1 files changed, 116 insertions, 0 deletions
diff --git a/bruiser/executioner.h b/bruiser/executioner.h
new file mode 100644
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+++ b/bruiser/executioner.h
@@ -0,0 +1,116 @@
+
+/***************************************************Project Mutator****************************************************/
+//-*-c++-*-
+/*first line intentionally left blank.*/
+/*loads the objects into executable memory and registers them with lua.*/
+/*Copyright (C) 2017 Farzad Sadeghi
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.*/
+/**********************************************************************************************************************/
+#include <iostream>
+#include <tuple>
+#include <vector>
+#include <cstdint>
+#include <cstdarg>
+#include <cstring>
+#include <sys/mman.h>
+#include "lua-5.3.4/src/lua.hpp"
+/**********************************************************************************************************************/
+#ifndef EXECUTIONER_H
+#define EXECUTIONER_H
+/**********************************************************************************************************************/
+namespace {
+  using XObject = void(*)(void);
+  constexpr int MEMORY_SIZE = 32768;
+  std::vector<uint8_t> memory(MEMORY_SIZE, 0);
+
+  void* alloc_writeable_memory(size_t _size) {
+    void* ptr = mmap(0, _size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+    if (ptr == (void*)-1) {
+      perror("could not allocate virtual memory.");
+      return nullptr;
+    }
+    return ptr;
+  }
+
+  int make_mem_executable(void* _mem, size_t _size) {
+    if (mprotect(_mem, _size, PROT_READ | PROT_EXEC) == -1) {
+      perror("could not make virtual memory executable.");
+      return -1;
+    }
+    return 0;
+  }
+}
+
+int getMemorySize(void) {return MEMORY_SIZE;}
+
+class Executioner {
+  public:
+    Executioner() {}
+    ~Executioner() {
+      for (auto &iter : obj_mem_ptrs) {
+        if (iter.first != nullptr) {
+          if (munmap(iter.first, iter.second) < 0) {
+            perror("could not unmap vmemory.");
+          }
+        }
+      }
+    }
+
+    void getObjs(std::vector<std::vector<uint8_t>>& _objs) {objs = _objs;}
+
+    void getNames(std::vector<std::string>& _names) {names = _names;}
+
+    std::pair<void*, size_t> loadObjsInXMem(std::vector<uint8_t>& _obj_code) {
+      size_t code_size = _obj_code.size();
+      void* program_memory = alloc_writeable_memory(code_size);
+      if (program_memory == nullptr) {
+        std::cout << "could not allocate virtual memory\n";
+        return std::make_pair(nullptr, 0);
+      }
+      memcpy(program_memory, _obj_code.data(), code_size);
+      if (make_mem_executable(program_memory, code_size) < 0) {
+        std::cout << "could not make vmemory executable.\n";
+        return std::make_pair(nullptr, 0);
+      }
+      return std::make_pair(program_memory, code_size);
+    }
+
+    void loadAll(void) {
+      for (auto &iter : objs) {
+        this->loadObjsInXMem(iter);
+      }
+    }
+
+    void emitByte(uint8_t _byte, std::vector<uint8_t>& _code) {
+      _code.push_back(_byte);
+    }
+
+    void emitBytes(std::vector<uint8_t>& _bytes, std::vector<uint8_t>& _code) {
+      for (auto &iter : _bytes) {this->emitByte(iter, _code);}
+    }
+
+    void registerWithLua(lua_State* _lua_State) {}
+
+  private:
+    std::vector<std::pair<void*, size_t>> obj_mem_ptrs;
+    std::vector<std::vector<uint8_t>> objs;
+    std::vector<std::string> names;
+};
+/**********************************************************************************************************************/
+#endif
+/**********************************************************************************************************************/
+/*last line intentionally left blank.*/
+