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Use a dedicated MachO load command to annotate data-in-code regions. This is the same format the linker produces for final executable images, allowing consistency of representation and use of introspection tools for both object and executable files. Data-in-code regions are annotated via ".data_region"/".end_data_region" directive pairs, with an optional region type. data_region_directive := ".data_region" { region_type } region_type := "jt8" | "jt16" | "jt32" | "jta32" end_data_region_directive := ".end_data_region" The previous handling of ARM-style "$d.*" labels was broken and has been removed. Specifically, it didn't handle ARM vs. Thumb mode when marking the end of the section. rdar://11459456 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157062 91177308-0d34-0410-b5e6-96231b3b80d8
411 lines
16 KiB
C++
411 lines
16 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/MC/SectionKind.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringMap.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 <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 MCLabel;
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class 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 StringRef;
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class Twine;
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class MCSectionMachO;
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class MCSectionELF;
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/// MCContext - Context object for machine code objects. This class owns all
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/// of the sections that it creates.
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///
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class MCContext {
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MCContext(const MCContext&); // DO NOT IMPLEMENT
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MCContext &operator=(const MCContext&); // DO NOT IMPLEMENT
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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 - 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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/// Symbols - Bindings of names to symbols.
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SymbolTable Symbols;
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/// UsedNames - Keeps tracks of names that were used both for used declared
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/// and artificial symbols.
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StringMap<bool, BumpPtrAllocator&> UsedNames;
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/// NextUniqueID - The next ID to dole out to an unnamed assembler temporary
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/// symbol.
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unsigned NextUniqueID;
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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(int64_t 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(int64_t 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 dwarf file and directory tables from the dwarf .file directive.
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std::vector<MCDwarfFile *> MCDwarfFiles;
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std::vector<StringRef> MCDwarfDirs;
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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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/// The default initial text section that we generate dwarf debugging line
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/// info for when generating dwarf assembly source files.
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const MCSection *GenDwarfSection;
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/// Symbols created for the start and end of this section.
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MCSymbol *GenDwarfSectionStartSym, *GenDwarfSectionEndSym;
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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<const 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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/// 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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/// The dwarf line information from the .loc directives for the sections
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/// with assembled machine instructions have after seeing .loc directives.
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DenseMap<const MCSection *, MCLineSection *> MCLineSections;
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/// We need a deterministic iteration order, so we remember the order
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/// the elements were added.
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std::vector<const MCSection *> MCLineSectionOrder;
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void *MachOUniquingMap, *ELFUniquingMap, *COFFUniquingMap;
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MCSymbol *CreateSymbol(StringRef Name);
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public:
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explicit MCContext(const MCAsmInfo &MAI, const MCRegisterInfo &MRI,
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const MCObjectFileInfo *MOFI, const SourceMgr *Mgr = 0);
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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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/// @name Symbol Management
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/// @{
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/// CreateTempSymbol - Create and return a new assembler temporary symbol
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/// with a unique but unspecified name.
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MCSymbol *CreateTempSymbol();
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/// getUniqueSymbolID() - Return a unique identifier for use in constructing
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/// symbol names.
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unsigned getUniqueSymbolID() { return NextUniqueID++; }
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/// CreateDirectionalLocalSymbol - Create the definition of a directional
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/// local symbol for numbered label (used for "1:" definitions).
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MCSymbol *CreateDirectionalLocalSymbol(int64_t LocalLabelVal);
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/// GetDirectionalLocalSymbol - Create and return a directional local
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/// symbol for numbered label (used for "1b" or 1f" references).
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MCSymbol *GetDirectionalLocalSymbol(int64_t LocalLabelVal, int bORf);
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/// GetOrCreateSymbol - Lookup the symbol inside with the specified
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/// @p Name. If it exists, return it. If not, create a forward
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/// 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(StringRef Name);
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MCSymbol *GetOrCreateSymbol(const Twine &Name);
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/// LookupSymbol - Get the symbol for \p Name, or null.
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MCSymbol *LookupSymbol(StringRef 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 {
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return Symbols;
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}
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/// @}
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/// @name Section Management
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/// @{
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/// getMachOSection - Return the MCSection for the specified mach-o section.
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/// This requires the operands to be valid.
