664 lines
17 KiB
C
664 lines
17 KiB
C
/*===- GCDAProfiling.c - Support library for GCDA file emission -----------===*\
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|*
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|* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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|* See https://llvm.org/LICENSE.txt for license information.
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|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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#if !defined(__Fuchsia__)
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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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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include "WindowsMMap.h"
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#else
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#include <sys/file.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <unistd.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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#include "InstrProfiling.h"
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#include "InstrProfilingUtil.h"
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/* #define DEBUG_GCDAPROFILING */
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enum {
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GCOV_DATA_MAGIC = 0x67636461, // "gcda"
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GCOV_TAG_FUNCTION = 0x01000000,
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GCOV_TAG_COUNTER_ARCS = 0x01a10000,
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// GCOV_TAG_OBJECT_SUMMARY superseded GCOV_TAG_PROGRAM_SUMMARY in GCC 9.
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GCOV_TAG_OBJECT_SUMMARY = 0xa1000000,
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GCOV_TAG_PROGRAM_SUMMARY = 0xa3000000,
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};
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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 unsigned 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 gcov_version;
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#if defined(_WIN32)
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static HANDLE mmap_handle = NULL;
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#endif
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static int fd = -1;
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typedef void (*fn_ptr)();
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typedef void* dynamic_object_id;
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// The address of this variable identifies a given dynamic object.
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static dynamic_object_id current_id;
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#define CURRENT_ID (¤t_id)
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struct fn_node {
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dynamic_object_id id;
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fn_ptr fn;
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struct fn_node* next;
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};
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struct fn_list {
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struct fn_node *head, *tail;
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};
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/*
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* A list of functions to write out the data, shared between all dynamic objects.
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*/
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struct fn_list writeout_fn_list;
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/*
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* A list of reset functions, shared between all dynamic objects.
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*/
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struct fn_list reset_fn_list;
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static void fn_list_insert(struct fn_list* list, fn_ptr fn) {
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struct fn_node* new_node = malloc(sizeof(struct fn_node));
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new_node->fn = fn;
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new_node->next = NULL;
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new_node->id = CURRENT_ID;
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if (!list->head) {
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list->head = list->tail = new_node;
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} else {
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list->tail->next = new_node;
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list->tail = new_node;
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}
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}
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static void fn_list_remove(struct fn_list* list) {
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struct fn_node* curr = list->head;
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struct fn_node* prev = NULL;
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struct fn_node* next = NULL;
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while (curr) {
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next = curr->next;
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if (curr->id == CURRENT_ID) {
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if (curr == list->head) {
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list->head = next;
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}
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if (curr == list->tail) {
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list->tail = prev;
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}
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if (prev) {
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prev->next = next;
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}
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free(curr);
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} else {
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prev = curr;
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}
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curr = next;
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}
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}
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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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// GCOV uses a lo-/hi-word format even on big-endian systems.
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// See also GCOVBuffer::readInt64 in LLVM.
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uint32_t lo = (uint32_t) i;
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uint32_t hi = (uint32_t) (i >> 32);
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write_32bit_value(lo);
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write_32bit_value(hi);
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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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// GCOV uses a lo-/hi-word format even on big-endian systems.
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// See also GCOVBuffer::readInt64 in LLVM.
