DIE.cpp revision 5e25ee8a1fcf8288d00d731b0f7ab7976f33b123
1//===--- lib/CodeGen/DIE.cpp - DWARF Info Entries -------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Data structures for DWARF info entries. 11// 12//===----------------------------------------------------------------------===// 13 14#include "DIE.h" 15#include "llvm/ADT/Twine.h" 16#include "llvm/CodeGen/AsmPrinter.h" 17#include "llvm/MC/MCAsmInfo.h" 18#include "llvm/MC/MCStreamer.h" 19#include "llvm/MC/MCSymbol.h" 20#include "llvm/Target/TargetData.h" 21#include "llvm/Support/Allocator.h" 22#include "llvm/Support/Debug.h" 23#include "llvm/Support/ErrorHandling.h" 24#include "llvm/Support/Format.h" 25#include "llvm/Support/FormattedStream.h" 26using namespace llvm; 27 28//===----------------------------------------------------------------------===// 29// DIEAbbrevData Implementation 30//===----------------------------------------------------------------------===// 31 32/// Profile - Used to gather unique data for the abbreviation folding set. 33/// 34void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const { 35 ID.AddInteger(Attribute); 36 ID.AddInteger(Form); 37} 38 39//===----------------------------------------------------------------------===// 40// DIEAbbrev Implementation 41//===----------------------------------------------------------------------===// 42 43/// Profile - Used to gather unique data for the abbreviation folding set. 44/// 45void DIEAbbrev::Profile(FoldingSetNodeID &ID) const { 46 ID.AddInteger(Tag); 47 ID.AddInteger(ChildrenFlag); 48 49 // For each attribute description. 50 for (unsigned i = 0, N = Data.size(); i < N; ++i) 51 Data[i].Profile(ID); 52} 53 54/// Emit - Print the abbreviation using the specified asm printer. 55/// 56void DIEAbbrev::Emit(AsmPrinter *AP) const { 57 // Emit its Dwarf tag type. 58 // FIXME: Doing work even in non-asm-verbose runs. 59 AP->EmitULEB128(Tag, dwarf::TagString(Tag)); 60 61 // Emit whether it has children DIEs. 62 // FIXME: Doing work even in non-asm-verbose runs. 63 AP->EmitULEB128(ChildrenFlag, dwarf::ChildrenString(ChildrenFlag)); 64 65 // For each attribute description. 66 for (unsigned i = 0, N = Data.size(); i < N; ++i) { 67 const DIEAbbrevData &AttrData = Data[i]; 68 69 // Emit attribute type. 70 // FIXME: Doing work even in non-asm-verbose runs. 71 AP->EmitULEB128(AttrData.getAttribute(), 72 dwarf::AttributeString(AttrData.getAttribute())); 73 74 // Emit form type. 75 // FIXME: Doing work even in non-asm-verbose runs. 76 AP->EmitULEB128(AttrData.getForm(), 77 dwarf::FormEncodingString(AttrData.getForm())); 78 } 79 80 // Mark end of abbreviation. 81 AP->EmitULEB128(0, "EOM(1)"); 82 AP->EmitULEB128(0, "EOM(2)"); 83} 84 85#ifndef NDEBUG 86void DIEAbbrev::print(raw_ostream &O) { 87 O << "Abbreviation @" 88 << format("0x%lx", (long)(intptr_t)this) 89 << " " 90 << dwarf::TagString(Tag) 91 << " " 92 << dwarf::ChildrenString(ChildrenFlag) 93 << '\n'; 94 95 for (unsigned i = 0, N = Data.size(); i < N; ++i) { 96 O << " " 97 << dwarf::AttributeString(Data[i].getAttribute()) 98 << " " 99 << dwarf::FormEncodingString(Data[i].getForm()) 100 << '\n'; 101 } 102} 103void DIEAbbrev::dump() { print(dbgs()); } 104#endif 105 106//===----------------------------------------------------------------------===// 107// DIE Implementation 108//===----------------------------------------------------------------------===// 109 110DIE::~DIE() { 111 for (unsigned i = 0, N = Children.size(); i < N; ++i) 112 delete Children[i]; 113} 114 115#ifndef NDEBUG 116void DIE::print(raw_ostream &O, unsigned IncIndent) { 117 IndentCount += IncIndent; 118 const std::string Indent(IndentCount, ' '); 