diff options
author | Jing Yu <jingyu@google.com> | 2012-04-24 14:08:37 -0700 |
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committer | Jing Yu <jingyu@google.com> | 2012-04-24 14:08:37 -0700 |
commit | 21b2cba584638ed5ffad8e3fd3e6808bfa299cf0 (patch) | |
tree | 013ab0feaf2ca62b0667ceff9b488ae61bd54584 /lib/gcc/arm-eabi/4.6.x-google/gcov-src/libgcov.c | |
parent | a1833f5102e79a38f44cbf2cc924521957356e7c (diff) | |
download | arm-eabi-4.6-eb0f8932ad3086cc6605d69680bd5e5477d723b7.tar.gz |
Commit 64bit darwin hosted arm-eabi toolchain for kernel use.android-sdk-support_r11android-sdk-4.4.2_r1.0.1android-sdk-4.4.2_r1android-cts-4.4_r4android-cts-4.4_r1android-cts-4.2_r2android-cts-4.2_r1android-4.4w_r1android-4.4_r1.2.0.1android-4.4_r1.2android-4.4_r1.1.0.1android-4.4_r1.1android-4.4_r1.0.1android-4.4_r1android-4.4_r0.9android-4.4_r0.8android-4.4_r0.7android-4.4.4_r2.0.1android-4.4.4_r2android-4.4.4_r1.0.1android-4.4.4_r1android-4.4.3_r1.1.0.1android-4.4.3_r1.1android-4.4.3_r1.0.1android-4.4.3_r1android-4.4.2_r2.0.1android-4.4.2_r2android-4.4.2_r1.0.1android-4.4.2_r1android-4.4.1_r1.0.1android-4.4.1_r1android-4.3_r3.1android-4.3_r3android-4.3_r2.3android-4.3_r2.2android-4.3_r2.1android-4.3_r2android-4.3_r1.1android-4.3_r1android-4.3_r0.9.1android-4.3_r0.9android-4.3.1_r1android-4.2_r1android-4.2.2_r1.2android-4.2.2_r1.1android-4.2.2_r1android-4.2.1_r1.2android-4.2.1_r1.1android-4.2.1_r1tools_r22.2tools_r22tools_r21l-previewkitkat-wearkitkat-releasekitkat-mr2.2-releasekitkat-mr2.1-releasekitkat-mr2-releasekitkat-mr1.1-releasekitkat-mr1-releasekitkat-devkitkat-cts-releasekitkat-cts-devjb-mr2.0.0-releasejb-mr2.0-releasejb-mr2-releasejb-mr2-devjb-mr1.1-releasejb-mr1.1-dev-plus-aospjb-mr1.1-devjb-mr1-releasejb-mr1-dev-plus-aospjb-mr1-devidea133-weekly-releaseidea133
Change-Id: I3783abf0005a74789942728a4cd63a1194b32daa
Diffstat (limited to 'lib/gcc/arm-eabi/4.6.x-google/gcov-src/libgcov.c')
-rw-r--r-- | lib/gcc/arm-eabi/4.6.x-google/gcov-src/libgcov.c | 1989 |
1 files changed, 1989 insertions, 0 deletions
diff --git a/lib/gcc/arm-eabi/4.6.x-google/gcov-src/libgcov.c b/lib/gcc/arm-eabi/4.6.x-google/gcov-src/libgcov.c new file mode 100644 index 0000000..613c1f4 --- /dev/null +++ b/lib/gcc/arm-eabi/4.6.x-google/gcov-src/libgcov.c @@ -0,0 +1,1989 @@ +/* Routines required for instrumenting a program. */ +/* Compile this one with gcc. */ +/* Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, + 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2010 + 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/>. */ + +/* Assume compiling for Linux Kernel if __KERNEL__ is defined. */ +#ifdef __KERNEL__ + /* Define MACROs to be used by kernel compilation. */ +# define L_gcov +# define L_gcov_interval_profiler +# define L_gcov_pow2_profiler +# define L_gcov_one_value_profiler +# define L_gcov_indirect_call_profiler +# define L_gcov_average_profiler +# define L_gcov_ior_profiler + +# define HAVE_CC_TLS 0 +# define __GCOV_KERNEL__ + +# define IN_LIBGCOV 1 +# define IN_GCOV 0 +#else /* __KERNEL__ */ +#include "tconfig.h" +#include "tsystem.h" +#include "coretypes.h" +#include "tm.h" +#endif /* __KERNEL__ */ + +#if 1 +#define THREAD_PREFIX __thread +#else +#define THREAD_PREFIX +#endif + +#ifndef __GCOV_KERNEL__ +#if defined(inhibit_libc) +#define IN_LIBGCOV (-1) +#else +#undef NULL /* Avoid errors if stdio.h and our stddef.h mismatch. */ +#include <stdio.h> +#define IN_LIBGCOV 1 +#if