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-rw-r--r--gprof/basic_blocks.c452
1 files changed, 452 insertions, 0 deletions
diff --git a/gprof/basic_blocks.c b/gprof/basic_blocks.c
new file mode 100644
index 0000000..7d69db6
--- /dev/null
+++ b/gprof/basic_blocks.c
@@ -0,0 +1,452 @@
+/*
+ * Basic-block level related code: reading/writing of basic-block info
+ * to/from gmon.out; computing and formatting of basic-block related
+ * statistics.
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include "basic_blocks.h"
+#include "core.h"
+#include "gmon_io.h"
+#include "gmon_out.h"
+#include "gprof.h"
+#include "libiberty.h"
+#include "source.h"
+#include "sym_ids.h"
+
+
+/*
+ * Default option values:
+ */
+bool bb_annotate_all_lines = FALSE;
+int bb_min_calls = 1;
+int bb_table_length = 10;
+
+/*
+ * Variables used to compute annotated source listing stats:
+ */
+static long num_executable_lines;
+static long num_lines_executed;
+
+
+/*
+ * Helper for sorting. Compares two basic-blocks and returns result
+ * such that sorting will be increasing according to filename, line
+ * number, and basic-block address (in that order).
+ */
+static int
+DEFUN(cmp_bb, (lp, rp), const void *lp AND const void *rp)
+{
+ int r;
+ const Sym *left = *(const Sym**)lp;
+ const Sym *right = *(const Sym**)rp;
+
+ if (left->file && right->file) {
+ r = strcmp(left->file->name, right->file->name);
+ if (r) {
+ return r;
+ } /* if */
+
+ if (left->line_num != right->line_num) {
+ return left->line_num - right->line_num;
+ } /* if */
+ } /* if */
+
+ if (left->addr < right->addr) {
+ return -1;
+ } else if (left->addr > right->addr) {
+ return 1;
+ } else {
+ return 0;
+ } /* if */
+} /* cmp_bb */
+
+
+/*
+ * Helper for sorting. Order basic blocks in decreasing number of
+ * calls, ties are broken in increasing order of line numbers.
+ */
+static int
+DEFUN(cmp_ncalls, (lp, rp), const void *lp AND const void *rp)
+{
+ const Sym *left = *(const Sym**)lp;
+ const Sym *right = *(const Sym**)rp;
+
+ if (!left) {
+ return 1;
+ } else if (!right) {
+ return -1;
+ } /* if */
+
+ if (right->ncalls != left->ncalls) {
+ return right->ncalls - left->ncalls;
+ } /* if */
+
+ return left->line_num - right->line_num;
+} /* cmp_ncalls */
+
+
+/*
+ * Skip over variable length string.
+ */
+static void
+DEFUN(fskip_string, (fp), FILE *fp)
+{
+ int ch;
+
+ while ((ch = fgetc(fp)) != EOF) {
+ if (ch == '\0') {
+ break;
+ } /* if */
+ } /* if */
+} /* fskip_string */
+
+
+/*
+ * Read a basic-block record from file IFP. FILENAME is the name
+ * of file IFP and is provided for formatting error-messages only.
+ */
+void
+DEFUN(bb_read_rec, (ifp, filename), FILE *ifp AND const char *filename)
+{
+ int nblocks, b;
+ bfd_vma addr;
+ long ncalls;
+ Sym *sym;
+
+ if (fread(&nblocks, sizeof(nblocks), 1, ifp) != 1) {
+ fprintf(stderr, "%s: %s: unexpected end of file\n", whoami, filename);
+ done(1);
+ } /* if */
+
+ nblocks = bfd_get_32(core_bfd, (bfd_byte*) &nblocks);
+ if (gmon_file_version == 0) {
+ fskip_string(ifp);
+ } /* if */
+
+ for (b = 0; b < nblocks; ++b) {
+ if (gmon_file_version == 0) {
+ int line_num;
+ /*
+ * Version 0 had lots of extra stuff that we don't
+ * care about anymore.
