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This causes errors like: ld: error: blah.o: requires dynamic R_X86_64_PC32 reloc against '' which may overflow at runtime; recompile with -fPIC blah.cc:function f(): error: undefined reference to '' blah.o:g(): error: undefined reference to '' I have not yet come up with an appropriate reproduction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240394 91177308-0d34-0410-b5e6-96231b3b80d8
590 lines
23 KiB
C++
590 lines
23 KiB
C++
//===- MCContext.h - Machine Code Context -----------------------*- C++ -*-===//
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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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#ifndef LLVM_MC_MCCONTEXT_H
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#define LLVM_MC_MCCONTEXT_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/SectionKind.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/raw_ostream.h"
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#include <map>
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#include <tuple>
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#include <vector> // FIXME: Shouldn't be needed.
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namespace llvm {
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class MCAsmInfo;
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class MCExpr;
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class MCSection;
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class MCSymbol;
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class MCSymbolELF;
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class MCLabel;
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struct MCDwarfFile;
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class MCDwarfLoc;
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class MCObjectFileInfo;
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class MCRegisterInfo;
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class MCLineSection;
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class SMLoc;
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class MCSectionMachO;
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class MCSectionELF;
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class MCSectionCOFF;
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/// Context object for machine code objects. This class owns all of the
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/// sections that it creates.
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///
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class MCContext {
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MCContext(const MCContext &) = delete;
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MCContext &operator=(const MCContext &) = delete;
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public:
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typedef StringMap<MCSymbol *, BumpPtrAllocator &> SymbolTable;
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private:
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/// The SourceMgr for this object, if any.
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const SourceMgr *SrcMgr;
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/// The MCAsmInfo for this target.
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const MCAsmInfo *MAI;
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/// The MCRegisterInfo for this target.
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const MCRegisterInfo *MRI;
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/// The MCObjectFileInfo for this target.
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const MCObjectFileInfo *MOFI;
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/// Allocator object used for creating machine code objects.
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///
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/// We use a bump pointer allocator to avoid the need to track all allocated
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/// objects.
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BumpPtrAllocator Allocator;
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/// Bindings of names to symbols.
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SymbolTable Symbols;
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/// ELF sections can have a corresponding symbol. This maps one to the
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/// other.
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DenseMap<const MCSectionELF *, MCSymbolELF *> SectionSymbols;
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/// A mapping from a local label number and an instance count to a symbol.
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/// For example, in the assembly
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/// 1:
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/// 2:
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/// 1:
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/// We have three labels represented by the pairs (1, 0), (2, 0) and (1, 1)
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DenseMap<std::pair<unsigned, unsigned>, MCSymbol *> LocalSymbols;
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/// Keeps tracks of names that were used both for used declared and
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/// artificial symbols.
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StringMap<bool, BumpPtrAllocator &> UsedNames;
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/// The next ID to dole out to an unnamed assembler temporary symbol with
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/// a given prefix.
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StringMap<unsigned> NextID;
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/// Instances of directional local labels.
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DenseMap<unsigned, MCLabel *> Instances;
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/// NextInstance() creates the next instance of the directional local label
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/// for the LocalLabelVal and adds it to the map if needed.
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unsigned NextInstance(unsigned LocalLabelVal);
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/// GetInstance() gets the current instance of the directional local label
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/// for the LocalLabelVal and adds it to the map if needed.
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unsigned GetInstance(unsigned LocalLabelVal);
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/// The file name of the log file from the environment variable
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/// AS_SECURE_LOG_FILE. Which must be set before the .secure_log_unique
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/// directive is used or it is an error.
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char *SecureLogFile;
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/// The stream that gets written to for the .secure_log_unique directive.
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raw_ostream *SecureLog;
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/// Boolean toggled when .secure_log_unique / .secure_log_reset is seen to
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/// catch errors if .secure_log_unique appears twice without
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/// .secure_log_reset appearing between them.
