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 NonLocalEHFrameLabel = true;
74 if (TM.getRelocationModel() == Reloc::Static) {
75 StaticCtorsSection = ".constructor";
76 StaticDtorsSection = ".destructor";
78 StaticCtorsSection = ".mod_init_func";
79 StaticDtorsSection = ".mod_term_func";
82 PersonalityPrefix = "";
83 PersonalitySuffix = "+4@GOTPCREL";
85 PersonalityPrefix = "L";
86 PersonalitySuffix = "$non_lazy_ptr";
88 NeedsIndirectEncoding = true;
89 AllowQuotesInName = true;
90 InlineAsmStart = "## InlineAsm Start";
91 InlineAsmEnd = "## InlineAsm End";
93 SetDirective = "\t.set";
95 UsedDirective = "\t.no_dead_strip\t";
96 WeakDefDirective = "\t.weak_definition ";
97 WeakRefDirective = "\t.weak_reference ";
98 HiddenDirective = "\t.private_extern ";
99 ProtectedDirective = "\t.globl\t";
101 // In non-PIC modes, emit a special label before jump tables so that the
102 // linker can perform more accurate dead code stripping.
103 // Emit a local label that is preserved until the linker runs.
104 // We do not check the relocation model here since it can be overridden
106 JumpTableSpecialLabelPrefix = "l";
108 SupportsDebugInformation = true;
110 DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
111 DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
112 DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
113 DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
114 DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
115 DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
116 DwarfDebugInlineSection = ".section __DWARF,__debug_inlined,regular,debug";
117 DwarfUsesInlineInfoSection = true;
118 DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
119 DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
120 DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
121 DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
122 DwarfMacroInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
124 // Exceptions handling
125 SupportsExceptionHandling = true;
126 GlobalEHDirective = "\t.globl\t";
127 SupportsWeakOmittedEHFrame = false;
128 AbsoluteEHSectionOffsets = false;
129 DwarfEHFrameSection =
130 ".section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support";
131 DwarfExceptionSection = ".section __DATA,__gcc_except_tab";
135 X86DarwinTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
137 if (Reason == DwarfEncoding::Functions && Global)
138 return (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4);
139 else if (Reason == DwarfEncoding::CodeLabels || !Global)
140 return DW_EH_PE_pcrel;
142 return DW_EH_PE_absptr;
146 X86DarwinTargetAsmInfo::getEHGlobalPrefix() const
148 const X86Subtarget* Subtarget = &TM.getSubtarget<X86Subtarget>();
149 if (Subtarget->getDarwinVers() > 9)
150 return PrivateGlobalPrefix;
155 X86ELFTargetAsmInfo::X86ELFTargetAsmInfo(const X86TargetMachine &TM):
156 X86TargetAsmInfo<ELFTargetAsmInfo>(TM) {
158 CStringSection = ".rodata.str";
159 PrivateGlobalPrefix = ".L";
160 WeakRefDirective = "\t.weak\t";
161 SetDirective = "\t.set\t";
164 // Set up DWARF directives
165 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
168 AbsoluteDebugSectionOffsets = true;
169 SupportsDebugInformation = true;
170 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
171 DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
172 DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
173 DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
174 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
175 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
176 DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
177 DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
178 DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
179 DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
180 DwarfMacroInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
182 // Exceptions handling
183 SupportsExceptionHandling = true;
184 AbsoluteEHSectionOffsets = false;
185 DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
186 DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@progbits";
188 // On Linux we must declare when we can use a non-executable stack.
