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583 lines
15 KiB
583 lines
15 KiB
/*===- GCDAProfiling.c - Support library for GCDA file emission -----------===*\
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|*
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|* The LLVM Compiler Infrastructure
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|*
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|* This file is distributed under the University of Illinois Open Source
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|* License. See LICENSE.TXT for details.
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|*
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|*===----------------------------------------------------------------------===*|
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|*
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|* This file implements the call back routines for the gcov profiling
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|* instrumentation pass. Link against this library when running code through
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|* the -insert-gcov-profiling LLVM pass.
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|*
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|* We emit files in a corrupt version of GCOV's "gcda" file format. These files
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|* are only close enough that LCOV will happily parse them. Anything that lcov
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|* ignores is missing.
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|*
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|* TODO: gcov is multi-process safe by having each exit open the existing file
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|* and append to it. We'd like to achieve that and be thread-safe too.
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|*
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\*===----------------------------------------------------------------------===*/
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#include "InstrProfilingUtil.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined(_WIN32)
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#include "WindowsMMap.h"
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#else
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#include <sys/mman.h>
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#include <sys/file.h>
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#endif
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#if defined(__FreeBSD__) && defined(__i386__)
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#define I386_FREEBSD 1
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#else
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#define I386_FREEBSD 0
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#endif
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#if !defined(_MSC_VER) && !I386_FREEBSD
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#include <stdint.h>
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#endif
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#if defined(_MSC_VER)
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typedef unsigned char uint8_t;
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typedef unsigned int uint32_t;
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typedef unsigned long long uint64_t;
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#elif I386_FREEBSD
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/* System headers define 'size_t' incorrectly on x64 FreeBSD (prior to
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* FreeBSD 10, r232261) when compiled in 32-bit mode.
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*/
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typedef unsigned char uint8_t;
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typedef unsigned int uint32_t;
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typedef unsigned long long uint64_t;
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#endif
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/* #define DEBUG_GCDAPROFILING */
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/*
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* --- GCOV file format I/O primitives ---
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*/
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/*
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* The current file name we're outputting. Used primarily for error logging.
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*/
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static char *filename = NULL;
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/*
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* The current file we're outputting.
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*/
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static FILE *output_file = NULL;
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/*
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* Buffer that we write things into.
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*/
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#define WRITE_BUFFER_SIZE (128 * 1024)
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static char *write_buffer = NULL;
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static uint64_t cur_buffer_size = 0;
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static uint64_t cur_pos = 0;
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static uint64_t file_size = 0;
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static int new_file = 0;
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static int fd = -1;
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/*
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* A list of functions to write out the data.
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*/
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typedef void (*writeout_fn)();
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struct writeout_fn_node {
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writeout_fn fn;
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struct writeout_fn_node *next;
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};
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static struct writeout_fn_node *writeout_fn_head = NULL;
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static struct writeout_fn_node *writeout_fn_tail = NULL;
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/*
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* A list of flush functions that our __gcov_flush() function should call.
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*/
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typedef void (*flush_fn)();
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struct flush_fn_node {
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flush_fn fn;
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struct flush_fn_node *next;
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};
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static struct flush_fn_node *flush_fn_head = NULL;
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static struct flush_fn_node *flush_fn_tail = NULL;
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static void resize_write_buffer(uint64_t size) {
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if (!new_file) return;
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size += cur_pos;
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if (size <= cur_buffer_size) return;
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size = (size - 1) / WRITE_BUFFER_SIZE + 1;
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size *= WRITE_BUFFER_SIZE;
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write_buffer = realloc(write_buffer, size);
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cur_buffer_size = size;
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}
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static void write_bytes(const char *s, size_t len) {
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resize_write_buffer(len);
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memcpy(&write_buffer[cur_pos], s, len);
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cur_pos += len;
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}
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static void write_32bit_value(uint32_t i) {
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write_bytes((char*)&i, 4);
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}
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static void write_64bit_value(uint64_t i) {
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write_bytes((char*)&i, 8);
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}
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static uint32_t length_of_string(const char *s) {
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return (strlen(s) / 4) + 1;
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}
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static void write_string(const char *s) {
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uint32_t len = length_of_string(s);
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write_32bit_value(len);
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write_bytes(s, strlen(s));
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write_bytes("\0\0\0\0", 4 - (strlen(s) % 4));
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}
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static uint32_t read_32bit_value() {
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uint32_t val;
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if (new_file)
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return (uint32_t)-1;
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val = *(uint32_t*)&write_buffer[cur_pos];
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cur_pos += 4;
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return val;
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}
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static uint64_t read_64bit_value() {
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uint64_t val;
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if (new_file)
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return (uint64_t)-1;
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val = *(uint64_t*)&write_buffer[cur_pos];
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cur_pos += 8;
