| /* Routines required for instrumenting a program. */ |
| /* Compile this one with gcc. */ |
| /* Copyright (C) 1989-2013 Free Software Foundation, Inc. |
| |
| 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/>. */ |
| |
| #include "tconfig.h" |
| #include "tsystem.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "libgcc_tm.h" |
| #include "gthr.h" |
| |
| #if 1 |
| #define THREAD_PREFIX __thread |
| #else |
| #define THREAD_PREFIX |
| #endif |
| |
| #if defined(inhibit_libc) |
| #define IN_LIBGCOV (-1) |
| #else |
| #define IN_LIBGCOV 1 |
| #if defined(L_gcov) |
| #define GCOV_LINKAGE /* nothing */ |
| #endif |
| #endif |
| |
| #include "gcov-io.h" |
| |
| #if defined(inhibit_libc) |
| /* If libc and its header files are not available, provide dummy functions. */ |
| |
| #ifdef L_gcov |
| void __gcov_init (struct gcov_info *p __attribute__ ((unused))) {} |
| void __gcov_flush (void) {} |
| #endif |
| |
| #ifdef L_gcov_reset |
| void __gcov_reset (void) {} |
| #endif |
| |
| #ifdef L_gcov_dump |
| void __gcov_dump (void) {} |
| #endif |
| |
| #ifdef L_gcov_merge_add |
| void __gcov_merge_add (gcov_type *counters __attribute__ ((unused)), |
| unsigned n_counters __attribute__ ((unused))) {} |
| #endif |
| |
| #ifdef L_gcov_merge_single |
| void __gcov_merge_single (gcov_type *counters __attribute__ ((unused)), |
| unsigned n_counters __attribute__ ((unused))) {} |
| #endif |
| |
| #ifdef L_gcov_merge_delta |
| void __gcov_merge_delta (gcov_type *counters __attribute__ ((unused)), |
| unsigned n_counters __attribute__ ((unused))) {} |
| #endif |
| |
| #else |
| |
| #include <string.h> |
| #if GCOV_LOCKED |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <sys/stat.h> |
| #endif |
| |
| extern void gcov_clear (void) ATTRIBUTE_HIDDEN; |
| extern void gcov_exit (void) ATTRIBUTE_HIDDEN; |
| extern int gcov_dump_complete ATTRIBUTE_HIDDEN; |
| |
| #ifdef L_gcov |
| #include "gcov-io.c" |
| |
| /* Create a strong reference to these symbols so that they are |
| unconditionally pulled into the instrumented binary, even when |
| the only reference is a weak reference. This is necessary because |
| we are using weak references to handle older compilers that |
| pre-date these new functions. A subtlety of the linker is that |
| it will only resolve weak references defined within archive libraries |
| when there is a string reference to something else defined within |
| the same object file. Since these two functions are defined within |
| their own object files (using L_gcov_reset and L_gcov_dump), they |
| would not get resolved. Since there are symbols within the main L_gcov |
| section that are strongly referenced during -fprofile-generate builds, |
| these symbols will always need to be resolved. */ |
| void (*__gcov_dummy_ref1)() = &__gcov_reset; |
| void (*__gcov_dummy_ref2)() = &__gcov_dump; |
| |
| |
| /* Default callback function for profile instrumentation callback. */ |
| __attribute__((weak)) void |
| __coverage_callback (gcov_type funcdef_no __attribute__ ((unused)), |
| int edge_no __attribute__ ((unused))) |
| { |
| /* nothing */ |
| } |
| |
| |
| /* Utility function for outputing errors. */ |
| static int |
| gcov_error (const char *fmt, ...) |
| { |
| int ret; |
| va_list argp; |
| va_start (argp, fmt); |
| ret = vfprintf (stderr, fmt, argp); |
| va_end (argp); |
| return ret; |
| } |
| |
| /* Emitted in coverage.c. */ |
| |
| /* Sampling period. */ |
| extern gcov_unsigned_t __gcov_sampling_period; |
| extern gcov_unsigned_t __gcov_has_sampling; |
| static int gcov_sampling_period_initialized = 0; |
| void __gcov_set_sampling_period (unsigned int period); |
| unsigned int __gcov_sampling_enabled (); |
| |
| /* Set sampling period to PERIOD. */ |
| |
| void __gcov_set_sampling_period (unsigned int period) |
| { |
| gcc_assert (__gcov_has_sampling); |
| __gcov_sampling_period = period; |
| } |
| |
| unsigned int __gcov_sampling_enabled () |
| { |
| return __gcov_has_sampling; |
| } |
| |
| /* Profile directory prefix specified to -fprofile-generate=. */ |
| extern char * __gcov_profile_prefix; |
| |
| char *__gcov_get_profile_prefix () |
| { |
| return __gcov_profile_prefix; |
| } |
| |
| /* Per thread sample counter. */ |
| THREAD_PREFIX gcov_unsigned_t __gcov_sample_counter = 0; |
| |
| struct gcov_summary_buffer |
| { |
| struct gcov_summary_buffer *next; |
| struct gcov_summary summary; |
| }; |
| |
| static struct gcov_summary_buffer *next_sum_buffer, *sum_buffer; |
| static struct gcov_summary_buffer **sum_tail; |
| |
| /* Chain of per-object gcov structures. */ |
| extern struct gcov_info *__gcov_list; |
| |
| /* A program checksum allows us to distinguish program data for an |
| object file included in multiple programs. */ |
| static gcov_unsigned_t gcov_crc32; |
| |
| /* Size of the longest file name. */ |
| static size_t gcov_max_filename = 0; |
| |
| /* Unique identifier assigned to each module (object file). */ |
| static gcov_unsigned_t gcov_cur_module_id = 0; |
| |
| /* Pointer to the direct-call counters (per call-site counters). |
| Initialized by the caller. */ |
| THREAD_PREFIX gcov_type *__gcov_direct_call_counters ATTRIBUTE_HIDDEN; |
| |
| /* Direct call callee address. */ |
| THREAD_PREFIX void *__gcov_direct_call_callee ATTRIBUTE_HIDDEN; |
| |
| /* Pointer to the indirect-call counters (per call-site counters). |
| Initialized by the caller. */ |
| THREAD_PREFIX gcov_type *__gcov_indirect_call_topn_counters ATTRIBUTE_HIDDEN; |
| |
| /* Indirect call callee address. */ |
| THREAD_PREFIX void *__gcov_indirect_call_topn_callee ATTRIBUTE_HIDDEN; |
| |
| /* Dynamic call graph build and form module groups. */ |
| void __gcov_compute_module_groups (void) ATTRIBUTE_HIDDEN; |
| void __gcov_finalize_dyn_callgraph (void) ATTRIBUTE_HIDDEN; |
| |
| /* Profile summary for the gdca file, used in sanity check? */ |
| static struct gcov_summary all; |
| |
| /* Profile summary for this program in current exeuction. */ |
| static struct gcov_summary this_program; |
| |
| /* Merged profile summary for this program. */ |
| static struct gcov_summary program; |
| |
| /* Record the position of summary info. */ |
| static gcov_position_t summary_pos = 0; |
| |
| /* Record the postion of eof. */ |
| static gcov_position_t eof_pos = 0; |
| |
| /* Number of chars in prefix to be stripped. */ |
| static int gcov_prefix_strip = 0; |
| |
| /* The length of path prefix. */ |
| static size_t prefix_length = 0; |
| |
| /* gi_filename is current object filename. |
| gi_filename_up points to the stripped filename. */ |
| static char *gi_filename, *gi_filename_up; |
| |
| static int gcov_open_by_filename (char * gi_filename); |
| static int gcov_exit_init (void); |
| static void gcov_dump_one_gcov (struct gcov_info *gi_ptr); |
| |
| /* Flag when the profile has already been dumped via __gcov_dump(). */ |
| int gcov_dump_complete = 0; |
| |
