//===----------------------------------------------------------------------===//
#include "llvm/Target/Mangler.h"
-#include "llvm/GlobalValue.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Function.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
+static bool isAcceptableChar(char C, bool AllowPeriod, bool AllowUTF8) {
+ if ((C < 'a' || C > 'z') &&
+ (C < 'A' || C > 'Z') &&
+ (C < '0' || C > '9') &&
+ C != '_' && C != '$' && C != '@' &&
+ !(AllowPeriod && C == '.') &&
+ !(AllowUTF8 && (C & 0x80)))
+ return false;
+ return true;
+}
+
+static char HexDigit(int V) {
+ return V < 10 ? V+'0' : V+'A'-10;
+}
+
+static void MangleLetter(SmallVectorImpl<char> &OutName, unsigned char C) {
+ OutName.push_back('_');
+ OutName.push_back(HexDigit(C >> 4));
+ OutName.push_back(HexDigit(C & 15));
+ OutName.push_back('_');
+}
+
+/// NameNeedsEscaping - Return true if the identifier \p Str needs quotes
+/// for this assembler.
+static bool NameNeedsEscaping(StringRef Str, const MCAsmInfo &MAI) {
+ assert(!Str.empty() && "Cannot create an empty MCSymbol");
+
+ // If the first character is a number and the target does not allow this, we
+ // need quotes.
+ if (!MAI.doesAllowNameToStartWithDigit() && Str[0] >= '0' && Str[0] <= '9')
+ return true;
+
+ // If any of the characters in the string is an unacceptable character, force
+ // quotes.
+ bool AllowPeriod = MAI.doesAllowPeriodsInName();
+ bool AllowUTF8 = MAI.doesAllowUTF8();
+ for (unsigned i = 0, e = Str.size(); i != e; ++i)
+ if (!isAcceptableChar(Str[i], AllowPeriod, AllowUTF8))
+ return true;
+ return false;
+}
+
+/// appendMangledName - Add the specified string in mangled form if it uses
+/// any unusual characters.
+static void appendMangledName(SmallVectorImpl<char> &OutName, StringRef Str,
+ const MCAsmInfo &MAI) {
+ // The first character is not allowed to be a number unless the target
+ // explicitly allows it.
+ if (!MAI.doesAllowNameToStartWithDigit() && Str[0] >= '0' && Str[0] <= '9') {
+ MangleLetter(OutName, Str[0]);
+ Str = Str.substr(1);
+ }
+
+ bool AllowPeriod = MAI.doesAllowPeriodsInName();
+ bool AllowUTF8 = MAI.doesAllowUTF8();
+ for (unsigned i = 0, e = Str.size(); i != e; ++i) {
+ if (!isAcceptableChar(Str[i], AllowPeriod, AllowUTF8))
+ MangleLetter(OutName, Str[i]);
+ else
+ OutName.push_back(Str[i]);
+ }
+}
+
+
+/// appendMangledQuotedName - On systems that support quoted symbols, we still
+/// have to escape some (obscure) characters like " and \n which would break the
+/// assembler's lexing.
+static void appendMangledQuotedName(SmallVectorImpl<char> &OutName,
+ StringRef Str) {
+ for (unsigned i = 0, e = Str.size(); i != e; ++i) {
+ if (Str[i] == '"' || Str[i] == '\n')
+ MangleLetter(OutName, Str[i]);
+ else
+ OutName.push_back(Str[i]);
+ }
+}
+
+
/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
/// and the specified name as the global variable name. GVName must not be
/// empty.
StringRef Name = GVName.toStringRef(TmpData);
assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
+ const MCAsmInfo &MAI = Context.getAsmInfo();
+
// If the global name is not led with \1, add the appropriate prefixes.
- if (Name[0] != '\1') {
- if (PrefixTy == Mangler::Private)
- OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix));
- else if (PrefixTy == Mangler::LinkerPrivate)
- OutName.append(LinkerPrivatePrefix,
- LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));
-
+ if (Name[0] == '\1') {
+ Name = Name.substr(1);
+ } else {
+ if (PrefixTy == Mangler::Private) {
+ const char *Prefix = MAI.getPrivateGlobalPrefix();
+ OutName.append(Prefix, Prefix+strlen(Prefix));
+ } else if (PrefixTy == Mangler::LinkerPrivate) {
+ const char *Prefix = MAI.getLinkerPrivateGlobalPrefix();
+ OutName.append(Prefix, Prefix+strlen(Prefix));
+ }
+
+ const char *Prefix = MAI.getGlobalPrefix();
if (Prefix[0] == 0)
; // Common noop, no prefix.
else if (Prefix[1] == 0)
OutName.push_back(Prefix[0]); // Common, one character prefix.
else
- OutName.append(Prefix, Prefix+strlen(Prefix)); // Arbitrary prefix.
- } else {
- Name = Name.substr(1);
+ OutName.append(Prefix, Prefix+strlen(Prefix)); // Arbitrary length prefix.
+ }
+
+ // If this is a simple string that doesn't need escaping, just append it.
+ if (!NameNeedsEscaping(Name, MAI) ||
+ // If quotes are supported, they can be used unless the string contains
+ // a quote or newline.
+ (MAI.doesAllowQuotesInName() &&
+ Name.find_first_of("\n\"") == StringRef::npos)) {
+ OutName.append(Name.begin(), Name.end());
+ return;
+ }
+
+ // On systems that do not allow quoted names, we need to mangle most
+ // strange characters.
+ if (!MAI.doesAllowQuotesInName())
+ return appendMangledName(OutName, Name, MAI);
+
+ // Okay, the system allows quoted strings. We can quote most anything, the
+ // only characters that need escaping are " and \n.
