Moving SectionMemoryManager into RuntimeDyld and adding unit tests for it.

The SectionMemoryManager now supports (and requires) applying section-specific page permissions.  Clients using this memory manager must call either MCJIT::finalizeObject() or SectionMemoryManager::applyPermissions() before executing JITed code.

See r168718 for changes from the previous implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168721 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 175 insertions, 406 deletions

diff --git a/unittests/ExecutionEngine/MCJIT/CMakeLists.txt b/unittests/ExecutionEngine/MCJIT/CMakeLists.txt
index 3e9c5b631e..c6b1f77e3e 100644
--- a/unittests/ExecutionEngine/MCJIT/CMakeLists.txt
+++ b/unittests/ExecutionEngine/MCJIT/CMakeLists.txt
@@ -2,14 +2,14 @@ set(LLVM_LINK_COMPONENTS
   asmparser
   bitreader
   bitwriter
-  mcjit
   jit
+  mcjit
   nativecodegen
   )
 
 set(MCJITTestsSources
   MCJITTest.cpp
-  SectionMemoryManager.cpp
+  MCJITMemoryManagerTest.cpp
   )
 
 if(MSVC)
diff --git a/unittests/ExecutionEngine/MCJIT/MCJITMemoryManagerTest.cpp b/unittests/ExecutionEngine/MCJIT/MCJITMemoryManagerTest.cpp
new file mode 100644
index 0000000000..eeea9d7652
--- /dev/null
+++ b/unittests/ExecutionEngine/MCJIT/MCJITMemoryManagerTest.cpp
@@ -0,0 +1,172 @@
+//===- MCJITMemoryManagerTest.cpp - Unit tests for the JIT memory manager -===//

+//

+//                     The LLVM Compiler Infrastructure

+//

+// This file is distributed under the University of Illinois Open Source

+// License. See LICENSE.TXT for details.

+//

+//===----------------------------------------------------------------------===//

+

+#include "gtest/gtest.h"

+#include "llvm/ADT/OwningPtr.h"

+#include "llvm/ExecutionEngine/SectionMemoryManager.h"

+#include "llvm/ExecutionEngine/JIT.h"

+

+using namespace llvm;

+

+namespace {

+

+TEST(MCJITMemoryManagerTest, BasicAllocations) {

+  OwningPtr<SectionMemoryManager> MemMgr(new SectionMemoryManager());

+

+  uint8_t *code1 = MemMgr->allocateCodeSection(256, 0, 1);

+  uint8_t *data1 = MemMgr->allocateDataSection(256, 0, 2, true);

+  uint8_t *code2 = MemMgr->allocateCodeSection(256, 0, 3);

+  uint8_t *data2 = MemMgr->allocateDataSection(256, 0, 4, false);

+

+  EXPECT_NE((uint8_t*)0, code1);

+  EXPECT_NE((uint8_t*)0, code2);

+  EXPECT_NE((uint8_t*)0, data1);

+  EXPECT_NE((uint8_t*)0, data2);

+

+  // Initialize the data

+  for (unsigned i = 0; i < 256; ++i) {

+    code1[i] = 1;

+    code2[i] = 2;

+    data1[i] = 3;

+    data2[i] = 4;

+  }

+

+  // Verify the data (this is checking for overlaps in the addresses)

+  for (unsigned i = 0; i < 256; ++i) {

+    EXPECT_EQ(1, code1[i]);

+    EXPECT_EQ(2, code2[i]);

+    EXPECT_EQ(3, data1[i]);

+    EXPECT_EQ(4, data2[i]);

+  }

+

+  std::string Error;

+  EXPECT_FALSE(MemMgr->applyPermissions(&Error));

+}

+

+TEST(MCJITMemoryManagerTest, LargeAllocations) {

+  OwningPtr<SectionMemoryManager> MemMgr(new SectionMemoryManager());

+

+  uint8_t *code1 = MemMgr->allocateCodeSection(0x100000, 0, 1);

+  uint8_t *data1 = MemMgr->allocateDataSection(0x100000, 0, 2, true);

+  uint8_t *code2 = MemMgr->allocateCodeSection(0x100000, 0, 3);

+  uint8_t *data2 = MemMgr->allocateDataSection(0x100000, 0, 4, false);

+

+  EXPECT_NE((uint8_t*)0, code1);

