MCContext.h revision e61a1ac595deddd291912930efac3616f7c61d08
1d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org//===- MCContext.h - Machine Code Context -----------------------*- C++ -*-===// 2d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// 3d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// The LLVM Compiler Infrastructure 4d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// 5d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// This file is distributed under the University of Illinois Open Source 6d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// License. See LICENSE.TXT for details. 7d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org// 86a0c735027d75e13d03f286ffde9a696ee52d920agl@chromium.org//===----------------------------------------------------------------------===// 998281afef95be7fee74edc8df7351f8b5e9969d1agl@chromium.org 10d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#ifndef LLVM_MC_MCCONTEXT_H 11d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#define LLVM_MC_MCCONTEXT_H 12d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 13d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#include "llvm/MC/SectionKind.h" 14d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#include "llvm/MC/MCDwarf.h" 15d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#include "llvm/ADT/DenseMap.h" 16d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#include "llvm/ADT/StringMap.h" 17d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org#include "llvm/Support/Allocator.h" 1898281afef95be7fee74edc8df7351f8b5e9969d1agl@chromium.org#include "llvm/Support/raw_ostream.h" 1998281afef95be7fee74edc8df7351f8b5e9969d1agl@chromium.org#include <vector> // FIXME: Shouldn't be needed. 2098281afef95be7fee74edc8df7351f8b5e9969d1agl@chromium.org 2198281afef95be7fee74edc8df7351f8b5e9969d1agl@chromium.orgnamespace llvm { 22d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class MCAsmInfo; 23d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class MCExpr; 24d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class MCSection; 25d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class MCSymbol; 26d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class MCLabel; 27d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class MCDwarfFile; 28d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class MCDwarfLoc; 2918908189deb0ea39155f5558173862807e2936e1agl@chromium.org class MCLineSection; 30d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class StringRef; 31d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class Twine; 32d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class MCSectionMachO; 33d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 34d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// MCContext - Context object for machine code objects. This class owns all 35d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// of the sections that it creates. 36d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// 37d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org class MCContext { 38d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org MCContext(const MCContext&); // DO NOT IMPLEMENT 39d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org MCContext &operator=(const MCContext&); // DO NOT IMPLEMENT 40d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 41d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// The MCAsmInfo for this target. 42d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const MCAsmInfo &MAI; 43d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 44d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// Symbols - Bindings of names to symbols. 45d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org StringMap<MCSymbol*> Symbols; 46d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 47d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// NextUniqueID - The next ID to dole out to an unnamed assembler temporary 48d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// symbol. 49d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned NextUniqueID; 50d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 51d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// Instances of directional local labels. 52d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org DenseMap<unsigned, MCLabel *> Instances; 53d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// NextInstance() creates the next instance of the directional local label 54d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// for the LocalLabelVal and adds it to the map if needed. 55d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned NextInstance(int64_t LocalLabelVal); 56d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// GetInstance() gets the current instance of the directional local label 57d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// for the LocalLabelVal and adds it to the map if needed. 58d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned GetInstance(int64_t LocalLabelVal); 59d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 60d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// The file name of the log file from the enviromment variable 61d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// AS_SECURE_LOG_FILE. Which must be set before the .secure_log_unique 62d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// directive is used or it is an error. 63d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org char *SecureLogFile; 6419a629d15a4f78d5d37cee6aabdb71f7d9400ca6yusukes@chromium.org /// The stream that gets written to for the .secure_log_unique directive. 6519a629d15a4f78d5d37cee6aabdb71f7d9400ca6yusukes@chromium.org raw_ostream *SecureLog; 6619a629d15a4f78d5d37cee6aabdb71f7d9400ca6yusukes@chromium.org /// Boolean toggled when .secure_log_unique / .secure_log_reset is seen to 67d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// catch errors if .secure_log_unique appears twice without 68d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// .secure_log_reset appearing between them. 69d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org bool SecureLogUsed; 70d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 71d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// The dwarf file and directory tables from the dwarf .file directive. 72d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org std::vector<MCDwarfFile *> MCDwarfFiles; 73d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org std::vector<StringRef> MCDwarfDirs; 74d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 75d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// The current dwarf line information from the last dwarf .loc directive. 76d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org MCDwarfLoc CurrentDwarfLoc; 77d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org bool DwarfLocSeen; 78d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 79d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// The dwarf line information from the .loc directives for the sections 80d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// with assembled machine instructions have after seeing .loc directives. 