+ */
+ if ((fread(&ncalls, sizeof(ncalls), 1, ifp) != 1)
+ || (fread(&addr, sizeof(addr), 1, ifp) != 1)
+ || (fskip_string(ifp), FALSE)
+ || (fskip_string(ifp), FALSE)
+ || (fread(&line_num, sizeof(line_num), 1, ifp) != 1))
+ {
+ perror(filename);
+ done(1);
+ } /* if */
+ } else {
+ if (fread(&addr, sizeof(addr), 1, ifp) != 1
+ || fread(&ncalls, sizeof(ncalls), 1, ifp) != 1)
+ {
+ perror(filename);
+ done(1);
+ } /* if */
+ } /* if */
+
+ /*
+ * Basic-block execution counts are meaningful only if we're
+ * profiling at the line-by-line level:
+ */
+ if (line_granularity) {
+
+ /* convert from target to host endianness: */
+
+ addr = get_vma(core_bfd, (bfd_byte*) &addr);
+
+ sym = sym_lookup(&symtab, addr);
+ sym->is_bb_head = TRUE;
+ sym->ncalls += bfd_get_32(core_bfd, (bfd_byte*)&ncalls);
+
+ DBG(BBDEBUG, printf("[bb_read_rec] 0x%lx->0x%lx (%s) cnt=%d\n",
+ addr, sym->addr, sym->name, sym->ncalls));
+ } else {
+ static bool user_warned = FALSE;
+
+ if (!user_warned) {
+ user_warned = TRUE;
+ fprintf(stderr,
+"%s: warning: ignoring basic-block exec counts (use -l or --line)\n",
+ whoami);
+ } /* if */
+ } /* if */
+ } /* for */
+ return;
+} /* bb_read_rec */
+
+
+/*
+ * Write all basic-blocks with non-zero counts to file OFP. FILENAME
+ * is the name of OFP and is provided for producing error-messages
+ * only.
+ */
+void
+DEFUN(bb_write_blocks, (ofp, filename), FILE *ofp AND const char *filename)
+{
+ const unsigned char tag = GMON_TAG_BB_COUNT;
+ int nblocks = 0;
+ bfd_vma addr;
+ long ncalls;
+ Sym *sym;
+
+ /* count how many non-zero blocks with have: */
+
+ for (sym = symtab.base; sym < symtab.limit; ++sym) {
+ if (sym->ncalls > 0) {
+ ++nblocks;
+ } /* if */
+ } /* for */
+
+ /* write header: */
+ bfd_put_32(core_bfd, nblocks, (bfd_byte*) &nblocks);
+ if (fwrite(&tag, sizeof(tag), 1, ofp) != 1
+ || fwrite(&nblocks, sizeof(nblocks), 1, ofp) != 1)
+ {
+ perror(filename);
+ done(1);
+ } /* if */
+
+ /* write counts: */
+ for (sym = symtab.base; sym < symtab.limit; ++sym) {
+ if (sym->ncalls == 0) {
+ continue;
+ } /* if */
+
+ put_vma(core_bfd, sym->addr, (bfd_byte*) &addr);
+ bfd_put_32(core_bfd, sym->ncalls, (bfd_byte*) &ncalls);
+
+ if (fwrite(&addr, sizeof(addr), 1, ofp) != 1
+ || fwrite(&ncalls, sizeof(ncalls), 1, ofp) != 1)
+ {
+ perror(filename);
+ done(1);
+ } /* if */
+ } /* for */
+} /* bb_write_blocks */
+
+
+/*
+ * Output basic-block statistics in a format that is easily parseable.
