Category : C Source Code
Archive   : DMAKE38B.ZIP
Filename : DBUG.C

 
Output of file : DBUG.C contained in archive : DMAKE38B.ZIP
/******************************************************************************
* *
* N O T I C E *
* *
* Copyright Abandoned, 1987, Fred Fish *
* *
* *
* This previously copyrighted work has been placed into the public *
* domain by the author and may be freely used for any purpose, *
* private or commercial. *
* *
* Because of the number of inquiries I was receiving about the use *
* of this product in commercially developed works I have decided to *
* simply make it public domain to further its unrestricted use. I *
* specifically would be most happy to see this material become a *
* part of the standard Unix distributions by AT&T and the Berkeley *
* Computer Science Research Group, and a standard part of the GNU *
* system from the Free Software Foundation. *
* *
* I would appreciate it, as a courtesy, if this notice is left in *
* all copies and derivative works. Thank you. *
* *
* The author makes no warranty of any kind with respect to this *
* product and explicitly disclaims any implied warranties of mer- *
* chantability or fitness for any particular purpose. *
* *
******************************************************************************
*/


/*
* FILE
*
* dbug.c runtime support routines for dbug package
*
* SCCS
*
* @(#)dbug.c 1.19 9/5/87
*
* DESCRIPTION
*
* These are the runtime support routines for the dbug package.
* The dbug package has two main components; the user include
* file containing various macro definitions, and the runtime
* support routines which are called from the macro expansions.
*
* Externally visible functions in the runtime support module
* use the naming convention pattern "_db_xx...xx_", thus
* they are unlikely to collide with user defined function names.
*
* AUTHOR(S)
*
* Fred Fish (base code)
* (Currently at Motorola Computer Division, Tempe, Az.)
* hao!noao!mcdsun!fnf
* (602) 438-3614
*
* Binayak Banerjee (profiling enhancements)
* seismo!bpa!sjuvax!bbanerje
*/


#include
#ifdef amiga
#define AMIGA
#endif

#ifdef AMIGA
#define HZ (50) /* Probably in some header somewhere */
#endif

/*
* Manifest constants that should not require any changes.
*/

#define FALSE 0 /* Boolean FALSE */
#define TRUE 1 /* Boolean TRUE */
#define EOS '\000' /* End Of String marker */

/*
* Manifest constants which may be "tuned" if desired.
*/

#define PRINTBUF 1024 /* Print buffer size */
#define INDENT 4 /* Indentation per trace level */
#define MAXDEPTH 200 /* Maximum trace depth default */

/*
* The following flags are used to determine which
* capabilities the user has enabled with the state
* push macro.
*/

#define TRACE_ON 000001 /* Trace enabled */
#define DEBUG_ON 000002 /* Debug enabled */
#define FILE_ON 000004 /* File name print enabled */
#define LINE_ON 000010 /* Line number print enabled */
#define DEPTH_ON 000020 /* Function nest level print enabled */
#define PROCESS_ON 000040 /* Process name print enabled */
#define NUMBER_ON 000100 /* Number each line of output */
#define PROFILE_ON 000200 /* Print out profiling code */

#define TRACING (stack -> flags & TRACE_ON)
#define DEBUGGING (stack -> flags & DEBUG_ON)
#define PROFILING (stack -> flags & PROFILE_ON)
#define STREQ(a,b) (strcmp(a,b) == 0)

/*
* Typedefs to make things more obvious.
*/

#define VOID void /* Can't use typedef for most compilers */
typedef int BOOLEAN;

/*
* Make it easy to change storage classes if necessary.
*/

#define LOCAL static /* Names not needed by outside world */
#define IMPORT extern /* Names defined externally */
#define EXPORT /* Allocated here, available globally */
#define AUTO auto /* Names to be allocated on stack */
#define REGISTER register /* Names to be placed in registers */

/*
* The following define is for the variable arguments kluge, see
* the comments in _db_doprnt_().
*
* Also note that the longer this list, the less prone to failing
* on long argument lists, but the more stuff that must be moved
* around for each call to the runtime support routines. The
* length may really be critical if the machine convention is
* to pass arguments in registers.
*
* Note that the default define allows up to 16 integral arguments,
* or 8 floating point arguments (doubles), on most machines.
*
* Someday this may be replaced with true varargs support, when
* ANSI C has had time to take root.
*/

#define ARGLIST a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15

/*
* The default file for profiling. Could also add another flag
* (G?) which allowed the user to specify this.
*/

#define PROF_FILE "dbugmon.out"

/*
* Variables which are available externally but should only
* be accessed via the macro package facilities.
*/

EXPORT FILE *_db_fp_ = stderr; /* Output stream, default stderr */
EXPORT FILE *_db_pfp_ = (FILE *)0; /* Profile stream, 'dbugmon.out' */
EXPORT char *_db_process_ = "dbug"; /* Pointer to process name; argv[0] */
EXPORT BOOLEAN _db_on_ = FALSE; /* TRUE if debugging currently on */
EXPORT BOOLEAN _db_pon_ = FALSE; /* TRUE if debugging currently on */

/*
* Externally supplied functions.
*/

#ifdef unix /* Only needed for unix */
IMPORT VOID perror (); /* Print system/library error */
IMPORT int chown (); /* Change owner of a file */
IMPORT int getgid (); /* Get real group id */
IMPORT int getuid (); /* Get real user id */
IMPORT int access (); /* Test file for access */
#else
#if !(AMIGA || LATTICE || __TURBOC__)
LOCAL VOID perror (); /* Fake system/library error print routine */
#endif
#endif

