342 lines
9.5 KiB
C++
342 lines
9.5 KiB
C++
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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/*
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* Logging infrastructure that aims to support multi-threading
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*/
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#include "rust_log.h"
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#include "rust_crate_map.h"
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#include "util/array_list.h"
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#include "rust_util.h"
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#include "rust_task.h"
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/**
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* Synchronizes access to the underlying logging mechanism.
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*/
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static lock_and_signal _log_lock;
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/**
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* Indicates whether we are outputting to the console.
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* Protected by _log_lock;
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*/
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static bool _log_to_console = true;
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/*
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* Request that console logging be turned on.
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*/
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void
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log_console_on() {
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scoped_lock with(_log_lock);
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_log_to_console = true;
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}
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/*
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* Request that console logging be turned off. Can be
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* overridden by the environment.
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*/
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void
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log_console_off(rust_env *env) {
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scoped_lock with(_log_lock);
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if (env->logspec == NULL) {
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_log_to_console = false;
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}
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}
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rust_log::rust_log(rust_sched_loop *sched_loop) :
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_sched_loop(sched_loop) {
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}
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rust_log::~rust_log() {
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}
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const uint16_t
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hash(uintptr_t ptr) {
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# if(ULONG_MAX == 0xFFFFFFFF)
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// Robert Jenkins' 32 bit integer hash function
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ptr = (ptr + 0x7ed55d16) + (ptr << 12);
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ptr = (ptr ^ 0xc761c23c) ^ (ptr >> 19);
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ptr = (ptr + 0x165667b1) + (ptr << 5);
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ptr = (ptr + 0xd3a2646c) ^ (ptr << 9);
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ptr = (ptr + 0xfd7046c5) + (ptr << 3);
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ptr = (ptr ^ 0xb55a4f09) ^ (ptr >> 16);
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# elif(ULONG_MAX == 0xFFFFFFFFFFFFFFFF)
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// "hash64shift()" from http://www.concentric.net/~Ttwang/tech/inthash.htm
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ptr = (~ptr) + (ptr << 21); // ptr = (ptr << 21) - ptr - 1;
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ptr = ptr ^ (ptr >> 24);
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ptr = (ptr + (ptr << 3)) + (ptr << 8); // ptr * 265
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ptr = ptr ^ (ptr >> 14);
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ptr = (ptr + (ptr << 2)) + (ptr << 4); // ptr * 21
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ptr = ptr ^ (ptr >> 28);
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ptr = ptr + (ptr << 31);
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# else
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# error "hash() not defined for this pointer size"
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# endif
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return (uint16_t) ptr;
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}
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char *
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copy_string(char *dst, const char *src, size_t length) {
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return strncpy(dst, src, length) + length;
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}
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char *
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append_string(char *buffer, const char *format, ...) {
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if (buffer != NULL && format) {
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va_list args;
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va_start(args, format);
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size_t off = strlen(buffer);
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vsnprintf(buffer + off, BUF_BYTES - off, format, args);
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va_end(args);
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}
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return buffer;
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}
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void
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rust_log::log(rust_task* task, uint32_t level, char const *fmt, ...) {
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char buf[BUF_BYTES];
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va_list args;
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va_start(args, fmt);
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int formattedbytes = vsnprintf(buf, sizeof(buf), fmt, args);
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if( formattedbytes and (unsigned)formattedbytes > BUF_BYTES ){
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const char truncatedstr[] = "[...]";
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memcpy( &buf[BUF_BYTES-sizeof(truncatedstr)],
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truncatedstr,
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sizeof(truncatedstr));
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}
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trace_ln(task, level, buf);
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va_end(args);
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}
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void
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rust_log::trace_ln(char *prefix, char *message) {
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char buffer[BUF_BYTES] = "";
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_log_lock.lock();
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append_string(buffer, "%s", prefix);
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append_string(buffer, "%s", message);
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if (_log_to_console) {
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fprintf(stderr, "rust: %s\n", buffer);
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fflush(stderr);
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}
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_log_lock.unlock();
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}
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void
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rust_log::trace_ln(rust_task *task, uint32_t level, char *message) {
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if (task) {
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// There is not enough room to be logging on the rust stack
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assert(!task->on_rust_stack() && "logging on rust stack");
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}
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// FIXME (#2672): The scheduler and task names used to have meaning,
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// but they are always equal to 'main' currently
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#if 0
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#if defined(__WIN32__)
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uint32_t thread_id = 0;
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#else
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uint32_t thread_id = hash((uintptr_t) pthread_self());
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#endif
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char prefix[BUF_BYTES] = "";
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if (_sched_loop && _sched_loop-.name) {
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append_string(prefix, "%04" PRIxPTR ":%.10s:",
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thread_id, _sched_loop->name);
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} else {
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append_string(prefix, "%04" PRIxPTR ":0x%08" PRIxPTR ":",
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thread_id, (uintptr_t) _sched_loop);
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}
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if (task) {
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if (task->name) {
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append_string(prefix, "%.10s:", task->name);
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} else {
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append_string(prefix, "0x%08" PRIxPTR ":", (uintptr_t) task);
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}
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}
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#else
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char prefix[BUF_BYTES] = "";
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#endif
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trace_ln(prefix, message);
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}
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// Reading log directives and setting log level vars
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struct log_directive {
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char* name;
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size_t level;
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};
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const size_t max_log_directives = 255;
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const size_t max_log_level = 255;
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const size_t default_log_level = log_err;
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// This is a rather ugly parser for strings in the form
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// "crate1,crate2.mod3,crate3.x=1". Log levels are 0-255,
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// with the most likely ones being 0-3 (defined in core::).
