X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/218c42a20c7eaba87e20cfb3eaac5ad8e0d0f739..706dd4584b4002e0d948b81d103dd5c4b70db077:/src/mc/Process.cpp diff --git a/src/mc/Process.cpp b/src/mc/Process.cpp index 3af20cb63d..9197cb95e4 100644 --- a/src/mc/Process.cpp +++ b/src/mc/Process.cpp @@ -8,10 +8,13 @@ #include #include -#include #include #include +#include + +#include + #include #include #include @@ -25,33 +28,35 @@ #include #include +#include +#include #include -#include "mc_object_info.h" -#include "mc_unw.h" -#include "mc_snapshot.h" -#include "mc_ignore.h" -#include "mc_smx.h" -#include "mc_server.h" +#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 "mc/Process.hpp" -#include "mc/AddressSpace.hpp" -#include "mc/ObjectInformation.hpp" -#include "mc/Variable.hpp" +#include "src/mc/Process.hpp" +#include "src/mc/AddressSpace.hpp" +#include "src/mc/ObjectInformation.hpp" +#include "src/mc/Variable.hpp" using simgrid::mc::remote; -extern "C" { - XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_process, mc, "MC process information"); // ***** Helper stuff +namespace simgrid { +namespace mc { + #define SO_RE "\\.so[\\.0-9]*$" #define VERSION_RE "-[\\.0-9-]*$" -static const char *const FILTERED_LIBS[] = { +// In lexicographic order (but this is currently not used in the code): +static const char *const filtered_libraries[] = { "ld", "libbz2", "libboost_chrono", @@ -67,11 +72,11 @@ static const char *const FILTERED_LIBS[] = { "libelf", "libgcc_s", "liblua5.1", + "liblua5.3", "liblzma", "libm", "libpthread", "librt", - "libsigc", "libstdc++", "libunwind", "libunwind-x86_64", @@ -80,14 +85,14 @@ static const char *const FILTERED_LIBS[] = { "libz" }; -static bool MC_is_simgrid_lib(const char* libname) +static bool is_simgrid_lib(const char* libname) { return !strcmp(libname, "libsimgrid"); } -static bool MC_is_filtered_lib(const char* libname) +static bool is_filtered_lib(const char* libname) { - for (const char* filtered_lib : FILTERED_LIBS) + for (const char* filtered_lib : filtered_libraries) if (strcmp(libname, filtered_lib)==0) return true; return false; @@ -98,15 +103,19 @@ struct s_mc_memory_map_re { regex_t version_re; }; -static char* MC_get_lib_name(const char* pathname, struct s_mc_memory_map_re* res) +static char* get_lib_name(const char* pathname, struct s_mc_memory_map_re* res) { - const char* map_basename = basename((char*) pathname); + char* map_basename = xbt_basename(pathname); regmatch_t match; - if(regexec(&res->so_re, map_basename, 1, &match, 0)) - return NULL; + if(regexec(&res->so_re, map_basename, 1, &match, 0)) { + free(map_basename); + return nullptr; + } char* libname = strndup(map_basename, match.rm_so); + free(map_basename); + map_basename = nullptr; // Strip the version suffix: if(libname && !regexec(&res->version_re, libname, 1, &match, 0)) { @@ -128,9 +137,9 @@ static ssize_t pread_whole(int fd, void *buf, size_t count, std::uint64_t offset count -= res; buffer += res; offset += res; - } else if (res==0) { + } else if (res==0) return -1; - } else if (errno != EINTR) { + else if (errno != EINTR) { perror("pread_whole"); return -1; } @@ -148,11 +157,10 @@ static ssize_t pwrite_whole(int fd, const void *buf, size_t count, off_t offset) count -= res; buffer += res; offset += res; - } else if (res==0) { + } else if (res==0) return -1; - } else if (errno != EINTR) { + else if (errno != EINTR) return -1; - } } return real_count; } @@ -161,30 +169,17 @@ 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 MC_zero_buffer_init(void) +static void zero_buffer_init(void) { int fd = open("/dev/zero", O_RDONLY); if (fd<0) xbt_die("Could not open /dev/zero"); - zero_buffer = mmap(NULL, zero_buffer_size, PROT_READ, MAP_SHARED, fd, 0); + zero_buffer = mmap(nullptr, zero_buffer_size, PROT_READ, MAP_SHARED, fd, 0); if (zero_buffer == MAP_FAILED) xbt_die("Could not map the zero buffer"); 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); -} - -} - -namespace simgrid { -namespace mc { - int open_vm(pid_t pid, int flags) { const size_t buffer_size = 30; @@ -197,110 +192,66 @@ int open_vm(pid_t pid, int flags) return open(buffer, flags); } - -} -} - // ***** Process -namespace simgrid { -namespace mc { +Process::Process(pid_t pid, int sockfd) : + AddressSpace(this), pid_(pid), channel_(sockfd), running_(true) +{} -Process::Process(pid_t pid, int sockfd) : AddressSpace(this) +void Process::init() { - Process* process = this; - process->socket_ = sockfd; - process->pid_ = pid; - process->running_ = true; - process->status_ = 0; - process->memory_map_ = get_memory_map(pid); - process->cache_flags = MC_PROCESS_CACHE_FLAG_NONE; - process->heap = NULL; - process->heap_info = NULL; - process->init_memory_map_info(); - process->clear_refs_fd_ = -1; - process->pagemap_fd_ = -1; - - int fd = open_vm(process->pid_, O_RDWR); + this->memory_map_ = simgrid::xbt::get_memory_map(this->pid_); + this->init_memory_map_info(); + + int fd = open_vm(this->pid_, O_RDWR); if (fd<0) xbt_die("Could not open file for process virtual address space"); - process->memory_file = fd; + this->memory_file = fd; // Read std_heap (is a struct mdesc*): - simgrid::mc::Variable* std_heap_var = process->find_variable("__mmalloc_default_mdp"); + simgrid::mc::Variable* std_heap_var = this->find_variable("__mmalloc_default_mdp"); if (!std_heap_var) xbt_die("No heap information in the target process"); if(!std_heap_var->address) xbt_die("No constant address for this variable"); - process->read_bytes(&process->heap_address, sizeof(struct mdesc*), + this->read_bytes(&this->heap_address, sizeof(struct mdesc*), remote(std_heap_var->address), simgrid::mc::ProcessIndexDisabled); - process->smx_process_infos = MC_smx_process_info_list_new(); - process->smx_old_process_infos = MC_smx_process_info_list_new(); - process->unw_addr_space = unw_create_addr_space(&mc_unw_accessors , __BYTE_ORDER); - process->unw_underlying_addr_space = unw_create_addr_space(&mc_unw_vmread_accessors, __BYTE_ORDER); - process->unw_underlying_context = _UPT_create(pid); + this->smx_process_infos.clear(); + this->smx_old_process_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( + this->unw_underlying_addr_space, this->pid_); } Process::~Process() { - Process* process = this; - - if (this->socket_ >= 0 && close(this->socket_) < 0) - xbt_die("Could not close communication socket"); + if (this->memory_file >= 0) + close(this->memory_file); - process->pid_ = 0; - - process->maestro_stack_start_ = nullptr; - process->maestro_stack_end_ = nullptr; - - xbt_dynar_free(&process->smx_process_infos); - xbt_dynar_free(&process->smx_old_process_infos); - - if (process->memory_file >= 0) { - close(process->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 (process->unw_underlying_addr_space != unw_local_addr_space) { - unw_destroy_addr_space(process->unw_underlying_addr_space); - _UPT_destroy(process->unw_underlying_context); - } - process->unw_underlying_context = NULL; - process->unw_underlying_addr_space = NULL; - - unw_destroy_addr_space(process->unw_addr_space); - process->unw_addr_space = NULL; - - process->cache_flags = MC_PROCESS_CACHE_FLAG_NONE; - - free(process->heap); - process->heap = NULL; - - free(process->heap_info); - process->heap_info = NULL; - - if (process->clear_refs_fd_ >= 0) - close(process->clear_refs_fd_); - if (process->pagemap_fd_ >= 0) - close(process->pagemap_fd_); + unw_destroy_addr_space(this->unw_addr_space); } /** 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() { - xbt_assert(mc_mode == MC_MODE_SERVER); // Read/dereference/refresh the std_heap pointer: - if (!this->heap) { - this->heap = (struct mdesc*) malloc(sizeof(struct mdesc)); - } - this->read_bytes(this->heap, sizeof(struct mdesc), remote(this->heap_address), - simgrid::mc::ProcessIndexDisabled); - this->cache_flags |= MC_PROCESS_CACHE_FLAG_HEAP; + if (!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); + this->cache_flags_ |= Process::cache_heap; } /** Refresh the information about the process @@ -310,16 +261,15 @@ void Process::refresh_heap() * */ void Process::refresh_malloc_info() { - xbt_assert(mc_mode == MC_MODE_SERVER); - if (!(this->cache_flags & MC_PROCESS_CACHE_FLAG_HEAP)) - this->refresh_heap(); // Refresh process->heapinfo: - size_t malloc_info_bytesize = - (this->heap->heaplimit + 1) * sizeof(malloc_info); - this->heap_info = (malloc_info*) realloc(this->heap_info, malloc_info_bytesize); - this->read_bytes(this->heap_info, malloc_info_bytesize, + if (this->cache_flags_ & Process::cache_malloc) + return; + size_t count = this->heap->heaplimit + 1; + if (this->heap_info.size() < count) + this->heap_info.resize(count); + this->read_bytes(this->heap_info.data(), count * sizeof(malloc_info), remote(this->heap->heapinfo), simgrid::mc::ProcessIndexDisabled); - this->cache_flags |= MC_PROCESS_CACHE_FLAG_MALLOC_INFO; + this->cache_flags_ |= Process::cache_malloc; } /** @brief Finds the range of the different memory segments and binary paths */ @@ -329,27 +279,27 @@ void Process::init_memory_map_info() this->maestro_stack_start_ = nullptr; this->maestro_stack_end_ = nullptr; this->object_infos.resize(0); - this->binary_info = NULL; - this->libsimgrid_info = NULL; + this->binary_info = nullptr; + this->libsimgrid_info = nullptr; struct s_mc_memory_map_re res; if(regcomp(&res.so_re, SO_RE, 0) || regcomp(&res.version_re, VERSION_RE, 0)) xbt_die(".so regexp did not compile"); - std::vector const& maps = this->memory_map_; + std::vector const& maps = this->memory_map_; - const char* current_name = NULL; + const char* current_name = nullptr; - this->object_infos.resize(0); + this->object_infos.clear(); for (size_t i=0; i < maps.size(); i++) { - simgrid::mc::VmMap const& reg = maps[i]; + simgrid::xbt::VmMap const& reg = maps[i]; const char* pathname = maps[i].pathname.c_str(); // Nothing to do if (maps[i].pathname.empty()) { - current_name = NULL; + current_name = nullptr; continue; } @@ -359,7 +309,7 @@ void Process::init_memory_map_info() this->maestro_stack_start_ = remote(reg.start_addr); this->maestro_stack_end_ = remote(reg.end_addr); } - current_name = NULL; + current_name = nullptr; continue; } @@ -371,23 +321,23 @@ void Process::init_memory_map_info() continue; const bool is_executable = !i; - char* libname = NULL; + char* libname = nullptr; if (!is_executable) { - libname = MC_get_lib_name(pathname, &res); + libname = get_lib_name(pathname, &res); if(!libname) continue; - if (MC_is_filtered_lib(libname)) { + if (is_filtered_lib(libname)) { free(libname); continue; } } std::shared_ptr info = - MC_find_object_info(this->memory_map_, pathname); + simgrid::mc::createObjectInformation(this->memory_map_, pathname); this->object_infos.push_back(info); if (is_executable) this->binary_info = info; - else if (libname && MC_is_simgrid_lib(libname)) + else if (libname && is_simgrid_lib(libname)) this->libsimgrid_info = info; free(libname); } @@ -395,9 +345,9 @@ 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) - MC_post_process_object_info(this, object_info.get()); + postProcessObjectInformation(this, object_info.get()); xbt_assert(this->maestro_stack_start_, "Did not find maestro_stack_start"); xbt_assert(this->maestro_stack_end_, "Did not find maestro_stack_end"); @@ -405,53 +355,47 @@ void Process::init_memory_map_info() XBT_DEBUG("Get debug information done !"); } -std::shared_ptr Process::find_object_info(remote_ptr addr) const +std::shared_ptr Process::find_object_info(RemotePtr addr) const { - for (auto const& object_info : this->object_infos) { + for (auto const& object_info : this->object_infos) if (addr.address() >= (std::uint64_t)object_info->start - && addr.address() <= (std::uint64_t)object_info->end) { + && addr.address() <= (std::uint64_t)object_info->end) return object_info; - } - } - return NULL; + return nullptr; } -std::shared_ptr Process::find_object_info_exec(remote_ptr addr) const +std::shared_ptr Process::find_object_info_exec(RemotePtr addr) const { - for (std::shared_ptr const& info : this->object_infos) { + for (std::shared_ptr const& info : this->object_infos) if (addr.address() >= (std::uint64_t) info->start_exec - && addr.address() <= (std::uint64_t) info->end_exec) { + && addr.address() <= (std::uint64_t) info->end_exec) return info; - } - } return nullptr; } -std::shared_ptr Process::find_object_info_rw(remote_ptr addr) const +std::shared_ptr Process::find_object_info_rw(RemotePtr addr) const { - for (std::shared_ptr const& info : this->object_infos) { + for (std::shared_ptr const& info : this->object_infos) if (addr.address() >= (std::uint64_t)info->start_rw - && addr.address() <= (std::uint64_t)info->end_rw) { + && addr.address() <= (std::uint64_t)info->end_rw) return info; - } - } return nullptr; } -simgrid::mc::Frame* Process::find_function(remote_ptr ip) const +simgrid::mc::Frame* Process::find_function(RemotePtr ip) const { std::shared_ptr info = this->find_object_info_exec(ip); 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); @@ -465,7 +409,7 @@ simgrid::mc::Variable* Process::find_variable(const char* name) const return var; } - return NULL; + return nullptr; } void Process::read_variable(const char* name, void* target, size_t size) const @@ -481,17 +425,17 @@ void Process::read_variable(const char* name, void* target, size_t size) const this->read_bytes(target, size, remote(var->address)); } -char* Process::read_string(remote_ptr address) const +std::string Process::read_string(RemotePtr address) const { if (!address) - return NULL; + 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; @@ -501,28 +445,26 @@ char* Process::read_string(remote_ptr 