1 //===-- X86TargetAsmInfo.cpp - X86 asm properties ---------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the declarations of the X86TargetAsmInfo properties.
12 //===----------------------------------------------------------------------===//
14 #include "X86TargetAsmInfo.h"
15 #include "X86TargetMachine.h"
16 #include "X86Subtarget.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/InlineAsm.h"
19 #include "llvm/Instructions.h"
20 #include "llvm/Intrinsics.h"
21 #include "llvm/Module.h"
22 #include "llvm/ADT/StringExtras.h"
23 #include "llvm/Support/Dwarf.h"
24 #include "llvm/Support/ErrorHandling.h"
27 using namespace llvm::dwarf;
29 const char *const llvm::x86_asm_table[] = {
41 X86DarwinTargetAsmInfo::X86DarwinTargetAsmInfo(const X86TargetMachine &TM):
42 X86TargetAsmInfo<DarwinTargetAsmInfo>(TM) {
43 const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
44 bool is64Bit = Subtarget->is64Bit();
46 AlignmentIsInBytes = false;
47 TextAlignFillValue = 0x90;
51 Data64bitsDirective = 0; // we can't emit a 64-bit unit
52 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
53 ZeroFillDirective = "\t.zerofill\t"; // Uses .zerofill
54 if (TM.getRelocationModel() != Reloc::Static)
55 ConstantPoolSection = "\t.const_data";
57 ConstantPoolSection = "\t.const\n";
58 LCOMMDirective = "\t.lcomm\t";
60 // Leopard and above support aligned common symbols.
61 COMMDirectiveTakesAlignment = (Subtarget->getDarwinVers() >= 9);
62 HasDotTypeDotSizeDirective = false;
65 PersonalityPrefix = "";
66 PersonalitySuffix = "+4@GOTPCREL";
68 PersonalityPrefix = "L";
69 PersonalitySuffix = "$non_lazy_ptr";
72 InlineAsmStart = "## InlineAsm Start";
73 InlineAsmEnd = "## InlineAsm End";
75 SetDirective = "\t.set";
77 UsedDirective = "\t.no_dead_strip\t";
78 ProtectedDirective = "\t.globl\t";
80 SupportsDebugInformation = true;
81 DwarfDebugInlineSection = ".section __DWARF,__debug_inlined,regular,debug";
82 DwarfUsesInlineInfoSection = true;
84 // Exceptions handling
85 SupportsExceptionHandling = true;
86 GlobalEHDirective = "\t.globl\t";
87 SupportsWeakOmittedEHFrame = false;
88 AbsoluteEHSectionOffsets = false;
90 ".section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support";
91 DwarfExceptionSection = ".section __DATA,__gcc_except_tab";
94 unsigned X86DarwinTargetAsmInfo::PreferredEHDataFormat() const {
95 const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
96 if (Subtarget->getDarwinVers() > 9)
97 return DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4;
99 return DW_EH_PE_absptr;
103 X86DarwinTargetAsmInfo::getEHGlobalPrefix() const {
104 const X86Subtarget* Subtarget = &TM.getSubtarget<X86Subtarget>();
105 if (Subtarget->getDarwinVers() > 9)
106 return PrivateGlobalPrefix;
110 X86ELFTargetAsmInfo::X86ELFTargetAsmInfo(const X86TargetMachine &TM) :
111 X86TargetAsmInfo<ELFTargetAsmInfo>(TM) {
113 CStringSection = ".rodata.str";
114 PrivateGlobalPrefix = ".L";
115 WeakRefDirective = "\t.weak\t";
116 SetDirective = "\t.set\t";
119 // Set up DWARF directives
120 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
123 AbsoluteDebugSectionOffsets = true;
124 SupportsDebugInformation = true;
125 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
126 DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
127 DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
128 DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
129 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
130 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
131 DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
132 DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
133 DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
134 DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
135 DwarfMacroInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
137 // Exceptions handling
138 SupportsExceptionHandling = true;
139 AbsoluteEHSectionOffsets = false;
140 DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
141 DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@progbits";
143 // On Linux we must declare when we can use a non-executable stack.
144 if (TM.getSubtarget<X86Subtarget>().isLinux())
145 NonexecutableStackDirective = "\t.section\t.note.GNU-stack,\"\",@progbits";
149 X86ELFTargetAsmInfo::PreferredEHDataFormat() const {
150 CodeModel::Model CM = TM.getCodeModel();
151 bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
153 if (TM.getRelocationModel() == Reloc::PIC_) {
157 // 32 bit targets always encode pointers as 4 bytes
158 Format = DW_EH_PE_sdata4;
160 // 64 bit targets encode pointers in 4 bytes iff:
161 // - code model is small OR
162 // - code model is medium and we're emitting externally visible symbols
163 // or any code symbols
164 if (CM == CodeModel::Small || CM == CodeModel::Medium)
165 Format = DW_EH_PE_sdata4;
167 Format = DW_EH_PE_sdata8;
170 Format |= DW_EH_PE_indirect;
171 return (Format | DW_EH_PE_pcrel);
174 if (is64Bit && CM == CodeModel::Small)
175 return DW_EH_PE_udata4;
176 return DW_EH_PE_absptr;
181 X86COFFTargetAsmInfo::PreferredEHDataFormat() const {
182 CodeModel::Model CM = TM.getCodeModel();
183 bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
185 if (TM.getRelocationModel() == Reloc::PIC_) {
189 // 32 bit targets always encode pointers as 4 bytes
190 Format = DW_EH_PE_sdata4;
192 // 64 bit targets encode pointers in 4 bytes iff:
193 // - code model is small OR
194 // - code model is medium and we're emitting externally visible symbols
195 // or any code symbols
196 if (CM == CodeModel::Small || CM == CodeModel::Medium)
197 Format = DW_EH_PE_sdata4;
199 Format = DW_EH_PE_sdata8;
202 Format |= DW_EH_PE_indirect;
203 return (Format | DW_EH_PE_pcrel);
206 if (is64Bit && CM == CodeModel::Small)
207 return DW_EH_PE_udata4;
208 return DW_EH_PE_absptr;
213 X86WinTargetAsmInfo::X86WinTargetAsmInfo(const X86TargetMachine &TM):
214 X86TargetAsmInfo<TargetAsmInfo>(TM) {
218 InlineAsmStart = "; InlineAsm Start";
219 InlineAsmEnd = "; InlineAsm End";
221 PrivateGlobalPrefix = "$";
222 AlignDirective = "\tALIGN\t";
223 ZeroDirective = "\tdb\t";
224 ZeroDirectiveSuffix = " dup(0)";
225 AsciiDirective = "\tdb\t";
227 Data8bitsDirective = "\tdb\t";
228 Data16bitsDirective = "\tdw\t";
229 Data32bitsDirective = "\tdd\t";
230 Data64bitsDirective = "\tdq\t";
231 HasDotTypeDotSizeDirective = false;
232 HasSingleParameterDotFile = false;
234 AlignmentIsInBytes = true;
236 JumpTableDataSection = NULL;
237 SwitchToSectionDirective = "";
238 TextSectionStartSuffix = "\tSEGMENT PARA 'CODE'";
239 DataSectionStartSuffix = "\tSEGMENT PARA 'DATA'";
240 SectionEndDirectiveSuffix = "\tends\n";
243 // Instantiate default implementation.
244 TEMPLATE_INSTANTIATION(class X86TargetAsmInfo<TargetAsmInfo>);