oat_writer.cc revision 0755ec5ea1dce0b549fc1adefeb52d89f119ebec 
1// Copyright 2011 Google Inc. All Rights Reserved.
2
3#include "oat_writer.h"
4
5#include "class_linker.h"
6#include "class_loader.h"
7#include "file.h"
8#include "os.h"
9#include "stl_util.h"
10
11namespace art {
12
13bool OatWriter::Create(File* file,
14                       const ClassLoader* class_loader,
15                       const Compiler& compiler) {
16  const std::vector<const DexFile*>& dex_files = ClassLoader::GetCompileTimeClassPath(class_loader);
17  OatWriter oat_writer(dex_files, class_loader, compiler);
18  return oat_writer.Write(file);
19}
20
21OatWriter::OatWriter(const std::vector<const DexFile*>& dex_files,
22                     const ClassLoader* class_loader,
23                     const Compiler& compiler) {
24  compiler_ = &compiler;
25  class_loader_ = class_loader;
26  dex_files_ = &dex_files;
27  oat_header_ = NULL;
28  executable_offset_padding_length_ = 0;
29
30  size_t offset = InitOatHeader();
31  offset = InitOatDexFiles(offset);
32  offset = InitDexFiles(offset);
33  offset = InitOatClasses(offset);
34  offset = InitOatCode(offset);
35  offset = InitOatCodeDexFiles(offset);
36
37  CHECK_EQ(dex_files_->size(), oat_dex_files_.size());
38}
39
40OatWriter::~OatWriter() {
41  delete oat_header_;
42  STLDeleteElements(&oat_dex_files_);
43  STLDeleteElements(&oat_classes_);
44}
45
46size_t OatWriter::InitOatHeader() {
47  // create the OatHeader
48  oat_header_ = new OatHeader(dex_files_);
49  size_t offset = sizeof(*oat_header_);
50  return offset;
51}
52
53size_t OatWriter::InitOatDexFiles(size_t offset) {
54  // create the OatDexFiles
55  for (size_t i = 0; i != dex_files_->size(); ++i) {
56    const DexFile* dex_file = (*dex_files_)[i];
57    CHECK(dex_file != NULL);
58    OatDexFile* oat_dex_file = new OatDexFile(*dex_file);
59    oat_dex_files_.push_back(oat_dex_file);
60    offset += oat_dex_file->SizeOf();
61  }
62  return offset;
63}
64
65size_t OatWriter::InitDexFiles(size_t offset) {
66  // calculate the offsets within OatDexFiles to the DexFiles
67  for (size_t i = 0; i != dex_files_->size(); ++i) {
68    // dex files are required to be 4 byte aligned
69    offset = RoundUp(offset, 4);
70
71    // set offset in OatDexFile to DexFile
72    oat_dex_files_[i]->dex_file_offset_ = offset;
73
74    const DexFile* dex_file = (*dex_files_)[i];
75    offset += dex_file->GetHeader().file_size_;
76  }
77  return offset;
78}
79
80size_t OatWriter::InitOatClasses(size_t offset) {
81  // create the OatClasses
82  // calculate the offsets within OatDexFiles to OatClasses
83  size_t class_index = 0;
84  for (size_t i = 0; i != dex_files_->size(); ++i) {
85    const DexFile* dex_file = (*dex_files_)[i];
86    for (size_t class_def_index = 0;
87         class_def_index < dex_file->NumClassDefs();
88         class_def_index++, class_index++) {
89      oat_dex_files_[i]->methods_offsets_[class_def_index] = offset;
90      const DexFile::ClassDef& class_def = dex_file->GetClassDef(class_def_index);
91      const byte* class_data = dex_file->GetClassData(class_def);
92      uint32_t num_methods = 0;
93      if (class_data != NULL) {  // ie not an empty class, such as a marker interface
94        ClassDataItemIterator it(*dex_file, class_data);
95        size_t num_direct_methods = it.NumDirectMethods();
96        size_t num_virtual_methods = it.NumVirtualMethods();
97        num_methods = num_direct_methods + num_virtual_methods;
98      }
99
100      CompiledClass* compiled_class =
101          compiler_->GetCompiledClass(art::Compiler::MethodReference(dex_file, class_def_index));
102      Class::Status status =
103          (compiled_class != NULL) ? compiled_class->GetStatus() : Class::kStatusNotReady;
104
