mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-21 18:29:45 +00:00
72935dd909
This is the first step to fix pr17918. It extends the .section directive a bit, inspired by what the ELF one looks like. The problem with using linkonce is that given .section foo .linkonce.... .section foo .linkonce we would already have switched sections when getting to .linkonce. The cleanest solution seems to be to add the comdat information in the .section itself. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195148 91177308-0d34-0410-b5e6-96231b3b80d8
427 lines
14 KiB
C++
427 lines
14 KiB
C++
//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
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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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#include "llvm/MC/MCContext.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/MC/MCAsmInfo.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/MCLabel.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/SourceMgr.h"
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#include <map>
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using namespace llvm;
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typedef std::pair<std::string, std::string> SectionGroupPair;
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typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
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typedef std::map<SectionGroupPair, const MCSectionELF *> ELFUniqueMapTy;
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typedef std::map<SectionGroupPair, const MCSectionCOFF *> COFFUniqueMapTy;
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MCContext::MCContext(const MCAsmInfo *mai, const MCRegisterInfo *mri,
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const MCObjectFileInfo *mofi, const SourceMgr *mgr,
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bool DoAutoReset) :
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SrcMgr(mgr), MAI(mai), MRI(mri), MOFI(mofi),
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Allocator(), Symbols(Allocator), UsedNames(Allocator),
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NextUniqueID(0),
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CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0),
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DwarfLocSeen(false), GenDwarfForAssembly(false), GenDwarfFileNumber(0),
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AllowTemporaryLabels(true), DwarfCompileUnitID(0), AutoReset(DoAutoReset) {
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error_code EC = llvm::sys::fs::current_path(CompilationDir);
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assert(!EC && "Could not determine the current directory");
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(void)EC;
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MachOUniquingMap = 0;
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ELFUniquingMap = 0;
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COFFUniquingMap = 0;
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SecureLogFile = getenv("AS_SECURE_LOG_FILE");
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SecureLog = 0;
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SecureLogUsed = false;
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if (SrcMgr && SrcMgr->getNumBuffers() > 0)
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MainFileName = SrcMgr->getMemoryBuffer(0)->getBufferIdentifier();
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else
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MainFileName = "";
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}
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MCContext::~MCContext() {
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if (AutoReset)
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reset();
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// NOTE: The symbols are all allocated out of a bump pointer allocator,
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// we don't need to free them here.
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// If the stream for the .secure_log_unique directive was created free it.
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delete (raw_ostream*)SecureLog;
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}
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//===----------------------------------------------------------------------===//
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// Module Lifetime Management
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//===----------------------------------------------------------------------===//
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void MCContext::reset() {
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UsedNames.clear();
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Symbols.clear();
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Allocator.Reset();
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Instances.clear();
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MCDwarfFilesCUMap.clear();
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MCDwarfDirsCUMap.clear();
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MCGenDwarfLabelEntries.clear();
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DwarfDebugFlags = StringRef();
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MCLineSections.clear();
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MCLineSectionOrder.clear();
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DwarfCompileUnitID = 0;
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MCLineTableSymbols.clear();
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CurrentDwarfLoc = MCDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0);
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// If we have the MachO uniquing map, free it.
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delete (MachOUniqueMapTy*)MachOUniquingMap;
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delete (ELFUniqueMapTy*)ELFUniquingMap;
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delete (COFFUniqueMapTy*)COFFUniquingMap;
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MachOUniquingMap = 0;
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ELFUniquingMap = 0;
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COFFUniquingMap = 0;
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NextUniqueID = 0;
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AllowTemporaryLabels = true;
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DwarfLocSeen = false;
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GenDwarfForAssembly = false;
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GenDwarfFileNumber = 0;
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}
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//===----------------------------------------------------------------------===//
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// Symbol Manipulation
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//===----------------------------------------------------------------------===//
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MCSymbol *MCContext::GetOrCreateSymbol(StringRef Name) {
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assert(!Name.empty() && "Normal symbols cannot be unnamed!");
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// Do the lookup and get the entire StringMapEntry. We want access to the
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// key if we are creating the entry.
