1 | //===- WasmObjectFile.cpp - Wasm object file implementation ---------------===// |
---|---|
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | |
9 | #include "llvm/ADT/ArrayRef.h" |
10 | #include "llvm/ADT/DenseSet.h" |
11 | #include "llvm/ADT/SmallSet.h" |
12 | #include "llvm/ADT/StringRef.h" |
13 | #include "llvm/ADT/StringSet.h" |
14 | #include "llvm/ADT/StringSwitch.h" |
15 | #include "llvm/BinaryFormat/Wasm.h" |
16 | #include "llvm/Object/Binary.h" |
17 | #include "llvm/Object/Error.h" |
18 | #include "llvm/Object/ObjectFile.h" |
19 | #include "llvm/Object/SymbolicFile.h" |
20 | #include "llvm/Object/Wasm.h" |
21 | #include "llvm/Support/Endian.h" |
22 | #include "llvm/Support/Error.h" |
23 | #include "llvm/Support/ErrorHandling.h" |
24 | #include "llvm/Support/LEB128.h" |
25 | #include "llvm/Support/ScopedPrinter.h" |
26 | #include "llvm/TargetParser/SubtargetFeature.h" |
27 | #include "llvm/TargetParser/Triple.h" |
28 | #include <cassert> |
29 | #include <cstdint> |
30 | #include <cstring> |
31 | |
32 | #define DEBUG_TYPE "wasm-object" |
33 | |
34 | using namespace llvm; |
35 | using namespace object; |
36 | |
37 | void WasmSymbol::print(raw_ostream &Out) const { |
38 | Out << "Name="<< Info.Name |
39 | << ", Kind="<< toString(type: wasm::WasmSymbolType(Info.Kind)) << ", Flags=0x" |
40 | << Twine::utohexstr(Val: Info.Flags) << " ["; |
41 | switch (getBinding()) { |
42 | case wasm::WASM_SYMBOL_BINDING_GLOBAL: Out << "global"; break; |
43 | case wasm::WASM_SYMBOL_BINDING_LOCAL: Out << "local"; break; |
44 | case wasm::WASM_SYMBOL_BINDING_WEAK: Out << "weak"; break; |
45 | } |
46 | if (isHidden()) { |
47 | Out << ", hidden"; |
48 | } else { |
49 | Out << ", default"; |
50 | } |
51 | Out << "]"; |
52 | if (!isTypeData()) { |
53 | Out << ", ElemIndex="<< Info.ElementIndex; |
54 | } else if (isDefined()) { |
55 | Out << ", Segment="<< Info.DataRef.Segment; |
56 | Out << ", Offset="<< Info.DataRef.Offset; |
57 | Out << ", Size="<< Info.DataRef.Size; |
58 | } |
59 | } |
60 | |
61 | #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
62 | LLVM_DUMP_METHOD void WasmSymbol::dump() const { print(Out&: dbgs()); } |
63 | #endif |
64 | |
65 | Expected<std::unique_ptr<WasmObjectFile>> |
66 | ObjectFile::createWasmObjectFile(MemoryBufferRef Buffer) { |
67 | Error Err = Error::success(); |
68 | auto ObjectFile = std::make_unique<WasmObjectFile>(args&: Buffer, args&: Err); |
69 | if (Err) |
70 | return std::move(Err); |
71 | |
72 | return std::move(ObjectFile); |
73 | } |
74 | |
75 | #define VARINT7_MAX ((1 << 7) - 1) |
76 | #define VARINT7_MIN (-(1 << 7)) |
77 | #define VARUINT7_MAX (1 << 7) |
78 | #define VARUINT1_MAX (1) |
79 | |
80 | static uint8_t readUint8(WasmObjectFile::ReadContext &Ctx) { |
81 | if (Ctx.Ptr == Ctx.End) |
82 | report_fatal_error(reason: "EOF while reading uint8"); |
83 | return *Ctx.Ptr++; |
84 | } |
85 | |
86 | static uint32_t readUint32(WasmObjectFile::ReadContext &Ctx) { |
87 | if (Ctx.Ptr + 4 > Ctx.End) |
88 | report_fatal_error(reason: "EOF while reading uint32"); |
89 | uint32_t Result = support::endian::read32le(P: Ctx.Ptr); |
90 | Ctx.Ptr += 4; |
91 | return Result; |
92 | } |
93 | |
94 | static int32_t readFloat32(WasmObjectFile::ReadContext &Ctx) { |
95 | if (Ctx.Ptr + 4 > Ctx.End) |
96 | report_fatal_error(reason: "EOF while reading float64"); |
97 | int32_t Result = 0; |
98 | memcpy(dest: &Result, src: Ctx.Ptr, n: sizeof(Result)); |
99 | Ctx.Ptr += sizeof(Result); |
100 | return Result; |
101 | } |
102 | |
103 | static int64_t readFloat64(WasmObjectFile::ReadContext &Ctx) { |
104 | if (Ctx.Ptr + 8 > Ctx.End) |
105 | report_fatal_error(reason: "EOF while reading float64"); |
106 | int64_t Result = 0; |
107 | memcpy(dest: &Result, src: Ctx.Ptr, n: sizeof(Result)); |
108 | Ctx.Ptr += sizeof(Result); |
109 | return Result; |
110 | } |
111 | |
112 | static uint64_t readULEB128(WasmObjectFile::ReadContext &Ctx) { |
113 | unsigned Count; |
114 | const char *Error = nullptr; |
115 | uint64_t Result = decodeULEB128(p: Ctx.Ptr, n: &Count, end: Ctx.End, error: &Error); |
116 | if (Error) |
117 | report_fatal_error(reason: Error); |
118 | Ctx.Ptr += Count; |
119 | return Result; |
120 | } |
121 | |
122 | static StringRef readString(WasmObjectFile::ReadContext &Ctx) { |
123 | uint32_t StringLen = readULEB128(Ctx); |
124 | if (Ctx.Ptr + StringLen > Ctx.End) |
125 | report_fatal_error(reason: "EOF while reading string"); |
126 | StringRef Return = |
127 | StringRef(reinterpret_cast<const char *>(Ctx.Ptr), StringLen); |
128 | Ctx.Ptr += StringLen; |
129 | return Return; |
130 | } |
131 | |
132 | static int64_t readLEB128(WasmObjectFile::ReadContext &Ctx) { |
133 | unsigned Count; |
134 | const char *Error = nullptr; |
135 | uint64_t Result = decodeSLEB128(p: Ctx.Ptr, n: &Count, end: Ctx.End, error: &Error); |
136 | if (Error) |
137 | report_fatal_error(reason: Error); |
138 | Ctx.Ptr += Count; |
139 | return Result; |
140 | } |
141 | |
142 | static uint8_t readVaruint1(WasmObjectFile::ReadContext &Ctx) { |
143 | int64_t Result = readLEB128(Ctx); |
144 | if (Result > VARUINT1_MAX || Result < 0) |
145 | report_fatal_error(reason: "LEB is outside Varuint1 range"); |
146 | return Result; |
147 | } |
148 | |
149 | static int32_t readVarint32(WasmObjectFile::ReadContext &Ctx) { |
150 | int64_t Result = readLEB128(Ctx); |
151 | if (Result > INT32_MAX || Result < INT32_MIN) |
152 | report_fatal_error(reason: "LEB is outside Varint32 range"); |
153 | return Result; |
154 | } |
155 | |
156 | static uint32_t readVaruint32(WasmObjectFile::ReadContext &Ctx) { |
157 | uint64_t Result = readULEB128(Ctx); |
158 | if (Result > UINT32_MAX) |
159 | report_fatal_error(reason: "LEB is outside Varuint32 range"); |
160 | return Result; |
161 | } |
162 | |
163 | static int64_t readVarint64(WasmObjectFile::ReadContext &Ctx) { |
164 | return readLEB128(Ctx); |
165 | } |
166 | |
167 | static uint64_t readVaruint64(WasmObjectFile::ReadContext &Ctx) { |
168 | return readULEB128(Ctx); |
169 | } |
170 | |
171 | static uint8_t readOpcode(WasmObjectFile::ReadContext &Ctx) { |
172 | return readUint8(Ctx); |
173 | } |
174 | |
175 | static wasm::ValType parseValType(WasmObjectFile::ReadContext &Ctx, |
176 | uint32_t Code) { |
177 | // only directly encoded FUNCREF/EXTERNREF/EXNREF are supported |
178 | // (not ref null func, ref null extern, or ref null exn) |
179 | switch (Code) { |
180 | case wasm::WASM_TYPE_I32: |
181 | case wasm::WASM_TYPE_I64: |
182 | case wasm::WASM_TYPE_F32: |
183 | case wasm::WASM_TYPE_F64: |
184 | case wasm::WASM_TYPE_V128: |
185 | case wasm::WASM_TYPE_FUNCREF: |
186 | case wasm::WASM_TYPE_EXTERNREF: |
187 | case wasm::WASM_TYPE_EXNREF: |
188 | return wasm::ValType(Code); |
189 | } |
190 | if (Code == wasm::WASM_TYPE_NULLABLE || Code == wasm::WASM_TYPE_NONNULLABLE) { |
191 | /* Discard HeapType */ readVarint64(Ctx); |
192 | } |
193 | return wasm::ValType(wasm::ValType::OTHERREF); |
194 | } |
195 | |
196 | static Error readInitExpr(wasm::WasmInitExpr &Expr, |
197 | WasmObjectFile::ReadContext &Ctx) { |
198 | auto Start = Ctx.Ptr; |
199 | |
200 | Expr.Extended = false; |
201 | Expr.Inst.Opcode = readOpcode(Ctx); |
202 | switch (Expr.Inst.Opcode) { |
203 | case wasm::WASM_OPCODE_I32_CONST: |
204 | Expr.Inst.Value.Int32 = readVarint32(Ctx); |
205 | break; |
206 | case wasm::WASM_OPCODE_I64_CONST: |
207 | Expr.Inst.Value.Int64 = readVarint64(Ctx); |
208 | break; |
209 | case wasm::WASM_OPCODE_F32_CONST: |
210 | Expr.Inst.Value.Float32 = readFloat32(Ctx); |
211 | break; |
212 | case wasm::WASM_OPCODE_F64_CONST: |
213 | Expr.Inst.Value.Float64 = readFloat64(Ctx); |
214 | break; |
215 | case wasm::WASM_OPCODE_GLOBAL_GET: |
216 | Expr.Inst.Value.Global = readULEB128(Ctx); |
217 | break; |
218 | case wasm::WASM_OPCODE_REF_NULL: { |
219 | /* Discard type */ parseValType(Ctx, Code: readVaruint32(Ctx)); |
220 | break; |
221 | } |
222 | default: |
223 | Expr.Extended = true; |
224 | } |
225 | |
226 | if (!Expr.Extended) { |
227 | uint8_t EndOpcode = readOpcode(Ctx); |
228 | if (EndOpcode != wasm::WASM_OPCODE_END) |
229 | Expr.Extended = true; |
230 | } |
231 | |
232 | if (Expr.Extended) { |
233 | Ctx.Ptr = Start; |
234 | while (true) { |
235 | uint8_t Opcode = readOpcode(Ctx); |
236 | switch (Opcode) { |
237 | case wasm::WASM_OPCODE_I32_CONST: |
238 | case wasm::WASM_OPCODE_GLOBAL_GET: |
239 | case wasm::WASM_OPCODE_REF_NULL: |
240 | case wasm::WASM_OPCODE_REF_FUNC: |
241 | case wasm::WASM_OPCODE_I64_CONST: |
242 | readULEB128(Ctx); |
243 | break; |
244 | case wasm::WASM_OPCODE_F32_CONST: |
245 | readFloat32(Ctx); |
246 | break; |
247 | case wasm::WASM_OPCODE_F64_CONST: |
248 | readFloat64(Ctx); |
249 | break; |
250 | case wasm::WASM_OPCODE_I32_ADD: |
251 | case wasm::WASM_OPCODE_I32_SUB: |
252 | case wasm::WASM_OPCODE_I32_MUL: |
253 | case wasm::WASM_OPCODE_I64_ADD: |
254 | case wasm::WASM_OPCODE_I64_SUB: |
255 | case wasm::WASM_OPCODE_I64_MUL: |
256 | break; |
257 | case wasm::WASM_OPCODE_GC_PREFIX: |
258 | break; |
259 | // The GC opcodes are in a separate (prefixed space). This flat switch |
260 | // structure works as long as there is no overlap between the GC and |
261 | // general opcodes used in init exprs. |
262 | case wasm::WASM_OPCODE_STRUCT_NEW: |
263 | case wasm::WASM_OPCODE_STRUCT_NEW_DEFAULT: |
264 | case wasm::WASM_OPCODE_ARRAY_NEW: |
265 | case wasm::WASM_OPCODE_ARRAY_NEW_DEFAULT: |
266 | readULEB128(Ctx); // heap type index |
267 | break; |
268 | case wasm::WASM_OPCODE_ARRAY_NEW_FIXED: |
269 | readULEB128(Ctx); // heap type index |
270 | readULEB128(Ctx); // array size |
271 | break; |
272 | case wasm::WASM_OPCODE_REF_I31: |
273 | break; |
274 | case wasm::WASM_OPCODE_END: |
275 | Expr.Body = ArrayRef<uint8_t>(Start, Ctx.Ptr - Start); |
276 | return Error::success(); |
277 | default: |
278 | return make_error<GenericBinaryError>( |
279 | Args: Twine("invalid opcode in init_expr: ") + Twine(unsigned(Opcode)), |
280 | Args: object_error::parse_failed); |
281 | } |
282 | } |
283 | } |
284 | |
285 | return Error::success(); |
286 | } |
287 | |
288 | static wasm::WasmLimits readLimits(WasmObjectFile::ReadContext &Ctx) { |
289 | wasm::WasmLimits Result; |
290 | Result.Flags = readVaruint32(Ctx); |
291 | Result.Minimum = readVaruint64(Ctx); |
292 | if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX) |
293 | Result.Maximum = readVaruint64(Ctx); |
294 | if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_PAGE_SIZE) { |
295 | uint32_t PageSizeLog2 = readVaruint32(Ctx); |
296 | if (PageSizeLog2 >= 32) |
297 | report_fatal_error(reason: "log2(wasm page size) too large"); |
298 | Result.PageSize = 1 << PageSizeLog2; |
299 | } |
300 | return Result; |
301 | } |
302 | |
303 | static wasm::WasmTableType readTableType(WasmObjectFile::ReadContext &Ctx) { |
304 | wasm::WasmTableType TableType; |
305 | auto ElemType = parseValType(Ctx, Code: readVaruint32(Ctx)); |
306 | TableType.ElemType = ElemType; |
307 | TableType.Limits = readLimits(Ctx); |
308 | return TableType; |
309 | } |
310 | |
311 | static Error readSection(WasmSection &Section, WasmObjectFile::ReadContext &Ctx, |
312 | WasmSectionOrderChecker &Checker) { |
313 | Section.Type = readUint8(Ctx); |
314 | LLVM_DEBUG(dbgs() << "readSection type="<< Section.Type << "\n"); |
315 | // When reading the section's size, store the size of the LEB used to encode |
316 | // it. This allows objcopy/strip to reproduce the binary identically. |
317 | const uint8_t *PreSizePtr = Ctx.Ptr; |
318 | uint32_t Size = readVaruint32(Ctx); |
319 | Section.HeaderSecSizeEncodingLen = Ctx.Ptr - PreSizePtr; |
320 | Section.Offset = Ctx.Ptr - Ctx.Start; |
321 | if (Size == 0) |
322 | return make_error<StringError>(Args: "zero length section", |
