gecko-dev/cmd/xfe/gmon.c

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20 KiB
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1998-03-28 02:44:41 +00:00
/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* Mangled into a form that works on Sparc Solaris 2 by Mark Eichin
* for Cygnus Support, July 1992.
*/
/*
* Largely hacked, ANSI-afied and re-written for use at Netscape
* by djw@netscape.com.
* Algorithms and code are based on BSD gmon.c, rev 5.3.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <mon.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <signal.h>
#if 0
#include "sparc/gmon.h"
#else
struct phdr {
char *lpc;
char *hpc;
int ncnt;
};
#define HISTFRACTION 2
#define HISTCOUNTER unsigned short
#define HASHFRACTION 1
#define ARCDENSITY 2
#define MINARCS 50
struct tostruct {
char *selfpc;
long count;
unsigned short link;
};
struct rawarc {
unsigned long raw_frompc;
unsigned long raw_selfpc;
long raw_count;
};
#define ROUNDDOWN(x,y) (((x)/(y))*(y))
#define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y))
#endif
/* extern mcount() asm ("mcount"); */
/*extern*/ char *minbrk /* asm ("minbrk") */;
/*
* froms is actually a bunch of unsigned shorts indexing tos
*/
static int profiling = 3;
static unsigned short* froms;
static struct tostruct* tos = 0;
static long tolimit = 0;
static char* s_lowpc = 0;
static char* s_highpc = 0;
static unsigned long s_textsize = 0;
static int ssiz;
static char* sbuf;
static int s_scale;
/* see profil(2) where this is describe (incorrectly) */
#define SCALE_1_TO_1 0x10000L
#define MSG "No space for profiling buffer(s)\n"
static void moncontrol();
static void
monstartup(char* lowpc, char* highpc)
{
int monsize;
char *buffer;
register int o;
/*
* round lowpc and highpc to multiples of the density we're using
* so the rest of the scaling (here and in gprof) stays in ints.
*/
lowpc = (char *)
ROUNDDOWN((unsigned)lowpc, HISTFRACTION*sizeof(HISTCOUNTER));
s_lowpc = lowpc;
highpc = (char *)
ROUNDUP((unsigned)highpc, HISTFRACTION*sizeof(HISTCOUNTER));
s_highpc = highpc;
s_textsize = highpc - lowpc;
monsize = (s_textsize / HISTFRACTION) + sizeof(struct phdr);
buffer = sbrk( monsize );
if ( buffer == (char *) -1 ) {
write( 2 , MSG , sizeof(MSG) );
return;
}
froms = (unsigned short *) sbrk( s_textsize / HASHFRACTION );
if ( froms == (unsigned short *) -1 ) {
write( 2 , MSG , sizeof(MSG) );
froms = 0;
return;
}
tolimit = s_textsize * ARCDENSITY / 100;
if ( tolimit < MINARCS ) {
tolimit = MINARCS;
} else if ( tolimit > 65534 ) {
tolimit = 65534;
}
tos = (struct tostruct *) sbrk( tolimit * sizeof( struct tostruct ) );
if ( tos == (struct tostruct *) -1 ) {
write( 2 , MSG , sizeof(MSG) );
froms = 0;
tos = 0;
return;
}
minbrk = sbrk(0);
tos[0].link = 0;
sbuf = buffer;
ssiz = monsize;
( (struct phdr *) buffer ) -> lpc = lowpc;
( (struct phdr *) buffer ) -> hpc = highpc;
( (struct phdr *) buffer ) -> ncnt = ssiz;
monsize -= sizeof(struct phdr);
if ( monsize <= 0 )
return;
o = highpc - lowpc;
if( monsize < o )
#ifndef hp300
s_scale = ( (float) monsize / o ) * SCALE_1_TO_1;
#else /* avoid floating point */
{
int quot = o / monsize;
if (quot >= 0x10000)
s_scale = 1;
else if (quot >= 0x100)
s_scale = 0x10000 / quot;
else if (o >= 0x800000)
s_scale = 0x1000000 / (o / (monsize >> 8));
else
s_scale = 0x1000000 / ((o << 8) / monsize);
}
#endif
else
s_scale = SCALE_1_TO_1;
#if 0
moncontrol(1);
#endif
}
static void
_mcleanup(char* filename)
{
int fd;
int fromindex;
int endfrom;
char *frompc;
int toindex;
struct rawarc rawarc;
moncontrol(0);
fd = creat( filename , 0666 );
if ( fd < 0 ) {
perror( "mcount: gmon.out" );
return;
}
# ifdef DEBUG
fprintf( stderr , "[mcleanup] sbuf 0x%x ssiz %d\n" , sbuf , ssiz );