105      OatClass* oat_class = new OatClass(status, num_methods);
106      oat_classes_.push_back(oat_class);
107      offset += oat_class->SizeOf();
108    }
109    oat_dex_files_[i]->UpdateChecksum(*oat_header_);
110  }
111  return offset;
112}
113
114size_t OatWriter::InitOatCode(size_t offset) {
115  // calculate the offsets within OatHeader to executable code
116  size_t old_offset = offset;
117  // required to be on a new page boundary
118  offset = RoundUp(offset, kPageSize);
119  oat_header_->SetExecutableOffset(offset);
120  executable_offset_padding_length_ = offset - old_offset;
121  return offset;
122}
123
124size_t OatWriter::InitOatCodeDexFiles(size_t offset) {
125  size_t oat_class_index = 0;
126  for (size_t i = 0; i != dex_files_->size(); ++i) {
127    const DexFile* dex_file = (*dex_files_)[i];
128    CHECK(dex_file != NULL);
129    offset = InitOatCodeDexFile(offset, oat_class_index, *dex_file);
130  }
131  return offset;
132}
133
134size_t OatWriter::InitOatCodeDexFile(size_t offset,
135                                     size_t& oat_class_index,
136                                     const DexFile& dex_file) {
137   for (size_t class_def_index = 0;
138       class_def_index < dex_file.NumClassDefs();
139       class_def_index++, oat_class_index++) {
140    const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index);
141    offset = InitOatCodeClassDef(offset, oat_class_index, dex_file, class_def);
142    oat_classes_[oat_class_index]->UpdateChecksum(*oat_header_);
143  }
144  return offset;
145}
146
147size_t OatWriter::InitOatCodeClassDef(size_t offset,
148                                      size_t oat_class_index,
149                                      const DexFile& dex_file,
150                                      const DexFile::ClassDef& class_def) {
151  const byte* class_data = dex_file.GetClassData(class_def);
152  if (class_data == NULL) {
153    // empty class, such as a marker interface
154    return offset;
155  }
156  ClassDataItemIterator it(dex_file, class_data);
157  CHECK_EQ(oat_classes_[oat_class_index]->method_offsets_.size(),
158           it.NumDirectMethods() + it.NumVirtualMethods());
159  // Skip fields
160  while (it.HasNextStaticField()) {
161    it.Next();
162  }
163  while (it.HasNextInstanceField()) {
164    it.Next();
165  }
166  // Process methods
167  size_t class_def_method_index = 0;
168  while (it.HasNextDirectMethod()) {
169    bool is_static = (it.GetMemberAccessFlags() & kAccStatic) != 0;
170    offset = InitOatCodeMethod(offset, oat_class_index, class_def_method_index, is_static, true,
171                               it.GetMemberIndex(), &dex_file);
172    class_def_method_index++;
173    it.Next();
174  }
175  while (it.HasNextVirtualMethod()) {
176    CHECK_EQ(it.GetMemberAccessFlags() & kAccStatic, 0U);
177    offset = InitOatCodeMethod(offset, oat_class_index, class_def_method_index, false, false,
178                               it.GetMemberIndex(), &dex_file);
179    class_def_method_index++;
180    it.Next();
181  }
182  DCHECK(!it.HasNext());
183  return offset;
184}
185
186size_t OatWriter::InitOatCodeMethod(size_t offset, size_t oat_class_index,
187                                    size_t class_def_method_index, bool is_static, bool is_direct,
188                                    uint32_t method_idx, const DexFile* dex_file) {
189  // derived from CompiledMethod if available
190  uint32_t code_offset = 0;
191  uint32_t frame_size_in_bytes = kStackAlignment;
192  uint32_t core_spill_mask = 0;
193  uint32_t fp_spill_mask = 0;
194  uint32_t mapping_table_offset = 0;
195  uint32_t vmap_table_offset = 0;
196  // derived from CompiledInvokeStub if available
197  uint32_t invoke_stub_offset = 0;
198
199  CompiledMethod* compiled_method =
