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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82454 91177308-0d34-0410-b5e6-96231b3b80d8
228 lines
7.0 KiB
C++
228 lines
7.0 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 is distributed under the University of Illinois Open Source
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// 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/Function.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/raw_ostream.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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char Result[] = { '_', HexDigit(C >> 4), HexDigit(C & 15), '_', 0 };
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return Result;
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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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ManglerPrefixTy PrefixTy) {
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assert(!X.empty() && "Cannot mangle empty strings");
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if (!UseQuotes) {
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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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bool NeedPrefix = true;
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std::string::const_iterator I = X.begin();
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if (*I == 1) {
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NeedPrefix = false;
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++I; // Skip over the marker.
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}
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// Mangle the first letter specially, don't allow numbers unless the target
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// explicitly allows them.
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if (!SymbolsCanStartWithDigit && *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 (!isCharAcceptable(*I))
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Result += MangleLetter(*I);
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else
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Result += *I;
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}
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if (NeedPrefix) {
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Result = Prefix + Result;
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if (PrefixTy == Mangler::Private)
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Result = PrivatePrefix + Result;
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else if (PrefixTy == Mangler::LinkerPrivate)
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Result = LinkerPrivatePrefix + Result;
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}
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return Result;
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}
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bool NeedPrefix = true;
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bool NeedQuotes = false;
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std::string Result;
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std::string::const_iterator I = X.begin();
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if (*I == 1) {
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NeedPrefix = false;
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++I; // Skip over the marker.
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}
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// If the first character is a number, we need quotes.
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if (*I >= '0' && *I <= '9')
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NeedQuotes = true;
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// Do an initial scan of the string, checking to see if we need quotes or
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// to escape a '"' or not.
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if (!NeedQuotes)
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for (std::string::const_iterator E = X.end(); I != E; ++I)
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if (!isCharAcceptable(*I)) {
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NeedQuotes = true;
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break;
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}
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// In the common case, we don't need quotes. Handle this quickly.
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if (!NeedQuotes) {
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if (!NeedPrefix)
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return X.substr(1); // Strip off the \001.
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Result = Prefix + X;
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if (PrefixTy == Mangler::Private)
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Result = PrivatePrefix + Result;
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else if (PrefixTy == Mangler::LinkerPrivate)
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Result = LinkerPrivatePrefix + Result;
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return Result;
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}
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if (NeedPrefix)
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Result = X.substr(0, I-X.begin());
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// Otherwise, construct the string the expensive way.
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for (std::string::const_iterator E = X.end(); I != E; ++I) {
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if (*I == '"')
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Result += "_QQ_";
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else if (*I == '\n')
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Result += "_NL_";
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else
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Result += *I;
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}
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if (NeedPrefix) {
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Result = Prefix + Result;
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if (PrefixTy == Mangler::Private)
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Result = PrivatePrefix + Result;
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else if (PrefixTy == Mangler::LinkerPrivate)
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Result = LinkerPrivatePrefix + Result;
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}
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Result = '"' + Result + '"';
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return Result;
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}
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/// getMangledName - Returns the mangled name of V, an LLVM Value,
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/// in the current module. If 'Suffix' is specified, the name ends with the
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/// specified suffix. If 'ForcePrivate' is specified, the label is specified
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/// to have a private label prefix.
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///
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std::string Mangler::getMangledName(const GlobalValue *GV, const char *Suffix,
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bool ForcePrivate) {
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assert((!isa<Function>(GV) || !cast<Function>(GV)->isIntrinsic()) &&
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"Intrinsic functions cannot be mangled by Mangler");
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ManglerPrefixTy PrefixTy =
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(GV->hasPrivateLinkage() || ForcePrivate) ? Mangler::Private :
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GV->hasLinkerPrivateLinkage() ? Mangler::LinkerPrivate : Mangler::Default;
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if (GV->hasName())
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return makeNameProper(GV->getNameStr() + Suffix, PrefixTy);
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// Get the ID for the global, assigning a new one if we haven't got one
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// already.
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unsigned &ID = AnonGlobalIDs[GV];
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if (ID == 0) ID = NextAnonGlobalID++;
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// Must mangle the global into a unique ID.
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return makeNameProper("__unnamed_" + utostr(ID) + Suffix, PrefixTy);
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}
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/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
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/// and the specified global variable's name. If the global variable doesn't
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/// have a name, this fills in a unique name for the global.
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void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
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const GlobalValue *GV,
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bool isImplicitlyPrivate) {
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// If the global is anonymous or not led with \1, then add the appropriate
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// prefix.
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if (!GV->hasName() || GV->getName()[0] != '\1') {
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if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
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OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix));
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else if (GV->hasLinkerPrivateLinkage())
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OutName.append(LinkerPrivatePrefix,
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LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));;
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OutName.append(Prefix, Prefix+strlen(Prefix));
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}
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// If the global has a name, just append it now.
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if (GV->hasName()) {
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StringRef Name = GV->getName();
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// Strip off the prefix marker if present.
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if (Name[0] != '\1')
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OutName.append(Name.begin(), Name.end());
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else
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OutName.append(Name.begin()+1, Name.end());
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return;
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}
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// If the global variable doesn't have a name, return a unique name for the
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// global based on a numbering.
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// Get the ID for the global, assigning a new one if we haven't got one
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// already.
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unsigned &ID = AnonGlobalIDs[GV];
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if (ID == 0) ID = NextAnonGlobalID++;
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// Must mangle the global into a unique ID.
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raw_svector_ostream(OutName) << "__unnamed_" << ID;
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}
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Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix,
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const char *linkerPrivatePrefix)
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: Prefix(prefix), PrivatePrefix(privatePrefix),
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LinkerPrivatePrefix(linkerPrivatePrefix), UseQuotes(false),
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SymbolsCanStartWithDigit(false), NextAnonGlobalID(1) {
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std::fill(AcceptableChars, array_endof(AcceptableChars), 0);
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// Letters and numbers are acceptable.
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for (unsigned char X = 'a'; X <= 'z'; ++X)
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markCharAcceptable(X);
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for (unsigned char X = 'A'; X <= 'Z'; ++X)
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markCharAcceptable(X);
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for (unsigned char X = '0'; X <= '9'; ++X)
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markCharAcceptable(X);
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// These chars are acceptable.
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markCharAcceptable('_');
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markCharAcceptable('$');
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markCharAcceptable('.');
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markCharAcceptable('@');
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}
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