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 // FIXME: Why don't we always use this section?
60 SixteenByteConstantSection = getUnnamedSection("\t.literal16\n",
61 SectionFlags::Mergeable);
62 LCOMMDirective = "\t.lcomm\t";
64 // Leopard and above support aligned common symbols.
65 COMMDirectiveTakesAlignment = (Subtarget->getDarwinVers() >= 9);
66 HasDotTypeDotSizeDirective = false;
69 PersonalityPrefix = "";
70 PersonalitySuffix = "+4@GOTPCREL";
72 PersonalityPrefix = "L";
73 PersonalitySuffix = "$non_lazy_ptr";
76 InlineAsmStart = "## InlineAsm Start";
77 InlineAsmEnd = "## InlineAsm End";
79 SetDirective = "\t.set";
81 UsedDirective = "\t.no_dead_strip\t";
82 ProtectedDirective = "\t.globl\t";
84 SupportsDebugInformation = true;
85 DwarfDebugInlineSection = ".section __DWARF,__debug_inlined,regular,debug";
86 DwarfUsesInlineInfoSection = true;
88 // Exceptions handling
89 SupportsExceptionHandling = true;
90 GlobalEHDirective = "\t.globl\t";
91 SupportsWeakOmittedEHFrame = false;
92 AbsoluteEHSectionOffsets = false;
94 ".section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support";
95 DwarfExceptionSection = ".section __DATA,__gcc_except_tab";
99 X86DarwinTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
101 if (Reason == DwarfEncoding::Functions && Global)
102 return (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4);
103 else if (Reason == DwarfEncoding::CodeLabels || !Global)
104 return DW_EH_PE_pcrel;
106 return DW_EH_PE_absptr;
110 X86DarwinTargetAsmInfo::getEHGlobalPrefix() const
112 const X86Subtarget* Subtarget = &TM.getSubtarget<X86Subtarget>();
113 if (Subtarget->getDarwinVers() > 9)
114 return PrivateGlobalPrefix;
119 X86ELFTargetAsmInfo::X86ELFTargetAsmInfo(const X86TargetMachine &TM):
120 X86TargetAsmInfo<ELFTargetAsmInfo>(TM) {
122 CStringSection = ".rodata.str";
123 PrivateGlobalPrefix = ".L";
124 WeakRefDirective = "\t.weak\t";
125 SetDirective = "\t.set\t";
128 // Set up DWARF directives
129 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
132 AbsoluteDebugSectionOffsets = true;
133 SupportsDebugInformation = true;
134 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
135 DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
136 DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
137 DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
138 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
139 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
140 DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
141 DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
142 DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
143 DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
144 DwarfMacroInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
146 // Exceptions handling
147 SupportsExceptionHandling = true;
148 AbsoluteEHSectionOffsets = false;
149 DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
150 DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@progbits";
152 // On Linux we must declare when we can use a non-executable stack.
153 if (TM.getSubtarget<X86Subtarget>().isLinux())
154 NonexecutableStackDirective = "\t.section\t.note.GNU-stack,\"\",@progbits";
158 X86ELFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
160 CodeModel::Model CM = TM.getCodeModel();
161 bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
163 if (TM.getRelocationModel() == Reloc::PIC_) {
167 // 32 bit targets always encode pointers as 4 bytes
168 Format = DW_EH_PE_sdata4;
170 // 64 bit targets encode pointers in 4 bytes iff:
171 // - code model is small OR
172 // - code model is medium and we're emitting externally visible symbols
173 // or any code symbols
174 if (CM == CodeModel::Small ||
175 (CM == CodeModel::Medium && (Global ||
176 Reason != DwarfEncoding::Data)))
177 Format = DW_EH_PE_sdata4;
179 Format = DW_EH_PE_sdata8;
183 Format |= DW_EH_PE_indirect;
185 return (Format | DW_EH_PE_pcrel);
188 (CM == CodeModel::Small ||
189 (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
190 return DW_EH_PE_udata4;
192 return DW_EH_PE_absptr;
196 X86COFFTargetAsmInfo::X86COFFTargetAsmInfo(const X86TargetMachine &TM):
