X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/fe503dfa41c532a17a4fc3f6b244e72e7783d386..f734ec7475682eb90323e804cbcfddd7e4523992:/src/mc/mc_unw.hpp

diff --git a/src/mc/mc_unw.hpp b/src/mc/mc_unw.hpp
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+/* Copyright (c) 2015-2017. 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. */
+
+#ifndef SIMGRID_MC_UNW_HPP
+#define SIMGRID_MC_UNW_HPP
+
+/** @file
+ *  Libunwind implementation for the model-checker
+ *
+ *  Libunwind provides an pluggable stack unwinding API: the way the current
+ *  registers and memory is accessed, the way unwinding informations is found
+ *  is pluggable.
+ *
+ *  This component implements the libunwind API for he model-checker:
+ *
+ *    * reading memory from a simgrid::mc::AddressSpace*;
+ *
+ *    * reading stack registers from a saved snapshot (context).
+ *
+ *  Parts of the libunwind information fetching is currently handled by the
+ *  standard `libunwind` implementations (either the local one or the ptrace one)
+ *  because parsing `.eh_frame` section is not fun and `libdw` does not help
+ *  much here.
+ */
+
+#include "src/mc/mc_forward.hpp"
+#include "xbt/base.h"
+
+#include <libunwind.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+namespace simgrid {
+namespace unw {
+
+XBT_PRIVATE unw_addr_space_t create_addr_space();
+XBT_PRIVATE void* create_context(unw_addr_space_t as, pid_t pid);
+
+}
+}
+
+namespace simgrid {
+namespace mc {
+
+class UnwindContext {
+  simgrid::mc::AddressSpace* addressSpace_ = nullptr;
+  simgrid::mc::RemoteClient* process_      = nullptr;
+  unw_context_t unwindContext_;
+
+public:
+  UnwindContext() = default;
+  ~UnwindContext() { clear(); }
+  void initialize(simgrid::mc::RemoteClient* process, unw_context_t* c);
+  void clear();
+  unw_cursor_t cursor();
+
+private: // Methods and virtual table for libunwind
+  static int find_proc_info(unw_addr_space_t as,
+                unw_word_t ip, unw_proc_info_t *pip,
+                int need_unwind_info, void* arg) noexcept;
+  static void put_unwind_info(unw_addr_space_t as,
+                unw_proc_info_t *pip, void* arg) noexcept;
+  static int get_dyn_info_list_addr(unw_addr_space_t as,
+                unw_word_t *dilap, void* arg) noexcept;
+  static int access_mem(unw_addr_space_t as,
+                unw_word_t addr, unw_word_t *valp,
+                int write, void* arg) noexcept;
+  static void* get_reg(unw_context_t* context, unw_regnum_t regnum) noexcept;
+  static int access_reg(unw_addr_space_t as,
+                unw_regnum_t regnum, unw_word_t *valp,
+                int write, void* arg) noexcept;
+  static int access_fpreg(unw_addr_space_t as,
+                unw_regnum_t regnum, unw_fpreg_t *fpvalp,
+                int write, void* arg) noexcept;
+  static int resume(unw_addr_space_t as,
+                unw_cursor_t *cp, void* arg) noexcept;
+  static int get_proc_name(unw_addr_space_t as,
+                unw_word_t addr, char *bufp,
+                size_t buf_len, unw_word_t *offp,
+                void* arg) noexcept;
+  static unw_accessors_t accessors;
+public:
+  // Create a libunwind address space:
+  static unw_addr_space_t createUnwindAddressSpace();
+};
+
+void MC_dump_stack_unw(FILE* file, unw_cursor_t cursor);
+void dumpStack(FILE* file, unw_cursor_t cursor);
+void dumpStack(FILE* file, pid_t pid);
+
+}
+}
+
+#endif