1 //===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
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 // Unified name mangler for assembly backends.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/IR/Mangler.h"
15 #include "llvm/ADT/SmallString.h"
16 #include "llvm/ADT/Twine.h"
17 #include "llvm/IR/DataLayout.h"
18 #include "llvm/IR/DerivedTypes.h"
19 #include "llvm/IR/Function.h"
20 #include "llvm/Support/raw_ostream.h"
23 static void getNameWithPrefixx(raw_ostream &OS, const Twine &GVName,
24 Mangler::ManglerPrefixTy PrefixTy,
25 const DataLayout &DL, bool UseAt) {
26 SmallString<256> TmpData;
27 StringRef Name = GVName.toStringRef(TmpData);
28 assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
30 if (PrefixTy == Mangler::Private)
31 OS << DL.getPrivateGlobalPrefix();
32 else if (PrefixTy == Mangler::LinkerPrivate)
33 OS << DL.getLinkerPrivateGlobalPrefix();
38 char Prefix = DL.getGlobalPrefix();
43 // If this is a simple string that doesn't need escaping, just append it.
47 void Mangler::getNameWithPrefix(raw_ostream &OS,
48 const Twine &GVName, ManglerPrefixTy PrefixTy) {
49 return getNameWithPrefixx(OS, GVName, PrefixTy, *DL, false);
52 void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
53 const Twine &GVName, ManglerPrefixTy PrefixTy) {
54 raw_svector_ostream OS(OutName);
55 return getNameWithPrefix(OS, GVName, PrefixTy);
58 /// AddFastCallStdCallSuffix - Microsoft fastcall and stdcall functions require
59 /// a suffix on their name indicating the number of words of arguments they
61 static void AddFastCallStdCallSuffix(raw_ostream &OS, const Function *F,
62 const DataLayout &TD) {
63 // Calculate arguments size total.
64 unsigned ArgWords = 0;
65 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
67 Type *Ty = AI->getType();
68 // 'Dereference' type in case of byval parameter attribute
69 if (AI->hasByValAttr())
70 Ty = cast<PointerType>(Ty)->getElementType();
71 // Size should be aligned to DWORD boundary
72 ArgWords += ((TD.getTypeAllocSize(Ty) + 3)/4)*4;
75 OS << '@' << ArgWords;
78 void Mangler::getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV) {
79 ManglerPrefixTy PrefixTy = Mangler::Default;
80 if (GV->hasPrivateLinkage())
81 PrefixTy = Mangler::Private;
82 else if (GV->hasLinkerPrivateLinkage() || GV->hasLinkerPrivateWeakLinkage())
83 PrefixTy = Mangler::LinkerPrivate;
86 // Get the ID for the global, assigning a new one if we haven't got one
88 unsigned &ID = AnonGlobalIDs[GV];
90 ID = NextAnonGlobalID++;
92 // Must mangle the global into a unique ID.
93 getNameWithPrefix(OS, "__unnamed_" + Twine(ID), PrefixTy);
97 StringRef Name = GV->getName();
99 // No need to do anything special if the global has the special "do not
100 // mangle" flag in the name.
101 if (Name[0] == '\1') {
102 OS << Name.substr(1);
107 const Function *MSFunc = NULL;
109 if (DL->hasMicrosoftFastStdCallMangling()) {
110 if ((MSFunc = dyn_cast<Function>(GV))) {
111 CC = MSFunc->getCallingConv();
112 // fastcall functions need to start with @ instead of _.
113 if (CC == CallingConv::X86_FastCall)
118 getNameWithPrefixx(OS, Name, PrefixTy, *DL, UseAt);
123 // If we are supposed to add a microsoft-style suffix for stdcall/fastcall,
125 // fastcall and stdcall functions usually need @42 at the end to specify
126 // the argument info.
127 FunctionType *FT = MSFunc->getFunctionType();
128 if ((CC == CallingConv::X86_FastCall || CC == CallingConv::X86_StdCall) &&
129 // "Pure" variadic functions do not receive @0 suffix.
130 (!FT->isVarArg() || FT->getNumParams() == 0 ||
131 (FT->getNumParams() == 1 && MSFunc->hasStructRetAttr())))
132 AddFastCallStdCallSuffix(OS, MSFunc, *DL);
135 void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
136 const GlobalValue *GV) {
137 raw_svector_ostream OS(OutName);
138 getNameWithPrefix(OS, GV);