+  EXPECT_NE((uint8_t*)0, code2);

+  EXPECT_NE((uint8_t*)0, data1);

+  EXPECT_NE((uint8_t*)0, data2);

+

+  // Initialize the data

+  for (unsigned i = 0; i < 0x100000; ++i) {

+    code1[i] = 1;

+    code2[i] = 2;

+    data1[i] = 3;

+    data2[i] = 4;

+  }

+

+  // Verify the data (this is checking for overlaps in the addresses)

+  for (unsigned i = 0; i < 0x100000; ++i) {

+    EXPECT_EQ(1, code1[i]);

+    EXPECT_EQ(2, code2[i]);

+    EXPECT_EQ(3, data1[i]);

+    EXPECT_EQ(4, data2[i]);

+  }

+

+  std::string Error;

+  EXPECT_FALSE(MemMgr->applyPermissions(&Error));

+}

+

+TEST(MCJITMemoryManagerTest, ManyAllocations) {

+  OwningPtr<SectionMemoryManager> MemMgr(new SectionMemoryManager());

+

+  uint8_t* code[10000];

+  uint8_t* data[10000];

+

+  for (unsigned i = 0; i < 10000; ++i) {

+    const bool isReadOnly = i % 2 == 0;

+

+    code[i] = MemMgr->allocateCodeSection(32, 0, 1);

+    data[i] = MemMgr->allocateDataSection(32, 0, 2, isReadOnly);

+

+    for (unsigned j = 0; j < 32; j++) {

+      code[i][j] = 1 + (i % 254);

+      data[i][j] = 2 + (i % 254);

+    }

+

+    EXPECT_NE((uint8_t *)0, code[i]);

+    EXPECT_NE((uint8_t *)0, data[i]);

+  }

+

+  // Verify the data (this is checking for overlaps in the addresses)

+  for (unsigned i = 0; i < 10000; ++i) {

+    for (unsigned j = 0; j < 32;j++ ) {

+      uint8_t ExpectedCode = 1 + (i % 254);

+      uint8_t ExpectedData = 2 + (i % 254);

+      EXPECT_EQ(ExpectedCode, code[i][j]);

+      EXPECT_EQ(ExpectedData, data[i][j]);

+    }

+  }

+

+  std::string Error;

+  EXPECT_FALSE(MemMgr->applyPermissions(&Error));

+}

+

+TEST(MCJITMemoryManagerTest, ManyVariedAllocations) {

+  OwningPtr<SectionMemoryManager> MemMgr(new SectionMemoryManager());

+

+  uint8_t* code[10000];

+  uint8_t* data[10000];

+

+  for (unsigned i = 0; i < 10000; ++i) {

+    uintptr_t CodeSize = i % 16 + 1;

+    uintptr_t DataSize = i % 8 + 1;

+

+    bool isReadOnly = i % 3 == 0;

+    unsigned Align = 8 << (i % 4);

+

+    code[i] = MemMgr->allocateCodeSection(CodeSize, Align, i);

+    data[i] = MemMgr->allocateDataSection(DataSize, Align, i + 10000,

+                                          isReadOnly);

+

+    for (unsigned j = 0; j < CodeSize; j++) {

+      code[i][j] = 1 + (i % 254);

+    }

+

+    for (unsigned j = 0; j < DataSize; j++) {

+      data[i][j] = 2 + (i % 254);

+    }

+

+    EXPECT_NE((uint8_t *)0, code[i]);

+    EXPECT_NE((uint8_t *)0, data[i]);

+

+    uintptr_t CodeAlign = Align ? (uintptr_t)code[i] % Align : 0;

+    uintptr_t DataAlign = Align ? (uintptr_t)data[i] % Align : 0;

+

+    EXPECT_EQ((uintptr_t)0, CodeAlign);

+    EXPECT_EQ((uintptr_t)0, DataAlign);

+  }

+

+  for (unsigned i = 0; i < 10000; ++i) {

+    uintptr_t CodeSize = i % 16 + 1;

+    uintptr_t DataSize = i % 8 + 1;

+

+    for (unsigned j = 0; j < CodeSize; j++) {

+      uint8_t ExpectedCode = 1 + (i % 254);

+      EXPECT_EQ(ExpectedCode, code[i][j]);