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size_t parse_logging_spec(char* spec, log_directive* dirs) {
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size_t dir = 0;
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while (dir < max_log_directives && *spec) {
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char* start = spec;
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char cur;
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while (true) {
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cur = *spec;
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if (cur == ',' || cur == '=' || cur == '\0') {
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if (start == spec) {spec++; break;}
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if (*spec != '\0') {
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*spec = '\0';
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spec++;
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}
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size_t level = max_log_level;
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if (cur == '=' && *spec != '\0') {
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level = *spec - '0';
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if (level > max_log_level) level = max_log_level;
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if (*spec) ++spec;
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}
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dirs[dir].name = start;
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dirs[dir++].level = level;
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break;
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} else {
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spec++;
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}
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}
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}
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return dir;
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}
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struct update_entry_args {
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log_directive* dirs;
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size_t n_dirs;
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size_t *n_matches;
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};
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static void update_entry(const mod_entry* entry, void *cookie) {
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update_entry_args *args = (update_entry_args *)cookie;
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size_t level = default_log_level, longest_match = 0;
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for (size_t d = 0; d < args->n_dirs; d++) {
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if (strstr(entry->name, args->dirs[d].name) == entry->name &&
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strlen(args->dirs[d].name) > longest_match) {
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longest_match = strlen(args->dirs[d].name);
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level = args->dirs[d].level;
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}
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}
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*entry->state = level;
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(*args->n_matches)++;
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}
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void update_module_map(const mod_entry* map, log_directive* dirs,
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size_t n_dirs, size_t *n_matches) {
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update_entry_args args = { dirs, n_dirs, n_matches };
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iter_module_map(map, update_entry, &args);
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}
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void update_crate_map(const cratemap* map, log_directive* dirs,
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size_t n_dirs, size_t *n_matches) {
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update_entry_args args = { dirs, n_dirs, n_matches };
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iter_crate_map(map, update_entry, &args);
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}
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void print_mod_name(const mod_entry* mod, void *cooke) {
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printf(" %s\n", mod->name);
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}
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void print_crate_log_map(const cratemap* map) {
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iter_crate_map(map, print_mod_name, NULL);
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}
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// These are pseudo-modules used to control logging in the runtime.
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uint32_t log_rt_mem;
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uint32_t log_rt_box;
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uint32_t log_rt_comm;
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uint32_t log_rt_task;
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uint32_t log_rt_dom;
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uint32_t log_rt_trace;
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uint32_t log_rt_cache;
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uint32_t log_rt_upcall;
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uint32_t log_rt_timer;
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uint32_t log_rt_gc;
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uint32_t log_rt_stdlib;
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uint32_t log_rt_kern;
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uint32_t log_rt_backtrace;
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uint32_t log_rt_callback;
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static const mod_entry _rt_module_map[] =
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{{"::rt::mem", &log_rt_mem},
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{"::rt::box", &log_rt_box},
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{"::rt::comm", &log_rt_comm},
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{"::rt::task", &log_rt_task},
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{"::rt::dom", &log_rt_dom},
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{"::rt::trace", &log_rt_trace},
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{"::rt::cache", &log_rt_cache},
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{"::rt::upcall", &log_rt_upcall},
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{"::rt::timer", &log_rt_timer},
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{"::rt::gc", &log_rt_gc},
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{"::rt::stdlib", &log_rt_stdlib},
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{"::rt::kern", &log_rt_kern},
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{"::rt::backtrace", &log_rt_backtrace},
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{"::rt::callback", &log_rt_callback},
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{NULL, NULL}};
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void update_log_settings(void* crate_map, char* settings) {
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char* buffer = NULL;
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log_directive dirs[256];
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size_t n_dirs = 0;
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if (settings) {
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if (strcmp(settings, "::help") == 0 ||
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strcmp(settings, "?") == 0) {
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printf("\nCrate log map:\n\n");
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print_crate_log_map((const cratemap*)crate_map);
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printf("\n");
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exit(1);
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}
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size_t buflen = strlen(settings) + 1;
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buffer = (char*)malloc(buflen);
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strncpy(buffer, settings, buflen);
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n_dirs = parse_logging_spec(buffer, &dirs[0]);
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}
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size_t n_matches = 0;
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update_module_map(_rt_module_map, &dirs[0], n_dirs, &n_matches);
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update_crate_map((const cratemap*)crate_map, &dirs[0],
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n_dirs, &n_matches);
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if (n_matches < n_dirs) {
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// NB: Android compiler is complaining about format specifiers here
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// and I don't understand why
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/*printf("warning: got %" PRIdPTR " RUST_LOG specs, "
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"enabled %" PRIdPTR " flags.",
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(uintptr_t)n_dirs, (uintptr_t)n_matches);*/
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}
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free(buffer);
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}
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extern "C" CDECL void
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rust_update_log_settings(void* crate_map, char* settings) {
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update_log_settings(crate_map, settings);
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}
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//
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// Local Variables:
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// mode: C++
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
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// End:
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//
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