# if BSD4_3 || sun
IMPORT int getrusage ();
#endif

IMPORT int atoi (); /* Convert ascii to integer */
IMPORT VOID exit (); /* Terminate execution */
IMPORT int fclose (); /* Close a stream */
IMPORT FILE *fopen (); /* Open a stream */
#if !defined(__BORLANDC__)
IMPORT int fprintf (); /* Formatted print on file */
#endif
IMPORT VOID free ();
IMPORT char *malloc (); /* Allocate memory */
IMPORT int strcmp (); /* Compare strings */
IMPORT char *strcpy (); /* Copy strings around */
IMPORT int strlen (); /* Find length of string */

#ifndef fflush /* This is sometimes a macro */
IMPORT int fflush (); /* Flush output for stream */
#endif


/*
* The user may specify a list of functions to trace or
* debug. These lists are kept in a linear linked list,
* a very simple implementation.
*/

struct link {
char *string; /* Pointer to link's contents */
struct link *next_link; /* Pointer to the next link */
};


/*
* Debugging states can be pushed or popped off of a
* stack which is implemented as a linked list. Note
* that the head of the list is the current state and the
* stack is pushed by adding a new state to the head of the
* list or popped by removing the first link.
*/

struct state {
int flags; /* Current state flags */
int maxdepth; /* Current maximum trace depth */
unsigned int delay; /* Delay after each output line */
int level; /* Current function nesting level */
FILE *out_file; /* Current output stream */
FILE *prof_file; /* Current profiling stream */
struct link *functions; /* List of functions */
struct link *p_functions; /* List of profiled functions */
struct link *keywords; /* List of debug keywords */
struct link *processes; /* List of process names */
struct state *next_state; /* Next state in the list */
};

LOCAL struct state *stack = NULL; /* Linked list of stacked states */

/*
* Local variables not seen by user.
*/

LOCAL int lineno = 0; /* Current debugger output line number */
LOCAL char *func = "?func"; /* Name of current user function */
LOCAL char *file = "?file"; /* Name of current user file */
LOCAL BOOLEAN init_done = FALSE;/* Set to TRUE when initialization done */

/*#if unix || AMIGA || M_I86*/
LOCAL int jmplevel; /* Remember nesting level at setjmp () */
LOCAL char *jmpfunc; /* Remember current function for setjmp */
LOCAL char *jmpfile; /* Remember current file for setjmp */
/*#endif*/

LOCAL struct link *ListParse ();/* Parse a debug command string */
LOCAL char *StrDup (); /* Make a fresh copy of a string */
LOCAL VOID OpenFile (); /* Open debug output stream */
LOCAL VOID OpenProfile (); /* Open profile output stream */
LOCAL VOID CloseFile (); /* Close debug output stream */
LOCAL VOID PushState (); /* Push current debug state */
LOCAL VOID ChangeOwner (); /* Change file owner and group */
LOCAL BOOLEAN DoTrace (); /* Test for tracing enabled */
LOCAL BOOLEAN Writable (); /* Test to see if file is writable */
LOCAL unsigned long Clock (); /* Return current user time (ms) */
LOCAL char *DbugMalloc (); /* Allocate memory for runtime support */
LOCAL char *BaseName (); /* Remove leading pathname components */
LOCAL VOID DoPrefix (); /* Print debugger line prefix */
LOCAL VOID FreeList (); /* Free memory from linked list */
LOCAL VOID Indent (); /* Indent line to specified indent */

/* Supplied in Sys V runtime environ */
LOCAL char *strtok (); /* Break string into tokens */
LOCAL char *strrchr (); /* Find last occurance of char */

/*
* The following local variables are used to hold the state information
* between the call to _db_pargs_() and _db_doprnt_(), during
* expansion of the DBUG_PRINT macro. This is the only macro
* that currently uses these variables. The DBUG_PRINT macro
* and the new _db_doprnt_() routine replace the older DBUG_N macros
* and their corresponding runtime support routine _db_printf_().
*
* These variables are currently used only by _db_pargs_() and
* _db_doprnt_().
*/

LOCAL int u_line = 0; /* User source code line number */
LOCAL char *u_keyword = "?"; /* Keyword for current macro */

/*
* Miscellaneous printf format strings.
*/

#define ERR_MISSING_RETURN "%s: missing DBUG_RETURN or DBUG_VOID_RETURN macro in function \"%s\"\n"
#define ERR_OPEN "%s: can't open debug output stream \"%s\": "
#define ERR_CLOSE "%s: can't close debug file: "
#define ERR_ABORT "%s: debugger aborting because %s\n"
#define ERR_CHOWN "%s: can't change owner/group of \"%s\": "
#define ERR_PRINTF "%s: obsolete object file for '%s', please recompile!\n"

/*
* Macros and defines for testing file accessibility under UNIX.
*/

#ifdef unix
# define A_EXISTS 00 /* Test for file existance */
# define A_EXECUTE 01 /* Test for execute permission */
# define A_WRITE 02 /* Test for write access */
# define A_READ 03 /* Test for read access */
# define EXISTS(pathname) (access (pathname, A_EXISTS) == 0)
# define WRITABLE(pathname) (access (pathname, A_WRITE) == 0)
#else
# define EXISTS(pathname) (FALSE) /* Assume no existance */
#endif

/*
* Translate some calls among different systems.
*/

#ifdef unix
# define XDelay sleep
IMPORT unsigned int sleep (); /* Pause for given number of seconds */
#endif