| /* Make sure path component of the given FILENAME exists, create |
| missing directories. FILENAME must be writable. |
| Returns zero on success, or -1 if an error occurred. */ |
| |
| static int |
| create_file_directory (char *filename) |
| { |
| #if !defined(TARGET_POSIX_IO) && !defined(_WIN32) |
| (void) filename; |
| return -1; |
| #else |
| char *s; |
| |
| s = filename; |
| |
| if (HAS_DRIVE_SPEC(s)) |
| s += 2; |
| if (IS_DIR_SEPARATOR(*s)) |
| ++s; |
| for (; *s != '\0'; s++) |
| if (IS_DIR_SEPARATOR(*s)) |
| { |
| char sep = *s; |
| *s = '\0'; |
| |
| /* Try to make directory if it doesn't already exist. */ |
| if (access (filename, F_OK) == -1 |
| #ifdef TARGET_POSIX_IO |
| && mkdir (filename, 0755) == -1 |
| #else |
| && mkdir (filename) == -1 |
| #endif |
| /* The directory might have been made by another process. */ |
| && errno != EEXIST) |
| { |
| fprintf (stderr, "profiling:%s:Cannot create directory\n", |
| filename); |
| *s = sep; |
| return -1; |
| }; |
| |
| *s = sep; |
| }; |
| return 0; |
| #endif |
| } |
| |
| /* Open a file with the specified name. */ |
| |
| static int |
| gcov_open_by_filename (char * gi_filename) |
| { |
| if (!gcov_open (gi_filename)) |
| { |
| /* Open failed likely due to missed directory. |
| Create directory and retry to open file. */ |
| if (create_file_directory (gi_filename)) |
| { |
| gcov_error ("profiling:%s:Skip\n", gi_filename); |
| return -1; |
| } |
| if (!gcov_open (gi_filename)) |
| { |
| gcov_error ("profiling:%s:Cannot open\n", gi_filename); |
| return -1; |
| } |
| } |
| return 0; |
| } |
| |
| |
| /* Determine whether a counter is active. */ |
| |
| static inline int |
| gcov_counter_active (const struct gcov_info *info, unsigned int type) |
| { |
| return (info->merge[type] != 0); |
| } |
| |
| |
| /* Add an unsigned value to the current crc */ |
| |
| static gcov_unsigned_t |
| crc32_unsigned (gcov_unsigned_t crc32, gcov_unsigned_t value) |
| { |
| unsigned ix; |
| |
| for (ix = 32; ix--; value <<= 1) |
| { |
| unsigned feedback; |
| |
| feedback = (value ^ crc32) & 0x80000000 ? 0x04c11db7 : 0; |
| crc32 <<= 1; |
| crc32 ^= feedback; |
| } |
| |
| return crc32; |
| } |
| |
| /* Check if VERSION of the info block PTR matches libgcov one. |
| Return 1 on success, or zero in case of versions mismatch. |
| If FILENAME is not NULL, its value used for reporting purposes |
| instead of value from the info block. */ |
| |
| static int |
| gcov_version (struct gcov_info *ptr __attribute__ ((unused)), |
| gcov_unsigned_t version, const char *filename) |
| { |
| if (version != GCOV_VERSION) |
| { |
| char v[4], e[4]; |
| |
| GCOV_UNSIGNED2STRING (v, version); |
| GCOV_UNSIGNED2STRING (e, GCOV_VERSION); |
| |
| if (filename) |
| gcov_error ("profiling:%s:Version mismatch - expected %.4s got %.4s\n", |
| filename, e, v); |
| else |
| gcov_error ("profiling:Version mismatch - expected %.4s got %.4s\n", e, v); |
| return 0; |
| } |
| return 1; |
| } |
| |
| #define GCOV_GET_FILENAME gcov_strip_leading_dirs |
| |
| /* Insert counter VALUE into HISTOGRAM. */ |
| |
| static void |
| gcov_histogram_insert(gcov_bucket_type *histogram, gcov_type value) |
| { |
| unsigned i; |
| |
| i = gcov_histo_index(value); |
| histogram[i].num_counters++; |
| histogram[i].cum_value += value; |
| if (value < histogram[i].min_value) |
| histogram[i].min_value = value; |
| } |
| |
| /* Computes a histogram of the arc counters to place in the summary SUM. */ |
| |
| static void |
| gcov_compute_histogram (struct gcov_summary *sum) |
| { |
| struct gcov_info *gi_ptr; |
| const struct gcov_fn_info *gfi_ptr; |
| const struct gcov_ctr_info *ci_ptr; |
| struct gcov_ctr_summary *cs_ptr; |
| unsigned t_ix, f_ix, ctr_info_ix, ix; |
| int h_ix; |
| |
| /* This currently only applies to arc counters. */ |
| t_ix = GCOV_COUNTER_ARCS; |
| |
| /* First check if there are any counts recorded for this counter. */ |
| cs_ptr = &(sum->ctrs[t_ix]); |
| if (!cs_ptr->num) |
| return; |
| |
| for (h_ix = 0; h_ix < GCOV_HISTOGRAM_SIZE; h_ix++) |
| { |
| cs_ptr->histogram[h_ix].num_counters = 0; |
| cs_ptr->histogram[h_ix].min_value = cs_ptr->run_max; |
| cs_ptr->histogram[h_ix].cum_value = 0; |
| } |
| |
| /* Walk through all the per-object structures and record each of |
| the count values in histogram. */ |
| for (gi_ptr = __gcov_list; gi_ptr; gi_ptr = gi_ptr->next) |
| { |
| if (!gi_ptr->merge[t_ix]) |
| continue; |
| |
| /* Find the appropriate index into the gcov_ctr_info array |
| for the counter we are currently working on based on the |
| existence of the merge function pointer for this object. */ |
| for (ix = 0, ctr_info_ix = 0; ix < t_ix; ix++) |
| { |
| if (gi_ptr->merge[ix]) |
| ctr_info_ix++; |
| } |
| for (f_ix = 0; f_ix != gi_ptr->n_functions; f_ix++) |
| { |
| gfi_ptr = gi_ptr->functions[f_ix]; |
| |
| if (!gfi_ptr || gfi_ptr->key != gi_ptr) |
| continue; |
| |
| ci_ptr = &gfi_ptr->ctrs[ctr_info_ix]; |
| for (ix = 0; ix < ci_ptr->num; ix++) |
| gcov_histogram_insert (cs_ptr->histogram, ci_ptr->values[ix]); |
| } |
| } |
| } |
| |
| /* Dump the coverage counts. We merge with existing counts when |
| possible, to avoid growing the .da files ad infinitum. We use this |
| program's checksum to make sure we only accumulate whole program |
| statistics to the correct summary. An object file might be embedded |
| in two separate programs, and we must keep the two program |
| summaries separate. */ |
| |
| /* Strip GCOV_PREFIX_STRIP levels of leading '/' from FILENAME and |
| put the result into GI_FILENAME_UP. */ |
| |
| static void |
| gcov_strip_leading_dirs (int prefix_length, int gcov_prefix_strip, |
| const char *filename, char *gi_filename_up) |
| { |
| /* Avoid to add multiple drive letters into combined path. */ |
| if (prefix_length != 0 && HAS_DRIVE_SPEC(filename)) |
| filename += 2; |
| |
| /* Build relocated filename, stripping off leading |
| directories from the initial filename if requested. */ |
| if (gcov_prefix_strip > 0) |
| { |
| int level = 0; |
| const char *s = filename; |
| if (IS_DIR_SEPARATOR(*s)) |
| ++s; |
| |
| /* Skip selected directory levels. */ |
| for (; (*s != '\0') && (level < gcov_prefix_strip); s++) |
| if (IS_DIR_SEPARATOR(*s)) |
| { |
| filename = s; |
| level++; |
| } |
| } |
| |
| /* Update complete filename with stripped original. */ |
| if (prefix_length != 0 && !IS_DIR_SEPARATOR (*filename)) |
| { |
| /* If prefix is given, add directory separator. */ |
| strcpy (gi_filename_up, "/"); |
| strcpy (gi_filename_up + 1, filename); |
| } |
| else |
| strcpy (gi_filename_up, filename); |
| } |
| |
| /* This function allocates the space to store current file name. */ |
| |
| static void |
| gcov_alloc_filename (void) |
| { |
| /* Get file name relocation prefix. Non-absolute values are ignored. */ |
| const char *gcov_prefix = 0; |
| |
| prefix_length = 0; |
| gcov_prefix_strip = 0; |
| |
| { |
| /* Check if the level of dirs to strip off specified. */ |