323 | Args: object_error::parse_failed); |
324 | if (Ctx.Ptr + Size > Ctx.End) |
325 | return make_error<StringError>(Args: "section too large", |
326 | Args: object_error::parse_failed); |
327 | if (Section.Type == wasm::WASM_SEC_CUSTOM) { |
328 | WasmObjectFile::ReadContext SectionCtx; |
329 | SectionCtx.Start = Ctx.Ptr; |
330 | SectionCtx.Ptr = Ctx.Ptr; |
331 | SectionCtx.End = Ctx.Ptr + Size; |
332 | |
333 | Section.Name = readString(Ctx&: SectionCtx); |
334 | |
335 | uint32_t SectionNameSize = SectionCtx.Ptr - SectionCtx.Start; |
336 | Ctx.Ptr += SectionNameSize; |
337 | Size -= SectionNameSize; |
338 | } |
339 | |
340 | if (!Checker.isValidSectionOrder(ID: Section.Type, CustomSectionName: Section.Name)) { |
341 | return make_error<StringError>(Args: "out of order section type: "+ |
342 | llvm::to_string(Value: Section.Type), |
343 | Args: object_error::parse_failed); |
344 | } |
345 | |
346 | Section.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); |
347 | Ctx.Ptr += Size; |
348 | return Error::success(); |
349 | } |
350 | |
351 | WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err) |
352 | : ObjectFile(Binary::ID_Wasm, Buffer) { |
353 | ErrorAsOutParameter ErrAsOutParam(Err); |
354 | Header.Magic = getData().substr(Start: 0, N: 4); |
355 | if (Header.Magic != StringRef("\0asm", 4)) { |
356 | Err = make_error<StringError>(Args: "invalid magic number", |
357 | Args: object_error::parse_failed); |
358 | return; |
359 | } |
360 | |
361 | ReadContext Ctx; |
362 | Ctx.Start = getData().bytes_begin(); |
363 | Ctx.Ptr = Ctx.Start + 4; |
364 | Ctx.End = Ctx.Start + getData().size(); |
365 | |
366 | if (Ctx.Ptr + 4 > Ctx.End) { |
367 | Err = make_error<StringError>(Args: "missing version number", |
368 | Args: object_error::parse_failed); |
369 | return; |
370 | } |
371 | |
372 | Header.Version = readUint32(Ctx); |
373 | if (Header.Version != wasm::WasmVersion) { |
374 | Err = make_error<StringError>(Args: "invalid version number: "+ |
375 | Twine(Header.Version), |
376 | Args: object_error::parse_failed); |
377 | return; |
378 | } |
379 | |
380 | WasmSectionOrderChecker Checker; |
381 | while (Ctx.Ptr < Ctx.End) { |
382 | WasmSection Sec; |
383 | if ((Err = readSection(Section&: Sec, Ctx, Checker))) |
384 | return; |
385 | if ((Err = parseSection(Sec))) |
386 | return; |
387 | |
388 | Sections.push_back(x: Sec); |
389 | } |
390 | } |
391 | |
392 | Error WasmObjectFile::parseSection(WasmSection &Sec) { |
393 | ReadContext Ctx; |
394 | Ctx.Start = Sec.Content.data(); |
395 | Ctx.End = Ctx.Start + Sec.Content.size(); |
396 | Ctx.Ptr = Ctx.Start; |
397 | switch (Sec.Type) { |
398 | case wasm::WASM_SEC_CUSTOM: |
399 | return parseCustomSection(Sec, Ctx); |
400 | case wasm::WASM_SEC_TYPE: |
401 | return parseTypeSection(Ctx); |
402 | case wasm::WASM_SEC_IMPORT: |
403 | return parseImportSection(Ctx); |
404 | case wasm::WASM_SEC_FUNCTION: |
405 | return parseFunctionSection(Ctx); |
406 | case wasm::WASM_SEC_TABLE: |
407 | return parseTableSection(Ctx); |
408 | case wasm::WASM_SEC_MEMORY: |
409 | return parseMemorySection(Ctx); |
410 | case wasm::WASM_SEC_TAG: |
411 | return parseTagSection(Ctx); |
412 | case wasm::WASM_SEC_GLOBAL: |
413 | return parseGlobalSection(Ctx); |
414 | case wasm::WASM_SEC_EXPORT: |
415 | return parseExportSection(Ctx); |
416 | case wasm::WASM_SEC_START: |
417 | return parseStartSection(Ctx); |
418 | case wasm::WASM_SEC_ELEM: |
419 | return parseElemSection(Ctx); |
420 | case wasm::WASM_SEC_CODE: |
421 | return parseCodeSection(Ctx); |
422 | case wasm::WASM_SEC_DATA: |
423 | return parseDataSection(Ctx); |
424 | case wasm::WASM_SEC_DATACOUNT: |
425 | return parseDataCountSection(Ctx); |
426 | default: |
427 | return make_error<GenericBinaryError>( |
428 | Args: "invalid section type: "+ Twine(Sec.Type), Args: object_error::parse_failed); |
429 | } |
430 | } |
431 | |
432 | Error WasmObjectFile::parseDylinkSection(ReadContext &Ctx) { |
433 | // Legacy "dylink" section support. |
434 | // See parseDylink0Section for the current "dylink.0" section parsing. |
435 | HasDylinkSection = true; |
436 | DylinkInfo.MemorySize = readVaruint32(Ctx); |
437 | DylinkInfo.MemoryAlignment = readVaruint32(Ctx); |
438 | DylinkInfo.TableSize = readVaruint32(Ctx); |
439 | DylinkInfo.TableAlignment = readVaruint32(Ctx); |
440 | uint32_t Count = readVaruint32(Ctx); |
441 | while (Count--) { |
442 | DylinkInfo.Needed.push_back(x: readString(Ctx)); |
443 | } |
444 | |
445 | if (Ctx.Ptr != Ctx.End) |
446 | return make_error<GenericBinaryError>(Args: "dylink section ended prematurely", |
447 | Args: object_error::parse_failed); |
448 | return Error::success(); |
449 | } |
450 | |
451 | Error WasmObjectFile::parseDylink0Section(ReadContext &Ctx) { |
452 | // See |
453 | // https://github.com/WebAssembly/tool-conventions/blob/main/DynamicLinking.md |
454 | HasDylinkSection = true; |
455 | |
456 | const uint8_t *OrigEnd = Ctx.End; |
457 | while (Ctx.Ptr < OrigEnd) { |
458 | Ctx.End = OrigEnd; |
459 | uint8_t Type = readUint8(Ctx); |
460 | uint32_t Size = readVaruint32(Ctx); |
461 | LLVM_DEBUG(dbgs() << "readSubsection type="<< int(Type) << " size="<< Size |
462 | << "\n"); |
463 | Ctx.End = Ctx.Ptr + Size; |
464 | uint32_t Count; |
465 | switch (Type) { |
466 | case wasm::WASM_DYLINK_MEM_INFO: |
467 | DylinkInfo.MemorySize = readVaruint32(Ctx); |
468 | DylinkInfo.MemoryAlignment = readVaruint32(Ctx); |
469 | DylinkInfo.TableSize = readVaruint32(Ctx); |
470 | DylinkInfo.TableAlignment = readVaruint32(Ctx); |
471 | break; |
472 | case wasm::WASM_DYLINK_NEEDED: |
473 | Count = readVaruint32(Ctx); |
474 | while (Count--) { |
475 | DylinkInfo.Needed.push_back(x: readString(Ctx)); |
476 | } |
477 | break; |
478 | case wasm::WASM_DYLINK_EXPORT_INFO: { |
479 | uint32_t Count = readVaruint32(Ctx); |
480 | while (Count--) { |
481 | DylinkInfo.ExportInfo.push_back(x: {.Name: readString(Ctx), .Flags: readVaruint32(Ctx)}); |
482 | } |
483 | break; |
484 | } |
485 | case wasm::WASM_DYLINK_IMPORT_INFO: { |
486 | uint32_t Count = readVaruint32(Ctx); |
487 | while (Count--) { |
488 | DylinkInfo.ImportInfo.push_back( |
489 | x: {.Module: readString(Ctx), .Field: readString(Ctx), .Flags: readVaruint32(Ctx)}); |
490 | } |
491 | break; |
492 | } |
493 | case wasm::WASM_DYLINK_RUNTIME_PATH: { |
494 | Count = readVaruint32(Ctx); |
495 | while (Count--) { |
496 | DylinkInfo.RuntimePath.push_back(x: readString(Ctx)); |
497 | } |
498 | break; |
499 | } |
500 | default: |
501 | LLVM_DEBUG(dbgs() << "unknown dylink.0 sub-section: "<< Type << "\n"); |
502 | Ctx.Ptr += Size; |
503 | break; |
504 | } |
505 | if (Ctx.Ptr != Ctx.End) { |
506 | return make_error<GenericBinaryError>( |
507 | Args: "dylink.0 sub-section ended prematurely", Args: object_error::parse_failed); |
508 | } |
509 | } |
510 | |
511 | if (Ctx.Ptr != Ctx.End) |
512 | return make_error<GenericBinaryError>(Args: "dylink.0 section ended prematurely", |
513 | Args: object_error::parse_failed); |
514 | return Error::success(); |
515 | } |
516 | |
517 | Error WasmObjectFile::parseNameSection(ReadContext &Ctx) { |
518 | llvm::DenseSet<uint64_t> SeenFunctions; |
519 | llvm::DenseSet<uint64_t> SeenGlobals; |
520 | llvm::DenseSet<uint64_t> SeenSegments; |
521 | |
522 | // If we have linking section (symbol table) or if we are parsing a DSO |
523 | // then we don't use the name section for symbol information. |
524 | bool PopulateSymbolTable = !HasLinkingSection && !HasDylinkSection; |
525 | |
526 | // If we are using the name section for symbol information then it will |
527 | // supersede any symbols created by the export section. |
528 | if (PopulateSymbolTable) |
529 | Symbols.clear(); |
530 | |
531 | while (Ctx.Ptr < Ctx.End) { |
532 | uint8_t Type = readUint8(Ctx); |
533 | uint32_t Size = readVaruint32(Ctx); |
534 | const uint8_t *SubSectionEnd = Ctx.Ptr + Size; |
535 | |
536 | switch (Type) { |
537 | case wasm::WASM_NAMES_FUNCTION: |
538 | case wasm::WASM_NAMES_GLOBAL: |
539 | case wasm::WASM_NAMES_DATA_SEGMENT: { |
540 | uint32_t Count = readVaruint32(Ctx); |
541 | while (Count--) { |
542 | uint32_t Index = readVaruint32(Ctx); |
543 | StringRef Name = readString(Ctx); |
544 | wasm::NameType nameType = wasm::NameType::FUNCTION; |
545 | wasm::WasmSymbolInfo Info{.Name: Name, |
546 | /*Kind */ wasm::WASM_SYMBOL_TYPE_FUNCTION, |
547 | /* Flags */ 0, |
548 | /* ImportModule */ std::nullopt, |
549 | /* ImportName */ std::nullopt, |
550 | /* ExportName */ std::nullopt, |
551 | {/* ElementIndex */ Index}}; |
552 | const wasm::WasmSignature *Signature = nullptr; |
553 | const wasm::WasmGlobalType *GlobalType = nullptr; |
554 | const wasm::WasmTableType *TableType = nullptr; |
555 | if (Type == wasm::WASM_NAMES_FUNCTION) { |
556 | if (!SeenFunctions.insert(V: Index).second) |
557 | return make_error<GenericBinaryError>( |
558 | Args: "function named more than once", Args: object_error::parse_failed); |
559 | if (!isValidFunctionIndex(Index) || Name.empty()) |
560 | return make_error<GenericBinaryError>(Args: "invalid function name entry", |
561 | Args: object_error::parse_failed); |
562 | |
563 | if (isDefinedFunctionIndex(Index)) { |
564 | wasm::WasmFunction &F = getDefinedFunction(Index); |
565 | F.DebugName = Name; |
566 | Signature = &Signatures[F.SigIndex]; |
567 | if (F.ExportName) { |
568 | Info.ExportName = F.ExportName; |
569 | Info.Flags |= wasm::WASM_SYMBOL_BINDING_GLOBAL; |
570 | } else { |
571 | Info.Flags |= wasm::WASM_SYMBOL_BINDING_LOCAL; |
572 | } |
573 | } else { |
574 | Info.Flags |= wasm::WASM_SYMBOL_UNDEFINED; |
575 | } |
576 | } else if (Type == wasm::WASM_NAMES_GLOBAL) { |
577 | if (!SeenGlobals.insert(V: Index).second) |
578 | return make_error<GenericBinaryError>(Args: "global named more than once", |
579 | Args: object_error::parse_failed); |
580 | if (!isValidGlobalIndex(Index) || Name.empty()) |
581 | return make_error<GenericBinaryError>(Args: "invalid global name entry", |
582 | Args: object_error::parse_failed); |
583 | nameType = wasm::NameType::GLOBAL; |
584 | Info.Kind = wasm::WASM_SYMBOL_TYPE_GLOBAL; |
585 | if (isDefinedGlobalIndex(Index)) { |
586 | GlobalType = &getDefinedGlobal(Index).Type; |
587 | } else { |
588 | Info.Flags |= wasm::WASM_SYMBOL_UNDEFINED; |
589 | } |
590 | } else { |
591 | if (!SeenSegments.insert(V: Index).second) |
592 | return make_error<GenericBinaryError>( |
593 | Args: "segment named more than once", Args: object_error::parse_failed); |
594 | if (Index > DataSegments.size()) |
595 | return make_error<GenericBinaryError>(Args: "invalid data segment name entry", |
596 | Args: object_error::parse_failed); |
597 | nameType = wasm::NameType::DATA_SEGMENT; |
598 | Info.Kind = wasm::WASM_SYMBOL_TYPE_DATA; |
599 | Info.Flags |= wasm::WASM_SYMBOL_BINDING_LOCAL; |
600 | assert(Index < DataSegments.size()); |
601 | Info.DataRef = wasm::WasmDataReference{ |
602 | .Segment: Index, .Offset: 0, .Size: DataSegments[Index].Data.Content.size()}; |
603 | } |
604 | DebugNames.push_back(x: wasm::WasmDebugName{.Type: nameType, .Index: Index, .Name: Name}); |
605 | if (PopulateSymbolTable) |
606 | Symbols.emplace_back(args&: Info, args&: GlobalType, args&: TableType, args&: Signature); |
607 | } |
608 | break; |
609 | } |
610 | // Ignore local names for now |
611 | case wasm::WASM_NAMES_LOCAL: |
612 | default: |
613 | Ctx.Ptr += Size; |
614 | break; |
615 | } |
616 | if (Ctx.Ptr != SubSectionEnd) |
617 | return make_error<GenericBinaryError>( |
618 | Args: "name sub-section ended prematurely", Args: object_error::parse_failed); |
619 | } |
620 | |
621 | if (Ctx.Ptr != Ctx.End) |
622 | return make_error<GenericBinaryError>(Args: "name section ended prematurely", |
623 | Args: object_error::parse_failed); |