200      compiler_->GetCompiledMethod(art::Compiler::MethodReference(dex_file, method_idx));
201  if (compiled_method != NULL) {
202    offset = compiled_method->AlignCode(offset);
203    DCHECK_ALIGNED(offset, kArmAlignment);
204    const std::vector<uint8_t>& code = compiled_method->GetCode();
205    size_t code_size = code.size() * sizeof(code[0]);
206    uint32_t thumb_offset = compiled_method->CodeDelta();
207    code_offset = (code_size == 0) ? 0 : offset + thumb_offset;
208
209    // Deduplicate code arrays
210    std::map<const std::vector<uint8_t>*, uint32_t>::iterator code_iter = code_offsets_.find(&code);
211    if (code_iter != code_offsets_.end()) {
212      code_offset = code_iter->second;
213    } else {
214      code_offsets_.insert(std::pair<const std::vector<uint8_t>*, uint32_t>(&code, code_offset));
215      offset += code_size;
216      oat_header_->UpdateChecksum(&code[0], code_size);
217    }
218
219    frame_size_in_bytes = compiled_method->GetFrameSizeInBytes();
220    core_spill_mask = compiled_method->GetCoreSpillMask();
221    fp_spill_mask = compiled_method->GetFpSpillMask();
222  }
223
224  offset += sizeof(frame_size_in_bytes);
225  oat_header_->UpdateChecksum(&frame_size_in_bytes, sizeof(frame_size_in_bytes));
226
227  offset += sizeof(core_spill_mask);
228  oat_header_->UpdateChecksum(&core_spill_mask, sizeof(core_spill_mask));
229
230  offset += sizeof(fp_spill_mask);
231  oat_header_->UpdateChecksum(&fp_spill_mask, sizeof(fp_spill_mask));
232
233  if (compiled_method != NULL) {
234    const std::vector<uint32_t>& mapping_table = compiled_method->GetMappingTable();
235    size_t mapping_table_size = mapping_table.size() * sizeof(mapping_table[0]);
236    mapping_table_offset = (mapping_table_size == 0) ? 0 : offset;
237
238    // Deduplicate mapping tables
239    std::map<const std::vector<uint32_t>*, uint32_t>::iterator mapping_iter = mapping_table_offsets_.find(&mapping_table);
240    if (mapping_iter != mapping_table_offsets_.end()) {
241      mapping_table_offset = mapping_iter->second;
242    } else {
243      mapping_table_offsets_.insert(std::pair<const std::vector<uint32_t>*, uint32_t>(&mapping_table, mapping_table_offset));
244      offset += mapping_table_size;
245      oat_header_->UpdateChecksum(&mapping_table[0], mapping_table_size);
246    }
247
248    const std::vector<uint16_t>& vmap_table = compiled_method->GetVmapTable();
249    size_t vmap_table_size = vmap_table.size() * sizeof(vmap_table[0]);
250    vmap_table_offset = (vmap_table_size == 0) ? 0 : offset;
251
252    // Deduplicate vmap tables
253    std::map<const std::vector<uint16_t>*, uint32_t>::iterator vmap_iter = vmap_table_offsets_.find(&vmap_table);
254    if (vmap_iter != vmap_table_offsets_.end()) {
255      vmap_table_offset = vmap_iter->second;
256    } else {
257      vmap_table_offsets_.insert(std::pair<const std::vector<uint16_t>*, uint32_t>(&vmap_table, vmap_table_offset));
258      offset += vmap_table_size;
259      oat_header_->UpdateChecksum(&vmap_table[0], vmap_table_size);
260    }
261  }
262
263  const char* shorty = dex_file->GetMethodShorty(dex_file->GetMethodId(method_idx));
264  const CompiledInvokeStub* compiled_invoke_stub = compiler_->FindInvokeStub(is_static, shorty);
265  if (compiled_invoke_stub != NULL) {
266    offset = CompiledMethod::AlignCode(offset, compiler_->GetInstructionSet());
267    DCHECK_ALIGNED(offset, kArmAlignment);
268    const std::vector<uint8_t>& invoke_stub = compiled_invoke_stub->GetCode();
269    size_t invoke_stub_size = invoke_stub.size() * sizeof(invoke_stub[0]);
270    invoke_stub_offset = (invoke_stub_size == 0) ? 0 : offset;
271
272    // Deduplicate invoke stubs
273    std::map<const std::vector<uint8_t>*, uint32_t>::iterator stub_iter = code_offsets_.find(&invoke_stub);