189 if (TM.getSubtarget<X86Subtarget>().isLinux())
190 NonexecutableStackDirective = "\t.section\t.note.GNU-stack,\"\",@progbits";
194 X86ELFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
196 CodeModel::Model CM = TM.getCodeModel();
197 bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
199 if (TM.getRelocationModel() == Reloc::PIC_) {
203 // 32 bit targets always encode pointers as 4 bytes
204 Format = DW_EH_PE_sdata4;
206 // 64 bit targets encode pointers in 4 bytes iff:
207 // - code model is small OR
208 // - code model is medium and we're emitting externally visible symbols
209 // or any code symbols
210 if (CM == CodeModel::Small ||
211 (CM == CodeModel::Medium && (Global ||
212 Reason != DwarfEncoding::Data)))
213 Format = DW_EH_PE_sdata4;
215 Format = DW_EH_PE_sdata8;
219 Format |= DW_EH_PE_indirect;
221 return (Format | DW_EH_PE_pcrel);
224 (CM == CodeModel::Small ||
225 (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
226 return DW_EH_PE_udata4;
228 return DW_EH_PE_absptr;
232 X86COFFTargetAsmInfo::X86COFFTargetAsmInfo(const X86TargetMachine &TM):
233 X86GenericTargetAsmInfo(TM) {
236 LCOMMDirective = "\t.lcomm\t";
237 COMMDirectiveTakesAlignment = false;
238 HasDotTypeDotSizeDirective = false;
239 HasSingleParameterDotFile = false;
240 StaticCtorsSection = "\t.section .ctors,\"aw\"";
241 StaticDtorsSection = "\t.section .dtors,\"aw\"";
242 HiddenDirective = NULL;
243 PrivateGlobalPrefix = "L"; // Prefix for private global symbols
244 WeakRefDirective = "\t.weak\t";
245 SetDirective = "\t.set\t";
247 // Set up DWARF directives
248 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
249 AbsoluteDebugSectionOffsets = true;
250 AbsoluteEHSectionOffsets = false;
251 SupportsDebugInformation = true;
252 DwarfSectionOffsetDirective = "\t.secrel32\t";
253 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"dr\"";
254 DwarfInfoSection = "\t.section\t.debug_info,\"dr\"";
255 DwarfLineSection = "\t.section\t.debug_line,\"dr\"";
256 DwarfFrameSection = "\t.section\t.debug_frame,\"dr\"";
257 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"dr\"";
258 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"dr\"";
259 DwarfStrSection = "\t.section\t.debug_str,\"dr\"";
260 DwarfLocSection = "\t.section\t.debug_loc,\"dr\"";
261 DwarfARangesSection = "\t.section\t.debug_aranges,\"dr\"";
262 DwarfRangesSection = "\t.section\t.debug_ranges,\"dr\"";
263 DwarfMacroInfoSection = "\t.section\t.debug_macinfo,\"dr\"";
267 X86COFFTargetAsmInfo::PreferredEHDataFormat(DwarfEncoding::Target Reason,
269 CodeModel::Model CM = TM.getCodeModel();
270 bool is64Bit = TM.getSubtarget<X86Subtarget>().is64Bit();
272 if (TM.getRelocationModel() == Reloc::PIC_) {
276 // 32 bit targets always encode pointers as 4 bytes
277 Format = DW_EH_PE_sdata4;
279 // 64 bit targets encode pointers in 4 bytes iff:
280 // - code model is small OR
281 // - code model is medium and we're emitting externally visible symbols
282 // or any code symbols
283 if (CM == CodeModel::Small ||
284 (CM == CodeModel::Medium && (Global ||
285 Reason != DwarfEncoding::Data)))
286 Format = DW_EH_PE_sdata4;
288 Format = DW_EH_PE_sdata8;
292 Format |= DW_EH_PE_indirect;
294 return (Format | DW_EH_PE_pcrel);
297 (CM == CodeModel::Small ||
298 (CM == CodeModel::Medium && Reason != DwarfEncoding::Data)))
299 return DW_EH_PE_udata4;
301 return DW_EH_PE_absptr;
306 X86COFFTargetAsmInfo::UniqueSectionForGlobal(const GlobalValue* GV,
307 SectionKind::Kind kind) const {
309 case SectionKind::Text:
310 return ".text$linkonce" + GV->getName();
311 case SectionKind::Data:
312 case SectionKind::BSS:
313 case SectionKind::ThreadData:
314 case SectionKind::ThreadBSS:
315 return ".data$linkonce" + GV->getName();
316 case SectionKind::ROData:
317 case SectionKind::RODataMergeConst:
318 case SectionKind::RODataMergeStr:
319 return ".rdata$linkonce" + GV->getName();
321 assert(0 && "Unknown section kind");
326 std::string X86COFFTargetAsmInfo::printSectionFlags(unsigned flags) const {
