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"
26 using namespace llvm::dwarf;
28 const char *const llvm::x86_asm_table[] = {
40 X86DarwinTargetAsmInfo::X86DarwinTargetAsmInfo(const X86TargetMachine &TM):
41 X86TargetAsmInfo<DarwinTargetAsmInfo>(TM) {
42 const X86Subtarget* Subtarget = &TM.getSubtarget<X86Subtarget>();
43 bool is64Bit = Subtarget->is64Bit();
45 AlignmentIsInBytes = false;
46 TextAlignFillValue = 0x90;
49 Data64bitsDirective = 0; // we can't emit a 64-bit unit
50 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
51 PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
52 LessPrivateGlobalPrefix = "l"; // Marker for some ObjC metadata
53 BSSSection = 0; // no BSS section.
54 ZeroFillDirective = "\t.zerofill\t"; // Uses .zerofill
55 if (TM.getRelocationModel() != Reloc::Static)
56 ConstantPoolSection = "\t.const_data";
58 ConstantPoolSection = "\t.const\n";
59 JumpTableDataSection = "\t.const\n";
60 CStringSection = "\t.cstring";
61 // FIXME: Why don't always use this section?
63 SixteenByteConstantSection = getUnnamedSection("\t.literal16\n",
64 SectionFlags::Mergeable);
66 LCOMMDirective = "\t.lcomm\t";
67 SwitchToSectionDirective = "\t.section ";
68 StringConstantPrefix = "\1LC";
69 // Leopard and above support aligned common symbols.
70 COMMDirectiveTakesAlignment = (Subtarget->getDarwinVers() >= 9);
71 HasDotTypeDotSizeDirective = false;
72 HasSingleParameterDotFile = false;
73 if (TM.getRelocationModel() == Reloc::Static) {
74 StaticCtorsSection = ".constructor";
75 StaticDtorsSection = ".destructor";
77 StaticCtorsSection = ".mod_init_func";
78 StaticDtorsSection = ".mod_term_func";
81 PersonalityPrefix = "";
82 PersonalitySuffix = "+4@GOTPCREL";
84 PersonalityPrefix = "L";
85 PersonalitySuffix = "$non_lazy_ptr";
87 NeedsIndirectEncoding = true;
88 InlineAsmStart = "## InlineAsm Start";
89 InlineAsmEnd = "## InlineAsm End";
91 SetDirective = "\t.set";
93 UsedDirective = "\t.no_dead_strip\t";
94 WeakDefDirective = "\t.weak_definition ";
95 WeakRefDirective = "\t.weak_reference ";
96 HiddenDirective = "\t.private_extern ";
97 ProtectedDirective = "\t.globl\t";
99 // In non-PIC modes, emit a special label before jump tables so that the
100 // linker can perform more accurate dead code stripping.
101 if (TM.getRelocationModel() != Reloc::PIC_) {
102 // Emit a local label that is preserved until the linker runs.
103 JumpTableSpecialLabelPrefix = "l";
106 SupportsDebugInformation = true;
108 DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
109 DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
110 DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
111 DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
112 DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
113 DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
114 DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
115 DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
116 DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
117 DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
118 DwarfMacInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
120 // Exceptions handling
121 SupportsExceptionHandling = true;
122 GlobalEHDirective = "\t.globl\t";
123 SupportsWeakOmittedEHFrame = false;
124 AbsoluteEHSectionOffsets = false;
125 DwarfEHFrameSection =
126 ".section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support";
127 DwarfExceptionSection = ".section __DATA,__gcc_except_tab";
131 X86DarwinTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
133 if (Reason == DwarfEncoding::Functions && Global)
134 return (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4);
135 else if (Reason == DwarfEncoding::CodeLabels || !Global)
136 return DW_EH_PE_pcrel;
138 return DW_EH_PE_absptr;
141 X86ELFTargetAsmInfo::X86ELFTargetAsmInfo(const X86TargetMachine &TM):
142 X86TargetAsmInfo<ELFTargetAsmInfo>(TM) {
144 CStringSection = ".rodata.str";
145 PrivateGlobalPrefix = ".L";
146 WeakRefDirective = "\t.weak\t";
147 SetDirective = "\t.set\t";
150 // Set up DWARF directives
151 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
154 AbsoluteDebugSectionOffsets = true;
155 SupportsDebugInformation = true;
156 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
157 DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
158 DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
159 DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
160 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
161 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
162 DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
163 DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
164 DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
165 DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
166 DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
168 // Exceptions handling
169 SupportsExceptionHandling = true;
170 AbsoluteEHSectionOffsets = false;
171 DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
172 DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@progbits";
174 // On Linux we must declare when we can use a non-executable stack.