+    }

+

+    for (unsigned j = 0; j < DataSize; j++) {

+      uint8_t ExpectedData = 2 + (i % 254);

+      EXPECT_EQ(ExpectedData, data[i][j]); 

+    }

+  }

+}

+

+} // Namespace

+

diff --git a/unittests/ExecutionEngine/MCJIT/MCJITTestBase.h b/unittests/ExecutionEngine/MCJIT/MCJITTestBase.h
index 9b4a4ac3cf..e34074b2e0 100644
--- a/unittests/ExecutionEngine/MCJIT/MCJITTestBase.h
+++ b/unittests/ExecutionEngine/MCJIT/MCJITTestBase.h
@@ -21,6 +21,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/Config/config.h"
 #include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ExecutionEngine/SectionMemoryManager.h"
 #include "llvm/Function.h"
 #include "llvm/IRBuilder.h"
 #include "llvm/LLVMContext.h"
@@ -30,8 +31,6 @@
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/TypeBuilder.h"
 
-#include "SectionMemoryManager.h"
-
 // Used to skip tests on unsupported architectures and operating systems.
 // To skip a test, add this macro at the top of a test-case in a suite that
 // inherits from MCJITTestBase. See MCJITTest.cpp for examples.
diff --git a/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp b/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp
deleted file mode 100644
index e8aaa82a5f..0000000000
--- a/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp
+++ /dev/null
@@ -1,226 +0,0 @@
-//===- SectionMemoryManager.cpp - Memory manager for MCJIT/RtDyld *- C++ -*-==//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the section-based memory manager used by the MCJIT
-// execution engine and RuntimeDyld
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Config/config.h"
-#include "llvm/Support/DynamicLibrary.h"
-#include "llvm/Support/MathExtras.h"
-#include "SectionMemoryManager.h"
-
-#ifdef __linux__
-  // These includes used by SectionMemoryManager::getPointerToNamedFunction()
-  // for Glibc trickery. See comments in this function for more information.
-  #ifdef HAVE_SYS_STAT_H
-    #include <sys/stat.h>
-  #endif
-  #include <fcntl.h>
-  #include <unistd.h>
-#endif
-
-namespace llvm {
-
-uint8_t *SectionMemoryManager::allocateDataSection(uintptr_t Size,
-                                                    unsigned Alignment,
-                                                    unsigned SectionID,
-                                                    bool IsReadOnly) {
-  if (IsReadOnly)
-    return allocateSection(RODataMem, Size, Alignment);
-  return allocateSection(RWDataMem, Size, Alignment);
-}
-
-uint8_t *SectionMemoryManager::allocateCodeSection(uintptr_t Size,
-                                                   unsigned Alignment,
-                                                   unsigned SectionID) {
-  return allocateSection(CodeMem, Size, Alignment);
-}
-
-uint8_t *SectionMemoryManager::allocateSection(MemoryGroup &MemGroup,
-                                               uintptr_t Size,
-                                               unsigned Alignment) {
-  if (!Alignment)
-    Alignment = 16;
-
-  assert(!(Alignment & (Alignment - 1)) && "Alignment must be a power of two.");
-
-  uintptr_t RequiredSize = Alignment * ((Size + Alignment - 1)/Alignment + 1);
-  uintptr_t Addr = 0;
-
-  // Look in the list of free memory regions and use a block there if one
-  // is available.
-  for (int i = 0, e = MemGroup.FreeMem.size(); i != e; ++i) {
-    sys::MemoryBlock &MB = MemGroup.FreeMem[i];
-    if (MB.size() >= RequiredSize) {
-      Addr = (uintptr_t)MB.base();
-      uintptr_t EndOfBlock = Addr + MB.size();
-      // Align the address.
-      Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
-      // Store cutted free memory block.
-      MemGroup.FreeMem[i] = sys::MemoryBlock((void*)(Addr + Size),
-                                             EndOfBlock - Addr - Size);
-      return (uint8_t*)Addr;
-    }
-  }
-
-  // No pre-allocated free block was large enough. Allocate a new memory region.
-  // Note that all sections get allocated as read-write.  The permissions will
-  // be updated later based on memory group.
-  //
-  // FIXME: It would be useful to define a default allocation size (or add
-  // it as a constructor parameter) to minimize the number of allocations.
