#include <assert.h>
#include <stddef.h>
-#include <stdbool.h>
#include <stdint.h>
#include <errno.h>
+#include <sys/ptrace.h>
+
+#include <cstdio>
+
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <libunwind.h>
#include <libunwind-ptrace.h>
+#include <xbt/log.h>
+#include <xbt/base.h>
#include <xbt/mmalloc.h>
-#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",
"libelf",
"libgcc_s",
"liblua5.1",
+ "liblua5.3",
"liblzma",
"libm",
"libpthread",
"librt",
- "libsigc",
"libstdc++",
"libunwind",
"libunwind-x86_64",
"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;
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)) {
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;
}
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;
}
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;
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<s_xbt_mheap_t>(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
* */
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 */
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<simgrid::mc::VmMap> const& maps = this->memory_map_;
+ std::vector<simgrid::xbt::VmMap> 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;
}
this->maestro_stack_start_ = remote(reg.start_addr);
this->maestro_stack_end_ = remote(reg.end_addr);
}
- current_name = NULL;
+ current_name = nullptr;
continue;
}
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<simgrid::mc::ObjectInformation> info =
- MC_find_object_info(this->memory_map_, pathname, is_executable);
+ 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);
}
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");
XBT_DEBUG("Get debug information done !");
}
-std::shared_ptr<simgrid::mc::ObjectInformation> Process::find_object_info(remote_ptr<void> addr) const
+std::shared_ptr<simgrid::mc::ObjectInformation> Process::find_object_info(RemotePtr<void> 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<ObjectInformation> Process::find_object_info_exec(remote_ptr<void> addr) const
+std::shared_ptr<ObjectInformation> Process::find_object_info_exec(RemotePtr<void> addr) const
{
- for (std::shared_ptr<ObjectInformation> const& info : this->object_infos) {
+ for (std::shared_ptr<ObjectInformation> 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<ObjectInformation> Process::find_object_info_rw(remote_ptr<void> addr) const
+std::shared_ptr<ObjectInformation> Process::find_object_info_rw(RemotePtr<void> addr) const
{
- for (std::shared_ptr<ObjectInformation> const& info : this->object_infos) {
+ for (std::shared_ptr<ObjectInformation> 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<void> ip) const
+simgrid::mc::Frame* Process::find_function(RemotePtr<void> ip) const
{
std::shared_ptr<simgrid::mc::ObjectInformation> 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<simgrid::mc::ObjectInformation> const& info = this->binary_info;
simgrid::mc::Variable* var = info->find_variable(name);
return var;
}
- return NULL;
+ return nullptr;
}
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<void> address) const
+std::string Process::read_string(RemotePtr<char> 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<char> 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;
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<void> address, int process_index,
- AddressSpace::ReadMode mode) const
+ RemotePtr<void> address, int process_index,
+ ReadOptions options) const
{
if (process_index != simgrid::mc::ProcessIndexDisabled) {
std::shared_ptr<simgrid::mc::ObjectInformation> 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())
mc_model_checker->process().read<s_smpi_privatisation_region_t>(
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);
}
* @param remote target process memory address (target)
* @param len data size
*/
-void Process::write_bytes(const void* buffer, size_t len, remote_ptr<void> address)
+void Process::write_bytes(const void* buffer, size_t len, RemotePtr<void> 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<void> address, size_t len)
+void Process::clear_bytes(RemotePtr<void> 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);
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<IgnoredHeapRegion>::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<IgnoredHeapRegion>::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<simgrid::mc::ObjectInformation> const& info :
+ this->object_infos)
+ info->remove_local_variable(var_name, frame_name);
+}
+
+std::vector<simgrid::mc::SimixProcessInformation>& Process::simix_processes()
+{
+ this->refresh_simix();
+ return smx_process_infos;
+}
+
+std::vector<simgrid::mc::SimixProcessInformation>& 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;
}
}
