X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/8173f52406580284c8ec5feab41784a8f4aed8ce..85861efad8a0c75dfc4cca06c3f8adcf86d49495:/src/mc/AddressSpace.hpp

diff --git a/src/mc/AddressSpace.hpp b/src/mc/AddressSpace.hpp
index 07f18df8a7..e9d152c484 100644
--- a/src/mc/AddressSpace.hpp
+++ b/src/mc/AddressSpace.hpp
@@ -1,59 +1,137 @@
-/* Copyright (c) 2008-2014. The SimGrid Team.
- * All rights reserved.                                                     */
+/* Copyright (c) 2008-2021. 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 MC_ADDRESS_SPACE_H
-#define MC_ADDRESS_SPACE_H
+#ifndef SIMGRID_MC_ADDRESS_SPACE_H
+#define SIMGRID_MC_ADDRESS_SPACE_H
 
-#include <cstdint>
-#include <type_traits>
-
-#include <xbt/misc.h>
-
-#include <stdint.h>
-
-#include "mc_forward.h"
+#include "src/mc/mc_forward.hpp"
+#include "src/mc/remote/RemotePtr.hpp"
 
 namespace simgrid {
 namespace mc {
 
-/** Process index used when no process is available
+/** Options for read operations
  *
- *  The expected behaviour is that if a process index is needed it will fail.
- * */
-const int ProcessIndexMissing = -1;
+ *  This is a set of flags managed with bitwise operators. Only the
+ *  meaningful operations are defined: addition, conversions to/from
+ *  integers are not allowed.
+ */
+class ReadOptions {
+  std::uint32_t value_ = 0;
+  constexpr explicit ReadOptions(std::uint32_t value) : value_(value) {}
+
+public:
+  constexpr ReadOptions() = default;
 
-/** Process index used when we don't care about the process index
- * */
-const int ProcessIndexDisabled = -2;
+  explicit constexpr operator bool() const { return value_ != 0; }
+  constexpr bool operator!() const { return value_ == 0; }
 
-/** Constant used when any process will do.
+  constexpr ReadOptions operator|(ReadOptions const& that) const
+  {
+    return ReadOptions(value_ | that.value_);
+  }
+  constexpr ReadOptions operator&(ReadOptions const& that) const
+  {
+    return ReadOptions(value_ & that.value_);
+  }
+  constexpr ReadOptions operator^(ReadOptions const& that) const
+  {
+    return ReadOptions(value_ ^ that.value_);
+  }
+  constexpr ReadOptions operator~() const
+  {
+    return ReadOptions(~value_);
+  }
+
+  ReadOptions& operator|=(ReadOptions const& that)
+  {
+    value_ |= that.value_;
+    return *this;
+  }
+  ReadOptions& operator&=(ReadOptions const& that)
+  {
+    value_ &= that.value_;
+    return *this;
+  }
+  ReadOptions& operator^=(ReadOptions const& that)
+  {
+    value_ ^= that.value_;
+    return *this;
+  }
+
+  /** Copy the data to the given buffer */
+  static constexpr ReadOptions none() { return ReadOptions(0); }
+
+  /** Allows to return a pointer to another buffer where the data is
+   *  available instead of copying the data into the buffer
+   */
+  static constexpr ReadOptions lazy() { return ReadOptions(1); }
+};
+
+/** A given state of a given process (abstract base class)
+ *
+ *  Currently, this might either be:
  *
- *  This is is index of the first process.
+ *  * the current state of an existing process;
+ *
+ *  * a snapshot.
+ *
+ *  In order to support SMPI privatization, the can read the memory from the
+ *  context of a given SMPI process: if specified, the code reads data from the
+ *  correct SMPI privatization VMA.
  */
-const int ProcessIndexAny = 0;
-
 class AddressSpace {
+private:
+  RemoteProcess* remote_process_;
+
 public:
-  enum ReadMode {
-    Normal,
-    /** Allows the `read_bytes` to return a pointer to another buffer
-     *  where the data ins available instead of copying the data into the buffer
-     */
-    Lazy
-  };
-  virtual ~AddressSpace();
-  virtual const void* read_bytes(void* buffer, std::size_t size,
-    std::uint64_t address, int process_index = ProcessIndexAny,
-    ReadMode mode = Normal) = 0;
-  template<class T>
-  T read(uint64_t address, int process_index = ProcessIndexMissing)
-  {
-    static_assert(std::is_trivial<T>::value, "Cannot read a non-trivial type");
-    T res;
-    return *(T*)this->read_bytes(&res, sizeof(T), address, process_index);
+  explicit AddressSpace(RemoteProcess* process) : remote_process_(process) {}
+  virtual ~AddressSpace() = default;
+
+  /** The process of this address space
+   *
+   *  This is where we can get debug information, memory layout, etc.
+   */
+  simgrid::mc::RemoteProcess* get_remote_process() const { return remote_process_; }
+
+  /** Read data from the address space
+   *
+   *  @param buffer        target buffer for the data
+   *  @param size          number of bytes to read
+   *  @param address       remote source address of the data
+   *  @param options
+   */
+  virtual void* read_bytes(void* buffer, std::size_t size, RemotePtr<void> address,
+                           ReadOptions options = ReadOptions::none()) const = 0;
+
+  /** Read a given data structure from the address space */
+  template <class T> inline void read(T* buffer, RemotePtr<T> ptr) const { this->read_bytes(buffer, sizeof(T), ptr); }
+
+  template <class T> inline void read(Remote<T>& buffer, RemotePtr<T> ptr) const
+  {
+    this->read_bytes(buffer.get_buffer(), sizeof(T), ptr);
+  }
+
+  /** Read a given data structure from the address space
+   *
+   *  This version returns by value.
+   */
+  template <class T> inline Remote<T> read(RemotePtr<T> ptr) const
+  {
+    Remote<T> res;
+    this->read_bytes(&res, sizeof(T), ptr);
+    return res;
+  }
+
+  /** Read a string of known size */
+  std::string read_string(RemotePtr<char> address, std::size_t len) const
+  {
+    std::string res;
+    res.resize(len);
+    this->read_bytes(&res[0], len, address);
+    return res;
   }
 };