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182 lines
7.4 KiB
C++
182 lines
7.4 KiB
C++
//===- MCSectionMachO.h - MachO Machine Code Sections -----------*- 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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//
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// This file declares the MCSectionMachO class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCSECTIONMACHO_H
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#define LLVM_MC_MCSECTIONMACHO_H
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#include "llvm/MC/MCSection.h"
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namespace llvm {
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/// MCSectionMachO - This represents a section on a Mach-O system (used by
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/// Mac OS X). On a Mac system, these are also described in
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/// /usr/include/mach-o/loader.h.
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class MCSectionMachO : public MCSection {
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char SegmentName[16]; // Not necessarily null terminated!
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char SectionName[16]; // Not necessarily null terminated!
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/// TypeAndAttributes - This is the SECTION_TYPE and SECTION_ATTRIBUTES
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/// field of a section, drawn from the enums below.
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unsigned TypeAndAttributes;
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/// Reserved2 - The 'reserved2' field of a section, used to represent the
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/// size of stubs, for example.
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unsigned Reserved2;
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MCSectionMachO(StringRef Segment, StringRef Section,
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unsigned TAA, unsigned reserved2, SectionKind K);
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friend class MCContext;
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public:
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/// These are the section type and attributes fields. A MachO section can
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/// have only one Type, but can have any of the attributes specified.
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enum {
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// TypeAndAttributes bitmasks.
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SECTION_TYPE = 0x000000FFU,
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SECTION_ATTRIBUTES = 0xFFFFFF00U,
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// Valid section types.
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/// S_REGULAR - Regular section.
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S_REGULAR = 0x00U,
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/// S_ZEROFILL - Zero fill on demand section.
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S_ZEROFILL = 0x01U,
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/// S_CSTRING_LITERALS - Section with literal C strings.
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S_CSTRING_LITERALS = 0x02U,
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/// S_4BYTE_LITERALS - Section with 4 byte literals.
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S_4BYTE_LITERALS = 0x03U,
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/// S_8BYTE_LITERALS - Section with 8 byte literals.
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S_8BYTE_LITERALS = 0x04U,
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/// S_LITERAL_POINTERS - Section with pointers to literals.
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S_LITERAL_POINTERS = 0x05U,
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/// S_NON_LAZY_SYMBOL_POINTERS - Section with non-lazy symbol pointers.
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S_NON_LAZY_SYMBOL_POINTERS = 0x06U,
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/// S_LAZY_SYMBOL_POINTERS - Section with lazy symbol pointers.
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S_LAZY_SYMBOL_POINTERS = 0x07U,
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/// S_SYMBOL_STUBS - Section with symbol stubs, byte size of stub in
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/// the Reserved2 field.
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S_SYMBOL_STUBS = 0x08U,
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/// S_MOD_INIT_FUNC_POINTERS - Section with only function pointers for
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/// initialization.
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S_MOD_INIT_FUNC_POINTERS = 0x09U,
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/// S_MOD_TERM_FUNC_POINTERS - Section with only function pointers for
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/// termination.
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S_MOD_TERM_FUNC_POINTERS = 0x0AU,
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/// S_COALESCED - Section contains symbols that are to be coalesced.
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S_COALESCED = 0x0BU,
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/// S_GB_ZEROFILL - Zero fill on demand section (that can be larger than 4
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/// gigabytes).
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S_GB_ZEROFILL = 0x0CU,
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/// S_INTERPOSING - Section with only pairs of function pointers for
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/// interposing.
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S_INTERPOSING = 0x0DU,
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/// S_16BYTE_LITERALS - Section with only 16 byte literals.
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S_16BYTE_LITERALS = 0x0EU,
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/// S_DTRACE_DOF - Section contains DTrace Object Format.
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S_DTRACE_DOF = 0x0FU,
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/// S_LAZY_DYLIB_SYMBOL_POINTERS - Section with lazy symbol pointers to
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/// lazy loaded dylibs.
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S_LAZY_DYLIB_SYMBOL_POINTERS = 0x10U,
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/// S_THREAD_LOCAL_REGULAR - Section with ....
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S_THREAD_LOCAL_REGULAR = 0x11U,
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/// S_THREAD_LOCAL_ZEROFILL - Thread local zerofill section.
