path: root/gprof/gmon_io.c

/*
 * Input and output from/to gmon.out files.
 */
#include "cg_arcs.h"
#include "basic_blocks.h"
#include "bfd.h"
#include "core.h"
#include "call_graph.h"
#include "gmon_io.h"
#include "gmon_out.h"
#include "gmon.h"	/* fetch header for old format */
#include "gprof.h"
#include "hertz.h"
#include "hist.h"
#include "libiberty.h"

int gmon_input = 0;
int gmon_file_version = 0;	/* 0 == old (non-versioned) file format */

/*
 * This probably ought to be in libbfd.
 */
bfd_vma
DEFUN(get_vma, (abfd, addr), bfd *abfd AND bfd_byte *addr)
{
    switch (sizeof(bfd_vma)) {
      case 4: return bfd_get_32(abfd, addr);
      case 8: return bfd_get_64(abfd, addr);
      default:
	fprintf(stderr, "%s: bfd_vma has unexpected size of %ld bytes\n",
		whoami, (long) sizeof(bfd_vma));
	done(1);
    } /* switch */
} /* get_vma */


/*
 * This probably ought to be in libbfd.
 */
void
DEFUN(put_vma, (abfd, val, addr), bfd *abfd AND bfd_vma val AND bfd_byte *addr)
{
    switch (sizeof(bfd_vma)) {
      case 4: bfd_put_32(abfd, val, addr); break;
      case 8: bfd_put_64(abfd, val, addr); break;
      default:
	fprintf(stderr, "%s: bfd_vma has unexpected size of %ld bytes\n",
		whoami, (long) sizeof(bfd_vma));
	done(1);
    } /* switch */
} /* put_vma */


void
DEFUN(gmon_out_read, (filename), const char *filename)
{
    FILE *ifp;
    struct gmon_hdr ghdr;
    unsigned char tag;
    int nhist = 0, narcs = 0, nbbs = 0;

    /* open gmon.out file: */

    if (strcmp(filename, "-") == 0) {
	ifp = stdin;
    } else {
	ifp = fopen(filename, FOPEN_RB);
	if (!ifp) {
	    perror(filename);
	    done(1);
	} /* if */
    } /* if */
    if (fread(&ghdr, sizeof(struct gmon_hdr), 1, ifp) != 1) {
	fprintf(stderr, "%s: file too short to be a gmon file\n",
		filename);
	done(1);
    } /* if */

    if ((file_format == FF_MAGIC) ||
	(file_format == FF_AUTO && !strncmp(&ghdr.cookie[0], GMON_MAGIC, 4)))
    {
	if (file_format == FF_MAGIC && strncmp(&ghdr.cookie[0], GMON_MAGIC, 4))
	{
	    fprintf(stderr, "%s: file `%s' has bad magic cookie\n",
		    whoami, filename);
	    done(1);
	} /* if */

	/* right magic, so it's probably really a new gmon.out file */

	gmon_file_version = bfd_get_32(core_bfd, (bfd_byte *) ghdr.version);
	if (gmon_file_version != GMON_VERSION && gmon_file_version != 0) {
	    fprintf(stderr,
		    "%s: file `%s' has unsupported version %d\n",
		    whoami, filename, gmon_file_version);
	    done(1);
	} /* if */

	/* read in all the records: */
	while (fread(&tag, sizeof(tag), 1, ifp) == 1) {
	    switch (tag) {
	      case GMON_TAG_TIME_HIST:
		++nhist;
		gmon_input |= INPUT_HISTOGRAM;
		hist_read_rec(ifp, filename);
		break;

	      case GMON_TAG_CG_ARC:
		++narcs;
		gmon_input |= INPUT_CALL_GRAPH;
		cg_read_rec(ifp, filename);
		break;

	      case GMON_TAG_BB_COUNT:
		++nbbs;
		gmon_input |= INPUT_BB_COUNTS;
		bb_read_rec(ifp, filename);
		break;

	      default:
		fprintf(stderr,
			"%s: %s: found bad tag %d (file corrupted?)\n",
			whoami, filename, tag);
		done(1);
	    } /* switch */
	} /* while */
    } else if (file_format == FF_AUTO || file_format == FF_BSD) {
	struct hdr {
	    bfd_vma low_pc;
	    bfd_vma high_pc;
	    int	ncnt;
	};
	int i, samp_bytes, count;
	bfd_vma from_pc, self_pc;
	struct raw_arc raw_arc;
	struct raw_phdr raw;
	static struct hdr h;
	UNIT raw_bin_count;
	struct hdr tmp;