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uint32_t lo = read_32bit_value();
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uint32_t hi = read_32bit_value();
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return ((uint64_t)hi << 32) | ((uint64_t)lo);
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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 prefix_len;
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int prefix_strip;
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const char *prefix = lprofGetPathPrefix(&prefix_strip, &prefix_len);
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if (prefix == NULL)
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return strdup(orig_filename);
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new_filename = malloc(prefix_len + 1 + strlen(orig_filename) + 1);
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lprofApplyPathPrefix(new_filename, orig_filename, prefix, prefix_len,
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prefix_strip);
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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 means the file has been created just now (possibly by another
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* process in lock-after-open race condition). No need to mmap. */
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if (file_size == 0)
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return -1;
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#if defined(_WIN32)
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HANDLE mmap_fd;
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if (fd == -1)
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mmap_fd = INVALID_HANDLE_VALUE;
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else
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mmap_fd = (HANDLE)_get_osfhandle(fd);
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mmap_handle = CreateFileMapping(mmap_fd, NULL, PAGE_READWRITE, DWORD_HI(file_size), DWORD_LO(file_size), NULL);
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if (mmap_handle == NULL) {
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fprintf(stderr, "profiling: %s: cannot create file mapping: %lu\n",
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filename, GetLastError());
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return -1;
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}
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write_buffer = MapViewOfFile(mmap_handle, FILE_MAP_WRITE, 0, 0, file_size);
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if (write_buffer == NULL) {
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fprintf(stderr, "profiling: %s: cannot map: %lu\n", filename,
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GetLastError());
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CloseHandle(mmap_handle);
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return -1;
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}
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#else
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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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#endif
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return 0;
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}
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static void unmap_file() {
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#if defined(_WIN32)
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if (!FlushViewOfFile(write_buffer, file_size)) {
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fprintf(stderr, "profiling: %s: cannot flush mapped view: %lu\n", filename,
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GetLastError());
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}
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if (!UnmapViewOfFile(write_buffer)) {
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fprintf(stderr, "profiling: %s: cannot unmap mapped view: %lu\n", filename,
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GetLastError());
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}
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if (!CloseHandle(mmap_handle)) {
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fprintf(stderr, "profiling: %s: cannot close file mapping handle: %lu\n",
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filename, GetLastError());
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}
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mmap_handle = NULL;
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#else
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if (munmap(write_buffer, file_size) == -1) {
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int errnum = errno;
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fprintf(stderr, "profiling: %s: cannot munmap: %s\n", filename,
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strerror(errnum));
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}
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#endif
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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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COMPILER_RT_VISIBILITY
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void llvm_gcda_start_file(const char *orig_filename, uint32_t version,
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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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fd = open(filename, O_RDWR | O_BINARY);
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if (fd == -1) {
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/* Try creating the file. */
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fd = open(filename, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0644);
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if (fd != -1) {
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mode = "w+b";
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} else {
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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 | O_EXCL | O_BINARY, 0644);
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if (fd != -1) {
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mode = "w+b";
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} else {
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/* Another process may have created the file just now.
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* Try opening it without O_CREAT and O_EXCL. */
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fd = open(filename, O_RDWR | O_BINARY);
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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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}
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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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lprofLockFd(fd);
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output_file = fdopen(fd, mode);
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/* Initialize the write buffer. */
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new_file = 0;
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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 (map_file() == -1) {
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/* The file has been created just now (file_size == 0) or mmap failed
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* unexpectedly. In the latter case, try to recover by clobbering. */
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new_file = 1;
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write_buffer = NULL;
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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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/* gcda file, version, stamp checksum. */
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{
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uint8_t c3 = version >> 24;
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uint8_t c2 = (version >> 16) & 255;
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uint8_t c1 = (version >> 8) & 255;
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gcov_version = c3 >= 'A' ? (c3 - 'A') * 100 + (c2 - '0') * 10 + c1 - '0'
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: (c3 - '0') * 10 + c1 - '0';
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}
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write_32bit_value(GCOV_DATA_MAGIC);
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write_32bit_value(version);
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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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COMPILER_RT_VISIBILITY
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void llvm_gcda_emit_function(uint32_t ident, uint32_t func_checksum,
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uint32_t cfg_checksum) {
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uint32_t len = 2;
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int use_extra_checksum = gcov_version >= 47;
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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\n", ident);
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#endif
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if (!output_file) return;
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/* function tag */
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write_32bit_value(GCOV_TAG_FUNCTION);
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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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}
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COMPILER_RT_VISIBILITY
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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 != GCOV_TAG_COUNTER_ARCS) {
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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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/* Counter #1 (arcs) tag */
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write_32bit_value(GCOV_TAG_COUNTER_ARCS);
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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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#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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COMPILER_RT_VISIBILITY
|
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void llvm_gcda_summary_info() {
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uint32_t runs = 1;
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static uint32_t run_counted = 0; // We only want to increase the run count once.
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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 != (gcov_version >= 90 ? GCOV_TAG_OBJECT_SUMMARY
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: GCOV_TAG_PROGRAM_SUMMARY)) {
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fprintf(stderr,
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"profiling: %s: cannot merge previous run count: "
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"corrupt object 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(); /* length */
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uint32_t prev_runs;
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if (gcov_version < 90) {
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read_32bit_value();
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read_32bit_value();
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prev_runs = read_32bit_value();
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} else {
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prev_runs = read_32bit_value();
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read_32bit_value();
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}
|
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for (uint32_t i = gcov_version < 90 ? 3 : 2; i < val; ++i)
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read_32bit_value();
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/* Add previous run count to new counter, if not already counted before. */
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|
runs = run_counted ? prev_runs : prev_runs + 1;
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}
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cur_pos = save_cur_pos;
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|
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if (gcov_version >= 90) {
|
|
write_32bit_value(GCOV_TAG_OBJECT_SUMMARY);
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write_32bit_value(2);
|
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write_32bit_value(runs);
|
|
write_32bit_value(0); // sum_max
|
|
} else {
|
|
// Before gcov 4.8 (r190952), GCOV_TAG_SUMMARY_LENGTH was 9. r190952 set
|
|
// GCOV_TAG_SUMMARY_LENGTH to 22. We simply use the smallest length which
|
|
// can make gcov read "Runs:".
