TargetLibraryInfo.h revision 188a7e00e784f78d6b5b250a64ac5c374f0fd3f0
1//===-- llvm/Target/TargetLibraryInfo.h - Library information ---*- 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#ifndef LLVM_TARGET_TARGETLIBRARYINFO_H 11#define LLVM_TARGET_TARGETLIBRARYINFO_H 12 13#include "llvm/Pass.h" 14 15namespace llvm { 16 class Triple; 17 18 namespace LibFunc { 19 enum Func { 20 /// void *memset(void *b, int c, size_t len); 21 memset, 22 23 // void *memcpy(void *s1, const void *s2, size_t n); 24 memcpy, 25 26 /// void memset_pattern16(void *b, const void *pattern16, size_t len); 27 memset_pattern16, 28 29 NumLibFuncs 30 }; 31 } 32 33/// TargetLibraryInfo - This immutable pass captures information about what 34/// library functions are available for the current target, and allows a 35/// frontend to disable optimizations through -fno-builtin etc. 36class TargetLibraryInfo : public ImmutablePass { 37 unsigned char AvailableArray[(LibFunc::NumLibFuncs+7)/8]; 38public: 39 static char ID; 40 TargetLibraryInfo(); 41 TargetLibraryInfo(const Triple &T); 42 43 /// has - This function is used by optimizations that want to match on or form 44 /// a given library function. 45 bool has(LibFunc::Func F) const { 46 return (AvailableArray[F/8] & (1 << (F&7))) != 0; 47 } 48 49 /// setUnavailable - this can be used by whatever sets up TargetLibraryInfo to 50 /// ban use of specific library functions. 51 void setUnavailable(LibFunc::Func F) { 52 AvailableArray[F/8] &= ~(1 << (F&7)); 53 } 54 55 void setAvailable(LibFunc::Func F) { 56 AvailableArray[F/8] |= 1 << (F&7); 57 } 58 59 /// disableAllFunctions - This disables all builtins, which is used for 60 /// options like -fno-builtin. 61 void disableAllFunctions(); 62}; 63 64} // end namespace llvm 65 66#endif 67