X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/16b22f00c0637147274433d9ec84bf05867b0b0f..983a8a691054ecec4cdc7d3a932942520f834f43:/src/mc/Process.cpp diff --git a/src/mc/Process.cpp b/src/mc/Process.cpp index 33eb20113f..08f4944ef9 100644 --- a/src/mc/Process.cpp +++ b/src/mc/Process.cpp @@ -1,16 +1,19 @@ -/* Copyright (c) 2014-2015. The SimGrid Team. - * All rights reserved. */ +/* Copyright (c) 2014-2017. The SimGrid Team. All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it * under the terms of the license (GNU LGPL) which comes with this package. */ -#define _FILE_OFFSET_BITS 64 +#define _FILE_OFFSET_BITS 64 /* needed for pread_whole to work as expected on 32bits */ #include #include #include #include +#include + +#include + #include #include #include @@ -24,14 +27,12 @@ #include #include -#include -#include -#include +#include "xbt/base.h" +#include "xbt/log.h" #include #include "src/mc/mc_unw.h" #include "src/mc/mc_snapshot.h" -#include "src/mc/mc_ignore.h" #include "src/mc/mc_smx.h" #include "src/mc/Process.hpp" @@ -52,40 +53,55 @@ namespace mc { #define SO_RE "\\.so[\\.0-9]*$" #define VERSION_RE "-[\\.0-9-]*$" -// In lexicographic order (but this is currently not used in the code): -static const char *const filtered_libraries[] = { - "ld", - "libbz2", - "libboost_chrono", - "libboost_context", - "libboost_system", - "libboost_thread", - "libc", - "libc++", - "libcdt", - "libcgraph", - "libdl", - "libdw", - "libelf", - "libgcc_s", - "liblua5.1", - "liblua5.3", - "liblzma", - "libm", - "libpthread", - "librt", - "libsigc", - "libstdc++", - "libunwind", - "libunwind-x86_64", - "libunwind-x86", - "libunwind-ptrace", - "libz" -}; +// List of library which memory segments are not considered: +static const char* const filtered_libraries[] = { +#ifdef __linux__ + "ld", +#elif defined __FreeBSD__ + "ld-elf", + "ld-elf32", + "libkvm", /* kernel data access library */ + "libprocstat", /* process and file information retrieval */ + "libthr", /* thread library */ + "libutil", +#endif + "libasan", /* gcc sanitizers */ + "libargp", /* workarounds for glibc-less systems */ + "libtsan", + "libubsan", + "libbz2", + "libboost_chrono", + "libboost_context", + "libboost_context-mt", + "libboost_system", + "libboost_thread", + "libc", + "libc++", + "libcdt", + "libcgraph", + "libcrypto", + "libcxxrt", + "libdl", + "libdw", + "libelf", + "libevent", + "libgcc_s", + "liblua5.1", + "liblua5.3", + "liblzma", + "libm", + "libpthread", + "librt", + "libstdc++", + "libunwind", + "libunwind-x86_64", + "libunwind-x86", + "libunwind-ptrace", + "libz"}; static bool is_simgrid_lib(const char* libname) { - return !strcmp(libname, "libsimgrid"); + return not strcmp(libname, "libsimgrid"); } static bool is_filtered_lib(const char* libname) @@ -116,7 +132,7 @@ static char* get_lib_name(const char* pathname, struct s_mc_memory_map_re* res) map_basename = nullptr; // Strip the version suffix: - if(libname && !regexec(&res->version_re, libname, 1, &match, 0)) { + if (libname && not regexec(&res->version_re, libname, 1, &match, 0)) { char* temp = libname; libname = strndup(temp, match.rm_so); free(temp); @@ -125,12 +141,12 @@ static char* get_lib_name(const char* pathname, struct s_mc_memory_map_re* res) return libname; } -static ssize_t pread_whole(int fd, void *buf, size_t count, std::uint64_t offset) +static ssize_t pread_whole(int fd, void *buf, size_t count, off_t offset) { char* buffer = (char*) buf; ssize_t real_count = count; while (count) { - ssize_t res = pread(fd, buffer, count, (std::int64_t) offset); + ssize_t res = pread(fd, buffer, count, offset); if (res > 0) { count -= res; buffer += res; @@ -167,7 +183,7 @@ static pthread_once_t zero_buffer_flag = PTHREAD_ONCE_INIT; static const void* zero_buffer; static const size_t zero_buffer_size = 10 * 4096; -static void zero_buffer_init(void) +static void zero_buffer_init() { int fd = open("/dev/zero", O_RDONLY); if (fd<0) @@ -178,14 +194,6 @@ static void zero_buffer_init(void) close(fd); } -static -int open_process_file(pid_t pid, const char* file, int flags) -{ - char buff[50]; - snprintf(buff, sizeof(buff), "/proc/%li/%s", (long) pid, file); - return open(buff, flags); -} - int open_vm(pid_t pid, int flags) { const size_t buffer_size = 30; @@ -216,16 +224,16 @@ void Process::init() // Read std_heap (is a struct mdesc*): simgrid::mc::Variable* std_heap_var = this->find_variable("__mmalloc_default_mdp"); - if (!std_heap_var) + if (not std_heap_var) xbt_die("No heap information in the target process"); - if(!std_heap_var->address) + if (not std_heap_var->address) xbt_die("No constant address for this