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bool SecureLogUsed;
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/// The compilation directory to use for DW_AT_comp_dir.
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SmallString<128> CompilationDir;
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/// The main file name if passed in explicitly.
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std::string MainFileName;
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/// The dwarf file and directory tables from the dwarf .file directive.
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/// We now emit a line table for each compile unit. To reduce the prologue
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/// size of each line table, the files and directories used by each compile
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/// unit are separated.
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std::map<unsigned, MCDwarfLineTable> MCDwarfLineTablesCUMap;
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/// The current dwarf line information from the last dwarf .loc directive.
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MCDwarfLoc CurrentDwarfLoc;
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bool DwarfLocSeen;
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/// Generate dwarf debugging info for assembly source files.
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bool GenDwarfForAssembly;
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/// The current dwarf file number when generate dwarf debugging info for
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/// assembly source files.
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unsigned GenDwarfFileNumber;
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/// Sections for generating the .debug_ranges and .debug_aranges sections.
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SetVector<MCSection *> SectionsForRanges;
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/// The information gathered from labels that will have dwarf label
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/// entries when generating dwarf assembly source files.
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std::vector<MCGenDwarfLabelEntry> MCGenDwarfLabelEntries;
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/// The string to embed in the debug information for the compile unit, if
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/// non-empty.
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StringRef DwarfDebugFlags;
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/// The string to embed in as the dwarf AT_producer for the compile unit, if
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/// non-empty.
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StringRef DwarfDebugProducer;
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/// The maximum version of dwarf that we should emit.
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uint16_t DwarfVersion;
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/// Honor temporary labels, this is useful for debugging semantic
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/// differences between temporary and non-temporary labels (primarily on
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/// Darwin).
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bool AllowTemporaryLabels;
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bool UseNamesOnTempLabels = true;
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/// The Compile Unit ID that we are currently processing.
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unsigned DwarfCompileUnitID;
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struct ELFSectionKey {
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std::string SectionName;
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StringRef GroupName;
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unsigned UniqueID;
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ELFSectionKey(StringRef SectionName, StringRef GroupName,
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unsigned UniqueID)
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: SectionName(SectionName), GroupName(GroupName), UniqueID(UniqueID) {
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}
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bool operator<(const ELFSectionKey &Other) const {
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if (SectionName != Other.SectionName)
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return SectionName < Other.SectionName;
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if (GroupName != Other.GroupName)
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return GroupName < Other.GroupName;
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return UniqueID < Other.UniqueID;
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}
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};
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struct COFFSectionKey {
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std::string SectionName;
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StringRef GroupName;
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int SelectionKey;
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COFFSectionKey(StringRef SectionName, StringRef GroupName,
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int SelectionKey)
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: SectionName(SectionName), GroupName(GroupName),
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SelectionKey(SelectionKey) {}
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bool operator<(const COFFSectionKey &Other) const {
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if (SectionName != Other.SectionName)
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return SectionName < Other.SectionName;
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if (GroupName != Other.GroupName)
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return GroupName < Other.GroupName;
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return SelectionKey < Other.SelectionKey;
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}
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};
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StringMap<MCSectionMachO *> MachOUniquingMap;
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std::map<ELFSectionKey, MCSectionELF *> ELFUniquingMap;
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std::map<COFFSectionKey, MCSectionCOFF *> COFFUniquingMap;
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StringMap<bool> ELFRelSecNames;
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/// Do automatic reset in destructor
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bool AutoReset;
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MCSymbol *createSymbolImpl(const StringMapEntry<bool> *Name,
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bool CanBeUnnamed);
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MCSymbol *createSymbol(StringRef Name, bool AlwaysAddSuffix,
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bool IsTemporary);
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MCSymbol *getOrCreateDirectionalLocalSymbol(unsigned LocalLabelVal,
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unsigned Instance);
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public:
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explicit MCContext(const MCAsmInfo *MAI, const MCRegisterInfo *MRI,
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const MCObjectFileInfo *MOFI,
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const SourceMgr *Mgr = nullptr, bool DoAutoReset = true);
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~MCContext();
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const SourceMgr *getSourceManager() const { return SrcMgr; }
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const MCAsmInfo *getAsmInfo() const { return MAI; }
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const MCRegisterInfo *getRegisterInfo() const { return MRI; }
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const MCObjectFileInfo *getObjectFileInfo() const { return MOFI; }
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void setAllowTemporaryLabels(bool Value) { AllowTemporaryLabels = Value; }
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void setUseNamesOnTempLabels(bool Value) { UseNamesOnTempLabels = Value; }
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/// \name Module Lifetime Management
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/// @{
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/// reset - return object to right after construction state to prepare
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/// to process a new module
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void reset();
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/// @}
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/// \name Symbol Management
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/// @{
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/// Create and return a new linker temporary symbol with a unique but
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/// unspecified name.
