = GET_FRAME (n);
_Jv_Method *meth = NULL;
#ifdef INTERPRETER
if (frame->interp)
{
meth
= reinterpret_cast<_Jv_InterpMethod *> (frame->interp)
->get_method();
}
#endif // INTERPRETER
if (! meth)
{
gnu::gcj::runtime::MethodRef *ref
= getCompiledMethodRef ((gnu::gcj::RawData *)frame->addr);
if (ref)
meth = (_Jv_Method *)ref->method;
}
return meth
? _Jv_NewStringUtf8Const (meth->name)
: NULL ;
}
void
gnu::gcj::runtime::StackTrace::update(void)
{
jclass klass;
while ((klass = _Jv_PopClass ()))
{
for (int i=0; i<klass->method_count; i++)
{
JvSynchronize sync (map);
_Jv_Method *meth = &(klass->methods[i]);
if (meth->ncode) // i.e. if p is not abstract
{
gnu::gcj::runtime::MethodRef *ref
= new gnu::gcj::runtime::MethodRef
((gnu::gcj::RawData *)meth, klass);
map->put ((java::lang::Object*)(meth->ncode), ref);
}
}
}
}
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