#ifdef AMIGA
IMPORT int XDelay (); /* Pause for given number of ticks */
#endif


/*
* FUNCTION
*
* _db_push_ push current debugger state and set up new one
*
* SYNOPSIS
*
* VOID _db_push_ (control)
* char *control;
*
* DESCRIPTION
*
* Given pointer to a debug control string in "control", pushes
* the current debug state, parses the control string, and sets
* up a new debug state.
*
* The only attribute of the new state inherited from the previous
* state is the current function nesting level. This can be
* overridden by using the "r" flag in the control string.
*
* The debug control string is a sequence of colon separated fields
* as follows:
*
* ::...:
*
* Each field consists of a mandatory flag character followed by
* an optional "," and comma separated list of modifiers:
*
* flag[,modifier,modifier,...,modifier]
*
* The currently recognized flag characters are:
*
* d Enable output from DBUG_ macros for
* for the current state. May be followed
* by a list of keywords which selects output
* only for the DBUG macros with that keyword.
* A null list of keywords implies output for
* all macros.
*
* D Delay after each debugger output line.
* The argument is the number of tenths of seconds
* to delay, subject to machine capabilities.
* I.E. -#D,20 is delay two seconds.
*
* f Limit debugging and/or tracing, and profiling to the
* list of named functions. Note that a null list will
* disable all functions. The appropriate "d" or "t"
* flags must still be given, this flag only limits their
* actions if they are enabled.
*
* F Identify the source file name for each
* line of debug or trace output.
*
* g Enable profiling. Create a file called 'dbugmon.out'
* containing information that can be used to profile
* the program. May be followed by a list of keywords
* that select profiling only for the functions in that
* list. A null list implies that all functions are
* considered.
*
* L Identify the source file line number for
* each line of debug or trace output.
*
* n Print the current function nesting depth for
* each line of debug or trace output.
*
* N Number each line of dbug output.
*
* p Limit debugger actions to specified processes.
* A process must be identified with the
* DBUG_PROCESS macro and match one in the list
* for debugger actions to occur.
*
* P Print the current process name for each
* line of debug or trace output.
*
* r When pushing a new state, do not inherit
* the previous state's function nesting level.
* Useful when the output is to start at the
* left margin.
*
* t Enable function call/exit trace lines.
* May be followed by a list (containing only
* one modifier) giving a numeric maximum
* trace level, beyond which no output will
* occur for either debugging or tracing
* macros. The default is a compile time
* option.
*
* Some examples of debug control strings which might appear
* on a shell command line (the "-#" is typically used to
* introduce a control string to an application program) are:
*
* -#d:t
* -#d:f,main,subr1:F:L:t,20
* -#d,input,output,files:n
*
* For convenience, any leading "-#" is stripped off.
*
*/


VOID _db_push_ (control)
char *control;
{
REGISTER char *scan;
REGISTER struct link *temp;

if (control && *control == '-') {
if (*++control == '#') {
control++;
}
}
control = StrDup (control);
PushState ();
scan = strtok (control, ":");
for (; scan != NULL; scan = strtok ((char *)NULL, ":")) {
switch (*scan++) {
case 'd':
_db_on_ = TRUE;
stack -> flags |= DEBUG_ON;
if (*scan++ == ',') {
stack -> keywords = ListParse (scan);
}
break;
case 'D':
stack -> delay = 0;
if (*scan++ == ',') {
temp = ListParse (scan);
stack -> delay = DelayArg (atoi (temp -> string));
FreeList (temp);
}
break;
case 'f':
if (*scan++ == ',') {
stack -> functions = ListParse (scan);
}
break;
case 'F':
stack -> flags |= FILE_ON;
break;
case 'g':
_db_pon_ = TRUE;
OpenProfile(PROF_FILE);
stack -> flags |= PROFILE_ON;
if (*scan++ == ',') {
stack -> p_functions = ListParse (scan);
}
break;
case 'L':
stack -> flags |= LINE_ON;
break;
case 'n':
stack -> flags |= DEPTH_ON;
break;
case 'N':
stack -> flags |= NUMBER_ON;
break;
case 'o':
if (*scan++ == ',') {
temp = ListParse (scan);
OpenFile (temp -> string);
FreeList (temp);
} else {
OpenFile ("-");
}
break;
case 'p':
if (*scan++ == ',') {
stack -> processes = ListParse (scan);
}
break;
case 'P':
stack -> flags |= PROCESS_ON;
break;
case 'r':
stack -> level = 0;
break;
case 't':
stack -> flags |= TRACE_ON;
if (*scan++ == ',') {
temp = ListParse (scan);
stack -> maxdepth = atoi (temp -> string);
FreeList (temp);
}
break;
}
}
free (control);
}



/*
* FUNCTION
*
* _db_pop_ pop the debug stack
*
* DESCRIPTION
*
* Pops the debug stack, returning the debug state to its
* condition prior to the most recent _db_push_ invocation.
* Note that the pop will fail if it would remove the last
* valid state from the stack. This prevents user errors
* in the push/pop sequence from screwing up the debugger.
* Maybe there should be some kind of warning printed if the
* user tries to pop too many states.
*
*/

VOID _db_pop_ ()
{
REGISTER struct state *discard;

discard = stack;
if (discard != NULL && discard -> next_state != NULL) {
stack = discard -> next_state;
_db_fp_ = stack -> out_file;
_db_pfp_ = stack -> prof_file;
if (discard -> keywords != NULL) {
FreeList (discard -> keywords);
}
if (discard -> functions != NULL) {
FreeList (discard -> functions);
}
if (discard -> processes != NULL) {
FreeList (discard -> processes);
}
if (discard -> p_functions != NULL) {
FreeList (discard -> p_functions);
}
CloseFile (discard -> out_file);
CloseFile (discard -> prof_file);
free ((char *) discard);
}
}


/*
* FUNCTION
*
* _db_enter_ process entry point to user function
*
* SYNOPSIS
*
* VOID _db_enter_ (_func_, _file_, _line_, _sfunc_, _sfile_, _slevel_)
* char *_func_; points to current function name
* char *_file_; points to current file name
* int _line_; called from source line number
* char **_sfunc_; save previous _func_
* char **_sfile_; save previous _file_
* int *_slevel_; save previous nesting level
*
* DESCRIPTION
*
* Called at the beginning of each user function to tell
* the debugger that a new function has been entered.
* Note that the pointers to the previous user function
* name and previous user file name are stored on the
* caller's stack (this is why the ENTER macro must be
* the first "executable" code in a function, since it
* allocates these storage locations). The previous nesting
* level is also stored on the callers stack for internal
* self consistency checks.
*
* Also prints a trace line if tracing is enabled and
* increments the current function nesting depth.
*
* Note that this mechanism allows the debugger to know
* what the current user function is at all times, without
* maintaining an internal stack for the function names.
*
*/