-  // 
-  // FIXME: Initialize the Near member for each memory group to avoid
-  // interleaving.
-  error_code ec;
-  sys::MemoryBlock MB = sys::Memory::allocateMappedMemory(RequiredSize,
-                                                          &MemGroup.Near,
-                                                          sys::Memory::MF_READ |
-                                                            sys::Memory::MF_WRITE,
-                                                          ec);
-  if (ec) {
-    // FIXME: Add error propogation to the interface.
-    return NULL;
-  }
-
-  // Save this address as the basis for our next request
-  MemGroup.Near = MB;
-
-  MemGroup.AllocatedMem.push_back(MB);
-  Addr = (uintptr_t)MB.base();
-  uintptr_t EndOfBlock = Addr + MB.size();
-
-  // Align the address.
-  Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
-
-  // The allocateMappedMemory may allocate much more memory than we need. In
-  // this case, we store the unused memory as a free memory block.
-  unsigned FreeSize = EndOfBlock-Addr-Size;
-  if (FreeSize > 16)
-    MemGroup.FreeMem.push_back(sys::MemoryBlock((void*)(Addr + Size), FreeSize));
-
-  // Return aligned address
-  return (uint8_t*)Addr;
-}
-
-bool SectionMemoryManager::applyPermissions(std::string *ErrMsg)
-{
-  // FIXME: Should in-progress permissions be reverted if an error occurs?
-  error_code ec;
-
-  // Make code memory executable.
-  ec = applyMemoryGroupPermissions(CodeMem,
-                                   sys::Memory::MF_READ | sys::Memory::MF_EXEC);
-  if (ec) {
-    if (ErrMsg) {
-      *ErrMsg = ec.message();
-    }
-    return true;
-  }
-
-  // Make read-only data memory read-only.
-  ec = applyMemoryGroupPermissions(RODataMem,
-                                   sys::Memory::MF_READ | sys::Memory::MF_EXEC);
-  if (ec) {
-    if (ErrMsg) {
-      *ErrMsg = ec.message();
-    }
-    return true;
-  }
-
-  // Read-write data memory already has the correct permissions
-
-  return false;
-}
-
-error_code SectionMemoryManager::applyMemoryGroupPermissions(MemoryGroup &MemGroup,
-                                                             unsigned Permissions) {
-
-  for (int i = 0, e = MemGroup.AllocatedMem.size(); i != e; ++i) {
-      error_code ec;
-      ec = sys::Memory::protectMappedMemory(MemGroup.AllocatedMem[i],
-                                            Permissions);
-      if (ec) {
-        return ec;
-      }
-  }
-
-  return error_code::success();
-}
-
-void SectionMemoryManager::invalidateInstructionCache() {
-  for (int i = 0, e = CodeMem.AllocatedMem.size(); i != e; ++i)
-    sys::Memory::InvalidateInstructionCache(CodeMem.AllocatedMem[i].base(),
-                                            CodeMem.AllocatedMem[i].size());
-}
-
-static int jit_noop() {
-  return 0;
-}
-
-void *SectionMemoryManager::getPointerToNamedFunction(const std::string &Name,
-                                                       bool AbortOnFailure) {
-#if defined(__linux__)
-  //===--------------------------------------------------------------------===//
-  // Function stubs that are invoked instead of certain library calls
-  //
-  // Force the following functions to be linked in to anything that uses the
-  // JIT. This is a hack designed to work around the all-too-clever Glibc
-  // strategy of making these functions work differently when inlined vs. when
-  // not inlined, and hiding their real definitions in a separate archive file
-  // that the dynamic linker can't see. For more info, search for
-  // 'libc_nonshared.a' on Google, or read http://llvm.org/PR274.
-  if (Name == "stat") return (void*)(intptr_t)&stat;
-  if (Name == "fstat") return (void*)(intptr_t)&fstat;
-  if (Name == "lstat") return (void*)(intptr_t)&lstat;
-  if (Name == "stat64") return (void*)(intptr_t)&stat64;
-  if (Name == "fstat64") return (void*)(intptr_t)&fstat64;
-  if (Name == "lstat64") return (void*)(intptr_t)&lstat64;
-  if (Name == "atexit") return (void*)(intptr_t)&atexit;
-  if (Name == "mknod") return (void*)(intptr_t)&mknod;
-#endif // __linux__
-
-  // We should not invoke parent's ctors/dtors from generated main()!
