101e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu//===- MCSectionMachO.h - MachO Machine Code Sections -----------*- C++ -*-===// 201e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu// 301e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu// The LLVM Compiler Infrastructure 401e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu// 501e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu// This file is distributed under the University of Illinois Open Source 601e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu// License. See LICENSE.TXT for details. 701e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu// 801e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu//===----------------------------------------------------------------------===// 901e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu// 100066c22c40f9cca572e34ec618f7a7ae4e723d2eChia-I Wu// This file declares the MCSectionMachO class. 1101e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu// 1201e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu//===----------------------------------------------------------------------===// 1301e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu 1401e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu#ifndef LLVM_MC_MCSECTIONMACHO_H 1501e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu#define LLVM_MC_MCSECTIONMACHO_H 1601e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu 1701e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu#include "llvm/MC/MCSection.h" 1801e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu 1901e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wunamespace llvm { 2001e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu 2101e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu/// MCSectionMachO - This represents a section on a Mach-O system (used by 2201e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu/// Mac OS X). On a Mac system, these are also described in 2301e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu/// /usr/include/mach-o/loader.h. 2401e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wuclass MCSectionMachO : public MCSection { 2501e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu char SegmentName[16]; // Not necessarily null terminated! 2601e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu char SectionName[16]; // Not necessarily null terminated! 2701e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu 2801e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu /// TypeAndAttributes - This is the SECTION_TYPE and SECTION_ATTRIBUTES 2901e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu /// field of a section, drawn from the enums below. 3001e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu unsigned TypeAndAttributes; 3101e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu 3201e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu /// Reserved2 - The 'reserved2' field of a section, used to represent the 3301e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu /// size of stubs, for example. 3401e3e82a56310932667c60bcca9cc9fdfd8b87c4Chia-I Wu unsigned Reserved2; 359af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu 36eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu MCSectionMachO(StringRef Segment, StringRef Section, 37eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu unsigned TAA, unsigned reserved2, SectionKind K); 38eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu friend class MCContext; 39eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wupublic: 40eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu 41eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// These are the section type and attributes fields. A MachO section can 42eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// have only one Type, but can have any of the attributes specified. 43eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu enum { 44eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu // TypeAndAttributes bitmasks. 45eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu SECTION_TYPE = 0x000000FFU, 46eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu SECTION_ATTRIBUTES = 0xFFFFFF00U, 47eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu 48eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu // Valid section types. 49eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu 50eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_REGULAR - Regular section. 51eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_REGULAR = 0x00U, 52eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_ZEROFILL - Zero fill on demand section. 53eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_ZEROFILL = 0x01U, 54eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_CSTRING_LITERALS - Section with literal C strings. 55eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_CSTRING_LITERALS = 0x02U, 56eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_4BYTE_LITERALS - Section with 4 byte literals. 57eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_4BYTE_LITERALS = 0x03U, 58eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_8BYTE_LITERALS - Section with 8 byte literals. 59eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_8BYTE_LITERALS = 0x04U, 60eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_LITERAL_POINTERS - Section with pointers to literals. 61eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_LITERAL_POINTERS = 0x05U, 62eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_NON_LAZY_SYMBOL_POINTERS - Section with non-lazy symbol pointers. 63eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_NON_LAZY_SYMBOL_POINTERS = 0x06U, 64eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_LAZY_SYMBOL_POINTERS - Section with lazy symbol pointers. 65eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_LAZY_SYMBOL_POINTERS = 0x07U, 66eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_SYMBOL_STUBS - Section with symbol stubs, byte size of stub in 67eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// the Reserved2 field. 68eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_SYMBOL_STUBS = 0x08U, 69eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_MOD_INIT_FUNC_POINTERS - Section with only function pointers for 70eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// initialization. 71eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_MOD_INIT_FUNC_POINTERS = 0x09U, 72eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_MOD_TERM_FUNC_POINTERS - Section with only function pointers for 73eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// termination. 74eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_MOD_TERM_FUNC_POINTERS = 0x0AU, 75eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_COALESCED - Section contains symbols that are to be coalesced. 76eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_COALESCED = 0x0BU, 77eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_GB_ZEROFILL - Zero fill on demand section (that can be larger than 4 78eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// gigabytes). 79eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_GB_ZEROFILL = 0x0CU, 80eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_INTERPOSING - Section with only pairs of function pointers for 81eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// interposing. 82eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_INTERPOSING = 0x0DU, 83eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_16BYTE_LITERALS - Section with only 16 byte literals. 84eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_16BYTE_LITERALS = 0x0EU, 85eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_DTRACE_DOF - Section contains DTrace Object Format. 86eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_DTRACE_DOF = 0x0FU, 87eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_LAZY_DYLIB_SYMBOL_POINTERS - Section with lazy symbol pointers to 88eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// lazy loaded dylibs. 89eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_LAZY_DYLIB_SYMBOL_POINTERS = 0x10U, 90eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_THREAD_LOCAL_REGULAR - Section with .... 91eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_THREAD_LOCAL_REGULAR = 0x11U, 92eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_THREAD_LOCAL_ZEROFILL - Thread local zerofill section. 93eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_THREAD_LOCAL_ZEROFILL = 0x12U, 94eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_THREAD_LOCAL_VARIABLES - Section with thread local variable structure 95eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// data. 96eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_THREAD_LOCAL_VARIABLES = 0x13U, 97eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_THREAD_LOCAL_VARIABLE_POINTERS - Section with .... 98eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_THREAD_LOCAL_VARIABLE_POINTERS = 0x14U, 99eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_THREAD_LOCAL_INIT_FUNCTION_POINTERS - Section with thread local 100eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// variable initialization pointers to functions. 101eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_THREAD_LOCAL_INIT_FUNCTION_POINTERS = 0x15U, 102eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu 103eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu LAST_KNOWN_SECTION_TYPE = S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 104eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu 105eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu 106eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu // Valid section attributes. 107eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu 108e8d297b7a108fcf1cb688fe1db89e83b8f85e091Chia-I Wu /// S_ATTR_PURE_INSTRUCTIONS - Section contains only true machine 109e8d297b7a108fcf1cb688fe1db89e83b8f85e091Chia-I Wu /// instructions. 110e8d297b7a108fcf1cb688fe1db89e83b8f85e091Chia-I Wu S_ATTR_PURE_INSTRUCTIONS = 1U << 31, 111e8d297b7a108fcf1cb688fe1db89e83b8f85e091Chia-I Wu /// S_ATTR_NO_TOC - Section contains coalesced symbols that are not to be 112e8d297b7a108fcf1cb688fe1db89e83b8f85e091Chia-I Wu /// in a ranlib table of contents. 113e8d297b7a108fcf1cb688fe1db89e83b8f85e091Chia-I Wu S_ATTR_NO_TOC = 1U << 30, 114eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_ATTR_STRIP_STATIC_SYMS - Ok to strip static symbols in this section 115eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// in files with the MY_DYLDLINK flag. 116eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_ATTR_STRIP_STATIC_SYMS = 1U << 29, 117eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_ATTR_NO_DEAD_STRIP - No dead stripping. 118eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_ATTR_NO_DEAD_STRIP = 1U << 28, 119eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_ATTR_LIVE_SUPPORT - Blocks are live if they reference live blocks. 120eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_ATTR_LIVE_SUPPORT = 1U << 27, 121eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_ATTR_SELF_MODIFYING_CODE - Used with i386 code stubs written on by 122eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// dyld. 123eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_ATTR_SELF_MODIFYING_CODE = 1U << 26, 124eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_ATTR_DEBUG - A debug section. 125eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_ATTR_DEBUG = 1U << 25, 126eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_ATTR_SOME_INSTRUCTIONS - Section contains some machine instructions. 127eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_ATTR_SOME_INSTRUCTIONS = 1U << 10, 128eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_ATTR_EXT_RELOC - Section has external relocation entries. 129eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_ATTR_EXT_RELOC = 1U << 9, 130eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu /// S_ATTR_LOC_RELOC - Section has local relocation entries. 131eb32ac19569b5f05fc3fa2621b52f2c9fa85556aChia-I Wu S_ATTR_LOC_RELOC = 1U << 8 1329af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu }; 1339af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu 1349af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu StringRef getSegmentName() const { 1359af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu // SegmentName is not necessarily null terminated! 1369af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu if (SegmentName[15]) 1379af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu return StringRef(SegmentName, 16); 1389af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu return StringRef(SegmentName); 1399af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu } 1409af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu StringRef getSectionName() const { 1419af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu // SectionName is not necessarily null terminated! 1429af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu if (SectionName[15]) 1439af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu return StringRef(SectionName, 16); 1449af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu return StringRef(SectionName); 1459af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu } 1469af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu 1479af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu unsigned getTypeAndAttributes() const { return TypeAndAttributes; } 1489af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu unsigned getStubSize() const { return Reserved2; } 1499af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu 1509af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu unsigned getType() const { return TypeAndAttributes & SECTION_TYPE; } 1519af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu bool hasAttribute(unsigned Value) const { 1529af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu return (TypeAndAttributes & Value) != 0; 1539af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu } 1549af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu 1559af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu /// ParseSectionSpecifier - Parse the section specifier indicated by "Spec". 1569af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu /// This is a string that can appear after a .section directive in a mach-o 1579af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu /// flavored .s file. If successful, this fills in the specified Out 1589af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu /// parameters and returns an empty string. When an invalid section 1599af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu /// specifier is present, this returns a string indicating the problem. 1609af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu /// If no TAA was parsed, TAA is not altered, and TAAWasSet becomes false. 1619af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu static std::string ParseSectionSpecifier(StringRef Spec, // In. 1629af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu StringRef &Segment, // Out. 1639af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu StringRef &Section, // Out. 1649af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu unsigned &TAA, // Out. 1659af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu bool &TAAParsed, // Out. 1669af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu unsigned &StubSize); // Out. 1679af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu 1689af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu virtual void PrintSwitchToSection(const MCAsmInfo &MAI, 1699af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu raw_ostream &OS) const; 1709af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu virtual bool UseCodeAlign() const; 1719af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu virtual bool isVirtualSection() const; 1729af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu 1739af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu static bool classof(const MCSection *S) { 1749af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu return S->getVariant() == SV_MachO; 1759af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu } 1769af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu static bool classof(const MCSectionMachO *) { return true; } 1779af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu}; 1789af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu 1799af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu} // end namespace llvm 1809af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu 1819af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu#endif 1829af1fc590d90fdda65aa0cf145773480af52a4e5Chia-I Wu