# endif DEBUG
write( fd , sbuf , ssiz );
endfrom = s_textsize / (HASHFRACTION * sizeof(*froms));
for ( fromindex = 0 ; fromindex < endfrom ; fromindex++ ) {
if ( froms[fromindex] == 0 ) {
continue;
}
frompc = s_lowpc + (fromindex * HASHFRACTION * sizeof(*froms));
for (toindex=froms[fromindex]; toindex!=0; toindex=tos[toindex].link) {
# ifdef DEBUG
fprintf( stderr ,
"[mcleanup] frompc 0x%x selfpc 0x%x count %d\n" ,
frompc , tos[toindex].selfpc , tos[toindex].count );
# endif DEBUG
rawarc.raw_frompc = (unsigned long) frompc;
rawarc.raw_selfpc = (unsigned long) tos[toindex].selfpc;
rawarc.raw_count = tos[toindex].count;
write( fd , &rawarc , sizeof rawarc );
}
}
close( fd );
}
/*
* The Sparc stack frame is only held together by the frame pointers
* in the register windows. According to the SVR4 SPARC ABI
* Supplement, Low Level System Information/Operating System
* Interface/Software Trap Types, a type 3 trap will flush all of the
* register windows to the stack, which will make it possible to walk
* the frames and find the return addresses.
* However, it seems awfully expensive to incur a trap (system
* call) for every function call. It turns out that "call" simply puts
* the return address in %o7 expecting the "save" in the procedure to
* shift it into %i7; this means that before the "save" occurs, %o7
* contains the address of the call to mcount, and %i7 still contains
* the caller above that. The asm mcount here simply saves those
* registers in argument registers and branches to internal_mcount,
* simulating a call with arguments.
* Kludges:
* 1) the branch to internal_mcount is hard coded; it should be
* possible to tell asm to use the assembler-name of a symbol.
* 2) in theory, the function calling mcount could have saved %i7
* somewhere and reused the register; in practice, I *think* this will
* break longjmp (and maybe the debugger) but I'm not certain. (I take
* some comfort in the knowledge that it will break the native mcount
* as well.)
* 3) if builtin_return_address worked, this could be portable.
* However, it would really have to be optimized for arguments of 0
* and 1 and do something like what we have here in order to avoid the
* trap per function call performance hit.
* 4) the atexit and monsetup calls prevent this from simply
* being a leaf routine that doesn't do a "save" (and would thus have
* access to %o7 and %i7 directly) but the call to write() at the end
* would have also prevented this.
*
* -- [eichin:19920702.1107EST]
*/
/* i7 == last ret, -> frompcindex */
/* o7 == current ret, -> selfpc */
asm(".global mcount; mcount: mov %i7,%o1; mov %o7,%o0;b,a internal_mcount");
static void
internal_mcount(register char* selfpc, register unsigned short* frompcindex)
{
register struct tostruct *top;
register struct tostruct *prevtop;
register long toindex;
/*
* check that we are profiling
* and that we aren't recursively invoked.
*/
if (profiling) {
goto out;
}
profiling++;
/*
* check that frompcindex is a reasonable pc value.
* for example: signal catchers get called from the stack,
* not from text space. too bad.
*/
frompcindex = (unsigned short *)((long)frompcindex - (long)s_lowpc);
if ((unsigned long)frompcindex > s_textsize) {
goto done;
}
frompcindex =
&froms[((long)frompcindex) / (HASHFRACTION * sizeof(*froms))];
toindex = *frompcindex;
if (toindex == 0) {
/*
* first time traversing this arc
*/
toindex = ++tos[0].link;
if (toindex >= tolimit) {
goto overflow;
}
*frompcindex = toindex;
top = &tos[toindex];
top->selfpc = selfpc;
top->count = 1;
top->link = 0;
goto done;
}
top = &tos[toindex];
if (top->selfpc == selfpc) {
/*
* arc at front of chain; usual case.
