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Sweden-Number/debugger/source.c

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C
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/*
* File source.c - source file handling for internal debugger.
*
* Copyright (C) 1997, Eric Youngdale.
*
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <fcntl.h>
#include <sys/stat.h>
#include <limits.h>
#include <string.h>
#include <unistd.h>
#ifndef PATH_MAX
#define PATH_MAX _MAX_PATH
#endif
#include "debugger.h"
struct searchlist
{
char * path;
struct searchlist * next;
};
struct open_filelist
{
char * path;
char * real_path;
struct open_filelist * next;
unsigned int size;
signed int nlines;
unsigned int * linelist;
};
static struct open_filelist * ofiles;
static struct searchlist * listhead;
static char DEBUG_current_sourcefile[PATH_MAX];
static int DEBUG_start_sourceline = -1;
static int DEBUG_end_sourceline = -1;
void
DEBUG_ShowDir(void)
{
struct searchlist * sl;
DEBUG_Printf(DBG_CHN_MESG,"Search list :\n");
for(sl = listhead; sl; sl = sl->next)
{
DEBUG_Printf(DBG_CHN_MESG, "\t%s\n", sl->path);
}
DEBUG_Printf(DBG_CHN_MESG, "\n");
}
void
DEBUG_AddPath(const char * path)
{
struct searchlist * sl;
sl = (struct searchlist *) DBG_alloc(sizeof(struct searchlist));
if( sl == NULL )
{
return;
}
sl->next = listhead;
sl->path = DBG_strdup(path);
listhead = sl;
}
void
DEBUG_NukePath(void)
{
struct searchlist * sl;
struct searchlist * nxt;
for(sl = listhead; sl; sl = nxt)
{
nxt = sl->next;
DBG_free(sl->path);
DBG_free(sl);
}
listhead = NULL;
}
static
int
DEBUG_DisplaySource(char * sourcefile, int start, int end)
{
char * addr;
char buffer[1024];
int fd;
int i;
struct open_filelist * ol;
int nlines;
char * basename = NULL;
char * pnt;
int rtn;
struct searchlist * sl;
struct stat statbuf;
int status;
char tmppath[PATH_MAX];
/*
* First see whether we have the file open already. If so, then
* use that, otherwise we have to try and open it.
*/
for(ol = ofiles; ol; ol = ol->next)
{
if( strcmp(ol->path, sourcefile) == 0 )
{
break;
}
}
if( ol == NULL )
{
/*
* Try again, stripping the path from the opened file.
*/
basename = strrchr(sourcefile, '\\' );
if ( !basename )
basename = strrchr(sourcefile, '/' );
if ( !basename )
basename = sourcefile;
else
basename++;
for(ol = ofiles; ol; ol = ol->next)
{
if( strcmp(ol->path, basename) == 0 )
{
break;
}
}
}
if( ol == NULL )
{
/*
* Crapola. We need to try and open the file.
*/
status = stat(sourcefile, &statbuf);
if( status != -1 )
{
strcpy(tmppath, sourcefile);
}
else if( (status = stat(basename, &statbuf)) != -1 )
{
strcpy(tmppath, basename);
}
else
{
for(sl = listhead; sl; sl = sl->next)
{
strcpy(tmppath, sl->path);
if( tmppath[strlen(tmppath)-1] != '/' )
{
strcat(tmppath, "/");
}
/*
* Now append the base file name.
*/
strcat(tmppath, basename);
status = stat(tmppath, &statbuf);
if( status != -1 )
{
break;
}
}
if( sl == NULL )
{
char zbuf[256];
/*
* Still couldn't find it. Ask user for path to add.
*/
sprintf(zbuf, "Enter path to file '%s': ", sourcefile);
DEBUG_ReadLine(zbuf, tmppath, sizeof(tmppath), FALSE, FALSE);
if( tmppath[strlen(tmppath)-1] == '\n' )
{
tmppath[strlen(tmppath)-1] = '\0';
}
if( tmppath[strlen(tmppath)-1] != '/' )
{
strcat(tmppath, "/");
}
/*
* Now append the base file name.
*/
strcat(tmppath, basename);
status = stat(tmppath, &statbuf);
if( status == -1 )
{
/*
* OK, I guess the user doesn't really want to see it
* after all.
*/
ol = (struct open_filelist *) DBG_alloc(sizeof(*ol));
ol->path = DBG_strdup(sourcefile);
ol->real_path = NULL;
ol->next = ofiles;
ol->nlines = 0;
ol->linelist = NULL;
ofiles = ol;
DEBUG_Printf(DBG_CHN_MESG,"Unable to open file %s\n", tmppath);
return FALSE;
}
}
}
/*
* Create header for file.
*/
ol = (struct open_filelist *) DBG_alloc(sizeof(*ol));
ol->path = DBG_strdup(sourcefile);
ol->real_path = DBG_strdup(tmppath);
ol->next = ofiles;
ol->nlines = 0;
ol->linelist = NULL;
ol->size = statbuf.st_size;
ofiles = ol;
/*
* Now open and map the file.
*/
fd = open(tmppath, O_RDONLY);
if( fd == -1 )
{
return FALSE;
}
addr = mmap(0, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if( addr == (char *) -1 )
{
return FALSE;
}
/*
* Now build up the line number mapping table.