624 | return Error::success(); |
625 | } |
626 | |
627 | Error WasmObjectFile::parseLinkingSection(ReadContext &Ctx) { |
628 | HasLinkingSection = true; |
629 | |
630 | LinkingData.Version = readVaruint32(Ctx); |
631 | if (LinkingData.Version != wasm::WasmMetadataVersion) { |
632 | return make_error<GenericBinaryError>( |
633 | Args: "unexpected metadata version: "+ Twine(LinkingData.Version) + |
634 | " (Expected: "+ Twine(wasm::WasmMetadataVersion) + ")", |
635 | Args: object_error::parse_failed); |
636 | } |
637 | |
638 | const uint8_t *OrigEnd = Ctx.End; |
639 | while (Ctx.Ptr < OrigEnd) { |
640 | Ctx.End = OrigEnd; |
641 | uint8_t Type = readUint8(Ctx); |
642 | uint32_t Size = readVaruint32(Ctx); |
643 | LLVM_DEBUG(dbgs() << "readSubsection type="<< int(Type) << " size="<< Size |
644 | << "\n"); |
645 | Ctx.End = Ctx.Ptr + Size; |
646 | switch (Type) { |
647 | case wasm::WASM_SYMBOL_TABLE: |
648 | if (Error Err = parseLinkingSectionSymtab(Ctx)) |
649 | return Err; |
650 | break; |
651 | case wasm::WASM_SEGMENT_INFO: { |
652 | uint32_t Count = readVaruint32(Ctx); |
653 | if (Count > DataSegments.size()) |
654 | return make_error<GenericBinaryError>(Args: "too many segment names", |
655 | Args: object_error::parse_failed); |
656 | for (uint32_t I = 0; I < Count; I++) { |
657 | DataSegments[I].Data.Name = readString(Ctx); |
658 | DataSegments[I].Data.Alignment = readVaruint32(Ctx); |
659 | DataSegments[I].Data.LinkingFlags = readVaruint32(Ctx); |
660 | } |
661 | break; |
662 | } |
663 | case wasm::WASM_INIT_FUNCS: { |
664 | uint32_t Count = readVaruint32(Ctx); |
665 | LinkingData.InitFunctions.reserve(n: Count); |
666 | for (uint32_t I = 0; I < Count; I++) { |
667 | wasm::WasmInitFunc Init; |
668 | Init.Priority = readVaruint32(Ctx); |
669 | Init.Symbol = readVaruint32(Ctx); |
670 | if (!isValidFunctionSymbol(Index: Init.Symbol)) |
671 | return make_error<GenericBinaryError>(Args: "invalid function symbol: "+ |
672 | Twine(Init.Symbol), |
673 | Args: object_error::parse_failed); |
674 | LinkingData.InitFunctions.emplace_back(args&: Init); |
675 | } |
676 | break; |
677 | } |
678 | case wasm::WASM_COMDAT_INFO: |
679 | if (Error Err = parseLinkingSectionComdat(Ctx)) |
680 | return Err; |
681 | break; |
682 | default: |
683 | Ctx.Ptr += Size; |
684 | break; |
685 | } |
686 | if (Ctx.Ptr != Ctx.End) |
687 | return make_error<GenericBinaryError>( |
688 | Args: "linking sub-section ended prematurely", Args: object_error::parse_failed); |
689 | } |
690 | if (Ctx.Ptr != OrigEnd) |
691 | return make_error<GenericBinaryError>(Args: "linking section ended prematurely", |
692 | Args: object_error::parse_failed); |
693 | return Error::success(); |
694 | } |
695 | |
696 | Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) { |
697 | uint32_t Count = readVaruint32(Ctx); |
698 | // Clear out any symbol information that was derived from the exports |
699 | // section. |
700 | Symbols.clear(); |
701 | Symbols.reserve(n: Count); |
702 | StringSet<> SymbolNames; |
703 | |
704 | std::vector<wasm::WasmImport *> ImportedGlobals; |
705 | std::vector<wasm::WasmImport *> ImportedFunctions; |
706 | std::vector<wasm::WasmImport *> ImportedTags; |
707 | std::vector<wasm::WasmImport *> ImportedTables; |
708 | ImportedGlobals.reserve(n: Imports.size()); |
709 | ImportedFunctions.reserve(n: Imports.size()); |
710 | ImportedTags.reserve(n: Imports.size()); |
711 | ImportedTables.reserve(n: Imports.size()); |
712 | for (auto &I : Imports) { |
713 | if (I.Kind == wasm::WASM_EXTERNAL_FUNCTION) |
714 | ImportedFunctions.emplace_back(args: &I); |
715 | else if (I.Kind == wasm::WASM_EXTERNAL_GLOBAL) |
716 | ImportedGlobals.emplace_back(args: &I); |
717 | else if (I.Kind == wasm::WASM_EXTERNAL_TAG) |
718 | ImportedTags.emplace_back(args: &I); |
719 | else if (I.Kind == wasm::WASM_EXTERNAL_TABLE) |
720 | ImportedTables.emplace_back(args: &I); |
721 | } |
722 | |
723 | while (Count--) { |
724 | wasm::WasmSymbolInfo Info; |
725 | const wasm::WasmSignature *Signature = nullptr; |
726 | const wasm::WasmGlobalType *GlobalType = nullptr; |
727 | const wasm::WasmTableType *TableType = nullptr; |
728 | |
729 | Info.Kind = readUint8(Ctx); |
730 | Info.Flags = readVaruint32(Ctx); |
731 | bool IsDefined = (Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0; |
732 | |
733 | switch (Info.Kind) { |
734 | case wasm::WASM_SYMBOL_TYPE_FUNCTION: |
735 | Info.ElementIndex = readVaruint32(Ctx); |
736 | if (!isValidFunctionIndex(Index: Info.ElementIndex) || |
737 | IsDefined != isDefinedFunctionIndex(Index: Info.ElementIndex)) |
738 | return make_error<GenericBinaryError>(Args: "invalid function symbol index", |
739 | Args: object_error::parse_failed); |
740 | if (IsDefined) { |
741 | Info.Name = readString(Ctx); |
742 | unsigned FuncIndex = Info.ElementIndex - NumImportedFunctions; |
743 | wasm::WasmFunction &Function = Functions[FuncIndex]; |
744 | Signature = &Signatures[Function.SigIndex]; |
745 | if (Function.SymbolName.empty()) |
746 | Function.SymbolName = Info.Name; |
747 | } else { |
748 | wasm::WasmImport &Import = *ImportedFunctions[Info.ElementIndex]; |
749 | if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { |
750 | Info.Name = readString(Ctx); |
751 | Info.ImportName = Import.Field; |
752 | } else { |
753 | Info.Name = Import.Field; |
754 | } |
755 | Signature = &Signatures[Import.SigIndex]; |
756 | Info.ImportModule = Import.Module; |
757 | } |
758 | break; |
759 | |
760 | case wasm::WASM_SYMBOL_TYPE_GLOBAL: |
761 | Info.ElementIndex = readVaruint32(Ctx); |
762 | if (!isValidGlobalIndex(Index: Info.ElementIndex) || |
763 | IsDefined != isDefinedGlobalIndex(Index: Info.ElementIndex)) |
764 | return make_error<GenericBinaryError>(Args: "invalid global symbol index", |
765 | Args: object_error::parse_failed); |
766 | if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == |
767 | wasm::WASM_SYMBOL_BINDING_WEAK) |
768 | return make_error<GenericBinaryError>(Args: "undefined weak global symbol", |
769 | Args: object_error::parse_failed); |
770 | if (IsDefined) { |
771 | Info.Name = readString(Ctx); |
772 | unsigned GlobalIndex = Info.ElementIndex - NumImportedGlobals; |
773 | wasm::WasmGlobal &Global = Globals[GlobalIndex]; |
774 | GlobalType = &Global.Type; |
775 | if (Global.SymbolName.empty()) |
776 | Global.SymbolName = Info.Name; |
777 | } else { |
778 | wasm::WasmImport &Import = *ImportedGlobals[Info.ElementIndex]; |
779 | if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { |
780 | Info.Name = readString(Ctx); |
781 | Info.ImportName = Import.Field; |
782 | } else { |
783 | Info.Name = Import.Field; |
784 | } |
785 | GlobalType = &Import.Global; |
786 | Info.ImportModule = Import.Module; |
787 | } |
788 | break; |
789 | |
790 | case wasm::WASM_SYMBOL_TYPE_TABLE: |
791 | Info.ElementIndex = readVaruint32(Ctx); |
792 | if (!isValidTableNumber(Index: Info.ElementIndex) || |
793 | IsDefined != isDefinedTableNumber(Index: Info.ElementIndex)) |
794 | return make_error<GenericBinaryError>(Args: "invalid table symbol index", |
795 | Args: object_error::parse_failed); |
796 | if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == |
797 | wasm::WASM_SYMBOL_BINDING_WEAK) |
798 | return make_error<GenericBinaryError>(Args: "undefined weak table symbol", |
799 | Args: object_error::parse_failed); |
800 | if (IsDefined) { |
801 | Info.Name = readString(Ctx); |
802 | unsigned TableNumber = Info.ElementIndex - NumImportedTables; |
803 | wasm::WasmTable &Table = Tables[TableNumber]; |
804 | TableType = &Table.Type; |
805 | if (Table.SymbolName.empty()) |
806 | Table.SymbolName = Info.Name; |
807 | } else { |
808 | wasm::WasmImport &Import = *ImportedTables[Info.ElementIndex]; |
809 | if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { |
810 | Info.Name = readString(Ctx); |
811 | Info.ImportName = Import.Field; |
812 | } else { |
813 | Info.Name = Import.Field; |
814 | } |
815 | TableType = &Import.Table; |
816 | Info.ImportModule = Import.Module; |
817 | } |
818 | break; |
819 | |
820 | case wasm::WASM_SYMBOL_TYPE_DATA: |
821 | Info.Name = readString(Ctx); |
822 | if (IsDefined) { |
823 | auto Index = readVaruint32(Ctx); |
824 | auto Offset = readVaruint64(Ctx); |
825 | auto Size = readVaruint64(Ctx); |
826 | if (!(Info.Flags & wasm::WASM_SYMBOL_ABSOLUTE)) { |
827 | if (static_cast<size_t>(Index) >= DataSegments.size()) |
828 | return make_error<GenericBinaryError>( |
829 | Args: "invalid data segment index: "+ Twine(Index), |
830 | Args: object_error::parse_failed); |
831 | size_t SegmentSize = DataSegments[Index].Data.Content.size(); |
832 | if (Offset > SegmentSize) |
833 | return make_error<GenericBinaryError>( |
834 | Args: "invalid data symbol offset: `"+ Info.Name + |
835 | "` (offset: "+ Twine(Offset) + |
836 | " segment size: "+ Twine(SegmentSize) + ")", |
837 | Args: object_error::parse_failed); |
838 | } |
839 | Info.DataRef = wasm::WasmDataReference{.Segment: Index, .Offset: Offset, .Size: Size}; |
840 | } |
841 | break; |
842 | |
843 | case wasm::WASM_SYMBOL_TYPE_SECTION: { |
844 | if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != |
845 | wasm::WASM_SYMBOL_BINDING_LOCAL) |
846 | return make_error<GenericBinaryError>( |
847 | Args: "section symbols must have local binding", |
848 | Args: object_error::parse_failed); |
849 | Info.ElementIndex = readVaruint32(Ctx); |
850 | // Use somewhat unique section name as symbol name. |
851 | StringRef SectionName = Sections[Info.ElementIndex].Name; |
852 | Info.Name = SectionName; |
853 | break; |
854 | } |
855 | |
856 | case wasm::WASM_SYMBOL_TYPE_TAG: { |
857 | Info.ElementIndex = readVaruint32(Ctx); |
858 | if (!isValidTagIndex(Index: Info.ElementIndex) || |
859 | IsDefined != isDefinedTagIndex(Index: Info.ElementIndex)) |
860 | return make_error<GenericBinaryError>(Args: "invalid tag symbol index", |
861 | Args: object_error::parse_failed); |
862 | if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == |
863 | wasm::WASM_SYMBOL_BINDING_WEAK) |
864 | return make_error<GenericBinaryError>(Args: "undefined weak global symbol", |
865 | Args: object_error::parse_failed); |
866 | if (IsDefined) { |
867 | Info.Name = readString(Ctx); |
868 | unsigned TagIndex = Info.ElementIndex - NumImportedTags; |
869 | wasm::WasmTag &Tag = Tags[TagIndex]; |
870 | Signature = &Signatures[Tag.SigIndex]; |
871 | if (Tag.SymbolName.empty()) |
872 | Tag.SymbolName = Info.Name; |
873 | |
874 | } else { |
875 | wasm::WasmImport &Import = *ImportedTags[Info.ElementIndex]; |
876 | if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { |
877 | Info.Name = readString(Ctx); |
878 | Info.ImportName = Import.Field; |
879 | } else { |
880 | Info.Name = Import.Field; |
881 | } |
882 | Signature = &Signatures[Import.SigIndex]; |
883 | Info.ImportModule = Import.Module; |
884 | } |
885 | break; |
886 | } |
887 | |
888 | default: |
889 | return make_error<GenericBinaryError>(Args: "invalid symbol type: "+ |
890 | Twine(unsigned(Info.Kind)), |
891 | Args: object_error::parse_failed); |
892 | } |
893 | |
894 | if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != |
895 | wasm::WASM_SYMBOL_BINDING_LOCAL && |
896 | !SymbolNames.insert(key: Info.Name).second) |
897 | return make_error<GenericBinaryError>(Args: "duplicate symbol name "+ |
898 | Twine(Info.Name), |
899 | Args: object_error::parse_failed); |
900 | Symbols.emplace_back(args&: Info, args&: GlobalType, args&: TableType, args&: Signature); |
901 | LLVM_DEBUG(dbgs() << "Adding symbol: "<< Symbols.back() << "\n"); |
902 | } |
903 | |
904 | return Error::success(); |
905 | } |
906 | |
907 | Error WasmObjectFile::parseLinkingSectionComdat(ReadContext &Ctx) { |
908 | uint32_t ComdatCount = readVaruint32(Ctx); |
909 | StringSet<> ComdatSet; |
