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Header files will be on the way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9298 91177308-0d34-0410-b5e6-96231b3b80d8
102 lines
3.6 KiB
C++
102 lines
3.6 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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 CWriter and assembly backends.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Mangler.h"
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#include "llvm/Module.h"
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#include "llvm/Type.h"
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#include "Support/StringExtras.h"
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static char HexDigit(int V) {
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return V < 10 ? V+'0' : V+'A'-10;
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}
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static std::string MangleLetter(unsigned char C) {
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return std::string("_")+HexDigit(C >> 4) + HexDigit(C & 15) + "_";
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}
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/// makeNameProper - We don't want identifier names non-C-identifier characters
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/// in them, so mangle them as appropriate.
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///
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std::string Mangler::makeNameProper(const std::string &X) {
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std::string Result;
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// Mangle the first letter specially, don't allow numbers...
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if ((X[0] < 'a' || X[0] > 'z') && (X[0] < 'A' || X[0] > 'Z') && X[0] != '_')
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Result += MangleLetter(X[0]);
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else
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Result += X[0];
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for (std::string::const_iterator I = X.begin()+1, E = X.end(); I != E; ++I)
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if ((*I < 'a' || *I > 'z') && (*I < 'A' || *I > 'Z') &&
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(*I < '0' || *I > '9') && *I != '_')
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Result += MangleLetter(*I);
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else
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Result += *I;
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return Result;
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}
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std::string Mangler::getValueName(const Value *V) {
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// Check to see whether we've already named V.
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ValueMap::iterator VI = Memo.find(V);
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if (VI != Memo.end()) {
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return VI->second; // Return the old name for V.
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}
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std::string name;
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if (V->hasName()) { // Print out the label if it exists...
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// Name mangling occurs as follows:
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// - If V is not a global, mangling always occurs.
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// - Otherwise, mangling occurs when any of the following are true:
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// 1) V has internal linkage
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// 2) V's name would collide if it is not mangled.
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//
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const GlobalValue* gv = dyn_cast<GlobalValue>(V);
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if (gv && !gv->hasInternalLinkage() && !MangledGlobals.count(gv)) {
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name = makeNameProper(gv->getName());
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if (AddUnderscorePrefix) name = "_" + name;
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} else {
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// Non-global, or global with internal linkage / colliding name
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// -> mangle.
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name = "l" + utostr(V->getType()->getUniqueID()) + "_" +
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makeNameProper(V->getName());
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}
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} else {
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name = "ltmp_" + utostr(Count++) + "_"
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+ utostr(V->getType()->getUniqueID());
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}
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Memo[V] = name;
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return name;
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}
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Mangler::Mangler(Module &m, bool addUnderscorePrefix)
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: M(m), AddUnderscorePrefix(addUnderscorePrefix) {
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// Calculate which global values have names that will collide when we throw
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// away type information.
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std::set<std::string> FoundNames;
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (I->hasName()) // If the global has a name...
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if (FoundNames.count(I->getName())) // And the name is already used
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MangledGlobals.insert(I); // Mangle the name
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else
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FoundNames.insert(I->getName()); // Otherwise, keep track of name
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for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
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if (I->hasName()) // If the global has a name...
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if (FoundNames.count(I->getName())) // And the name is already used
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MangledGlobals.insert(I); // Mangle the name
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else
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FoundNames.insert(I->getName()); // Otherwise, keep track of name
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}
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