| char *tmp = getenv ("GCOV_PREFIX_STRIP"); |
| if (tmp) |
| { |
| gcov_prefix_strip = atoi (tmp); |
| /* Do not consider negative values. */ |
| if (gcov_prefix_strip < 0) |
| gcov_prefix_strip = 0; |
| } |
| } |
| |
| /* Get file name relocation prefix. Non-absolute values are ignored. */ |
| gcov_prefix = getenv ("GCOV_PREFIX"); |
| if (gcov_prefix) |
| { |
| prefix_length = strlen(gcov_prefix); |
| |
| /* Remove an unnecessary trailing '/' */ |
| if (IS_DIR_SEPARATOR (gcov_prefix[prefix_length - 1])) |
| prefix_length--; |
| } |
| else |
| prefix_length = 0; |
| |
| /* If no prefix was specified and a prefix stip, then we assume |
| relative. */ |
| if (gcov_prefix_strip != 0 && prefix_length == 0) |
| { |
| gcov_prefix = "."; |
| prefix_length = 1; |
| } |
| |
| /* Allocate and initialize the filename scratch space. */ |
| gi_filename = (char *) malloc (prefix_length + gcov_max_filename + 2); |
| if (prefix_length) |
| memcpy (gi_filename, gcov_prefix, prefix_length); |
| |
| gi_filename_up = gi_filename + prefix_length; |
| } |
| |
| /* Sort N entries in VALUE_ARRAY in descending order. |
| Each entry in VALUE_ARRAY has two values. The sorting |
| is based on the second value. */ |
| |
| GCOV_LINKAGE void |
| gcov_sort_n_vals (gcov_type *value_array, int n) |
| { |
| int j, k; |
| for (j = 2; j < n; j += 2) |
| { |
| gcov_type cur_ent[2]; |
| cur_ent[0] = value_array[j]; |
| cur_ent[1] = value_array[j + 1]; |
| k = j - 2; |
| while (k >= 0 && value_array[k + 1] < cur_ent[1]) |
| { |
| value_array[k + 2] = value_array[k]; |
| value_array[k + 3] = value_array[k+1]; |
| k -= 2; |
| } |
| value_array[k + 2] = cur_ent[0]; |
| value_array[k + 3] = cur_ent[1]; |
| } |
| } |
| |
| /* Sort the profile counters for all indirect call sites. Counters |
| for each call site are allocated in array COUNTERS. */ |
| |
| static void |
| gcov_sort_icall_topn_counter (const struct gcov_ctr_info *counters) |
| { |
| int i; |
| gcov_type *values; |
| int n = counters->num; |
| gcc_assert (!(n % GCOV_ICALL_TOPN_NCOUNTS)); |
| |
| values = counters->values; |
| |
| for (i = 0; i < n; i += GCOV_ICALL_TOPN_NCOUNTS) |
| { |
| gcov_type *value_array = &values[i + 1]; |
| gcov_sort_n_vals (value_array, GCOV_ICALL_TOPN_NCOUNTS - 1); |
| } |
| } |
| |
| /* Write imported files (auxiliary modules) for primary module GI_PTR |
| into file GI_FILENAME. */ |
| |
| static void |
| gcov_write_import_file (char *gi_filename, struct gcov_info *gi_ptr) |
| { |
| char *gi_imports_filename; |
| const char *gcov_suffix; |
| FILE *imports_file; |
| size_t prefix_length, suffix_length; |
| |
| gcov_suffix = getenv ("GCOV_IMPORTS_SUFFIX"); |
| if (!gcov_suffix || !strlen (gcov_suffix)) |
| gcov_suffix = ".imports"; |
| suffix_length = strlen (gcov_suffix); |
| prefix_length = strlen (gi_filename); |
| gi_imports_filename = (char *) alloca (prefix_length + suffix_length + 1); |
| memset (gi_imports_filename, 0, prefix_length + suffix_length + 1); |
| memcpy (gi_imports_filename, gi_filename, prefix_length); |
| memcpy (gi_imports_filename + prefix_length, gcov_suffix, suffix_length); |
| imports_file = fopen (gi_imports_filename, "w"); |
| if (imports_file) |
| { |
| const struct dyn_imp_mod **imp_mods; |
| unsigned i, imp_len; |
| imp_mods = gcov_get_sorted_import_module_array (gi_ptr, &imp_len); |
| if (imp_mods) |
| { |
| for (i = 0; i < imp_len; i++) |
| { |
| fprintf (imports_file, "%s\n", |
| imp_mods[i]->imp_mod->mod_info->source_filename); |
| fprintf (imports_file, "%s%s\n", |
| imp_mods[i]->imp_mod->mod_info->da_filename, GCOV_DATA_SUFFIX); |
| } |
| free (imp_mods); |
| } |
| fclose (imports_file); |
| } |
| } |
| |
| static void |
| gcov_dump_module_info (void) |
| { |
| struct gcov_info *gi_ptr; |
| |
| __gcov_compute_module_groups (); |
| |
| /* Now write out module group info. */ |
| for (gi_ptr = __gcov_list; gi_ptr; gi_ptr = gi_ptr->next) |
| { |
| int error; |
| |
| GCOV_GET_FILENAME (prefix_length, gcov_prefix_strip, gi_ptr->filename, |
| gi_filename_up); |
| error = gcov_open_by_filename (gi_filename); |
| if (error != 0) |
| continue; |
| |
| /* Overwrite the zero word at the of the file. */ |
| gcov_rewrite (); |
| gcov_seek (gi_ptr->eof_pos); |
| |
| gcov_write_module_infos (gi_ptr); |
| /* Write the end marker */ |
| gcov_write_unsigned (0); |
| gcov_truncate (); |
| |
| if ((error = gcov_close ())) |
| gcov_error (error < 0 ? "profiling:%s:Overflow writing\n" : |
| "profiling:%s:Error writing\n", |
| gi_filename); |
| gcov_write_import_file (gi_filename, gi_ptr); |
| } |
| __gcov_finalize_dyn_callgraph (); |
| } |
| |
| /* Dump the coverage counts. We merge with existing counts when |
| possible, to avoid growing the .da files ad infinitum. We use this |
| program's checksum to make sure we only accumulate whole program |
| statistics to the correct summary. An object file might be embedded |
| in two separate programs, and we must keep the two program |
| summaries separate. */ |
| |
| void |
| gcov_exit (void) |
| { |
| struct gcov_info *gi_ptr; |
| int dump_module_info; |
| |
| /* Prevent the counters from being dumped a second time on exit when the |
| application already wrote out the profile using __gcov_dump(). */ |
| if (gcov_dump_complete) |
| return; |
| |
| dump_module_info = gcov_exit_init (); |
| |
| for (gi_ptr = __gcov_list; gi_ptr; gi_ptr = gi_ptr->next) |
| gcov_dump_one_gcov (gi_ptr); |
| |
| if (dump_module_info) |
| gcov_dump_module_info (); |
| |
| free (gi_filename); |
| } |
| |
| /* Reset all counters to zero. */ |
| |
| void |
| gcov_clear (void) |
| { |
| const struct gcov_info *gi_ptr; |
| |
| for (gi_ptr = __gcov_list; gi_ptr; gi_ptr = gi_ptr->next) |
| { |
| unsigned f_ix; |
| |
| 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]; |
| |
| if (!gfi_ptr || gfi_ptr->key != gi_ptr) |
| continue; |
| const struct gcov_ctr_info *ci_ptr = gfi_ptr->ctrs; |
| for (t_ix = 0; t_ix != GCOV_COUNTERS; t_ix++) |
| { |
| if (!gi_ptr->merge[t_ix]) |
| continue; |
| |
| memset (ci_ptr->values, 0, sizeof (gcov_type) * ci_ptr->num); |
| ci_ptr++; |
| } |
| } |
| } |
| } |
| |
| /* Add a new object file onto the bb chain. Invoked automatically |
| when running an object file's global ctors. */ |
| |
| void |
| __gcov_init (struct gcov_info *info) |
| { |
| if (!gcov_sampling_period_initialized) |
| { |
| const char* env_value_str = getenv ("GCOV_SAMPLING_PERIOD"); |
| if (env_value_str) |
| { |
| int env_value_int = atoi(env_value_str); |
| if (env_value_int >= 1) |
| __gcov_sampling_period = env_value_int; |
| } |
| gcov_sampling_period_initialized = 1; |
| } |
| |
| if (!info->version || !info->n_functions) |
| return; |
| |
| if (gcov_version (info, info->version, 0)) |
| { |
| const char *ptr = info->filename; |
| size_t filename_length = strlen (info->filename); |
| |
| /* Refresh the longest file name information. */ |
| if (filename_length > gcov_max_filename) |