910 | for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) { |
911 | StringRef Name = readString(Ctx); |
912 | if (Name.empty() || !ComdatSet.insert(key: Name).second) |
913 | return make_error<GenericBinaryError>(Args: "bad/duplicate COMDAT name "+ |
914 | Twine(Name), |
915 | Args: object_error::parse_failed); |
916 | LinkingData.Comdats.emplace_back(args&: Name); |
917 | uint32_t Flags = readVaruint32(Ctx); |
918 | if (Flags != 0) |
919 | return make_error<GenericBinaryError>(Args: "unsupported COMDAT flags", |
920 | Args: object_error::parse_failed); |
921 | |
922 | uint32_t EntryCount = readVaruint32(Ctx); |
923 | while (EntryCount--) { |
924 | unsigned Kind = readVaruint32(Ctx); |
925 | unsigned Index = readVaruint32(Ctx); |
926 | switch (Kind) { |
927 | default: |
928 | return make_error<GenericBinaryError>(Args: "invalid COMDAT entry type", |
929 | Args: object_error::parse_failed); |
930 | case wasm::WASM_COMDAT_DATA: |
931 | if (Index >= DataSegments.size()) |
932 | return make_error<GenericBinaryError>( |
933 | Args: "COMDAT data index out of range", Args: object_error::parse_failed); |
934 | if (DataSegments[Index].Data.Comdat != UINT32_MAX) |
935 | return make_error<GenericBinaryError>(Args: "data segment in two COMDATs", |
936 | Args: object_error::parse_failed); |
937 | DataSegments[Index].Data.Comdat = ComdatIndex; |
938 | break; |
939 | case wasm::WASM_COMDAT_FUNCTION: |
940 | if (!isDefinedFunctionIndex(Index)) |
941 | return make_error<GenericBinaryError>( |
942 | Args: "COMDAT function index out of range", Args: object_error::parse_failed); |
943 | if (getDefinedFunction(Index).Comdat != UINT32_MAX) |
944 | return make_error<GenericBinaryError>(Args: "function in two COMDATs", |
945 | Args: object_error::parse_failed); |
946 | getDefinedFunction(Index).Comdat = ComdatIndex; |
947 | break; |
948 | case wasm::WASM_COMDAT_SECTION: |
949 | if (Index >= Sections.size()) |
950 | return make_error<GenericBinaryError>( |
951 | Args: "COMDAT section index out of range", Args: object_error::parse_failed); |
952 | if (Sections[Index].Type != wasm::WASM_SEC_CUSTOM) |
953 | return make_error<GenericBinaryError>( |
954 | Args: "non-custom section in a COMDAT", Args: object_error::parse_failed); |
955 | Sections[Index].Comdat = ComdatIndex; |
956 | break; |
957 | } |
958 | } |
959 | } |
960 | return Error::success(); |
961 | } |
962 | |
963 | Error WasmObjectFile::parseProducersSection(ReadContext &Ctx) { |
964 | llvm::SmallSet<StringRef, 3> FieldsSeen; |
965 | uint32_t Fields = readVaruint32(Ctx); |
966 | for (size_t I = 0; I < Fields; ++I) { |
967 | StringRef FieldName = readString(Ctx); |
968 | if (!FieldsSeen.insert(V: FieldName).second) |
969 | return make_error<GenericBinaryError>( |
970 | Args: "producers section does not have unique fields", |
971 | Args: object_error::parse_failed); |
972 | std::vector<std::pair<std::string, std::string>> *ProducerVec = nullptr; |
973 | if (FieldName == "language") { |
974 | ProducerVec = &ProducerInfo.Languages; |
975 | } else if (FieldName == "processed-by") { |
976 | ProducerVec = &ProducerInfo.Tools; |
977 | } else if (FieldName == "sdk") { |
978 | ProducerVec = &ProducerInfo.SDKs; |
979 | } else { |
980 | return make_error<GenericBinaryError>( |
981 | Args: "producers section field is not named one of language, processed-by, " |
982 | "or sdk", |
983 | Args: object_error::parse_failed); |
984 | } |
985 | uint32_t ValueCount = readVaruint32(Ctx); |
986 | llvm::SmallSet<StringRef, 8> ProducersSeen; |
987 | for (size_t J = 0; J < ValueCount; ++J) { |
988 | StringRef Name = readString(Ctx); |
989 | StringRef Version = readString(Ctx); |
990 | if (!ProducersSeen.insert(V: Name).second) { |
991 | return make_error<GenericBinaryError>( |
992 | Args: "producers section contains repeated producer", |
993 | Args: object_error::parse_failed); |
994 | } |
995 | ProducerVec->emplace_back(args: std::string(Name), args: std::string(Version)); |
996 | } |
997 | } |
998 | if (Ctx.Ptr != Ctx.End) |
999 | return make_error<GenericBinaryError>(Args: "producers section ended prematurely", |
1000 | Args: object_error::parse_failed); |
1001 | return Error::success(); |
1002 | } |
1003 | |
1004 | Error WasmObjectFile::parseTargetFeaturesSection(ReadContext &Ctx) { |
1005 | llvm::SmallSet<std::string, 8> FeaturesSeen; |
1006 | uint32_t FeatureCount = readVaruint32(Ctx); |
1007 | for (size_t I = 0; I < FeatureCount; ++I) { |
1008 | wasm::WasmFeatureEntry Feature; |
1009 | Feature.Prefix = readUint8(Ctx); |
1010 | switch (Feature.Prefix) { |
1011 | case wasm::WASM_FEATURE_PREFIX_USED: |
1012 | case wasm::WASM_FEATURE_PREFIX_DISALLOWED: |
1013 | break; |
1014 | default: |
1015 | return make_error<GenericBinaryError>(Args: "unknown feature policy prefix", |
1016 | Args: object_error::parse_failed); |
1017 | } |
1018 | Feature.Name = std::string(readString(Ctx)); |
1019 | if (!FeaturesSeen.insert(V: Feature.Name).second) |
1020 | return make_error<GenericBinaryError>( |
1021 | Args: "target features section contains repeated feature \""+ |
1022 | Feature.Name + "\"", |
1023 | Args: object_error::parse_failed); |
1024 | TargetFeatures.push_back(x: Feature); |
1025 | } |
1026 | if (Ctx.Ptr != Ctx.End) |
1027 | return make_error<GenericBinaryError>( |
1028 | Args: "target features section ended prematurely", |
1029 | Args: object_error::parse_failed); |
1030 | return Error::success(); |
1031 | } |
1032 | |
1033 | Error WasmObjectFile::parseRelocSection(StringRef Name, ReadContext &Ctx) { |
1034 | uint32_t SectionIndex = readVaruint32(Ctx); |
1035 | if (SectionIndex >= Sections.size()) |
1036 | return make_error<GenericBinaryError>(Args: "invalid section index", |
1037 | Args: object_error::parse_failed); |
1038 | WasmSection &Section = Sections[SectionIndex]; |
1039 | uint32_t RelocCount = readVaruint32(Ctx); |
1040 | uint32_t EndOffset = Section.Content.size(); |
1041 | uint32_t PreviousOffset = 0; |
1042 | while (RelocCount--) { |
1043 | wasm::WasmRelocation Reloc = {}; |
1044 | uint32_t type = readVaruint32(Ctx); |
1045 | Reloc.Type = type; |
1046 | Reloc.Offset = readVaruint32(Ctx); |
1047 | if (Reloc.Offset < PreviousOffset) |
1048 | return make_error<GenericBinaryError>(Args: "relocations not in offset order", |
1049 | Args: object_error::parse_failed); |
1050 | |
1051 | auto badReloc = [&](StringRef msg) { |
1052 | return make_error<GenericBinaryError>( |
1053 | Args: msg + ": "+ Twine(Symbols[Reloc.Index].Info.Name), |
1054 | Args: object_error::parse_failed); |
1055 | }; |
1056 | |
1057 | PreviousOffset = Reloc.Offset; |
1058 | Reloc.Index = readVaruint32(Ctx); |
1059 | switch (type) { |
1060 | case wasm::R_WASM_FUNCTION_INDEX_LEB: |
1061 | case wasm::R_WASM_FUNCTION_INDEX_I32: |
1062 | case wasm::R_WASM_TABLE_INDEX_SLEB: |
1063 | case wasm::R_WASM_TABLE_INDEX_SLEB64: |
1064 | case wasm::R_WASM_TABLE_INDEX_I32: |
1065 | case wasm::R_WASM_TABLE_INDEX_I64: |
1066 | case wasm::R_WASM_TABLE_INDEX_REL_SLEB: |
1067 | case wasm::R_WASM_TABLE_INDEX_REL_SLEB64: |
1068 | if (!isValidFunctionSymbol(Index: Reloc.Index)) |
1069 | return badReloc("invalid function relocation"); |
1070 | break; |
1071 | case wasm::R_WASM_TABLE_NUMBER_LEB: |
1072 | if (!isValidTableSymbol(Index: Reloc.Index)) |
1073 | return badReloc("invalid table relocation"); |
1074 | break; |
1075 | case wasm::R_WASM_TYPE_INDEX_LEB: |
1076 | if (Reloc.Index >= Signatures.size()) |
1077 | return badReloc("invalid relocation type index"); |
1078 | break; |
1079 | case wasm::R_WASM_GLOBAL_INDEX_LEB: |
1080 | // R_WASM_GLOBAL_INDEX_LEB are can be used against function and data |
1081 | // symbols to refer to their GOT entries. |
1082 | if (!isValidGlobalSymbol(Index: Reloc.Index) && |
1083 | !isValidDataSymbol(Index: Reloc.Index) && |
1084 | !isValidFunctionSymbol(Index: Reloc.Index)) |
1085 | return badReloc("invalid global relocation"); |
1086 | break; |
1087 | case wasm::R_WASM_GLOBAL_INDEX_I32: |
1088 | if (!isValidGlobalSymbol(Index: Reloc.Index)) |
1089 | return badReloc("invalid global relocation"); |
1090 | break; |
1091 | case wasm::R_WASM_TAG_INDEX_LEB: |
1092 | if (!isValidTagSymbol(Index: Reloc.Index)) |
1093 | return badReloc("invalid tag relocation"); |
1094 | break; |
1095 | case wasm::R_WASM_MEMORY_ADDR_LEB: |
1096 | case wasm::R_WASM_MEMORY_ADDR_SLEB: |
1097 | case wasm::R_WASM_MEMORY_ADDR_I32: |
1098 | case wasm::R_WASM_MEMORY_ADDR_REL_SLEB: |
1099 | case wasm::R_WASM_MEMORY_ADDR_TLS_SLEB: |
1100 | case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: |
1101 | if (!isValidDataSymbol(Index: Reloc.Index)) |
1102 | return badReloc("invalid data relocation"); |
1103 | Reloc.Addend = readVarint32(Ctx); |
1104 | break; |
1105 | case wasm::R_WASM_MEMORY_ADDR_LEB64: |
1106 | case wasm::R_WASM_MEMORY_ADDR_SLEB64: |
1107 | case wasm::R_WASM_MEMORY_ADDR_I64: |
1108 | case wasm::R_WASM_MEMORY_ADDR_REL_SLEB64: |
1109 | case wasm::R_WASM_MEMORY_ADDR_TLS_SLEB64: |
1110 | if (!isValidDataSymbol(Index: Reloc.Index)) |
1111 | return badReloc("invalid data relocation"); |
1112 | Reloc.Addend = readVarint64(Ctx); |
1113 | break; |
1114 | case wasm::R_WASM_FUNCTION_OFFSET_I32: |
1115 | if (!isValidFunctionSymbol(Index: Reloc.Index)) |
1116 | return badReloc("invalid function relocation"); |
1117 | Reloc.Addend = readVarint32(Ctx); |
1118 | break; |
1119 | case wasm::R_WASM_FUNCTION_OFFSET_I64: |
1120 | if (!isValidFunctionSymbol(Index: Reloc.Index)) |
1121 | return badReloc("invalid function relocation"); |
1122 | Reloc.Addend = readVarint64(Ctx); |
1123 | break; |
1124 | case wasm::R_WASM_SECTION_OFFSET_I32: |
1125 | if (!isValidSectionSymbol(Index: Reloc.Index)) |
1126 | return badReloc("invalid section relocation"); |
1127 | Reloc.Addend = readVarint32(Ctx); |
1128 | break; |
1129 | default: |
1130 | return make_error<GenericBinaryError>(Args: "invalid relocation type: "+ |
1131 | Twine(type), |
1132 | Args: object_error::parse_failed); |
1133 | } |
1134 | |
1135 | // Relocations must fit inside the section, and must appear in order. They |
1136 | // also shouldn't overlap a function/element boundary, but we don't bother |
1137 | // to check that. |
1138 | uint64_t Size = 5; |
1139 | if (Reloc.Type == wasm::R_WASM_MEMORY_ADDR_LEB64 || |
1140 | Reloc.Type == wasm::R_WASM_MEMORY_ADDR_SLEB64 || |
1141 | Reloc.Type == wasm::R_WASM_MEMORY_ADDR_REL_SLEB64) |
1142 | Size = 10; |
1143 | if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I32 || |
1144 | Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I32 || |
1145 | Reloc.Type == wasm::R_WASM_MEMORY_ADDR_LOCREL_I32 || |
1146 | Reloc.Type == wasm::R_WASM_SECTION_OFFSET_I32 || |
1147 | Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I32 || |
1148 | Reloc.Type == wasm::R_WASM_FUNCTION_INDEX_I32 || |
1149 | Reloc.Type == wasm::R_WASM_GLOBAL_INDEX_I32) |
1150 | Size = 4; |
1151 | if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I64 || |
1152 | Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I64 || |
1153 | Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I64) |
1154 | Size = 8; |
1155 | if (Reloc.Offset + Size > EndOffset) |
1156 | return make_error<GenericBinaryError>(Args: "invalid relocation offset", |
1157 | Args: object_error::parse_failed); |
1158 | |
1159 | Section.Relocations.push_back(x: Reloc); |
1160 | } |
1161 | if (Ctx.Ptr != Ctx.End) |
1162 | return make_error<GenericBinaryError>(Args: "reloc section ended prematurely", |
1163 | Args: object_error::parse_failed); |
1164 | return Error::success(); |
1165 | } |
1166 | |
1167 | Error WasmObjectFile::parseCustomSection(WasmSection &Sec, ReadContext &Ctx) { |
1168 | if (Sec.Name == "dylink") { |
1169 | if (Error Err = parseDylinkSection(Ctx)) |
1170 | return Err; |
