Update copyright lines with new year.

[simgrid.git] / src / mc / inspect / mc_unw.cpp

diff --git a/src/mc/inspect/mc_unw.cpp b/src/mc/inspect/mc_unw.cpp
index da2a9d7..a51a8fb 100644 (file)
--- a/src/mc/inspect/mc_unw.cpp
+++ b/src/mc/inspect/mc_unw.cpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2019. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2015-2020. 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. */
@@ -39,7 +39,7 @@ namespace mc {
 int UnwindContext::find_proc_info(unw_addr_space_t /*as*/, unw_word_t ip, unw_proc_info_t* pip, int need_unwind_info,
                                   void* arg) noexcept
 {
-  simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
+  const simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
   return unw_get_accessors(context->process_->unw_underlying_addr_space)
       ->find_proc_info(context->process_->unw_underlying_addr_space, ip, pip, need_unwind_info,
                        context->process_->unw_underlying_context);
@@ -51,7 +51,7 @@ int UnwindContext::find_proc_info(unw_addr_space_t /*as*/, unw_word_t ip, unw_pr
  */
 void UnwindContext::put_unwind_info(unw_addr_space_t /*as*/, unw_proc_info_t* pip, void* arg) noexcept
 {
-  simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
+  const simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
   return unw_get_accessors(context->process_->unw_underlying_addr_space)
       ->put_unwind_info(context->process_->unw_underlying_addr_space, pip, context->process_->unw_underlying_context);
 }
@@ -62,7 +62,7 @@ void UnwindContext::put_unwind_info(unw_addr_space_t /*as*/, unw_proc_info_t* pi
  */
 int UnwindContext::get_dyn_info_list_addr(unw_addr_space_t /*as*/, unw_word_t* dilap, void* arg) noexcept
 {
-  simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
+  const simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
   return unw_get_accessors(context->process_->unw_underlying_addr_space)
       ->get_dyn_info_list_addr(context->process_->unw_underlying_addr_space, dilap,
                                context->process_->unw_underlying_context);
@@ -74,7 +74,7 @@ int UnwindContext::get_dyn_info_list_addr(unw_addr_space_t /*as*/, unw_word_t* d
  */
 int UnwindContext::access_mem(unw_addr_space_t /*as*/, unw_word_t addr, unw_word_t* valp, int write, void* arg) noexcept
 {
-  simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
+  const simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
   if (write)
     return -UNW_EREADONLYREG;
   context->address_space_->read_bytes(valp, sizeof(unw_word_t), remote(addr));
@@ -176,41 +176,20 @@ int UnwindContext::access_reg(unw_addr_space_t /*as*/, unw_regnum_t regnum, unw_
   unw_context_t* context                 = &as_context->unwind_context_;
   if (write)
     return -UNW_EREADONLYREG;
-  greg_t* preg = (greg_t*)get_reg(context, regnum);
+  const greg_t* preg = (greg_t*)get_reg(context, regnum);
   if (not preg)
     return -UNW_EBADREG;
   *valp = *preg;
   return 0;
 }
 
-/** Read a floating-point register (libunwind method)
- *
- *  FP registers are caller-saved. The values saved by functions such as
- *  `getcontext()` is not relevant for the caller. It is not really necessary
- *  to save and handle them.
- */
-int UnwindContext::access_fpreg(unw_addr_space_t /*as*/, unw_regnum_t /*regnum*/, unw_fpreg_t* /*fpvalp*/,
-                                int /*write*/, void* /*arg*/) noexcept
-{
-  return -UNW_EBADREG;
-}
-
-/** Resume the execution of the context (libunwind method)
- *
- * We don't use this.
- */
-int UnwindContext::resume(unw_addr_space_t /*as*/, unw_cursor_t* /*cp*/, void* /*arg*/) noexcept
-{
-  return -UNW_EUNSPEC;
-}
-
 /** Find informations about a function (libunwind method)
  */
 int UnwindContext::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
 {
-  simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
-  simgrid::mc::Frame* frame           = context->process_->find_function(remote(addr));
+  const simgrid::mc::UnwindContext* context = (simgrid::mc::UnwindContext*)arg;
+  const simgrid::mc::Frame* frame           = context->process_->find_function(remote(addr));
   if (not frame)
     return -UNW_ENOINFO;
   *offp = (unw_word_t)frame->range.begin() - addr;
@@ -231,11 +210,13 @@ int UnwindContext::get_proc_name(unw_addr_space_t /*as*/, unw_word_t addr, char*
  *  Stack unwinding on a `simgrid::mc::Process*` (for memory, unwinding information)
  *  and `ucontext_t` (for processor registers).
  *
- *  It works with the `simgrid::mc::UnwindContext` context.
+ * It works with the `simgrid::mc::UnwindContext` context.
+ *
+ * Use nullptr as access_fpreg and resume, as we don't need them.
  */
 unw_accessors_t UnwindContext::accessors = {&find_proc_info, &put_unwind_info, &get_dyn_info_list_addr,
-                                            &access_mem,     &access_reg,      &access_fpreg,
-                                            &resume,         &get_proc_name};
+                                            &access_mem,     &access_reg,      nullptr,
+                                            nullptr,         &get_proc_name};
 
 unw_addr_space_t UnwindContext::createUnwindAddressSpace()
 {
@@ -267,8 +248,9 @@ void UnwindContext::initialize(simgrid::mc::RemoteClient* process, unw_context_t
 unw_cursor_t UnwindContext::cursor()
 {
   unw_cursor_t cursor;
-  if (process_ == nullptr || address_space_ == nullptr || unw_init_remote(&cursor, process_->unw_addr_space, this) != 0)
-    xbt_die("UnwindContext not initialized");
+  xbt_assert(process_ != nullptr && address_space_ != nullptr &&
+                 unw_init_remote(&cursor, process_->unw_addr_space, this) == 0,
+             "UnwindContext not initialized");
   return cursor;
 }