| gcov_max_filename = filename_length; |
| |
| /* Assign the module ID (starting at 1). */ |
| info->mod_info->ident = (++gcov_cur_module_id); |
| gcc_assert (EXTRACT_MODULE_ID_FROM_GLOBAL_ID (GEN_FUNC_GLOBAL_ID ( |
| info->mod_info->ident, 0)) |
| == info->mod_info->ident); |
| |
| if (!__gcov_list) |
| { |
| atexit (gcov_exit); |
| } |
| |
| info->next = __gcov_list; |
| __gcov_list = info; |
| } |
| info->version = 0; |
| } |
| |
| #ifdef __GTHREAD_MUTEX_INIT |
| ATTRIBUTE_HIDDEN __gthread_mutex_t __gcov_flush_mx = __GTHREAD_MUTEX_INIT; |
| #define init_mx_once() |
| #else |
| __gthread_mutex_t __gcov_flush_mx ATTRIBUTE_HIDDEN; |
| |
| static void |
| init_mx (void) |
| { |
| __GTHREAD_MUTEX_INIT_FUNCTION (&__gcov_flush_mx); |
| } |
| static void |
| init_mx_once (void) |
| { |
| static __gthread_once_t once = __GTHREAD_ONCE_INIT; |
| __gthread_once (&once, init_mx); |
| } |
| #endif |
| |
| /* Called before fork or exec - write out profile information gathered so |
| far and reset it to zero. This avoids duplication or loss of the |
| profile information gathered so far. */ |
| |
| void |
| __gcov_flush (void) |
| { |
| init_mx_once (); |
| __gthread_mutex_lock (&__gcov_flush_mx); |
| |
| gcov_exit (); |
| gcov_clear (); |
| |
| __gthread_mutex_unlock (&__gcov_flush_mx); |
| } |
| |
| static void |
| gcov_sort_topn_counter_arrays (const struct gcov_info *gi_ptr) |
| { |
| unsigned int i; |
| int f_ix; |
| const struct gcov_fn_info *gfi_ptr; |
| const struct gcov_ctr_info *ci_ptr; |
| |
| for (f_ix = 0; (unsigned)f_ix != gi_ptr->n_functions; f_ix++) |
| { |
| gfi_ptr = gi_ptr->functions[f_ix]; |
| ci_ptr = gfi_ptr->ctrs; |
| for (i = 0; i < GCOV_COUNTERS; i++) |
| { |
| if (!gcov_counter_active (gi_ptr, i)) |
| continue; |
| if (i == GCOV_COUNTER_ICALL_TOPNV) |
| { |
| gcov_sort_icall_topn_counter (ci_ptr); |
| break; |
| } |
| ci_ptr++; |
| } |
| } |
| } |
| |
| /* Compute object summary recored in gcov_info INFO. The result is |
| stored in OBJ_SUM. Note that the caller is responsible for |
| zeroing out OBJ_SUM, otherwise the summary is accumulated. */ |
| |
| static void |
| gcov_object_summary (struct gcov_info *info, struct gcov_summary *obj_sum) |
| { |
| const struct gcov_fn_info *gfi_ptr; |
| const struct gcov_ctr_info *ci_ptr; |
| struct gcov_ctr_summary *cs_ptr; |
| gcov_unsigned_t c_num; |
| unsigned t_ix; |
| int f_ix; |
| gcov_unsigned_t crc32 = gcov_crc32; |
| |
| /* Totals for this object file. */ |
| crc32 = crc32_unsigned (crc32, info->stamp); |
| crc32 = crc32_unsigned (crc32, info->n_functions); |
| |
| for (f_ix = 0; (unsigned) f_ix != info->n_functions; f_ix++) |
| { |
| gfi_ptr = info->functions[f_ix]; |
| |
| if (!gfi_ptr || gfi_ptr->key != info) |
| gfi_ptr = 0; |
| |
| crc32 = crc32_unsigned (crc32, gfi_ptr ? gfi_ptr->cfg_checksum : 0); |
| crc32 = crc32_unsigned (crc32, |
| gfi_ptr ? gfi_ptr->lineno_checksum : 0); |
| |
| if (!gfi_ptr) |
| continue; |
| |
| ci_ptr = gfi_ptr->ctrs; |
| for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++) |
| { |
| if (!info->merge[t_ix]) |
| continue; |
| |
| cs_ptr = &(obj_sum->ctrs[t_ix]); |
| cs_ptr->num += ci_ptr->num; |
| crc32 = crc32_unsigned (crc32, ci_ptr->num); |
| |
| for (c_num = 0; c_num < ci_ptr->num; c_num++) |
| { |
| cs_ptr->sum_all += ci_ptr->values[c_num]; |
| if (cs_ptr->run_max < ci_ptr->values[c_num]) |
| cs_ptr->run_max = ci_ptr->values[c_num]; |
| } |
| ci_ptr++; |
| } |
| } |
| gcov_crc32 = crc32; |
| } |
| |
| /* Merge with existing gcda file in the same directory to avoid |
| excessive growthe of the files. */ |
| |
| static int |
| gcov_merge_gcda_file (struct gcov_info *gi_ptr) |
| { |
| struct gcov_ctr_summary *cs_prg, *cs_tprg, *cs_all; |
| unsigned t_ix, f_ix = 0; |
| |
| const struct gcov_fn_info *gfi_ptr; |
| int error = 0; |
| gcov_unsigned_t tag, length, version, stamp; |
| |
| eof_pos = 0; |
| summary_pos = 0; |
| sum_buffer = 0; |
| sum_tail = &sum_buffer; |
| |
| tag = gcov_read_unsigned (); |
| if (tag) |
| { |
| /* Merge data from file. */ |
| if (tag != GCOV_DATA_MAGIC) |
| { |
| gcov_error ("profiling:%s:Not a gcov data file\n", gi_filename); |
| goto read_fatal; |
| } |
| version = gcov_read_unsigned (); |
| if (!gcov_version (gi_ptr, version, gi_filename)) |
| goto read_fatal; |
| |
| stamp = gcov_read_unsigned (); |
| if (stamp != gi_ptr->stamp) |
| /* Read from a different compilation. Overwrite the file. */ |
| goto rewrite; |
| |
| /* Look for program summary. */ |
| for (f_ix = ~0u;;) |
| { |
| struct gcov_summary tmp; |
| |
| eof_pos = gcov_position (); |
| tag = gcov_read_unsigned (); |
| if (tag != GCOV_TAG_PROGRAM_SUMMARY) |
| break; |
| |
| length = gcov_read_unsigned (); |
| gcov_read_summary (&tmp); |
| if ((error = gcov_is_error ())) |
| goto read_error; |
| if (summary_pos) |
| { |
| /* Save all summaries after the one that will be |
| merged into below. These will need to be rewritten |
| as histogram merging may change the number of non-zero |
| histogram entries that will be emitted, and thus the |
| size of the merged summary. */ |
| (*sum_tail) = (struct gcov_summary_buffer *) |
| malloc (sizeof(struct gcov_summary_buffer)); |
| (*sum_tail)->summary = tmp; |
| (*sum_tail)->next = 0; |
| sum_tail = &((*sum_tail)->next); |
| goto next_summary; |
| } |
| if (tmp.checksum != gcov_crc32) |
| goto next_summary; |
| |
| for (t_ix = 0; t_ix != GCOV_COUNTERS_SUMMABLE; t_ix++) |
| if (tmp.ctrs[t_ix].num != this_program.ctrs[t_ix].num) |
| goto next_summary; |
| program = tmp; |
| summary_pos = eof_pos; |
| |
| next_summary:; |
| } |
| |
| /* Merge execution counts for each function. */ |
| for (f_ix = 0; f_ix != gi_ptr->n_functions; |
| f_ix++, tag = gcov_read_unsigned ()) |
| { |
| const struct gcov_ctr_info *ci_ptr; |
| |
| gfi_ptr = gi_ptr->functions[f_ix]; |
| |
| if (tag != GCOV_TAG_FUNCTION) |
| goto read_mismatch; |
| length = gcov_read_unsigned (); |
| |
| if (!length) |
| /* This function did not appear in the other program. |
| We have nothing to merge. */ |
| continue; |
| |
| /* Check function. */ |
| if (length != GCOV_TAG_FUNCTION_LENGTH) |
| goto read_mismatch; |
| |
| gcc_assert (gfi_ptr && gfi_ptr->key == gi_ptr); |
| |
| if (gcov_read_unsigned () != gfi_ptr->ident |
| || gcov_read_unsigned () != gfi_ptr->lineno_checksum |
| || gcov_read_unsigned () != gfi_ptr->cfg_checksum) |
| goto read_mismatch; |
| |
| 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; |
| |
| tag = gcov_read_unsigned (); |
| length = gcov_read_unsigned (); |
| if (tag != GCOV_TAG_FOR_COUNTER (t_ix) |
| || length != GCOV_TAG_COUNTER_LENGTH (ci_ptr->num)) |
| goto read_mismatch; |
| (*merge) (ci_ptr->values, ci_ptr->num); |
| ci_ptr++; |
| } |
| if ((error = gcov_is_error ())) |
| goto read_error; |
| } |
| if (tag && tag != GCOV_TAG_MODULE_INFO) |
| goto read_mismatch; |
| } |
| goto rewrite; |
| |
| read_error:; |