1171 | } else if (Sec.Name == "dylink.0") { |
1172 | if (Error Err = parseDylink0Section(Ctx)) |
1173 | return Err; |
1174 | } else if (Sec.Name == "name") { |
1175 | if (Error Err = parseNameSection(Ctx)) |
1176 | return Err; |
1177 | } else if (Sec.Name == "linking") { |
1178 | if (Error Err = parseLinkingSection(Ctx)) |
1179 | return Err; |
1180 | } else if (Sec.Name == "producers") { |
1181 | if (Error Err = parseProducersSection(Ctx)) |
1182 | return Err; |
1183 | } else if (Sec.Name == "target_features") { |
1184 | if (Error Err = parseTargetFeaturesSection(Ctx)) |
1185 | return Err; |
1186 | } else if (Sec.Name.starts_with(Prefix: "reloc.")) { |
1187 | if (Error Err = parseRelocSection(Name: Sec.Name, Ctx)) |
1188 | return Err; |
1189 | } |
1190 | return Error::success(); |
1191 | } |
1192 | |
1193 | Error WasmObjectFile::parseTypeSection(ReadContext &Ctx) { |
1194 | auto parseFieldDef = [&]() { |
1195 | uint32_t TypeCode = readVaruint32((Ctx)); |
1196 | /* Discard StorageType */ parseValType(Ctx, Code: TypeCode); |
1197 | /* Discard Mutability */ readVaruint32(Ctx); |
1198 | }; |
1199 | |
1200 | uint32_t Count = readVaruint32(Ctx); |
1201 | Signatures.reserve(n: Count); |
1202 | while (Count--) { |
1203 | wasm::WasmSignature Sig; |
1204 | uint8_t Form = readUint8(Ctx); |
1205 | if (Form == wasm::WASM_TYPE_REC) { |
1206 | // Rec groups expand the type index space (beyond what was declared at |
1207 | // the top of the section, and also consume one element in that space. |
1208 | uint32_t RecSize = readVaruint32(Ctx); |
1209 | if (RecSize == 0) |
1210 | return make_error<GenericBinaryError>(Args: "Rec group size cannot be 0", |
1211 | Args: object_error::parse_failed); |
1212 | Signatures.reserve(n: Signatures.size() + RecSize); |
1213 | Count += RecSize; |
1214 | Sig.Kind = wasm::WasmSignature::Placeholder; |
1215 | Signatures.push_back(x: std::move(Sig)); |
1216 | HasUnmodeledTypes = true; |
1217 | continue; |
1218 | } |
1219 | if (Form != wasm::WASM_TYPE_FUNC) { |
1220 | // Currently LLVM only models function types, and not other composite |
1221 | // types. Here we parse the type declarations just enough to skip past |
1222 | // them in the binary. |
1223 | if (Form == wasm::WASM_TYPE_SUB || Form == wasm::WASM_TYPE_SUB_FINAL) { |
1224 | uint32_t Supers = readVaruint32(Ctx); |
1225 | if (Supers > 0) { |
1226 | if (Supers != 1) |
1227 | return make_error<GenericBinaryError>( |
1228 | Args: "Invalid number of supertypes", Args: object_error::parse_failed); |
1229 | /* Discard SuperIndex */ readVaruint32(Ctx); |
1230 | } |
1231 | Form = readVaruint32(Ctx); |
1232 | } |
1233 | if (Form == wasm::WASM_TYPE_STRUCT) { |
1234 | uint32_t FieldCount = readVaruint32(Ctx); |
1235 | while (FieldCount--) { |
1236 | parseFieldDef(); |
1237 | } |
1238 | } else if (Form == wasm::WASM_TYPE_ARRAY) { |
1239 | parseFieldDef(); |
1240 | } else { |
1241 | return make_error<GenericBinaryError>(Args: "bad form", |
1242 | Args: object_error::parse_failed); |
1243 | } |
1244 | Sig.Kind = wasm::WasmSignature::Placeholder; |
1245 | Signatures.push_back(x: std::move(Sig)); |
1246 | HasUnmodeledTypes = true; |
1247 | continue; |
1248 | } |
1249 | |
1250 | uint32_t ParamCount = readVaruint32(Ctx); |
1251 | Sig.Params.reserve(N: ParamCount); |
1252 | while (ParamCount--) { |
1253 | uint32_t ParamType = readUint8(Ctx); |
1254 | Sig.Params.push_back(Elt: parseValType(Ctx, Code: ParamType)); |
1255 | } |
1256 | uint32_t ReturnCount = readVaruint32(Ctx); |
1257 | while (ReturnCount--) { |
1258 | uint32_t ReturnType = readUint8(Ctx); |
1259 | Sig.Returns.push_back(Elt: parseValType(Ctx, Code: ReturnType)); |
1260 | } |
1261 | |
1262 | Signatures.push_back(x: std::move(Sig)); |
1263 | } |
1264 | if (Ctx.Ptr != Ctx.End) |
1265 | return make_error<GenericBinaryError>(Args: "type section ended prematurely", |
1266 | Args: object_error::parse_failed); |
1267 | return Error::success(); |
1268 | } |
1269 | |
1270 | Error WasmObjectFile::parseImportSection(ReadContext &Ctx) { |
1271 | uint32_t Count = readVaruint32(Ctx); |
1272 | uint32_t NumTypes = Signatures.size(); |
1273 | Imports.reserve(n: Count); |
1274 | for (uint32_t I = 0; I < Count; I++) { |
1275 | wasm::WasmImport Im; |
1276 | Im.Module = readString(Ctx); |
1277 | Im.Field = readString(Ctx); |
1278 | Im.Kind = readUint8(Ctx); |
1279 | switch (Im.Kind) { |
1280 | case wasm::WASM_EXTERNAL_FUNCTION: |
1281 | NumImportedFunctions++; |
1282 | Im.SigIndex = readVaruint32(Ctx); |
1283 | if (Im.SigIndex >= NumTypes) |
1284 | return make_error<GenericBinaryError>(Args: "invalid function type", |
1285 | Args: object_error::parse_failed); |
1286 | break; |
1287 | case wasm::WASM_EXTERNAL_GLOBAL: |
1288 | NumImportedGlobals++; |
1289 | Im.Global.Type = readUint8(Ctx); |
1290 | Im.Global.Mutable = readVaruint1(Ctx); |
1291 | break; |
1292 | case wasm::WASM_EXTERNAL_MEMORY: |
1293 | Im.Memory = readLimits(Ctx); |
1294 | if (Im.Memory.Flags & wasm::WASM_LIMITS_FLAG_IS_64) |
1295 | HasMemory64 = true; |
1296 | break; |
1297 | case wasm::WASM_EXTERNAL_TABLE: { |
1298 | Im.Table = readTableType(Ctx); |
1299 | NumImportedTables++; |
1300 | auto ElemType = Im.Table.ElemType; |
1301 | if (ElemType != wasm::ValType::FUNCREF && |
1302 | ElemType != wasm::ValType::EXTERNREF && |
1303 | ElemType != wasm::ValType::EXNREF && |
1304 | ElemType != wasm::ValType::OTHERREF) |
1305 | return make_error<GenericBinaryError>(Args: "invalid table element type", |
1306 | Args: object_error::parse_failed); |
1307 | break; |
1308 | } |
1309 | case wasm::WASM_EXTERNAL_TAG: |
1310 | NumImportedTags++; |
1311 | if (readUint8(Ctx) != 0) // Reserved 'attribute' field |
1312 | return make_error<GenericBinaryError>(Args: "invalid attribute", |
1313 | Args: object_error::parse_failed); |
1314 | Im.SigIndex = readVaruint32(Ctx); |
1315 | if (Im.SigIndex >= NumTypes) |
1316 | return make_error<GenericBinaryError>(Args: "invalid tag type", |
1317 | Args: object_error::parse_failed); |
1318 | break; |
1319 | default: |
1320 | return make_error<GenericBinaryError>(Args: "unexpected import kind", |
1321 | Args: object_error::parse_failed); |
1322 | } |
1323 | Imports.push_back(x: Im); |
1324 | } |
1325 | if (Ctx.Ptr != Ctx.End) |
1326 | return make_error<GenericBinaryError>(Args: "import section ended prematurely", |
1327 | Args: object_error::parse_failed); |
1328 | return Error::success(); |
1329 | } |
1330 | |
1331 | Error WasmObjectFile::parseFunctionSection(ReadContext &Ctx) { |
1332 | uint32_t Count = readVaruint32(Ctx); |
1333 | Functions.reserve(n: Count); |
1334 | uint32_t NumTypes = Signatures.size(); |
1335 | while (Count--) { |
1336 | uint32_t Type = readVaruint32(Ctx); |
1337 | if (Type >= NumTypes) |
1338 | return make_error<GenericBinaryError>(Args: "invalid function type", |
1339 | Args: object_error::parse_failed); |
1340 | wasm::WasmFunction F; |
1341 | F.SigIndex = Type; |
1342 | Functions.push_back(x: F); |
1343 | } |
1344 | if (Ctx.Ptr != Ctx.End) |
1345 | return make_error<GenericBinaryError>(Args: "function section ended prematurely", |
1346 | Args: object_error::parse_failed); |
1347 | return Error::success(); |
1348 | } |
1349 | |
1350 | Error WasmObjectFile::parseTableSection(ReadContext &Ctx) { |
1351 | TableSection = Sections.size(); |
1352 | uint32_t Count = readVaruint32(Ctx); |
1353 | Tables.reserve(n: Count); |
1354 | while (Count--) { |
1355 | wasm::WasmTable T; |
1356 | T.Type = readTableType(Ctx); |
1357 | T.Index = NumImportedTables + Tables.size(); |
1358 | Tables.push_back(x: T); |
1359 | auto ElemType = Tables.back().Type.ElemType; |
1360 | if (ElemType != wasm::ValType::FUNCREF && |
1361 | ElemType != wasm::ValType::EXTERNREF && |
1362 | ElemType != wasm::ValType::EXNREF && |
1363 | ElemType != wasm::ValType::OTHERREF) { |
1364 | return make_error<GenericBinaryError>(Args: "invalid table element type", |
1365 | Args: object_error::parse_failed); |
1366 | } |
1367 | } |
1368 | if (Ctx.Ptr != Ctx.End) |
1369 | return make_error<GenericBinaryError>(Args: "table section ended prematurely", |
1370 | Args: object_error::parse_failed); |
1371 | return Error::success(); |
1372 | } |
1373 | |
1374 | Error WasmObjectFile::parseMemorySection(ReadContext &Ctx) { |
1375 | uint32_t Count = readVaruint32(Ctx); |
1376 | Memories.reserve(n: Count); |
1377 | while (Count--) { |
1378 | auto Limits = readLimits(Ctx); |
1379 | if (Limits.Flags & wasm::WASM_LIMITS_FLAG_IS_64) |
1380 | HasMemory64 = true; |
1381 | Memories.push_back(x: Limits); |
1382 | } |
1383 | if (Ctx.Ptr != Ctx.End) |
1384 | return make_error<GenericBinaryError>(Args: "memory section ended prematurely", |
1385 | Args: object_error::parse_failed); |
1386 | return Error::success(); |
1387 | } |
1388 | |
1389 | Error WasmObjectFile::parseTagSection(ReadContext &Ctx) { |
1390 | TagSection = Sections.size(); |
1391 | uint32_t Count = readVaruint32(Ctx); |
1392 | Tags.reserve(n: Count); |
1393 | uint32_t NumTypes = Signatures.size(); |
1394 | while (Count--) { |
1395 | if (readUint8(Ctx) != 0) // Reserved 'attribute' field |
1396 | return make_error<GenericBinaryError>(Args: "invalid attribute", |
1397 | Args: object_error::parse_failed); |
1398 | uint32_t Type = readVaruint32(Ctx); |
1399 | if (Type >= NumTypes) |
1400 | return make_error<GenericBinaryError>(Args: "invalid tag type", |
1401 | Args: object_error::parse_failed); |
1402 | wasm::WasmTag Tag; |
1403 | Tag.Index = NumImportedTags + Tags.size(); |
1404 | Tag.SigIndex = Type; |
1405 | Signatures[Type].Kind = wasm::WasmSignature::Tag; |
1406 | Tags.push_back(x: Tag); |
1407 | } |
1408 | |
1409 | if (Ctx.Ptr != Ctx.End) |
1410 | return make_error<GenericBinaryError>(Args: "tag section ended prematurely", |
1411 | Args: object_error::parse_failed); |
1412 | return Error::success(); |
1413 | } |
1414 | |
1415 | Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) { |
1416 | GlobalSection = Sections.size(); |
1417 | const uint8_t *SectionStart = Ctx.Ptr; |
1418 | uint32_t Count = readVaruint32(Ctx); |
1419 | Globals.reserve(n: Count); |
1420 | while (Count--) { |
1421 | wasm::WasmGlobal Global; |
1422 | Global.Index = NumImportedGlobals + Globals.size(); |
1423 | const uint8_t *GlobalStart = Ctx.Ptr; |
1424 | Global.Offset = static_cast<uint32_t>(GlobalStart - SectionStart); |
1425 | auto GlobalOpcode = readVaruint32(Ctx); |
1426 | Global.Type.Type = (uint8_t)parseValType(Ctx, Code: GlobalOpcode); |
1427 | Global.Type.Mutable = readVaruint1(Ctx); |
1428 | if (Error Err = readInitExpr(Expr&: Global.InitExpr, Ctx)) |
1429 | return Err; |
1430 | Global.Size = static_cast<uint32_t>(Ctx.Ptr - GlobalStart); |
1431 | Globals.push_back(x: Global); |
1432 | } |
1433 | if (Ctx.Ptr != Ctx.End) |
1434 | return make_error<GenericBinaryError>(Args: "global section ended prematurely", |
1435 | Args: object_error::parse_failed); |
1436 | return Error::success(); |
1437 | } |
1438 | |
1439 | Error WasmObjectFile::parseExportSection(ReadContext &Ctx) { |
1440 | uint32_t Count = readVaruint32(Ctx); |
1441 | Exports.reserve(n: Count); |
1442 | Symbols.reserve(n: Count); |
1443 | for (uint32_t I = 0; I < Count; I++) { |
1444 | wasm::WasmExport Ex; |
1445 | Ex.Name = readString(Ctx); |
1446 | Ex.Kind = readUint8(Ctx); |
1447 | Ex.Index = readVaruint32(Ctx); |
1448 | const wasm::WasmSignature *Signature = nullptr; |
1449 | const wasm::WasmGlobalType *GlobalType = nullptr; |
1450 | const wasm::WasmTableType *TableType = nullptr; |
1451 | wasm::WasmSymbolInfo Info; |
1452 | Info.Name = Ex.Name; |
1453 | Info.Flags = 0; |
1454 | switch (Ex.Kind) { |
1455 | case wasm::WASM_EXTERNAL_FUNCTION: { |
1456 | if (!isValidFunctionIndex(Index: Ex.Index)) |
1457 | return make_error<GenericBinaryError>(Args: "invalid function export", |
