lib/Support/Memory.cpp

   1 //===- Memory.cpp - Memory Handling Support ---------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines some helpful functions for allocating memory and dealing
  11 // with memory mapped files
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/Support/Memory.h"
  16 #include "llvm/Support/Valgrind.h"
  17 #include "llvm/Config/config.h"
  18
  19 namespace llvm {
  20 using namespace sys;
  21 }
  22
  23 // Include the platform-specific parts of this class.
  24 #ifdef LLVM_ON_UNIX
  25 #include "Unix/Memory.inc"
  26 #endif
  27 #ifdef LLVM_ON_WIN32
  28 #include "Windows/Memory.inc"
  29 #endif
  30
  31 extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
  32
  33 /// InvalidateInstructionCache - Before the JIT can run a block of code
  34 /// that has been emitted it must invalidate the instruction cache on some
  35 /// platforms.
  36 void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr,
  37                                                    size_t Len) {
  38
  39 // icache invalidation for PPC and ARM.
  40 #if defined(__APPLE__)
  41
  42 #  if (defined(__POWERPC__) || defined (__ppc__) || \
  43      defined(_POWER) || defined(_ARCH_PPC)) || defined(__arm__)
  44   sys_icache_invalidate(Addr, Len);
  45 #  endif
  46
  47 #else
  48
  49 #  if (defined(__POWERPC__) || defined (__ppc__) || \
  50        defined(_POWER) || defined(_ARCH_PPC)) && defined(__GNUC__)
  51   const size_t LineSize = 32;
  52
  53   const intptr_t Mask = ~(LineSize - 1);
  54   const intptr_t StartLine = ((intptr_t) Addr) & Mask;
  55   const intptr_t EndLine = ((intptr_t) Addr + Len + LineSize - 1) & Mask;
  56
  57   for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
  58     asm volatile("dcbf 0, %0" : : "r"(Line));
  59   asm volatile("sync");
  60
  61   for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
  62     asm volatile("icbi 0, %0" : : "r"(Line));
  63   asm volatile("isync");
  64 #  elif defined(__arm__) && defined(__GNUC__)
  65   // FIXME: Can we safely always call this for __GNUC__ everywhere?
  66   char *Start = (char*) Addr;
  67   char *End = Start + Len;
  68   __clear_cache(Start, End);
  69 #  endif
  70
  71 #endif  // end apple
  72
  73   ValgrindDiscardTranslations(Addr, Len);
  74 }