	/*
	 * Information from a gmon.out file is in two parts: an array of
	 * sampling hits within pc ranges, and the arcs.
	 */
	gmon_input = INPUT_HISTOGRAM | INPUT_CALL_GRAPH;

	/*
	 * This fseek() ought to work even on stdin as long as it's
	 * not an interactive device (heck, is there anybody who would
	 * want to type in a gmon.out at the terminal?).
	 */
	if (fseek(ifp, 0, SEEK_SET) < 0) {
	    perror(filename);
	    done(1);
	} /* if */
	if (fread(&raw, 1, sizeof(struct raw_phdr), ifp)
	    != sizeof(struct raw_phdr))
	{
	    fprintf(stderr, "%s: file too short to be a gmon file\n",
		    filename);
	    done(1);
	} /* if */
	tmp.low_pc  = get_vma(core_bfd, (bfd_byte *) &raw.low_pc[0]);
	tmp.high_pc = get_vma(core_bfd, (bfd_byte *) &raw.high_pc[0]);
	tmp.ncnt    = bfd_get_32(core_bfd, (bfd_byte *) &raw.ncnt[0]);
	if (s_highpc && (tmp.low_pc  != h.low_pc ||
			 tmp.high_pc != h.high_pc || tmp.ncnt != h.ncnt))
	{
	    fprintf(stderr, "%s: incompatible with first gmon file\n",
		    filename);
	    done(1);
	} /* if */
	h = tmp;
	s_lowpc = (bfd_vma) h.low_pc;
	s_highpc = (bfd_vma) h.high_pc;
	lowpc = (bfd_vma) h.low_pc / sizeof(UNIT);
	highpc = (bfd_vma) h.high_pc / sizeof(UNIT);
	samp_bytes = h.ncnt - sizeof(struct raw_phdr);
	hist_num_bins = samp_bytes / sizeof (UNIT);
	DBG(SAMPLEDEBUG,
	    printf("[gmon_out_read] lowpc 0x%lx highpc 0x%lx ncnt %d\n",
		   h.low_pc, h.high_pc, h.ncnt);
	    printf("[gmon_out_read]   s_lowpc 0x%lx   s_highpc 0x%lx\n",
		   s_lowpc, s_highpc);
	    printf("[gmon_out_read]     lowpc 0x%lx     highpc 0x%lx\n",
		   lowpc, highpc);
	    printf("[gmon_out_read] samp_bytes %d hist_num_bins %d\n",
		   samp_bytes, hist_num_bins));

	if (hist_num_bins) {
	    ++nhist;
	} /* if */

	if (!hist_sample) {
	    hist_sample =
	      (int*) xmalloc(hist_num_bins * sizeof(hist_sample[0]));
	    memset(hist_sample, 0, hist_num_bins * sizeof(hist_sample[0]));
	} /* if */

	for (i = 0; i < hist_num_bins; ++i) {
	    if (fread(raw_bin_count, sizeof(raw_bin_count), 1, ifp) != 1) {
		fprintf(stderr,
			"%s: unexpected EOF after reading %d/%d bins\n",
			whoami, --i, hist_num_bins);
		done(1);
	    } /* if */
	    hist_sample[i] += bfd_get_16(core_bfd, (bfd_byte*) raw_bin_count);
	} /* for */

	/*
	 * The rest of the file consists of a bunch of <from,self,count>
	 * tuples:
	 */
	while (fread(&raw_arc, sizeof(raw_arc), 1, ifp) == 1) {
	    ++narcs;
	    from_pc = get_vma(core_bfd, (bfd_byte *) raw_arc.from_pc);
	    self_pc = get_vma(core_bfd, (bfd_byte *) raw_arc.self_pc);
	    count = bfd_get_32(core_bfd, (bfd_byte *) raw_arc.count);
	    DBG(SAMPLEDEBUG,
		printf("[gmon_out_read] frompc 0x%lx selfpc 0x%lx count %d\n",
		       from_pc, self_pc, count));
	    /* add this arc: */
	    cg_tally(from_pc, self_pc, count);
	} /* while */
	fclose(ifp);

	if (hz == HZ_WRONG) {
	    /*
	     * How many ticks per second?  If we can't tell, report
	     * time in ticks.
	     */
	    hz = hertz();
	    if (hz == HZ_WRONG) {
		hz = 1;
		fprintf(stderr, "time is in ticks, not seconds\n");
	    } /* if */
	} /* if */
    } else {
	fprintf(stderr, "%s: don't know how to deal with file format %d\n",
		whoami, file_format);
	done(1);
    } /* if */

