X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;ds=sidebyside;f=lib%2FVMCore%2FMangler.cpp;h=44cf77826629546e4c35d25d9c92824ed575ad56;hb=61466c50df9d00c4a07b1fd72536399cfb418ebd;hp=0847604b8f866807190dd0be6a89165f11c265e2;hpb=fd93908ae8b9684fe71c239e3c6cfe13ff6a2663;p=oota-llvm.git diff --git a/lib/VMCore/Mangler.cpp b/lib/VMCore/Mangler.cpp index 0847604b8f8..44cf7782662 100644 --- a/lib/VMCore/Mangler.cpp +++ b/lib/VMCore/Mangler.cpp @@ -2,8 +2,8 @@ // // The LLVM Compiler Infrastructure // -// This file was developed by the LLVM research group and is distributed under -// the University of Illinois Open Source License. See LICENSE.TXT for details. +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // @@ -12,9 +12,11 @@ //===----------------------------------------------------------------------===// #include "llvm/Support/Mangler.h" +#include "llvm/DerivedTypes.h" #include "llvm/Module.h" -#include "llvm/Type.h" +#include "llvm/ADT/STLExtras.h" #include "llvm/ADT/StringExtras.h" +#include "llvm/ADT/StringMap.h" using namespace llvm; static char HexDigit(int V) { @@ -22,105 +24,156 @@ static char HexDigit(int V) { } static std::string MangleLetter(unsigned char C) { - return std::string("_")+HexDigit(C >> 4) + HexDigit(C & 15) + "_"; + char Result[] = { '_', HexDigit(C >> 4), HexDigit(C & 15), '_', 0 }; + return Result; } /// makeNameProper - We don't want identifier names non-C-identifier characters /// in them, so mangle them as appropriate. /// -std::string Mangler::makeNameProper(const std::string &X) { - std::string Result; - - // Mangle the first letter specially, don't allow numbers... - if ((X[0] < 'a' || X[0] > 'z') && (X[0] < 'A' || X[0] > 'Z') && X[0] != '_') - Result += MangleLetter(X[0]); - else - Result += X[0]; - - for (std::string::const_iterator I = X.begin()+1, E = X.end(); I != E; ++I) - if ((*I < 'a' || *I > 'z') && (*I < 'A' || *I > 'Z') && - (*I < '0' || *I > '9') && *I != '_') - Result += MangleLetter(*I); - else - Result += *I; - return Result; -} +std::string Mangler::makeNameProper(const std::string &X, + ManglerPrefixTy PrefixTy) { + assert(!X.empty() && "Cannot mangle empty strings"); + + if (!UseQuotes) { + std::string Result; -/// getTypeID - Return a unique ID for the specified LLVM type. -/// -unsigned Mangler::getTypeID(const Type *Ty) { - unsigned &E = TypeMap[Ty]; - if (E == 0) E = ++TypeCounter; - return E; -} + // If X does not start with (char)1, add the prefix. + bool NeedPrefix = true; + std::string::const_iterator I = X.begin(); + if (*I == 1) { + NeedPrefix = false; + ++I; // Skip over the marker. + } + + // Mangle the first letter specially, don't allow numbers. + if (*I >= '0' && *I <= '9') + Result += MangleLetter(*I++); + for (std::string::const_iterator E = X.end(); I != E; ++I) { + if (!isCharAcceptable(*I)) + Result += MangleLetter(*I); + else + Result += *I; + } -std::string Mangler::getValueName(const Value *V) { - // Check to see whether we've already named V. - ValueMap::iterator VI = Memo.find(V); - if (VI != Memo.end()) { - return VI->second; // Return the old name for V. - } + if (NeedPrefix) { + Result = Prefix + Result; - std::string name; - if (V->hasName()) { // Print out the label if it exists... - // Name mangling occurs as follows: - // - If V is an intrinsic function, do not change name at all - // - If V is not a global, mangling always occurs. - // - Otherwise, mangling occurs when any of the following are true: - // 1) V has internal linkage - // 2) V's name would collide if it is not mangled. - // - const GlobalValue* gv = dyn_cast(V); - if (gv && isa(gv) && cast(gv)->getIntrinsicID()) { - name = gv->getName(); // Is an intrinsic function - } else if (gv && !gv->hasInternalLinkage() && !MangledGlobals.count(gv)) { - name = Prefix + makeNameProper(gv->getName()); - } else { - // Non-global, or global with internal linkage / colliding name - // -> mangle. - unsigned TypeUniqueID = getTypeID(V->getType()); - name = "l" + utostr(TypeUniqueID) + "_" + makeNameProper(V->getName()); + if (PrefixTy == Mangler::Private) + Result = PrivatePrefix + Result; + else if (PrefixTy == Mangler::LinkerPrivate) + Result = LinkerPrivatePrefix + Result; } - } else { - name = "ltmp_" + utostr(Count++) + "_" + utostr(getTypeID(V->getType())); + + return Result; } - Memo[V] = name; - return name; -} + bool NeedPrefix = true; + bool NeedQuotes = false; + std::string Result; + std::string::const_iterator I = X.begin(); + if (*I == 1) { + NeedPrefix = false; + ++I; // Skip over the marker. + } + + // If the first character is a number, we need quotes. + if (*I >= '0' && *I <= '9') + NeedQuotes = true; + + // Do an initial scan of the string, checking to see if we need quotes or + // to escape a '"' or not. + if (!NeedQuotes) + for (std::string::const_iterator E = X.end(); I != E; ++I) + if (!isCharAcceptable(*I)) { + NeedQuotes = true; + break; + } + + // In the common case, we don't need quotes. Handle this quickly. + if (!NeedQuotes) { + if (!NeedPrefix) + return X.substr(1); // Strip off the \001. + + Result = Prefix + X; -void Mangler::InsertName(GlobalValue *GV, - std::map &Names) { - if (!GV->hasName()) { // We must mangle unnamed globals. - MangledGlobals.insert(GV); - return; + if (PrefixTy == Mangler::Private) + Result = PrivatePrefix + Result; + else if (PrefixTy == Mangler::LinkerPrivate) + Result = LinkerPrivatePrefix + Result; + + return Result; + } + + Result = X.substr(0, I-X.begin()); + + // Otherwise, construct the string the expensive way. + for (std::string::const_iterator E = X.end(); I != E; ++I) { + if (*I == '"') + Result += "_QQ_"; + else if (*I == '\n') + Result += "_NL_"; + else + Result += *I; } - // Figure out if this is already used. - GlobalValue *&ExistingValue = Names[GV->getName()]; - if (!ExistingValue) { - ExistingValue = GV; - } else { - // If GV is external but the existing one is static, mangle the existing one - if (GV->hasExternalLinkage() && !ExistingValue->hasExternalLinkage()) { - MangledGlobals.insert(ExistingValue); - ExistingValue = GV; - } else { - // Otherwise, mangle GV - MangledGlobals.insert(GV); - } + if (NeedPrefix) { + Result = Prefix + Result; + + if (PrefixTy == Mangler::Private) + Result = PrivatePrefix + Result; + else if (PrefixTy == Mangler::LinkerPrivate) + Result = LinkerPrivatePrefix + Result; } + + Result = '"' + Result + '"'; + return Result; +} + +/// getMangledName - Returns the mangled name of V, an LLVM Value, +/// in the current module. If 'Suffix' is specified, the name ends with the +/// specified suffix. If 'ForcePrivate' is specified, the label is specified +/// to have a private label prefix. +/// +std::string Mangler::getMangledName(const GlobalValue *GV, const char *Suffix, + bool ForcePrivate) { + assert((!isa(GV) || !cast(GV)->isIntrinsic()) && + "Intrinsic functions cannot be mangled by Mangler"); + + ManglerPrefixTy PrefixTy = + (GV->hasPrivateLinkage() || ForcePrivate) ? Mangler::Private : + GV->hasLinkerPrivateLinkage() ? Mangler::LinkerPrivate : Mangler::Default; + + if (GV->hasName()) + return makeNameProper(GV->getNameStr() + Suffix, PrefixTy); + + // 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. + return makeNameProper("__unnamed_" + utostr(ID) + Suffix, PrefixTy); } +Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix, + const char *linkerPrivatePrefix) + : Prefix(prefix), PrivatePrefix(privatePrefix), + LinkerPrivatePrefix(linkerPrivatePrefix), UseQuotes(false), + NextAnonGlobalID(1) { + std::fill(AcceptableChars, array_endof(AcceptableChars), 0); -Mangler::Mangler(Module &m, const char *prefix) - : M(m), Prefix(prefix), TypeCounter(0), Count(0) { - // Calculate which global values have names that will collide when we throw - // away type information. - std::map Names; - for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) - InsertName(I, Names); - for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I) - InsertName(I, Names); + // Letters and numbers are acceptable. + for (unsigned char X = 'a'; X <= 'z'; ++X) + markCharAcceptable(X); + for (unsigned char X = 'A'; X <= 'Z'; ++X) + markCharAcceptable(X); + for (unsigned char X = '0'; X <= '9'; ++X) + markCharAcceptable(X); + + // These chars are acceptable. + markCharAcceptable('_'); + markCharAcceptable('$'); + markCharAcceptable('.'); }