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"
25 static const char* x86_asm_table[] = {"{si}", "S",
36 X86TargetAsmInfo::X86TargetAsmInfo(const X86TargetMachine &TM) {
37 const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
39 // FIXME - Should be simplified.
41 AsmTransCBE = x86_asm_table;
43 switch (Subtarget->TargetType) {
44 case X86Subtarget::isDarwin:
45 AlignmentIsInBytes = false;
47 if (!Subtarget->is64Bit())
48 Data64bitsDirective = 0; // we can't emit a 64-bit unit
49 ZeroDirective = "\t.space\t"; // ".space N" emits N zeros.
50 PrivateGlobalPrefix = "L"; // Marker for constant pool idxs
51 BSSSection = 0; // no BSS section.
52 ZeroFillDirective = "\t.zerofill\t"; // Uses .zerofill
53 ConstantPoolSection = "\t.const\n";
54 JumpTableDataSection = "\t.const\n";
55 CStringSection = "\t.cstring";
56 FourByteConstantSection = "\t.literal4\n";
57 EightByteConstantSection = "\t.literal8\n";
58 if (Subtarget->is64Bit())
59 SixteenByteConstantSection = "\t.literal16\n";
60 ReadOnlySection = "\t.const\n";
61 LCOMMDirective = "\t.lcomm\t";
62 COMMDirectiveTakesAlignment = false;
63 HasDotTypeDotSizeDirective = false;
64 if (TM.getRelocationModel() == Reloc::Static) {
65 StaticCtorsSection = ".constructor";
66 StaticDtorsSection = ".destructor";
68 StaticCtorsSection = ".mod_init_func";
69 StaticDtorsSection = ".mod_term_func";
71 PersonalityPrefix = "L";
72 PersonalitySuffix = "$non_lazy_ptr";
73 NeedsIndirectEncoding = true;
74 InlineAsmStart = "# InlineAsm Start";
75 InlineAsmEnd = "# InlineAsm End";
76 SetDirective = "\t.set";
78 UsedDirective = "\t.no_dead_strip\t";
79 WeakDefDirective = "\t.weak_definition\t";
80 WeakRefDirective = "\t.weak_reference\t";
81 HiddenDirective = "\t.private_extern\t";
83 // In non-PIC modes, emit a special label before jump tables so that the
84 // linker can perform more accurate dead code stripping.
85 if (TM.getRelocationModel() != Reloc::PIC_) {
86 // Emit a local label that is preserved until the linker runs.
87 JumpTableSpecialLabelPrefix = "l";
90 SupportsDebugInformation = true;
92 DwarfAbbrevSection = ".section __DWARF,__debug_abbrev,regular,debug";
93 DwarfInfoSection = ".section __DWARF,__debug_info,regular,debug";
94 DwarfLineSection = ".section __DWARF,__debug_line,regular,debug";
95 DwarfFrameSection = ".section __DWARF,__debug_frame,regular,debug";
96 GlobalEHDirective = "\t.globl\t";
97 DwarfPubNamesSection = ".section __DWARF,__debug_pubnames,regular,debug";
98 DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes,regular,debug";
99 DwarfStrSection = ".section __DWARF,__debug_str,regular,debug";
100 DwarfLocSection = ".section __DWARF,__debug_loc,regular,debug";
101 DwarfARangesSection = ".section __DWARF,__debug_aranges,regular,debug";
102 DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
103 DwarfMacInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
105 // Exceptions handling
106 if (!Subtarget->is64Bit())
107 SupportsExceptionHandling = true;
108 AbsoluteEHSectionOffsets = false;
109 DwarfEHFrameSection =
110 ".section __TEXT,__eh_frame,coalesced,no_toc+strip_static_syms+live_support";
111 DwarfExceptionSection = ".section __DATA,__gcc_except_tab";
114 case X86Subtarget::isELF:
115 ReadOnlySection = "\t.section\t.rodata";
116 FourByteConstantSection = "\t.section\t.rodata.cst4,\"aM\",@progbits,4";
117 EightByteConstantSection = "\t.section\t.rodata.cst8,\"aM\",@progbits,8";
118 SixteenByteConstantSection = "\t.section\t.rodata.cst16,\"aM\",@progbits,16";
119 CStringSection = "\t.section\t.rodata.str1.1,\"aMS\",@progbits,1";
120 PrivateGlobalPrefix = ".L";
121 WeakRefDirective = "\t.weak\t";
122 SetDirective = "\t.set\t";
125 // Set up DWARF directives
126 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
129 AbsoluteDebugSectionOffsets = true;
130 SupportsDebugInformation = true;
131 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"\",@progbits";
132 DwarfInfoSection = "\t.section\t.debug_info,\"\",@progbits";
133 DwarfLineSection = "\t.section\t.debug_line,\"\",@progbits";
134 DwarfFrameSection = "\t.section\t.debug_frame,\"\",@progbits";
135 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
136 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
137 DwarfStrSection = "\t.section\t.debug_str,\"\",@progbits";
138 DwarfLocSection = "\t.section\t.debug_loc,\"\",@progbits";
139 DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
140 DwarfRangesSection = "\t.section\t.debug_ranges,\"\",@progbits";
141 DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
143 // Exceptions handling
144 if (!Subtarget->is64Bit())
145 SupportsExceptionHandling = true;
146 AbsoluteEHSectionOffsets = false;
