1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494
|
//===- DWARFEmitter - Convert YAML to DWARF binary data -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// The DWARF component of yaml2obj. Provided as library code for tests.
///
//===----------------------------------------------------------------------===//
#include "llvm/ObjectYAML/DWARFEmitter.h"
#include "DWARFVisitor.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ObjectYAML/DWARFYAML.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SwapByteOrder.h"
#include "llvm/Support/YAMLTraits.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <string>
#include <vector>
using namespace llvm;
template <typename T>
static void writeInteger(T Integer, raw_ostream &OS, bool IsLittleEndian) {
if (IsLittleEndian != sys::IsLittleEndianHost)
sys::swapByteOrder(Integer);
OS.write(reinterpret_cast<char *>(&Integer), sizeof(T));
}
static void writeVariableSizedInteger(uint64_t Integer, size_t Size,
raw_ostream &OS, bool IsLittleEndian) {
if (8 == Size)
writeInteger((uint64_t)Integer, OS, IsLittleEndian);
else if (4 == Size)
writeInteger((uint32_t)Integer, OS, IsLittleEndian);
else if (2 == Size)
writeInteger((uint16_t)Integer, OS, IsLittleEndian);
else if (1 == Size)
writeInteger((uint8_t)Integer, OS, IsLittleEndian);
else
assert(false && "Invalid integer write size.");
}
static void ZeroFillBytes(raw_ostream &OS, size_t Size) {
std::vector<uint8_t> FillData;
FillData.insert(FillData.begin(), Size, 0);
OS.write(reinterpret_cast<char *>(FillData.data()), Size);
}
static void writeInitialLength(const DWARFYAML::InitialLength &Length,
raw_ostream &OS, bool IsLittleEndian) {
writeInteger((uint32_t)Length.TotalLength, OS, IsLittleEndian);
if (Length.isDWARF64())
writeInteger((uint64_t)Length.TotalLength64, OS, IsLittleEndian);
}
void DWARFYAML::EmitDebugStr(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto Str : DI.DebugStrings) {
OS.write(Str.data(), Str.size());
OS.write('\0');
}
}
void DWARFYAML::EmitDebugAbbrev(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto AbbrevDecl : DI.AbbrevDecls) {
encodeULEB128(AbbrevDecl.Code, OS);
// XXX BINARYEN This is a terminator.
if (!AbbrevDecl.Code) {
continue;
}
encodeULEB128(AbbrevDecl.Tag, OS);
OS.write(AbbrevDecl.Children);
for (auto Attr : AbbrevDecl.Attributes) {
encodeULEB128(Attr.Attribute, OS);
encodeULEB128(Attr.Form, OS);
if (Attr.Form == dwarf::DW_FORM_implicit_const)
encodeSLEB128(Attr.Value, OS);
}
encodeULEB128(0, OS);
encodeULEB128(0, OS);
}
}
void DWARFYAML::EmitDebugAranges(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto Range : DI.ARanges) {
auto HeaderStart = OS.tell();
writeInitialLength(Range.Length, OS, DI.IsLittleEndian);
writeInteger((uint16_t)Range.Version, OS, DI.IsLittleEndian);
writeInteger((uint32_t)Range.CuOffset, OS, DI.IsLittleEndian);
writeInteger((uint8_t)Range.AddrSize, OS, DI.IsLittleEndian);
writeInteger((uint8_t)Range.SegSize, OS, DI.IsLittleEndian);
auto HeaderSize = OS.tell() - HeaderStart;
auto FirstDescriptor = alignTo(HeaderSize, Range.AddrSize * 2);
ZeroFillBytes(OS, FirstDescriptor - HeaderSize);
for (auto Descriptor : Range.Descriptors) {
writeVariableSizedInteger(Descriptor.Address, Range.AddrSize, OS,
DI.IsLittleEndian);
writeVariableSizedInteger(Descriptor.Length, Range.AddrSize, OS,
DI.IsLittleEndian);
}
ZeroFillBytes(OS, Range.AddrSize * 2);
}
}
// XXX BINARYEN
void DWARFYAML::EmitDebugRanges(raw_ostream &OS, const DWARFYAML::Data &DI) {
// As DwarfStreamer.cpp says, "The debug_range section
// format is totally trivial, consisting just of pairs of address
// sized addresses describing the ranges." and apparently it ends
// with a null termination of a pair of zeros
for (auto Range : DI.Ranges) {
writeInteger((uint32_t)Range.Start, OS, DI.IsLittleEndian);
writeInteger((uint32_t)Range.End, OS, DI.IsLittleEndian);
}
}
// XXX BINARYEN
void DWARFYAML::EmitDebugLoc(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto Loc : DI.Locs) {
auto AddrSize = DI.CompileUnits[0].AddrSize; // XXX BINARYEN
// FIXME: Loc.Start etc should probably not be 32-bit.
