1 //===- BuildLibCalls.h - Utility builder for libcalls -----------*- 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 exposes an interface to build some C language libcalls for 11 // optimization passes that need to call the various functions. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_TRANSFORMS_UTILS_BUILDLIBCALLS_H 16 #define LLVM_TRANSFORMS_UTILS_BUILDLIBCALLS_H 17 18 #include "llvm/IR/IRBuilder.h" 19 20 namespace llvm { 21 class Value; 22 class DataLayout; 23 class TargetLibraryInfo; 24 25 /// Analyze the name and prototype of the given function and set any 26 /// applicable attributes. 27 /// If the library function is unavailable, this doesn't modify it. 28 /// 29 /// Returns true if any attributes were set and false otherwise. 30 bool inferLibFuncAttributes(Function &F, const TargetLibraryInfo &TLI); 31 32 /// Return V if it is an i8*, otherwise cast it to i8*. 33 Value *castToCStr(Value *V, IRBuilder<> &B); 34 35 /// Emit a call to the strlen function to the builder, for the specified 36 /// pointer. Ptr is required to be some pointer type, and the return value has 37 /// 'intptr_t' type. 38 Value *emitStrLen(Value *Ptr, IRBuilder<> &B, const DataLayout &DL, 39 const TargetLibraryInfo *TLI); 40 41 /// Emit a call to the strnlen function to the builder, for the specified 42 /// pointer. Ptr is required to be some pointer type, MaxLen must be of size_t 43 /// type, and the return value has 'intptr_t' type. 44 Value *emitStrNLen(Value *Ptr, Value *MaxLen, IRBuilder<> &B, 45 const DataLayout &DL, const TargetLibraryInfo *TLI); 46 47 /// Emit a call to the strchr function to the builder, for the specified 48 /// pointer and character. Ptr is required to be some pointer type, and the 49 /// return value has 'i8*' type. 50 Value *emitStrChr(Value *Ptr, char C, IRBuilder<> &B, 51 const TargetLibraryInfo *TLI); 52 53 /// Emit a call to the strncmp function to the builder. 54 Value *emitStrNCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B, 55 const DataLayout &DL, const TargetLibraryInfo *TLI); 56 57 /// Emit a call to the strcpy function to the builder, for the specified 58 /// pointer arguments. 59 Value *emitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B, 60 const TargetLibraryInfo *TLI, StringRef Name = "strcpy"); 61 62 /// Emit a call to the strncpy function to the builder, for the specified 63 /// pointer arguments and length. 64 Value *emitStrNCpy(Value *Dst, Value *Src, Value *Len, IRBuilder<> &B, 65 const TargetLibraryInfo *TLI, StringRef Name = "strncpy"); 66 67 /// Emit a call to the __memcpy_chk function to the builder. This expects that 68 /// the Len and ObjSize have type 'intptr_t' and Dst/Src are pointers. 69 Value *emitMemCpyChk(Value *Dst, Value *Src, Value *Len, Value *ObjSize, 70 IRBuilder<> &B, const DataLayout &DL, 71 const TargetLibraryInfo *TLI); 72 73 /// Emit a call to the memchr function. This assumes that Ptr is a pointer, 74 /// Val is an i32 value, and Len is an 'intptr_t' value. 75 Value *emitMemChr(Value *Ptr, Value *Val, Value *Len, IRBuilder<> &B, 76 const DataLayout &DL, const TargetLibraryInfo *TLI); 77 78 /// Emit a call to the memcmp function. 79 Value *emitMemCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B, 80 const DataLayout &DL, const TargetLibraryInfo *TLI); 81 82 /// Emit a call to the unary function named 'Name' (e.g. 'floor'). This 83 /// function is known to take a single of type matching 'Op' and returns one 84 /// value with the same type. If 'Op' is a long double, 'l' is added as the 85 /// suffix of name, if 'Op' is a float, we add a 'f' suffix. 86 Value *emitUnaryFloatFnCall(Value *Op, StringRef Name, IRBuilder<> &B, 87 const AttributeList &Attrs); 88 89 /// Emit a call to the binary function named 'Name' (e.g. 'fmin'). This 90 /// function is known to take type matching 'Op1' and 'Op2' and return one 91 /// value with the same type. If 'Op1/Op2' are long double, 'l' is added as 92 /// the suffix of name, if 'Op1/Op2' are float, we add a 'f' suffix. 93 Value *emitBinaryFloatFnCall(Value *Op1, Value *Op2, StringRef Name, 94 IRBuilder<> &B, const AttributeList &Attrs); 95 96 /// Emit a call to the putchar function. This assumes that Char is an integer. 97 Value *emitPutChar(Value *Char, IRBuilder<> &B, const TargetLibraryInfo *TLI); 98 99 /// Emit a call to the puts function. This assumes that Str is some pointer. 100 Value *emitPutS(Value *Str, IRBuilder<> &B, const TargetLibraryInfo *TLI); 101 102 /// Emit a call to the fputc function. This assumes that Char is an i32, and 103 /// File is a pointer to FILE. 104 Value *emitFPutC(Value *Char, Value *File, IRBuilder<> &B, 105 const TargetLibraryInfo *TLI); 106 107 /// Emit a call to the puts function. Str is required to be a pointer and 108 /// File is a pointer to FILE. 109 Value *emitFPutS(Value *Str, Value *File, IRBuilder<> &B, 110 const TargetLibraryInfo *TLI); 111 112 /// Emit a call to the fwrite function. This assumes that Ptr is a pointer, 113 /// Size is an 'intptr_t', and File is a pointer to FILE. 114 Value *emitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilder<> &B, 115 const DataLayout &DL, const TargetLibraryInfo *TLI); 116 } 117 118 #endif 119
