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This reverts commit r239437. This broke clang-cl self-hosts. We'd end up calling the __imp_ symbol directly instead of using it to do an indirect function call. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239502 91177308-0d34-0410-b5e6-96231b3b80d8
159 lines
5.4 KiB
C++
159 lines
5.4 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 assembly backends.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/Mangler.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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static void getNameWithPrefixx(raw_ostream &OS, const Twine &GVName,
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Mangler::ManglerPrefixTy PrefixTy,
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const DataLayout &DL, char Prefix) {
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SmallString<256> TmpData;
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StringRef Name = GVName.toStringRef(TmpData);
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assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
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// No need to do anything special if the global has the special "do not
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// mangle" flag in the name.
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if (Name[0] == '\1') {
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OS << Name.substr(1);
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return;
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}
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if (PrefixTy == Mangler::Private)
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OS << DL.getPrivateGlobalPrefix();
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else if (PrefixTy == Mangler::LinkerPrivate)
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OS << DL.getLinkerPrivateGlobalPrefix();
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if (Prefix != '\0')
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OS << Prefix;
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// If this is a simple string that doesn't need escaping, just append it.
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OS << Name;
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}
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void Mangler::getNameWithPrefix(raw_ostream &OS, const Twine &GVName,
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ManglerPrefixTy PrefixTy) const {
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char Prefix = DL->getGlobalPrefix();
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return getNameWithPrefixx(OS, GVName, PrefixTy, *DL, Prefix);
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}
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void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
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const Twine &GVName,
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ManglerPrefixTy PrefixTy) const {
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raw_svector_ostream OS(OutName);
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return getNameWithPrefix(OS, GVName, PrefixTy);
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}
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static bool hasByteCountSuffix(CallingConv::ID CC) {
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switch (CC) {
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case CallingConv::X86_FastCall:
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case CallingConv::X86_StdCall:
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case CallingConv::X86_VectorCall:
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return true;
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default:
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return false;
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}
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}
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/// Microsoft fastcall and stdcall functions require a suffix on their name
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/// indicating the number of words of arguments they take.
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static void addByteCountSuffix(raw_ostream &OS, const Function *F,
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const DataLayout &DL) {
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// Calculate arguments size total.
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unsigned ArgWords = 0;
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for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
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AI != AE; ++AI) {
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Type *Ty = AI->getType();
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// 'Dereference' type in case of byval or inalloca parameter attribute.
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if (AI->hasByValOrInAllocaAttr())
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Ty = cast<PointerType>(Ty)->getElementType();
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// Size should be aligned to pointer size.
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unsigned PtrSize = DL.getPointerSize();
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ArgWords += RoundUpToAlignment(DL.getTypeAllocSize(Ty), PtrSize);
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}
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OS << '@' << ArgWords;
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}
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void Mangler::getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV,
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bool CannotUsePrivateLabel) const {
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ManglerPrefixTy PrefixTy = Mangler::Default;
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if (GV->hasPrivateLinkage()) {
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if (CannotUsePrivateLabel)
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PrefixTy = Mangler::LinkerPrivate;
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else
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PrefixTy = Mangler::Private;
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}
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if (!GV->hasName()) {
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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)
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ID = NextAnonGlobalID++;
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// Must mangle the global into a unique ID.
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getNameWithPrefix(OS, "__unnamed_" + Twine(ID), PrefixTy);
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return;
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}
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StringRef Name = GV->getName();
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char Prefix = DL->getGlobalPrefix();
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// Mangle functions with Microsoft calling conventions specially. Only do
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// this mangling for x86_64 vectorcall and 32-bit x86.
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const Function *MSFunc = dyn_cast<Function>(GV);
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if (Name.startswith("\01"))
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MSFunc = nullptr; // Don't mangle when \01 is present.
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CallingConv::ID CC =
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MSFunc ? MSFunc->getCallingConv() : (unsigned)CallingConv::C;
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if (!DL->hasMicrosoftFastStdCallMangling() &&
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CC != CallingConv::X86_VectorCall)
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MSFunc = nullptr;
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if (MSFunc) {
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if (CC == CallingConv::X86_FastCall)
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Prefix = '@'; // fastcall functions have an @ prefix instead of _.
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else if (CC == CallingConv::X86_VectorCall)
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Prefix = '\0'; // vectorcall functions have no prefix.
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}
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getNameWithPrefixx(OS, Name, PrefixTy, *DL, Prefix);
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if (!MSFunc)
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return;
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// If we are supposed to add a microsoft-style suffix for stdcall, fastcall,
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// or vectorcall, add it. These functions have a suffix of @N where N is the
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// cumulative byte size of all of the parameters to the function in decimal.
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if (CC == CallingConv::X86_VectorCall)
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OS << '@'; // vectorcall functions use a double @ suffix.
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FunctionType *FT = MSFunc->getFunctionType();
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if (hasByteCountSuffix(CC) &&
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// "Pure" variadic functions do not receive @0 suffix.
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(!FT->isVarArg() || FT->getNumParams() == 0 ||
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(FT->getNumParams() == 1 && MSFunc->hasStructRetAttr())))
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addByteCountSuffix(OS, MSFunc, *DL);
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}
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void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
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const GlobalValue *GV,
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bool CannotUsePrivateLabel) const {
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raw_svector_ostream OS(OutName);
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getNameWithPrefix(OS, GV, CannotUsePrivateLabel);
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}
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