*/
top->count++;
goto done;
}
/*
* have to go looking down chain for it.
* top points to what we are looking at,
* prevtop points to previous top.
* we know it is not at the head of the chain.
*/
for (; /* goto done */; ) {
if (top->link == 0) {
/*
* top is end of the chain and none of the chain
* had top->selfpc == selfpc.
* so we allocate a new tostruct
* and link it to the head of the chain.
*/
toindex = ++tos[0].link;
if (toindex >= tolimit) {
goto overflow;
}
top = &tos[toindex];
top->selfpc = selfpc;
top->count = 1;
top->link = *frompcindex;
*frompcindex = toindex;
goto done;
}
/*
* otherwise, check the next arc on the chain.
*/
prevtop = top;
top = &tos[top->link];
if (top->selfpc == selfpc) {
/*
* there it is.
* increment its count
* move it to the head of the chain.
*/
top->count++;
toindex = prevtop->link;
prevtop->link = top->link;
top->link = *frompcindex;
*frompcindex = toindex;
goto done;
}
}
done:
profiling--;
/* and fall through */
out:
return; /* normal return restores saved registers */
overflow:
profiling++; /* halt further profiling */
# define TOLIMIT "mcount: tos overflow\n"
write(2, TOLIMIT, sizeof(TOLIMIT));
goto out;
}
/*
* Control profiling
* profiling is what mcount checks to see if
* all the data structures are ready.
*/
static void
moncontrol(int mode)
{
if (mode) {
/* start */
profil((unsigned short *)(sbuf + sizeof(struct phdr)),
ssiz - sizeof(struct phdr),
(int)s_lowpc, s_scale);
profiling = 0;
} else {
/* stop */
profil((unsigned short *)0, 0, 0, 0);
profiling = 3;
}
}
/*
* Mozilla-isms:
*/
/*
* Deal with nspr system traps.
*/
extern int _pr_intsOff; /* in nspr */
#define CONTROL_VARIABLE "MOZILLA_GPROF"
#define DEFAULT_NCALLS 10000
#define DEFAULT_RUNNING (1)
#define DEFAULT_DATAFILE "gmon.out"
#define BARSIZE 8 /* same as ld.so does */
typedef int (*funcptr_t)();
extern _etext;
#define PROG_LOW ((funcptr_t)0)
#define PROG_HIGH ((funcptr_t)&_etext)
static unsigned gmon_running;
#if 0
static WORD* gmon_buf;
static size_t gmon_nelems;
#endif
static size_t gmon_ncalls;
static char* gmon_filename;
static void
gmon_parse_env(char* s, size_t* ncalls_r, unsigned* running_r, char** file)
{
char* p = (char*)&internal_mcount; /* just so it gets used somewhere */
char* name;
char* value;
char buf[1024]; /* big enough to hold a long filename */
if (s == NULL)
return; /* no change */
strcpy(buf, s);
for (p = buf; *p != '\0';) {
while (*p != '\0' && isspace(*p)) /* skip white */
;
if (*p == '\0')
break;
name = p;
if ((p = strchr(name, '=')) == NULL)
break;
*p++ = '\0';
value = p;
if ((p = strchr(name, ';')) != NULL) {
*p++ = '\0';
} else {
for (p = name; *p != '\0'; p++)
;
}
if (strncmp(name, "NCALLS", 6) == 0) {
unsigned foo = atoi(value);
*ncalls_r = foo;
} else if (strncmp(name, "RUNNING", 7) == 0) {
if (strcmp(name, "true") == 0)
*running_r = 1;
else
*running_r = 0;
} else if (strncmp(name, "FILE", 4) == 0) {
*file = strdup(value);
}
}
}
static void
gmon_change_state(unsigned running)
{
int s;
/*
* At the moment, dump_to() doesn't work. Just always dump to
* gmon.out.