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S_THREAD_LOCAL_ZEROFILL = 0x12U,
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/// S_THREAD_LOCAL_VARIABLES - Section with thread local variable structure
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/// data.
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S_THREAD_LOCAL_VARIABLES = 0x13U,
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/// S_THREAD_LOCAL_VARIABLE_POINTERS - Section with ....
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S_THREAD_LOCAL_VARIABLE_POINTERS = 0x14U,
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/// S_THREAD_LOCAL_INIT_FUNCTION_POINTERS - Section with thread local
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/// variable initialization pointers to functions.
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S_THREAD_LOCAL_INIT_FUNCTION_POINTERS = 0x15U,
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LAST_KNOWN_SECTION_TYPE = S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
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// Valid section attributes.
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/// S_ATTR_PURE_INSTRUCTIONS - Section contains only true machine
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/// instructions.
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S_ATTR_PURE_INSTRUCTIONS = 1U << 31,
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/// S_ATTR_NO_TOC - Section contains coalesced symbols that are not to be
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/// in a ranlib table of contents.
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S_ATTR_NO_TOC = 1U << 30,
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/// S_ATTR_STRIP_STATIC_SYMS - Ok to strip static symbols in this section
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/// in files with the MY_DYLDLINK flag.
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S_ATTR_STRIP_STATIC_SYMS = 1U << 29,
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/// S_ATTR_NO_DEAD_STRIP - No dead stripping.
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S_ATTR_NO_DEAD_STRIP = 1U << 28,
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/// S_ATTR_LIVE_SUPPORT - Blocks are live if they reference live blocks.
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S_ATTR_LIVE_SUPPORT = 1U << 27,
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/// S_ATTR_SELF_MODIFYING_CODE - Used with i386 code stubs written on by
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/// dyld.
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S_ATTR_SELF_MODIFYING_CODE = 1U << 26,
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/// S_ATTR_DEBUG - A debug section.
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S_ATTR_DEBUG = 1U << 25,
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/// S_ATTR_SOME_INSTRUCTIONS - Section contains some machine instructions.
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S_ATTR_SOME_INSTRUCTIONS = 1U << 10,
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/// S_ATTR_EXT_RELOC - Section has external relocation entries.
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S_ATTR_EXT_RELOC = 1U << 9,
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/// S_ATTR_LOC_RELOC - Section has local relocation entries.
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S_ATTR_LOC_RELOC = 1U << 8
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};
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StringRef getSegmentName() const {
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// SegmentName is not necessarily null terminated!
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if (SegmentName[15])
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return StringRef(SegmentName, 16);
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return StringRef(SegmentName);
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}
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StringRef getSectionName() const {
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// SectionName is not necessarily null terminated!
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if (SectionName[15])
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return StringRef(SectionName, 16);
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return StringRef(SectionName);
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}
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unsigned getTypeAndAttributes() const { return TypeAndAttributes; }
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unsigned getStubSize() const { return Reserved2; }
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unsigned getType() const { return TypeAndAttributes & SECTION_TYPE; }
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bool hasAttribute(unsigned Value) const {
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return (TypeAndAttributes & Value) != 0;
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}
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/// ParseSectionSpecifier - Parse the section specifier indicated by "Spec".
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/// This is a string that can appear after a .section directive in a mach-o
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/// flavored .s file. If successful, this fills in the specified Out
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/// parameters and returns an empty string. When an invalid section
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/// specifier is present, this returns a string indicating the problem.
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/// If no TAA was parsed, TAA is not altered, and TAAWasSet becomes false.
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static std::string ParseSectionSpecifier(StringRef Spec, // In.
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StringRef &Segment, // Out.
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StringRef &Section, // Out.
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unsigned &TAA, // Out.
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bool &TAAParsed, // Out.
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unsigned &StubSize); // Out.
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virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
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raw_ostream &OS) const;
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virtual bool UseCodeAlign() const;
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virtual bool isVirtualSection() const;
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static bool classof(const MCSection *S) {
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return S->getVariant() == SV_MachO;
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}
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static bool classof(const MCSectionMachO *) { return true; }
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};
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} // end namespace llvm
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#endif
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