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MCSymbol *createLinkerPrivateTempSymbol();
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/// Create and return a new assembler temporary symbol with a unique but
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/// unspecified name.
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MCSymbol *createTempSymbol(bool CanBeUnnamed = true);
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MCSymbol *createTempSymbol(const Twine &Name, bool AlwaysAddSuffix,
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bool CanBeUnnamed = true);
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/// Create the definition of a directional local symbol for numbered label
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/// (used for "1:" definitions).
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MCSymbol *createDirectionalLocalSymbol(unsigned LocalLabelVal);
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/// Create and return a directional local symbol for numbered label (used
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/// for "1b" or 1f" references).
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MCSymbol *getDirectionalLocalSymbol(unsigned LocalLabelVal, bool Before);
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/// Lookup the symbol inside with the specified \p Name. If it exists,
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/// return it. If not, create a forward reference and return it.
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///
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/// \param Name - The symbol name, which must be unique across all symbols.
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MCSymbol *getOrCreateSymbol(const Twine &Name);
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MCSymbolELF *getOrCreateSectionSymbol(const MCSectionELF &Section);
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/// Gets a symbol that will be defined to the final stack offset of a local
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/// variable after codegen.
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///
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/// \param Idx - The index of a local variable passed to @llvm.frameescape.
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MCSymbol *getOrCreateFrameAllocSymbol(StringRef FuncName, unsigned Idx);
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MCSymbol *getOrCreateParentFrameOffsetSymbol(StringRef FuncName);
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MCSymbol *getOrCreateLSDASymbol(StringRef FuncName);
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/// Get the symbol for \p Name, or null.
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MCSymbol *lookupSymbol(const Twine &Name) const;
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/// getSymbols - Get a reference for the symbol table for clients that
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/// want to, for example, iterate over all symbols. 'const' because we
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/// still want any modifications to the table itself to use the MCContext
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/// APIs.
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const SymbolTable &getSymbols() const { return Symbols; }
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/// @}
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/// \name Section Management
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/// @{
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/// Return the MCSection for the specified mach-o section. This requires
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/// the operands to be valid.