writeVariableSizedInteger((uint64_t)(int32_t)Loc.Start, AddrSize, OS, DI.IsLittleEndian);
writeVariableSizedInteger((uint64_t)(int32_t)Loc.End, AddrSize, OS, DI.IsLittleEndian);
if (Loc.Start == 0 && Loc.End == 0) {
// End of a list.
continue;
}
if (Loc.Start != -1) {
writeInteger((uint16_t)Loc.Location.size(), OS, DI.IsLittleEndian);
for (auto x : Loc.Location) {
writeInteger((uint8_t)x, OS, DI.IsLittleEndian);
}
}
}
}
void DWARFYAML::EmitPubSection(raw_ostream &OS,
const DWARFYAML::PubSection &Sect,
bool IsLittleEndian) {
writeInitialLength(Sect.Length, OS, IsLittleEndian);
writeInteger((uint16_t)Sect.Version, OS, IsLittleEndian);
writeInteger((uint32_t)Sect.UnitOffset, OS, IsLittleEndian);
writeInteger((uint32_t)Sect.UnitSize, OS, IsLittleEndian);
for (auto Entry : Sect.Entries) {
writeInteger((uint32_t)Entry.DieOffset, OS, IsLittleEndian);
if (Sect.IsGNUStyle)
writeInteger((uint32_t)Entry.Descriptor, OS, IsLittleEndian);
OS.write(Entry.Name.data(), Entry.Name.size());
OS.write('\0');
}
}
namespace {
/// An extension of the DWARFYAML::ConstVisitor which writes compile
/// units and DIEs to a stream.
class DumpVisitor : public DWARFYAML::ConstVisitor {
raw_ostream &OS;
size_t StartPos; // XXX BINARYEN
protected:
void onStartCompileUnit(const DWARFYAML::Unit &CU) override {
writeInitialLength(CU.Length, OS, DebugInfo.IsLittleEndian);
StartPos = OS.tell(); // XXX BINARYEN
writeInteger((uint16_t)CU.Version, OS, DebugInfo.IsLittleEndian);
if(CU.Version >= 5) {
writeInteger((uint8_t)CU.Type, OS, DebugInfo.IsLittleEndian);
writeInteger((uint8_t)CU.AddrSize, OS, DebugInfo.IsLittleEndian);
writeInteger((uint32_t)CU.AbbrOffset, OS, DebugInfo.IsLittleEndian);
}else {
writeInteger((uint32_t)CU.AbbrOffset, OS, DebugInfo.IsLittleEndian);
writeInteger((uint8_t)CU.AddrSize, OS, DebugInfo.IsLittleEndian);
}
}
// XXX BINARYEN Make sure we emit the right size. We should not change the
// size as we only modify relocatable fields like addresses, and such fields
// have a fixed size, so any change is a bug.
// We make an exception for AddrSizeChanged, which happens when we have run
// the Memory64Lowering pass to turn wasm64 into wasm32.
void onEndCompileUnit(const DWARFYAML::Unit &CU) {
size_t EndPos = OS.tell();
if (EndPos - StartPos != CU.Length.getLength() && !CU.AddrSizeChanged) {
llvm_unreachable("compile unit size was incorrect");
}
}
void onStartDIE(const DWARFYAML::Unit &CU,
const DWARFYAML::Entry &DIE) override {
encodeULEB128(DIE.AbbrCode, OS);
}
void onValue(const uint8_t U) override {
writeInteger(U, OS, DebugInfo.IsLittleEndian);
}
void onValue(const uint16_t U) override {
writeInteger(U, OS, DebugInfo.IsLittleEndian);
}
void onValue(const uint32_t U) override {
writeInteger(U, OS, DebugInfo.IsLittleEndian);
}
void onValue(const uint64_t U, const bool LEB = false) override {
if (LEB)
encodeULEB128(U, OS);
else
writeInteger(U, OS, DebugInfo.IsLittleEndian);
}
void onValue(const int64_t S, const bool LEB = false) override {
if (LEB)
encodeSLEB128(S, OS);
else
writeInteger(S, OS, DebugInfo.IsLittleEndian);
}
void onValue(const StringRef String) override {
OS.write(String.data(), String.size());
OS.write('\0');
}
void onValue(const MemoryBufferRef MBR) override {
OS.write(MBR.getBufferStart(), MBR.getBufferSize());
}
public:
DumpVisitor(const DWARFYAML::Data &DI, raw_ostream &Out)
: DWARFYAML::ConstVisitor(DI), OS(Out) {}
};
} // namespace
void DWARFYAML::EmitDebugInfo(raw_ostream &OS, const DWARFYAML::Data &DI) {
DumpVisitor Visitor(DI, OS);
Visitor.traverseDebugInfo();
}
static void EmitFileEntry(raw_ostream &OS, const DWARFYAML::File &File) {
OS.write(File.Name.data(), File.Name.size());
OS.write('\0');
encodeULEB128(File.DirIdx, OS);
encodeULEB128(File.ModTime, OS);
encodeULEB128(File.Length, OS);
}
// XXX BINARYEN: Refactor to an *Internal method that allows us to optionally
// compute the new lengths.