    if (output_style & STYLE_GMON_INFO) {
	printf("File `%s' (version %d) contains:\n",
	       filename, gmon_file_version);
	printf("\t%d histogram record%s\n",
	       nhist, nhist == 1 ? "" : "s");
	printf("\t%d call-graph record%s\n",
	       narcs, narcs == 1 ? "" : "s");
	printf("\t%d basic-block count record%s\n",
	       nbbs, nbbs == 1 ? "" : "s");
	first_output = FALSE;
    } /* if */
} /* gmon_out_read */


void
DEFUN(gmon_out_write, (filename), const char *filename)
{
    FILE *ofp;
    struct gmon_hdr ghdr;

    ofp = fopen(filename, FOPEN_WB);
    if (!ofp) {
	perror(filename);
	done(1);
    } /* if */

    if (file_format == FF_AUTO || file_format == FF_MAGIC) {
	/* write gmon header: */

	memcpy(&ghdr.cookie[0], GMON_MAGIC, 4);
	bfd_put_32(core_bfd, GMON_VERSION, (bfd_byte*) ghdr.version);
	if (fwrite(&ghdr, sizeof(ghdr), 1, ofp) != 1) {
	    perror(filename);
	    done(1);
	} /* if */

	/* write execution time histogram if we have one: */
	if (gmon_input & INPUT_HISTOGRAM) {
	    hist_write_hist(ofp, filename);
	} /* if */

	/* write call graph arcs if we have any: */
	if (gmon_input & INPUT_CALL_GRAPH) {
	    cg_write_arcs(ofp, filename);
	} /* if */

	/* write basic-block info if we have it: */
	if (gmon_input & INPUT_BB_COUNTS) {
	    bb_write_blocks(ofp, filename);
	} /* if */
    } else if (file_format == FF_BSD) {
	struct raw_arc raw_arc;
	UNIT raw_bin_count;
	bfd_vma lpc, hpc;
	int i, ncnt;
	Arc *arc;
	Sym *sym;

	put_vma(core_bfd, s_lowpc, (bfd_byte*) &lpc);
	put_vma(core_bfd, s_highpc, (bfd_byte*) &hpc);
	bfd_put_32(core_bfd,
		   hist_num_bins * sizeof(UNIT) + sizeof(struct raw_phdr),
		   (bfd_byte*) &ncnt);

	/* write header: */
	if (fwrite(&lpc, sizeof(lpc), 1, ofp) != 1
	    || fwrite(&hpc, sizeof(hpc), 1, ofp) != 1
	    || fwrite(&ncnt, sizeof(ncnt), 1, ofp) != 1)
	{
	    perror(filename);
	    done(1);
	} /* if */

	/* dump the samples: */

	for (i = 0; i < hist_num_bins; ++i) {
	    bfd_put_16(core_bfd, hist_sample[i], (bfd_byte*)&raw_bin_count[0]);
	    if (fwrite(&raw_bin_count[0], sizeof(raw_bin_count), 1, ofp) != 1)
	    {
		perror(filename);
		done(1);
	    } /* if */
	} /* for */

	/* dump the normalized raw arc information: */

	for (sym = symtab.base; sym < symtab.limit; ++sym) {
	    for (arc = sym->cg.children; arc; arc = arc->next_child) {
		put_vma(core_bfd, arc->parent->addr,
			(bfd_byte*) raw_arc.from_pc);
		put_vma(core_bfd, arc->child->addr,
			(bfd_byte*) raw_arc.self_pc);
		bfd_put_32(core_bfd, arc->count, (bfd_byte*) raw_arc.count);
		if (fwrite(&raw_arc, sizeof(raw_arc), 1, ofp) != 1) {
		    perror(filename);
		    done(1);
		} /* if */
		DBG(SAMPLEDEBUG,
		    printf("[dumpsum] frompc 0x%lx selfpc 0x%lx count %d\n",
			   arc->parent->addr, arc->child->addr, arc->count));
	    } /* for */
	} /* for */
	fclose(ofp);
    } else {
	fprintf(stderr, "%s: don't know how to deal with file format %d\n",
		whoami, file_format);
	done(1);
    } /* if */
} /* gmon_out_write */

			/*** gmon_out.c ***/