81d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org DenseMap<const MCSection *, MCLineSection *> MCLineSections; 82d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 83d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// Allocator - Allocator object used for creating machine code objects. 84d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// 85d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// We use a bump pointer allocator to avoid the need to track all allocated 86d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// objects. 87d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org BumpPtrAllocator Allocator; 88d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 89d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org void *MachOUniquingMap, *ELFUniquingMap, *COFFUniquingMap; 90d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org public: 91d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org explicit MCContext(const MCAsmInfo &MAI); 92d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org ~MCContext(); 93d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 94d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const MCAsmInfo &getAsmInfo() const { return MAI; } 95d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 96d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// @name Symbol Managment 97d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// @{ 98d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 99d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// CreateTempSymbol - Create and return a new assembler temporary symbol 100d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// with a unique but unspecified name. 101d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org MCSymbol *CreateTempSymbol(); 102d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 103d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// CreateDirectionalLocalSymbol - Create the defintion of a directional 104d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// local symbol for numbered label (used for "1:" defintions). 10593aedf7d27cb93f93077f9f7f758e830a392bdfcbashi@google.com MCSymbol *CreateDirectionalLocalSymbol(int64_t LocalLabelVal); 10693aedf7d27cb93f93077f9f7f758e830a392bdfcbashi@google.com 10793aedf7d27cb93f93077f9f7f758e830a392bdfcbashi@google.com /// GetDirectionalLocalSymbol - Create and return a directional local 10893aedf7d27cb93f93077f9f7f758e830a392bdfcbashi@google.com /// symbol for numbered label (used for "1b" or 1f" references). 109d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org MCSymbol *GetDirectionalLocalSymbol(int64_t LocalLabelVal, int bORf); 110d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 111d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// GetOrCreateSymbol - Lookup the symbol inside with the specified 112d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// @p Name. If it exists, return it. If not, create a forward 113d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// reference and return it. 114d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// 115d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// @param Name - The symbol name, which must be unique across all symbols. 116d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org MCSymbol *GetOrCreateSymbol(StringRef Name); 117d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org MCSymbol *GetOrCreateSymbol(const Twine &Name); 118d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 11993aedf7d27cb93f93077f9f7f758e830a392bdfcbashi@google.com /// LookupSymbol - Get the symbol for \p Name, or null. 12093aedf7d27cb93f93077f9f7f758e830a392bdfcbashi@google.com MCSymbol *LookupSymbol(StringRef Name) const; 12193aedf7d27cb93f93077f9f7f758e830a392bdfcbashi@google.com 12293aedf7d27cb93f93077f9f7f758e830a392bdfcbashi@google.com /// @} 12393aedf7d27cb93f93077f9f7f758e830a392bdfcbashi@google.com 124d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// @name Section Managment 125d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// @{ 126d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 127d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// getMachOSection - Return the MCSection for the specified mach-o section. 128d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// This requires the operands to be valid. 129d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const MCSectionMachO *getMachOSection(StringRef Segment, 130d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org StringRef Section, 131d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned TypeAndAttributes, 132d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned Reserved2, 133d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org SectionKind K); 134d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const MCSectionMachO *getMachOSection(StringRef Segment, 135d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org StringRef Section, 136d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned TypeAndAttributes, 137d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org SectionKind K) { 138d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return getMachOSection(Segment, Section, TypeAndAttributes, 0, K); 139d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 140d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 141d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const MCSection *getELFSection(StringRef Section, unsigned Type, 142d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned Flags, SectionKind Kind, 143d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned EntrySize = 0); 144d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 145d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const MCSection *getCOFFSection(StringRef Section, unsigned Characteristics, 146d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org int Selection, SectionKind Kind); 147d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 148d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const MCSection *getCOFFSection(StringRef Section, unsigned Characteristics, 149d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org SectionKind Kind) { 150d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return getCOFFSection (Section, Characteristics, 0, Kind); 151d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 152d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 153d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 154d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// @} 155d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 156d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// @name Dwarf Managment 157d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// @{ 158d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 159d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// GetDwarfFile - creates an entry in the dwarf file and directory tables. 