/* Utility functions for reading gcda files into in-memory gcov_info structures and offline profile processing. */ /* Copyright (C) 2014-2015 Free Software Foundation, Inc. Contributed by Rong Xu <xur@google.com>. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ #define IN_GCOV_TOOL 1 #include "libgcov.h" #include "intl.h" #include "diagnostic.h" #include "version.h" #include "demangle.h" /* Borrowed from basic-block.h. */ #define RDIV(X,Y) (((X) + (Y) / 2) / (Y)) extern gcov_position_t gcov_position(); extern int gcov_is_error(); /* Verbose mode for debug. */ static int verbose; /* Set verbose flag. */ void gcov_set_verbose (void) { verbose = 1; } /* The following part is to read Gcda and reconstruct GCOV_INFO. */ #include "obstack.h" #include <unistd.h> #ifdef HAVE_FTW_H #include <ftw.h> #endif static void tag_function (unsigned, unsigned); static void tag_blocks (unsigned, unsigned); static void tag_arcs (unsigned, unsigned); static void tag_lines (unsigned, unsigned); static void tag_counters (unsigned, unsigned); static void tag_summary (unsigned, unsigned); /* The gcov_info for the first module. */ static struct gcov_info *curr_gcov_info; /* The gcov_info being processed. */ static struct gcov_info *gcov_info_head; /* This variable contains all the functions in current module. */ static struct obstack fn_info; /* The function being processed. */ static struct gcov_fn_info *curr_fn_info; /* The number of functions seen so far. */ static unsigned num_fn_info; /* This variable contains all the counters for current module. */ static int k_ctrs_mask[GCOV_COUNTERS]; /* The kind of counters that have been seen. */ static struct gcov_ctr_info k_ctrs[GCOV_COUNTERS]; /* Number of kind of counters that have been seen. */ static int k_ctrs_types; /* Merge functions for counters. */ #define DEF_GCOV_COUNTER(COUNTER, NAME, FN_TYPE) __gcov_merge ## FN_TYPE, static gcov_merge_fn ctr_merge_functions[GCOV_COUNTERS] = { #include "gcov-counter.def" }; #undef DEF_GCOV_COUNTER /* Set the ctrs field in gcov_fn_info object FN_INFO. */ static void set_fn_ctrs (struct gcov_fn_info *fn_info) { int j = 0, i; for (i = 0; i < GCOV_COUNTERS; i++) { if (k_ctrs_mask[i] == 0) continue; fn_info->ctrs[j].num = k_ctrs[i].num; fn_info->ctrs[j].values = k_ctrs[i].values; j++; } if (k_ctrs_types == 0) k_ctrs_types = j; else gcc_assert (j == k_ctrs_types); } /* For each tag in gcda file, we have an entry here. TAG is the tag value; NAME is the tag name; and PROC is the handler function. */ typedef struct tag_format { unsigned tag; char const *name; void (*proc) (unsigned, unsigned); } tag_format_t; /* Handler table for various Tags. */ static const tag_format_t tag_table[] = { {0, "NOP", NULL}, {0, "UNKNOWN", NULL}, {0, "COUNTERS", tag_counters}, {GCOV_TAG_FUNCTION, "FUNCTION", tag_function}, {GCOV_TAG_BLOCKS, "BLOCKS", tag_blocks}, {GCOV_TAG_ARCS, "ARCS", tag_arcs}, {GCOV_TAG_LINES, "LINES", tag_lines}, {GCOV_TAG_OBJECT_SUMMARY, "OBJECT_SUMMARY", tag_summary}, {GCOV_TAG_PROGRAM_SUMMARY, "PROGRAM_SUMMARY", tag_summary}, {0, NULL, NULL} }; /* Handler for reading function tag. */ static void tag_function (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED) { int i; /* write out previous fn_info. */ if (num_fn_info) { set_fn_ctrs (curr_fn_info); obstack_ptr_grow (&fn_info, curr_fn_info); } /* Here we over allocate a bit, using GCOV_COUNTERS instead of the actual active counter types. */ curr_fn_info = (struct gcov_fn_info *) xcalloc (sizeof (struct gcov_fn_info) + GCOV_COUNTERS * sizeof (struct gcov_ctr_info), 1); for (i = 0; i < GCOV_COUNTERS; i++) k_ctrs[i].num = 0; k_ctrs_types = 0; curr_fn_info->key = curr_gcov_info; curr_fn_info->ident = gcov_read_unsigned (); curr_fn_info->lineno_checksum = gcov_read_unsigned (); curr_fn_info->cfg_checksum = gcov_read_unsigned (); num_fn_info++; if (verbose) fnotice (stdout, "tag one function id=%d\n", curr_fn_info->ident); } /* Handler for reading block tag. */ static void tag_blocks (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED) { /* TBD: gcov-tool