defined(L_gcov) +#define GCOV_LINKAGE /* nothing */ +#endif +#endif +#endif /* __GCOV_KERNEL__ */ + +#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_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 + +#ifndef __GCOV_KERNEL__ +#include <string.h> +#if GCOV_LOCKED +#include <fcntl.h> +#include <errno.h> +#include <sys/stat.h> +#endif +#endif /* __GCOV_KERNEL__ */ + +#ifdef L_gcov +#include "gcov-io.c" + +/* Utility function for outputing errors. */ +static int +gcov_error (const char *fmt, ...) +{ + int ret; + va_list argp; + va_start (argp, fmt); +#ifdef __GCOV_KERNEL__ + ret = vprintk (fmt, argp); +#else + ret = vfprintf (stderr, fmt, argp); +#endif + va_end (argp); + return ret; +} + +#ifndef __GCOV_KERNEL__ +/* Emitted in coverage.c. */ +extern char * __gcov_pmu_profile_filename; +extern char * __gcov_pmu_profile_options; +extern gcov_unsigned_t __gcov_pmu_top_n_address; + +/* Sampling rate. */ +extern gcov_unsigned_t __gcov_sampling_rate; +static int gcov_sampling_rate_initialized = 0; +void __gcov_set_sampling_rate (unsigned int rate); + +/* Set sampling rate to RATE. */ + +void __gcov_set_sampling_rate (unsigned int rate) +{ + __gcov_sampling_rate = rate; +} + +/* Per thread sample counter. */ +THREAD_PREFIX gcov_unsigned_t __gcov_sample_counter = 0; + +/* Chain of per-object gcov structures. */ +extern struct gcov_info *__gcov_list; + +/* Size of the longest file name. */ +static size_t gcov_max_filename = 0; +#endif /* __GCOV_KERNEL__ */ + +/* 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; + +/* A program checksum allows us to distinguish program data for an + object file included in multiple programs. */ +static gcov_unsigned_t gcov_crc32; + +/* 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; + +/* Profile summary for this object in current execuction. */ +static struct gcov_summary this_object; + +/* Merged profile summary for this program. */ +static struct gcov_summary program; + +/* Merged profile summary for this object. */ +static struct gcov_summary object; + +/* 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); + +/* 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 (1 << type) & info->ctr_mask; +} + +#ifndef __GCOV_KERNEL__ +/* 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 + +/* 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. */ + 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; +} + +/* Stop the pmu profiler and dump pmu profile info into the global file. */ + +static void +pmu_profile_stop (void) +{ + const char *pmu_profile_filename = __gcov_pmu_profile_filename; + const char *pmu_options = __gcov_pmu_profile_options; + size_t filename_length; + int gcda_error; + + if (!pmu_profile_filename || !pmu_options) + return; + + __gcov_stop_pmu_profiler (); + + filename_length = strlen (pmu_profile_filename); + if (filename_length > gcov_max_filename) + gcov_max_filename = filename_length; + /* Allocate and initialize the filename scratch space. */ + gcov_alloc_filename (); + GCOV_GET_FILENAME (prefix_length, gcov_prefix_strip, pmu_profile_filename, + gi_filename_up); + /* Open the gcda file for writing. We don't support merge yet. */ + gcda_error = gcov_open_by_filename (gi_filename); + __gcov_end_pmu_profiler (gcda_error); + if ((gcda_error = gcov_close ())) + gcov_error (gcda_error < 0 ? "pmu_profile_stop:%s:Overflow writing\n" : + "pmu_profile_stop:%s:Error writing\n", + gi_filename); +} + +/* 