fis-gtm/sr_port/get_frame_place_mcode.c

/****************************************************************
 *								*
 *	Copyright 2001, 2012 Fidelity Information Services, Inc	*
 *								*
 *	This source code contains the intellectual property	*
 *	of its copyright holder(s), and is made available	*
 *	under a license.  If you do not know the terms of	*
 *	the license, please stop and do not read further.	*
 *								*
 ****************************************************************/

#include "mdef.h"

#include "gtm_string.h"

#include <rtnhdr.h>
#include "stack_frame.h"
#include "stringpool.h"
#include "error_trap.h"
#include "objlabel.h"
#include "cache.h"
#include "cache_cleanup.h"
#include "mu_gv_stack_init.h"
#include "gtmimagename.h"

#include "op.h"			/* for op_fntext() prototype */

GBLREF	stack_frame		*frame_pointer;
GBLREF	stack_frame		*error_frame;
GBLREF	spdesc			stringpool;
GBLREF	dollar_ecode_type	dollar_ecode;			/* structure containing $ECODE related information */
GBLREF	enum gtmImageTypes	image_type;

void	get_frame_place_mcode(int level, stack_mode_t mode, int cur_zlevel, mval *result)
{
	int		count;
	stack_frame	*fp;
	unsigned char	pos_str[MAX_ENTRYREF_LEN];
	mval		label;
	mval		routine;
	int		ips;
	int		offset;
	int		s1, s2;
	boolean_t	indirect_frame;
	ihdtyp		*irtnhdr;
	cache_entry	*indce;
	INTPTR_T	*vp;
  	unsigned char	*fpmpc;

	assert(DOLLAR_STACK_PLACE == mode || DOLLAR_STACK_MCODE == mode);
	assert(0 <= level);
	assert(level < cur_zlevel);
	count = cur_zlevel;
	for (fp = frame_pointer;  ; fp = fp->old_frame_pointer)
	{
		if (NULL == fp->old_frame_pointer)
		{
			if (fp->type & SFT_TRIGR)
				/* Have a trigger baseframe, pick up stack continuation frame_pointer stored by base_frame() */
				fp = *(stack_frame **)(fp + 1);
			else
			{	/* Something wrong, just return null or assert if debug mode */
				assert(FALSE);
				result->str.len = 0;
				return;
			}
		}
		assert(NULL != fp);
		if (!(fp->type & SFT_COUNT))
			continue;
		count--;
		if (count == level)
			break;
	}
	fpmpc = fp->mpc;
	if (ADDR_IN_CODE(fpmpc, fp->rvector))
	{
		result->str.addr = (char *)&pos_str[0];
		result->str.len = INTCAST(symb_line(fpmpc, &pos_str[0], 0, fp->rvector) - &pos_str[0]);
		indirect_frame = FALSE;
	} else
	{
		indirect_frame = TRUE;
		pos_str[0] = '@';
		result->str.addr = (char *)&pos_str[0];
		result->str.len = 1;
	}
	if (DOLLAR_STACK_PLACE == mode)
	{
		if (result->str.len)
		{
			s2pool(&result->str);
			assert(((unsigned char *)result->str.addr + result->str.len) == stringpool.free);
		}
	}
	if (DOLLAR_STACK_MCODE == mode)
	{
		if (!indirect_frame)
		{
			if (IS_GTM_IMAGE || (0 < level))
			{
				label.mvtype = MV_STR;
				routine.mvtype = MV_STR;
				result->mvtype = MV_STR;
				label.str.len = result->str.len;
				label.str.addr = (char *)&pos_str[0];
				routine.str.len = 0;
				for (ips = 0, s1 = s2 = -1; ips < result->str.len; ips++)
				{
					if ('+' == pos_str[ips])
					{
						assert((-1 == s1) && (-1 == s2));
						s1 = ips;
					}
					if ('^' == pos_str[ips])
					{
						s2 = ips;
						break;
					}
				}
				if (s2 >= 0)
				{
					routine.str.addr = (char *)&pos_str[s2 + 1];
					routine.str.len = result->str.len - s2 - 1;
					label.str.len = s2;
				}
				offset = 0;
				if (s1 >= 0)
				{
					label.str.len = s1;
					if (s2 < 0)
						s2 = result->str.len;
					for (ips = s1 + 1; ips < s2; ips++)
						offset = offset * 10 + pos_str[ips] - '0';
				}
				op_fntext(&label, offset, &routine, result);
			} else
			{	/* Utility base frame does not have source code */
				result->str.addr = UTIL_BASE_FRAME_CODE;
				result->str.len = STRLEN(UTIL_BASE_FRAME_CODE);
			}
		} else
		{
			/* We think we are looking for an indirect invocation (mpc not in routine expected) but if the
			 * indirect flag is not on, then it's something else and trying to dig out indirect information
			 * is going to cause this process to explode. So some simple validation first and if it is not
			 * an indirect, deal with that fact.
			 */
			if (fp->flags & SFF_INDCE)
			{	/* This is a real indirect - dig a bit to find the cache header and the actual code.
				 * Note, this code picked up from cache_cleanup(). any changes here might need to be
				 * reflected there.
				 */
				vp = (INTPTR_T *)fp->ctxt;
				assert(NULL != vp);
				vp--;
				assertpro(((GTM_OMAGIC << 16) + OBJ_LABEL) == *vp);	/* Validate backward linkage */
				vp--;
				irtnhdr = (ihdtyp *)((char *)vp + *vp);
				indce = irtnhdr->indce;
				assert(NULL != indce);
				assert(0 < indce->refcnt);	/* currently used in the M stack better have a non-zero refcnt */
				s2pool(&indce->src.str);
				result->str = indce->src.str;
				assert(((unsigned char *)result->str.addr + result->str.len) == stringpool.free);
			} else
			{	/* Not a real indirect. The mpc may have been reset by error handling to various assembler
				 * routines or it just may be broken. Whatever the reason, the value to return is that the
				 * code address and thus the code itself is not available so make an appropriate return.
				 */
				result->str.addr = "N/A";
				result->str.len = SIZEOF("N/A") - 1;
			}
		}
	}
	return;
}