forked from OSchip/llvm-project
92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
//===-- llvm/CodeGen/X86COFFMachineModuleInfo.cpp -------------------------===//
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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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// This is an MMI implementation for X86 COFF (windows) targets.
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//
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//===----------------------------------------------------------------------===//
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#include "X86COFFMachineModuleInfo.h"
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#include "X86MachineFunctionInfo.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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X86COFFMachineModuleInfo::X86COFFMachineModuleInfo(const MachineModuleInfo &) {
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}
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X86COFFMachineModuleInfo::~X86COFFMachineModuleInfo() {
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}
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void X86COFFMachineModuleInfo::addExternalFunction(const StringRef& Name) {
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CygMingStubs.insert(Name);
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}
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/// DecorateCygMingName - Apply various name decorations if the function uses
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/// stdcall or fastcall calling convention.
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void X86COFFMachineModuleInfo::DecorateCygMingName(SmallVectorImpl<char> &Name,
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const GlobalValue *GV,
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const TargetData &TD) {
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const Function *F = dyn_cast<Function>(GV);
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if (!F) return;
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// We don't want to decorate non-stdcall or non-fastcall functions right now
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CallingConv::ID CC = F->getCallingConv();
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if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
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return;
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unsigned ArgWords = 0;
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DenseMap<const Function*, unsigned>::const_iterator item = FnArgWords.find(F);
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if (item == FnArgWords.end()) {
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// Calculate arguments sizes
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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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const Type* Ty = AI->getType();
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// 'Dereference' type in case of byval parameter attribute
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if (AI->hasByValAttr())
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Ty = cast<PointerType>(Ty)->getElementType();
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// Size should be aligned to DWORD boundary
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ArgWords += ((TD.getTypeAllocSize(Ty) + 3)/4)*4;
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}
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FnArgWords[F] = ArgWords;
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} else
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ArgWords = item->second;
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const FunctionType *FT = F->getFunctionType();
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// "Pure" variadic functions do not receive @0 suffix.
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if (!FT->isVarArg() || FT->getNumParams() == 0 ||
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(FT->getNumParams() == 1 && F->hasStructRetAttr()))
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raw_svector_ostream(Name) << '@' << ArgWords;
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if (CC == CallingConv::X86_FastCall) {
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if (Name[0] == '_')
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Name[0] = '@';
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else
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Name.insert(Name.begin(), '@');
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}
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}
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/// DecorateCygMingName - Query FunctionInfoMap and use this information for
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/// various name decorations for Cygwin and MingW.
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void X86COFFMachineModuleInfo::DecorateCygMingName(MCSymbol *&Name,
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MCContext &Ctx,
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const GlobalValue *GV,
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const TargetData &TD) {
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SmallString<128> NameStr(Name->getName().begin(), Name->getName().end());
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DecorateCygMingName(NameStr, GV, TD);
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Name = Ctx.GetOrCreateSymbol(NameStr.str());
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}
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