119 bool isBlock = Abbrev.getTag() == 0; 120 121 if (!isBlock) { 122 O << Indent 123 << "Die: " 124 << format("0x%lx", (long)(intptr_t)this) 125 << ", Offset: " << Offset 126 << ", Size: " << Size << "\n"; 127 128 O << Indent 129 << dwarf::TagString(Abbrev.getTag()) 130 << " " 131 << dwarf::ChildrenString(Abbrev.getChildrenFlag()) << "\n"; 132 } else { 133 O << "Size: " << Size << "\n"; 134 } 135 136 const SmallVector<DIEAbbrevData, 8> &Data = Abbrev.getData(); 137 138 IndentCount += 2; 139 for (unsigned i = 0, N = Data.size(); i < N; ++i) { 140 O << Indent; 141 142 if (!isBlock) 143 O << dwarf::AttributeString(Data[i].getAttribute()); 144 else 145 O << "Blk[" << i << "]"; 146 147 O << " " 148 << dwarf::FormEncodingString(Data[i].getForm()) 149 << " "; 150 Values[i]->print(O); 151 O << "\n"; 152 } 153 IndentCount -= 2; 154 155 for (unsigned j = 0, M = Children.size(); j < M; ++j) { 156 Children[j]->print(O, 4); 157 } 158 159 if (!isBlock) O << "\n"; 160 IndentCount -= IncIndent; 161} 162 163void DIE::dump() { 164 print(dbgs()); 165} 166#endif 167 168void DIEValue::anchor() { } 169 170#ifndef NDEBUG 171void DIEValue::dump() { 172 print(dbgs()); 173} 174#endif 175 176//===----------------------------------------------------------------------===// 177// DIEInteger Implementation 178//===----------------------------------------------------------------------===// 179 180/// EmitValue - Emit integer of appropriate size. 181/// 182void DIEInteger::EmitValue(AsmPrinter *Asm, unsigned Form) const { 183 unsigned Size = ~0U; 184 switch (Form) { 185 case dwarf::DW_FORM_flag: // Fall thru 186 case dwarf::DW_FORM_ref1: // Fall thru 187 case dwarf::DW_FORM_data1: Size = 1; break; 188 case dwarf::DW_FORM_ref2: // Fall thru 189 case dwarf::DW_FORM_data2: Size = 2; break; 190 case dwarf::DW_FORM_ref4: // Fall thru 191 case dwarf::DW_FORM_data4: Size = 4; break; 192 case dwarf::DW_FORM_ref8: // Fall thru 193 case dwarf::DW_FORM_data8: Size = 8; break; 194 case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return; 195 case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return; 196 case dwarf::DW_FORM_addr: Size = Asm->getTargetData().getPointerSize(); break; 197 default: llvm_unreachable("DIE Value form not supported yet"); 198 } 199 Asm->OutStreamer.EmitIntValue(Integer, Size, 0/*addrspace*/); 200} 201 202/// SizeOf - Determine size of integer value in bytes. 203/// 204unsigned DIEInteger::SizeOf(AsmPrinter *AP, unsigned Form) const { 205 switch (Form) { 206 case dwarf::DW_FORM_flag: // Fall thru 207 case dwarf::DW_FORM_ref1: // Fall thru 208 case dwarf::DW_FORM_data1: return sizeof(int8_t); 209 case dwarf::DW_FORM_ref2: // Fall thru 210 case dwarf::DW_FORM_data2: return sizeof(int16_t); 211 case dwarf::DW_FORM_ref4: // Fall thru 212 case dwarf::DW_FORM_data4: return sizeof(int32_t); 213 case dwarf::DW_FORM_ref8: // Fall thru 214 case dwarf::DW_FORM_data8: return sizeof(int64_t); 215 case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer); 216 case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer); 217 case dwarf::DW_FORM_addr: return AP->getTargetData().getPointerSize(); 218 default: llvm_unreachable("DIE Value form not supported yet"); 219 } 220} 221 222#ifndef NDEBUG 223void DIEInteger::print(raw_ostream &O) { 224 O << "Int: " << (int64_t)Integer << " 0x"; 225 O.write_hex(Integer); 226} 227#endif 228 229//===----------------------------------------------------------------------===// 230// DIELabel Implementation 231//===----------------------------------------------------------------------===// 232 233/// EmitValue - Emit label value. 