+ * Current the format is:
+ *
+ * <filename>:<line-number>: (<function-name>:<bb-addr): <ncalls>
+ */
+void
+DEFUN_VOID(print_exec_counts)
+{
+ Sym **sorted_bbs, *sym;
+ int i, len;
+
+ if (first_output) {
+ first_output = FALSE;
+ } else {
+ printf("\f\n");
+ } /* if */
+
+ /* sort basic-blocks according to function name and line number: */
+
+ sorted_bbs = (Sym**)xmalloc(symtab.len * sizeof(sorted_bbs[0]));
+ len = 0;
+ for (sym = symtab.base; sym < symtab.limit; ++sym) {
+ /*
+ * Accept symbol if it's the start of a basic-block and it is
+ * called at least bb_min_calls times and if it's in the
+ * INCL_EXEC table or there is no INCL_EXEC table and it does
+ * not appear in the EXCL_EXEC table.
+ */
+ if (sym->is_bb_head && sym->ncalls >= bb_min_calls
+ && (sym_lookup(&syms[INCL_EXEC], sym->addr)
+ || (syms[INCL_EXEC].len == 0
+ && !sym_lookup(&syms[EXCL_EXEC], sym->addr))))
+ {
+ sorted_bbs[len++] = sym;
+ } /* if */
+ } /* for */
+ qsort(sorted_bbs, len, sizeof(sorted_bbs[0]), cmp_bb);
+
+ /* output basic-blocks: */
+
+ for (i = 0; i < len; ++i) {
+ sym = sorted_bbs[i];
+ printf("%s:%d: (%s:0x%lx) %d executions\n",
+ sym->file ? sym->file->name : "<unknown>", sym->line_num,
+ sym->name, sym->addr, sym->ncalls);
+ } /* for */
+ free(sorted_bbs);
+} /* print_exec_counts */
+
+
+/*
+ * Helper for bb_annotated_source: format annotation containing
+ * number of line executions.
+ */
+static void
+DEFUN(annotate_with_count, (buf, width, line_num, arg),
+ char *buf AND int width AND int line_num AND void *arg)
+{
+ Source_File *sf = arg;
+ Sym *b;
+ long cnt;
+ static long last_count;
+
+ if (line_num == 1) {
+ last_count = -1;
+ } /* if */
+
+ b = 0;
+ if (line_num <= sf->num_lines) {
+ b = sf->line[line_num - 1];
+ } /* if */
+ if (!b) {
+ cnt = -1;
+ } else {
+ ++num_executable_lines;
+ cnt = b->ncalls;
+ } /* if */
+ if (cnt > 0) {
+ ++num_lines_executed;
+ } /* if */
+ if (cnt < 0 && bb_annotate_all_lines) {
+ cnt = last_count;
+ } /* if */
+
+ if (cnt < 0) {
+ strcpy(buf, "\t\t");
+ } else if (cnt < bb_min_calls) {
+ strcpy(buf, " ##### -> ");
+ } else {
+ sprintf(buf, "%12ld -> ", cnt);
+ } /* if */
+ last_count = cnt;
+} /* annotate_with_count */
+
+
+/*
+ * Annotate the files named in SOURCE_FILES with basic-block statistics
+ * (execution counts). After each source files, a few statistics
+ * regarding that source file are printed.
+ */
+void
+DEFUN_VOID(print_annotated_source)
+{
+ Sym *sym, *line_stats, *new_line;
+ Source_File *sf;
+ int i, table_len;
+ FILE *ofp;
+
+ /*
+ * Find maximum line number for each source file that user is
+ * interested in:
+ */
+ for (sym = symtab.base; sym < symtab.limit; ++sym) {
+ /*
+ * Accept symbol if it's file is known, its line number is
+ * bigger than anything we have seen for that file so far and
+ * if it's in the INCL_ANNO table or there is no INCL_ANNO
+ * table and it does not appear in the EXCL_ANNO table.
