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83 lines
2.9 KiB
C++
83 lines
2.9 KiB
C++
//===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
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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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/// makeNameProper - We don't want identifier names with ., space, or
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/// - in them, so we mangle these characters into the strings "d_",
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/// "s_", and "D_", respectively.
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///
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std::string Mangler::makeNameProper(const std::string &x) {
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std::string tmp;
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for (std::string::const_iterator sI = x.begin(), sEnd = x.end();
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sI != sEnd; sI++)
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switch (*sI) {
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case '.': tmp += "d_"; break;
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case ' ': tmp += "s_"; break;
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case '-': tmp += "D_"; break;
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default: tmp += *sI;
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}
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return tmp;
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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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