VOID _db_enter_ (_func_, _file_, _line_, _sfunc_, _sfile_, _slevel_)
char *_func_;
char *_file_;
int _line_;
char **_sfunc_;
char **_sfile_;
int *_slevel_;
{
if (!init_done) {
_db_push_ ("");
}
*_sfunc_ = func;
*_sfile_ = file;
func = _func_;
file = BaseName (_file_);
stack -> level++;
*_slevel_ = stack -> level;
if (DoProfile ()) {
(VOID) fprintf (_db_pfp_, "%s\tE\t%ld\n",func, Clock());
(VOID) fflush (_db_pfp_);
}
if (DoTrace ()) {
DoPrefix (_line_);
Indent (stack -> level);
(VOID) fprintf (_db_fp_, ">%s\n", func);
(VOID) fflush (_db_fp_);
(VOID) XDelay (stack -> delay);
}
}


/*
* FUNCTION
*
* _db_return_ process exit from user function
*
* SYNOPSIS
*
* VOID _db_return_ (_line_, _sfunc_, _sfile_, _slevel_)
* int _line_; current source line number
* char **_sfunc_; where previous _func_ is to be retrieved
* char **_sfile_; where previous _file_ is to be retrieved
* int *_slevel_; where previous level was stashed
*
* DESCRIPTION
*
* Called just before user function executes an explicit or implicit
* return. Prints a trace line if trace is enabled, decrements
* the current nesting level, and restores the current function and
* file names from the defunct function's stack.
*
*/

VOID _db_return_ (_line_, _sfunc_, _sfile_, _slevel_)
int _line_;
char **_sfunc_;
char **_sfile_;
int *_slevel_;
{
if (!init_done) {
_db_push_ ("");
}
if (stack -> level != *_slevel_ && (TRACING || DEBUGGING || PROFILING)) {
(VOID) fprintf (_db_fp_, ERR_MISSING_RETURN, _db_process_, func);
(VOID) XDelay (stack -> delay);
} else if (DoProfile ()) {
(VOID) fprintf (_db_pfp_, "%s\tX\t%ld\n", func, Clock());
(VOID) XDelay (stack -> delay);
} else if (DoTrace ()) {
DoPrefix (_line_);
Indent (stack -> level);
(VOID) fprintf (_db_fp_, "<%s\n", func);
(VOID) XDelay (stack -> delay);
}
(VOID) fflush (_db_fp_);
stack -> level = *_slevel_ - 1;
func = *_sfunc_;
file = *_sfile_;
}


/*
* FUNCTION
*
* _db_pargs_ log arguments for subsequent use by _db_doprnt_()
*
* SYNOPSIS
*
* VOID _db_pargs_ (_line_, keyword)
* int _line_;
* char *keyword;
*
* DESCRIPTION
*
* The new universal printing macro DBUG_PRINT, which replaces
* all forms of the DBUG_N macros, needs two calls to runtime
* support routines. The first, this function, remembers arguments
* that are used by the subsequent call to _db_doprnt_().
*
*/

VOID _db_pargs_ (_line_, keyword)
int _line_;
char *keyword;
{
u_line = _line_;
u_keyword = keyword;
}


/*
* FUNCTION
*
* _db_doprnt_ handle print of debug lines
*
* SYNOPSIS
*
* VOID _db_doprnt_ (format, ARGLIST)
* char *format;
* long ARGLIST;
*
* DESCRIPTION
*
* When invoked via one of the DBUG macros, tests the current keyword
* set by calling _db_pargs_() to see if that macro has been selected
* for processing via the debugger control string, and if so, handles
* printing of the arguments via the format string. The line number
* of the DBUG macro in the source is found in u_line.
*
* Note that the format string SHOULD NOT include a terminating
* newline, this is supplied automatically.
*
* NOTES
*
* This runtime support routine replaces the older _db_printf_()
* routine which is temporarily kept around for compatibility.
*
* The rather ugly argument declaration is to handle some
* magic with respect to the number of arguments passed
* via the DBUG macros. The current maximum is 3 arguments
* (not including the keyword and format strings).
*
* The new facility is not yet common enough to
* convert to it quite yet...
*
*/

/*VARARGS1*/
VOID _db_doprnt_ (format, ARGLIST)
char *format;
long ARGLIST;
{
if (_db_keyword_ (u_keyword)) {
DoPrefix (u_line);
if (TRACING) {
Indent (stack -> level + 1);
} else {
(VOID) fprintf (_db_fp_, "%s: ", func);
}
(VOID) fprintf (_db_fp_, "%s: ", u_keyword);
(VOID) fprintf (_db_fp_, format, ARGLIST);
(VOID) fprintf (_db_fp_, "\n");
(VOID) fflush (_db_fp_);
(VOID) XDelay (stack -> delay);
}
}

/*
* The following routine is kept around temporarily for compatibility
* with older objects that were compiled with the DBUG_N macro form
* of the print routine. It will print a warning message on first
* usage. It will go away in subsequent releases...
*/

/*VARARGS3*/
VOID _db_printf_ (_line_, keyword, format, ARGLIST)
int _line_;
char *keyword, *format;
long ARGLIST;
{
static BOOLEAN firsttime = TRUE;

if (firsttime) {
(VOID) fprintf (stderr, ERR_PRINTF, _db_process_, file);
firsttime = FALSE;
}
_db_pargs_ (_line_, keyword);
_db_doprnt_ (format, ARGLIST);
}