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); + 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. */ + +static void +gcov_exit (void) +{ + struct gcov_info *gi_ptr; + int dump_module_info; + + /* Stop and write the PMU profile data into the global file. */ + pmu_profile_stop (); + + 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); +} + +/* 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_rate_initialized) + { + const char* env_value_str = getenv ("GCOV_SAMPLING_RATE"); + if (env_value_str) + { + int env_value_int = atoi(env_value_str); + if (env_value_int >= 1) + __gcov_sampling_rate = env_value_int; + } + gcov_sampling_rate_initialized = 1; + } + + if (!info->version) + return; + + if (gcov_version (info, info->version, 0)) + { + const char *ptr = info->filename; + gcov_unsigned_t crc32 = gcov_crc32; + size_t filename_length = strlen (info->filename); + struct gcov_pmu_info pmu_info; + + /* Refresh the longest file name information. */ + if (filename_length > gcov_max_filename) + gcov_max_filename = filename_length; + + /* Initialize the pmu profiler. */ + pmu_info.pmu_profile_filename = __gcov_pmu_profile_filename; + pmu_info.pmu_tool = __gcov_pmu_profile_options; + pmu_info.pmu_top_n_address = __gcov_pmu_top_n_address; + __gcov_init_pmu_profiler (&pmu_info); + if (pmu_info.pmu_profile_filename) + { + /* Refresh the longest file name information. */ + filename_length = strlen (pmu_info.pmu_profile_filename); + 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); + + do + { + unsigned ix; + gcov_unsigned_t value = *ptr << 24; + + for (ix = 8; ix--; value <<= 1) + { + gcov_unsigned_t feedback; + + feedback = (value ^ crc32) & 0x80000000 ? 0x04c11db7 : 0; + crc32 <<= 1; + crc32 ^= feedback; + } + } while (*ptr++); + + gcov_crc32 = crc32; + + if (!__gcov_list) + { + atexit (gcov_exit); + /* Start pmu profiler. */ + __gcov_start_pmu_profiler (); + } + + info->next = __gcov_list; + __gcov_list = info; + } + info->version = 0; +} + +/* 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) +{ + const struct gcov_info *gi_ptr; + + __gcov_stop_pmu_profiler (); + gcov_exit (); + for (gi_ptr = __gcov_list; gi_ptr; gi_ptr = gi_ptr->next) + { + unsigned t_ix; + const struct gcov_ctr_info *ci_ptr; + + for (t_ix = 0, ci_ptr = gi_ptr->counts; t_ix != GCOV_COUNTERS; t_ix++) + if (gcov_counter_active (gi_ptr, t_ix)) + { + memset (ci_ptr->values, 0, sizeof (gcov_type) * ci_ptr->num); + ci_ptr++; + } + } + __gcov_start_pmu_profiler (); +} + +#else /* __GCOV_KERNEL__ */ + +#define GCOV_GET_FILENAME gcov_get_filename + +/* Copy the filename to the buffer. */ + +static inline void +gcov_get_filename (int prefix_length __attribute__ ((unused)), + int gcov_prefix_strip __attribute__ ((unused)), + const char *filename, char *gi_filename_up) +{ + strcpy (gi_filename_up, filename); +} + +/* 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) +{ + /* Empty */ +} + +/* Reserves a buffer to store the name of the file being processed. */ +static char _kernel_gi_filename[520]; + +/* This function allocates the space to store current file name. */ + +static void +gcov_alloc_filename (void) +{ + prefix_length = 0; + gcov_prefix_strip = 0; + gi_filename = _kernel_gi_filename; + gi_filename_up = _kernel_gi_filename; +} + +#endif /* __GCOV_KERNEL__ */ + +/* Determine number of active counters in gcov_info INFO, + the counter arrays are stored in VALUES if the coming + value of VALUES !