static void EmitDebugLineInternal(raw_ostream &RealOS,
const DWARFYAML::Data &DI,
std::vector<size_t>* computedLengths) {
for (auto &LineTable : DI.DebugLines) {
// XXX BINARYEN We need to update each line table's length. Write to a
// temp stream first, then get the size from that.
std::string Buffer;
raw_string_ostream OS(Buffer);
// XXX BINARYEN writeInitialLength(LineTable.Length, OS, DI.IsLittleEndian);
uint64_t SizeOfPrologueLength = LineTable.Length.isDWARF64() ? 8 : 4;
writeInteger((uint16_t)LineTable.Version, OS, DI.IsLittleEndian);
writeVariableSizedInteger(LineTable.PrologueLength, SizeOfPrologueLength,
OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.MinInstLength, OS, DI.IsLittleEndian);
if (LineTable.Version >= 4)
writeInteger((uint8_t)LineTable.MaxOpsPerInst, OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.DefaultIsStmt, OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.LineBase, OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.LineRange, OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.OpcodeBase, OS, DI.IsLittleEndian);
for (auto OpcodeLength : LineTable.StandardOpcodeLengths)
writeInteger((uint8_t)OpcodeLength, OS, DI.IsLittleEndian);
for (auto IncludeDir : LineTable.IncludeDirs) {
OS.write(IncludeDir.data(), IncludeDir.size());
OS.write('\0');
}
OS.write('\0');
for (auto File : LineTable.Files)
EmitFileEntry(OS, File);
OS.write('\0');
for (auto Op : LineTable.Opcodes) {
writeInteger((uint8_t)Op.Opcode, OS, DI.IsLittleEndian);
if (Op.Opcode == 0) {
encodeULEB128(Op.ExtLen, OS);
writeInteger((uint8_t)Op.SubOpcode, OS, DI.IsLittleEndian);
switch (Op.SubOpcode) {
case dwarf::DW_LNE_set_address:
case dwarf::DW_LNE_set_discriminator:
writeVariableSizedInteger(Op.Data, DI.CompileUnits[0].AddrSize, OS,
DI.IsLittleEndian);
break;
case dwarf::DW_LNE_define_file:
EmitFileEntry(OS, Op.FileEntry);
break;
case dwarf::DW_LNE_end_sequence:
break;
default:
for (auto OpByte : Op.UnknownOpcodeData)
writeInteger((uint8_t)OpByte, OS, DI.IsLittleEndian);
}
} else if (Op.Opcode < LineTable.OpcodeBase) {
switch (Op.Opcode) {
case dwarf::DW_LNS_copy:
case dwarf::DW_LNS_negate_stmt:
case dwarf::DW_LNS_set_basic_block:
case dwarf::DW_LNS_const_add_pc:
case dwarf::DW_LNS_set_prologue_end:
case dwarf::DW_LNS_set_epilogue_begin:
break;
case dwarf::DW_LNS_advance_pc:
case dwarf::DW_LNS_set_file:
case dwarf::DW_LNS_set_column:
case dwarf::DW_LNS_set_isa:
encodeULEB128(Op.Data, OS);
break;
case dwarf::DW_LNS_advance_line:
encodeSLEB128(Op.SData, OS);
break;
case dwarf::DW_LNS_fixed_advance_pc:
writeInteger((uint16_t)Op.Data, OS, DI.IsLittleEndian);
break;
default:
for (auto OpData : Op.StandardOpcodeData) {
encodeULEB128(OpData, OS);
}
}
}
}
// XXX BINARYEN Write to the actual stream, with the proper size.