/*
* FUNCTION
*
* ListParse parse list of modifiers in debug control string
*
* SYNOPSIS
*
* LOCAL struct link *ListParse (ctlp)
* char *ctlp;
*
* DESCRIPTION
*
* Given pointer to a comma separated list of strings in "cltp",
* parses the list, building a list and returning a pointer to it.
* The original comma separated list is destroyed in the process of
* building the linked list, thus it had better be a duplicate
* if it is important.
*
* Note that since each link is added at the head of the list,
* the final list will be in "reverse order", which is not
* significant for our usage here.
*
*/

LOCAL struct link *ListParse (ctlp)
char *ctlp;
{
REGISTER char *start;
REGISTER struct link *new;
REGISTER struct link *head;

head = NULL;
while (*ctlp != EOS) {
start = ctlp;
while (*ctlp != EOS && *ctlp != ',') {
ctlp++;
}
if (*ctlp == ',') {
*ctlp++ = EOS;
}
new = (struct link *) DbugMalloc (sizeof (struct link));
new -> string = StrDup (start);
new -> next_link = head;
head = new;
}
return (head);
}


/*
* FUNCTION
*
* InList test a given string for member of a given list
*
* SYNOPSIS
*
* LOCAL BOOLEAN InList (linkp, cp)
* struct link *linkp;
* char *cp;
*
* DESCRIPTION
*
* Tests the string pointed to by "cp" to determine if it is in
* the list pointed to by "linkp". Linkp points to the first
* link in the list. If linkp is NULL then the string is treated
* as if it is in the list (I.E all strings are in the null list).
* This may seem rather strange at first but leads to the desired
* operation if no list is given. The net effect is that all
* strings will be accepted when there is no list, and when there
* is a list, only those strings in the list will be accepted.
*
*/

LOCAL BOOLEAN InList (linkp, cp)
struct link *linkp;
char *cp;
{
REGISTER struct link *scan;
REGISTER BOOLEAN accept;

if (linkp == NULL) {
accept = TRUE;
} else {
accept = FALSE;
for (scan = linkp; scan != NULL; scan = scan -> next_link) {
if (STREQ (scan -> string, cp)) {
accept = TRUE;
break;
}
}
}
return (accept);
}


/*
* FUNCTION
*
* PushState push current state onto stack and set up new one
*
* SYNOPSIS
*
* LOCAL VOID PushState ()
*
* DESCRIPTION
*
* Pushes the current state on the state stack, and initializes
* a new state. The only parameter inherited from the previous
* state is the function nesting level. This action can be
* inhibited if desired, via the "r" flag.
*
* The state stack is a linked list of states, with the new
* state added at the head. This allows the stack to grow
* to the limits of memory if necessary.
*
*/

LOCAL VOID PushState ()
{
REGISTER struct state *new;

new = (struct state *) DbugMalloc (sizeof (struct state));
new -> flags = 0;
new -> delay = 0;
new -> maxdepth = MAXDEPTH;
if (stack != NULL) {
new -> level = stack -> level;
} else {
new -> level = 0;
}
new -> out_file = stderr;
new -> functions = NULL;
new -> p_functions = NULL;
new -> keywords = NULL;
new -> processes = NULL;
new -> next_state = stack;
stack = new;
init_done = TRUE;
}


/*
* FUNCTION
*
* DoTrace check to see if tracing is current enabled
*
* SYNOPSIS
*
* LOCAL BOOLEAN DoTrace ()
*
* DESCRIPTION
*
* Checks to see if tracing is enabled based on whether the
* user has specified tracing, the maximum trace depth has
* not yet been reached, the current function is selected,
* and the current process is selected. Returns TRUE if
* tracing is enabled, FALSE otherwise.
*
*/

LOCAL BOOLEAN DoTrace ()
{
REGISTER BOOLEAN trace;

trace = FALSE;
if (TRACING) {
if (stack -> level <= stack -> maxdepth) {
if (InList (stack -> functions, func)) {
if (InList (stack -> processes, _db_process_)) {
trace = TRUE;
}
}
}
}
return (trace);
}


/*
* FUNCTION
*
* DoProfile check to see if profiling is current enabled
*
* SYNOPSIS
*
* LOCAL BOOLEAN DoProfile ()
*
* DESCRIPTION
*
* Checks to see if profiling is enabled based on whether the
* user has specified profiling, the maximum trace depth has
* not yet been reached, the current function is selected,
* and the current process is selected. Returns TRUE if
* profiling is enabled, FALSE otherwise.
*
*/

LOCAL BOOLEAN DoProfile ()
{
REGISTER BOOLEAN profile;

profile = FALSE;
if (PROFILING) {
if (stack -> level <= stack -> maxdepth) {
if (InList (stack -> p_functions, func)) {
if (InList (stack -> processes, _db_process_)) {
profile = TRUE;
}
}
}
}
return (profile);
}


/*
* FUNCTION
*
* _db_keyword_ test keyword for member of keyword list
*
* SYNOPSIS
*
* BOOLEAN _db_keyword_ (keyword)
* char *keyword;
*
* DESCRIPTION
*
* Test a keyword to determine if it is in the currently active
* keyword list. As with the function list, a keyword is accepted
* if the list is null, otherwise it must match one of the list
* members. When debugging is not on, no keywords are accepted.
* After the maximum trace level is exceeded, no keywords are
* accepted (this behavior subject to change). Additionally,
* the current function and process must be accepted based on
* their respective lists.
*
* Returns TRUE if keyword accepted, FALSE otherwise.
*
*/

