1 //===- Memory.cpp - Memory Handling Support ---------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines some helpful functions for allocating memory and dealing
11 // with memory mapped files
13 //===----------------------------------------------------------------------===//
15 #include "llvm/System/Memory.h"
16 #include "llvm/Config/config.h"
22 // Include the platform-specific parts of this class.
24 #include "Unix/Memory.inc"
27 #include "Win32/Memory.inc"
30 /// InvalidateInstructionCache - Before the JIT can run a block of code
31 /// that has been emitted it must invalidate the instruction cache on some
33 void llvm::sys::Memory::InvalidateInstructionCache(const void *Addr,
36 // icache invalidation for PPC.
37 #if (defined(__POWERPC__) || defined (__ppc__) || \
38 defined(_POWER) || defined(_ARCH_PPC))
39 #if defined(__APPLE__)
40 extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
41 sys_icache_invalidate(Addr, len);
42 #elif defined(__GNUC__)
43 const size_t LineSize = 32;
45 const intptr_t Mask = ~(LineSize - 1);
46 const intptr_t StartLine = ((intptr_t) Addr) & Mask;
47 const intptr_t EndLine = ((intptr_t) Addr + len + LineSize - 1) & Mask;
49 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
50 asm volatile("dcbf 0, %0" : : "r"(Line));
53 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
54 asm volatile("icbi 0, %0" : : "r"(Line));
55 asm volatile("isync");