currently does not handle gcno files. Assert here. */ gcc_unreachable (); } /* Handler for reading flow arc tag. */ static void tag_arcs (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED) { /* TBD: gcov-tool currently does not handle gcno files. Assert here. */ gcc_unreachable (); } /* Handler for reading line tag. */ static void tag_lines (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED) { /* TBD: gcov-tool currently does not handle gcno files. Assert here. */ gcc_unreachable (); } /* Handler for reading counters array tag with value as TAG and length of LENGTH. */ static void tag_counters (unsigned tag, unsigned length) { unsigned n_counts = GCOV_TAG_COUNTER_NUM (length); gcov_type *values; unsigned ix; unsigned tag_ix; tag_ix = GCOV_COUNTER_FOR_TAG (tag); gcc_assert (tag_ix < GCOV_COUNTERS); k_ctrs_mask [tag_ix] = 1; gcc_assert (k_ctrs[tag_ix].num == 0); k_ctrs[tag_ix].num = n_counts; k_ctrs[tag_ix].values = values = (gcov_type *) xmalloc (n_counts * sizeof (gcov_type)); gcc_assert (values); for (ix = 0; ix != n_counts; ix++) values[ix] = gcov_read_counter (); } /* Handler for reading summary tag. */ static void tag_summary (unsigned tag ATTRIBUTE_UNUSED, unsigned length ATTRIBUTE_UNUSED) { struct gcov_summary summary; gcov_read_summary (&summary); } /* This function is called at the end of reading a gcda file. It flushes the contents in curr_fn_info to gcov_info object OBJ_INFO. */ static void read_gcda_finalize (struct gcov_info *obj_info) { int i; set_fn_ctrs (curr_fn_info); obstack_ptr_grow (&fn_info, curr_fn_info); /* We set the following fields: merge, n_functions, and functions. */ obj_info->n_functions = num_fn_info; obj_info->functions = (const struct gcov_fn_info**) obstack_finish (&fn_info); /* wrap all the counter array. */ for (i=0; i< GCOV_COUNTERS; i++) { if (k_ctrs_mask[i]) obj_info->merge[i] = ctr_merge_functions[i]; } } /* Read the content of a gcda file FILENAME, and return a gcov_info data structure. Program level summary CURRENT_SUMMARY will also be updated. */ static struct gcov_info * read_gcda_file (const char *filename) { unsigned tags[4]; unsigned depth = 0; unsigned magic, version; struct gcov_info *obj_info; int i; for (i=0; i< GCOV_COUNTERS; i++) k_ctrs_mask[i] = 0; k_ctrs_types = 0; if (!gcov_open (filename)) { fnotice (stderr, "%s:cannot open\n", filename); return NULL; } /* Read magic. */ magic = gcov_read_unsigned (); if (magic != GCOV_DATA_MAGIC) { fnotice (stderr, "%s:not a gcov data file\n", filename); gcov_close (); return NULL; } /* Read version. */ version = gcov_read_unsigned (); if (version != GCOV_VERSION) { fnotice (stderr, "%s:incorrect gcov version %d vs %d \n", filename, version, GCOV_VERSION); gcov_close (); return NULL; } /* Instantiate a gcov_info object. */ curr_gcov_info = obj_info = (struct gcov_info *) xcalloc (sizeof (struct gcov_info) + sizeof (struct gcov_ctr_info) * GCOV_COUNTERS, 1); obj_info->version = version; obstack_init (&fn_info); num_fn_info = 0; curr_fn_info = 0; { size_t len = strlen (filename) + 1; char *str_dup = (char*) xmalloc (len); memcpy (str_dup, filename, len); obj_info->filename = str_dup; } /* Read stamp. */ obj_info->stamp = gcov_read_unsigned (); while (1) { gcov_position_t base; unsigned tag, length; tag_format_t const *format; unsigned tag_depth; int error; unsigned mask; tag = gcov_read_unsigned (); if (!tag) break; length = gcov_read_unsigned (); base = gcov_position (); mask = GCOV_TAG_MASK (tag) >> 1; for (tag_depth = 4; mask; mask >>= 8) { if (((mask & 0xff) != 0xff)) { warning (0, "%s:tag `%x' is invalid\n", filename, tag); break; } tag_depth--; } for (format = tag_table; format->name; format++) if (format->tag == tag) goto found; format = &tag_table[GCOV_TAG_IS_COUNTER (tag) ? 