+ assert(Name.find_first_of("\n\"") != StringRef::npos);
+ return appendMangledQuotedName(OutName, Name);
+}
+
+/// AddFastCallStdCallSuffix - Microsoft fastcall and stdcall functions require
+/// a suffix on their name indicating the number of words of arguments they
+/// take.
+static void AddFastCallStdCallSuffix(SmallVectorImpl<char> &OutName,
+ const Function *F, const DataLayout &TD) {
+ // Calculate arguments size total.
+ unsigned ArgWords = 0;
+ for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
+ AI != AE; ++AI) {
+ Type *Ty = AI->getType();
+ // 'Dereference' type in case of byval parameter attribute
+ if (AI->hasByValAttr())
+ Ty = cast<PointerType>(Ty)->getElementType();
+ // Size should be aligned to DWORD boundary
+ ArgWords += ((TD.getTypeAllocSize(Ty) + 3)/4)*4;
}
- OutName.append(Name.begin(), Name.end());
+ raw_svector_ostream(OutName) << '@' << ArgWords;
}
void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
const GlobalValue *GV,
bool isImplicitlyPrivate) {
+ ManglerPrefixTy PrefixTy = Mangler::Default;
+ if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
+ PrefixTy = Mangler::Private;
+ else if (GV->hasLinkerPrivateLinkage() || GV->hasLinkerPrivateWeakLinkage())
+ PrefixTy = Mangler::LinkerPrivate;
+
// If this global has a name, handle it simply.
if (GV->hasName()) {
- ManglerPrefixTy PrefixTy = Mangler::Default;
- if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
- PrefixTy = Mangler::Private;
- else if (GV->hasLinkerPrivateLinkage())
- PrefixTy = Mangler::LinkerPrivate;
-
- return getNameWithPrefix(OutName, GV->getName(), PrefixTy);
- }
-
- // If the global variable doesn't have a name, return a unique name for the
- // global based on a numbering.
-
- // Anonymous names always get prefixes.
- if (GV->hasPrivateLinkage() || isImplicitlyPrivate)
- OutName.append(PrivatePrefix, PrivatePrefix+strlen(PrivatePrefix));
- else if (GV->hasLinkerPrivateLinkage())
- OutName.append(LinkerPrivatePrefix,
- LinkerPrivatePrefix+strlen(LinkerPrivatePrefix));;
- OutName.append(Prefix, Prefix+strlen(Prefix));
+ StringRef Name = GV->getName();
+ getNameWithPrefix(OutName, Name, PrefixTy);
+ // No need to do anything else if the global has the special "do not mangle"
+ // flag in the name.
+ if (Name[0] == 1)
+ return;
+ } else {
+ // Get the ID for the global, assigning a new one if we haven't got one
+ // already.
+ unsigned &ID = AnonGlobalIDs[GV];
+ if (ID == 0) ID = NextAnonGlobalID++;
- // Get the ID for the global, assigning a new one if we haven't got one
- // already.
- unsigned &ID = AnonGlobalIDs[GV];
- if (ID == 0) ID = NextAnonGlobalID++;
+ // Must mangle the global into a unique ID.
+ getNameWithPrefix(OutName, "__unnamed_" + Twine(ID), PrefixTy);
+ }
- // Must mangle the global into a unique ID.
- raw_svector_ostream(OutName) << "__unnamed_" << ID;
+ // If we are supposed to add a microsoft-style suffix for stdcall/fastcall,
+ // add it.
+ if (Context.getAsmInfo().hasMicrosoftFastStdCallMangling()) {
+ if (const Function *F = dyn_cast<Function>(GV)) {
+ CallingConv::ID CC = F->getCallingConv();
+
+ // fastcall functions need to start with @.
+ // FIXME: This logic seems unlikely to be right.
+ if (CC == CallingConv::X86_FastCall) {
+ if (OutName[0] == '_')
+ OutName[0] = '@';
+ else
+ OutName.insert(OutName.begin(), '@');
+ }
+
+ // fastcall and stdcall functions usually need @42 at the end to specify
+ // the argument info.
+ FunctionType *FT = F->getFunctionType();
+ if ((CC == CallingConv::X86_FastCall || CC == CallingConv::X86_StdCall) &&
+ // "Pure" variadic functions do not receive @0 suffix.
+ (!FT->isVarArg() || FT->getNumParams() == 0 ||
+ (FT->getNumParams() == 1 && F->hasStructRetAttr())))
+ AddFastCallStdCallSuffix(OutName, F, *TM->getDataLayout());
+ }
+ }
}
-/// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
-/// and the specified global variable's name. If the global variable doesn't
-/// have a name, this fills in a unique name for the global.
-std::string Mangler::getNameWithPrefix(const GlobalValue *GV,
- bool isImplicitlyPrivate) {
- SmallString<64> Buf;
- getNameWithPrefix(Buf, GV, isImplicitlyPrivate);
- return std::string(Buf.begin(), Buf.end());
+/// getSymbol - Return the MCSymbol for the specified global value. This
+/// symbol is the main label that is the address of the global.
+MCSymbol *Mangler::getSymbol(const GlobalValue *GV) {
+ SmallString<60> NameStr;
+ getNameWithPrefix(NameStr, GV, false);
+ return Context.GetOrCreateSymbol(NameStr.str());
}
-
-Mangler::Mangler(Module &M, const char *prefix, const char *privatePrefix,
- const char *linkerPrivatePrefix)
- : Prefix(prefix), PrivatePrefix(privatePrefix),
- LinkerPrivatePrefix(linkerPrivatePrefix), NextAnonGlobalID(1) {
-}
+
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