=0. If FLAG_SORT_ICALL_TOPN_COUNTER !=0, + the icall_topn_counter in INFO will be sorted. + Return: the number of active counter types. */ + +static unsigned int +gcov_counter_array (const struct gcov_info *info, + gcov_type *values[GCOV_COUNTERS], + int flag_sort_icall_topn_counter) +{ + unsigned int i; + unsigned int result = 0; + + for (i = 0; i < GCOV_COUNTERS; i++) { + if (gcov_counter_active (info, i)) + { + if (values) + values[result] = info->counts[result].values; + if (flag_sort_icall_topn_counter && + (i == GCOV_COUNTER_ICALL_TOPNV)) + gcov_sort_icall_topn_counter (&info->counts[result]); + result++; + } + } + return result; +} + +/* 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_ctr_info *ci_ptr; + struct gcov_ctr_summary *cs_ptr; + gcov_unsigned_t c_num; + unsigned t_ix; + + /* Totals for this object file. */ + ci_ptr = info->counts; + for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++) + { + if (!gcov_counter_active (info, t_ix)) + continue; + + cs_ptr = &(obj_sum->ctrs[t_ix]); + cs_ptr->num += 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++; + } +} + +/* 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 *info, + gcov_type *values[GCOV_COUNTERS], + unsigned fi_stride) +{ + struct gcov_ctr_summary *cs_obj, *cs_tobj, *cs_prg, *cs_tprg, *cs_all; + unsigned t_ix, f_ix; + +#ifndef __GCOV_KERNEL__ + const struct gcov_fn_info *fi_ptr; + unsigned c_ix, n_counts; + int error = 0; + gcov_unsigned_t tag, length; + + eof_pos = 0; + summary_pos = 0; + + 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; + } + length = gcov_read_unsigned (); + if (!gcov_version (info, length, gi_filename)) + goto read_fatal; + + length = gcov_read_unsigned (); + if (length != info->stamp) + /* Read from a different compilation. Overwrite the file. */ + goto rewrite; + + /* Merge execution counts for each function. */ + for (f_ix = 0; f_ix < info->n_functions; f_ix++) + { + fi_ptr = (const struct gcov_fn_info *) + ((const char *) info->functions + f_ix * fi_stride); + tag = gcov_read_unsigned (); + length = gcov_read_unsigned (); + + /* Check function. */ + if (tag != GCOV_TAG_FUNCTION + || length != GCOV_TAG_FUNCTION_LENGTH + || gcov_read_unsigned () != fi_ptr->ident + || gcov_read_unsigned () != fi_ptr->lineno_checksum + || gcov_read_unsigned () != fi_ptr->cfg_checksum) + goto read_mismatch; + + c_ix = 0; + for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++) + { + gcov_merge_fn merge; + + if (!((1 << t_ix) & info->ctr_mask)) + continue; + + n_counts = fi_ptr->n_ctrs[c_ix]; + merge = info->counts[c_ix].merge; + + tag = gcov_read_unsigned (); + length = gcov_read_unsigned (); + if (tag != GCOV_TAG_FOR_COUNTER (t_ix) + || length != GCOV_TAG_COUNTER_LENGTH (n_counts)) + goto read_mismatch; + (*merge) (values[c_ix], n_counts); + values[c_ix] += n_counts; + c_ix++; + } + if ((error = gcov_is_error ())) + goto read_error; + } + + f_ix = ~0u; + /* Check program & object summary. */ + while (1) + { + int is_program; + + eof_pos = gcov_position (); + tag = gcov_read_unsigned (); + if (!tag) + break; + + length = gcov_read_unsigned (); + is_program = tag == GCOV_TAG_PROGRAM_SUMMARY; + if (length != GCOV_TAG_SUMMARY_LENGTH + || (!is_program && tag != GCOV_TAG_OBJECT_SUMMARY)) + goto read_mismatch; + gcov_read_summary (is_program ? &program : &object); + if ((error = gcov_is_error ())) + goto read_error; + if (is_program && program.checksum == gcov_crc32) + { + summary_pos = eof_pos; + goto rewrite; + } + } + } + + goto rewrite; + +read_error:; + gcov_error (error < 0 ? "profiling:%s:Overflow merging\n" + : "profiling:%s:Error merging\n", gi_filename); + goto read_fatal; + +#endif /* __GCOV_KERNEL__ */ + + goto rewrite; + +read_mismatch:; + gcov_error ("profiling:%s:Merge mismatch for %s\n", gi_filename, + f_ix + 1 ? "function" : "summaries"); + goto read_fatal; /* work-around the compiler warning */ + +read_fatal:; + gcov_close (); + return 1; + +rewrite:; + gcov_rewrite (); + if (!summary_pos) + memset (&program, 0, sizeof (program)); + + /* Merge the summaries. */ + f_ix = ~0u; + for (t_ix = 0; t_ix < GCOV_COUNTERS_SUMMABLE; t_ix++) + { + cs_obj = &object.ctrs[t_ix]; + cs_tobj = &this_object.ctrs[t_ix]; + cs_prg = &program.ctrs[t_ix]; + cs_tprg = &this_program.ctrs[t_ix]; + cs_all = &all.ctrs[t_ix]; + + if ((1 << t_ix) & info->ctr_mask) + { + if (!cs_obj->runs++) + cs_obj->num = cs_tobj->num; + else if (cs_obj->num != cs_tobj->num) + goto read_mismatch; + cs_obj->sum_all += cs_tobj->sum_all; + if (cs_obj->run_max < cs_tobj->run_max) + cs_obj->run_max = cs_tobj->run_max; + cs_obj->sum_max += cs_tobj->run_max; + + if (!cs_prg->runs++) + cs_prg->num = cs_tprg->num; + else if (cs_prg->num != cs_tprg->num) + goto read_mismatch; + 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; + } + else if (cs_obj->num || cs_prg->num) + 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) + && memcmp (cs_all, cs_prg, sizeof (*cs_all))) + { + gcov_error ("profiling:%s:Invocation mismatch - " + "some data files may have been removed%s", + gi_filename, GCOV_LOCKED + ? "" : " or concurrent update without locking support"); + all.checksum = ~0u; + } + } + + return 0; +} + +/* Calculate the function_info stride. This depends on the + number of counter types being measured. + NUM_COUNTER_TYPES is number of counter types recorded. + Return: the number of bytes for accessing next fn_info + (aligned to gcov_fn_info). */ + +static unsigned +gcov_compute_fi_stride (unsigned num_counter_types) +{ + unsigned fi_stride; + + fi_stride = offsetof (struct gcov_fn_info, n_ctrs) + + num_counter_types * sizeof (unsigned); + if (__alignof__ (struct gcov_fn_info) > sizeof (unsigned)) + { + fi_stride += __alignof__ (struct gcov_fn_info) - 1; + fi_stride &= ~(__alignof__ (struct gcov_fn_info) - 1); + } + return fi_stride; +} + +/* 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, c_ix; + unsigned n_counts; + unsigned fi_stride; + gcov_type *values[GCOV_COUNTERS]; + + c_ix = gcov_counter_array (gi_ptr, values, 0); + fi_stride = gcov_compute_fi_stride (c_ix); + + /* GCOV_DATA_MAGIC, GCOV_VERSION and time_stamp. */ + size = 3; + + /* size for each function. */ + for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++) + { + fi_ptr = (const struct gcov_fn_info *) + ((const char *) gi_ptr->functions + f_ix * fi_stride); + + size += 2 /* tag_length itself */ + + GCOV_TAG_FUNCTION_LENGTH; /* ident, lineno_cksum, cfg_cksm */ + + c_ix = 0; + for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++) + { + if (!