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MCSectionMachO *getMachOSection(StringRef Segment, StringRef Section,
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unsigned TypeAndAttributes,
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unsigned Reserved2, SectionKind K,
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const char *BeginSymName = nullptr);
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MCSectionMachO *getMachOSection(StringRef Segment, StringRef Section,
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unsigned TypeAndAttributes, SectionKind K,
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const char *BeginSymName = nullptr) {
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return getMachOSection(Segment, Section, TypeAndAttributes, 0, K,
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BeginSymName);
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}
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MCSectionELF *getELFSection(StringRef Section, unsigned Type,
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unsigned Flags) {
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return getELFSection(Section, Type, Flags, nullptr);
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}
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MCSectionELF *getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, const char *BeginSymName) {
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return getELFSection(Section, Type, Flags, 0, "", BeginSymName);
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}
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MCSectionELF *getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, unsigned EntrySize,
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StringRef Group) {
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return getELFSection(Section, Type, Flags, EntrySize, Group, nullptr);
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}
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MCSectionELF *getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, unsigned EntrySize,
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StringRef Group, const char *BeginSymName) {
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return getELFSection(Section, Type, Flags, EntrySize, Group, ~0,
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BeginSymName);
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}
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MCSectionELF *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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return getELFSection(Section, Type, Flags, EntrySize, Group, UniqueID,
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nullptr);
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}
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MCSectionELF *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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MCSectionELF *getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, unsigned EntrySize,
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const MCSymbolELF *Group, unsigned UniqueID,
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const char *BeginSymName,
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const MCSectionELF *Associated);
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MCSectionELF *createELFRelSection(StringRef Name, unsigned Type,
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unsigned Flags, unsigned EntrySize,
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const MCSymbolELF *Group,
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const MCSectionELF *Associated);
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void renameELFSection(MCSectionELF *Section, StringRef Name);
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MCSectionELF *createELFGroupSection(const MCSymbolELF *Group);
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MCSectionCOFF *getCOFFSection(StringRef Section, unsigned Characteristics,
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SectionKind Kind, StringRef COMDATSymName,
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int Selection,
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const char *BeginSymName = nullptr);
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MCSectionCOFF *getCOFFSection(StringRef Section, unsigned Characteristics,
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SectionKind Kind,
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const char *BeginSymName = nullptr);
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MCSectionCOFF *getCOFFSection(StringRef Section);
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/// Gets or creates a section equivalent to Sec that is associated with the
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/// section containing KeySym. For example, to create a debug info section
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/// associated with an inline function, pass the normal debug info section
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/// as Sec and the function symbol as KeySym.
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MCSectionCOFF *getAssociativeCOFFSection(MCSectionCOFF *Sec,
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const MCSymbol *KeySym);
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/// @}
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/// \name Dwarf Management
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/// @{
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/// \brief Get the compilation directory for DW_AT_comp_dir
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/// This can be overridden by clients which want to control the reported
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/// compilation directory and have it be something other than the current
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/// working directory.
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/// Returns an empty string if the current directory cannot be determined.
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StringRef getCompilationDir() const { return CompilationDir; }
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/// \brief Set the compilation directory for DW_AT_comp_dir
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/// Override the default (CWD) compilation directory.
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void setCompilationDir(StringRef S) { CompilationDir = S.str(); }
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/// \brief Get the main file name for use in error messages and debug
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/// info. This can be set to ensure we've got the correct file name
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/// after preprocessing or for -save-temps.
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const std::string &getMainFileName() const { return MainFileName; }
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/// \brief Set the main file name and override the default.
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void setMainFileName(StringRef S) { MainFileName = S; }
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/// Creates an entry in the dwarf file and directory tables.
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unsigned getDwarfFile(StringRef Directory, StringRef FileName,
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unsigned FileNumber, unsigned CUID);
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bool isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID = 0);
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const std::map<unsigned, MCDwarfLineTable> &getMCDwarfLineTables() const {
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return MCDwarfLineTablesCUMap;
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}
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MCDwarfLineTable &getMCDwarfLineTable(unsigned CUID) {
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return MCDwarfLineTablesCUMap[CUID];
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}
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const MCDwarfLineTable &getMCDwarfLineTable(unsigned CUID) const {
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auto I = MCDwarfLineTablesCUMap.find(CUID);
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assert(I != MCDwarfLineTablesCUMap.end());
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return I->second;
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}
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const SmallVectorImpl<MCDwarfFile> &getMCDwarfFiles(unsigned CUID = 0) {
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return getMCDwarfLineTable(CUID).getMCDwarfFiles();
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}
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const SmallVectorImpl<std::string> &getMCDwarfDirs(unsigned CUID = 0) {
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return getMCDwarfLineTable(CUID).getMCDwarfDirs();
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}
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bool hasMCLineSections() const {
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for (const auto &Table : MCDwarfLineTablesCUMap)
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if (!Table.second.getMCDwarfFiles().empty() || Table.second.getLabel())
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return true;
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return false;
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}
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unsigned getDwarfCompileUnitID() { return DwarfCompileUnitID; }
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void setDwarfCompileUnitID(unsigned CUIndex) {
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DwarfCompileUnitID = CUIndex;
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}
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void setMCLineTableCompilationDir(unsigned CUID, StringRef CompilationDir) {
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getMCDwarfLineTable(CUID).setCompilationDir(CompilationDir);
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}
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/// Saves the information from the currently parsed dwarf .loc directive
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/// and sets DwarfLocSeen. When the next instruction is assembled an entry
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/// in the line number table with this information and the address of the
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/// instruction will be created.