327 std::string Flags = ",\"";
329 if (flags & SectionFlags::Code)
331 if (flags & SectionFlags::Writeable)
339 X86WinTargetAsmInfo::X86WinTargetAsmInfo(const X86TargetMachine &TM):
340 X86GenericTargetAsmInfo(TM) {
344 PrivateGlobalPrefix = "$";
345 AlignDirective = "\talign\t";
346 ZeroDirective = "\tdb\t";
347 ZeroDirectiveSuffix = " dup(0)";
348 AsciiDirective = "\tdb\t";
350 Data8bitsDirective = "\tdb\t";
351 Data16bitsDirective = "\tdw\t";
352 Data32bitsDirective = "\tdd\t";
353 Data64bitsDirective = "\tdq\t";
354 HasDotTypeDotSizeDirective = false;
355 HasSingleParameterDotFile = false;
357 TextSection = getUnnamedSection("_text", SectionFlags::Code);
358 DataSection = getUnnamedSection("_data", SectionFlags::Writeable);
360 JumpTableDataSection = NULL;
361 SwitchToSectionDirective = "";
362 TextSectionStartSuffix = "\tsegment 'CODE'";
363 DataSectionStartSuffix = "\tsegment 'DATA'";
364 SectionEndDirectiveSuffix = "\tends\n";
367 template <class BaseTAI>
368 bool X86TargetAsmInfo<BaseTAI>::LowerToBSwap(CallInst *CI) const {
369 // FIXME: this should verify that we are targetting a 486 or better. If not,
370 // we will turn this bswap into something that will be lowered to logical ops
371 // instead of emitting the bswap asm. For now, we don't support 486 or lower
372 // so don't worry about this.
374 // Verify this is a simple bswap.
375 if (CI->getNumOperands() != 2 ||
376 CI->getType() != CI->getOperand(1)->getType() ||
377 !CI->getType()->isInteger())
380 const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
381 if (!Ty || Ty->getBitWidth() % 16 != 0)
384 // Okay, we can do this xform, do so now.
385 const Type *Tys[] = { Ty };
386 Module *M = CI->getParent()->getParent()->getParent();
387 Constant *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Tys, 1);
389 Value *Op = CI->getOperand(1);
390 Op = CallInst::Create(Int, Op, CI->getName(), CI);
392 CI->replaceAllUsesWith(Op);
393 CI->eraseFromParent();
397 template <class BaseTAI>
398 bool X86TargetAsmInfo<BaseTAI>::ExpandInlineAsm(CallInst *CI) const {
399 InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
400 std::vector<InlineAsm::ConstraintInfo> Constraints = IA->ParseConstraints();
402 std::string AsmStr = IA->getAsmString();
404 // TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
405 std::vector<std::string> AsmPieces;
406 SplitString(AsmStr, AsmPieces, "\n"); // ; as separator?
408 switch (AsmPieces.size()) {
409 default: return false;
411 AsmStr = AsmPieces[0];
413 SplitString(AsmStr, AsmPieces, " \t"); // Split with whitespace.
416 if (AsmPieces.size() == 2 &&
417 (AsmPieces[0] == "bswap" ||
418 AsmPieces[0] == "bswapq" ||
419 AsmPieces[0] == "bswapl") &&
420 (AsmPieces[1] == "$0" ||
421 AsmPieces[1] == "${0:q}")) {
422 // No need to check constraints, nothing other than the equivalent of
423 // "=r,0" would be valid here.
424 return LowerToBSwap(CI);
426 // rorw $$8, ${0:w} --> llvm.bswap.i16
427 if (CI->getType() == Type::Int16Ty &&
428 AsmPieces.size() == 3 &&
429 AsmPieces[0] == "rorw" &&
430 AsmPieces[1] == "$$8," &&
431 AsmPieces[2] == "${0:w}" &&
432 IA->getConstraintString() == "=r,0,~{dirflag},~{fpsr},~{flags},~{cc}") {
433 return LowerToBSwap(CI);
437 if (CI->getType() == Type::Int64Ty && Constraints.size() >= 2 &&
438 Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
439 Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
440 // bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
441 std::vector<std::string> Words;
442 SplitString(AsmPieces[0], Words, " \t");
443 if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%eax") {
445 SplitString(AsmPieces[1], Words, " \t");
446 if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%edx") {
448 SplitString(AsmPieces[2], Words, " \t,");
449 if (Words.size() == 3 && Words[0] == "xchgl" && Words[1] == "%eax" &&
450 Words[2] == "%edx") {
451 return LowerToBSwap(CI);
461 // Instantiate default implementation.
462 TEMPLATE_INSTANTIATION(class X86TargetAsmInfo<TargetAsmInfo>);