((1 << t_ix) & gi_ptr->ctr_mask)) + continue; + + n_counts = fi_ptr->n_ctrs[c_ix]; + size += 2 + GCOV_TAG_COUNTER_LENGTH (n_counts); + c_ix++; + } + } + + /* Object summary. */ + size += 2 + GCOV_TAG_SUMMARY_LENGTH; + + /* Program summary. */ + size += 2 + GCOV_TAG_SUMMARY_LENGTH; + + 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, + unsigned fi_stride) +{ + const struct gcov_fn_info *fi_ptr; + gcov_type *values[GCOV_COUNTERS]; + unsigned t_ix, c_ix, f_ix, n_counts; + int error = 0; + + /* Write out the data. */ + gcov_write_tag_length (GCOV_DATA_MAGIC, GCOV_VERSION); + gcov_write_unsigned (gi_ptr->stamp); + + gcov_counter_array (gi_ptr, values, 0); + + /* Write execution counts for each function. */ + for (f_ix = 0; f_ix < gi_ptr->n_functions; f_ix++) + { + fi_ptr = (const struct gcov_fn_info *) + ((const char *) gi_ptr->functions + f_ix * fi_stride); + + /* Announce function. */ + gcov_write_tag_length (GCOV_TAG_FUNCTION, GCOV_TAG_FUNCTION_LENGTH); + gcov_write_unsigned (fi_ptr->ident); + gcov_write_unsigned (fi_ptr->lineno_checksum); + gcov_write_unsigned (fi_ptr->cfg_checksum); + + c_ix = 0; + for (t_ix = 0; t_ix < GCOV_COUNTERS; t_ix++) + { + gcov_type *c_ptr; + + if (!((1 << t_ix) & gi_ptr->ctr_mask)) + continue; + + n_counts = fi_ptr->n_ctrs[c_ix]; + + gcov_write_tag_length (GCOV_TAG_FOR_COUNTER (t_ix), + GCOV_TAG_COUNTER_LENGTH (n_counts)); + c_ptr = values[c_ix]; + while (n_counts--) + gcov_write_counter (*c_ptr++); + + values[c_ix] = c_ptr; + c_ix++; + } + } + + /* Object file summary. */ + gcov_write_summary (GCOV_TAG_OBJECT_SUMMARY, &object); + + /* Generate whole program statistics. */ + program.checksum = gcov_crc32; + if (eof_pos) + gcov_seek (eof_pos); + gcov_write_summary (GCOV_TAG_PROGRAM_SUMMARY, &program); + if (!summary_pos) + gcov_write_unsigned (0); + + /* TODO: there is a problem here -- if there are other program + summary data after the matching one, setting eof_pos to this + position means that the module info table will overwrite the + those other program summary. It also means a mismatch error + may occur at the next merge if no matching program summary is + found before the module info data. */ + if (!summary_pos) + gi_ptr->eof_pos = gcov_position () - 1; + else + gi_ptr->eof_pos = gcov_position (); + + 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_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) +{ + gcov_type *values[GCOV_COUNTERS]; + unsigned fi_stride; + unsigned c_ix; + int ret; + + memset (&this_object, 0, sizeof (this_object)); + memset (&object, 0, sizeof (object)); + + gcov_object_summary (gi_ptr, &this_object); + + c_ix = gcov_counter_array (gi_ptr, values, 1); + + fi_stride = gcov_compute_fi_stride (c_ix); + + 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, values, fi_stride); + if (ret != 0 ) return; + + gcov_write_gcda_file (gi_ptr, fi_stride); +} + +#endif /* L_gcov */ + +#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_reusedist + +/* Return the weighted arithmetic mean of two values. */ + +static gcov_type +__gcov_weighted_mean2 (gcov_type value1, gcov_type count1, + gcov_type value2, gcov_type count2) +{ + if (count1 + count2 == 0) + return 0; + else + return (value1 * count1 + value2 * count2) / (count1 + count2); +} + +void +__gcov_merge_reusedist (gcov_type *counters, unsigned n_counters) +{ + unsigned i; + + gcc_assert(!