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StringMapEntry<MCSymbol*> &Entry = Symbols.GetOrCreateValue(Name);
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MCSymbol *Sym = Entry.getValue();
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if (Sym)
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return Sym;
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Sym = CreateSymbol(Name);
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Entry.setValue(Sym);
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return Sym;
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}
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MCSymbol *MCContext::CreateSymbol(StringRef Name) {
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// Determine whether this is an assembler temporary or normal label, if used.
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bool isTemporary = false;
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if (AllowTemporaryLabels)
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isTemporary = Name.startswith(MAI->getPrivateGlobalPrefix());
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StringMapEntry<bool> *NameEntry = &UsedNames.GetOrCreateValue(Name);
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if (NameEntry->getValue()) {
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assert(isTemporary && "Cannot rename non temporary symbols");
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SmallString<128> NewName = Name;
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do {
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NewName.resize(Name.size());
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raw_svector_ostream(NewName) << NextUniqueID++;
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NameEntry = &UsedNames.GetOrCreateValue(NewName);
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} while (NameEntry->getValue());
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}
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NameEntry->setValue(true);
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// Ok, the entry doesn't already exist. Have the MCSymbol object itself refer
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// to the copy of the string that is embedded in the UsedNames entry.
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MCSymbol *Result = new (*this) MCSymbol(NameEntry->getKey(), isTemporary);
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return Result;
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}
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MCSymbol *MCContext::GetOrCreateSymbol(const Twine &Name) {
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SmallString<128> NameSV;
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Name.toVector(NameSV);
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return GetOrCreateSymbol(NameSV.str());
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}
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MCSymbol *MCContext::CreateTempSymbol() {
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SmallString<128> NameSV;
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raw_svector_ostream(NameSV)
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<< MAI->getPrivateGlobalPrefix() << "tmp" << NextUniqueID++;
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return CreateSymbol(NameSV);
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}
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unsigned MCContext::NextInstance(int64_t LocalLabelVal) {
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MCLabel *&Label = Instances[LocalLabelVal];
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if (!Label)
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Label = new (*this) MCLabel(0);
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return Label->incInstance();
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}
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unsigned MCContext::GetInstance(int64_t LocalLabelVal) {
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MCLabel *&Label = Instances[LocalLabelVal];
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if (!Label)
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Label = new (*this) MCLabel(0);
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return Label->getInstance();
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}
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MCSymbol *MCContext::CreateDirectionalLocalSymbol(int64_t LocalLabelVal) {
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return GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
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Twine(LocalLabelVal) +
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"\2" +
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Twine(NextInstance(LocalLabelVal)));
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}
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MCSymbol *MCContext::GetDirectionalLocalSymbol(int64_t LocalLabelVal,
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int bORf) {
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return GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
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Twine(LocalLabelVal) +
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"\2" +
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Twine(GetInstance(LocalLabelVal) + bORf));
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}
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MCSymbol *MCContext::LookupSymbol(StringRef Name) const {
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return Symbols.lookup(Name);
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}
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MCSymbol *MCContext::LookupSymbol(const Twine &Name) const {
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SmallString<128> NameSV;
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Name.toVector(NameSV);
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return LookupSymbol(NameSV.str());
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}
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//===----------------------------------------------------------------------===//
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// Section Management
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//===----------------------------------------------------------------------===//
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const MCSectionMachO *MCContext::
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getMachOSection(StringRef Segment, StringRef Section,
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unsigned TypeAndAttributes,
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unsigned Reserved2, SectionKind Kind) {
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// We unique sections by their segment/section pair. The returned section
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// may not have the same flags as the requested section, if so this should be
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// diagnosed by the client as an error.
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// Create the map if it doesn't already exist.
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if (MachOUniquingMap == 0)
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MachOUniquingMap = new MachOUniqueMapTy();
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MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)MachOUniquingMap;
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// Form the name to look up.
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SmallString<64> Name;
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Name += Segment;
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Name.push_back(',');
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Name += Section;
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// Do the lookup, if we have a hit, return it.
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const MCSectionMachO *&Entry = Map[Name.str()];
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if (Entry) return Entry;
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// Otherwise, return a new section.
