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//===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Unified name mangler for assembly backends.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/Mangler.h"
#include "llvm/GlobalValue.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
/// and the specified name as the global variable name. GVName must not be
/// empty.
void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
const Twine &GVName, ManglerPrefixTy PrefixTy) {
SmallString<256> TmpData;
StringRef Name = GVName.toStringRef(TmpData);
assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
// If the global name is not led with \1, add the appropriate prefixes.
if (Name[0] != '\1') {
if (PrefixTy == Mangler::Private)
OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix));
else if (PrefixTy == Mangler::LinkerPrivate)
OutName.append(LinkerPrivatePrefix,
LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));
if (Prefix[0] == 0)
; // Common noop, no prefix.
else if (Prefix[1] == 0)
OutName.push_back(Prefix[0]); // Common, one character prefix.
else
OutName.append(Prefix, Prefix+strlen(Prefix)); // Arbitrary prefix.
} else {
Name = Name.substr(1);
}
OutName.append(Name.begin(), Name.end());
}
/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
/// and the specified global variable's name. If the global variable doesn't
/// have a name, this fills in a unique name for the global.
void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
const GlobalValue *GV,
bool isImplicitlyPrivate) {
// If this global has a name, handle it simply.
if (GV->hasName()) {
ManglerPrefixTy PrefixTy = Mangler::Default;
if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
PrefixTy = Mangler::Private;
else if (GV->hasLinkerPrivateLinkage())
PrefixTy = Mangler::LinkerPrivate;
return getNameWithPrefix(OutName, GV->getName(), PrefixTy);
}
// If the global variable doesn't have a name, return a unique name for the
// global based on a numbering.
// Anonymous names always get prefixes.
if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix));
else if (GV->hasLinkerPrivateLinkage())
OutName.append(LinkerPrivatePrefix,
LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));;
OutName.append(Prefix, Prefix+strlen(Prefix));
// Get the ID for the global, assigning a new one if we haven't got one
// already.
unsigned &ID = AnonGlobalIDs[GV];
if (ID == 0) ID = NextAnonGlobalID++;
// Must mangle the global into a unique ID.
raw_svector_ostream(OutName) << "__unnamed_" << ID;
}
/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
/// and the specified global variable's name. If the global variable doesn't
/// have a name, this fills in a unique name for the global.
std::string Mangler::getNameWithPrefix(const GlobalValue *GV,
bool isImplicitlyPrivate) {
SmallString<64> Buf;
getNameWithPrefix(Buf, GV, isImplicitlyPrivate);
return std::string(Buf.begin(), Buf.end());
}
Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix,
const char *linkerPrivatePrefix)
: Prefix(prefix), PrivatePrefix(privatePrefix),
LinkerPrivatePrefix(linkerPrivatePrefix), NextAnonGlobalID(1) {
}
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