160d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned GetDwarfFile(StringRef FileName, unsigned FileNumber); 161d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 162d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org bool isValidDwarfFileNumber(unsigned FileNumber); 163d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 164d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org bool hasDwarfFiles(void) { 165d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return MCDwarfFiles.size() != 0; 166d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 167d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 168d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const std::vector<MCDwarfFile *> &getMCDwarfFiles() { 169d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return MCDwarfFiles; 170d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 171d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org const std::vector<StringRef> &getMCDwarfDirs() { 172d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return MCDwarfDirs; 173d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 174d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org DenseMap<const MCSection *, MCLineSection *> &getMCLineSections() { 175d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org return MCLineSections; 176d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 177d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 178d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// setCurrentDwarfLoc - saves the information from the currently parsed 179d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// dwarf .loc directive and sets DwarfLocSeen. When the next instruction 180d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// is assembled an entry in the line number table with this information and 181d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org /// the address of the instruction will be created. 182d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org void setCurrentDwarfLoc(unsigned FileNum, unsigned Line, unsigned Column, 183d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org unsigned Flags, unsigned Isa) { 184d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org CurrentDwarfLoc.setFileNum(FileNum); 185d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org CurrentDwarfLoc.setLine(Line); 186d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org CurrentDwarfLoc.setColumn(Column); 187d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org CurrentDwarfLoc.setFlags(Flags); 188d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org CurrentDwarfLoc.setIsa(Isa); 189d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org DwarfLocSeen = true; 190d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 191d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org void ClearDwarfLocSeen() { DwarfLocSeen = false; } 192d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org 193d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org bool getDwarfLocSeen() { return DwarfLocSeen; } 19474343ba7bd420519a9a4f7b22977d7771286f6f8ksakamoto@chromium.org const MCDwarfLoc &getCurrentDwarfLoc() { return CurrentDwarfLoc; } 1956462c58fa123bb89baf1ec4b7538d8f2c682dc8bbashi@chromium.org 19674343ba7bd420519a9a4f7b22977d7771286f6f8ksakamoto@chromium.org /// @} 19774343ba7bd420519a9a4f7b22977d7771286f6f8ksakamoto@chromium.org 1986462c58fa123bb89baf1ec4b7538d8f2c682dc8bbashi@chromium.org char *getSecureLogFile() { return SecureLogFile; } 1996462c58fa123bb89baf1ec4b7538d8f2c682dc8bbashi@chromium.org raw_ostream *getSecureLog() { return SecureLog; } 2006462c58fa123bb89baf1ec4b7538d8f2c682dc8bbashi@chromium.org bool getSecureLogUsed() { return SecureLogUsed; } 201d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org void setSecureLog(raw_ostream *Value) { 202d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org SecureLog = Value; 203d257d186ae2a08042a412824678f98241a1a4f3cyusukes@chromium.org } 204 void setSecureLogUsed(bool Value) { 205 SecureLogUsed = Value; 206 } 207 208 void *Allocate(unsigned Size, unsigned Align = 8) { 209 return Allocator.Allocate(Size, Align); 210 } 211 void Deallocate(void *Ptr) { 212 } 213 }; 214 215} // end namespace llvm 216 217// operator new and delete aren't allowed inside namespaces. 218// The throw specifications are mandated by the standard. 219/// @brief Placement new for using the MCContext's allocator. 220/// 221/// This placement form of operator new uses the MCContext's allocator for 222/// obtaining memory. It is a non-throwing new, which means that it returns 223/// null on error. (If that is what the allocator does. The current does, so if 224/// this ever changes, this operator will have to be changed, too.) 225/// Usage looks like this (assuming there's an MCContext 'Context' in scope): 226/// @code 227/// // Default alignment (16) 228/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments); 229/// // Specific alignment 230/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments); 231/// @endcode 232/// Please note that you cannot use delete on the pointer; it must be 233/// deallocated using an explicit destructor call followed by 234/// @c Context.Deallocate(Ptr). 235/// 236/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 237/// @param C The MCContext that provides the allocator. 238/// @param Alignment The alignment of the allocated memory (if the underlying 239/// allocator supports it). 240/// @return The allocated memory. Could be NULL. 241inline void *operator new(size_t Bytes, llvm::MCContext &C, 242 size_t Alignment = 16) throw () { 243 return C.Allocate(Bytes, Alignment); 244} 245/// @brief Placement delete companion to the new above. 246/// 247/// This operator is just a companion to the new above. There is no way of 248/// invoking it directly; see the new operator for more details. This operator 249/// is called implicitly by the compiler if a placement new expression using 250/// the MCContext throws in the object constructor. 251inline void operator delete(void *Ptr, llvm::MCContext &C, size_t) 252 throw () { 253 C.Deallocate(Ptr); 254} 255 256/// This placement form of operator new[] uses the MCContext's allocator for 257/// obtaining memory. It is a non-throwing new[], which means that it returns 258/// null on error. 259/// Usage looks like this (assuming there's an MCContext 'Context' in scope): 260/// @code 261/// // Default alignment (16) 262/// char *data = new (Context) char[10]; 263/// // Specific alignment 264/// char *data = new (Context, 8) char[10]; 265/// @endcode 266/// Please note that you cannot use delete on the pointer; it must be 267/// deallocated using an explicit destructor call followed by 268/// @c Context.Deallocate(Ptr). 269/// 270/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 271/// @param C The MCContext that provides the allocator. 272/// @param Alignment The alignment of the allocated memory (if the underlying 273/// allocator supports it). 274/// @return The allocated memory. Could be NULL. 275inline void *operator new[](size_t Bytes, llvm::MCContext& C, 276 size_t Alignment = 16) throw () { 277 return C.Allocate(Bytes, Alignment); 278} 279 280/// @brief Placement delete[] companion to the new[] above. 281/// 282/// This operator is just a companion to the new[] above. There is no way of 283/// invoking it directly; see the new[] operator for more details. This operator 284/// is called implicitly by the compiler if a placement new[] expression using 285/// the MCContext throws in the object constructor. 286inline void operator delete[](void *Ptr, llvm::MCContext &C) throw () { 287 C.Deallocate(Ptr); 288} 289 290#endif 291