197 X86GenericTargetAsmInfo(TM) {
200 LCOMMDirective = "\t.lcomm\t";
201 COMMDirectiveTakesAlignment = false;
202 HasDotTypeDotSizeDirective = false;
203 HasSingleParameterDotFile = false;
204 StaticCtorsSection = "\t.section .ctors,\"aw\"";
205 StaticDtorsSection = "\t.section .dtors,\"aw\"";
206 HiddenDirective = NULL;
207 PrivateGlobalPrefix = "L"; // Prefix for private global symbols
208 WeakRefDirective = "\t.weak\t";
209 SetDirective = "\t.set\t";
211 // Set up DWARF directives
212 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
213 AbsoluteDebugSectionOffsets = true;
214 AbsoluteEHSectionOffsets = false;
215 SupportsDebugInformation = true;
216 DwarfSectionOffsetDirective = "\t.secrel32\t";
217 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"dr\"";
218 DwarfInfoSection = "\t.section\t.debug_info,\"dr\"";
219 DwarfLineSection = "\t.section\t.debug_line,\"dr\"";
220 DwarfFrameSection = "\t.section\t.debug_frame,\"dr\"";
221 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"dr\"";
222 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"dr\"";
223 DwarfStrSection = "\t.section\t.debug_str,\"dr\"";
224 DwarfLocSection = "\t.section\t.debug_loc,\"dr\"";
225 DwarfARangesSection = "\t.section\t.debug_aranges,\"dr\"";
226 DwarfRangesSection = "\t.section\t.debug_ranges,\"dr\"";
227 DwarfMacroInfoSection = "\t.section\t.debug_macinfo,\"dr\"";
231 X86COFFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
233 CodeModel::Model CM = TM.getCodeModel();
234 bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
236 if (TM.getRelocationModel() == Reloc::PIC_) {
240 // 32 bit targets always encode pointers as 4 bytes
241 Format = DW_EH_PE_sdata4;
243 // 64 bit targets encode pointers in 4 bytes iff:
244 // - code model is small OR
245 // - code model is medium and we're emitting externally visible symbols
246 // or any code symbols
247 if (CM == CodeModel::Small ||
248 (CM == CodeModel::Medium && (Global ||
249 Reason != DwarfEncoding::Data)))
250 Format = DW_EH_PE_sdata4;
252 Format = DW_EH_PE_sdata8;
256 Format |= DW_EH_PE_indirect;
258 return (Format | DW_EH_PE_pcrel);
262 (CM == CodeModel::Small ||
263 (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
264 return DW_EH_PE_udata4;
265 return DW_EH_PE_absptr;
268 const char *X86COFFTargetAsmInfo::
269 getSectionPrefixForUniqueGlobal(SectionKind::Kind Kind) const {
271 default: llvm_unreachable("Unknown section kind");
272 case SectionKind::Text: return ".text$linkonce";
273 case SectionKind::Data:
274 case SectionKind::DataRelLocal:
275 case SectionKind::DataRel:
276 case SectionKind::BSS:
277 case SectionKind::ThreadData:
278 case SectionKind::ThreadBSS: return ".data$linkonce";
279 case SectionKind::ROData:
280 case SectionKind::DataRelRO:
281 case SectionKind::DataRelROLocal:
282 case SectionKind::RODataMergeConst:
283 case SectionKind::RODataMergeStr: return ".rdata$linkonce";
287 std::string X86COFFTargetAsmInfo::printSectionFlags(unsigned flags) const {
288 std::string Flags = ",\"";
290 if (flags & SectionFlags::Code)
292 if (flags & SectionFlags::Writable)
300 X86WinTargetAsmInfo::X86WinTargetAsmInfo(const X86TargetMachine &TM):
301 X86GenericTargetAsmInfo(TM) {
305 InlineAsmStart = "; InlineAsm Start";
306 InlineAsmEnd = "; InlineAsm End";
308 PrivateGlobalPrefix = "$";
309 AlignDirective = "\tALIGN\t";
310 ZeroDirective = "\tdb\t";
311 ZeroDirectiveSuffix = " dup(0)";
312 AsciiDirective = "\tdb\t";
314 Data8bitsDirective = "\tdb\t";
315 Data16bitsDirective = "\tdw\t";
316 Data32bitsDirective = "\tdd\t";
317 Data64bitsDirective = "\tdq\t";
318 HasDotTypeDotSizeDirective = false;
319 HasSingleParameterDotFile = false;
321 AlignmentIsInBytes = true;
323 TextSection = getUnnamedSection("_text", SectionFlags::Code);
324 DataSection = getUnnamedSection("_data", SectionFlags::Writable);
326 JumpTableDataSection = NULL;
327 SwitchToSectionDirective = "";
328 TextSectionStartSuffix = "\tSEGMENT PARA 'CODE'";
329 DataSectionStartSuffix = "\tSEGMENT PARA 'DATA'";
330 SectionEndDirectiveSuffix = "\tends\n";
333 // Instantiate default implementation.
334 TEMPLATE_INSTANTIATION(class X86TargetAsmInfo<TargetAsmInfo>);