(n_counters % 4)); + + for (i = 0; i < n_counters; i += 4) + { + /* Decode current values. */ + gcov_type c_mean_dist = counters[i]; + gcov_type c_mean_size = counters[i+1]; + gcov_type c_count = counters[i+2]; + gcov_type c_dist_x_size = counters[i+3]; + + /* Read and decode values in file. */ + gcov_type f_mean_dist = __gcov_read_counter (); + gcov_type f_mean_size = __gcov_read_counter (); + gcov_type f_count = __gcov_read_counter (); + gcov_type f_dist_x_size = __gcov_read_counter (); + + /* Compute aggregates. */ + gcov_type a_mean_dist = __gcov_weighted_mean2 ( + f_mean_dist, f_count, c_mean_dist, c_count); + gcov_type a_mean_size = __gcov_weighted_mean2 ( + f_mean_size, f_count, c_mean_size, c_count); + gcov_type a_count = f_count + c_count; + gcov_type a_dist_x_size = f_dist_x_size + c_dist_x_size; + + /* Encode back into counters. */ + counters[i] = a_mean_dist; + counters[i+1] = a_mean_size; + counters[i+2] = a_count; + counters[i+3] = a_dist_x_size; + } +} + +#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]++; +} + +#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); +} +#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); +} +#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 +/* Increase corresponding COUNTER by VALUE. FIXME: Perhaps we want + to saturate up. */ + +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) +{ + __gcov_flush (); + return fork (); +} +#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 + +#ifdef __GCOV_KERNEL__ +/* + * Provide different implementation for the following functions: + * __gcov_init + * __gcov_exit + * + * Provide the following dummy merge functions: + * __gcov_merge_add + * __gcov_merge_single + * __gcov_merge_delta + * __gcov_merge_ior + * __gcov_merge_icall_topn + * __gcov_merge_dc + * __gcov_merge_reusedist + * + * Reuse the following functions: + * __gcov_interval_profiler() + * __gcov_pow2_profiler() + * __gcov_average_profiler() + * __gcov_ior_profiler() + * __gcov_one_value_profiler() + * __gcov_indirect_call_profiler() + * |-> __gcov_one_value_profiler_body() + * + * For LIPO: (TBD) + * Change slightly for the following functions: + * __gcov_merge_icall_topn + * __gcov_merge_dc + * + * Reuse the following functions: + * __gcov_direct_call_profiler() + * __gcov_indirect_call_topn_profiler() + * |-> __gcov_topn_value_profiler_body() + * + */ + +/* Current virual gcda file. This is for kernel use only. */ +gcov_kernel_vfile *gcov_current_file; + +/* Set current virutal gcda file. It needs to be set before dumping + profile data. */ + +void +gcov_set_vfile (gcov_kernel_vfile *file) +{ + gcov_current_file = file; +} + +/* Dump one entry in the gcov_info list (for one object) in kernel. */ + +void +gcov_kernel_dump_one_gcov (struct gcov_info *info) +{ + gcc_assert (gcov_current_file); + + gcov_exit_init (); + + gcov_dump_one_gcov (info); +} + +#define DUMMY_FUNC(func) \ +void func (gcov_type *counters __attribute__ ((unused)), \ + unsigned n_counters __attribute__ ((unused))) {} + +DUMMY_FUNC (__gcov_merge_add) +EXPORT_SYMBOL (__gcov_merge_add); + +DUMMY_FUNC (__gcov_merge_single) +EXPORT_SYMBOL (__gcov_merge_single); + +DUMMY_FUNC (__gcov_merge_delta) +EXPORT_SYMBOL (__gcov_merge_delta); + +DUMMY_FUNC(__gcov_merge_ior) +EXPORT_SYMBOL (__gcov_merge_ior); + +DUMMY_FUNC (__gcov_merge_icall_topn) +EXPORT_SYMBOL (__gcov_merge_icall_topn); + +DUMMY_FUNC (__gcov_merge_dc) +EXPORT_SYMBOL (__gcov_merge_dc); + +DUMMY_FUNC (__gcov_merge_reusedist) +EXPORT_SYMBOL (__gcov_merge_reusedist); + +EXPORT_SYMBOL (__gcov_average_profiler); +EXPORT_SYMBOL (__gcov_indirect_call_profiler); +EXPORT_SYMBOL (__gcov_interval_profiler); +EXPORT_SYMBOL (__gcov_ior_profiler); +EXPORT_SYMBOL (__gcov_one_value_profiler); +EXPORT_SYMBOL (__gcov_pow2_profiler); + +#endif /* __GCOV_KERNEL__ */ + +#endif /* inhibit_libc */ |