BOOLEAN _db_keyword_ (keyword)
char *keyword;
{
REGISTER BOOLEAN accept;

if (!init_done) {
_db_push_ ("");
}
accept = FALSE;
if (DEBUGGING) {
if (stack -> level <= stack -> maxdepth) {
if (InList (stack -> functions, func)) {
if (InList (stack -> keywords, keyword)) {
if (InList (stack -> processes, _db_process_)) {
accept = TRUE;
}
}
}
}
}
return (accept);
}


/*
* FUNCTION
*
* Indent indent a line to the given indentation level
*
* SYNOPSIS
*
* LOCAL VOID Indent (indent)
* int indent;
*
* DESCRIPTION
*
* Indent a line to the given level. Note that this is
* a simple minded but portable implementation.
* There are better ways.
*
* Also, the indent must be scaled by the compile time option
* of character positions per nesting level.
*
*/

LOCAL VOID Indent (indent)
int indent;
{
REGISTER int count;
AUTO char buffer[PRINTBUF];

indent *= INDENT;
for (count = 0; (count < (indent - INDENT)) && (count < (PRINTBUF - 1)); count++) {
if ((count % INDENT) == 0) {
buffer[count] = '|';
} else {
buffer[count] = ' ';
}
}
buffer[count] = EOS;
(VOID) fprintf (_db_fp_, buffer);
(VOID) fflush (_db_fp_);
}


/*
* FUNCTION
*
* FreeList free all memory associated with a linked list
*
* SYNOPSIS
*
* LOCAL VOID FreeList (linkp)
* struct link *linkp;
*
* DESCRIPTION
*
* Given pointer to the head of a linked list, frees all
* memory held by the list and the members of the list.
*
*/

LOCAL VOID FreeList (linkp)
struct link *linkp;
{
REGISTER struct link *old;

while (linkp != NULL) {
old = linkp;
linkp = linkp -> next_link;
if (old -> string != NULL) {
free (old -> string);
}
free ((char *) old);
}
}


/*
* FUNCTION
*
* StrDup make a duplicate of a string in new memory
*
* SYNOPSIS
*
* LOCAL char *StrDup (string)
* char *string;
*
* DESCRIPTION
*
* Given pointer to a string, allocates sufficient memory to make
* a duplicate copy, and copies the string to the newly allocated
* memory. Failure to allocated sufficient memory is immediately
* fatal.
*
*/


LOCAL char *StrDup (string)
char *string;
{
REGISTER char *new;

new = DbugMalloc (strlen (string) + 1);
(VOID) strcpy (new, string);
return (new);
}


/*
* FUNCTION
*
* DoPrefix print debugger line prefix prior to indentation
*
* SYNOPSIS
*
* LOCAL VOID DoPrefix (_line_)
* int _line_;
*
* DESCRIPTION
*
* Print prefix common to all debugger output lines, prior to
* doing indentation if necessary. Print such information as
* current process name, current source file name and line number,
* and current function nesting depth.
*
*/


LOCAL VOID DoPrefix (_line_)
int _line_;
{
lineno++;
if (stack -> flags & NUMBER_ON) {
(VOID) fprintf (_db_fp_, "%5d: ", lineno);
}
if (stack -> flags & PROCESS_ON) {
(VOID) fprintf (_db_fp_, "%s: ", _db_process_);
}
if (stack -> flags & FILE_ON) {
(VOID) fprintf (_db_fp_, "%14s: ", file);
}
if (stack -> flags & LINE_ON) {
(VOID) fprintf (_db_fp_, "%5d: ", _line_);
}
if (stack -> flags & DEPTH_ON) {
(VOID) fprintf (_db_fp_, "%4d: ", stack -> level);
}
(VOID) fflush (_db_fp_);
}


/*
* FUNCTION
*
* OpenFile open new output stream for debugger output
*
* SYNOPSIS
*
* LOCAL VOID OpenFile (name)
* char *name;
*
* DESCRIPTION
*
* Given name of a new file (or "-" for stdout) opens the file
* and sets the output stream to the new file.
*
*/

LOCAL VOID OpenFile (name)
char *name;
{
REGISTER FILE *fp;
REGISTER BOOLEAN newfile;

if (name != NULL) {
if (strcmp (name, "-") == 0) {
_db_fp_ = stdout;
stack -> out_file = _db_fp_;
} else {
if (!Writable (name)) {
(VOID) fprintf (_db_fp_, ERR_OPEN, _db_process_, name);
perror ("");
(VOID) fflush (_db_fp_);
(VOID) XDelay (stack -> delay);
} else {
if (EXISTS (name)) {
newfile = FALSE;
} else {
newfile = TRUE;
}
fp = fopen (name, "a");
if (fp == NULL) {
(VOID) fprintf (_db_fp_, ERR_OPEN, _db_process_, name);
perror ("");
(VOID) fflush (_db_fp_);
(VOID) XDelay (stack -> delay);
} else {
_db_fp_ = fp;
stack -> out_file = fp;
if (newfile) {
ChangeOwner (name);
}
}
}
}
}
}


/*
* FUNCTION
*
* OpenProfile open new output stream for profiler output
*
* SYNOPSIS
*
* LOCAL VOID OpenProfile (name)
* char *name;
*
* DESCRIPTION
*
* Given name of a new file, opens the file
* and sets the profiler output stream to the new file.
*
* It is currently unclear whether the prefered behavior is
* to truncate any existing file, or simply append to it.
* The latter behavior would be desirable for collecting
* accumulated runtime history over a number of separate
* runs. It might take some changes to the analyzer program
* though, and the notes that Binayak sent with the profiling
* diffs indicated that append was the normal mode, but this
* does not appear to agree with the actual code. I haven't
* investigated at this time [fnf; 24-Jul-87].
*/