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const MCSectionMachO *getMachOSection(StringRef Segment,
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StringRef Section,
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unsigned TypeAndAttributes,
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unsigned Reserved2,
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SectionKind K);
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const MCSectionMachO *getMachOSection(StringRef Segment,
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StringRef Section,
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unsigned TypeAndAttributes,
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SectionKind K) {
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return getMachOSection(Segment, Section, TypeAndAttributes, 0, K);
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}
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const MCSectionELF *getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, SectionKind Kind);
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const MCSectionELF *getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, SectionKind Kind,
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unsigned EntrySize, StringRef Group);
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const MCSectionELF *CreateELFGroupSection();
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const MCSection *getCOFFSection(StringRef Section, unsigned Characteristics,
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int Selection, SectionKind Kind);
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const MCSection *getCOFFSection(StringRef Section, unsigned Characteristics,
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SectionKind Kind) {
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return getCOFFSection (Section, Characteristics, 0, Kind);
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}
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/// @}
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/// @name Dwarf Management
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/// @{
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/// GetDwarfFile - 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);
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bool isValidDwarfFileNumber(unsigned FileNumber);
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bool hasDwarfFiles() const {
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return !MCDwarfFiles.empty();
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}
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const std::vector<MCDwarfFile *> &getMCDwarfFiles() {
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return MCDwarfFiles;
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}
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const std::vector<StringRef> &getMCDwarfDirs() {
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return MCDwarfDirs;
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}
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const DenseMap<const MCSection *, MCLineSection *>
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&getMCLineSections() const {
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return MCLineSections;
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}
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const std::vector<const MCSection *> &getMCLineSectionOrder() const {
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return MCLineSectionOrder;
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}
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void addMCLineSection(const MCSection *Sec, MCLineSection *Line) {
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MCLineSections[Sec] = Line;
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MCLineSectionOrder.push_back(Sec);
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}
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/// setCurrentDwarfLoc - saves the information from the currently parsed
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/// dwarf .loc directive and sets DwarfLocSeen. When the next instruction
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/// is assembled an entry in the line number table with this information and
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/// the address of the 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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unsigned nextGenDwarfFileNumber() { return ++GenDwarfFileNumber; }
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const MCSection *getGenDwarfSection() { return GenDwarfSection; }
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void setGenDwarfSection(const MCSection *Sec) { GenDwarfSection = Sec; }
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MCSymbol *getGenDwarfSectionStartSym() { return GenDwarfSectionStartSym; }
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void setGenDwarfSectionStartSym(MCSymbol *Sym) {
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GenDwarfSectionStartSym = Sym;
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}
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MCSymbol *getGenDwarfSectionEndSym() { return GenDwarfSectionEndSym; }
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void setGenDwarfSectionEndSym(MCSymbol *Sym) {
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GenDwarfSectionEndSym = Sym;
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}
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const std::vector<const MCGenDwarfLabelEntry *>
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&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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/// @}
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char *getSecureLogFile() { return SecureLogFile; }
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raw_ostream *getSecureLog() { return SecureLog; }
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bool getSecureLogUsed() { return SecureLogUsed; }
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void setSecureLog(raw_ostream *Value) {
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SecureLog = Value;
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}
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void setSecureLogUsed(bool Value) {
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SecureLogUsed = Value;
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}
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void *Allocate(unsigned Size, unsigned Align = 8) {
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return Allocator.Allocate(Size, Align);
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}
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void Deallocate(void *Ptr) {
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}
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// Unrecoverable error has occured. Display the best diagnostic we can
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// and bail via exit(1). For now, most MC backend errors are unrecoverable.
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// FIXME: We should really do something about that.
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LLVM_ATTRIBUTE_NORETURN void FatalError(SMLoc L, const Twine &Msg);
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};
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} // end namespace llvm
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// operator new and delete aren't allowed inside namespaces.
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// The throw specifications are mandated by the standard.
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/// @brief Placement new for using the MCContext's allocator.
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///
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/// This placement form of operator new uses the MCContext's allocator for
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/// obtaining memory. It is a non-throwing new, which means that it returns
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/// null on error. (If that is what the allocator does. The current does, so if
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/// this ever changes, this operator will have to be changed, too.)
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/// Usage looks like this (assuming there's an MCContext 'Context' in scope):
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/// @code
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/// // Default alignment (16)
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/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments);
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/// // Specific alignment
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/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments);
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/// @endcode
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/// Please note that you cannot use delete on the pointer; it must be
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/// deallocated using an explicit destructor call followed by
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/// @c Context.Deallocate(Ptr).
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///
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/// @param Bytes The number of bytes to allocate. Calculated by the compiler.
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/// @param C The MCContext that provides the allocator.
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/// @param Alignment The alignment of the allocated memory (if the underlying
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/// allocator supports it).
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/// @return The allocated memory. Could be NULL.
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inline void *operator new(size_t Bytes, llvm::MCContext &C,
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size_t Alignment = 16) throw () {
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return C.Allocate(Bytes, Alignment);
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}
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/// @brief Placement delete companion to the new above.
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///
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/// This operator is just a companion to the new above. There is no way of
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/// invoking it directly; see the new operator for more details. This operator
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/// is called implicitly by the compiler if a placement new expression using
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/// the MCContext throws in the object constructor.
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inline void operator delete(void *Ptr, llvm::MCContext &C, size_t)
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throw () {
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C.Deallocate(Ptr);
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}
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/// This placement form of operator new[] uses the MCContext's allocator for
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/// obtaining memory. It is a non-throwing new[], which means that it returns
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/// null on error.
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/// Usage looks like this (assuming there's an MCContext 'Context' in scope):
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/// @code
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/// // Default alignment (16)
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/// char *data = new (Context) char[10];
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/// // Specific alignment
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/// char *data = new (Context, 8) char[10];
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/// @endcode
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/// Please note that you cannot use delete on the pointer; it must be
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/// deallocated using an explicit destructor call followed by
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/// @c Context.Deallocate(Ptr).
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///
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/// @param Bytes The number of bytes to allocate. Calculated by the compiler.
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/// @param C The MCContext that provides the allocator.
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/// @param Alignment The alignment of the allocated memory (if the underlying
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/// allocator supports it).
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/// @return The allocated memory. Could be NULL.
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inline void *operator new[](size_t Bytes, llvm::MCContext& C,
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size_t Alignment = 16) throw () {
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return C.Allocate(Bytes, Alignment);
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}
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/// @brief Placement delete[] companion to the new[] above.
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///
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/// This operator is just a companion to the new[] above. There is no way of
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/// invoking it directly; see the new[] operator for more details. This operator
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/// is called implicitly by the compiler if a placement new[] expression using
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/// the MCContext throws in the object constructor.
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inline void operator delete[](void *Ptr, llvm::MCContext &C) throw () {
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C.Deallocate(Ptr);
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}
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#endif
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