variable"); this->read_bytes(&this->heap_address, sizeof(struct mdesc*), remote(std_heap_var->address), simgrid::mc::ProcessIndexDisabled); - this->smx_process_infos.clear(); - this->smx_old_process_infos.clear(); + this->smx_actors_infos.clear(); + this->smx_dead_actors_infos.clear(); this->unw_addr_space = simgrid::mc::UnwindContext::createUnwindAddressSpace(); this->unw_underlying_addr_space = simgrid::unw::create_addr_space(); this->unw_underlying_context = simgrid::unw::create_context( @@ -238,27 +246,24 @@ Process::~Process() close(this->memory_file); if (this->unw_underlying_addr_space != unw_local_addr_space) { - unw_destroy_addr_space(this->unw_underlying_addr_space); - _UPT_destroy(this->unw_underlying_context); + if (this->unw_underlying_addr_space) + unw_destroy_addr_space(this->unw_underlying_addr_space); + if (this->unw_underlying_context) + _UPT_destroy(this->unw_underlying_context); } unw_destroy_addr_space(this->unw_addr_space); - - if (this->clear_refs_fd_ >= 0) - close(this->clear_refs_fd_); - if (this->pagemap_fd_ >= 0) - close(this->pagemap_fd_); } /** Refresh the information about the process * - * Do not use direclty, this is used by the getters when appropriate + * Do not use directly, this is used by the getters when appropriate * in order to have fresh data. */ void Process::refresh_heap() { // Read/dereference/refresh the std_heap pointer: - if (!this->heap) + if (not this->heap) this->heap = std::unique_ptr(new s_xbt_mheap_t()); this->read_bytes(this->heap.get(), sizeof(struct mdesc), remote(this->heap_address), simgrid::mc::ProcessIndexDisabled); @@ -316,7 +321,7 @@ void Process::init_memory_map_info() // [stack], [vvar], [vsyscall], [vdso] ... if (pathname[0] == '[') { - if ((reg.prot & PROT_WRITE) && !memcmp(pathname, "[stack]", 7)) { + if ((reg.prot & PROT_WRITE) && not memcmp(pathname, "[stack]", 7)) { this->maestro_stack_start_ = remote(reg.start_addr); this->maestro_stack_end_ = remote(reg.end_addr); } @@ -328,14 +333,14 @@ void Process::init_memory_map_info() continue; current_name = pathname; - if (!(reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) + if (not(reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) continue; - const bool is_executable = !i; + const bool is_executable = not i; char* libname = nullptr; - if (!is_executable) { + if (not is_executable) { libname = get_lib_name(pathname, &res); - if(!libname) + if (not libname) continue; if (is_filtered_lib(libname)) { free(libname); @@ -356,7 +361,7 @@ void Process::init_memory_map_info() regfree(&res.so_re); regfree(&res.version_re); - // Resolve time (including accross differents objects): + // Resolve time (including across different objects): for (auto const& object_info : this->object_infos) postProcessObjectInformation(this, object_info.get()); @@ -399,14 +404,14 @@ simgrid::mc::Frame* Process::find_function(RemotePtr ip) const return info ? info->find_function((void*) ip.address()) : nullptr; } -/** Find (one occurence of) the named variable definition +/** Find (one occurrence of) the named variable definition */ simgrid::mc::Variable* Process::find_variable(const char* name) const { // First lookup the variable in the executable shared object. // A global variable used directly by the executable code from a library // is reinstanciated in the executable memory .data/.bss. - // We need to look up the variable in the execvutable first. + // We need to look up the variable in the executable first. if (this->binary_info) { std::shared_ptr const& info = this->binary_info; simgrid::mc::Variable* var = info->find_variable(name); @@ -426,27 +431,24 @@ simgrid::mc::Variable* Process::find_variable(const char* name) const void Process::read_variable(const char* name, void* target, size_t size) const { simgrid::mc::Variable* var = this->find_variable(name); - if (!var->address) - xbt_die("No simple location for this variable"); - if (!var->type->full_type) - xbt_die("Partial type for %s, cannot check size", name); - if ((size_t) var->type->full_type->byte_size != size) - xbt_die("Unexpected size for %s (expected %zi, was %zi)", - name, size, (size_t) var->type->full_type->byte_size); + xbt_assert(var->address, "No simple location for this variable"); + xbt_assert(var->type->full_type, "Partial type for %s, cannot check size", name); + xbt_assert((size_t)var->type->full_type->byte_size == size, "Unexpected size for %s (expected %zi, was %zi)", name, + size, (size_t)var->type->full_type->byte_size); this->read_bytes(target, size, remote(var->address)); } -char* Process::read_string(RemotePtr address) const +std::string Process::read_string(RemotePtr