lib/Target/TargetLibraryInfo.cpp

   1 //===-- TargetLibraryInfo.cpp - Runtime library information ----------------==//
   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 implements the TargetLibraryInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Target/TargetLibraryInfo.h"
  15 #include "llvm/ADT/Triple.h"
  16 using namespace llvm;
  17
  18 // Register the default implementation.
  19 INITIALIZE_PASS(TargetLibraryInfo, "targetlibinfo",
  20                 "Target Library Information", false, true)
  21 char TargetLibraryInfo::ID = 0;
  22
  23 /// initialize - Initialize the set of available library functions based on the
  24 /// specified target triple.  This should be carefully written so that a missing
  25 /// target triple gets a sane set of defaults.
  26 static void initialize(TargetLibraryInfo &TLI, const Triple &T) {
  27   initializeTargetLibraryInfoPass(*PassRegistry::getPassRegistry());
  28
  29
  30   // memset_pattern16 is only available on iOS 3.0 and Mac OS/X 10.5 and later.
  31   if (T.isMacOSX()) {
  32     if (T.isMacOSXVersionLT(10, 5))
  33       TLI.setUnavailable(LibFunc::memset_pattern16);
  34   } else if (T.getOS() == Triple::IOS) {
  35     if (T.isOSVersionLT(3, 0))
  36       TLI.setUnavailable(LibFunc::memset_pattern16);
  37   } else {
  38     TLI.setUnavailable(LibFunc::memset_pattern16);
  39   }
  40
  41   // iprintf and friends are only available on XCore and TCE.
  42   if (T.getArch() != Triple::xcore && T.getArch() != Triple::tce) {
  43     TLI.setUnavailable(LibFunc::iprintf);
  44     TLI.setUnavailable(LibFunc::siprintf);
  45     TLI.setUnavailable(LibFunc::fiprintf);
  46   }
  47 }
  48
  49
  50 TargetLibraryInfo::TargetLibraryInfo() : ImmutablePass(ID) {
  51   // Default to everything being available.
  52   memset(AvailableArray, -1, sizeof(AvailableArray));
  53
  54   initialize(*this, Triple());
  55 }
  56
  57 TargetLibraryInfo::TargetLibraryInfo(const Triple &T) : ImmutablePass(ID) {
  58   // Default to everything being available.
  59   memset(AvailableArray, -1, sizeof(AvailableArray));
  60
  61   initialize(*this, T);
  62 }
  63
  64 TargetLibraryInfo::TargetLibraryInfo(const TargetLibraryInfo &TLI)
  65   : ImmutablePass(ID) {
  66   memcpy(AvailableArray, TLI.AvailableArray, sizeof(AvailableArray));
  67 }
  68
  69
  70 /// disableAllFunctions - This disables all builtins, which is used for options
  71 /// like -fno-builtin.
  72 void TargetLibraryInfo::disableAllFunctions() {
  73   memset(AvailableArray, 0, sizeof(AvailableArray));
  74 }