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https://github.com/c64scene-ar/llvm-6502.git
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Fixes the leaks when running llc. Also found by an asan bot. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238167 91177308-0d34-0410-b5e6-96231b3b80d8
474 lines
16 KiB
C++
474 lines
16 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/MCAssembler.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/MCStreamer.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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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), Allocator(),
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Symbols(Allocator), UsedNames(Allocator),
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CurrentDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0), DwarfLocSeen(false),
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GenDwarfForAssembly(false), GenDwarfFileNumber(0), DwarfVersion(4),
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AllowTemporaryLabels(true), DwarfCompileUnitID(0),
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AutoReset(DoAutoReset) {
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std::error_code EC = llvm::sys::fs::current_path(CompilationDir);
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if (EC)
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CompilationDir.clear();
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SecureLogFile = getenv("AS_SECURE_LOG_FILE");
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SecureLog = nullptr;
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SecureLogUsed = false;
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if (SrcMgr && SrcMgr->getNumBuffers())
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MainFileName =
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SrcMgr->getMemoryBuffer(SrcMgr->getMainFileID())->getBufferIdentifier();
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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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// Call the destructors so the fragments are freed
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for (auto &I : ELFUniquingMap)
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I.second->~MCSectionELF();
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for (auto &I : COFFUniquingMap)
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I.second->~MCSectionCOFF();
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for (auto &I : MachOUniquingMap)
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I.second->~MCSectionMachO();
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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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CompilationDir.clear();
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MainFileName.clear();
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MCDwarfLineTablesCUMap.clear();
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SectionsForRanges.clear();
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MCGenDwarfLabelEntries.clear();
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DwarfDebugFlags = StringRef();
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DwarfCompileUnitID = 0;
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CurrentDwarfLoc = MCDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0);
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MachOUniquingMap.clear();
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ELFUniquingMap.clear();
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COFFUniquingMap.clear();
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NextID.clear();
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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(const Twine &Name) {
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SmallString<128> NameSV;
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StringRef NameRef = Name.toStringRef(NameSV);
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assert(!NameRef.empty() && "Normal symbols cannot be unnamed!");
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MCSymbol *&Sym = Symbols[NameRef];
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if (!Sym)
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Sym = CreateSymbol(NameRef, false);
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return Sym;
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}
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MCSymbol *MCContext::getOrCreateSectionSymbol(const MCSectionELF &Section) {
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MCSymbol *&Sym = SectionSymbols[&Section];
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if (Sym)
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return Sym;
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StringRef Name = Section.getSectionName();
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MCSymbol *&OldSym = Symbols[Name];
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if (OldSym && OldSym->isUndefined()) {
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Sym = OldSym;
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return OldSym;
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}
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auto NameIter = UsedNames.insert(std::make_pair(Name, true)).first;
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Sym = new (*this) MCSymbol(&*NameIter, /*isTemporary*/ false);
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if (!OldSym)
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OldSym = Sym;
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return Sym;
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}
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MCSymbol *MCContext::getOrCreateFrameAllocSymbol(StringRef FuncName,
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unsigned Idx) {
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return getOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + FuncName +
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"$frame_escape_" + Twine(Idx));
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}
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MCSymbol *MCContext::getOrCreateParentFrameOffsetSymbol(StringRef FuncName) {
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return getOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + FuncName +
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"$parent_frame_offset");
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}
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MCSymbol *MCContext::getOrCreateLSDASymbol(StringRef FuncName) {
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return getOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + "__ehtable$" +
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FuncName);
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}
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MCSymbol *MCContext::CreateSymbol(StringRef Name, bool AlwaysAddSuffix) {
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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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if (IsTemporary && AlwaysAddSuffix && !UseNamesOnTempLabels)
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return new (*this) MCSymbol(nullptr, true);
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SmallString<128> NewName = Name;
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bool AddSuffix = AlwaysAddSuffix;
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unsigned &NextUniqueID = NextID[Name];
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for (;;) {
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if (AddSuffix) {
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NewName.resize(Name.size());
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raw_svector_ostream(NewName) << NextUniqueID++;
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}
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auto NameEntry = UsedNames.insert(std::make_pair(NewName, true));
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if (NameEntry.second) {
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// Ok, we found a name. Have the MCSymbol object itself refer to the copy
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// of the string that is embedded in the UsedNames entry.