LOCAL VOID OpenProfile (name)
char *name;
{
REGISTER FILE *fp;
REGISTER BOOLEAN newfile;

if (name != NULL) {
if (!Writable (name)) {
(VOID) fprintf (_db_fp_, ERR_OPEN, _db_process_, name);
perror ("");
(VOID) fflush (_db_fp_);
(VOID) XDelay (stack -> delay);
} else {
if (EXISTS (name)) {
newfile = FALSE;
} else {
newfile = TRUE;
}
fp = fopen (name, "w");
if (fp == NULL) {
(VOID) fprintf (_db_fp_, ERR_OPEN, _db_process_, name);
perror ("");
(VOID) fflush (_db_fp_);
(VOID) XDelay (stack -> delay);
} else {
_db_pfp_ = fp;
stack -> prof_file = fp;
if (newfile) {
ChangeOwner (name);
}
}
}
}
}


/*
* FUNCTION
*
* CloseFile close the debug output stream
*
* SYNOPSIS
*
* LOCAL VOID CloseFile (fp)
* FILE *fp;
*
* DESCRIPTION
*
* Closes the debug output stream unless it is standard output
* or standard error.
*
*/

LOCAL VOID CloseFile (fp)
FILE *fp;
{
if (fp != stderr && fp != stdout) {
if (fclose (fp) == EOF) {
(VOID) fprintf (stderr, ERR_CLOSE, _db_process_);
perror ("");
(VOID) fflush (stderr);
(VOID) XDelay (stack -> delay);
}
}
}


/*
* FUNCTION
*
* DbugExit print error message and exit
*
* SYNOPSIS
*
* LOCAL VOID DbugExit (why)
* char *why;
*
* DESCRIPTION
*
* Prints error message using current process name, the reason for
* aborting (typically out of memory), and exits with status 1.
* This should probably be changed to use a status code
* defined in the user's debugger include file.
*
*/

LOCAL VOID DbugExit (why)
char *why;
{
(VOID) fprintf (stderr, ERR_ABORT, _db_process_, why);
(VOID) fflush (stderr);
(VOID) XDelay (stack -> delay);
exit (1);
}


/*
* FUNCTION
*
* DbugMalloc allocate memory for debugger runtime support
*
* SYNOPSIS
*
* LOCAL char *DbugMalloc (size)
* int size;
*
* DESCRIPTION
*
* Allocate more memory for debugger runtime support functions.
* Failure to to allocate the requested number of bytes is
* immediately fatal to the current process. This may be
* rather unfriendly behavior. It might be better to simply
* print a warning message, freeze the current debugger state,
* and continue execution.
*
*/

LOCAL char *DbugMalloc (size)
int size;
{
register char *new;

new = malloc ( size );
if (new == NULL) {
DbugExit ("out of memory");
}
return (new);
}


/*
* This function may be eliminated when strtok is available
* in the runtime environment (missing from BSD4.1).
*/

LOCAL char *strtok (s1, s2)
char *s1, *s2;
{
static char *end = NULL;
REGISTER char *rtnval;

rtnval = NULL;
if (s2 != NULL) {
if (s1 != NULL) {
end = s1;
rtnval = strtok ((char *) NULL, s2);
} else if (end != NULL) {
if (*end != EOS) {
rtnval = end;
while (*end != *s2 && *end != EOS) {end++;}
if (*end != EOS) {
*end++ = EOS;
}
}
}
}
return (rtnval);
}


/*
* FUNCTION
*
* BaseName strip leading pathname components from name
*
* SYNOPSIS
*
* LOCAL char *BaseName (pathname)
* char *pathname;
*
* DESCRIPTION
*
* Given pointer to a complete pathname, locates the base file
* name at the end of the pathname and returns a pointer to
* it.
*
*/

LOCAL char *BaseName (pathname)
char *pathname;
{
register char *base;

base = strrchr (pathname, '/');
if (base++ == NULL) {
base = pathname;
}
return (base);
}


/*
* FUNCTION
*
* Writable test to see if a pathname is writable/creatable
*
* SYNOPSIS
*
* LOCAL BOOLEAN Writable (pathname)
* char *pathname;
*
* DESCRIPTION
*
* Because the debugger might be linked in with a program that
* runs with the set-uid-bit (suid) set, we have to be careful
* about opening a user named file for debug output. This consists
* of checking the file for write access with the real user id,
* or checking the directory where the file will be created.
*
* Returns TRUE if the user would normally be allowed write or
* create access to the named file. Returns FALSE otherwise.
*
*/

LOCAL BOOLEAN Writable (pathname)
char *pathname;
{
REGISTER BOOLEAN granted;
#ifdef unix
REGISTER char *lastslash;
#endif

#ifndef unix
granted = TRUE;
#else
granted = FALSE;
if (EXISTS (pathname)) {
if (WRITABLE (pathname)) {
granted = TRUE;
}
} else {
lastslash = strrchr (pathname, '/');
if (lastslash != NULL) {
*lastslash = EOS;
} else {
pathname = ".";
}
if (WRITABLE (pathname)) {
granted = TRUE;
}
if (lastslash != NULL) {
*lastslash = '/';
}
}
#endif
return (granted);
}


/*
* This function may be eliminated when strrchr is available
* in the runtime environment (missing from BSD4.1).
* Alternately, you can use rindex() on BSD systems.
*/

LOCAL char *strrchr (s, c)
char *s;
char c;
{
REGISTER char *scan;

for (scan = s; *scan != EOS; scan++) {;}
while (scan > s && *--scan != c) {;}
if (*scan != c) {
scan = NULL;
}
return (scan);
}


/*
* FUNCTION
*
* ChangeOwner change owner to real user for suid programs
*
* SYNOPSIS
*
* LOCAL VOID ChangeOwner (pathname)
*
* DESCRIPTION
*
* For unix systems, change the owner of the newly created debug
* file to the real owner. This is strictly for the benefit of
* programs that are running with the set-user-id bit set.
*
* Note that at this point, the fact that pathname represents
* a newly created file has already been established. If the
* program that the debugger is linked to is not running with
* the suid bit set, then this operation is redundant (but
* harmless).
*
*/

