//===-- 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 <iostream>
-#include <set>
-#include <string>
-#include "llvm/Value.h"
-#include "llvm/Module.h"
-#include "llvm/Type.h"
-#include "Support/StringExtras.h"
#include "llvm/Support/Mangler.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
+using namespace llvm;
+
+static char HexDigit(int V) {
+ return V < 10 ? V+'0' : V+'A'-10;
+}
+
+static std::string MangleLetter(unsigned char C) {
+ 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, const char *Prefix) {
+ std::string Result;
+ if (X.empty()) return X; // Empty names are uniqued by the caller.
+
+ // If PreserveAsmNames is set, names with asm identifiers are not modified.
+ if (PreserveAsmNames && X[0] == 1)
+ return X;
+
+ if (!UseQuotes) {
+ // If X does not start with (char)1, add the prefix.
+ std::string::const_iterator I = X.begin();
+ if (*I != 1)
+ Result = Prefix;
+ else
+ ++I; // Skip over the marker.
+
+ // Mangle the first letter specially, don't allow numbers.
+ if (*I >= '0' && *I <= '9')
+ Result += MangleLetter(*I++);
-/// makeNameProper - We don't want identifier names with ., space, or
-/// - in them, so we mangle these characters into the strings "d_",
-/// "s_", and "D_", respectively.
-///
-std::string Mangler::makeNameProper(const std::string &x) {
- std::string tmp;
- for (std::string::const_iterator sI = x.begin(), sEnd = x.end();
- sI != sEnd; sI++)
- switch (*sI) {
- case '.': tmp += "d_"; break;
- case ' ': tmp += "s_"; break;
- case '-': tmp += "D_"; break;
- default: tmp += *sI;
+ for (std::string::const_iterator E = X.end(); I != E; ++I) {
+ if (!isCharAcceptable(*I))
+ Result += MangleLetter(*I);
+ else
+ Result += *I;
+ }
+ } else {
+ bool NeedsQuotes = false;
+
+ std::string::const_iterator I = X.begin();
+ if (*I == 1)
+ ++I; // Skip over the marker.
+
+ // If the first character is a number, we need quotes.
+ if (*I >= '0' && *I <= '9')
+ NeedsQuotes = true;
+
+ // Do an initial scan of the string, checking to see if we need quotes or
+ // to escape a '"' or not.
+ if (!NeedsQuotes)
+ for (std::string::const_iterator E = X.end(); I != E; ++I)
+ if (!isCharAcceptable(*I)) {
+ NeedsQuotes = true;
+ break;
+ }
+
+ // In the common case, we don't need quotes. Handle this quickly.
+ if (!NeedsQuotes) {
+ if (*X.begin() != 1)
+ return Prefix+X;
+ else
+ return X.substr(1);
+ }
+
+ // Otherwise, construct the string the expensive way.
+ I = X.begin();
+
+ // If X does not start with (char)1, add the prefix.
+ if (*I != 1)
+ Result = Prefix;
+ else
+ ++I; // Skip the marker if present.
+
+ for (std::string::const_iterator E = X.end(); I != E; ++I) {
+ if (*I == '"')
+ Result += "_QQ_";
+ else if (*I == '\n')
+ Result += "_NL_";
+ else
+ Result += *I;
}
- return tmp;
+ Result = '"' + Result + '"';
+ }
+ return 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;
}
std::string Mangler::getValueName(const Value *V) {
+ if (const GlobalValue *GV = dyn_cast<GlobalValue>(V))
+ return getValueName(GV);
+
+ std::string &Name = Memo[V];
+ if (!Name.empty())
+ return Name; // Return the already-computed name for V.
+
+ // Always mangle local names.
+ Name = "ltmp_" + utostr(Count++) + "_" + utostr(getTypeID(V->getType()));
+ return Name;
+}
+
+
+std::string Mangler::getValueName(const GlobalValue *GV, const char * Suffix) {
// 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.
+ std::string &Name = Memo[GV];
+ if (!Name.empty())
+ return Name; // Return the already-computed name for V.
+
+ // Name mangling occurs as follows:
+ // - If V is an intrinsic function, do not change name at all
+ // - Otherwise, mangling occurs if global collides with existing name.
+ if (isa<Function>(GV) && cast<Function>(GV)->isIntrinsic()) {
+ Name = GV->getName(); // Is an intrinsic function
+ } else if (!GV->hasName()) {
+ // Must mangle the global into a unique ID.
+ unsigned TypeUniqueID = getTypeID(GV->getType());
+ static unsigned GlobalID = 0;
+ Name = "__unnamed_" + utostr(TypeUniqueID) + "_" + utostr(GlobalID++);
+ } else if (!MangledGlobals.count(GV)) {
+ Name = makeNameProper(GV->getName() + Suffix, Prefix);
+ } else {
+ unsigned TypeUniqueID = getTypeID(GV->getType());
+ Name = "l" + utostr(TypeUniqueID) + "_" + makeNameProper(GV->getName());
}
- 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());
+ return Name;
+}
+
+void Mangler::InsertName(GlobalValue *GV,
+ std::map<std::string, GlobalValue*> &Names) {
+ if (!GV->hasName()) // We must mangle unnamed globals.
+ return;
+
+ // 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() || GV->hasDLLImportLinkage()) &&
+ !(ExistingValue->hasExternalLinkage() || ExistingValue->hasDLLImportLinkage())) {
+ MangledGlobals.insert(ExistingValue);
+ ExistingValue = GV;
+ } else if ((GV->hasExternalLinkage() ||
+ GV->hasDLLImportLinkage()) &&
+ (ExistingValue->hasExternalLinkage() ||
+ ExistingValue->hasDLLImportLinkage()) &&
+ GV->isDeclaration() &&
+ ExistingValue->isDeclaration()) {
+ // If the two globals both have external inkage, and are both external,
+ // don't mangle either of them, we just have some silly type mismatch.
} else {
- // Non-global, or global with internal linkage / colliding name
- // -> mangle.
- name = "l" + utostr(V->getType()->getUniqueID()) + "_" +
- makeNameProper(V->getName());
+ // Otherwise, mangle GV
+ MangledGlobals.insert(GV);
}
- } else {
- name = "ltmp_" + utostr(Count++) + "_"
- + utostr(V->getType()->getUniqueID());
}
- Memo[V] = name;
- return name;
}
-Mangler::Mangler(Module &M_) : M(M_)
-{
+
+Mangler::Mangler(Module &M, const char *prefix)
+ : Prefix(prefix), UseQuotes(false), PreserveAsmNames(false),
+ Count(0), TypeCounter(0) {
+ 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('.');
+
// Calculate which global values have names that will collide when we throw
// away type information.
- std::set<std::string> FoundNames;
+ std::map<std::string, GlobalValue*> Names;
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
+ InsertName(I, Names);
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
+ InsertName(I, Names);
}
+// Cause this file to be linked in when Support/Mangler.h is #included
+DEFINING_FILE_FOR(Mangler)
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