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void setCurrentDwarfLoc(unsigned FileNum, unsigned Line, unsigned Column,
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unsigned Flags, unsigned Isa,
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unsigned Discriminator) {
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CurrentDwarfLoc.setFileNum(FileNum);
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CurrentDwarfLoc.setLine(Line);
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CurrentDwarfLoc.setColumn(Column);
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CurrentDwarfLoc.setFlags(Flags);
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CurrentDwarfLoc.setIsa(Isa);
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CurrentDwarfLoc.setDiscriminator(Discriminator);
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DwarfLocSeen = true;
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}
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void clearDwarfLocSeen() { DwarfLocSeen = false; }
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bool getDwarfLocSeen() { return DwarfLocSeen; }
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const MCDwarfLoc &getCurrentDwarfLoc() { return CurrentDwarfLoc; }
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bool getGenDwarfForAssembly() { return GenDwarfForAssembly; }
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void setGenDwarfForAssembly(bool Value) { GenDwarfForAssembly = Value; }
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unsigned getGenDwarfFileNumber() { return GenDwarfFileNumber; }
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void setGenDwarfFileNumber(unsigned FileNumber) {
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GenDwarfFileNumber = FileNumber;
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}
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const SetVector<MCSection *> &getGenDwarfSectionSyms() {
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return SectionsForRanges;
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}
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bool addGenDwarfSection(MCSection *Sec) {
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return SectionsForRanges.insert(Sec);
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}
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void finalizeDwarfSections(MCStreamer &MCOS);
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const std::vector<MCGenDwarfLabelEntry> &getMCGenDwarfLabelEntries() const {
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return MCGenDwarfLabelEntries;
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}
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void addMCGenDwarfLabelEntry(const MCGenDwarfLabelEntry &E) {
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MCGenDwarfLabelEntries.push_back(E);
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}
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void setDwarfDebugFlags(StringRef S) { DwarfDebugFlags = S; }
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StringRef getDwarfDebugFlags() { return DwarfDebugFlags; }
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void setDwarfDebugProducer(StringRef S) { DwarfDebugProducer = S; }
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StringRef getDwarfDebugProducer() { return DwarfDebugProducer; }
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void setDwarfVersion(uint16_t v) { DwarfVersion = v; }
|
|
uint16_t getDwarfVersion() const { return DwarfVersion; }
|
|
|
|
/// @}
|
|
|
|
char *getSecureLogFile() { return SecureLogFile; }
|
|
raw_ostream *getSecureLog() { return SecureLog; }
|
|
bool getSecureLogUsed() { return SecureLogUsed; }
|
|
void setSecureLog(raw_ostream *Value) { SecureLog = Value; }
|
|
void setSecureLogUsed(bool Value) { SecureLogUsed = Value; }
|
|
|
|
void *allocate(unsigned Size, unsigned Align = 8) {
|
|
return Allocator.Allocate(Size, Align);
|
|
}
|
|
void deallocate(void *Ptr) {}
|
|
|
|
// Unrecoverable error has occurred. Display the best diagnostic we can
|
|
// and bail via exit(1). For now, most MC backend errors are unrecoverable.
|
|
// FIXME: We should really do something about that.
