forked from OSchip/llvm-project
135 lines
4.9 KiB
C++
135 lines
4.9 KiB
C++
//===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Unified name mangler for assembly backends.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/Mangler.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
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/// and the specified name as the global variable name. GVName must not be
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/// empty.
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void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
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const Twine &GVName, ManglerPrefixTy PrefixTy) {
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SmallString<256> TmpData;
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StringRef Name = GVName.toStringRef(TmpData);
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assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
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const MCAsmInfo *MAI = TM->getMCAsmInfo();
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// If the global name is not led with \1, add the appropriate prefixes.
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if (Name[0] == '\1') {
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Name = Name.substr(1);
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} else {
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if (PrefixTy == Mangler::Private) {
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const char *Prefix = MAI->getPrivateGlobalPrefix();
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OutName.append(Prefix, Prefix+strlen(Prefix));
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} else if (PrefixTy == Mangler::LinkerPrivate) {
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const char *Prefix = MAI->getLinkerPrivateGlobalPrefix();
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OutName.append(Prefix, Prefix+strlen(Prefix));
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}
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char Prefix = MAI->getGlobalPrefix();
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if (Prefix != '\0')
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OutName.push_back(Prefix);
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}
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// If this is a simple string that doesn't need escaping, just append it.
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OutName.append(Name.begin(), Name.end());
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}
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/// AddFastCallStdCallSuffix - Microsoft fastcall and stdcall functions require
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/// a suffix on their name indicating the number of words of arguments they
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/// take.
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static void AddFastCallStdCallSuffix(SmallVectorImpl<char> &OutName,
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const Function *F, const DataLayout &TD) {
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// Calculate arguments size total.
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unsigned ArgWords = 0;
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for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
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AI != AE; ++AI) {
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Type *Ty = AI->getType();
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// 'Dereference' type in case of byval parameter attribute
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if (AI->hasByValAttr())
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Ty = cast<PointerType>(Ty)->getElementType();
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// Size should be aligned to DWORD boundary
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ArgWords += ((TD.getTypeAllocSize(Ty) + 3)/4)*4;
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}
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raw_svector_ostream(OutName) << '@' << ArgWords;
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}
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/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
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/// and the specified global variable's name. If the global variable doesn't
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/// have a name, this fills in a unique name for the global.
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void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
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const GlobalValue *GV) {
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ManglerPrefixTy PrefixTy = Mangler::Default;
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if (GV->hasPrivateLinkage())
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PrefixTy = Mangler::Private;
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else if (GV->hasLinkerPrivateLinkage() || GV->hasLinkerPrivateWeakLinkage())
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PrefixTy = Mangler::LinkerPrivate;
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// If this global has a name, handle it simply.
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if (GV->hasName()) {
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StringRef Name = GV->getName();
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getNameWithPrefix(OutName, Name, PrefixTy);
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// No need to do anything else if the global has the special "do not mangle"
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// flag in the name.
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if (Name[0] == 1)
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return;
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} else {
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// Get the ID for the global, assigning a new one if we haven't got one
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// already.
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unsigned &ID = AnonGlobalIDs[GV];
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if (ID == 0) ID = NextAnonGlobalID++;
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// Must mangle the global into a unique ID.
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getNameWithPrefix(OutName, "__unnamed_" + Twine(ID), PrefixTy);
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}
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// If we are supposed to add a microsoft-style suffix for stdcall/fastcall,
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// add it.
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if (TM->getMCAsmInfo()->hasMicrosoftFastStdCallMangling()) {
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if (const Function *F = dyn_cast<Function>(GV)) {
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CallingConv::ID CC = F->getCallingConv();
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// fastcall functions need to start with @.
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// FIXME: This logic seems unlikely to be right.
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if (CC == CallingConv::X86_FastCall) {
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if (OutName[0] == '_')
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OutName[0] = '@';
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else
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OutName.insert(OutName.begin(), '@');
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}
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// fastcall and stdcall functions usually need @42 at the end to specify
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// the argument info.
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FunctionType *FT = F->getFunctionType();
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if ((CC == CallingConv::X86_FastCall || CC == CallingConv::X86_StdCall) &&
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// "Pure" variadic functions do not receive @0 suffix.
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(!FT->isVarArg() || FT->getNumParams() == 0 ||
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(FT->getNumParams() == 1 && F->hasStructRetAttr())))
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AddFastCallStdCallSuffix(OutName, F, *TM->getDataLayout());
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}
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}
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}
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