-  // On Mingw and Cygwin, the symbol __main is resolved to
-  // callee's(eg. tools/lli) one, to invoke wrong duplicated ctors
-  // (and register wrong callee's dtors with atexit(3)).
-  // We expect ExecutionEngine::runStaticConstructorsDestructors()
-  // is called before ExecutionEngine::runFunctionAsMain() is called.
-  if (Name == "__main") return (void*)(intptr_t)&jit_noop;
-
-  const char *NameStr = Name.c_str();
-  void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr);
-  if (Ptr) return Ptr;
-
-  // If it wasn't found and if it starts with an underscore ('_') character,
-  // try again without the underscore.
-  if (NameStr[0] == '_') {
-    Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1);
-    if (Ptr) return Ptr;
-  }
-
-  if (AbortOnFailure)
-    report_fatal_error("Program used external function '" + Name +
-                      "' which could not be resolved!");
-  return 0;
-}
-
-SectionMemoryManager::~SectionMemoryManager() {
-  for (unsigned i = 0, e = CodeMem.AllocatedMem.size(); i != e; ++i)
-    sys::Memory::releaseMappedMemory(CodeMem.AllocatedMem[i]);
-  for (unsigned i = 0, e = RWDataMem.AllocatedMem.size(); i != e; ++i)
-    sys::Memory::releaseMappedMemory(RWDataMem.AllocatedMem[i]);
-  for (unsigned i = 0, e = RODataMem.AllocatedMem.size(); i != e; ++i)
-    sys::Memory::releaseMappedMemory(RODataMem.AllocatedMem[i]);
-}
-
-} // namespace llvm
-
diff --git a/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.h b/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.h
deleted file mode 100644
index 7d5a5ff3f3..0000000000
--- a/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.h
+++ /dev/null
@@ -1,176 +0,0 @@
-//===- SectionMemoryManager.h - Memory manager for MCJIT/RtDyld -*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains the declaration of a section-based memory manager used by
-// the MCJIT execution engine and RuntimeDyld.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_EXECUTION_ENGINE_SECTION_MEMORY_MANAGER_H
-#define LLVM_EXECUTION_ENGINE_SECTION_MEMORY_MANAGER_H
-
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ExecutionEngine/JITMemoryManager.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/Memory.h"
-
-namespace llvm {
-
-/// This is a simple memory manager which implements the methods called by 
-/// the RuntimeDyld class to allocate memory for section-based loading of
-/// objects, usually those generated by the MCJIT execution engine.
-/// 
-/// This memory manager allocates all section memory as read-write.  The 
-/// RuntimeDyld will copy JITed section memory into these allocated blocks
-/// and perform any necessary linking and relocations.
-/// 
-/// Any client using this memory manager MUST ensure that section-specific
-/// page permissions have been applied before attempting to execute functions
-/// in the JITed object.  Permissions can be applied either by calling
-/// MCJIT::finalizeObject or by calling SectionMemoryManager::applyPermissions
-/// directly.  Clients of MCJIT should call MCJIT::finalizeObject.
-class SectionMemoryManager : public JITMemoryManager {
-  SectionMemoryManager(const SectionMemoryManager&) LLVM_DELETED_FUNCTION;
-  void operator=(const SectionMemoryManager&) LLVM_DELETED_FUNCTION;
-
-public:
-  SectionMemoryManager() { }
-  virtual ~SectionMemoryManager();
-
-  /// \brief Allocates a memory block of (at least) the given size suitable for
-  /// executable code.
-  /// 
-  /// The value of \p Alignment must be a power of two.  If \p Alignment is zero
-  /// a default alignment of 16 will be used.
-  virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
-                                       unsigned SectionID);
-
-  /// \brief Allocates a memory block of (at least) the given size suitable for
-  /// executable code.
-  /// 
-  /// The value of \p Alignment must be a power of two.  If \p Alignment is zero
-  /// a default alignment of 16 will be used.
-  virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
-                                       unsigned SectionID,
-                                       bool isReadOnly);
-
-  /// \brief Applies section-specific memory permissions.
-  ///