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return val;
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}
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static char *mangle_filename(const char *orig_filename) {
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char *new_filename;
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size_t filename_len, prefix_len;
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int prefix_strip;
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int level = 0;
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const char *fname, *ptr;
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const char *prefix = getenv("GCOV_PREFIX");
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const char *prefix_strip_str = getenv("GCOV_PREFIX_STRIP");
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if (prefix == NULL || prefix[0] == '\0')
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return strdup(orig_filename);
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if (prefix_strip_str) {
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prefix_strip = atoi(prefix_strip_str);
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/* Negative GCOV_PREFIX_STRIP values are ignored */
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if (prefix_strip < 0)
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prefix_strip = 0;
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} else {
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prefix_strip = 0;
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}
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fname = orig_filename;
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for (level = 0, ptr = fname + 1; level < prefix_strip; ++ptr) {
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if (*ptr == '\0')
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break;
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if (*ptr != '/')
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continue;
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fname = ptr;
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++level;
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}
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filename_len = strlen(fname);
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prefix_len = strlen(prefix);
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new_filename = malloc(prefix_len + 1 + filename_len + 1);
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memcpy(new_filename, prefix, prefix_len);
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if (prefix[prefix_len - 1] != '/')
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new_filename[prefix_len++] = '/';
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memcpy(new_filename + prefix_len, fname, filename_len + 1);
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return new_filename;
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}
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static int map_file() {
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fseek(output_file, 0L, SEEK_END);
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file_size = ftell(output_file);
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/* A size of 0 is invalid to `mmap'. Return a fail here, but don't issue an
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* error message because it should "just work" for the user. */
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if (file_size == 0)
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return -1;
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write_buffer = mmap(0, file_size, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_SHARED, fd, 0);
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if (write_buffer == (void *)-1) {
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int errnum = errno;
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fprintf(stderr, "profiling: %s: cannot map: %s\n", filename,
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strerror(errnum));
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return -1;
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}
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return 0;
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}
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static void unmap_file() {
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if (msync(write_buffer, file_size, MS_SYNC) == -1) {
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int errnum = errno;
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fprintf(stderr, "profiling: %s: cannot msync: %s\n", filename,
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strerror(errnum));
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}
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/* We explicitly ignore errors from unmapping because at this point the data
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* is written and we don't care.
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*/
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(void)munmap(write_buffer, file_size);
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write_buffer = NULL;
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file_size = 0;
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}
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/*
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* --- LLVM line counter API ---
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*/
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/* A file in this case is a translation unit. Each .o file built with line
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* profiling enabled will emit to a different file. Only one file may be
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* started at a time.
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*/
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void llvm_gcda_start_file(const char *orig_filename, const char version[4],
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uint32_t checksum) {
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const char *mode = "r+b";
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filename = mangle_filename(orig_filename);
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/* Try just opening the file. */
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new_file = 0;
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fd = open(filename, O_RDWR);
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if (fd == -1) {
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/* Try opening the file, creating it if necessary. */
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new_file = 1;
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mode = "w+b";
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fd = open(filename, O_RDWR | O_CREAT, 0644);
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if (fd == -1) {
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/* Try creating the directories first then opening the file. */
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__llvm_profile_recursive_mkdir(filename);
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fd = open(filename, O_RDWR | O_CREAT, 0644);
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if (fd == -1) {
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/* Bah! It's hopeless. */
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int errnum = errno;
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fprintf(stderr, "profiling: %s: cannot open: %s\n", filename,
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strerror(errnum));
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return;
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}
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}
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}
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/* Try to flock the file to serialize concurrent processes writing out to the
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* same GCDA. This can fail if the filesystem doesn't support it, but in that
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* case we'll just carry on with the old racy behaviour and hope for the best.
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*/
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flock(fd, LOCK_EX);
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output_file = fdopen(fd, mode);
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/* Initialize the write buffer. */
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write_buffer = NULL;
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cur_buffer_size = 0;
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cur_pos = 0;
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if (new_file) {
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resize_write_buffer(WRITE_BUFFER_SIZE);
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memset(write_buffer, 0, WRITE_BUFFER_SIZE);
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} else {
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if (map_file() == -1) {
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/* mmap failed, try to recover by clobbering */
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new_file = 1;
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write_buffer = NULL;
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cur_buffer_size = 0;
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resize_write_buffer(WRITE_BUFFER_SIZE);
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memset(write_buffer, 0, WRITE_BUFFER_SIZE);
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}
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}
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/* gcda file, version, stamp checksum. */
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write_bytes("adcg", 4);
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write_bytes(version, 4);
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write_32bit_value(checksum);
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#ifdef DEBUG_GCDAPROFILING
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fprintf(stderr, "llvmgcda: [%s]\n", orig_filename);
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#endif
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}
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/* Given an array of pointers to counters (counters), increment the n-th one,
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* where we're also given a pointer to n (predecessor).
