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6e7e5fab70
Do not mangle internal global names that do not collide with anything.
This gives us strings that now look like this:
__2E_str_1: ; '.str_1'
.asciz "foo"
instead of this:
l1__2E_str_1: ; '.str_1'
.asciz "foo"
llvm-svn: 24277
131 lines
4.1 KiB
C++
131 lines
4.1 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/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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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, const char *Prefix) {
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std::string Result;
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// If X does not start with (char)1, add the prefix.
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std::string::const_iterator I = X.begin();
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if (*I != 1)
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Result = Prefix;
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else
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++I; // Skip over the marker.
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// Mangle the first letter specially, don't allow numbers...
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if (*I >= '0' && *I <= '9')
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Result += MangleLetter(*I++);
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for (std::string::const_iterator 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 != '_' && *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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/// getTypeID - Return a unique ID for the specified LLVM type.
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///
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unsigned Mangler::getTypeID(const Type *Ty) {
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unsigned &E = TypeMap[Ty];
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if (E == 0) E = ++TypeCounter;
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return E;
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}
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std::string Mangler::getValueName(const Value *V) {
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if (const GlobalValue *GV = dyn_cast<GlobalValue>(V))
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return getValueName(GV);
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std::string &Name = Memo[V];
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if (!Name.empty())
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return Name; // Return the already-computed name for V.
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// Always mangle local names.
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Name = "ltmp_" + utostr(Count++) + "_" + utostr(getTypeID(V->getType()));
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return Name;
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}
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std::string Mangler::getValueName(const GlobalValue *GV) {
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// Check to see whether we've already named V.
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std::string &Name = Memo[GV];
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if (!Name.empty())
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return Name; // Return the already-computed name for V.
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// Name mangling occurs as follows:
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// - If V is an intrinsic function, do not change name at all
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// - Otherwise, mangling occurs if global collides with existing name.
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if (isa<Function>(GV) && cast<Function>(GV)->getIntrinsicID()) {
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Name = GV->getName(); // Is an intrinsic function
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} else if (!MangledGlobals.count(GV)) {
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Name = makeNameProper(GV->getName(), Prefix);
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} else {
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unsigned TypeUniqueID = getTypeID(GV->getType());
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Name = "l" + utostr(TypeUniqueID) + "_" + makeNameProper(GV->getName());
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}
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return Name;
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}
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void Mangler::InsertName(GlobalValue *GV,
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std::map<std::string, GlobalValue*> &Names) {
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if (!GV->hasName()) { // We must mangle unnamed globals.
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MangledGlobals.insert(GV);
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return;
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}
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// Figure out if this is already used.
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GlobalValue *&ExistingValue = Names[GV->getName()];
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if (!ExistingValue) {
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ExistingValue = GV;
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} else {
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// If GV is external but the existing one is static, mangle the existing one
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if (GV->hasExternalLinkage() && !ExistingValue->hasExternalLinkage()) {
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MangledGlobals.insert(ExistingValue);
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ExistingValue = GV;
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} else {
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// Otherwise, mangle GV
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MangledGlobals.insert(GV);
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}
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}
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}
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Mangler::Mangler(Module &m, const char *prefix)
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: M(m), Prefix(prefix), TypeCounter(0), Count(0) {
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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::map<std::string, GlobalValue*> Names;
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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InsertName(I, Names);
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for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
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InsertName(I, Names);
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}
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