//===-- 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 CWriter and assembly backends.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/Mangler.h"
-#include "llvm/Module.h"
-#include "llvm/Type.h"
-#include "Support/StringExtras.h"
+#include "llvm/Function.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
static char HexDigit(int V) {
return V < 10 ? V+'0' : V+'A'-10;
}
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;
+///
+std::string Mangler::makeNameProper(const std::string &X,
+ ManglerPrefixTy PrefixTy) {
+ assert(!X.empty() && "Cannot mangle empty strings");
- // 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);
+ if (!UseQuotes) {
+ std::string Result;
+
+ // 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 unless the target
+ // explicitly allows them.
+ if (!SymbolsCanStartWithDigit && *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;
+ }
+
+ if (NeedPrefix) {
+ Result = Prefix + Result;
+
+ if (PrefixTy == Mangler::Private)
+ Result = PrivatePrefix + Result;
+ else if (PrefixTy == Mangler::LinkerPrivate)
+ Result = LinkerPrivatePrefix + Result;
+ }
+
+ return Result;
+ }
+
+ 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;
+
+ if (PrefixTy == Mangler::Private)
+ Result = PrivatePrefix + Result;
+ else if (PrefixTy == Mangler::LinkerPrivate)
+ Result = LinkerPrivatePrefix + Result;
+
+ return Result;
+ }
+
+ if (NeedPrefix)
+ 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;
+ }
+
+ if (NeedPrefix) {
+ Result = Prefix + Result;
+
+ if (PrefixTy == Mangler::Private)
+ Result = PrivatePrefix + Result;
+ else if (PrefixTy == Mangler::LinkerPrivate)
+ Result = LinkerPrivatePrefix + Result;
+ }
+
+ Result = '"' + Result + '"';
return Result;
}
-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.
+/// 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<Function>(GV) || !cast<Function>(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);
+}
+
+
+/// 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 the global is anonymous or not led with \1, then add the appropriate
+ // prefix.
+ if (!GV->hasName() || GV->getName()[0] != '\1') {
+ 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));
}
- std::string name;
- if (V->hasName()) { // Print out the label if it exists...
- // Name mangling occurs as follows:
- // - 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<GlobalValue>(V);
- if (gv && !gv->hasInternalLinkage() && !MangledGlobals.count(gv)) {
- name = makeNameProper(gv->getName());
- if (AddUnderscorePrefix) name = "_" + name;
- } else {
- // Non-global, or global with internal linkage / colliding name
- // -> mangle.
- name = "l" + utostr(V->getType()->getUniqueID()) + "_" +
- makeNameProper(V->getName());
- }
- } else {
- name = "ltmp_" + utostr(Count++) + "_"
- + utostr(V->getType()->getUniqueID());
+ // If the global has a name, just append it now.
+ if (GV->hasName()) {
+ StringRef Name = GV->getName();
+
+ // Strip off the prefix marker if present.
+ if (Name[0] != '\1')
+ OutName.append(Name.begin(), Name.end());
+ else
+ OutName.append(Name.begin()+1, Name.end());
+ return;
}
- Memo[V] = name;
- return name;
+ // If the global variable doesn't have a name, return a unique name for the
+ // global based on a numbering.
+
+ // 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;
}
-Mangler::Mangler(Module &m, bool addUnderscorePrefix)
- : M(m), AddUnderscorePrefix(addUnderscorePrefix) {
- // Calculate which global values have names that will collide when we throw
- // away type information.
- std::set<std::string> FoundNames;
- for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
- if (I->hasName()) // If the global has a name...
- if (FoundNames.count(I->getName())) // And the name is already used
- MangledGlobals.insert(I); // Mangle the name
- else
- FoundNames.insert(I->getName()); // Otherwise, keep track of name
- for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
- if (I->hasName()) // If the global has a name...
- if (FoundNames.count(I->getName())) // And the name is already used
- MangledGlobals.insert(I); // Mangle the name
- else
- FoundNames.insert(I->getName()); // Otherwise, keep track of name
-}
+Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix,
+ const char *linkerPrivatePrefix)
+ : Prefix(prefix), PrivatePrefix(privatePrefix),
+ LinkerPrivatePrefix(linkerPrivatePrefix), UseQuotes(false),
+ SymbolsCanStartWithDigit(false), NextAnonGlobalID(1) {
+ std::fill(AcceptableChars, array_endof(AcceptableChars), 0);
+ // 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('.');
+ markCharAcceptable('@');
+}
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