| gcov_error (error < 0 ? "profiling:%s:Overflow merging\n" |
| : "profiling:%s:Error merging\n", gi_filename); |
| goto read_fatal; |
| |
| goto rewrite; |
| |
| read_mismatch:; |
| gcov_error ("profiling:%s:Merge mismatch for %s\n", |
| gi_filename, f_ix + 1 ? "function" : "summaries"); |
| goto read_fatal; |
| |
| read_fatal:; |
| gcov_close (); |
| return 1; |
| |
| rewrite:; |
| gcov_rewrite (); |
| if (!summary_pos) |
| { |
| memset (&program, 0, sizeof (program)); |
| summary_pos = eof_pos; |
| } |
| |
| /* Merge the summaries. */ |
| for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++) |
| { |
| cs_prg = &program.ctrs[t_ix]; |
| cs_tprg = &this_program.ctrs[t_ix]; |
| cs_all = &all.ctrs[t_ix]; |
| |
| if (gi_ptr->merge[t_ix]) |
| { |
| if (!cs_prg->runs++) |
| cs_prg->num = cs_tprg->num; |
| cs_prg->sum_all += cs_tprg->sum_all; |
| if (cs_prg->run_max < cs_tprg->run_max) |
| cs_prg->run_max = cs_tprg->run_max; |
| cs_prg->sum_max += cs_tprg->run_max; |
| if (cs_prg->runs == 1) |
| memcpy (cs_prg->histogram, cs_tprg->histogram, |
| sizeof (gcov_bucket_type) * GCOV_HISTOGRAM_SIZE); |
| else |
| gcov_histogram_merge (cs_prg->histogram, cs_tprg->histogram); |
| } |
| else if (cs_prg->runs) |
| goto read_mismatch; |
| |
| if (!cs_all->runs && cs_prg->runs) |
| memcpy (cs_all, cs_prg, sizeof (*cs_all)); |
| else if (!all.checksum |
| && (!GCOV_LOCKED || cs_all->runs == cs_prg->runs) |
| /* Don't compare the histograms, which may have slight |
| variations depending on the order they were updated |
| due to the truncating integer divides used in the |
| merge. */ |
| && memcmp (cs_all, cs_prg, |
| sizeof (*cs_all) - (sizeof (gcov_bucket_type) |
| * GCOV_HISTOGRAM_SIZE))) |
| { |
| gcov_error ("profiling:%s:Invocation mismatch - " |
| "some data files may have been removed%s\n", |
| gi_filename, GCOV_LOCKED |
| ? "" : " or concurrent update without locking support"); |
| all.checksum = ~0u; |
| } |
| } |
| |
| program.checksum = gcov_crc32; |
| |
| return 0; |
| } |
| |
| /* This function returns the size of gcda file to be written. Note |
| the size is in units of gcov_type. */ |
| |
| GCOV_LINKAGE unsigned |
| gcov_gcda_file_size (struct gcov_info *gi_ptr) |
| { |
| unsigned size; |
| const struct gcov_fn_info *fi_ptr; |
| unsigned f_ix, t_ix, h_ix, h_cnt = 0; |
| unsigned n_counts; |
| const struct gcov_ctr_info *ci_ptr; |
| struct gcov_summary *sum = &this_program; |
| const struct gcov_ctr_summary *csum; |
| |
| /* GCOV_DATA_MAGIC, GCOV_VERSION and time_stamp. */ |
| size = 3; |
| |
| /* Program summary, which depends on the number of non-zero |
| histogram entries. */ |
| csum = &sum->ctrs[GCOV_COUNTER_ARCS]; |
| for (h_ix = 0; h_ix < GCOV_HISTOGRAM_SIZE; h_ix++) |
| { |
| if (csum->histogram[h_ix].num_counters > 0) |
| h_cnt++; |
| } |
| size += 2 + GCOV_TAG_SUMMARY_LENGTH(h_cnt); |
| |
| /* size for each function. */ |
| for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++) |
| { |
| fi_ptr = gi_ptr->functions[f_ix]; |
| |
| size += 2 /* tag_length itself */ |
| + GCOV_TAG_FUNCTION_LENGTH; /* ident, lineno_cksum, cfg_cksm */ |
| |
| ci_ptr = fi_ptr->ctrs; |
| for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++) |
| { |
| if (!gcov_counter_active (gi_ptr, t_ix)) |
| continue; |
| |
| n_counts = ci_ptr->num; |
| size += 2 + GCOV_TAG_COUNTER_LENGTH (n_counts); |
| ci_ptr++; |
| } |
| } |
| |
| size += 1; |
| |
| return size*4; |
| } |
| |
| /* Write profile data (including summary and module grouping information, |
| if available, to file. */ |
| |
| static void |
| gcov_write_gcda_file (struct gcov_info *gi_ptr) |
| { |
| const struct gcov_fn_info *gfi_ptr; |
| const struct gcov_ctr_info *ci_ptr; |
| unsigned t_ix, f_ix, n_counts, length; |
| int error = 0; |
| gcov_position_t eof_pos1 = 0; |
| |
| /* Write out the data. */ |
| gcov_seek (0); |
| gcov_write_tag_length (GCOV_DATA_MAGIC, GCOV_VERSION); |
| gcov_write_unsigned (gi_ptr->stamp); |
| |
| if (summary_pos) |
| gcov_seek (summary_pos); |
| gcc_assert (!summary_pos || summary_pos == gcov_position ()); |
| |
| /* Generate whole program statistics. */ |
| gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, &program); |
| |
| /* Rewrite all the summaries that were after the summary we merged |
| into. This is necessary as the merged summary may have a different |
| size due to the number of non-zero histogram entries changing after |
| merging. */ |
| |
| while (sum_buffer) |
| { |
| gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, &sum_buffer->summary); |
| next_sum_buffer = sum_buffer->next; |
| free (sum_buffer); |
| sum_buffer = next_sum_buffer; |
| } |
| |
| /* Write execution counts for each function. */ |
| for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++) |
| { |
| gfi_ptr = gi_ptr->functions[f_ix]; |
| gcc_assert (gfi_ptr && gfi_ptr->key == gi_ptr); |
| length = GCOV_TAG_FUNCTION_LENGTH; |
| |
| gcov_write_tag_length (GCOV_TAG_FUNCTION, length); |
| |
| gcov_write_unsigned (gfi_ptr->ident); |
| gcov_write_unsigned (gfi_ptr->lineno_checksum); |
| gcov_write_unsigned (gfi_ptr->cfg_checksum); |
| |
| ci_ptr = gfi_ptr->ctrs; |
| for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++) |
| { |
| if (!gi_ptr->merge[t_ix]) |
| continue; |
| |
| n_counts = ci_ptr->num; |
| gcov_write_tag_length (GCOV_TAG_FOR_COUNTER (t_ix), |
| GCOV_TAG_COUNTER_LENGTH (n_counts)); |
| gcov_type *c_ptr = ci_ptr->values; |
| while (n_counts--) |
| gcov_write_counter (*c_ptr++); |
| ci_ptr++; |
| } |
| eof_pos1 = gcov_position (); |
| } |
| |
| eof_pos = eof_pos1; |
| /* Write the end marker */ |
| gcov_write_unsigned (0); |
| |
| gi_ptr->eof_pos = eof_pos; |
| |
| if ((error = gcov_close ())) |
| gcov_error (error < 0 ? |
| "profiling:%s:Overflow writing\n" : |
| "profiling:%s:Error writing\n", |
| gi_filename); |
| } |
| |
| /* Do some preparation work before calling the actual dumping |
| routine. |
| Return: 1 when module grouping info needs to be dumped, |
| 0 otherwise. */ |
| |
| static int |
| gcov_exit_init (void) |
| { |
| struct gcov_info *gi_ptr; |
| int dump_module_info = 0; |
| |
| dump_module_info = 0; |
| gcov_prefix_strip = 0; |
| |
| memset (&all, 0, sizeof (all)); |
| |
| /* Find the totals for this execution. */ |
| memset (&this_program, 0, sizeof (this_program)); |
| for (gi_ptr = __gcov_list; gi_ptr; gi_ptr = gi_ptr->next) |
| { |
| gcov_object_summary (gi_ptr, &this_program); |
| |
| /* The IS_PRIMARY field is overloaded to indicate if this module |
| is FDO/LIPO. */ |
| dump_module_info |= gi_ptr->mod_info->is_primary; |
| } |
| |
| gcov_compute_histogram (&this_program); |
| |
| gcov_alloc_filename (); |
| |
| return dump_module_info; |
| } |
| |
| /* Dump one entry in the gcov_info list (for one object). */ |
| |
| static void |
| gcov_dump_one_gcov (struct gcov_info *gi_ptr) |
| { |
| int ret; |
| |
| gcov_sort_topn_counter_arrays (gi_ptr); |
| |
