/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/



#include "sal/types.h"


#ifdef SOLARIS

#include <dlfcn.h>
#include <pthread.h>
#include <setjmp.h>
#include <stdio.h>
#include <sys/frame.h>
#include "backtrace.h"

#if defined(SPARC)

#if defined IS_LP64

#define FRAME_PTR_OFFSET 1
#define FRAME_OFFSET     0
#define STACK_BIAS       0x7ff

#else

#define FRAME_PTR_OFFSET 1
#define FRAME_OFFSET     0
#define STACK_BIAS       0

#endif

#elif defined( INTEL )

#define FRAME_PTR_OFFSET 3
#define FRAME_OFFSET     0
#define STACK_BIAS       0

#else

#error Unknown Solaris target platform.

#endif /* defined SPARC or INTEL */


int backtrace( void **buffer, int max_frames )
{
	jmp_buf       ctx;
	long          fpval;
	struct frame *fp;
	int i;

	/* flush register windows */
#ifdef SPARC
	asm("ta 3");
#endif

	/* get stack- and framepointer */
	setjmp(ctx);

	fpval = ((long*)(ctx))[FRAME_PTR_OFFSET];
	fp = (struct frame*)((char*)(fpval) + STACK_BIAS);

	for (i = 0; (i < FRAME_OFFSET) && (fp != NULL); i++)
		fp = (struct frame*)((char*)(fp->fr_savfp) + STACK_BIAS);

	/* iterate through backtrace */
	for (i = 0; (fp != NULL) && (fp->fr_savpc != 0) && (i < max_frames); i++)
	{
		/* saved (prev) frame */
		struct frame * prev = (struct frame*)((char*)(fp->fr_savfp) + STACK_BIAS);

		/* store frame */
		*(buffer++) = (void*)(fp->fr_savpc);

		/* prev frame (w/ stack growing top down) */
		fp = (prev > fp) ? prev : 0;
	}

	/* return number of frames stored */
	return i;
}

void backtrace_symbols_fd( void **buffer, int size, int fd )
{
	FILE	*fp = fdopen( fd, "w" );

	if ( fp )
	{
		void **pFramePtr;

		for ( pFramePtr = buffer; size > 0 && pFramePtr && *pFramePtr; pFramePtr++, size-- )
		{
			Dl_info		dli;
			ptrdiff_t	offset;

			if ( 0 != dladdr( *pFramePtr, &dli ) )
			{
				if ( dli.dli_fname && dli.dli_fbase )
				{
					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
					fprintf( fp, "%s+0x%" SAL_PRI_PTRDIFFT "x", dli.dli_fname, offset );
				}
				if ( dli.dli_sname && dli.dli_saddr )
				{
					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
					fprintf( fp, "(%s+0x%" SAL_PRI_PTRDIFFT "x)", dli.dli_sname, offset );
				}
			}
			fprintf( fp, "[%p]\n", *pFramePtr );
		}

		fflush( fp );
		fclose( fp );
	}
}

#endif /* defined SOLARIS */


#if defined FREEBSD || defined NETBSD
#include <dlfcn.h>
#include <pthread.h>
#include <setjmp.h>
#include <stddef.h>
#include <stdio.h>
#include "backtrace.h"

#define FRAME_PTR_OFFSET 3
#define FRAME_OFFSET 0

int backtrace( void **buffer, int max_frames )
{
	struct frame *fp;
	jmp_buf ctx;
	int i;
	/* get stack- and framepointer */
	setjmp(ctx);
	fp = (struct frame*)(((size_t*)(ctx))[FRAME_PTR_OFFSET]);
	for ( i=0; (i<FRAME_OFFSET) && (fp!=NULL); i++)
		fp = fp->fr_savfp;
	/* iterate through backtrace */
	for (i=0; fp && fp->fr_savpc && i<max_frames; i++)
	{
		/* store frame */
		*(buffer++) = (void *)fp->fr_savpc;
		/* next frame */
		fp=fp->fr_savfp;
	}
	return i;
}

void backtrace_symbols_fd( void **buffer, int size, int fd )
{
	FILE	*fp = fdopen( fd, "w" );

	if ( fp )
	{
		void **pFramePtr;
		for ( pFramePtr = buffer; size > 0 && pFramePtr && *pFramePtr; pFramePtr++, size-- )
		{
			Dl_info		dli;
			ptrdiff_t	offset;

			if ( 0 != dladdr( *pFramePtr, &dli ) )
			{
				if ( dli.dli_fname && dli.dli_fbase )
				{
					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
					fprintf( fp, "%s+0x%" SAL_PRI_PTRDIFFT "x", dli.dli_fname, offset );
				}
				if ( dli.dli_sname && dli.dli_saddr )
				{
					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
					fprintf( fp, "(%s+0x%" SAL_PRI_PTRDIFFT "x)", dli.dli_sname, offset );
				}
			}
			fprintf( fp, "[%p]\n", *pFramePtr );
		}
		fflush( fp );
		fclose( fp );
	}
}
#endif /* defined FREEBSD */