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return Entry = new (*this) MCSectionMachO(Segment, Section, TypeAndAttributes,
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Reserved2, Kind);
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}
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const MCSectionELF *MCContext::
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getELFSection(StringRef Section, unsigned Type, unsigned Flags,
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SectionKind Kind) {
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return getELFSection(Section, Type, Flags, Kind, 0, "");
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}
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const MCSectionELF *MCContext::
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getELFSection(StringRef Section, unsigned Type, unsigned Flags,
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SectionKind Kind, unsigned EntrySize, StringRef Group) {
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if (ELFUniquingMap == 0)
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ELFUniquingMap = new ELFUniqueMapTy();
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ELFUniqueMapTy &Map = *(ELFUniqueMapTy*)ELFUniquingMap;
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// Do the lookup, if we have a hit, return it.
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std::pair<ELFUniqueMapTy::iterator, bool> Entry = Map.insert(
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std::make_pair(SectionGroupPair(Section, Group), (MCSectionELF *)0));
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if (!Entry.second) return Entry.first->second;
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// Possibly refine the entry size first.
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if (!EntrySize) {
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EntrySize = MCSectionELF::DetermineEntrySize(Kind);
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}
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MCSymbol *GroupSym = NULL;
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if (!Group.empty())
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GroupSym = GetOrCreateSymbol(Group);
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MCSectionELF *Result = new (*this) MCSectionELF(
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Entry.first->first.first, Type, Flags, Kind, EntrySize, GroupSym);
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Entry.first->second = Result;
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return Result;
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}
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const MCSectionELF *MCContext::CreateELFGroupSection() {
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MCSectionELF *Result =
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new (*this) MCSectionELF(".group", ELF::SHT_GROUP, 0,
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SectionKind::getReadOnly(), 4, NULL);
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return Result;
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}
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const MCSectionCOFF *
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MCContext::getCOFFSection(StringRef Section, unsigned Characteristics,
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SectionKind Kind, StringRef COMDATSymName,
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int Selection, const MCSectionCOFF *Assoc) {
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if (COFFUniquingMap == 0)
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COFFUniquingMap = new COFFUniqueMapTy();
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COFFUniqueMapTy &Map = *(COFFUniqueMapTy*)COFFUniquingMap;
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// Do the lookup, if we have a hit, return it.
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SectionGroupPair P(Section, COMDATSymName);
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std::pair<COFFUniqueMapTy::iterator, bool> Entry =
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Map.insert(std::make_pair(P, (MCSectionCOFF *)0));
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COFFUniqueMapTy::iterator Iter = Entry.first;
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if (!Entry.second)
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return Iter->second;
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const MCSymbol *COMDATSymbol = NULL;
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if (!COMDATSymName.empty())
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COMDATSymbol = GetOrCreateSymbol(COMDATSymName);
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MCSectionCOFF *Result =
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new (*this) MCSectionCOFF(Iter->first.first, Characteristics,
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COMDATSymbol, Selection, Assoc, Kind);
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Iter->second = Result;
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return Result;
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}
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const MCSectionCOFF *
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MCContext::getCOFFSection(StringRef Section, unsigned Characteristics,
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SectionKind Kind) {
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return getCOFFSection(Section, Characteristics, Kind, "", 0);
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}
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const MCSectionCOFF *MCContext::getCOFFSection(StringRef Section) {
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if (COFFUniquingMap == 0)
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COFFUniquingMap = new COFFUniqueMapTy();
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COFFUniqueMapTy &Map = *(COFFUniqueMapTy*)COFFUniquingMap;
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SectionGroupPair P(Section, "");
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COFFUniqueMapTy::iterator Iter = Map.find(P);
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if (Iter == Map.end())
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return 0;
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return Iter->second;
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}
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//===----------------------------------------------------------------------===//
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// Dwarf Management
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//===----------------------------------------------------------------------===//
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/// GetDwarfFile - takes a file name an number to place in the dwarf file and
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/// directory tables. If the file number has already been allocated it is an
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/// error and zero is returned and the client reports the error, else the
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/// allocated file number is returned. The file numbers may be in any order.