// We assume for now that the length fits in 32 bits.
size_t Size = OS.str().size();
if (Size >= UINT32_MAX) {
llvm_unreachable("Table is too big");
}
if (computedLengths) {
computedLengths->push_back(Size);
}
writeInteger((uint32_t)Size, RealOS, DI.IsLittleEndian);
RealOS << OS.str();
}
}
void DWARFYAML::EmitDebugLine(raw_ostream &RealOS, const DWARFYAML::Data &DI) {
EmitDebugLineInternal(RealOS, DI, nullptr);
}
void DWARFYAML::ComputeDebugLine(Data &DI,
std::vector<size_t>& computedLengths) {
// TODO: Avoid writing out the data, or at least cache it so we don't need to
// do it again later.
std::string buffer;
llvm::raw_string_ostream tempStream(buffer);
EmitDebugLineInternal(tempStream, DI, &computedLengths);
}
using EmitFuncType = void (*)(raw_ostream &, const DWARFYAML::Data &);
static void
EmitDebugSectionImpl(const DWARFYAML::Data &DI, EmitFuncType EmitFunc,
StringRef Sec,
StringMap<std::unique_ptr<MemoryBuffer>> &OutputBuffers) {
std::string Data;
raw_string_ostream DebugInfoStream(Data);
EmitFunc(DebugInfoStream, DI);
DebugInfoStream.flush();
if (!Data.empty())
OutputBuffers[Sec] = MemoryBuffer::getMemBufferCopy(Data);
}
namespace {
class DIEFixupVisitor : public DWARFYAML::Visitor {
uint64_t Length;
public:
DIEFixupVisitor(DWARFYAML::Data &DI) : DWARFYAML::Visitor(DI){};
private:
virtual void onStartCompileUnit(DWARFYAML::Unit &CU) { Length = 7; }
virtual void onEndCompileUnit(DWARFYAML::Unit &CU) {
CU.Length.setLength(Length);
}
virtual void onStartDIE(DWARFYAML::Unit &CU, DWARFYAML::Entry &DIE) {
Length += getULEB128Size(DIE.AbbrCode);
}
virtual void onValue(const uint8_t U) { Length += 1; }
virtual void onValue(const uint16_t U) { Length += 2; }
virtual void onValue(const uint32_t U) { Length += 4; }
virtual void onValue(const uint64_t U, const bool LEB = false) {
if (LEB)
Length += getULEB128Size(U);
else
Length += 8;
}
virtual void onValue(const int64_t S, const bool LEB = false) {
if (LEB)
Length += getSLEB128Size(S);
else
Length += 8;
}
virtual void onValue(const StringRef String) { Length += String.size() + 1; }
virtual void onValue(const MemoryBufferRef MBR) {
Length += MBR.getBufferSize();
}
};
} // namespace
Expected<StringMap<std::unique_ptr<MemoryBuffer>>>
DWARFYAML::EmitDebugSections(StringRef YAMLString, bool ApplyFixups,
bool IsLittleEndian) {
yaml::Input YIn(YAMLString);
DWARFYAML::Data DI;
DI.IsLittleEndian = IsLittleEndian;
YIn >> DI;
if (YIn.error())
return errorCodeToError(YIn.error());
if (ApplyFixups) {
DIEFixupVisitor DIFixer(DI);
DIFixer.traverseDebugInfo();
}
StringMap<std::unique_ptr<MemoryBuffer>> DebugSections;
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugInfo, "debug_info",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugLine, "debug_line",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugStr, "debug_str",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAbbrev, "debug_abbrev",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAranges, "debug_aranges",
DebugSections);
return std::move(DebugSections);
}
// XXX BINARYEN <--
namespace llvm {
namespace DWARFYAML {
StringMap<std::unique_ptr<MemoryBuffer>>
EmitDebugSections(llvm::DWARFYAML::Data &DI, bool ApplyFixups) {
if (ApplyFixups) {
DIEFixupVisitor DIFixer(DI);
DIFixer.traverseDebugInfo();
}
StringMap<std::unique_ptr<MemoryBuffer>> DebugSections;
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugInfo, "debug_info",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugLine, "debug_line",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugStr, "debug_str",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAbbrev, "debug_abbrev",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAranges, "debug_aranges",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugRanges, "debug_ranges",
DebugSections); // XXX BINARYEN
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugLoc, "debug_loc",
DebugSections); // XXX BINARYEN
return std::move(DebugSections);
}
} // namespace DWARFYAML
} // namespace llvm
// XXX BINARYEN -->
|