TargetLibraryInfo.h revision 022708f221e2a9ea1a42c07c7cd7817a8de881dc
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      /// int iprintf(const char *format, ...);
30      iprintf,
31
32      /// int siprintf(char *str, const char *format, ...);
33      siprintf,
34
35      /// int fiprintf(FILE *stream, const char *format, ...);
36      fiprintf,
37
38      NumLibFuncs
39    };
40  }
41
42/// TargetLibraryInfo - This immutable pass captures information about what
43/// library functions are available for the current target, and allows a
44/// frontend to disable optimizations through -fno-builtin etc.
45class TargetLibraryInfo : public ImmutablePass {
46  unsigned char AvailableArray[(LibFunc::NumLibFuncs+7)/8];
47public:
48  static char ID;
49  TargetLibraryInfo();
50  TargetLibraryInfo(const Triple &T);
51
52  /// has - This function is used by optimizations that want to match on or form
53  /// a given library function.
54  bool has(LibFunc::Func F) const {
55    return (AvailableArray[F/8] & (1 << (F&7))) != 0;
56  }
57
58  /// setUnavailable - this can be used by whatever sets up TargetLibraryInfo to
59  /// ban use of specific library functions.
60  void setUnavailable(LibFunc::Func F) {
61    AvailableArray[F/8] &= ~(1 << (F&7));
62  }
63
64  void setAvailable(LibFunc::Func F) {
65    AvailableArray[F/8] |= 1 << (F&7);
66  }
67
68  /// disableAllFunctions - This disables all builtins, which is used for
69  /// options like -fno-builtin.
70  void disableAllFunctions();
71};
72
73} // end namespace llvm
74
75#endif
76