2 : 1]; found:; if (tag) { if (depth && depth < tag_depth) { if (!GCOV_TAG_IS_SUBTAG (tags[depth - 1], tag)) warning (0, "%s:tag `%x' is incorrectly nested\n", filename, tag); } depth = tag_depth; tags[depth - 1] = tag; } if (format->proc) { unsigned long actual_length; (*format->proc) (tag, length); actual_length = gcov_position () - base; if (actual_length > length) warning (0, "%s:record size mismatch %lu bytes overread\n", filename, actual_length - length); else if (length > actual_length) warning (0, "%s:record size mismatch %lu bytes unread\n", filename, length - actual_length); } gcov_sync (base, length); if ((error = gcov_is_error ())) { warning (0, error < 0 ? "%s:counter overflow at %lu\n" : "%s:read error at %lu\n", filename, (long unsigned) gcov_position ()); break; } } read_gcda_finalize (obj_info); gcov_close (); return obj_info; } #ifdef HAVE_FTW_H /* This will be called by ftw(). It opens and read a gcda file FILENAME. Return a non-zero value to stop the tree walk. */ static int ftw_read_file (const char *filename, const struct stat *status ATTRIBUTE_UNUSED, int type) { int filename_len; int suffix_len; struct gcov_info *obj_info; /* Only read regular files. */ if (type != FTW_F) return 0; filename_len = strlen (filename); suffix_len = strlen (GCOV_DATA_SUFFIX); if (filename_len <= suffix_len) return 0; if (strcmp(filename + filename_len - suffix_len, GCOV_DATA_SUFFIX)) return 0; if (verbose) fnotice (stderr, "reading file: %s\n", filename); obj_info = read_gcda_file (filename); if (!obj_info) return 0; obj_info->next = gcov_info_head; gcov_info_head = obj_info; return 0; } #endif /* Initializer for reading a profile dir. */ static inline void read_profile_dir_init (void) { gcov_info_head = 0; } /* Driver for read a profile directory and convert into gcov_info list in memory. Return NULL on error, Return the head of gcov_info list on success. */ struct gcov_info * gcov_read_profile_dir (const char* dir_name, int recompute_summary ATTRIBUTE_UNUSED) { char *pwd; int ret; read_profile_dir_init (); if (access (dir_name, R_OK) != 0) { fnotice (stderr, "cannot access directory %s\n", dir_name); return NULL; } pwd = getcwd (NULL, 0); gcc_assert (pwd); ret = chdir (dir_name); if (ret !=0) { fnotice (stderr, "%s is not a directory\n", dir_name); return NULL; } #ifdef HAVE_FTW_H ftw (".", ftw_read_file, 50); #endif ret = chdir (pwd); free (pwd); return gcov_info_head;; } /* This part of the code is to merge profile counters. These variables are set in merge_wrapper and to be used by global function gcov_read_counter_mem() and gcov_get_merge_weight. */ /* We save the counter value address to this variable. */ static gcov_type *gcov_value_buf; /* The number of counter values to be read by current merging. */ static gcov_unsigned_t gcov_value_buf_size; /* The index of counter values being read. */ static gcov_unsigned_t gcov_value_buf_pos; /* The weight of current merging. */ static unsigned gcov_merge_weight; /* Read a counter value from gcov_value_buf array. */ gcov_type gcov_read_counter_mem (void) { gcov_type ret; gcc_assert (gcov_value_buf_pos < gcov_value_buf_size); ret = *(gcov_value_buf + gcov_value_buf_pos); ++gcov_value_buf_pos; return ret; } /* Return the recorded merge weight. */ unsigned gcov_get_merge_weight (void) { return gcov_merge_weight; } /* A wrapper function for merge functions. It sets up the value buffer and weights and then calls the merge function. */ static void merge_wrapper (gcov_merge_fn f, gcov_type *v1, gcov_unsigned_t n, gcov_type *v2, unsigned w) { gcov_value_buf = v2; gcov_value_buf_pos = 0; gcov_value_buf_size = n; gcov_merge_weight = w; (*f) (v1, n); } /* Offline tool to manipulate profile data. This tool targets on matched profiles. But it has some tolerance on unmatched profiles. When merging p1 to p2 (p2 is the dst), * m.gcda in p1 but not in p2: append m.gcda to p2 with specified weight; emit warning * m.gcda in p2 but not in p1: keep m.gcda in p2 and multiply by specified weight; emit warning. * m.gcda in both p1 and p2: ** p1->m.gcda->f checksum matches p2->m.gcda->f: simple merge. ** p1->m.gcda->f checksum does not matches p2->m.gcda->f: keep p2->m.gcda->f and drop p1->m.gcda->f. A warning is emitted. */ /* Add INFO2's counter to INFO1, multiplying by weight W. */ static int gcov_merge (struct gcov_info *info1, struct gcov_info *info2, int w) { unsigned f_ix; unsigned n_functions = info1->n_functions; int has_mismatch = 0; gcc_assert (info2->n_functions == n_functions); for (f_ix = 0; f_ix < n_functions; f_ix++) { unsigned t_ix; const struct gcov_fn_info *gfi_ptr1 = info1->functions[f_ix]; const struct gcov_fn_info *gfi_ptr2 = info2->functions[f_ix]; const struct gcov_ctr_info *ci_ptr1, *ci_ptr2; if (!gfi_ptr1 || gfi_ptr1->key != info1) continue; if (!gfi_ptr2 || gfi_ptr2->key != info2) continue; if (gfi_ptr1->cfg_checksum != gfi_ptr2->cfg_checksum) { fnotice (stderr, "in %s, cfg_checksum mismatch, skipping\n", info1->filename); has_mismatch = 1; continue; } ci_ptr1 = gfi_ptr1->ctrs; ci_ptr2 = gfi_ptr2->ctrs; for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++) { gcov_merge_fn merge1 = info1->merge[t_ix]; gcov_merge_fn merge2 = info2->merge[t_ix]; gcc_assert (merge1 == merge2); if (!merge1) continue; gcc_assert (ci_ptr1->num == ci_ptr2->num); merge_wrapper (merge1, ci_ptr1->values, ci_ptr1->num, ci_ptr2->values, w); ci_ptr1++; ci_ptr2++; } } return has_mismatch; } /* Find and return the match gcov_info object for INFO from ARRAY. SIZE is the length of ARRAY. Return NULL if there is no match. */ static struct gcov_info * find_match_gcov_info (struct gcov_info **array, int size, struct gcov_info *info) { struct gcov_info *gi_ptr; struct gcov_info *ret = NULL; int i; for (i = 0; i < size; i++) { gi_ptr = array[i]; if (gi_ptr == 0) continue; if (!strcmp (gi_ptr->filename, info->filename)) { ret = gi_ptr; array[i] = 0; break; } } if (ret && ret->n_functions != info->n_functions) { fnotice (stderr, "mismatched profiles in %s (%d functions" " vs %d functions)\n", ret->filename, ret->n_functions, info->n_functions); ret = NULL; } return ret; } /* Merge the list of gcov_info objects from SRC_PROFILE to TGT_PROFILE. Return 0 on success: without mismatch. Reutrn 1 on error. */ int gcov_profile_merge (struct gcov_info *tgt_profile, struct gcov_info *src_profile, int w1, int w2) { struct gcov_info *gi_ptr; struct gcov_info **tgt_infos; struct gcov_info *tgt_tail; struct gcov_info **in_src_not_tgt; unsigned tgt_cnt = 0, src_cnt = 0; unsigned unmatch_info_cnt = 0; unsigned int i; for (gi_ptr = tgt_profile; gi_ptr; gi_ptr = gi_ptr->next) tgt_cnt++; for (gi_ptr = src_profile; gi_ptr; gi_ptr = gi_ptr->next) src_cnt++; tgt_infos = (struct gcov_info **) xmalloc (sizeof (struct gcov_info *) * tgt_cnt); gcc_assert (tgt_infos); in_src_not_tgt = (struct gcov_info **) xmalloc (sizeof (struct gcov_info *) * src_cnt); gcc_assert (in_src_not_tgt); for (gi_ptr = tgt_profile, i = 0; gi_ptr; gi_ptr = gi_ptr->next, i++) tgt_infos[i] = gi_ptr; tgt_tail = tgt_infos[tgt_cnt - 1]; /* First pass on tgt_profile, we multiply w1 to all counters. */ if (w1 > 1) { for (i = 0; i < tgt_cnt; i++) gcov_merge (tgt_infos[i], tgt_infos[i], w1-1); } /* Second pass, add src_profile to the tgt_profile. */ for (gi_ptr = src_profile; gi_ptr; gi_ptr = gi_ptr->next) { struct gcov_info *gi_ptr1; gi_ptr1 = find_match_gcov_info (tgt_infos, tgt_cnt, gi_ptr); if (gi_ptr1 == NULL) { in_src_not_tgt[unmatch_info_cnt++] = gi_ptr; continue; } gcov_merge (gi_ptr1, gi_ptr, w2); } /* For modules in src but not in tgt. We adjust the counter and append. */ for (i = 0; i < unmatch_info_cnt; i++) { gi_ptr = in_src_not_tgt[i]; gcov_merge (gi_ptr, gi_ptr, w2 - 1); tgt_tail->next = gi_ptr; tgt_tail = gi_ptr; } return 0; } typedef gcov_type (*counter_op_fn) (gcov_type, void*, void*); /* Performing FN upon arc counters. */ static void __gcov_add_counter_op (gcov_type *counters, unsigned n_counters, counter_op_fn fn, void *data1, void *data2) { for (; n_counters; counters++, n_counters--) { gcov_type val = *counters; *counters = fn(val, data1, data2); } } /* Performing FN upon ior counters. */ static void __gcov_ior_counter_op (gcov_type *counters ATTRIBUTE_UNUSED, unsigned n_counters ATTRIBUTE_UNUSED, counter_op_fn fn ATTRIBUTE_UNUSED, void *data1 ATTRIBUTE_UNUSED, void *data2 ATTRIBUTE_UNUSED) { /* Do nothing. */ } /* Performing FN upon time-profile counters. */ static void __gcov_time_profile_counter_op (gcov_type *counters ATTRIBUTE_UNUSED, unsigned n_counters ATTRIBUTE_UNUSED, counter_op_fn fn ATTRIBUTE_UNUSED, void *data1 ATTRIBUTE_UNUSED, void *data2 ATTRIBUTE_UNUSED) { /* Do nothing. */ } /* Performaing FN upon delta counters. */ static void __gcov_delta_counter_op (gcov_type *counters, unsigned n_counters, counter_op_fn fn, void *data1, void *data2) { unsigned i, n_measures; gcc_assert (!