mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-26 07:29:55 +00:00
This is consistent with MSVC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214981 91177308-0d34-0410-b5e6-96231b3b80d8
148 lines
4.9 KiB
C++
148 lines
4.9 KiB
C++
//===-- Mangler.cpp - Self-contained c/asm llvm name mangler --------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Unified name mangler for assembly backends.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/IR/Mangler.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/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
|
|
static void getNameWithPrefixx(raw_ostream &OS, const Twine &GVName,
|
|
Mangler::ManglerPrefixTy PrefixTy,
|
|
const DataLayout &DL, bool UseAt) {
|
|
SmallString<256> TmpData;
|
|
StringRef Name = GVName.toStringRef(TmpData);
|
|
assert(!Name.empty() && "getNameWithPrefix requires non-empty name");
|
|
|
|
// No need to do anything special if the global has the special "do not
|
|
// mangle" flag in the name.
|
|
if (Name[0] == '\1') {
|
|
OS << Name.substr(1);
|
|
return;
|
|
}
|
|
|
|
if (PrefixTy == Mangler::Private)
|
|
OS << DL.getPrivateGlobalPrefix();
|
|
else if (PrefixTy == Mangler::LinkerPrivate)
|
|
OS << DL.getLinkerPrivateGlobalPrefix();
|
|
|
|
if (UseAt) {
|
|
OS << '@';
|
|
} else {
|
|
char Prefix = DL.getGlobalPrefix();
|
|
if (Prefix != '\0')
|
|
OS << Prefix;
|
|
}
|
|
|
|
// If this is a simple string that doesn't need escaping, just append it.
|
|
OS << Name;
|
|
}
|
|
|
|
void Mangler::getNameWithPrefix(raw_ostream &OS, const Twine &GVName,
|
|
ManglerPrefixTy PrefixTy) const {
|
|
return getNameWithPrefixx(OS, GVName, PrefixTy, *DL, false);
|
|
}
|
|
|
|
void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
|
|
const Twine &GVName,
|
|
ManglerPrefixTy PrefixTy) const {
|
|
raw_svector_ostream OS(OutName);
|
|
return getNameWithPrefix(OS, GVName, PrefixTy);
|
|
}
|
|
|
|
/// AddFastCallStdCallSuffix - Microsoft fastcall and stdcall functions require
|
|
/// a suffix on their name indicating the number of words of arguments they
|
|
/// take.
|
|
static void AddFastCallStdCallSuffix(raw_ostream &OS, 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) {
|
|
// Skip arguments in registers to handle typical fastcall lowering.
|
|
if (F->getAttributes().hasAttribute(AI->getArgNo() + 1, Attribute::InReg))
|
|
continue;
|
|
Type *Ty = AI->getType();
|
|
// 'Dereference' type in case of byval or inalloca parameter attribute.
|
|
if (AI->hasByValOrInAllocaAttr())
|
|
Ty = cast<PointerType>(Ty)->getElementType();
|
|
// Size should be aligned to DWORD boundary
|
|
ArgWords += ((TD.getTypeAllocSize(Ty) + 3)/4)*4;
|
|
}
|
|
|
|
OS << '@' << ArgWords;
|
|
}
|
|
|
|
void Mangler::getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV,
|
|
bool CannotUsePrivateLabel) const {
|
|
ManglerPrefixTy PrefixTy = Mangler::Default;
|
|
if (GV->hasPrivateLinkage()) {
|
|
if (CannotUsePrivateLabel)
|
|
PrefixTy = Mangler::LinkerPrivate;
|
|
else
|
|
PrefixTy = Mangler::Private;
|
|
}
|
|
|
|
if (!GV->hasName()) {
|
|
// 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(OS, "__unnamed_" + Twine(ID), PrefixTy);
|
|
return;
|
|
}
|
|
|
|
StringRef Name = GV->getName();
|
|
|
|
bool UseAt = false;
|
|
const Function *MSFunc = nullptr;
|
|
CallingConv::ID CC;
|
|
if (Name[0] != '\1' && DL->hasMicrosoftFastStdCallMangling()) {
|
|
if ((MSFunc = dyn_cast<Function>(GV))) {
|
|
CC = MSFunc->getCallingConv();
|
|
// fastcall functions need to start with @ instead of _.
|
|
if (CC == CallingConv::X86_FastCall)
|
|
UseAt = true;
|
|
}
|
|
}
|
|
|
|
getNameWithPrefixx(OS, Name, PrefixTy, *DL, UseAt);
|
|
|
|
if (!MSFunc)
|
|
return;
|
|
|
|
// If we are supposed to add a microsoft-style suffix for stdcall/fastcall,
|
|
// add it.
|
|
// fastcall and stdcall functions usually need @42 at the end to specify
|
|
// the argument info.
|
|
FunctionType *FT = MSFunc->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 && MSFunc->hasStructRetAttr())))
|
|
AddFastCallStdCallSuffix(OS, MSFunc, *DL);
|
|
}
|
|
|
|
void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
|
|
const GlobalValue *GV,
|
|
bool CannotUsePrivateLabel) const {
|
|
raw_svector_ostream OS(OutName);
|
|
getNameWithPrefix(OS, GV, CannotUsePrivateLabel);
|
|
}
|