| GCOV_GET_FILENAME (prefix_length, gcov_prefix_strip, gi_ptr->filename, |
| gi_filename_up); |
| |
| if (gcov_open_by_filename (gi_filename) == -1) |
| return; |
| |
| /* Now merge this file. */ |
| ret = gcov_merge_gcda_file (gi_ptr); |
| if (ret != 0 ) return; |
| |
| gcov_write_gcda_file (gi_ptr); |
| } |
| |
| #endif /* L_gcov */ |
| |
| #ifdef L_gcov_reset |
| |
| /* Function that can be called from application to reset counters to zero, |
| in order to collect profile in region of interest. */ |
| |
| void |
| __gcov_reset (void) |
| { |
| gcov_clear (); |
| /* Re-enable dumping to support collecting profile in multiple regions |
| of interest. */ |
| gcov_dump_complete = 0; |
| } |
| |
| #endif /* L_gcov_reset */ |
| |
| #ifdef L_gcov_dump |
| |
| /* Function that can be called from application to write profile collected |
| so far, in order to collect profile in region of interest. */ |
| |
| void |
| __gcov_dump (void) |
| { |
| gcov_exit (); |
| /* Prevent profile from being dumped a second time on application exit. */ |
| gcov_dump_complete = 1; |
| } |
| |
| #endif /* L_gcov_dump */ |
| |
| #ifdef L_gcov_merge_add |
| /* The profile merging function that just adds the counters. It is given |
| an array COUNTERS of N_COUNTERS old counters and it reads the same number |
| of counters from the gcov file. */ |
| void |
| __gcov_merge_add (gcov_type *counters, unsigned n_counters) |
| { |
| for (; n_counters; counters++, n_counters--) |
| *counters += gcov_read_counter (); |
| } |
| #endif /* L_gcov_merge_add */ |
| |
| #ifdef L_gcov_merge_ior |
| /* The profile merging function that just adds the counters. It is given |
| an array COUNTERS of N_COUNTERS old counters and it reads the same number |
| of counters from the gcov file. */ |
| void |
| __gcov_merge_ior (gcov_type *counters, unsigned n_counters) |
| { |
| for (; n_counters; counters++, n_counters--) |
| *counters |= gcov_read_counter (); |
| } |
| #endif |
| |
| #ifdef L_gcov_merge_dc |
| |
| /* Returns 1 if the function global id GID is not valid. */ |
| |
| static int |
| __gcov_is_gid_insane (gcov_type gid) |
| { |
| if (EXTRACT_MODULE_ID_FROM_GLOBAL_ID (gid) == 0 |
| || EXTRACT_FUNC_ID_FROM_GLOBAL_ID (gid) == 0) |
| return 1; |
| return 0; |
| } |
| |
| /* The profile merging function used for merging direct call counts |
| This function is given array COUNTERS of N_COUNTERS old counters and it |
| reads the same number of counters from the gcov file. */ |
| |
| void |
| __gcov_merge_dc (gcov_type *counters, unsigned n_counters) |
| { |
| unsigned i; |
| |
| gcc_assert (!(n_counters % 2)); |
| for (i = 0; i < n_counters; i += 2) |
| { |
| gcov_type global_id = gcov_read_counter (); |
| gcov_type call_count = gcov_read_counter (); |
| |
| /* Note that global id counter may never have been set if no calls were |
| made from this call-site. */ |
| if (counters[i] && global_id) |
| { |
| /* TODO race condition requires us do the following correction. */ |
| if (__gcov_is_gid_insane (counters[i])) |
| counters[i] = global_id; |
| else if (__gcov_is_gid_insane (global_id)) |
| global_id = counters[i]; |
| |
| gcc_assert (counters[i] == global_id); |
| } |
| else if (global_id) |
| counters[i] = global_id; |
| |
| counters[i + 1] += call_count; |
| |
| /* Reset. */ |
| if (__gcov_is_gid_insane (counters[i])) |
| counters[i] = counters[i + 1] = 0; |
| |
| /* Assert that the invariant (global_id == 0) <==> (call_count == 0) |
| holds true after merging. */ |
| if (counters[i] == 0) |
| counters[i+1] = 0; |
| if (counters[i + 1] == 0) |
| counters[i] = 0; |
| } |
| } |
| #endif |
| |
| #ifdef L_gcov_merge_icall_topn |
| /* The profile merging function used for merging indirect call counts |
| This function is given array COUNTERS of N_COUNTERS old counters and it |
| reads the same number of counters from the gcov file. */ |
| |
| void |
| __gcov_merge_icall_topn (gcov_type *counters, unsigned n_counters) |
| { |
| unsigned i, j, k, m; |
| |
| gcc_assert (!(n_counters % GCOV_ICALL_TOPN_NCOUNTS)); |
| for (i = 0; i < n_counters; i += GCOV_ICALL_TOPN_NCOUNTS) |
| { |
| gcov_type *value_array = &counters[i + 1]; |
| unsigned tmp_size = 2 * (GCOV_ICALL_TOPN_NCOUNTS - 1); |
| gcov_type *tmp_array |
| = (gcov_type *) alloca (tmp_size * sizeof (gcov_type)); |
| |
| for (j = 0; j < tmp_size; j++) |
| tmp_array[j] = 0; |
| |
| for (j = 0; j < GCOV_ICALL_TOPN_NCOUNTS - 1; j += 2) |
| { |
| tmp_array[j] = value_array[j]; |
| tmp_array[j + 1] = value_array [j + 1]; |
| } |
| |
| /* Skip the number_of_eviction entry. */ |
| gcov_read_counter (); |
| for (k = 0; k < GCOV_ICALL_TOPN_NCOUNTS - 1; k += 2) |
| { |
| int found = 0; |
| gcov_type global_id = gcov_read_counter (); |
| gcov_type call_count = gcov_read_counter (); |
| for (m = 0; m < j; m += 2) |
| { |
| if (tmp_array[m] == global_id) |
| { |
| found = 1; |
| tmp_array[m + 1] += call_count; |
| break; |
| } |
| } |
| if (!found) |
| { |
| tmp_array[j] = global_id; |
| tmp_array[j + 1] = call_count; |
| j += 2; |
| } |
| } |
| /* Now sort the temp array */ |
| gcov_sort_n_vals (tmp_array, j); |
| |
| /* Now copy back the top half of the temp array */ |
| for (k = 0; k < GCOV_ICALL_TOPN_NCOUNTS - 1; k += 2) |
| { |
| value_array[k] = tmp_array[k]; |
| value_array[k + 1] = tmp_array[k + 1]; |
| } |
| } |
| } |
| #endif |
| |
| |
| #ifdef L_gcov_merge_single |
| /* The profile merging function for choosing the most common value. |
| It is given an array COUNTERS of N_COUNTERS old counters and it |
| reads the same number of counters from the gcov file. The counters |
| are split into 3-tuples where the members of the tuple have |
| meanings: |
| |
| -- the stored candidate on the most common value of the measured entity |
| -- counter |
| -- total number of evaluations of the value */ |
| void |
| __gcov_merge_single (gcov_type *counters, unsigned n_counters) |
| { |
| unsigned i, n_measures; |
| gcov_type value, counter, all; |
| |
| gcc_assert (!(n_counters % 3)); |
| n_measures = n_counters / 3; |
| for (i = 0; i < n_measures; i++, counters += 3) |
| { |
| value = gcov_read_counter (); |
| counter = gcov_read_counter (); |
| all = gcov_read_counter (); |
| |
| if (counters[0] == value) |
| counters[1] += counter; |
| else if (counter > counters[1]) |
| { |
| counters[0] = value; |
| counters[1] = counter - counters[1]; |
| } |
| else |
| counters[1] -= counter; |
| counters[2] += all; |
| } |
| } |
| #endif /* L_gcov_merge_single */ |
| |
| #ifdef L_gcov_merge_delta |
| /* The profile merging function for choosing the most common |
| difference between two consecutive evaluations of the value. It is |
| given an array COUNTERS of N_COUNTERS old counters and it reads the |
| same number of counters from the gcov file. The counters are split |
| into 4-tuples where the members of the tuple have meanings: |
| |
| -- the last value of the measured entity |
| -- the stored candidate on the most common difference |