*/
s = _pr_intsOff; /* stop annoying assert from nspr */
_pr_intsOff = 0;
moncontrol(running);
_pr_intsOff = s;
gmon_running = running;
}
void gmon_dump();
static void
gmon_onexit_cb()
{
if (gmon_running)
gmon_dump();
}
void
gmon_init()
{
char* p = getenv(CONTROL_VARIABLE);
gmon_ncalls = DEFAULT_NCALLS;
gmon_filename = DEFAULT_DATAFILE;
gmon_running = DEFAULT_RUNNING;
if (p != NULL)
gmon_parse_env(p, &gmon_ncalls, &gmon_running, &gmon_filename);
#if 0
size_t bufsize;
bufsize =
sizeof(struct hdr) +
(gmon_ncalls * sizeof(struct cnt)) +
(((PROG_HIGH - PROG_LOW)/BARSIZE) * sizeof(WORD)) +
sizeof(WORD) - 1;
gmon_nelems = (bufsize / sizeof(WORD));
gmon_buf = (WORD*)malloc(bufsize);
if (!gmon_buf) {
fprintf(stderr,
"gmon_init() failed to allocate data buffers.\n"
"Sorry, I just cannot continue like this. How about\n"
"checking " CONTROL_VARIABLE ", currently set to:\n"
CONTROL_VARIABLE "=" "%s\n", (p != NULL)? p: "unset");
exit(3);
}
#endif
atexit(gmon_onexit_cb);
monstartup((char*)PROG_LOW, (char*)PROG_HIGH);
gmon_change_state(gmon_running);
}
void
gmon_start()
{
gmon_change_state(1);
}
void
gmon_stop()
{
gmon_change_state(0);
}
void
gmon_dump_to(char* name)
{
int s;
/*
* At the moment, dump_to() doesn't work. Just always dump to
* gmon.out.
*/
s = _pr_intsOff; /* stop annoying assert from nspr */
_pr_intsOff = 0;
_mcleanup(name);
_pr_intsOff = s;
}
void
gmon_dump()
{
gmon_dump_to(gmon_filename);
}
static int
gprof_out_filter_section_1(FILE* ifp, FILE* ofp)
{
char buf[512];
char* p;
char* q;
char* rest;
unsigned link;
unsigned target;
while (fgets(buf, sizeof(buf), ifp) != NULL) {
if (buf[0] == '\f')
break; /* done for this section */
if ((p = strchr(buf, '[')) == NULL) { /* heading or data line */
fputs(buf, ofp); /* white space, etc */
continue;
}
target = 0;
rest = buf;
if (p == buf && (q = strchr(p+1, '[')) != NULL) { /* heading line */
target = strtol(p+1, &rest, 10);
if (*rest == ']')
rest++;
p = q;
}
link = atoi(p+1);
*p = '\0';
if (rest != buf) {
fprintf(ofp,
"<A NAME=s1i%d>[%d]</A>%s<A HREF=#s2i%d>[%d]</A>\n",
target, target, rest, link, link);
} else {
fprintf(ofp,
"%s<A HREF=#s2i%d>[%d]</A>\n",
rest, link, link);
}
}
return 0; /* ok */
}
static int
gprof_out_filter_section_2(FILE* ifp, FILE* ofp)
{
char buf[512];
char* p;
unsigned link;
while (fgets(buf, sizeof(buf), ifp) != NULL) {
if (buf[0] == '\f')
break; /* done for this section */
if ((p = strchr(buf, '[')) == NULL) { /* data line */
fputs(buf, ofp); /* white space, etc */
continue;
}
link = atoi(p+1);
*p = '\0';
fprintf(ofp,
"<A NAME=s2i%d></A>%s<A HREF=#s1i%d>[%d]</A>\n",
link, buf, link, link);
}
return 0; /* ok */
}
int
gprof_out_filter(FILE* ifp, FILE* ofp, unsigned do_reverse)
{
/* only needed if we want to reverse the output order */
FILE* tfp;
if (do_reverse) {
if ((tfp = tmpfile()) == NULL) {
fprintf(stderr, "gprof filter: could not create tmp file\n");
return -1;
}
} else {
tfp = ofp;
}
fprintf(ofp, "<HTML>\n<BODY>\n<PRE>\n");
if (gprof_out_filter_section_1(ifp, tfp) == -1)
return -1;
if (gprof_out_filter_section_2(ifp, ofp) == -1)
return -1;
if (tfp != ofp) {
int c;
rewind(tfp);
while ((c = getc(tfp)) != -1)
putc(c, ofp);
fclose(tfp);
}