|
|
write_32bit_value(GCOV_TAG_PROGRAM_SUMMARY);
|
|
write_32bit_value(3);
|
|
write_32bit_value(0);
|
|
write_32bit_value(0);
|
|
write_32bit_value(runs);
|
|
}
|
|
|
|
run_counted = 1;
|
|
|
|
#ifdef DEBUG_GCDAPROFILING
|
|
fprintf(stderr, "llvmgcda: %u runs\n", runs);
|
|
#endif
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
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();
|
|
}
|
|
|
|
fflush(output_file);
|
|
lprofUnlockFd(fd);
|
|
fclose(output_file);
|
|
output_file = NULL;
|
|
write_buffer = NULL;
|
|
}
|
|
free(filename);
|
|
|
|
#ifdef DEBUG_GCDAPROFILING
|
|
fprintf(stderr, "llvmgcda: -----\n");
|
|
#endif
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
void llvm_register_writeout_function(fn_ptr fn) {
|
|
fn_list_insert(&writeout_fn_list, fn);
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
void llvm_writeout_files(void) {
|
|
struct fn_node *curr = writeout_fn_list.head;
|
|
|
|
while (curr) {
|
|
if (curr->id == CURRENT_ID) {
|
|
curr->fn();
|
|
}
|
|
curr = curr->next;
|
|
}
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
// __attribute__((destructor)) and destructors whose priorities are greater than
|
|
// 100 run before this function and can thus be tracked. The priority is
|
|
// compatible with GCC 7 onwards.
|
|
#if __GNUC__ >= 9
|
|
#pragma GCC diagnostic ignored "-Wprio-ctor-dtor"
|
|
#endif
|
|
__attribute__((destructor(100)))
|
|
#endif
|
|
static void llvm_writeout_and_clear(void) {
|
|
llvm_writeout_files();
|
|
fn_list_remove(&writeout_fn_list);
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
void llvm_register_reset_function(fn_ptr fn) {
|
|
fn_list_insert(&reset_fn_list, fn);
|
|
}
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
void llvm_delete_reset_function_list(void) { fn_list_remove(&reset_fn_list); }
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
void llvm_reset_counters(void) {
|
|
struct fn_node *curr = reset_fn_list.head;
|
|
|
|
while (curr) {
|
|
if (curr->id == CURRENT_ID) {
|
|
curr->fn();
|
|
}
|
|
curr = curr->next;
|
|
}
|
|
}
|
|
|
|
#if !defined(_WIN32)
|
|
COMPILER_RT_VISIBILITY
|
|
pid_t __gcov_fork() {
|
|
pid_t parent_pid = getpid();
|
|
pid_t pid = fork();
|
|
|
|
if (pid == 0) {
|
|
pid_t child_pid = getpid();
|
|
if (child_pid != parent_pid) {
|
|
// The pid changed so we've a fork (one could have its own fork function)
|
|
// Just reset the counters for this child process
|
|
// threads.
|
|
llvm_reset_counters();
|
|
}
|
|
}
|
|
return pid;
|
|
}
|
|
#endif
|
|
|
|
COMPILER_RT_VISIBILITY
|
|
void llvm_gcov_init(fn_ptr wfn, fn_ptr rfn) {
|
|
static int atexit_ran = 0;
|
|
|
|
if (wfn)
|
|
llvm_register_writeout_function(wfn);
|
|
|
|
if (rfn)
|
|
llvm_register_reset_function(rfn);
|
|
|
|
if (atexit_ran == 0) {
|
|
atexit_ran = 1;
|
|
|
|
/* Make sure we write out the data and delete the data structures. */
|
|
atexit(llvm_delete_reset_function_list);
|
|
#ifdef _WIN32
|
|
atexit(llvm_writeout_and_clear);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void __gcov_dump(void) {
|
|
for (struct fn_node *f = writeout_fn_list.head; f; f = f->next)
|
|
f->fn();
|
|
}
|
|
|
|
void __gcov_reset(void) {
|
|
for (struct fn_node *f = reset_fn_list.head; f; f = f->next)
|
|
f->fn();
|
|
}
|
|
|
|
#endif
|