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MCSymbol *Result = new (*this) MCSymbol(&*NameEntry.first, IsTemporary);
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return Result;
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}
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assert(IsTemporary && "Cannot rename non-temporary symbols");
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AddSuffix = true;
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}
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llvm_unreachable("Infinite loop");
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}
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MCSymbol *MCContext::createTempSymbol(const Twine &Name, bool AlwaysAddSuffix) {
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SmallString<128> NameSV;
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raw_svector_ostream(NameSV) << MAI->getPrivateGlobalPrefix() << Name;
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return CreateSymbol(NameSV, AlwaysAddSuffix);
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}
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MCSymbol *MCContext::createLinkerPrivateTempSymbol() {
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SmallString<128> NameSV;
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raw_svector_ostream(NameSV) << MAI->getLinkerPrivateGlobalPrefix() << "tmp";
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return CreateSymbol(NameSV, true);
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}
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MCSymbol *MCContext::createTempSymbol() {
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return createTempSymbol("tmp", true);
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}
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unsigned MCContext::NextInstance(unsigned 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(unsigned 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::getOrCreateDirectionalLocalSymbol(unsigned LocalLabelVal,
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unsigned Instance) {
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MCSymbol *&Sym = LocalSymbols[std::make_pair(LocalLabelVal, Instance)];
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if (!Sym)
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Sym = createTempSymbol();
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return Sym;
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}
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MCSymbol *MCContext::createDirectionalLocalSymbol(unsigned LocalLabelVal) {
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unsigned Instance = NextInstance(LocalLabelVal);
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return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance);
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}
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MCSymbol *MCContext::getDirectionalLocalSymbol(unsigned LocalLabelVal,
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bool Before) {
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unsigned Instance = GetInstance(LocalLabelVal);
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if (!Before)
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++Instance;
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return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance);
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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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StringRef NameRef = Name.toStringRef(NameSV);
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return Symbols.lookup(NameRef);
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}
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//===----------------------------------------------------------------------===//
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// Section Management
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//===----------------------------------------------------------------------===//
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MCSectionMachO *MCContext::getMachOSection(StringRef Segment, StringRef Section,
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unsigned TypeAndAttributes,
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unsigned Reserved2, SectionKind Kind,
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const char *BeginSymName) {
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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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// 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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MCSectionMachO *&Entry = MachOUniquingMap[Name];
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if (Entry)
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return Entry;
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MCSymbol *Begin = nullptr;
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if (BeginSymName)
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Begin = createTempSymbol(BeginSymName, false);
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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, Begin);
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}
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void MCContext::renameELFSection(MCSectionELF *Section, StringRef Name) {
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StringRef GroupName;
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if (const MCSymbol *Group = Section->getGroup())
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GroupName = Group->getName();
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unsigned UniqueID = Section->getUniqueID();
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ELFUniquingMap.erase(
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ELFSectionKey{Section->getSectionName(), GroupName, UniqueID});
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auto I = ELFUniquingMap.insert(std::make_pair(
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ELFSectionKey{Name, GroupName, UniqueID},
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Section))
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.first;
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StringRef CachedName = I->first.SectionName;
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const_cast<MCSectionELF *>(Section)->setSectionName(CachedName);
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}
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MCSectionELF *MCContext::createELFRelSection(StringRef Name, unsigned Type,
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unsigned Flags, unsigned EntrySize,
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const MCSymbol *Group,
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const MCSectionELF *Associated) {
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StringMap<bool>::iterator I;
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bool Inserted;
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std::tie(I, Inserted) = ELFRelSecNames.insert(std::make_pair(Name, true));
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return new (*this)
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MCSectionELF(I->getKey(), Type, Flags, SectionKind::getReadOnly(),
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EntrySize, Group, true, nullptr, Associated);
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}
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MCSectionELF *MCContext::getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, unsigned EntrySize,
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StringRef Group, unsigned UniqueID,
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const char *BeginSymName) {
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MCSymbol *GroupSym = nullptr;
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if (!Group.empty())
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GroupSym = getOrCreateSymbol(Group);
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return getELFSection(Section, Type, Flags, EntrySize, GroupSym, UniqueID,
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BeginSymName, nullptr);
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}
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MCSectionELF *MCContext::getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, unsigned EntrySize,
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const MCSymbol *GroupSym,
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unsigned UniqueID,
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const char *BeginSymName,
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const MCSectionELF *Associated) {
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StringRef Group = "";
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if (GroupSym)
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Group = GroupSym->getName();
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// Do the lookup, if we have a hit, return it.