175 if (TM.getSubtarget<X86Subtarget>().isLinux())
176 NonexecutableStackDirective = "\t.section\t.note.GNU-stack,\"\",@progbits";
180 X86ELFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
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 ||
197 (CM == CodeModel::Medium && (Global ||
198 Reason != DwarfEncoding::Data)))
199 Format = DW_EH_PE_sdata4;
201 Format = DW_EH_PE_sdata8;
205 Format |= DW_EH_PE_indirect;
207 return (Format | DW_EH_PE_pcrel);
210 (CM == CodeModel::Small ||
211 (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
212 return DW_EH_PE_udata4;
214 return DW_EH_PE_absptr;
218 X86COFFTargetAsmInfo::X86COFFTargetAsmInfo(const X86TargetMachine &TM):
219 X86GenericTargetAsmInfo(TM) {
222 LCOMMDirective = "\t.lcomm\t";
223 COMMDirectiveTakesAlignment = false;
224 HasDotTypeDotSizeDirective = false;
225 HasSingleParameterDotFile = false;
226 StaticCtorsSection = "\t.section .ctors,\"aw\"";
227 StaticDtorsSection = "\t.section .dtors,\"aw\"";
228 HiddenDirective = NULL;
229 PrivateGlobalPrefix = "L"; // Prefix for private global symbols
230 WeakRefDirective = "\t.weak\t";
231 SetDirective = "\t.set\t";
233 // Set up DWARF directives
234 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
235 AbsoluteDebugSectionOffsets = true;
236 AbsoluteEHSectionOffsets = false;
237 SupportsDebugInformation = true;
238 DwarfSectionOffsetDirective = "\t.secrel32\t";
239 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"dr\"";
240 DwarfInfoSection = "\t.section\t.debug_info,\"dr\"";
241 DwarfLineSection = "\t.section\t.debug_line,\"dr\"";
242 DwarfFrameSection = "\t.section\t.debug_frame,\"dr\"";
243 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"dr\"";
244 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"dr\"";
245 DwarfStrSection = "\t.section\t.debug_str,\"dr\"";
246 DwarfLocSection = "\t.section\t.debug_loc,\"dr\"";
247 DwarfARangesSection = "\t.section\t.debug_aranges,\"dr\"";
248 DwarfRangesSection = "\t.section\t.debug_ranges,\"dr\"";
249 DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"dr\"";
253 X86COFFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
255 CodeModel::Model CM = TM.getCodeModel();
256 bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
258 if (TM.getRelocationModel() == Reloc::PIC_) {
262 // 32 bit targets always encode pointers as 4 bytes
263 Format = DW_EH_PE_sdata4;
265 // 64 bit targets encode pointers in 4 bytes iff:
266 // - code model is small OR
267 // - code model is medium and we're emitting externally visible symbols
268 // or any code symbols
269 if (CM == CodeModel::Small ||
270 (CM == CodeModel::Medium && (Global ||
271 Reason != DwarfEncoding::Data)))
272 Format = DW_EH_PE_sdata4;
274 Format = DW_EH_PE_sdata8;
278 Format |= DW_EH_PE_indirect;
280 return (Format | DW_EH_PE_pcrel);
283 (CM == CodeModel::Small ||
284 (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
285 return DW_EH_PE_udata4;
287 return DW_EH_PE_absptr;
292 X86COFFTargetAsmInfo::UniqueSectionForGlobal(const GlobalValue* GV,
293 SectionKind::Kind kind) const {
295 case SectionKind::Text:
296 return ".text$linkonce" + GV->getName();
297 case SectionKind::Data:
298 case SectionKind::BSS:
299 case SectionKind::ThreadData:
300 case SectionKind::ThreadBSS:
301 return ".data$linkonce" + GV->getName();
302 case SectionKind::ROData:
303 case SectionKind::RODataMergeConst:
304 case SectionKind::RODataMergeStr:
305 return ".rdata$linkonce" + GV->getName();
307 assert(0 && "Unknown section kind");
311 std::string X86COFFTargetAsmInfo::printSectionFlags(unsigned flags) const {