147 DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
148 DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@progbits";
151 case X86Subtarget::isCygwin:
152 case X86Subtarget::isMingw:
154 LCOMMDirective = "\t.lcomm\t";
155 COMMDirectiveTakesAlignment = false;
156 HasDotTypeDotSizeDirective = false;
157 StaticCtorsSection = "\t.section .ctors,\"aw\"";
158 StaticDtorsSection = "\t.section .dtors,\"aw\"";
159 HiddenDirective = NULL;
160 PrivateGlobalPrefix = "L"; // Prefix for private global symbols
161 WeakRefDirective = "\t.weak\t";
162 SetDirective = "\t.set\t";
164 // Set up DWARF directives
165 HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
166 AbsoluteDebugSectionOffsets = true;
167 AbsoluteEHSectionOffsets = false;
168 SupportsDebugInformation = true;
169 DwarfSectionOffsetDirective = "\t.secrel32\t";
170 DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"dr\"";
171 DwarfInfoSection = "\t.section\t.debug_info,\"dr\"";
172 DwarfLineSection = "\t.section\t.debug_line,\"dr\"";
173 DwarfFrameSection = "\t.section\t.debug_frame,\"dr\"";
174 DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"dr\"";
175 DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"dr\"";
176 DwarfStrSection = "\t.section\t.debug_str,\"dr\"";
177 DwarfLocSection = "\t.section\t.debug_loc,\"dr\"";
178 DwarfARangesSection = "\t.section\t.debug_aranges,\"dr\"";
179 DwarfRangesSection = "\t.section\t.debug_ranges,\"dr\"";
180 DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"dr\"";
183 case X86Subtarget::isWindows:
185 HasDotTypeDotSizeDirective = false;
191 if (Subtarget->isFlavorIntel()) {
195 PrivateGlobalPrefix = "$";
196 AlignDirective = "\talign\t";
197 ZeroDirective = "\tdb\t";
198 ZeroDirectiveSuffix = " dup(0)";
199 AsciiDirective = "\tdb\t";
201 Data8bitsDirective = "\tdb\t";
202 Data16bitsDirective = "\tdw\t";
203 Data32bitsDirective = "\tdd\t";
204 Data64bitsDirective = "\tdq\t";
205 HasDotTypeDotSizeDirective = false;
207 TextSection = "_text";
208 DataSection = "_data";
209 JumpTableDataSection = NULL;
210 SwitchToSectionDirective = "";
211 TextSectionStartSuffix = "\tsegment 'CODE'";
212 DataSectionStartSuffix = "\tsegment 'DATA'";
213 SectionEndDirectiveSuffix = "\tends\n";
216 AssemblerDialect = Subtarget->getAsmFlavor();
219 bool X86TargetAsmInfo::LowerToBSwap(CallInst *CI) const {
220 // FIXME: this should verify that we are targetting a 486 or better. If not,
221 // we will turn this bswap into something that will be lowered to logical ops
222 // instead of emitting the bswap asm. For now, we don't support 486 or lower
223 // so don't worry about this.
225 // Verify this is a simple bswap.
226 if (CI->getNumOperands() != 2 ||
227 CI->getType() != CI->getOperand(1)->getType() ||
228 !CI->getType()->isInteger())
231 const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
232 if (!Ty || Ty->getBitWidth() % 16 != 0)
235 // Okay, we can do this xform, do so now.
236 const Type *Tys[] = { Ty };
237 Module *M = CI->getParent()->getParent()->getParent();
238 Constant *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Tys, 1);
240 Value *Op = CI->getOperand(1);
241 Op = new CallInst(Int, Op, CI->getName(), CI);
243 CI->replaceAllUsesWith(Op);
244 CI->eraseFromParent();
249 bool X86TargetAsmInfo::ExpandInlineAsm(CallInst *CI) const {
250 InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
251 std::vector<InlineAsm::ConstraintInfo> Constraints = IA->ParseConstraints();
253 std::string AsmStr = IA->getAsmString();
255 // TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
256 std::vector<std::string> AsmPieces;
257 SplitString(AsmStr, AsmPieces, "\n"); // ; as separator?
259 switch (AsmPieces.size()) {
260 default: return false;
262 AsmStr = AsmPieces[0];
264 SplitString(AsmStr, AsmPieces, " \t"); // Split with whitespace.
267 if (AsmPieces.size() == 2 &&
268 AsmPieces[0] == "bswap" && AsmPieces[1] == "$0") {
269 // No need to check constraints, nothing other than the equivalent of
270 // "=r,0" would be valid here.
271 return LowerToBSwap(CI);
275 if (CI->getType() == Type::Int64Ty && Constraints.size() >= 2 &&
276 Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
277 Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
278 // bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
279 std::vector<std::string> Words;
280 SplitString(AsmPieces[0], Words, " \t");
281 if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%eax") {
283 SplitString(AsmPieces[1], Words, " \t");
284 if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%edx") {
286 SplitString(AsmPieces[2], Words, " \t,");
287 if (Words.size() == 3 && Words[0] == "xchgl" && Words[1] == "%eax" &&
288 Words[2] == "%edx") {
289 return LowerToBSwap(CI);