-  /// This method is called when object loading is complete and section page
-  /// permissions can be applied.  It is up to the memory manager implementation
-  /// to decide whether or not to act on this method.  The memory manager will
-  /// typically allocate all sections as read-write and then apply specific
-  /// permissions when this method is called.  Code sections cannot be executed
-  /// until this function has been called.
-  ///
-  /// \returns true if an error occurred, false otherwise.
-  virtual bool applyPermissions(std::string *ErrMsg = 0);
-
-  /// This method returns the address of the specified function. As such it is
-  /// only useful for resolving library symbols, not code generated symbols.
-  ///
-  /// If \p AbortOnFailure is false and no function with the given name is
-  /// found, this function returns a null pointer. Otherwise, it prints a
-  /// message to stderr and aborts.
-  virtual void *getPointerToNamedFunction(const std::string &Name,
-                                          bool AbortOnFailure = true);
-
-  /// \brief Invalidate instruction cache for code sections.
-  ///
-  /// Some platforms with separate data cache and instruction cache require
-  /// explicit cache flush, otherwise JIT code manipulations (like resolved
-  /// relocations) will get to the data cache but not to the instruction cache.
-  /// 
-  /// This method is not called by RuntimeDyld or MCJIT during the load
-  /// process.  Clients may call this function when needed.  See the lli
-  /// tool for example use.
-  virtual void invalidateInstructionCache();
-
-private:
-  struct MemoryGroup {
-      SmallVector<sys::MemoryBlock, 16> AllocatedMem;
-      SmallVector<sys::MemoryBlock, 16> FreeMem;
-      sys::MemoryBlock Near;
-  };
-
-  uint8_t *allocateSection(MemoryGroup &MemGroup, uintptr_t Size,
-                           unsigned Alignment);
-
-  error_code applyMemoryGroupPermissions(MemoryGroup &MemGroup,
-                                         unsigned Permissions);
-
-  MemoryGroup CodeMem;
-  MemoryGroup RWDataMem;
-  MemoryGroup RODataMem;
-
-public:
-  ///
-  /// Functions below are not used by MCJIT or RuntimeDyld, but must be
-  /// implemented because they are declared as pure virtuals in the base class.
-  ///
-
-  virtual void setMemoryWritable() {
-    llvm_unreachable("Unexpected call!");
-  }
-  virtual void setMemoryExecutable() {
-    llvm_unreachable("Unexpected call!");
-  }
-  virtual void setPoisonMemory(bool poison) {
-    llvm_unreachable("Unexpected call!");
-  }
-  virtual void AllocateGOT() {
-    llvm_unreachable("Unexpected call!");
-  }
-  virtual uint8_t *getGOTBase() const {
-    llvm_unreachable("Unexpected call!");
-    return 0;
-  }
-  virtual uint8_t *startFunctionBody(const Function *F,
-                                     uintptr_t &ActualSize){
-    llvm_unreachable("Unexpected call!");
-    return 0;
-  }
-  virtual uint8_t *allocateStub(const GlobalValue* F, unsigned StubSize,
-                                unsigned Alignment) {
-    llvm_unreachable("Unexpected call!");
-    return 0;
-  }
-  virtual void endFunctionBody(const Function *F, uint8_t *FunctionStart,
-                               uint8_t *FunctionEnd) {
-    llvm_unreachable("Unexpected call!");
-  }
-  virtual uint8_t *allocateSpace(intptr_t Size, unsigned Alignment) {
-    llvm_unreachable("Unexpected call!");
-    return 0;
-  }
-  virtual uint8_t *allocateGlobal(uintptr_t Size, unsigned Alignment) {
-    llvm_unreachable("Unexpected call!");
-    return 0;
-  }
-  virtual void deallocateFunctionBody(void *Body) {
-    llvm_unreachable("Unexpected call!");
-  }
-  virtual uint8_t *startExceptionTable(const Function *F,
-                                       uintptr_t &ActualSize) {
-    llvm_unreachable("Unexpected call!");
-    return 0;
-  }
-  virtual void endExceptionTable(const Function *F, uint8_t *TableStart,
-                                 uint8_t *TableEnd, uint8_t *FrameRegister) {
-    llvm_unreachable("Unexpected call!");
-  }
-  virtual void deallocateExceptionTable(void *ET) {
-    llvm_unreachable("Unexpected call!");
-  }
-};
-
-}
-
-#endif // LLVM_EXECUTION_ENGINE_SECTION_MEMORY_MANAGER_H
-