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unsigned MCContext::GetDwarfFile(StringRef Directory, StringRef FileName,
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unsigned FileNumber, unsigned CUID) {
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// TODO: a FileNumber of zero says to use the next available file number.
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// Note: in GenericAsmParser::ParseDirectiveFile() FileNumber was checked
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// to not be less than one. This needs to be change to be not less than zero.
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SmallVectorImpl<MCDwarfFile *>& MCDwarfFiles = MCDwarfFilesCUMap[CUID];
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SmallVectorImpl<StringRef>& MCDwarfDirs = MCDwarfDirsCUMap[CUID];
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// Make space for this FileNumber in the MCDwarfFiles vector if needed.
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if (FileNumber >= MCDwarfFiles.size()) {
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MCDwarfFiles.resize(FileNumber + 1);
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} else {
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MCDwarfFile *&ExistingFile = MCDwarfFiles[FileNumber];
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if (ExistingFile)
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// It is an error to use see the same number more than once.
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return 0;
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}
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// Get the new MCDwarfFile slot for this FileNumber.
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MCDwarfFile *&File = MCDwarfFiles[FileNumber];
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if (Directory.empty()) {
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// Separate the directory part from the basename of the FileName.
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StringRef tFileName = sys::path::filename(FileName);
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if (!tFileName.empty()) {
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Directory = sys::path::parent_path(FileName);
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if (!Directory.empty())
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FileName = tFileName;
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}
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}
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// Find or make a entry in the MCDwarfDirs vector for this Directory.
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// Capture directory name.
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unsigned DirIndex;
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if (Directory.empty()) {
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// For FileNames with no directories a DirIndex of 0 is used.
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DirIndex = 0;
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} else {
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DirIndex = 0;
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for (unsigned End = MCDwarfDirs.size(); DirIndex < End; DirIndex++) {
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if (Directory == MCDwarfDirs[DirIndex])
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break;
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}
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if (DirIndex >= MCDwarfDirs.size()) {
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char *Buf = static_cast<char *>(Allocate(Directory.size()));
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memcpy(Buf, Directory.data(), Directory.size());
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MCDwarfDirs.push_back(StringRef(Buf, Directory.size()));
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}
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// The DirIndex is one based, as DirIndex of 0 is used for FileNames with
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// no directories. MCDwarfDirs[] is unlike MCDwarfFiles[] in that the
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// directory names are stored at MCDwarfDirs[DirIndex-1] where FileNames
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// are stored at MCDwarfFiles[FileNumber].Name .
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DirIndex++;
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}
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// Now make the MCDwarfFile entry and place it in the slot in the MCDwarfFiles
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// vector.
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char *Buf = static_cast<char *>(Allocate(FileName.size()));
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memcpy(Buf, FileName.data(), FileName.size());
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File = new (*this) MCDwarfFile(StringRef(Buf, FileName.size()), DirIndex);
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// return the allocated FileNumber.
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return FileNumber;
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}
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/// isValidDwarfFileNumber - takes a dwarf file number and returns true if it
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/// currently is assigned and false otherwise.
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bool MCContext::isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID) {
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SmallVectorImpl<MCDwarfFile *>& MCDwarfFiles = MCDwarfFilesCUMap[CUID];
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if(FileNumber == 0 || FileNumber >= MCDwarfFiles.size())
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return false;
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return MCDwarfFiles[FileNumber] != 0;
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}
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void MCContext::FatalError(SMLoc Loc, const Twine &Msg) {
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// If we have a source manager and a location, use it. Otherwise just
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// use the generic report_fatal_error().
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if (!SrcMgr || Loc == SMLoc())
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report_fatal_error(Msg);
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// Use the source manager to print the message.
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SrcMgr->PrintMessage(Loc, SourceMgr::DK_Error, Msg);
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// If we reached here, we are failing ungracefully. Run the interrupt handlers
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// to make sure any special cleanups get done, in particular that we remove
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// files registered with RemoveFileOnSignal.
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sys::RunInterruptHandlers();
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exit(1);
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}
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