1458 | Args: object_error::parse_failed); |
1459 | Info.Kind = wasm::WASM_SYMBOL_TYPE_FUNCTION; |
1460 | Info.ElementIndex = Ex.Index; |
1461 | if (isDefinedFunctionIndex(Index: Ex.Index)) { |
1462 | getDefinedFunction(Index: Ex.Index).ExportName = Ex.Name; |
1463 | unsigned FuncIndex = Info.ElementIndex - NumImportedFunctions; |
1464 | wasm::WasmFunction &Function = Functions[FuncIndex]; |
1465 | Signature = &Signatures[Function.SigIndex]; |
1466 | } |
1467 | // Else the function is imported. LLVM object files don't use this |
1468 | // pattern and we still treat this as an undefined symbol, but we want to |
1469 | // parse it without crashing. |
1470 | break; |
1471 | } |
1472 | case wasm::WASM_EXTERNAL_GLOBAL: { |
1473 | if (!isValidGlobalIndex(Index: Ex.Index)) |
1474 | return make_error<GenericBinaryError>(Args: "invalid global export", |
1475 | Args: object_error::parse_failed); |
1476 | Info.Kind = wasm::WASM_SYMBOL_TYPE_DATA; |
1477 | uint64_t Offset = 0; |
1478 | if (isDefinedGlobalIndex(Index: Ex.Index)) { |
1479 | auto Global = getDefinedGlobal(Index: Ex.Index); |
1480 | if (!Global.InitExpr.Extended) { |
1481 | auto Inst = Global.InitExpr.Inst; |
1482 | if (Inst.Opcode == wasm::WASM_OPCODE_I32_CONST) { |
1483 | Offset = Inst.Value.Int32; |
1484 | } else if (Inst.Opcode == wasm::WASM_OPCODE_I64_CONST) { |
1485 | Offset = Inst.Value.Int64; |
1486 | } |
1487 | } |
1488 | } |
1489 | Info.DataRef = wasm::WasmDataReference{.Segment: 0, .Offset: Offset, .Size: 0}; |
1490 | break; |
1491 | } |
1492 | case wasm::WASM_EXTERNAL_TAG: |
1493 | if (!isValidTagIndex(Index: Ex.Index)) |
1494 | return make_error<GenericBinaryError>(Args: "invalid tag export", |
1495 | Args: object_error::parse_failed); |
1496 | Info.Kind = wasm::WASM_SYMBOL_TYPE_TAG; |
1497 | Info.ElementIndex = Ex.Index; |
1498 | break; |
1499 | case wasm::WASM_EXTERNAL_MEMORY: |
1500 | break; |
1501 | case wasm::WASM_EXTERNAL_TABLE: |
1502 | Info.Kind = wasm::WASM_SYMBOL_TYPE_TABLE; |
1503 | Info.ElementIndex = Ex.Index; |
1504 | break; |
1505 | default: |
1506 | return make_error<GenericBinaryError>(Args: "unexpected export kind", |
1507 | Args: object_error::parse_failed); |
1508 | } |
1509 | Exports.push_back(x: Ex); |
1510 | if (Ex.Kind != wasm::WASM_EXTERNAL_MEMORY) { |
1511 | Symbols.emplace_back(args&: Info, args&: GlobalType, args&: TableType, args&: Signature); |
1512 | LLVM_DEBUG(dbgs() << "Adding symbol: "<< Symbols.back() << "\n"); |
1513 | } |
1514 | } |
1515 | if (Ctx.Ptr != Ctx.End) |
1516 | return make_error<GenericBinaryError>(Args: "export section ended prematurely", |
1517 | Args: object_error::parse_failed); |
1518 | return Error::success(); |
1519 | } |
1520 | |
1521 | bool WasmObjectFile::isValidFunctionIndex(uint32_t Index) const { |
1522 | return Index < NumImportedFunctions + Functions.size(); |
1523 | } |
1524 | |
1525 | bool WasmObjectFile::isDefinedFunctionIndex(uint32_t Index) const { |
1526 | return Index >= NumImportedFunctions && isValidFunctionIndex(Index); |
1527 | } |
1528 | |
1529 | bool WasmObjectFile::isValidGlobalIndex(uint32_t Index) const { |
1530 | return Index < NumImportedGlobals + Globals.size(); |
1531 | } |
1532 | |
1533 | bool WasmObjectFile::isValidTableNumber(uint32_t Index) const { |
1534 | return Index < NumImportedTables + Tables.size(); |
1535 | } |
1536 | |
1537 | bool WasmObjectFile::isDefinedGlobalIndex(uint32_t Index) const { |
1538 | return Index >= NumImportedGlobals && isValidGlobalIndex(Index); |
1539 | } |
1540 | |
1541 | bool WasmObjectFile::isDefinedTableNumber(uint32_t Index) const { |
1542 | return Index >= NumImportedTables && isValidTableNumber(Index); |
1543 | } |
1544 | |
1545 | bool WasmObjectFile::isValidTagIndex(uint32_t Index) const { |
1546 | return Index < NumImportedTags + Tags.size(); |
1547 | } |
1548 | |
1549 | bool WasmObjectFile::isDefinedTagIndex(uint32_t Index) const { |
1550 | return Index >= NumImportedTags && isValidTagIndex(Index); |
1551 | } |
1552 | |
1553 | bool WasmObjectFile::isValidFunctionSymbol(uint32_t Index) const { |
1554 | return Index < Symbols.size() && Symbols[Index].isTypeFunction(); |
1555 | } |
1556 | |
1557 | bool WasmObjectFile::isValidTableSymbol(uint32_t Index) const { |
1558 | return Index < Symbols.size() && Symbols[Index].isTypeTable(); |
1559 | } |
1560 | |
1561 | bool WasmObjectFile::isValidGlobalSymbol(uint32_t Index) const { |
1562 | return Index < Symbols.size() && Symbols[Index].isTypeGlobal(); |
1563 | } |
1564 | |
1565 | bool WasmObjectFile::isValidTagSymbol(uint32_t Index) const { |
1566 | return Index < Symbols.size() && Symbols[Index].isTypeTag(); |
1567 | } |
1568 | |
1569 | bool WasmObjectFile::isValidDataSymbol(uint32_t Index) const { |
1570 | return Index < Symbols.size() && Symbols[Index].isTypeData(); |
1571 | } |
1572 | |
1573 | bool WasmObjectFile::isValidSectionSymbol(uint32_t Index) const { |
1574 | return Index < Symbols.size() && Symbols[Index].isTypeSection(); |
1575 | } |
1576 | |
1577 | wasm::WasmFunction &WasmObjectFile::getDefinedFunction(uint32_t Index) { |
1578 | assert(isDefinedFunctionIndex(Index)); |
1579 | return Functions[Index - NumImportedFunctions]; |
1580 | } |
1581 | |
1582 | const wasm::WasmFunction & |
1583 | WasmObjectFile::getDefinedFunction(uint32_t Index) const { |
1584 | assert(isDefinedFunctionIndex(Index)); |
1585 | return Functions[Index - NumImportedFunctions]; |
1586 | } |
1587 | |
1588 | const wasm::WasmGlobal &WasmObjectFile::getDefinedGlobal(uint32_t Index) const { |
1589 | assert(isDefinedGlobalIndex(Index)); |
1590 | return Globals[Index - NumImportedGlobals]; |
1591 | } |
1592 | |
1593 | wasm::WasmTag &WasmObjectFile::getDefinedTag(uint32_t Index) { |
1594 | assert(isDefinedTagIndex(Index)); |
1595 | return Tags[Index - NumImportedTags]; |
1596 | } |
1597 | |
1598 | Error WasmObjectFile::parseStartSection(ReadContext &Ctx) { |
1599 | StartFunction = readVaruint32(Ctx); |
1600 | if (!isValidFunctionIndex(Index: StartFunction)) |
1601 | return make_error<GenericBinaryError>(Args: "invalid start function", |
1602 | Args: object_error::parse_failed); |
1603 | return Error::success(); |
1604 | } |
1605 | |
1606 | Error WasmObjectFile::parseCodeSection(ReadContext &Ctx) { |
1607 | CodeSection = Sections.size(); |
1608 | uint32_t FunctionCount = readVaruint32(Ctx); |
1609 | if (FunctionCount != Functions.size()) { |
1610 | return make_error<GenericBinaryError>(Args: "invalid function count", |
1611 | Args: object_error::parse_failed); |
1612 | } |
1613 | |
1614 | for (uint32_t i = 0; i < FunctionCount; i++) { |
1615 | wasm::WasmFunction& Function = Functions[i]; |
1616 | const uint8_t *FunctionStart = Ctx.Ptr; |
1617 | uint32_t Size = readVaruint32(Ctx); |
1618 | const uint8_t *FunctionEnd = Ctx.Ptr + Size; |
1619 | |
1620 | Function.CodeOffset = Ctx.Ptr - FunctionStart; |
1621 | Function.Index = NumImportedFunctions + i; |
1622 | Function.CodeSectionOffset = FunctionStart - Ctx.Start; |
1623 | Function.Size = FunctionEnd - FunctionStart; |
1624 | |
1625 | uint32_t NumLocalDecls = readVaruint32(Ctx); |
1626 | Function.Locals.reserve(n: NumLocalDecls); |
1627 | while (NumLocalDecls--) { |
1628 | wasm::WasmLocalDecl Decl; |
1629 | Decl.Count = readVaruint32(Ctx); |
1630 | Decl.Type = readUint8(Ctx); |
1631 | Function.Locals.push_back(x: Decl); |
1632 | } |
1633 | |
1634 | uint32_t BodySize = FunctionEnd - Ctx.Ptr; |
1635 | // Ensure that Function is within Ctx's buffer. |
1636 | if (Ctx.Ptr + BodySize > Ctx.End) { |
1637 | return make_error<GenericBinaryError>(Args: "Function extends beyond buffer", |
1638 | Args: object_error::parse_failed); |
1639 | } |
1640 | Function.Body = ArrayRef<uint8_t>(Ctx.Ptr, BodySize); |
1641 | // This will be set later when reading in the linking metadata section. |
1642 | Function.Comdat = UINT32_MAX; |
1643 | Ctx.Ptr += BodySize; |
1644 | assert(Ctx.Ptr == FunctionEnd); |
1645 | } |
1646 | if (Ctx.Ptr != Ctx.End) |
1647 | return make_error<GenericBinaryError>(Args: "code section ended prematurely", |
1648 | Args: object_error::parse_failed); |
1649 | return Error::success(); |
1650 | } |
1651 | |
1652 | Error WasmObjectFile::parseElemSection(ReadContext &Ctx) { |
1653 | uint32_t Count = readVaruint32(Ctx); |
1654 | ElemSegments.reserve(n: Count); |
1655 | while (Count--) { |
1656 | wasm::WasmElemSegment Segment; |
1657 | Segment.Flags = readVaruint32(Ctx); |
1658 | |
1659 | uint32_t SupportedFlags = wasm::WASM_ELEM_SEGMENT_HAS_TABLE_NUMBER | |
1660 | wasm::WASM_ELEM_SEGMENT_IS_PASSIVE | |
1661 | wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS; |
1662 | if (Segment.Flags & ~SupportedFlags) |
1663 | return make_error<GenericBinaryError>( |
1664 | Args: "Unsupported flags for element segment", Args: object_error::parse_failed); |
1665 | |
1666 | wasm::ElemSegmentMode Mode; |
1667 | if ((Segment.Flags & wasm::WASM_ELEM_SEGMENT_IS_PASSIVE) == 0) { |
1668 | Mode = wasm::ElemSegmentMode::Active; |
1669 | } else if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_IS_DECLARATIVE) { |
1670 | Mode = wasm::ElemSegmentMode::Declarative; |
1671 | } else { |
1672 | Mode = wasm::ElemSegmentMode::Passive; |
1673 | } |
1674 | bool HasTableNumber = |
1675 | Mode == wasm::ElemSegmentMode::Active && |
1676 | (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_TABLE_NUMBER); |
1677 | bool HasElemKind = |
1678 | (Segment.Flags & wasm::WASM_ELEM_SEGMENT_MASK_HAS_ELEM_DESC) && |
1679 | !(Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS); |
1680 | bool HasElemType = |
1681 | (Segment.Flags & wasm::WASM_ELEM_SEGMENT_MASK_HAS_ELEM_DESC) && |
1682 | (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS); |
1683 | bool HasInitExprs = |
1684 | (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS); |
1685 | |
1686 | if (HasTableNumber) |
1687 | Segment.TableNumber = readVaruint32(Ctx); |
1688 | else |
1689 | Segment.TableNumber = 0; |
1690 | |
1691 | if (!isValidTableNumber(Index: Segment.TableNumber)) |
1692 | return make_error<GenericBinaryError>(Args: "invalid TableNumber", |
1693 | Args: object_error::parse_failed); |
1694 | |
1695 | if (Mode != wasm::ElemSegmentMode::Active) { |
1696 | Segment.Offset.Extended = false; |
1697 | Segment.Offset.Inst.Opcode = wasm::WASM_OPCODE_I32_CONST; |
1698 | Segment.Offset.Inst.Value.Int32 = 0; |
1699 | } else { |
1700 | if (Error Err = readInitExpr(Expr&: Segment.Offset, Ctx)) |
1701 | return Err; |
1702 | } |
1703 | |
1704 | if (HasElemKind) { |
1705 | auto ElemKind = readVaruint32(Ctx); |
1706 | if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS) { |
1707 | Segment.ElemKind = parseValType(Ctx, Code: ElemKind); |
1708 | if (Segment.ElemKind != wasm::ValType::FUNCREF && |
1709 | Segment.ElemKind != wasm::ValType::EXTERNREF && |
1710 | Segment.ElemKind != wasm::ValType::EXNREF && |
1711 | Segment.ElemKind != wasm::ValType::OTHERREF) { |
1712 | return make_error<GenericBinaryError>(Args: "invalid elem type", |
1713 | Args: object_error::parse_failed); |
1714 | } |
1715 | } else { |
1716 | if (ElemKind != 0) |
1717 | return make_error<GenericBinaryError>(Args: "invalid elem type", |
1718 | Args: object_error::parse_failed); |
1719 | Segment.ElemKind = wasm::ValType::FUNCREF; |
1720 | } |
1721 | } else if (HasElemType) { |
1722 | auto ElemType = parseValType(Ctx, Code: readVaruint32(Ctx)); |
1723 | Segment.ElemKind = ElemType; |
1724 | } else { |
1725 | Segment.ElemKind = wasm::ValType::FUNCREF; |
1726 | } |
1727 | |
1728 | uint32_t NumElems = readVaruint32(Ctx); |
1729 | |
1730 | if (HasInitExprs) { |
1731 | while (NumElems--) { |
1732 | wasm::WasmInitExpr Expr; |
1733 | if (Error Err = readInitExpr(Expr, Ctx)) |
1734 | return Err; |
1735 | } |
1736 | } else { |