LOCAL VOID ChangeOwner (pathname)
char *pathname;
{
#ifdef unix
if (chown (pathname, getuid (), getgid ()) == -1) {
(VOID) fprintf (stderr, ERR_CHOWN, _db_process_, pathname);
perror ("");
(VOID) fflush (stderr);
(VOID) XDelay (stack -> delay);
}
#endif
}


/*
* FUNCTION
*
* _db_setjmp_ save debugger environment
*
* SYNOPSIS
*
* VOID _db_setjmp_ ()
*
* DESCRIPTION
*
* Invoked as part of the user's DBUG_SETJMP macro to save
* the debugger environment in parallel with saving the user's
* environment.
*
*/

VOID _db_setjmp_ ()
{
jmplevel = stack -> level;
jmpfunc = func;
jmpfile = file;
}


/*
* FUNCTION
*
* _db_longjmp_ restore previously saved debugger environment
*
* SYNOPSIS
*
* VOID _db_longjmp_ ()
*
* DESCRIPTION
*
* Invoked as part of the user's DBUG_LONGJMP macro to restore
* the debugger environment in parallel with restoring the user's
* previously saved environment.
*
*/

VOID _db_longjmp_ ()
{
stack -> level = jmplevel;
if (jmpfunc) {
func = jmpfunc;
}
if (jmpfile) {
file = jmpfile;
}
}


/*
* FUNCTION
*
* DelayArg convert D flag argument to appropriate value
*
* SYNOPSIS
*
* LOCAL int DelayArg (value)
* int value;
*
* DESCRIPTION
*
* Converts delay argument, given in tenths of a second, to the
* appropriate numerical argument used by the system to delay
* that that many tenths of a second. For example, on the
* AMIGA, there is a system call "Delay()" which takes an
* argument in ticks (50 per second). On unix, the sleep
* command takes seconds. Thus a value of "10", for one
* second of delay, gets converted to 50 on the amiga, and 1
* on unix. Other systems will need to use a timing loop.
*
*/

LOCAL int DelayArg (value)
int value;
{
int delayarg = 0;

#ifdef unix
delayarg = value / 10; /* Delay is in seconds for sleep () */
#endif
#ifdef AMIGA
delayarg = (HZ * value) / 10; /* Delay in ticks for XDelay () */
#endif
return (delayarg);
}


/*
* A dummy delay stub for systems that do not support delays.
* With a little work, this can be turned into a timing loop.
*/

#ifndef unix
#ifndef AMIGA
XDelay ()
{
}
#endif
#endif


/*
* FUNCTION
*
* perror perror simulation for systems that don't have it
*
* SYNOPSIS
*
* LOCAL VOID perror (s)
* char *s;
*
* DESCRIPTION
*
* Perror produces a message on the standard error stream which
* provides more information about the library or system error
* just encountered. The argument string s is printed, followed
* by a ':', a blank, and then a message and a newline.
*
* An undocumented feature of the unix perror is that if the string
* 's' is a null string (NOT a NULL pointer!), then the ':' and
* blank are not printed.
*
* This version just complains about an "unknown system error".
*
*/

#if !unix && !(AMIGA || LATTICE || __TURBOC__ )
LOCAL VOID perror (s)
#if __STDC__
const char *s;
#else
char *s;
#endif
{
if (s && *s != EOS) {
(VOID) fprintf (stderr, "%s: ", s);
}
(VOID) fprintf (stderr, "\n");
}
#endif /* !unix && !(AMIGA && LATTICE) */

/*
* Here we need the definitions of the clock routine. Add your
* own for whatever system that you have.
*/

#if unix

# include
# if BSD4_3 || sun

/*
* Definition of the Clock() routine for 4.3 BSD.
*/

#include
#include

/*
* Returns the user time in milliseconds used by this process so
* far.
*/

LOCAL unsigned long Clock ()
{
struct rusage ru;

(VOID) getrusage (RUSAGE_SELF, &ru);
return ((ru.ru_utime.tv_sec * 1000) + (ru.ru_utime.tv_usec / 1000));
}

#else

LOCAL unsigned long Clock ()
{
return (0);
}

# endif

#else

#if AMIGA

struct DateStamp { /* Yes, this is a hack, but doing it right */
long ds_Days; /* is incredibly ugly without splitting this */
long ds_Minute; /* off into a separate file */
long ds_Tick;
};

static int first_clock = TRUE;
static struct DateStamp begin;
static struct DateStamp elapsed;

LOCAL unsigned long Clock ()
{
register struct DateStamp *now;
register unsigned long millisec = 0;
extern VOID *AllocMem ();

now = (struct DateStamp *) AllocMem ((long) sizeof (struct DateStamp), 0L);
if (now != NULL) {
if (first_clock == TRUE) {
first_clock = FALSE;
(VOID) DateStamp (now);
begin = *now;
}
(VOID) DateStamp (now);
millisec = 24 * 3600 * (1000 / HZ) * (now -> ds_Days - begin.ds_Days);
millisec += 60 * (1000 / HZ) * (now -> ds_Minute - begin.ds_Minute);
millisec += (1000 / HZ) * (now -> ds_Tick - begin.ds_Tick);
(VOID) FreeMem (now, (long) sizeof (struct DateStamp));
}
return (millisec);
}

#else

LOCAL unsigned long Clock ()
{
return (0);
}

#endif /* AMIGA */

#endif /* unix */

#ifdef AMIGA
XDelay(x)
int x;
{
if (x) Delay(x); /* fix Delay bug in AmigaDOS */
}
#endif



  3 Responses to “Category : C Source Code
Archive   : DMAKE38B.ZIP
Filename : DBUG.C

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