234/// 235void DIELabel::EmitValue(AsmPrinter *AP, unsigned Form) const { 236 AP->OutStreamer.EmitSymbolValue(Label, SizeOf(AP, Form), 0/*AddrSpace*/); 237} 238 239/// SizeOf - Determine size of label value in bytes. 240/// 241unsigned DIELabel::SizeOf(AsmPrinter *AP, unsigned Form) const { 242 if (Form == dwarf::DW_FORM_data4) return 4; 243 if (Form == dwarf::DW_FORM_strp) return 4; 244 return AP->getTargetData().getPointerSize(); 245} 246 247#ifndef NDEBUG 248void DIELabel::print(raw_ostream &O) { 249 O << "Lbl: " << Label->getName(); 250} 251#endif 252 253//===----------------------------------------------------------------------===// 254// DIEDelta Implementation 255//===----------------------------------------------------------------------===// 256 257/// EmitValue - Emit delta value. 258/// 259void DIEDelta::EmitValue(AsmPrinter *AP, unsigned Form) const { 260 AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form)); 261} 262 263/// SizeOf - Determine size of delta value in bytes. 264/// 265unsigned DIEDelta::SizeOf(AsmPrinter *AP, unsigned Form) const { 266 if (Form == dwarf::DW_FORM_data4) return 4; 267 if (Form == dwarf::DW_FORM_strp) return 4; 268 return AP->getTargetData().getPointerSize(); 269} 270 271#ifndef NDEBUG 272void DIEDelta::print(raw_ostream &O) { 273 O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName(); 274} 275#endif 276 277//===----------------------------------------------------------------------===// 278// DIEEntry Implementation 279//===----------------------------------------------------------------------===// 280 281/// EmitValue - Emit debug information entry offset. 282/// 283void DIEEntry::EmitValue(AsmPrinter *AP, unsigned Form) const { 284 AP->EmitInt32(Entry->getOffset()); 285} 286 287#ifndef NDEBUG 288void DIEEntry::print(raw_ostream &O) { 289 O << format("Die: 0x%lx", (long)(intptr_t)Entry); 290} 291#endif 292 293//===----------------------------------------------------------------------===// 294// DIEBlock Implementation 295//===----------------------------------------------------------------------===// 296 297/// ComputeSize - calculate the size of the block. 298/// 299unsigned DIEBlock::ComputeSize(AsmPrinter *AP) { 300 if (!Size) { 301 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData(); 302 for (unsigned i = 0, N = Values.size(); i < N; ++i) 303 Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm()); 304 } 305 306 return Size; 307} 308 309/// EmitValue - Emit block data. 310/// 311void DIEBlock::EmitValue(AsmPrinter *Asm, unsigned Form) const { 312 switch (Form) { 313 default: llvm_unreachable("Improper form for block"); 314 case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break; 315 case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break; 316 case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break; 317 case dwarf::DW_FORM_block: Asm->EmitULEB128(Size); break; 318 } 319 320 const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev.getData(); 321 for (unsigned i = 0, N = Values.size(); i < N; ++i) 322 Values[i]->EmitValue(Asm, AbbrevData[i].getForm()); 323} 324 325/// SizeOf - Determine size of block data in bytes. 326/// 327unsigned DIEBlock::SizeOf(AsmPrinter *AP, unsigned Form) const { 328 switch (Form) { 329 case dwarf::DW_FORM_block1: return Size + sizeof(int8_t); 330 case dwarf::DW_FORM_block2: return Size + sizeof(int16_t); 331 case dwarf::DW_FORM_block4: return Size + sizeof(int32_t); 332 case dwarf::DW_FORM_block: return Size + MCAsmInfo::getULEB128Size(Size); 333 default: llvm_unreachable("Improper form for block"); 334 } 335} 336 337#ifndef NDEBUG 338void DIEBlock::print(raw_ostream &O) { 339 O << "Blk: "; 340 DIE::print(O, 5); 341} 342#endif 343