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); } } const void *Process::read_bytes(void* buffer, std::size_t size, - remote_ptr address, int process_index, - AddressSpace::ReadMode mode) const + RemotePtr address, int process_index, + ReadOptions options) const { if (process_index != simgrid::mc::ProcessIndexDisabled) { std::shared_ptr const& info = this->find_object_info_rw((void*)address.address()); // Segment overlap is not handled. -#ifdef HAVE_SMPI - if (info.get() && info.get()->privatized()) { +#if HAVE_SMPI + if (info.get() && this->privatized(*info)) { if (process_index < 0) xbt_die("Missing process index"); if (process_index >= (int) MC_smpi_process_count()) @@ -537,7 +479,7 @@ 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); } @@ -556,15 +498,15 @@ const void *Process::read_bytes(void* buffer, std::size_t size, * @param remote target process memory address (target) * @param len data size */ -void Process::write_bytes(const void* buffer, size_t len, remote_ptr address) +void Process::write_bytes(const void* buffer, size_t len, RemotePtr address) { if (pwrite_whole(this->memory_file, buffer, len, address.address()) < 0) xbt_die("Write to process %lli failed", (long long) this->pid_); } -void Process::clear_bytes(remote_ptr address, size_t len) +void Process::clear_bytes(RemotePtr address, size_t len) { - pthread_once(&zero_buffer_flag, MC_zero_buffer_init); + pthread_once(&zero_buffer_flag, zero_buffer_init); while (len) { size_t s = len > zero_buffer_size ? zero_buffer_size : len; this->write_bytes(zero_buffer, s, address); @@ -607,42 +549,129 @@ void Process::ignore_region(std::uint64_t addr, std::size_t size) std::size_t position; if (current_region->addr == addr) { - if (current_region->size < size) { + if (current_region->size < size) position = cursor + 1; - } else { + else position = cursor; - } - } else if (current_region->addr < addr) { + } else if (current_region->addr < addr) position = cursor + 1; - } else { + else position = cursor; - } ignored_regions_.insert( ignored_regions_.begin() + position, region); } -void Process::reset_soft_dirty() +void Process::ignore_heap(IgnoredHeapRegion const& region) +{ + if (ignored_heap_.empty()) { + ignored_heap_.push_back(std::move(region)); + return; + } + + typedef std::vector::size_type size_type; + + size_type start = 0; + size_type end = ignored_heap_.size() - 1; + + // Binary search the position of insertion: + size_type cursor; + while (start <= end) { + cursor = start + (end - start) / 2; + auto& current_region = ignored_heap_[cursor]; + if (current_region.address == region.address) + return; + else if (current_region.address < region.address) + start = cursor + 1; + else if (cursor != 0) + end = cursor - 1; + // Avoid underflow: + else + break; + } + + // Insert it mc_heap_ignore_region_t: + if (ignored_heap_[cursor].address < region.address) + ++cursor; + ignored_heap_.insert( ignored_heap_.begin() + cursor, region); +} + +void Process::unignore_heap(void *address, size_t size) { - 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?"); + typedef std::vector::size_type size_type; + + size_type start = 0; + size_type end = ignored_heap_.size() - 1; + + // Binary search: + size_type cursor; + while (start <= end) { + cursor = (start + end) / 2; + auto& region = ignored_heap_[cursor]; + if (region.address == address) { + ignored_heap_.erase(ignored_heap_.begin() + cursor); + return; + } else if (region.address < address) + start = cursor + 1; + else if ((char *) region.address <= ((char *) address + size)) { + ignored_heap_.erase(ignored_heap_.begin() + cursor); + return; + } else if (cursor != 0) + end = cursor - 1; + // Avoid underflow: + else + break; } - 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) +void Process::ignore_local_variable(const char *var_name, const char *frame_name) +{ + if (frame_name != nullptr && strcmp(frame_name, "*") == 0) + frame_name = nullptr; + for (std::shared_ptr const& info : + this->object_infos) + info->remove_local_variable(var_name, frame_name); +} + +std::vector& Process::simix_processes() +{ + this->refresh_simix(); + return smx_process_infos; +} + +std::vector& Process::old_simix_processes() +{ + this->refresh_simix(); + return smx_old_process_infos; +} + +void Process::dumpStack() { - 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?"); + 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; } - 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"); + + 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; } }