| -- counter |
| -- total number of evaluations of the value */ |
| void |
| __gcov_merge_delta (gcov_type *counters, unsigned n_counters) |
| { |
| unsigned i, n_measures; |
| gcov_type value, counter, all; |
| |
| gcc_assert (!(n_counters % 4)); |
| n_measures = n_counters / 4; |
| for (i = 0; i < n_measures; i++, counters += 4) |
| { |
| /* last = */ gcov_read_counter (); |
| value = gcov_read_counter (); |
| counter = gcov_read_counter (); |
| all = gcov_read_counter (); |
| |
| if (counters[1] == value) |
| counters[2] += counter; |
| else if (counter > counters[2]) |
| { |
| counters[1] = value; |
| counters[2] = counter - counters[2]; |
| } |
| else |
| counters[2] -= counter; |
| counters[3] += all; |
| } |
| } |
| #endif /* L_gcov_merge_delta */ |
| |
| #ifdef L_gcov_interval_profiler |
| /* If VALUE is in interval <START, START + STEPS - 1>, then increases the |
| corresponding counter in COUNTERS. If the VALUE is above or below |
| the interval, COUNTERS[STEPS] or COUNTERS[STEPS + 1] is increased |
| instead. */ |
| |
| void |
| __gcov_interval_profiler (gcov_type *counters, gcov_type value, |
| int start, unsigned steps) |
| { |
| gcov_type delta = value - start; |
| if (delta < 0) |
| counters[steps + 1]++; |
| else if (delta >= steps) |
| counters[steps]++; |
| else |
| counters[delta]++; |
| } |
| #endif |
| |
| #ifdef L_gcov_pow2_profiler |
| /* If VALUE is a power of two, COUNTERS[1] is incremented. Otherwise |
| COUNTERS[0] is incremented. */ |
| |
| void |
| __gcov_pow2_profiler (gcov_type *counters, gcov_type value) |
| { |
| if (value & (value - 1)) |
| counters[0]++; |
| else |
| counters[1]++; |
| } |
| #endif |
| |
| /* Tries to determine the most common value among its inputs. Checks if the |
| value stored in COUNTERS[0] matches VALUE. If this is the case, COUNTERS[1] |
| is incremented. If this is not the case and COUNTERS[1] is not zero, |
| COUNTERS[1] is decremented. Otherwise COUNTERS[1] is set to one and |
| VALUE is stored to COUNTERS[0]. This algorithm guarantees that if this |
| function is called more than 50% of the time with one value, this value |
| will be in COUNTERS[0] in the end. |
| |
| In any case, COUNTERS[2] is incremented. */ |
| |
| static inline void |
| __gcov_one_value_profiler_body (gcov_type *counters, gcov_type value) |
| { |
| if (value == counters[0]) |
| counters[1]++; |
| else if (counters[1] == 0) |
| { |
| counters[1] = 1; |
| counters[0] = value; |
| } |
| else |
| counters[1]--; |
| counters[2]++; |
| } |
| |
| /* Atomic update version of __gcov_one_value_profile_body(). */ |
| static inline void |
| __gcov_one_value_profiler_body_atomic (gcov_type *counters, gcov_type value) |
| { |
| if (value == counters[0]) |
| GCOV_TYPE_ATOMIC_FETCH_ADD_FN (&counters[1], 1, MEMMODEL_RELAXED); |
| else if (counters[1] == 0) |
| { |
| counters[1] = 1; |
| counters[0] = value; |
| } |
| else |
| GCOV_TYPE_ATOMIC_FETCH_ADD_FN (&counters[1], -1, MEMMODEL_RELAXED); |
| GCOV_TYPE_ATOMIC_FETCH_ADD_FN (&counters[2], 1, MEMMODEL_RELAXED); |
| } |
| |
| #ifdef L_gcov_indirect_call_topn_profiler |
| /* Tries to keep track the most frequent N values in the counters where |
| N is specified by parameter TOPN_VAL. To track top N values, 2*N counter |
| entries are used. |
| counter[0] --- the accumative count of the number of times one entry in |
| in the counters gets evicted/replaced due to limited capacity. |
| When this value reaches a threshold, the bottom N values are |
| cleared. |
| counter[1] through counter[2*N] records the top 2*N values collected so far. |
| Each value is represented by two entries: count[2*i+1] is the ith value, and |
| count[2*i+2] is the number of times the value is seen. */ |
| |
| static void |
| __gcov_topn_value_profiler_body (gcov_type *counters, gcov_type value, |
| gcov_unsigned_t topn_val) |
| { |
| unsigned i, found = 0, have_zero_count = 0; |
| |
| gcov_type *entry; |
| gcov_type *lfu_entry = &counters[1]; |
| gcov_type *value_array = &counters[1]; |
| gcov_type *num_eviction = &counters[0]; |
| |
| /* There are 2*topn_val values tracked, each value takes two slots in the |
| counter array */ |
| for ( i = 0; i < (topn_val << 2); i += 2) |
| { |
| entry = &value_array[i]; |
| if ( entry[0] == value) |
| { |
| entry[1]++ ; |
| found = 1; |
| break; |
| } |
| else if (entry[1] == 0) |
| { |
| lfu_entry = entry; |
| have_zero_count = 1; |
| } |
| else if (entry[1] < lfu_entry[1]) |
| lfu_entry = entry; |
| } |
| |
| if (found) |
| return; |
| |
| /* lfu_entry is either an empty entry or an entry |
| with lowest count, which will be evicted. */ |
| lfu_entry[0] = value; |
| lfu_entry[1] = 1; |
| |
| #define GCOV_ICALL_COUNTER_CLEAR_THRESHOLD 3000 |
| |
| /* Too many evictions -- time to clear bottom entries to |
| avoid hot values bumping each other out. */ |
| if ( !have_zero_count |
| && ++*num_eviction >= GCOV_ICALL_COUNTER_CLEAR_THRESHOLD) |
| { |
| unsigned i, j; |
| gcov_type *p, minv; |
| gcov_type* tmp_cnts |
| = (gcov_type *)alloca (topn_val * sizeof(gcov_type)); |
| |
| *num_eviction = 0; |
| |
| for ( i = 0; i < topn_val; i++ ) |
| tmp_cnts[i] = 0; |
| |
| /* Find the largest topn_val values from the group of |
| 2*topn_val values and put them into tmp_cnts. */ |
| |
| for ( i = 0; i < 2 * topn_val; i += 2 ) |
| { |
| p = 0; |
| for ( j = 0; j < topn_val; j++ ) |
| { |
| if ( !p || tmp_cnts[j] < *p ) |
| p = &tmp_cnts[j]; |
| } |
| if ( value_array[i + 1] > *p ) |
| *p = value_array[i + 1]; |
| } |
| |
| minv = tmp_cnts[0]; |
| for ( j = 1; j < topn_val; j++ ) |
| { |
| if (tmp_cnts[j] < minv) |
| minv = tmp_cnts[j]; |
| } |
| /* Zero out low value entries */ |
| for ( i = 0; i < 2 * topn_val; i += 2 ) |
| { |
| if (value_array[i + 1] < minv) |
| { |
| value_array[i] = 0; |
| value_array[i + 1] = 0; |
| } |
| } |
| } |
| } |
| #endif |
| |
| #ifdef L_gcov_one_value_profiler |
| void |
| __gcov_one_value_profiler (gcov_type *counters, gcov_type value) |
| { |
| __gcov_one_value_profiler_body (counters, value); |
| } |
| |
| void |
| __gcov_one_value_profiler_atomic (gcov_type *counters, gcov_type value) |
| { |
| __gcov_one_value_profiler_body_atomic (counters, value); |
| } |
| |
| #endif |
| |
| #ifdef L_gcov_indirect_call_profiler |
| |
| /* By default, the C++ compiler will use function addresses in the |
| vtable entries. Setting TARGET_VTABLE_USES_DESCRIPTORS to nonzero |
| tells the compiler to use function descriptors instead. The value |
| of this macro says how many words wide the descriptor is (normally 2), |
| but it may be dependent on target flags. Since we do not have access |
| to the target flags here we just check to see if it is set and use |
| that to set VTABLE_USES_DESCRIPTORS to 0 or 1. |
| |
| It is assumed that the address of a function descriptor may be treated |
| as a pointer to a function. */ |
| |
| #ifdef TARGET_VTABLE_USES_DESCRIPTORS |