fprintf(ofp, "</PRE>\n</BODY>\n</HTML>\n");
return 0;
}
extern const char *fe_progname_long; /* defined in xfe.h */
int
gmon_gprof_to(char* gmon_out, char* gprof_out, unsigned nfuncs)
{
char* argv[16];
int argc = 0;
int child_pid;
int status;
char buf[16];
FILE* fp = NULL;
int rv = 0;
int s;
struct sigaction newact;
struct sigaction oldact;
s = _pr_intsOff; /* stop annoying assert from nspr */
_pr_intsOff = 0;
if ((fp = fopen(gprof_out, "w+")) == NULL) {
fprintf(stderr, "gmon_gprof_to(): could not create %s: ", gprof_out);
perror(NULL);
rv = -1;
goto return_point;
}
/*
* gprof -b [-n topn] progname gmon_filename > tmpfile
*/
argv[argc++] = "gprof";
argv[argc++] = "-b";
argv[argc++] = "-E";
argv[argc++] = "mcount";
argv[argc++] = "-E";
argv[argc++] = "internal_mcount";
if (nfuncs != 0) {
sprintf(buf, "%d", nfuncs);
argv[argc++] = "-n";
argv[argc++] = buf;
}
argv[argc++] = (char*)fe_progname_long;
argv[argc++] = gmon_out;
argv[argc] = NULL;
/* Setup signals so that SIGCHLD is ignored as we want to do waitpid */
newact.sa_handler = SIG_DFL;
newact.sa_flags = 0;
sigfillset(&newact.sa_mask);
sigaction(SIGCHLD, &newact, &oldact);
if ((child_pid = fork()) == -1) {
fprintf(stderr, "gmon_dump_html_to(): could not fork()\n");
rv = -1;
goto return_point;
}
if (child_pid == 0) { /* I am the child */
int fd = fileno(fp);
/*
* Redirect standard out.
*/
close(1);
dup(fd);
close(fd);
/*
* Close all but standard in, out, error.
*/
for (fd--; fd > 2; fd--)
close(fd);
printf("doing exec now dude!\n");
if (execvp(argv[0], argv) == -1) {
fprintf(stderr, "could not exec %s: ", argv[0]);
perror(NULL);
exit(3);
}
/*NOTREACHED*/
}
/*
* wait
*/
if (waitpid(child_pid, &status, 0) == -1) {
fprintf(stderr, "wait on %s failed: ", argv[0]);
perror(NULL);
rv = -1;
}
return_point:
/* Reset SIGCHLD signal hander before returning */
sigaction(SIGCHLD, &oldact, NULL);
if (fp != NULL)
fclose(fp);
_pr_intsOff = s;
return rv;
}
static unsigned gmon_report_reverse = 1; /* flat then graph */
static unsigned gmon_report_size = 0;
unsigned
gmon_is_running()
{
return (gmon_running != 0); /* maybe should check profiling */
}
unsigned
gmon_report_get_reverse()
{
return gmon_report_reverse;
}
void
gmon_report_set_reverse(unsigned yep)
{
gmon_report_reverse = yep;
}
unsigned
gmon_report_get_size()
{
return gmon_report_size;
}
void
gmon_report_set_size(unsigned yep)
{
gmon_report_size = yep;
}
void
gmon_reset()
{
gmon_change_state(0); /* maybe we don't need to do this, but ahhh */
memset(sbuf, 0, ssiz);
memset(froms, 0, (s_textsize / HASHFRACTION));
memset(tos, 0, (tolimit * sizeof(struct tostruct)));
((struct phdr *)sbuf)->lpc = s_lowpc;
((struct phdr *)sbuf)->hpc = s_highpc;
((struct phdr *)sbuf)->ncnt = ssiz;
}
int
gmon_html_filter_to(char* gprofout, char* html, unsigned reverse)
{
FILE* ifp;
FILE* ofp;
int rv = 0;
if ((ifp = fopen(gprofout, "r")) == NULL) {
fprintf(stderr, "gmon_html_filter_to(): could not open %s", gprofout);
perror(NULL);
return -1;
}
if ((ofp = fopen(html, "w")) == NULL) {
fprintf(stderr, "gmon_html_filter_to(): could not create %s", html);
perror(NULL);
fclose(ifp);
return -1;
}
if (gprof_out_filter(ifp, ofp, reverse) == -1)
rv = -1;
fclose(ifp);
fclose(ofp);
return rv;
}