1737 | while (NumElems--) { |
1738 | Segment.Functions.push_back(x: readVaruint32(Ctx)); |
1739 | } |
1740 | } |
1741 | ElemSegments.push_back(x: Segment); |
1742 | } |
1743 | if (Ctx.Ptr != Ctx.End) |
1744 | return make_error<GenericBinaryError>(Args: "elem section ended prematurely", |
1745 | Args: object_error::parse_failed); |
1746 | return Error::success(); |
1747 | } |
1748 | |
1749 | Error WasmObjectFile::parseDataSection(ReadContext &Ctx) { |
1750 | DataSection = Sections.size(); |
1751 | uint32_t Count = readVaruint32(Ctx); |
1752 | if (DataCount && Count != *DataCount) |
1753 | return make_error<GenericBinaryError>( |
1754 | Args: "number of data segments does not match DataCount section"); |
1755 | DataSegments.reserve(n: Count); |
1756 | while (Count--) { |
1757 | WasmSegment Segment; |
1758 | Segment.Data.InitFlags = readVaruint32(Ctx); |
1759 | Segment.Data.MemoryIndex = |
1760 | (Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_HAS_MEMINDEX) |
1761 | ? readVaruint32(Ctx) |
1762 | : 0; |
1763 | if ((Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_IS_PASSIVE) == 0) { |
1764 | if (Error Err = readInitExpr(Expr&: Segment.Data.Offset, Ctx)) |
1765 | return Err; |
1766 | } else { |
1767 | Segment.Data.Offset.Extended = false; |
1768 | Segment.Data.Offset.Inst.Opcode = wasm::WASM_OPCODE_I32_CONST; |
1769 | Segment.Data.Offset.Inst.Value.Int32 = 0; |
1770 | } |
1771 | uint32_t Size = readVaruint32(Ctx); |
1772 | if (Size > (size_t)(Ctx.End - Ctx.Ptr)) |
1773 | return make_error<GenericBinaryError>(Args: "invalid segment size", |
1774 | Args: object_error::parse_failed); |
1775 | Segment.Data.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); |
1776 | // The rest of these Data fields are set later, when reading in the linking |
1777 | // metadata section. |
1778 | Segment.Data.Alignment = 0; |
1779 | Segment.Data.LinkingFlags = 0; |
1780 | Segment.Data.Comdat = UINT32_MAX; |
1781 | Segment.SectionOffset = Ctx.Ptr - Ctx.Start; |
1782 | Ctx.Ptr += Size; |
1783 | DataSegments.push_back(x: Segment); |
1784 | } |
1785 | if (Ctx.Ptr != Ctx.End) |
1786 | return make_error<GenericBinaryError>(Args: "data section ended prematurely", |
1787 | Args: object_error::parse_failed); |
1788 | return Error::success(); |
1789 | } |
1790 | |
1791 | Error WasmObjectFile::parseDataCountSection(ReadContext &Ctx) { |
1792 | DataCount = readVaruint32(Ctx); |
1793 | return Error::success(); |
1794 | } |
1795 | |
1796 | const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const { |
1797 | return Header; |
1798 | } |
1799 | |
1800 | void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.b++; } |
1801 | |
1802 | Expected<uint32_t> WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const { |
1803 | uint32_t Result = SymbolRef::SF_None; |
1804 | const WasmSymbol &Sym = getWasmSymbol(Symb); |
1805 | |
1806 | LLVM_DEBUG(dbgs() << "getSymbolFlags: ptr="<< &Sym << " "<< Sym << "\n"); |
1807 | if (Sym.isBindingWeak()) |
1808 | Result |= SymbolRef::SF_Weak; |
1809 | if (!Sym.isBindingLocal()) |
1810 | Result |= SymbolRef::SF_Global; |
1811 | if (Sym.isHidden()) |
1812 | Result |= SymbolRef::SF_Hidden; |
1813 | if (!Sym.isDefined()) |
1814 | Result |= SymbolRef::SF_Undefined; |
1815 | if (Sym.isTypeFunction()) |
1816 | Result |= SymbolRef::SF_Executable; |
1817 | return Result; |
1818 | } |
1819 | |
1820 | basic_symbol_iterator WasmObjectFile::symbol_begin() const { |
1821 | DataRefImpl Ref; |
1822 | Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null |
1823 | Ref.d.b = 0; // Symbol index |
1824 | return BasicSymbolRef(Ref, this); |
1825 | } |
1826 | |
1827 | basic_symbol_iterator WasmObjectFile::symbol_end() const { |
1828 | DataRefImpl Ref; |
1829 | Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null |
1830 | Ref.d.b = Symbols.size(); // Symbol index |
1831 | return BasicSymbolRef(Ref, this); |
1832 | } |
1833 | |
1834 | const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const { |
1835 | return Symbols[Symb.d.b]; |
1836 | } |
1837 | |
1838 | const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const { |
1839 | return getWasmSymbol(Symb: Symb.getRawDataRefImpl()); |
1840 | } |
1841 | |
1842 | Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const { |
1843 | return getWasmSymbol(Symb).Info.Name; |
1844 | } |
1845 | |
1846 | Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const { |
1847 | auto &Sym = getWasmSymbol(Symb); |
1848 | if (!Sym.isDefined()) |
1849 | return 0; |
1850 | Expected<section_iterator> Sec = getSymbolSection(Symb); |
1851 | if (!Sec) |
1852 | return Sec.takeError(); |
1853 | uint32_t SectionAddress = getSectionAddress(Sec: Sec.get()->getRawDataRefImpl()); |
1854 | if (Sym.Info.Kind == wasm::WASM_SYMBOL_TYPE_FUNCTION && |
1855 | isDefinedFunctionIndex(Index: Sym.Info.ElementIndex)) { |
1856 | return getDefinedFunction(Index: Sym.Info.ElementIndex).CodeSectionOffset + |
1857 | SectionAddress; |
1858 | } |
1859 | if (Sym.Info.Kind == wasm::WASM_SYMBOL_TYPE_GLOBAL && |
1860 | isDefinedGlobalIndex(Index: Sym.Info.ElementIndex)) { |
1861 | return getDefinedGlobal(Index: Sym.Info.ElementIndex).Offset + SectionAddress; |
1862 | } |
1863 | |
1864 | return getSymbolValue(Symb); |
1865 | } |
1866 | |
1867 | uint64_t WasmObjectFile::getWasmSymbolValue(const WasmSymbol &Sym) const { |
1868 | switch (Sym.Info.Kind) { |
1869 | case wasm::WASM_SYMBOL_TYPE_FUNCTION: |
1870 | case wasm::WASM_SYMBOL_TYPE_GLOBAL: |
1871 | case wasm::WASM_SYMBOL_TYPE_TAG: |
1872 | case wasm::WASM_SYMBOL_TYPE_TABLE: |
1873 | return Sym.Info.ElementIndex; |
1874 | case wasm::WASM_SYMBOL_TYPE_DATA: { |
1875 | // The value of a data symbol is the segment offset, plus the symbol |
1876 | // offset within the segment. |
1877 | uint32_t SegmentIndex = Sym.Info.DataRef.Segment; |
1878 | const wasm::WasmDataSegment &Segment = DataSegments[SegmentIndex].Data; |
1879 | if (Segment.Offset.Extended) { |
1880 | llvm_unreachable("extended init exprs not supported"); |
1881 | } else if (Segment.Offset.Inst.Opcode == wasm::WASM_OPCODE_I32_CONST) { |
1882 | return Segment.Offset.Inst.Value.Int32 + Sym.Info.DataRef.Offset; |
1883 | } else if (Segment.Offset.Inst.Opcode == wasm::WASM_OPCODE_I64_CONST) { |
1884 | return Segment.Offset.Inst.Value.Int64 + Sym.Info.DataRef.Offset; |
1885 | } else if (Segment.Offset.Inst.Opcode == wasm::WASM_OPCODE_GLOBAL_GET) { |
1886 | return Sym.Info.DataRef.Offset; |
1887 | } else { |
1888 | llvm_unreachable("unknown init expr opcode"); |
1889 | } |
1890 | } |
1891 | case wasm::WASM_SYMBOL_TYPE_SECTION: |
1892 | return 0; |
1893 | } |
1894 | llvm_unreachable("invalid symbol type"); |
1895 | } |
1896 | |
1897 | uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const { |
1898 | return getWasmSymbolValue(Sym: getWasmSymbol(Symb)); |
1899 | } |
1900 | |
1901 | uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const { |
1902 | llvm_unreachable("not yet implemented"); |
1903 | return 0; |
1904 | } |
1905 | |
1906 | uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const { |
1907 | llvm_unreachable("not yet implemented"); |
1908 | return 0; |
1909 | } |
1910 | |
1911 | Expected<SymbolRef::Type> |
1912 | WasmObjectFile::getSymbolType(DataRefImpl Symb) const { |
1913 | const WasmSymbol &Sym = getWasmSymbol(Symb); |
1914 | |
1915 | switch (Sym.Info.Kind) { |
1916 | case wasm::WASM_SYMBOL_TYPE_FUNCTION: |
1917 | return SymbolRef::ST_Function; |
1918 | case wasm::WASM_SYMBOL_TYPE_GLOBAL: |
1919 | return SymbolRef::ST_Other; |
1920 | case wasm::WASM_SYMBOL_TYPE_DATA: |
1921 | return SymbolRef::ST_Data; |
1922 | case wasm::WASM_SYMBOL_TYPE_SECTION: |
1923 | return SymbolRef::ST_Debug; |
1924 | case wasm::WASM_SYMBOL_TYPE_TAG: |
1925 | return SymbolRef::ST_Other; |
1926 | case wasm::WASM_SYMBOL_TYPE_TABLE: |
1927 | return SymbolRef::ST_Other; |
1928 | } |
1929 | |
1930 | llvm_unreachable("unknown WasmSymbol::SymbolType"); |
1931 | return SymbolRef::ST_Other; |
1932 | } |
1933 | |
1934 | Expected<section_iterator> |
1935 | WasmObjectFile::getSymbolSection(DataRefImpl Symb) const { |
1936 | const WasmSymbol &Sym = getWasmSymbol(Symb); |
1937 | if (Sym.isUndefined()) |
1938 | return section_end(); |
1939 | |
1940 | DataRefImpl Ref; |
1941 | Ref.d.a = getSymbolSectionIdImpl(Symb: Sym); |
1942 | return section_iterator(SectionRef(Ref, this)); |
1943 | } |
1944 | |
1945 | uint32_t WasmObjectFile::getSymbolSectionId(SymbolRef Symb) const { |
1946 | const WasmSymbol &Sym = getWasmSymbol(Symb); |
1947 | return getSymbolSectionIdImpl(Symb: Sym); |
1948 | } |
1949 | |
1950 | uint32_t WasmObjectFile::getSymbolSectionIdImpl(const WasmSymbol &Sym) const { |
1951 | switch (Sym.Info.Kind) { |
1952 | case wasm::WASM_SYMBOL_TYPE_FUNCTION: |
1953 | return CodeSection; |
1954 | case wasm::WASM_SYMBOL_TYPE_GLOBAL: |
1955 | return GlobalSection; |
1956 | case wasm::WASM_SYMBOL_TYPE_DATA: |
1957 | return DataSection; |
1958 | case wasm::WASM_SYMBOL_TYPE_SECTION: |
1959 | return Sym.Info.ElementIndex; |
1960 | case wasm::WASM_SYMBOL_TYPE_TAG: |
1961 | return TagSection; |
1962 | case wasm::WASM_SYMBOL_TYPE_TABLE: |
1963 | return TableSection; |
1964 | default: |
1965 | llvm_unreachable("unknown WasmSymbol::SymbolType"); |
1966 | } |
1967 | } |
1968 | |
1969 | uint32_t WasmObjectFile::getSymbolSize(SymbolRef Symb) const { |
1970 | const WasmSymbol &Sym = getWasmSymbol(Symb); |
1971 | if (!Sym.isDefined()) |
1972 | return 0; |
1973 | if (Sym.isTypeGlobal()) |
1974 | return getDefinedGlobal(Index: Sym.Info.ElementIndex).Size; |
1975 | if (Sym.isTypeData()) |
1976 | return Sym.Info.DataRef.Size; |
1977 | if (Sym.isTypeFunction()) |
1978 | return functions()[Sym.Info.ElementIndex - getNumImportedFunctions()].Size; |
1979 | // Currently symbol size is only tracked for data segments and functions. In |
1980 | // principle we could also track size (e.g. binary size) for tables, globals |
1981 | // and element segments etc too. |
1982 | return 0; |
1983 | } |
1984 | |
1985 | void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; } |
1986 | |
1987 | Expected<StringRef> WasmObjectFile::getSectionName(DataRefImpl Sec) const { |
1988 | const WasmSection &S = Sections[Sec.d.a]; |
1989 | if (S.Type == wasm::WASM_SEC_CUSTOM) |
1990 | return S.Name; |
1991 | if (S.Type > wasm::WASM_SEC_LAST_KNOWN) |
1992 | return createStringError(EC: object_error::invalid_section_index, S: ""); |
1993 | return wasm::sectionTypeToString(type: S.Type); |
1994 | } |
1995 | |
1996 | uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { |
1997 | // For object files, use 0 for section addresses, and section offsets for |
1998 | // symbol addresses. For linked files, use file offsets. |
1999 | // See also getSymbolAddress. |
2000 | return isRelocatableObject() || isSharedObject() ? 0 |
2001 | : Sections[Sec.d.a].Offset; |
2002 | } |
2003 | |
2004 | uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const { |
2005 | return Sec.d.a; |
2006 | } |
2007 | |
2008 | uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const { |
2009 | const WasmSection &S = Sections[Sec.d.a]; |
2010 | return S.Content.size(); |
2011 | } |
2012 | |
2013 | Expected<ArrayRef<uint8_t>> |
2014 | WasmObjectFile::getSectionContents(DataRefImpl Sec) const { |
2015 | const WasmSection &S = Sections[Sec.d.a]; |
2016 | // This will never fail since wasm sections can never be empty (user-sections |
2017 | // must have a name and non-user sections each have a defined structure). |
2018 | return S.Content; |
2019 | } |
2020 | |
2021 | uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const { |
2022 | return 1; |
2023 | } |
2024 | |
2025 | bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const { |
2026 | return false; |
2027 | } |
2028 | |
