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Eugene Zelenkod3a6c892017-02-11 00:27:28 +00001//===- MCAsmInfoDarwin.cpp - Darwin asm properties ------------------------===//
Anton Korobeynikovc1874382008-07-19 13:14:46 +00002//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines target asm properties related what form asm statements
11// should take in general on Darwin-based targets
12//
13//===----------------------------------------------------------------------===//
14
Chris Lattner7b26fce2009-08-22 20:48:53 +000015#include "llvm/MC/MCAsmInfoDarwin.h"
Eugene Zelenkod3a6c892017-02-11 00:27:28 +000016#include "llvm/MC/MCDirectives.h"
Lang Hames1e923ec2015-01-09 18:55:42 +000017#include "llvm/MC/MCSectionMachO.h"
Eugene Zelenkod3a6c892017-02-11 00:27:28 +000018#include "llvm/Support/MachO.h"
19
Anton Korobeynikovc1874382008-07-19 13:14:46 +000020using namespace llvm;
21
Lang Hames1e923ec2015-01-09 18:55:42 +000022bool MCAsmInfoDarwin::isSectionAtomizableBySymbols(
23 const MCSection &Section) const {
24 const MCSectionMachO &SMO = static_cast<const MCSectionMachO &>(Section);
25
26 // Sections holding 1 byte strings are atomized based on the data they
27 // contain.
28 // Sections holding 2 byte strings require symbols in order to be atomized.
29 // There is no dedicated section for 4 byte strings.
Rafael Espindola26585542015-01-19 21:11:14 +000030 if (SMO.getType() == MachO::S_CSTRING_LITERALS)
Lang Hames1e923ec2015-01-09 18:55:42 +000031 return false;
32
33 if (SMO.getSegmentName() == "__DATA" && SMO.getSectionName() == "__cfstring")
34 return false;
35
Rafael Espindolae4bcad42015-02-12 23:11:59 +000036 if (SMO.getSegmentName() == "__DATA" &&
37 SMO.getSectionName() == "__objc_classrefs")
38 return false;
39
Lang Hames1e923ec2015-01-09 18:55:42 +000040 switch (SMO.getType()) {
41 default:
42 return true;
43
44 // These sections are atomized at the element boundaries without using
45 // symbols.
46 case MachO::S_4BYTE_LITERALS:
47 case MachO::S_8BYTE_LITERALS:
48 case MachO::S_16BYTE_LITERALS:
49 case MachO::S_LITERAL_POINTERS:
50 case MachO::S_NON_LAZY_SYMBOL_POINTERS:
51 case MachO::S_LAZY_SYMBOL_POINTERS:
Tim Northover5c3140f2016-04-25 21:12:04 +000052 case MachO::S_THREAD_LOCAL_VARIABLE_POINTERS:
Lang Hames1e923ec2015-01-09 18:55:42 +000053 case MachO::S_MOD_INIT_FUNC_POINTERS:
54 case MachO::S_MOD_TERM_FUNC_POINTERS:
55 case MachO::S_INTERPOSING:
56 return false;
57 }
58}
David Blaikiea379b1812011-12-20 02:50:00 +000059
Chris Lattner2b4364f2010-01-20 06:34:14 +000060MCAsmInfoDarwin::MCAsmInfoDarwin() {
Chris Lattner8284b662009-06-19 00:08:39 +000061 // Common settings for all Darwin targets.
62 // Syntax:
Tim Northover56276702014-03-29 07:33:24 +000063 LinkerPrivateGlobalPrefix = "l";
Chris Lattner8284b662009-06-19 00:08:39 +000064 HasSingleParameterDotFile = false;
Chris Lattner76bdea32010-01-23 07:21:06 +000065 HasSubsectionsViaSymbols = true;
Chris Lattner8284b662009-06-19 00:08:39 +000066
Chris Lattner54075a72009-08-11 22:31:42 +000067 AlignmentIsInBytes = false;
Rafael Espindoladcb03f02010-01-26 20:21:43 +000068 COMMDirectiveAlignmentIsInBytes = false;
Benjamin Kramer68b9f052012-09-07 21:08:01 +000069 LCOMMDirectiveAlignmentType = LCOMM::Log2Alignment;
Chris Lattnerabdcbc72009-08-11 22:39:40 +000070 InlineAsmStart = " InlineAsm Start";
71 InlineAsmEnd = " InlineAsm End";
Chris Lattner54075a72009-08-11 22:31:42 +000072
Chris Lattner8284b662009-06-19 00:08:39 +000073 // Directives:
Rafael Espindola04867ce2013-12-02 23:04:51 +000074 HasWeakDefDirective = true;
David Fang1b018492013-12-10 21:37:41 +000075 HasWeakDefCanBeHiddenDirective = true;
Chris Lattner8284b662009-06-19 00:08:39 +000076 WeakRefDirective = "\t.weak_reference ";
Chris Lattnerd832c8e2009-08-11 22:17:31 +000077 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
Chris Lattner1d371882010-01-19 02:09:44 +000078 HasMachoZeroFillDirective = true; // Uses .zerofill
Eric Christopher27e7ffc2010-05-20 00:49:07 +000079 HasMachoTBSSDirective = true; // Uses .tbss
Rafael Espindola1048e752010-12-04 00:31:13 +000080
Rafael Espindolaa6cd2d82010-12-22 21:51:29 +000081 // FIXME: Change this once MC is the system assembler.
82 HasAggressiveSymbolFolding = false;
83
Chris Lattner0bfd2792010-01-23 06:53:23 +000084 HiddenVisibilityAttr = MCSA_PrivateExtern;
Stuart Hastingsbf836592011-02-23 02:27:05 +000085 HiddenDeclarationVisibilityAttr = MCSA_Invalid;
Bill Wendling11b98942011-11-29 02:39:58 +000086
Chris Lattner0bfd2792010-01-23 06:53:23 +000087 // Doesn't support protected visibility.
Bill Wendling11b98942011-11-29 02:39:58 +000088 ProtectedVisibilityAttr = MCSA_Invalid;
Jim Grosbachdc1e36e2012-05-11 01:41:30 +000089
Chris Lattner54075a72009-08-11 22:31:42 +000090 HasDotTypeDotSizeDirective = false;
Chris Lattner1deb09c2010-01-23 05:51:36 +000091 HasNoDeadStrip = true;
Lang Hames1b640e02016-03-15 01:43:05 +000092 HasAltEntry = true;
Devang Patelea636392010-08-31 23:50:19 +000093
Nick Lewycky33da3362012-06-22 01:25:12 +000094 DwarfUsesRelocationsAcrossSections = false;
Daniel Sanders753e1762014-02-13 14:44:26 +000095
96 UseIntegratedAssembler = true;
Rafael Espindolac606bfe2014-10-21 01:17:30 +000097 SetDirectiveSuppressesReloc = true;
Anton Korobeynikovc1874382008-07-19 13:14:46 +000098}