| #define VTABLE_USES_DESCRIPTORS 1 |
| #else |
| #define VTABLE_USES_DESCRIPTORS 0 |
| #endif |
| |
| /* Tries to determine the most common value among its inputs. */ |
| void |
| __gcov_indirect_call_profiler (gcov_type* counter, gcov_type value, |
| void* cur_func, void* callee_func) |
| { |
| /* If the C++ virtual tables contain function descriptors then one |
| function may have multiple descriptors and we need to dereference |
| the descriptors to see if they point to the same function. */ |
| if (cur_func == callee_func |
| || (VTABLE_USES_DESCRIPTORS && callee_func |
| && *(void **) cur_func == *(void **) callee_func)) |
| __gcov_one_value_profiler_body (counter, value); |
| } |
| |
| /* Atomic update version of __gcov_indirect_call_profiler(). */ |
| void |
| __gcov_indirect_call_profiler_atomic (gcov_type* counter, gcov_type value, |
| void* cur_func, void* callee_func) |
| { |
| if (cur_func == callee_func |
| || (VTABLE_USES_DESCRIPTORS && callee_func |
| && *(void **) cur_func == *(void **) callee_func)) |
| __gcov_one_value_profiler_body_atomic (counter, value); |
| } |
| #endif |
| |
| |
| #ifdef L_gcov_indirect_call_topn_profiler |
| extern THREAD_PREFIX gcov_type *__gcov_indirect_call_topn_counters ATTRIBUTE_HIDDEN; |
| extern THREAD_PREFIX void *__gcov_indirect_call_topn_callee ATTRIBUTE_HIDDEN; |
| #ifdef TARGET_VTABLE_USES_DESCRIPTORS |
| #define VTABLE_USES_DESCRIPTORS 1 |
| #else |
| #define VTABLE_USES_DESCRIPTORS 0 |
| #endif |
| void |
| __gcov_indirect_call_topn_profiler (void *cur_func, |
| void *cur_module_gcov_info, |
| gcov_unsigned_t cur_func_id) |
| { |
| void *callee_func = __gcov_indirect_call_topn_callee; |
| gcov_type *counter = __gcov_indirect_call_topn_counters; |
| /* If the C++ virtual tables contain function descriptors then one |
| function may have multiple descriptors and we need to dereference |
| the descriptors to see if they point to the same function. */ |
| if (cur_func == callee_func |
| || (VTABLE_USES_DESCRIPTORS && callee_func |
| && *(void **) cur_func == *(void **) callee_func)) |
| { |
| gcov_type global_id |
| = ((struct gcov_info *) cur_module_gcov_info)->mod_info->ident; |
| global_id = GEN_FUNC_GLOBAL_ID (global_id, cur_func_id); |
| __gcov_topn_value_profiler_body (counter, global_id, GCOV_ICALL_TOPN_VAL); |
| __gcov_indirect_call_topn_callee = 0; |
| } |
| } |
| |
| #endif |
| |
| #ifdef L_gcov_direct_call_profiler |
| extern THREAD_PREFIX gcov_type *__gcov_direct_call_counters ATTRIBUTE_HIDDEN; |
| extern THREAD_PREFIX void *__gcov_direct_call_callee ATTRIBUTE_HIDDEN; |
| /* Direct call profiler. */ |
| void |
| __gcov_direct_call_profiler (void *cur_func, |
| void *cur_module_gcov_info, |
| gcov_unsigned_t cur_func_id) |
| { |
| if (cur_func == __gcov_direct_call_callee) |
| { |
| gcov_type global_id |
| = ((struct gcov_info *) cur_module_gcov_info)->mod_info->ident; |
| global_id = GEN_FUNC_GLOBAL_ID (global_id, cur_func_id); |
| __gcov_direct_call_counters[0] = global_id; |
| __gcov_direct_call_counters[1]++; |
| __gcov_direct_call_callee = 0; |
| } |
| } |
| #endif |
| |
| |
| #ifdef L_gcov_average_profiler |
| /* Increase corresponding COUNTER by VALUE. FIXME: Perhaps we want |
| to saturate up. */ |
| |
| void |
| __gcov_average_profiler (gcov_type *counters, gcov_type value) |
| { |
| counters[0] += value; |
| counters[1] ++; |
| } |
| #endif |
| |
| #ifdef L_gcov_ior_profiler |
| /* Bitwise-OR VALUE into COUNTER. */ |
| |
| void |
| __gcov_ior_profiler (gcov_type *counters, gcov_type value) |
| { |
| *counters |= value; |
| } |
| #endif |
| |
| #ifdef L_gcov_fork |
| /* A wrapper for the fork function. Flushes the accumulated profiling data, so |
| that they are not counted twice. */ |
| |
| pid_t |
| __gcov_fork (void) |
| { |
| pid_t pid; |
| extern __gthread_mutex_t __gcov_flush_mx; |
| __gcov_flush (); |
| pid = fork (); |
| if (pid == 0) |
| __GTHREAD_MUTEX_INIT_FUNCTION (&__gcov_flush_mx); |
| return pid; |
| } |
| #endif |
| |
| #ifdef L_gcov_execl |
| /* A wrapper for the execl function. Flushes the accumulated profiling data, so |
| that they are not lost. */ |
| |
| int |
| __gcov_execl (const char *path, char *arg, ...) |
| { |
| va_list ap, aq; |
| unsigned i, length; |
| char **args; |
| |
| __gcov_flush (); |
| |
| va_start (ap, arg); |
| va_copy (aq, ap); |
| |
| length = 2; |
| while (va_arg (ap, char *)) |
| length++; |
| va_end (ap); |
| |
| args = (char **) alloca (length * sizeof (void *)); |
| args[0] = arg; |
| for (i = 1; i < length; i++) |
| args[i] = va_arg (aq, char *); |
| va_end (aq); |
| |
| return execv (path, args); |
| } |
| #endif |
| |
| #ifdef L_gcov_execlp |
| /* A wrapper for the execlp function. Flushes the accumulated profiling data, so |
| that they are not lost. */ |
| |
| int |
| __gcov_execlp (const char *path, char *arg, ...) |
| { |
| va_list ap, aq; |
| unsigned i, length; |
| char **args; |
| |
| __gcov_flush (); |
| |
| va_start (ap, arg); |
| va_copy (aq, ap); |
| |
| length = 2; |
| while (va_arg (ap, char *)) |
| length++; |
| va_end (ap); |
| |
| args = (char **) alloca (length * sizeof (void *)); |
| args[0] = arg; |
| for (i = 1; i < length; i++) |
| args[i] = va_arg (aq, char *); |
| va_end (aq); |
| |
| return execvp (path, args); |
| } |
| #endif |
| |
| #ifdef L_gcov_execle |
| /* A wrapper for the execle function. Flushes the accumulated profiling data, so |
| that they are not lost. */ |
| |
| int |
| __gcov_execle (const char *path, char *arg, ...) |
| { |
| va_list ap, aq; |
| unsigned i, length; |
| char **args; |
| char **envp; |
| |
| __gcov_flush (); |
| |
| va_start (ap, arg); |
| va_copy (aq, ap); |
| |
| length = 2; |
| while (va_arg (ap, char *)) |
| length++; |
| va_end (ap); |
| |
| args = (char **) alloca (length * sizeof (void *)); |
| args[0] = arg; |
| for (i = 1; i < length; i++) |
| args[i] = va_arg (aq, char *); |
| envp = va_arg (aq, char **); |
| va_end (aq); |
| |
| return execve (path, args, envp); |
| } |
| #endif |
| |
| #ifdef L_gcov_execv |
| /* A wrapper for the execv function. Flushes the accumulated profiling data, so |
| that they are not lost. */ |
| |
| int |
| __gcov_execv (const char *path, char *const argv[]) |
| { |
| __gcov_flush (); |
| return execv (path, argv); |
| } |
| #endif |
| |
| #ifdef L_gcov_execvp |
| /* A wrapper for the execvp function. Flushes the accumulated profiling data, so |
| that they are not lost. */ |
| |
| int |
| __gcov_execvp (const char *path, char *const argv[]) |
| { |
| __gcov_flush (); |
| return execvp (path, argv); |
| } |
| #endif |
| |
| #ifdef L_gcov_execve |
| /* A wrapper for the execve function. Flushes the accumulated profiling data, so |
| that they are not lost. */ |
| |
| int |
| __gcov_execve (const char *path, char *const argv[], char *const envp[]) |
| { |
| __gcov_flush (); |
| return execve (path, argv, envp); |
| } |
| #endif |
| |
| #endif /* inhibit_libc */ |