2029 | bool WasmObjectFile::isSectionText(DataRefImpl Sec) const { |
2030 | return getWasmSection(Ref: Sec).Type == wasm::WASM_SEC_CODE; |
2031 | } |
2032 | |
2033 | bool WasmObjectFile::isSectionData(DataRefImpl Sec) const { |
2034 | return getWasmSection(Ref: Sec).Type == wasm::WASM_SEC_DATA; |
2035 | } |
2036 | |
2037 | bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; } |
2038 | |
2039 | bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; } |
2040 | |
2041 | relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const { |
2042 | DataRefImpl RelocRef; |
2043 | RelocRef.d.a = Ref.d.a; |
2044 | RelocRef.d.b = 0; |
2045 | return relocation_iterator(RelocationRef(RelocRef, this)); |
2046 | } |
2047 | |
2048 | relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const { |
2049 | const WasmSection &Sec = getWasmSection(Ref); |
2050 | DataRefImpl RelocRef; |
2051 | RelocRef.d.a = Ref.d.a; |
2052 | RelocRef.d.b = Sec.Relocations.size(); |
2053 | return relocation_iterator(RelocationRef(RelocRef, this)); |
2054 | } |
2055 | |
2056 | void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const { Rel.d.b++; } |
2057 | |
2058 | uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const { |
2059 | const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); |
2060 | return Rel.Offset; |
2061 | } |
2062 | |
2063 | symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Ref) const { |
2064 | const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); |
2065 | if (Rel.Type == wasm::R_WASM_TYPE_INDEX_LEB) |
2066 | return symbol_end(); |
2067 | DataRefImpl Sym; |
2068 | Sym.d.a = 1; |
2069 | Sym.d.b = Rel.Index; |
2070 | return symbol_iterator(SymbolRef(Sym, this)); |
2071 | } |
2072 | |
2073 | uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const { |
2074 | const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); |
2075 | return Rel.Type; |
2076 | } |
2077 | |
2078 | void WasmObjectFile::getRelocationTypeName( |
2079 | DataRefImpl Ref, SmallVectorImpl<char> &Result) const { |
2080 | const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); |
2081 | StringRef Res = "Unknown"; |
2082 | |
2083 | #define WASM_RELOC(name, value) \ |
2084 | case wasm::name: \ |
2085 | Res = #name; \ |
2086 | break; |
2087 | |
2088 | switch (Rel.Type) { |
2089 | #include "llvm/BinaryFormat/WasmRelocs.def" |
2090 | } |
2091 | |
2092 | #undef WASM_RELOC |
2093 | |
2094 | Result.append(in_start: Res.begin(), in_end: Res.end()); |
2095 | } |
2096 | |
2097 | section_iterator WasmObjectFile::section_begin() const { |
2098 | DataRefImpl Ref; |
2099 | Ref.d.a = 0; |
2100 | return section_iterator(SectionRef(Ref, this)); |
2101 | } |
2102 | |
2103 | section_iterator WasmObjectFile::section_end() const { |
2104 | DataRefImpl Ref; |
2105 | Ref.d.a = Sections.size(); |
2106 | return section_iterator(SectionRef(Ref, this)); |
2107 | } |
2108 | |
2109 | uint8_t WasmObjectFile::getBytesInAddress() const { |
2110 | return HasMemory64 ? 8 : 4; |
2111 | } |
2112 | |
2113 | StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; } |
2114 | |
2115 | Triple::ArchType WasmObjectFile::getArch() const { |
2116 | return HasMemory64 ? Triple::wasm64 : Triple::wasm32; |
2117 | } |
2118 | |
2119 | Expected<SubtargetFeatures> WasmObjectFile::getFeatures() const { |
2120 | return SubtargetFeatures(); |
2121 | } |
2122 | |
2123 | bool WasmObjectFile::isRelocatableObject() const { return HasLinkingSection; } |
2124 | |
2125 | bool WasmObjectFile::isSharedObject() const { return HasDylinkSection; } |
2126 | |
2127 | const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const { |
2128 | assert(Ref.d.a < Sections.size()); |
2129 | return Sections[Ref.d.a]; |
2130 | } |
2131 | |
2132 | const WasmSection & |
2133 | WasmObjectFile::getWasmSection(const SectionRef &Section) const { |
2134 | return getWasmSection(Ref: Section.getRawDataRefImpl()); |
2135 | } |
2136 | |
2137 | const wasm::WasmRelocation & |
2138 | WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const { |
2139 | return getWasmRelocation(Ref: Ref.getRawDataRefImpl()); |
2140 | } |
2141 | |
2142 | const wasm::WasmRelocation & |
2143 | WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const { |
2144 | assert(Ref.d.a < Sections.size()); |
2145 | const WasmSection &Sec = Sections[Ref.d.a]; |
2146 | assert(Ref.d.b < Sec.Relocations.size()); |
2147 | return Sec.Relocations[Ref.d.b]; |
2148 | } |
2149 | |
2150 | int WasmSectionOrderChecker::getSectionOrder(unsigned ID, |
2151 | StringRef CustomSectionName) { |
2152 | switch (ID) { |
2153 | case wasm::WASM_SEC_CUSTOM: |
2154 | return StringSwitch<unsigned>(CustomSectionName) |
2155 | .Case(S: "dylink", Value: WASM_SEC_ORDER_DYLINK) |
2156 | .Case(S: "dylink.0", Value: WASM_SEC_ORDER_DYLINK) |
2157 | .Case(S: "linking", Value: WASM_SEC_ORDER_LINKING) |
2158 | .StartsWith(S: "reloc.", Value: WASM_SEC_ORDER_RELOC) |
2159 | .Case(S: "name", Value: WASM_SEC_ORDER_NAME) |
2160 | .Case(S: "producers", Value: WASM_SEC_ORDER_PRODUCERS) |
2161 | .Case(S: "target_features", Value: WASM_SEC_ORDER_TARGET_FEATURES) |
2162 | .Default(Value: WASM_SEC_ORDER_NONE); |
2163 | case wasm::WASM_SEC_TYPE: |
2164 | return WASM_SEC_ORDER_TYPE; |
2165 | case wasm::WASM_SEC_IMPORT: |
2166 | return WASM_SEC_ORDER_IMPORT; |
2167 | case wasm::WASM_SEC_FUNCTION: |
2168 | return WASM_SEC_ORDER_FUNCTION; |
2169 | case wasm::WASM_SEC_TABLE: |
2170 | return WASM_SEC_ORDER_TABLE; |
2171 | case wasm::WASM_SEC_MEMORY: |
2172 | return WASM_SEC_ORDER_MEMORY; |
2173 | case wasm::WASM_SEC_GLOBAL: |
2174 | return WASM_SEC_ORDER_GLOBAL; |
2175 | case wasm::WASM_SEC_EXPORT: |
2176 | return WASM_SEC_ORDER_EXPORT; |
2177 | case wasm::WASM_SEC_START: |
2178 | return WASM_SEC_ORDER_START; |
2179 | case wasm::WASM_SEC_ELEM: |
2180 | return WASM_SEC_ORDER_ELEM; |
2181 | case wasm::WASM_SEC_CODE: |
2182 | return WASM_SEC_ORDER_CODE; |
2183 | case wasm::WASM_SEC_DATA: |
2184 | return WASM_SEC_ORDER_DATA; |
2185 | case wasm::WASM_SEC_DATACOUNT: |
2186 | return WASM_SEC_ORDER_DATACOUNT; |
2187 | case wasm::WASM_SEC_TAG: |
2188 | return WASM_SEC_ORDER_TAG; |
2189 | default: |
2190 | return WASM_SEC_ORDER_NONE; |
2191 | } |
2192 | } |
2193 | |
2194 | // Represents the edges in a directed graph where any node B reachable from node |
2195 | // A is not allowed to appear before A in the section ordering, but may appear |
2196 | // afterward. |
2197 | int WasmSectionOrderChecker::DisallowedPredecessors |
2198 | [WASM_NUM_SEC_ORDERS][WASM_NUM_SEC_ORDERS] = { |
2199 | // WASM_SEC_ORDER_NONE |
2200 | {}, |
2201 | // WASM_SEC_ORDER_TYPE |
2202 | {WASM_SEC_ORDER_TYPE, WASM_SEC_ORDER_IMPORT}, |
2203 | // WASM_SEC_ORDER_IMPORT |
2204 | {WASM_SEC_ORDER_IMPORT, WASM_SEC_ORDER_FUNCTION}, |
2205 | // WASM_SEC_ORDER_FUNCTION |
2206 | {WASM_SEC_ORDER_FUNCTION, WASM_SEC_ORDER_TABLE}, |
2207 | // WASM_SEC_ORDER_TABLE |
2208 | {WASM_SEC_ORDER_TABLE, WASM_SEC_ORDER_MEMORY}, |
2209 | // WASM_SEC_ORDER_MEMORY |
2210 | {WASM_SEC_ORDER_MEMORY, WASM_SEC_ORDER_TAG}, |
2211 | // WASM_SEC_ORDER_TAG |
2212 | {WASM_SEC_ORDER_TAG, WASM_SEC_ORDER_GLOBAL}, |
2213 | // WASM_SEC_ORDER_GLOBAL |
2214 | {WASM_SEC_ORDER_GLOBAL, WASM_SEC_ORDER_EXPORT}, |
2215 | // WASM_SEC_ORDER_EXPORT |
2216 | {WASM_SEC_ORDER_EXPORT, WASM_SEC_ORDER_START}, |
2217 | // WASM_SEC_ORDER_START |
2218 | {WASM_SEC_ORDER_START, WASM_SEC_ORDER_ELEM}, |
2219 | // WASM_SEC_ORDER_ELEM |
2220 | {WASM_SEC_ORDER_ELEM, WASM_SEC_ORDER_DATACOUNT}, |
2221 | // WASM_SEC_ORDER_DATACOUNT |
2222 | {WASM_SEC_ORDER_DATACOUNT, WASM_SEC_ORDER_CODE}, |
2223 | // WASM_SEC_ORDER_CODE |
2224 | {WASM_SEC_ORDER_CODE, WASM_SEC_ORDER_DATA}, |
2225 | // WASM_SEC_ORDER_DATA |
2226 | {WASM_SEC_ORDER_DATA, WASM_SEC_ORDER_LINKING}, |
2227 | |
2228 | // Custom Sections |
2229 | // WASM_SEC_ORDER_DYLINK |
2230 | {WASM_SEC_ORDER_DYLINK, WASM_SEC_ORDER_TYPE}, |
2231 | // WASM_SEC_ORDER_LINKING |
2232 | {WASM_SEC_ORDER_LINKING, WASM_SEC_ORDER_RELOC, WASM_SEC_ORDER_NAME}, |
2233 | // WASM_SEC_ORDER_RELOC (can be repeated) |
2234 | {}, |
2235 | // WASM_SEC_ORDER_NAME |
2236 | {WASM_SEC_ORDER_NAME, WASM_SEC_ORDER_PRODUCERS}, |
2237 | // WASM_SEC_ORDER_PRODUCERS |
2238 | {WASM_SEC_ORDER_PRODUCERS, WASM_SEC_ORDER_TARGET_FEATURES}, |
2239 | // WASM_SEC_ORDER_TARGET_FEATURES |
2240 | {WASM_SEC_ORDER_TARGET_FEATURES}}; |
2241 | |
2242 | bool WasmSectionOrderChecker::isValidSectionOrder(unsigned ID, |
2243 | StringRef CustomSectionName) { |
2244 | int Order = getSectionOrder(ID, CustomSectionName); |
2245 | if (Order == WASM_SEC_ORDER_NONE) |
2246 | return true; |
2247 | |
2248 | // Disallowed predecessors we need to check for |
2249 | SmallVector<int, WASM_NUM_SEC_ORDERS> WorkList; |
2250 | |
2251 | // Keep track of completed checks to avoid repeating work |
2252 | bool Checked[WASM_NUM_SEC_ORDERS] = {}; |
2253 | |
2254 | int Curr = Order; |
2255 | while (true) { |
2256 | // Add new disallowed predecessors to work list |
2257 | for (size_t I = 0;; ++I) { |
2258 | int Next = DisallowedPredecessors[Curr][I]; |
2259 | if (Next == WASM_SEC_ORDER_NONE) |
2260 | break; |
2261 | if (Checked[Next]) |
2262 | continue; |
2263 | WorkList.push_back(Elt: Next); |
2264 | Checked[Next] = true; |
2265 | } |
2266 | |
2267 | if (WorkList.empty()) |
2268 | break; |
2269 | |
2270 | // Consider next disallowed predecessor |
2271 | Curr = WorkList.pop_back_val(); |
2272 | if (Seen[Curr]) |
2273 | return false; |
2274 | } |
2275 | |
2276 | // Have not seen any disallowed predecessors |
2277 | Seen[Order] = true; |
2278 | return true; |
2279 | } |
2280 |
Definitions
- dump
- createWasmObjectFile
- readUint8
- readUint32
- readFloat32
- readFloat64
- readULEB128
- readString
- readLEB128
- readVaruint1
- readVarint32
- readVaruint32
- readVarint64
- readVaruint64
- readOpcode
- parseValType
- readInitExpr
- readLimits
- readTableType
- readSection
- WasmObjectFile
- parseSection
- parseDylinkSection
- parseDylink0Section
- parseNameSection
- parseLinkingSection
- parseLinkingSectionSymtab
- parseLinkingSectionComdat
- parseProducersSection
- parseTargetFeaturesSection
- parseRelocSection
- parseCustomSection
- parseTypeSection
- parseImportSection
- parseFunctionSection
- parseTableSection
- parseMemorySection
- parseTagSection
- parseGlobalSection
- parseExportSection
- isValidFunctionIndex
- isDefinedFunctionIndex
- isValidGlobalIndex
- isValidTableNumber
- isDefinedGlobalIndex
- isDefinedTableNumber
- isValidTagIndex
- isDefinedTagIndex
- isValidFunctionSymbol
- isValidTableSymbol
- isValidGlobalSymbol
- isValidTagSymbol
- isValidDataSymbol
- isValidSectionSymbol
- getDefinedFunction
- getDefinedFunction
- getDefinedGlobal
- getDefinedTag
- parseStartSection
- parseCodeSection
- parseElemSection
- parseDataSection
- parseDataCountSection
- getHeader
- moveSymbolNext
- getSymbolFlags
- symbol_begin
- symbol_end
- getWasmSymbol
- getWasmSymbol
- getSymbolName
- getSymbolAddress
- getWasmSymbolValue
- getSymbolValueImpl
- getSymbolAlignment
- getCommonSymbolSizeImpl
- getSymbolType
- getSymbolSection
- getSymbolSectionId
- getSymbolSectionIdImpl
- getSymbolSize
- moveSectionNext
- getSectionName
- getSectionAddress
- getSectionIndex
- getSectionSize
- getSectionContents
- getSectionAlignment
- isSectionCompressed
- isSectionText
- isSectionData
- isSectionBSS
- isSectionVirtual
- section_rel_begin
- section_rel_end
- moveRelocationNext
- getRelocationOffset
- getRelocationSymbol
- getRelocationType
- getRelocationTypeName
- section_begin
- section_end
- getBytesInAddress
- getFileFormatName
- getArch
- getFeatures
- isRelocatableObject
- isSharedObject
- getWasmSection
- getWasmSection
- getWasmRelocation
- getWasmRelocation
- getSectionOrder
- DisallowedPredecessors
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