+ */
+ if (sym->file && sym->line_num > sym->file->num_lines
+ && (sym_lookup(&syms[INCL_ANNO], sym->addr)
+ || (syms[INCL_ANNO].len == 0
+ && !sym_lookup(&syms[EXCL_ANNO], sym->addr))))
+ {
+ sym->file->num_lines = sym->line_num;
+ } /* if */
+ } /* for */
+
+ /* allocate line descriptors: */
+
+ for (sf = first_src_file; sf; sf = sf->next) {
+ if (sf->num_lines > 0) {
+ sf->line = (void*) xmalloc(sf->num_lines * sizeof(sf->line[0]));
+ memset(sf->line, 0, sf->num_lines * sizeof(sf->line[0]));
+ } /* if */
+ } /* for */
+
+ /* count executions per line: */
+
+ for (sym = symtab.base; sym < symtab.limit; ++sym) {
+ if (sym->is_bb_head && sym->file && sym->file->num_lines
+ && (sym_lookup(&syms[INCL_ANNO], sym->addr)
+ || (syms[INCL_ANNO].len == 0
+ && !sym_lookup(&syms[EXCL_ANNO], sym->addr))))
+ {
+ sym->file->ncalls += sym->ncalls;
+ line_stats = sym->file->line[sym->line_num - 1];
+ if (!line_stats) {
+ /* common case has at most one basic-block per source line: */
+ sym->file->line[sym->line_num - 1] = sym;
+ } else if (!line_stats->addr) {
+ /* sym is the 3rd .. nth basic block for this line: */
+ line_stats->ncalls += sym->ncalls;
+ } else {
+ /* sym is the second basic block for this line */
+ new_line = (Sym*) xmalloc(sizeof(*new_line));
+ *new_line = *line_stats;
+ new_line->addr = 0;
+ new_line->ncalls += sym->ncalls;
+ sym->file->line[sym->line_num - 1] = new_line;
+ } /* if */
+ } /* if */
+ } /* for */
+
+ /* plod over source files, annotating them: */
+
+ for (sf = first_src_file; sf; sf = sf->next) {
+ if (!sf->num_lines || (ignore_zeros && sf->ncalls == 0)) {
+ continue;
+ } /* if */
+
+ num_executable_lines = num_lines_executed = 0;
+ ofp = annotate_source(sf, 16, annotate_with_count, sf);
+ if (!ofp) {
+ continue;
+ } /* if */
+
+ if (bb_table_length > 0) {
+ fprintf(ofp, "\n\nTop %d Lines:\n\n Line Count\n\n",
+ bb_table_length);
+
+ /* abuse line arrays---it's not needed anymore: */
+ qsort(sf->line, sf->num_lines, sizeof(sf->line[0]), cmp_ncalls);
+ table_len = bb_table_length;
+ if (table_len > sf->num_lines) {
+ table_len = sf->num_lines;
+ } /* if */
+ for (i = 0; i < table_len; ++i) {
+ sym = sf->line[i];
+ if (!sym || sym->ncalls <= 0) {
+ break;
+ } /* if */
+ fprintf(ofp, "%9d %10d\n", sym->line_num, sym->ncalls);
+ } /* for */
+ } /* if */
+
+ free(sf->line);
+ sf->line = 0;
+
+ fprintf(ofp, "\nExecution Summary:\n\n");
+ fprintf(ofp, "%9ld Executable lines in this file\n",
+ num_executable_lines);
+ fprintf(ofp, "%9ld Lines executed\n", num_lines_executed);
+ fprintf(ofp, "%9.2f Percent of the file executed\n",
+ num_executable_lines
+ ? 100.0 * num_lines_executed / (double) num_executable_lines
+ : 100.0);
+ fprintf(ofp, "\n%9d Total number of line executions\n", sf->ncalls);
+ fprintf(ofp, "%9.2f Average executions per line\n",
+ num_executable_lines
+ ? sf->ncalls / (double) num_executable_lines
+ : 0.0);
+ if (ofp != stdout) {
+ fclose(ofp);
+ } /* if */
+ } /* for */
+} /* print_annotated_source */
+
+ /*** end of basic_block.c ***/