(n_counters % 4)); n_measures = n_counters / 4; for (i = 0; i < n_measures; i++, counters += 4) { counters[2] = fn (counters[2], data1, data2); counters[3] = fn (counters[3], data1, data2); } } /* Performing FN upon single counters. */ static void __gcov_single_counter_op (gcov_type *counters, unsigned n_counters, counter_op_fn fn, void *data1, void *data2) { unsigned i, n_measures; gcc_assert (!(n_counters % 3)); n_measures = n_counters / 3; for (i = 0; i < n_measures; i++, counters += 3) { counters[1] = fn (counters[1], data1, data2); counters[2] = fn (counters[2], data1, data2); } } /* Performing FN upon indirect-call profile counters. */ static void __gcov_icall_topn_counter_op (gcov_type *counters, unsigned n_counters, counter_op_fn fn, void *data1, void *data2) { unsigned i; gcc_assert (!(n_counters % GCOV_ICALL_TOPN_NCOUNTS)); for (i = 0; i < n_counters; i += GCOV_ICALL_TOPN_NCOUNTS) { unsigned j; gcov_type *value_array = &counters[i + 1]; for (j = 0; j < GCOV_ICALL_TOPN_NCOUNTS - 1; j += 2) value_array[j + 1] = fn (value_array[j + 1], data1, data2); } } /* Scaling the counter value V by multiplying *(float*) DATA1. */ static gcov_type fp_scale (gcov_type v, void *data1, void *data2 ATTRIBUTE_UNUSED) { float f = *(float *) data1; return (gcov_type) (v * f); } /* Scaling the counter value V by multiplying DATA2/DATA1. */ static gcov_type int_scale (gcov_type v, void *data1, void *data2) { int n = *(int *) data1; int d = *(int *) data2; return (gcov_type) ( RDIV (v,d) * n); } /* Type of function used to process counters. */ typedef void (*gcov_counter_fn) (gcov_type *, gcov_unsigned_t, counter_op_fn, void *, void *); /* Function array to process profile counters. */ #define DEF_GCOV_COUNTER(COUNTER, NAME, FN_TYPE) \ __gcov ## FN_TYPE ## _counter_op, static gcov_counter_fn ctr_functions[GCOV_COUNTERS] = { #include "gcov-counter.def" }; #undef DEF_GCOV_COUNTER /* Driver for scaling profile counters. */ int gcov_profile_scale (struct gcov_info *profile, float scale_factor, int n, int d) { struct gcov_info *gi_ptr; unsigned f_ix; if (verbose) fnotice (stdout, "scale_factor is %f or %d/%d\n", scale_factor, n, d); /* Scaling the counters. */ for (gi_ptr = profile; gi_ptr; gi_ptr = gi_ptr->next) for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++) { unsigned t_ix; const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix]; const struct gcov_ctr_info *ci_ptr; if (!gfi_ptr || gfi_ptr->key != gi_ptr) continue; ci_ptr = gfi_ptr->ctrs; for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++) { gcov_merge_fn merge = gi_ptr->merge[t_ix]; if (!merge) continue; if (d == 0) (*ctr_functions[t_ix]) (ci_ptr->values, ci_ptr->num, fp_scale, &scale_factor, NULL); else (*ctr_functions[t_ix]) (ci_ptr->values, ci_ptr->num, int_scale, &n, &d); ci_ptr++; } } return 0; } /* Driver to normalize profile counters. */ int gcov_profile_normalize (struct gcov_info *profile, gcov_type max_val) { struct gcov_info *gi_ptr; gcov_type curr_max_val = 0; unsigned f_ix; unsigned int i; float scale_factor; /* Find the largest count value. */ for (gi_ptr = profile; gi_ptr; gi_ptr = gi_ptr->next) for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++) { unsigned t_ix; const struct gcov_fn_info *gfi_ptr = gi_ptr->functions[f_ix]; const struct gcov_ctr_info *ci_ptr; if (!gfi_ptr || gfi_ptr->key != gi_ptr) continue; ci_ptr = gfi_ptr->ctrs; for (t_ix = 0; t_ix < 1; t_ix++) { for (i = 0; i < ci_ptr->num; i++) if (ci_ptr->values[i] > curr_max_val) curr_max_val = ci_ptr->values[i]; ci_ptr++; } } scale_factor = (float)max_val / curr_max_val; if (verbose) fnotice (stdout, "max_val is %" PRId64 "\n", curr_max_val); return gcov_profile_scale (profile, scale_factor, 0, 0); } /* The following variables are defined in gcc/gcov-tool.c. */ extern int overlap_func_level; extern int overlap_obj_level; extern int overlap_hot_only; extern int overlap_use_fullname; extern double overlap_hot_threshold; /* Compute the overlap score of two values. The score is defined as: min (V1/SUM_1, V2/SUM_2) */ static double calculate_2_entries (const unsigned long v1, const unsigned long v2, const double sum_1, const double sum_2) { double val1 = (sum_1 == 0.0 ? 