#ifdef LINUX

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <dlfcn.h>
#include <pthread.h>
#include <setjmp.h>
#include <stdio.h>
#include "backtrace.h"

#if defined(SPARC)

#define FRAME_PTR_OFFSET 1
#define FRAME_OFFSET 0

#else

#error Unknown Linux target platform.

#endif /* defined SPARC or INTEL */

typedef int ptrdiff_t;

int backtrace( void **buffer, int max_frames )
{
	struct frame *fp;
	jmp_buf ctx;
	int i;

	/* flush register windows */
#ifdef SPARC
	asm("ta 3");
#endif
	/* get stack- and framepointer */
	setjmp(ctx);
	fp = (struct frame*)(((size_t*)(ctx))[FRAME_PTR_OFFSET]);
	for ( i=0; (i<FRAME_OFFSET) && (fp!=NULL); i++)
		fp = fp->fr_savfp;

	/* iterate through backtrace */
	for (i=0; fp && fp->fr_savpc && i<max_frames; i++)
	{
		/* store frame */
		*(buffer++) = (void *)fp->fr_savpc;
		/* next frame */
		fp=fp->fr_savfp;
	}
	return i;
}

void backtrace_symbols_fd( void **buffer, int size, int fd )
{
	FILE	*fp = fdopen( fd, "w" );

	if ( fp )
	{
		void **pFramePtr;

		for ( pFramePtr = buffer; size > 0 && pFramePtr && *pFramePtr; pFramePtr++, size-- )
		{
			Dl_info		dli;
			ptrdiff_t	offset;

			if ( 0 != dladdr( *pFramePtr, &dli ) )
			{
				if ( dli.dli_fname && dli.dli_fbase )
				{
					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
					fprintf( fp, "%s+0x%" SAL_PRI_PTRDIFFT "x", dli.dli_fname, offset );
				}
				if ( dli.dli_sname && dli.dli_saddr )
				{
					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
					fprintf( fp, "(%s+0x%" SAL_PRI_PTRDIFFT "x)", dli.dli_sname, offset );
				}
			}
			fprintf( fp, "[%p]\n", *pFramePtr );
		}

		fflush( fp );
		fclose( fp );
	}
}

#endif /* defined LINUX */

#if defined( MACOSX )

#include <dlfcn.h>
#include <stdio.h>
#include "backtrace.h"

typedef unsigned	 ptrdiff_t;

/* glib backtrace is only available on MacOsX 10.5 or higher
   so we do it on our own */

int backtrace( void **buffer, int max_frames )
{
	void **frame = (void **)__builtin_frame_address(0);
	void **bp = ( void **)(*frame);
	void *ip = frame[1];
	int	i;

	for ( i = 0; bp && ip && i < max_frames; i++ )
	{
		*(buffer++) = ip;

		ip = bp[1];
		bp = (void**)(bp[0]);
	}

	return i;
}


void backtrace_symbols_fd( void **buffer, int size, int fd )
{
	FILE	*fp = fdopen( fd, "w" );

	if ( fp )
	{
		void **pFramePtr;

		for ( pFramePtr = buffer; size > 0 && pFramePtr && *pFramePtr; pFramePtr++, size-- )
		{
			Dl_info		dli;
			ptrdiff_t	offset;

			if ( 0 != dladdr( *pFramePtr, &dli ) )
			{
				if ( dli.dli_fname && dli.dli_fbase )
				{
					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
					fprintf( fp, "%s+0x%" SAL_PRI_PTRDIFFT "x", dli.dli_fname, offset );
				}
				if ( dli.dli_sname && dli.dli_saddr )
				{
					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
					fprintf( fp, "(%s+0x%" SAL_PRI_PTRDIFFT "x)", dli.dli_sname, offset );
				}
			}
			fprintf( fp, "[%p]\n", *pFramePtr );
		}

		fflush( fp );
		fclose( fp );
	}
}

#endif /* defined MACOSX */