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*/
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void llvm_gcda_increment_indirect_counter(uint32_t *predecessor,
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uint64_t **counters) {
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uint64_t *counter;
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uint32_t pred;
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pred = *predecessor;
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if (pred == 0xffffffff)
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return;
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counter = counters[pred];
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/* Don't crash if the pred# is out of sync. This can happen due to threads,
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or because of a TODO in GCOVProfiling.cpp buildEdgeLookupTable(). */
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if (counter)
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++*counter;
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#ifdef DEBUG_GCDAPROFILING
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else
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fprintf(stderr,
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"llvmgcda: increment_indirect_counter counters=%08llx, pred=%u\n",
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*counter, *predecessor);
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#endif
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}
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void llvm_gcda_emit_function(uint32_t ident, const char *function_name,
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uint32_t func_checksum, uint8_t use_extra_checksum,
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uint32_t cfg_checksum) {
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uint32_t len = 2;
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if (use_extra_checksum)
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len++;
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#ifdef DEBUG_GCDAPROFILING
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fprintf(stderr, "llvmgcda: function id=0x%08x name=%s\n", ident,
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function_name ? function_name : "NULL");
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#endif
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if (!output_file) return;
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/* function tag */
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write_bytes("\0\0\0\1", 4);
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if (function_name)
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len += 1 + length_of_string(function_name);
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write_32bit_value(len);
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write_32bit_value(ident);
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write_32bit_value(func_checksum);
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if (use_extra_checksum)
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write_32bit_value(cfg_checksum);
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if (function_name)
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write_string(function_name);
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}
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void llvm_gcda_emit_arcs(uint32_t num_counters, uint64_t *counters) {
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uint32_t i;
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uint64_t *old_ctrs = NULL;
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uint32_t val = 0;
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uint64_t save_cur_pos = cur_pos;
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if (!output_file) return;
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val = read_32bit_value();
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if (val != (uint32_t)-1) {
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/* There are counters present in the file. Merge them. */
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if (val != 0x01a10000) {
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fprintf(stderr, "profiling: %s: cannot merge previous GCDA file: "
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"corrupt arc tag (0x%08x)\n",
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filename, val);
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return;
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}
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val = read_32bit_value();
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if (val == (uint32_t)-1 || val / 2 != num_counters) {
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fprintf(stderr, "profiling: %s: cannot merge previous GCDA file: "
|
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"mismatched number of counters (%d)\n",
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filename, val);
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return;
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}
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old_ctrs = malloc(sizeof(uint64_t) * num_counters);
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for (i = 0; i < num_counters; ++i)
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old_ctrs[i] = read_64bit_value();
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}
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cur_pos = save_cur_pos;
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|