0.0 : v1/sum_1); double val2 = (sum_2 == 0.0 ? 0.0 : v2/sum_2); if (val2 < val1) val1 = val2; return val1; } /* Compute the overlap score between GCOV_INFO1 and GCOV_INFO2. SUM_1 is the sum_all for profile1 where GCOV_INFO1 belongs. SUM_2 is the sum_all for profile2 where GCOV_INFO2 belongs. This function also updates cumulative score CUM_1_RESULT and CUM_2_RESULT. */ static double compute_one_gcov (const struct gcov_info *gcov_info1, const struct gcov_info *gcov_info2, const double sum_1, const double sum_2, double *cum_1_result, double *cum_2_result) { unsigned f_ix; double ret = 0; double cum_1 = 0, cum_2 = 0; const struct gcov_info *gcov_info = 0; double *cum_p; double sum; gcc_assert (gcov_info1 || gcov_info2); if (!gcov_info1) { gcov_info = gcov_info2; cum_p = cum_2_result; sum = sum_2; *cum_1_result = 0; } else if (!gcov_info2) { gcov_info = gcov_info1; cum_p = cum_1_result; sum = sum_1; *cum_2_result = 0; } if (gcov_info) { for (f_ix = 0; f_ix < gcov_info->n_functions; f_ix++) { unsigned t_ix; const struct gcov_fn_info *gfi_ptr = gcov_info->functions[f_ix]; if (!gfi_ptr || gfi_ptr->key != gcov_info) continue; const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs; for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++) { unsigned c_num; if (!gcov_info->merge[t_ix]) continue; for (c_num = 0; c_num < ci_ptr->num; c_num++) { cum_1 += ci_ptr->values[c_num] / sum; } ci_ptr++; } } *cum_p = cum_1; return 0.0; } for (f_ix = 0; f_ix < gcov_info1->n_functions; f_ix++) { unsigned t_ix; double func_cum_1 = 0.0; double func_cum_2 = 0.0; double func_val = 0.0; int nonzero = 0; int hot = 0; const struct gcov_fn_info *gfi_ptr1 = gcov_info1->functions[f_ix]; const struct gcov_fn_info *gfi_ptr2 = gcov_info2->functions[f_ix]; if (!gfi_ptr1 || gfi_ptr1->key != gcov_info1) continue; if (!gfi_ptr2 || gfi_ptr2->key != gcov_info2) continue; const struct gcov_ctr_info *ci_ptr1 = gfi_ptr1->ctrs; const struct gcov_ctr_info *ci_ptr2 = gfi_ptr2->ctrs; for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++) { unsigned c_num; if (!gcov_info1->merge[t_ix]) continue; for (c_num = 0; c_num < ci_ptr1->num; c_num++) { if (ci_ptr1->values[c_num] | ci_ptr2->values[c_num]) { func_val += calculate_2_entries (ci_ptr1->values[c_num], ci_ptr2->values[c_num], sum_1, sum_2); func_cum_1 += ci_ptr1->values[c_num] / sum_1; func_cum_2 += ci_ptr2->values[c_num] / sum_2; nonzero = 1; if (ci_ptr1->values[c_num] / sum_1 >= overlap_hot_threshold || ci_ptr2->values[c_num] / sum_2 >= overlap_hot_threshold) hot = 1; } } ci_ptr1++; ci_ptr2++; } ret += func_val; cum_1 += func_cum_1; cum_2 += func_cum_2; if (overlap_func_level && nonzero && (!overlap_hot_only || hot)) { printf(" \tfunc_id=%10d \toverlap =%6.5f%% (%5.5f%% %5.5f%%)\n", gfi_ptr1->ident, func_val*100, func_cum_1*100, func_cum_2*100); } } *cum_1_result = cum_1; *cum_2_result = cum_2; return ret; } /* Test if all counter values in this GCOV_INFO are cold. "Cold" is defined as the counter value being less than or equal to THRESHOLD. */ static bool gcov_info_count_all_cold (const struct gcov_info *gcov_info, gcov_type threshold) { unsigned f_ix; for (f_ix = 0; f_ix < gcov_info->n_functions; f_ix++) { unsigned t_ix; const struct gcov_fn_info *gfi_ptr = gcov_info->functions[f_ix]; if (!gfi_ptr || gfi_ptr->key != gcov_info) continue; const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs; for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++) { unsigned c_num; if (!gcov_info->merge[t_ix]) continue; for (c_num = 0; c_num < ci_ptr->num; c_num++) { if (ci_ptr->values[c_num] > threshold) return false; } ci_ptr++; } } return true; } /* Test if all counter values in this GCOV_INFO are 0. */ static bool gcov_info_count_all_zero (const struct gcov_info *gcov_info) { return gcov_info_count_all_cold (gcov_info, 0); } /* A pair of matched GCOV_INFO. The flag is a bitvector: b0: obj1's all counts are 0; b1: obj1's all counts are cold (but no 0); b2: obj1 is hot; b3: no obj1 to match obj2; b4: obj2's all counts are 0; b5: obj2's all counts are cold (but no 0); b6: obj2 is hot; b7: no obj2 to match obj1; */ struct overlap_t { const struct gcov_info *obj1; const struct gcov_info *obj2; char flag; }; #define FLAG_BOTH_ZERO(flag) ((flag & 0x1) && (flag & 0x10)) #define FLAG_BOTH_COLD(flag) ((flag & 0x2) && (flag & 0x20)) #define FLAG_ONE_HOT(flag) ((flag & 0x4) || (flag & 0x40)) /* Cumlative overlap dscore for profile1 and profile2. */ static double overlap_sum_1, overlap_sum_2; /* sum_all for profile1 and profile2. */ static gcov_type p1_sum_all, p2_sum_all; /* run_max for profile1 and profile2. */ static gcov_type p1_run_max, p2_run_max; /* The number of gcda files in the profiles. */ static unsigned gcda_files[2]; /* The number of unique gcda files in the profiles (not existing in the other profile). */ static unsigned unique_gcda_files[2]; /* The number of gcda files that all counter values are 0. */ static unsigned zero_gcda_files[2]; /* The number of gcda files that all counter values are cold (but not 0). */ static unsigned cold_gcda_files[2]; /* The number of gcda files that includes hot counter values. */ static unsigned hot_gcda_files[2]; /* The number of gcda files with hot count value in either profiles. */ static unsigned both_hot_cnt; /* The number of gcda files with all counts cold (but not 0) in both profiles. */ static unsigned both_cold_cnt; /* The number of gcda files with all counts 0 in both profiles. */ static unsigned both_zero_cnt; /* Extract the basename of the filename NAME. */ static char * extract_file_basename (const char *name) { char *str; int len = 0; char *path = xstrdup (name); char sep_str[2]; sep_str[0] = DIR_SEPARATOR; sep_str[1] = 0; str = strstr(path, sep_str); do{ len = strlen(str) + 1; path = &path[strlen(path) - len + 2]; str = strstr(path, sep_str); } while(str); return path; } /* Utility function to get the filename. */ static const char * get_file_basename (const char *name) { if (overlap_use_fullname) return name; return extract_file_basename (name); } /* A utility function to set the flag for the gcda files. */ static void set_flag (struct overlap_t *e) { char flag = 0; if (!e->obj1) { unique_gcda_files[1]++; flag = 0x8; } else { gcda_files[0]++; if (gcov_info_count_all_zero (e->obj1)) { zero_gcda_files[0]++; flag = 0x1; } else if (gcov_info_count_all_cold (e->obj1, overlap_sum_1 * overlap_hot_threshold)) { cold_gcda_files[0]++; flag = 0x2; } else { hot_gcda_files[0]++; flag = 0x4; } } if (!e->obj2) { unique_gcda_files[0]++; flag |= (0x8 << 4); } else { gcda_files[1]++; if (gcov_info_count_all_zero (e->obj2)) { zero_gcda_files[1]++; flag |= (0x1 << 4); } else if (gcov_info_count_all_cold (e->obj2, overlap_sum_2 * overlap_hot_threshold)) { cold_gcda_files[1]++; flag |= (0x2 << 4); } else { hot_gcda_files[1]++; flag |= (0x4 << 4); } } gcc_assert (flag); e->flag = flag; } /* Test if INFO1 and INFO2 are from the matched source file. Return 1 if they match; return 0 otherwise. */ static int matched_gcov_info (const struct gcov_info *info1, const struct gcov_info *info2) { /* For FDO, we have to match the name. This can be expensive. Maybe we should use hash here. */ if (strcmp (info1->filename, info2->filename)) return 0; if (info1->n_functions != info2->n_functions) { fnotice (stderr, "mismatched profiles in %s (%d functions" " vs %d functions)\n", info1->filename, info1->n_functions, info2->n_functions); return 0; } return 1; } /* Defined in libgcov-driver.c. */ extern gcov_unsigned_t compute_summary (struct gcov_info *, struct gcov_summary *, size_t *); /* Compute the overlap score of two profiles with the head of GCOV_LIST1 and GCOV_LIST1. Return a number ranging from [0.0, 1.0], with 0.0 meaning no match and 1.0 meaning a perfect match. */ static double calculate_overlap (struct gcov_info *gcov_list1, struct gcov_info *gcov_list2) { struct gcov_summary this_prg; unsigned list1_cnt = 0, list2_cnt= 0, all_cnt; unsigned int i, j; size_t max_length; const struct gcov_info *gi_ptr; struct overlap_t *all_infos; compute_summary (gcov_list1, &this_prg, &max_length); overlap_sum_1 = (double) (this_prg.ctrs[0].sum_all); p1_sum_all = this_prg.ctrs[0].sum_all; p1_run_max = this_prg.ctrs[0].run_max; compute_summary (gcov_list2, &this_prg, &max_length); overlap_sum_2 = (double) (this_prg.ctrs[0].sum_all); p2_sum_all = this_prg.ctrs[0].sum_all; p2_run_max = this_prg.ctrs[0].run_max; for (gi_ptr = gcov_list1; gi_ptr; gi_ptr = gi_ptr->next) list1_cnt++; for (gi_ptr = gcov_list2; gi_ptr; gi_ptr = gi_ptr->next) list2_cnt++; all_cnt = list1_cnt + list2_cnt; all_infos = (struct overlap_t *) xmalloc (sizeof (struct overlap_t) * all_cnt * 2); gcc_assert (all_infos); i = 0; for (gi_ptr = gcov_list1; gi_ptr; gi_ptr = gi_ptr->next, i++) { all_infos[i].obj1 = gi_ptr; all_infos[i].obj2 = 0; } for (gi_ptr = gcov_list2; gi_ptr; gi_ptr = gi_ptr->next, i++) { all_infos[i].obj1 = 0; all_infos[i].obj2 = gi_ptr; } for (i = list1_cnt; i < all_cnt; i++) { if (all_infos[i].obj2 == 0) continue; for (j = 0; j < list1_cnt; j++) { if (all_infos[j].obj2 != 0) continue; if (matched_gcov_info (all_infos[i].obj2, all_infos[j].obj1)) { all_infos[j].obj2 = all_infos[i].obj2; all_infos[i].obj2 = 0; break; } } } for (i = 0; i < all_cnt; i++) if (all_infos[i].obj1 || all_infos[i].obj2) { set_flag (all_infos + i); if (FLAG_ONE_HOT (all_infos[i].flag)) both_hot_cnt++; if (FLAG_BOTH_COLD(all_infos[i].flag)) both_cold_cnt++; if (FLAG_BOTH_ZERO(all_infos[i].flag)) both_zero_cnt++; } double prg_val = 0; double sum_val = 0; double sum_cum_1 = 0; double sum_cum_2 = 0; for (i = 0; i < all_cnt; i++) { double val; double cum_1, cum_2; const char *filename; if (all_infos[i].obj1 == 0 && all_infos[i].obj2 == 0) continue; if (FLAG_BOTH_ZERO (all_infos[i].flag)) continue; if (all_infos[i].obj1) filename = get_file_basename (all_infos[i].obj1->filename); else filename = get_file_basename (all_infos[i].obj2->filename); if (overlap_func_level) printf("\n processing %36s:\n", filename); val = compute_one_gcov (all_infos[i].obj1, all_infos[i].obj2, overlap_sum_1, overlap_sum_2, &cum_1, &cum_2); if (overlap_obj_level && (!overlap_hot_only || FLAG_ONE_HOT (all_infos[i].flag))) { printf(" obj=%36s overlap = %6.2f%% (%5.2f%% %5.2f%%)\n", filename, val*100, cum_1*100, cum_2*100); sum_val += val; sum_cum_1 += cum_1; sum_cum_2 += cum_2; } prg_val += val; } if (overlap_obj_level) printf(" SUM:%36s overlap = %6.2f%% (%5.2f%% %5.2f%%)\n", "", sum_val*100, sum_cum_1*100, sum_cum_2*100); printf (" Statistics:\n" " profile1_# profile2_# overlap_#\n"); printf (" gcda files: %12u\t%12u\t%12u\n", gcda_files[0], gcda_files[1], gcda_files[0]-unique_gcda_files[0]); printf (" unique files: %12u\t%12u\n", unique_gcda_files[0], unique_gcda_files[1]); printf (" hot files: %12u\t%12u\t%12u\n", hot_gcda_files[0], hot_gcda_files[1], both_hot_cnt); printf (" cold files: %12u\t%12u\t%12u\n", cold_gcda_files[0], cold_gcda_files[1], both_cold_cnt); printf (" zero files: %12u\t%12u\t%12u\n", zero_gcda_files[0], zero_gcda_files[1], both_zero_cnt); printf (" sum_all: %12" PRId64 "\t%12" PRId64 "\n", p1_sum_all, p2_sum_all); printf (" run_max: %12" PRId64 "\t%12" PRId64 "\n", p1_run_max, p2_run_max); return prg_val; } /* Computer the overlap score of two lists of gcov_info objects PROFILE1 and PROFILE2. Return 0 on success: without mismatch. Reutrn 1 on error. */ int gcov_profile_overlap (struct gcov_info *profile1, struct gcov_info *profile2) { double result; result = calculate_overlap (profile1, profile2); if (result > 0) { printf("\nProgram level overlap result is %3.2f%%\n\n", result*100); return 0; } return 1; }