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and output the dwarf line number tables. This takes the current loc info after an instruction is assembled and saves the needed info into an object that has vector and for each section. These objects will be used for the final patch to build and emit the encoded dwarf line number tables. Again for now this is only in the Mach-O streamer but at some point will move to a more generic place. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112668 91177308-0d34-0410-b5e6-96231b3b80d8
287 lines
11 KiB
C++
287 lines
11 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/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 MCLineSection;
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class StringRef;
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class Twine;
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class MCSectionMachO;
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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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/// The MCAsmInfo for this target.
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const MCAsmInfo &MAI;
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/// Symbols - Bindings of names to symbols.
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StringMap<MCSymbol*> Symbols;
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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 enviromment 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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/// 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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/// 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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void *MachOUniquingMap, *ELFUniquingMap, *COFFUniquingMap;
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public:
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explicit MCContext(const MCAsmInfo &MAI);
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~MCContext();
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const MCAsmInfo &getAsmInfo() const { return MAI; }
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/// @name Symbol Managment
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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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/// CreateDirectionalLocalSymbol - Create the defintion of a directional
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/// local symbol for numbered label (used for "1:" defintions).
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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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/// @}
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/// @name Section Managment
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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 MCSection *getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, SectionKind Kind,
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bool IsExplicit = false,
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unsigned EntrySize = 0);
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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 Managment
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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 FileName, unsigned FileNumber);
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bool ValidateDwarfFileNumber(unsigned FileNumber);
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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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DenseMap<const MCSection *, MCLineSection *> &getMCLineSections() {
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return MCLineSections;
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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 /// 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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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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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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/// @}
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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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};
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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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