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auto IterBool = ELFUniquingMap.insert(
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std::make_pair(ELFSectionKey{Section, Group, UniqueID}, nullptr));
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auto &Entry = *IterBool.first;
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if (!IterBool.second)
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return Entry.second;
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StringRef CachedName = Entry.first.SectionName;
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SectionKind Kind;
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if (Flags & ELF::SHF_EXECINSTR)
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Kind = SectionKind::getText();
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else
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Kind = SectionKind::getReadOnly();
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MCSymbol *Begin = nullptr;
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if (BeginSymName)
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Begin = createTempSymbol(BeginSymName, false);
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MCSectionELF *Result =
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new (*this) MCSectionELF(CachedName, Type, Flags, Kind, EntrySize,
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GroupSym, UniqueID, Begin, Associated);
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Entry.second = Result;
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return Result;
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}
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MCSectionELF *MCContext::createELFGroupSection(const MCSymbol *Group) {
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MCSectionELF *Result = new (*this)
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MCSectionELF(".group", ELF::SHT_GROUP, 0, SectionKind::getReadOnly(), 4,
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Group, ~0, nullptr, nullptr);
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return Result;
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}
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MCSectionCOFF *MCContext::getCOFFSection(StringRef Section,
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unsigned Characteristics,
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SectionKind Kind,
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StringRef COMDATSymName, int Selection,
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const char *BeginSymName) {
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MCSymbol *COMDATSymbol = nullptr;
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if (!COMDATSymName.empty()) {
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COMDATSymbol = getOrCreateSymbol(COMDATSymName);
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COMDATSymName = COMDATSymbol->getName();
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}
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// Do the lookup, if we have a hit, return it.
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COFFSectionKey T{Section, COMDATSymName, Selection};
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auto IterBool = COFFUniquingMap.insert(std::make_pair(T, nullptr));
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auto Iter = IterBool.first;
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if (!IterBool.second)
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return Iter->second;
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MCSymbol *Begin = nullptr;
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if (BeginSymName)
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Begin = createTempSymbol(BeginSymName, false);
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StringRef CachedName = Iter->first.SectionName;
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MCSectionCOFF *Result = new (*this) MCSectionCOFF(
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CachedName, Characteristics, COMDATSymbol, Selection, Kind, Begin);
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Iter->second = Result;
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return Result;
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}
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MCSectionCOFF *MCContext::getCOFFSection(StringRef Section,
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unsigned Characteristics,
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SectionKind Kind,
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const char *BeginSymName) {
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return getCOFFSection(Section, Characteristics, Kind, "", 0, BeginSymName);
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}
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MCSectionCOFF *MCContext::getCOFFSection(StringRef Section) {
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COFFSectionKey T{Section, "", 0};
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auto Iter = COFFUniquingMap.find(T);
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if (Iter == COFFUniquingMap.end())
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return nullptr;
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return Iter->second;
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}
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MCSectionCOFF *MCContext::getAssociativeCOFFSection(MCSectionCOFF *Sec,
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const MCSymbol *KeySym) {
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// Return the normal section if we don't have to be associative.
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if (!KeySym)
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return Sec;
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// Make an associative section with the same name and kind as the normal
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// section.
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unsigned Characteristics =
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Sec->getCharacteristics() | COFF::IMAGE_SCN_LNK_COMDAT;
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return getCOFFSection(Sec->getSectionName(), Characteristics, Sec->getKind(),
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KeySym->getName(),
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COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE);
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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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MCDwarfLineTable &Table = MCDwarfLineTablesCUMap[CUID];
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return Table.getFile(Directory, FileName, 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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const SmallVectorImpl<MCDwarfFile> &MCDwarfFiles = getMCDwarfFiles(CUID);
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if (FileNumber == 0 || FileNumber >= MCDwarfFiles.size())
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return false;
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return !MCDwarfFiles[FileNumber].Name.empty();
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}
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/// Remove empty sections from SectionStartEndSyms, to avoid generating
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/// useless debug info for them.
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void MCContext::finalizeDwarfSections(MCStreamer &MCOS) {
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std::vector<MCSection *> Keep;
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for (MCSection *Sec : SectionsForRanges) {
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if (MCOS.mayHaveInstructions(*Sec))
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Keep.push_back(Sec);
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}
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SectionsForRanges.clear();
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SectionsForRanges.insert(Keep.begin(), Keep.end());
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}
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void MCContext::reportFatalError(SMLoc Loc, const Twine &Msg) const {
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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, false);
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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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