*/
ol->nlines = 1;
pnt = addr;
while(pnt < addr + ol->size )
{
if( *pnt++ == '\n' )
{
ol->nlines++;
}
}
ol->nlines++;
ol->linelist = (unsigned int*) DBG_alloc( ol->nlines * sizeof(unsigned int) );
nlines = 0;
pnt = addr;
ol->linelist[nlines++] = 0;
while(pnt < addr + ol->size )
{
if( *pnt++ == '\n' )
{
ol->linelist[nlines++] = pnt - addr;
}
}
ol->linelist[nlines++] = pnt - addr;
}
else
{
/*
* We know what the file is, we just need to reopen it and remap it.
*/
fd = open(ol->real_path, O_RDONLY);
if( fd == -1 )
{
return FALSE;
}
addr = mmap(0, ol->size, PROT_READ, MAP_PRIVATE, fd, 0);
if( addr == (char *) -1 )
{
return FALSE;
}
}
/*
* All we need to do is to display the source lines here.
*/
rtn = FALSE;
for(i=start - 1; i <= end - 1; i++)
{
if( i < 0 || i >= ol->nlines - 1)
{
continue;
}
rtn = TRUE;
memset(&buffer, 0, sizeof(buffer));
if( ol->linelist[i+1] != ol->linelist[i] )
{
memcpy(&buffer, addr + ol->linelist[i],
(ol->linelist[i+1] - ol->linelist[i]) - 1);
}
DEBUG_Printf(DBG_CHN_MESG,"%d\t%s\n", i + 1, buffer);
}
munmap(addr, ol->size);
close(fd);
return rtn;
}
void
DEBUG_List(struct list_id * source1, struct list_id * source2,
int delta)
{
int end;
int rtn;
int start;
char * sourcefile;
/*
* We need to see what source file we need. Hopefully we only have
* one specified, otherwise we might as well punt.
*/
if( source1 != NULL
&& source2 != NULL
&& source1->sourcefile != NULL
&& source2->sourcefile != NULL
&& strcmp(source1->sourcefile, source2->sourcefile) != 0 )
{
DEBUG_Printf(DBG_CHN_MESG, "Ambiguous source file specification.\n");
return;
}
sourcefile = NULL;
if( source1 != NULL && source1->sourcefile != NULL )
{
sourcefile = source1->sourcefile;
}
if( sourcefile == NULL
&& source2 != NULL
&& source2->sourcefile != NULL )
{
sourcefile = source2->sourcefile;
}
if( sourcefile == NULL )
{
sourcefile = (char *) &DEBUG_current_sourcefile;
}
if( sourcefile == NULL )
{
DEBUG_Printf(DBG_CHN_MESG, "No source file specified.\n");
return;
}
/*
* Now figure out the line number range to be listed.
*/
start = -1;
end = -1;
if( source1 != NULL )
{
start = source1->line;
}
if( source2 != NULL )
{
end = source2->line;
}
if( start == -1 && end == -1 )
{
if( delta < 0 )
{
end = DEBUG_start_sourceline;
start = end + delta;
}
else
{
start = DEBUG_end_sourceline;
end = start + delta;
}
}
else if( start == -1 )
{
start = end + delta;
}
else if (end == -1)
{
end = start + delta;
}
/*
* Now call this function to do the dirty work.
*/
rtn = DEBUG_DisplaySource(sourcefile, start, end);
if( sourcefile != (char *) &DEBUG_current_sourcefile )
{
strcpy(DEBUG_current_sourcefile, sourcefile);
}
DEBUG_start_sourceline = start;
DEBUG_end_sourceline = end;
}
DBG_ADDR DEBUG_LastDisassemble={0,0};
BOOL DEBUG_DisassembleInstruction(DBG_ADDR *addr)
{
char ch;
BOOL ret = TRUE;
DEBUG_PrintAddress(addr, DEBUG_CurrThread->dbg_mode, TRUE);
DEBUG_Printf(DBG_CHN_MESG, ": ");
if (!DEBUG_READ_MEM_VERBOSE((void*)DEBUG_ToLinear(addr), &ch, sizeof(ch))) {
DEBUG_Printf(DBG_CHN_MESG, "-- no code --");
ret = FALSE;
} else {
DEBUG_Disasm(addr, TRUE);
}
DEBUG_Printf(DBG_CHN_MESG,"\n");
return ret;
}
void
DEBUG_Disassemble(const DBG_VALUE *xstart,const DBG_VALUE *xend,int offset)
{
int i;
DBG_ADDR last;
DBG_VALUE end,start;
if (xstart) {
start = *xstart;
DEBUG_GrabAddress(&start, TRUE);
}
if (xend) {
end = *xend;
DEBUG_GrabAddress(&end, TRUE);
}
if (!xstart && !xend) {
last = DEBUG_LastDisassemble;
if (!last.seg && !last.off)
DEBUG_GetCurrentAddress( &last );
for (i=0;i<offset;i++)
if (!DEBUG_DisassembleInstruction(&last)) break;
DEBUG_LastDisassemble = last;
return;
}
last = start.addr;
if (!xend) {
for (i=0;i<offset;i++)
if (!DEBUG_DisassembleInstruction(&last)) break;
DEBUG_LastDisassemble = last;
return;
}
while (last.off <= end.addr.off)
if (!DEBUG_DisassembleInstruction(&last)) break;
DEBUG_LastDisassemble = last;
return;
}
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