312 std::string Flags = ",\"";
314 if (flags & SectionFlags::Code)
316 if (flags & SectionFlags::Writeable)
324 X86WinTargetAsmInfo::X86WinTargetAsmInfo(const X86TargetMachine &TM):
325 X86GenericTargetAsmInfo(TM) {
329 PrivateGlobalPrefix = "$";
330 AlignDirective = "\talign\t";
331 ZeroDirective = "\tdb\t";
332 ZeroDirectiveSuffix = " dup(0)";
333 AsciiDirective = "\tdb\t";
335 Data8bitsDirective = "\tdb\t";
336 Data16bitsDirective = "\tdw\t";
337 Data32bitsDirective = "\tdd\t";
338 Data64bitsDirective = "\tdq\t";
339 HasDotTypeDotSizeDirective = false;
340 HasSingleParameterDotFile = false;
342 TextSection = getUnnamedSection("_text", SectionFlags::Code);
343 DataSection = getUnnamedSection("_data", SectionFlags::Writeable);
345 JumpTableDataSection = NULL;
346 SwitchToSectionDirective = "";
347 TextSectionStartSuffix = "\tsegment 'CODE'";
348 DataSectionStartSuffix = "\tsegment 'DATA'";
349 SectionEndDirectiveSuffix = "\tends\n";
352 template <class BaseTAI>
353 bool X86TargetAsmInfo<BaseTAI>::LowerToBSwap(CallInst *CI) const {
354 // FIXME: this should verify that we are targetting a 486 or better. If not,
355 // we will turn this bswap into something that will be lowered to logical ops
356 // instead of emitting the bswap asm. For now, we don't support 486 or lower
357 // so don't worry about this.
359 // Verify this is a simple bswap.
360 if (CI->getNumOperands() != 2 ||
361 CI->getType() != CI->getOperand(1)->getType() ||
362 !CI->getType()->isInteger())
365 const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
366 if (!Ty || Ty->getBitWidth() % 16 != 0)
369 // Okay, we can do this xform, do so now.
370 const Type *Tys[] = { Ty };
371 Module *M = CI->getParent()->getParent()->getParent();
372 Constant *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Tys, 1);
374 Value *Op = CI->getOperand(1);
375 Op = CallInst::Create(Int, Op, CI->getName(), CI);
377 CI->replaceAllUsesWith(Op);
378 CI->eraseFromParent();
382 template <class BaseTAI>
383 bool X86TargetAsmInfo<BaseTAI>::ExpandInlineAsm(CallInst *CI) const {
384 InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
385 std::vector<InlineAsm::ConstraintInfo> Constraints = IA->ParseConstraints();
387 std::string AsmStr = IA->getAsmString();
389 // TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
390 std::vector<std::string> AsmPieces;
391 SplitString(AsmStr, AsmPieces, "\n"); // ; as separator?
393 switch (AsmPieces.size()) {
394 default: return false;
396 AsmStr = AsmPieces[0];
398 SplitString(AsmStr, AsmPieces, " \t"); // Split with whitespace.
401 if (AsmPieces.size() == 2 &&
402 AsmPieces[0] == "bswap" && AsmPieces[1] == "$0") {
403 // No need to check constraints, nothing other than the equivalent of
404 // "=r,0" would be valid here.
405 return LowerToBSwap(CI);
409 if (CI->getType() == Type::Int64Ty && Constraints.size() >= 2 &&
410 Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
411 Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
412 // bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
413 std::vector<std::string> Words;
414 SplitString(AsmPieces[0], Words, " \t");
415 if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%eax") {
417 SplitString(AsmPieces[1], Words, " \t");
418 if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%edx") {
420 SplitString(AsmPieces[2], Words, " \t,");
421 if (Words.size() == 3 && Words[0] == "xchgl" && Words[1] == "%eax" &&
422 Words[2] == "%edx") {
423 return LowerToBSwap(CI);
433 // Instantiate default implementation.
434 TEMPLATE_INSTANTIATION(class X86TargetAsmInfo<TargetAsmInfo>);