|
|
LLVM_ATTRIBUTE_NORETURN void reportFatalError(SMLoc L,
|
|
const Twine &Msg) const;
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
// operator new and delete aren't allowed inside namespaces.
|
|
// The throw specifications are mandated by the standard.
|
|
/// \brief Placement new for using the MCContext's allocator.
|
|
///
|
|
/// This placement form of operator new uses the MCContext's allocator for
|
|
/// obtaining memory. It is a non-throwing new, which means that it returns
|
|
/// null on error. (If that is what the allocator does. The current does, so if
|
|
/// this ever changes, this operator will have to be changed, too.)
|
|
/// Usage looks like this (assuming there's an MCContext 'Context' in scope):
|
|
/// \code
|
|
/// // Default alignment (8)
|
|
/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments);
|
|
/// // Specific alignment
|
|
/// IntegerLiteral *Ex2 = new (Context, 4) IntegerLiteral(arguments);
|
|
/// \endcode
|
|
/// Please note that you cannot use delete on the pointer; it must be
|
|
/// deallocated using an explicit destructor call followed by
|
|
/// \c Context.Deallocate(Ptr).
|
|
///
|
|
/// \param Bytes The number of bytes to allocate. Calculated by the compiler.
|
|
/// \param C The MCContext that provides the allocator.
|
|
/// \param Alignment The alignment of the allocated memory (if the underlying
|
|
/// allocator supports it).
|
|
/// \return The allocated memory. Could be NULL.
|
|
inline void *operator new(size_t Bytes, llvm::MCContext &C,
|
|
size_t Alignment = 8) throw() {
|
|
return C.allocate(Bytes, Alignment);
|
|
}
|
|
/// \brief Placement delete companion to the new above.
|
|
///
|
|
/// This operator is just a companion to the new above. There is no way of
|
|
/// invoking it directly; see the new operator for more details. This operator
|
|
/// is called implicitly by the compiler if a placement new expression using
|
|
/// the MCContext throws in the object constructor.
|
|
inline void operator delete(void *Ptr, llvm::MCContext &C, size_t)
|
|
throw () {
|
|
C.deallocate(Ptr);
|
|
}
|
|
|
|
/// This placement form of operator new[] uses the MCContext's allocator for
|
|
/// obtaining memory. It is a non-throwing new[], which means that it returns
|
|
/// null on error.
|
|
/// Usage looks like this (assuming there's an MCContext 'Context' in scope):
|
|
/// \code
|
|
/// // Default alignment (8)
|
|
/// char *data = new (Context) char[10];
|
|
/// // Specific alignment
|
|
/// char *data = new (Context, 4) char[10];
|
|
/// \endcode
|
|
/// Please note that you cannot use delete on the pointer; it must be
|
|
/// deallocated using an explicit destructor call followed by
|
|
/// \c Context.Deallocate(Ptr).
|
|
///
|
|
/// \param Bytes The number of bytes to allocate. Calculated by the compiler.
|
|
/// \param C The MCContext that provides the allocator.
|
|
/// \param Alignment The alignment of the allocated memory (if the underlying
|
|
/// allocator supports it).
|
|
/// \return The allocated memory. Could be NULL.
|
|
inline void *operator new[](size_t Bytes, llvm::MCContext& C,
|
|
size_t Alignment = 8) throw() {
|
|
return C.allocate(Bytes, Alignment);
|
|
}
|
|
|
|
/// \brief Placement delete[] companion to the new[] above.
|
|
///
|
|
/// This operator is just a companion to the new[] above. There is no way of
|
|
/// invoking it directly; see the new[] operator for more details. This operator
|
|
/// is called implicitly by the compiler if a placement new[] expression using
|
|
/// the MCContext throws in the object constructor.
|
|
inline void operator delete[](void *Ptr, llvm::MCContext &C) throw () {
|
|
C.deallocate(Ptr);
|
|
}
|
|
|
|
#endif
|