address) const { - if (!address) - return nullptr; + if (not address) + return {}; - off_t len = 128; - char* res = (char*) malloc(len); + // TODO, use std::vector with .data() in C++17 to avoid useless copies + std::vector res(128); off_t off = 0; while (1) { - ssize_t c = pread(this->memory_file, res + off, len - off, (off_t) address.address() + off); + ssize_t c = pread(this->memory_file, res.data() + off, res.size() - off, (off_t) address.address() + off); if (c == -1) { if (errno == EINTR) continue; @@ -456,15 +458,13 @@ char* Process::read_string(RemotePtr address) const if (c==0) xbt_die("Could not read string from remote process"); - void* p = memchr(res + off, '\0', c); + void* p = memchr(res.data() + off, '\0', c); if (p) - return res; + return std::string(res.data()); off += c; - if (off == len) { - len *= 2; - res = (char*) realloc(res, len); - } + if (off == (off_t) res.size()) + res.resize(res.size() * 2); } } @@ -492,28 +492,26 @@ const void *Process::read_bytes(void* buffer, std::size_t size, mc_model_checker->process().read( remote(remote_smpi_privatisation_regions + process_index)); - // Address translation in the privaization segment: + // Address translation in the privatization segment: size_t offset = address.address() - (std::uint64_t)info->start_rw; address = remote((char*)privatisation_region.address + offset); } #endif } - - if (pread_whole(this->memory_file, buffer, size, address.address()) < 0) - xbt_die("Read from process %lli failed", (long long) this->pid_); + if (pread_whole(this->memory_file, buffer, size, (size_t) address.address()) < 0) + xbt_die("Read at %p from process %lli failed", (void*)address.address(), (long long)this->pid_); return buffer; } /** Write data to a process memory * - * @param process the process - * @param local local memory address (source) - * @param remote target process memory address (target) - * @param len data size + * @param buffer local memory address (source) + * @param len data size + * @param address target process memory address (target) */ void Process::write_bytes(const void* buffer, size_t len, RemotePtr address) { - if (pwrite_whole(this->memory_file, buffer, len, address.address()) < 0) + if (pwrite_whole(this->memory_file, buffer, len, (size_t)address.address()) < 0) xbt_die("Write to process %lli failed", (long long) this->pid_); } @@ -574,30 +572,6 @@ void Process::ignore_region(std::uint64_t addr, std::size_t size) ignored_regions_.begin() + position, region); } -void Process::reset_soft_dirty() -{ - if (this->clear_refs_fd_ < 0) { - this->clear_refs_fd_ = open_process_file(pid_, "clear_refs", O_WRONLY|O_CLOEXEC); - if (this->clear_refs_fd_ < 0) - xbt_die("Could not open clear_refs file for soft-dirty tracking. Run as root?"); - } - if(::write(this->clear_refs_fd_, "4\n", 2) != 2) - xbt_die("Could not reset softdirty bits"); -} - -void Process::read_pagemap(uint64_t* pagemap, size_t page_start, size_t page_count) -{ - if (pagemap_fd_ < 0) { - pagemap_fd_ = open_process_file(pid_, "pagemap", O_RDONLY|O_CLOEXEC); - if (pagemap_fd_ < 0) - xbt_die("Could not open pagemap file for soft-dirty tracking. Run as root?"); - } - ssize_t bytesize = sizeof(uint64_t) * page_count; - off_t offset = sizeof(uint64_t) * page_start; - if (pread_whole(pagemap_fd_, pagemap, bytesize, offset) != bytesize) - xbt_die("Could not read pagemap"); -} - void Process::ignore_heap(IgnoredHeapRegion const& region) { if (ignored_heap_.empty()) { @@ -669,16 +643,46 @@ void Process::ignore_local_variable(const char *var_name, const char *frame_name info->remove_local_variable(var_name, frame_name); } -std::vector& Process::simix_processes() +std::vector& Process::actors() { this->refresh_simix(); - return smx_process_infos; + return smx_actors_infos; } -std::vector& Process::old_simix_processes() +std::vector& Process::dead_actors() { this->refresh_simix(); - return smx_old_process_infos; + return smx_dead_actors_infos; +} + +void Process::dumpStack() +{ + unw_addr_space_t as = unw_create_addr_space(&_UPT_accessors, BYTE_ORDER); + if (as == nullptr) { + XBT_ERROR("Could not initialize ptrace address space"); + return; + } + + void* context = _UPT_create(this->pid_); + if (context == nullptr) { + unw_destroy_addr_space(as); + XBT_ERROR("Could not initialize ptrace context"); + return; + } + + unw_cursor_t cursor; + if (unw_init_remote(&cursor, as, context) != 0) { + _UPT_destroy(context); + unw_destroy_addr_space(as); + XBT_ERROR("Could not initialiez ptrace cursor"); + return; + } + + simgrid::mc::dumpStack(stderr, cursor); + + _UPT_destroy(context); + unw_destroy_addr_space(as); + return; } }