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/* Counter #1 (arcs) tag */
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write_bytes("\0\0\xa1\1", 4);
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write_32bit_value(num_counters * 2);
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for (i = 0; i < num_counters; ++i) {
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counters[i] += (old_ctrs ? old_ctrs[i] : 0);
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write_64bit_value(counters[i]);
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}
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free(old_ctrs);
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|
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#ifdef DEBUG_GCDAPROFILING
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fprintf(stderr, "llvmgcda: %u arcs\n", num_counters);
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for (i = 0; i < num_counters; ++i)
|
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fprintf(stderr, "llvmgcda: %llu\n", (unsigned long long)counters[i]);
|
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#endif
|
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}
|
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|
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void llvm_gcda_summary_info() {
|
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const uint32_t obj_summary_len = 9; /* Length for gcov compatibility. */
|
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uint32_t i;
|
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uint32_t runs = 1;
|
|
uint32_t val = 0;
|
|
uint64_t save_cur_pos = cur_pos;
|
|
|
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if (!output_file) return;
|
|
|
|
val = read_32bit_value();
|
|
|
|
if (val != (uint32_t)-1) {
|
|
/* There are counters present in the file. Merge them. */
|
|
if (val != 0xa1000000) {
|
|
fprintf(stderr, "profiling: %s: cannot merge previous run count: "
|
|
"corrupt object tag (0x%08x)\n",
|
|
filename, val);
|
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return;
|
|
}
|
|
|
|
val = read_32bit_value(); /* length */
|
|
if (val != obj_summary_len) {
|
|
fprintf(stderr, "profiling: %s: cannot merge previous run count: "
|
|
"mismatched object length (%d)\n",
|
|
filename, val);
|
|
return;
|
|
}
|
|
|
|
read_32bit_value(); /* checksum, unused */
|
|
read_32bit_value(); /* num, unused */
|
|
runs += read_32bit_value(); /* Add previous run count to new counter. */
|
|
}
|
|
|
|
cur_pos = save_cur_pos;
|
|
|
|
/* Object summary tag */
|
|
write_bytes("\0\0\0\xa1", 4);
|
|
write_32bit_value(obj_summary_len);
|
|
write_32bit_value(0); /* checksum, unused */
|
|
write_32bit_value(0); /* num, unused */
|
|
write_32bit_value(runs);
|
|
for (i = 3; i < obj_summary_len; ++i)
|
|
write_32bit_value(0);
|
|
|
|
/* Program summary tag */
|
|
write_bytes("\0\0\0\xa3", 4); /* tag indicates 1 program */
|
|
write_32bit_value(0); /* 0 length */
|
|
|
|
#ifdef DEBUG_GCDAPROFILING
|
|
fprintf(stderr, "llvmgcda: %u runs\n", runs);
|
|
#endif
|
|
}
|
|
|
|
void llvm_gcda_end_file() {
|
|
/* Write out EOF record. */
|
|
if (output_file) {
|
|
write_bytes("\0\0\0\0\0\0\0\0", 8);
|
|
|
|
if (new_file) {
|
|
fwrite(write_buffer, cur_pos, 1, output_file);
|
|
free(write_buffer);
|
|
} else {
|
|
unmap_file();
|
|
}
|
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|
|
flock(fd, LOCK_UN);
|
|
fclose(output_file);
|
|
output_file = NULL;
|
|
write_buffer = NULL;
|
|
}
|
|
free(filename);
|
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|
|
#ifdef DEBUG_GCDAPROFILING
|
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fprintf(stderr, "llvmgcda: -----\n");
|
|
#endif
|
|
}
|
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|
|
void llvm_register_writeout_function(writeout_fn fn) {
|
|
struct writeout_fn_node *new_node = malloc(sizeof(struct writeout_fn_node));
|
|
new_node->fn = fn;
|
|
new_node->next = NULL;
|
|
|
|
if (!writeout_fn_head) {
|
|
writeout_fn_head = writeout_fn_tail = new_node;
|
|
} else {
|
|
writeout_fn_tail->next = new_node;
|
|
writeout_fn_tail = new_node;
|
|
}
|
|
}
|
|
|
|
void llvm_writeout_files(void) {
|
|
struct writeout_fn_node *curr = writeout_fn_head;
|
|
|
|
while (curr) {
|
|
curr->fn();
|
|
curr = curr->next;
|
|
}
|
|
}
|
|
|
|
void llvm_delete_writeout_function_list(void) {
|
|
while (writeout_fn_head) {
|
|
struct writeout_fn_node *node = writeout_fn_head;
|
|
writeout_fn_head = writeout_fn_head->next;
|
|
free(node);
|
|
}
|
|
|
|
writeout_fn_head = writeout_fn_tail = NULL;
|
|
}
|
|
|
|
void llvm_register_flush_function(flush_fn fn) {
|
|
struct flush_fn_node *new_node = malloc(sizeof(struct flush_fn_node));
|
|
new_node->fn = fn;
|
|
new_node->next = NULL;
|
|
|
|
if (!flush_fn_head) {
|
|
flush_fn_head = flush_fn_tail = new_node;
|
|
} else {
|
|
flush_fn_tail->next = new_node;
|
|
flush_fn_tail = new_node;
|
|
}
|
|
}
|
|
|
|
void __gcov_flush() {
|
|
struct flush_fn_node *curr = flush_fn_head;
|
|
|
|
while (curr) {
|
|
curr->fn();
|
|
curr = curr->next;
|
|
}
|
|
}
|
|
|
|
void llvm_delete_flush_function_list(void) {
|
|
while (flush_fn_head) {
|
|
struct flush_fn_node *node = flush_fn_head;
|
|
flush_fn_head = flush_fn_head->next;
|
|
free(node);
|
|
}
|
|
|
|
flush_fn_head = flush_fn_tail = NULL;
|
|
}
|
|
|
|
void llvm_gcov_init(writeout_fn wfn, flush_fn ffn) {
|
|
static int atexit_ran = 0;
|
|
|
|
if (wfn)
|
|
llvm_register_writeout_function(wfn);
|
|
|
|
if (ffn)
|
|
llvm_register_flush_function(ffn);
|
|
|
|
if (atexit_ran == 0) {
|
|
atexit_ran = 1;
|
|
|
|
/* Make sure we write out the data and delete the data structures. */
|
|
atexit(llvm_delete_flush_function_list);
|
|
atexit(llvm_delete_writeout_function_list);
|
|
atexit(llvm_writeout_files);
|
|
}
|
|
}
|