274    if (stub_iter != code_offsets_.end()) {
275      invoke_stub_offset = stub_iter->second;
276    } else {
277      code_offsets_.insert(std::pair<const std::vector<uint8_t>*, uint32_t>(&invoke_stub, invoke_stub_offset));
278      offset += invoke_stub_size;
279      oat_header_->UpdateChecksum(&invoke_stub[0], invoke_stub_size);
280    }
281  }
282
283  oat_classes_[oat_class_index]->method_offsets_[class_def_method_index]
284      = OatMethodOffsets(code_offset,
285                         frame_size_in_bytes,
286                         core_spill_mask,
287                         fp_spill_mask,
288                         mapping_table_offset,
289                         vmap_table_offset,
290                         invoke_stub_offset);
291
292  if (compiler_->IsImage()) {
293    ClassLinker* linker = Runtime::Current()->GetClassLinker();
294    DexCache* dex_cache = linker->FindDexCache(*dex_file);
295    Method* method = linker->ResolveMethod(*dex_file, method_idx, dex_cache, class_loader_,
296                                           is_direct);
297    CHECK(method != NULL);
298    method->SetFrameSizeInBytes(frame_size_in_bytes);
299    method->SetCoreSpillMask(core_spill_mask);
300    method->SetFpSpillMask(fp_spill_mask);
301    method->SetOatMappingTableOffset(mapping_table_offset);
302    method->SetOatCodeOffset(code_offset);
303    method->SetOatVmapTableOffset(vmap_table_offset);
304    method->SetOatInvokeStubOffset(invoke_stub_offset);
305  }
306  return offset;
307}
308
309#define DCHECK_CODE_OFFSET() \
310  DCHECK_EQ(static_cast<off_t>(code_offset), lseek(file->Fd(), 0, SEEK_CUR))
311
312bool OatWriter::Write(File* file) {
313  if (!file->WriteFully(oat_header_, sizeof(*oat_header_))) {
314    PLOG(ERROR) << "Failed to write oat header to " << file->name();
315    return false;
316  }
317
318  if (!WriteTables(file)) {
319    LOG(ERROR) << "Failed to write oat tables to " << file->name();
320    return false;
321  }
322
323  size_t code_offset = WriteCode(file);
324  if (code_offset == 0) {
325    LOG(ERROR) << "Failed to write oat code to " << file->name();
326    return false;
327  }
328
329  code_offset = WriteCodeDexFiles(file, code_offset);
330  if (code_offset == 0) {
331    LOG(ERROR) << "Failed to write oat code for dex files to " << file->name();
332    return false;
333  }
334
335  return true;
336}
337
338bool OatWriter::WriteTables(File* file) {
339  for (size_t i = 0; i != oat_dex_files_.size(); ++i) {
340    if (!oat_dex_files_[i]->Write(file)) {
341      PLOG(ERROR) << "Failed to write oat dex information to " << file->name();
342      return false;
343    }
344  }
345  for (size_t i = 0; i != oat_dex_files_.size(); ++i) {
346    uint32_t expected_offset = oat_dex_files_[i]->dex_file_offset_;
347    off_t actual_offset = lseek(file->Fd(), expected_offset, SEEK_SET);
348    if (static_cast<uint32_t>(actual_offset) != expected_offset) {
349      const DexFile* dex_file = (*dex_files_)[i];
350      PLOG(ERROR) << "Failed to seek to dex file section. Actual: " << actual_offset
351                  << " Expected: " << expected_offset << " File: " << dex_file->GetLocation();
352      return false;
353    }
354    const DexFile* dex_file = (*dex_files_)[i];
355    if (!file->WriteFully(&dex_file->GetHeader(), dex_file->GetHeader().file_size_)) {
356      PLOG(ERROR) << "Failed to write dex file " << dex_file->GetLocation() << " to " << file->name();
357      return false;
358    }
359  }
360  for (size_t i = 0; i != oat_classes_.size(); ++i) {
361    if (!oat_classes_[i]->Write(file)) {
362      PLOG(ERROR) << "Failed to write oat methods information to " << file->name();
363      return false;
364    }
365  }
366  return true;
367}
368
369size_t OatWriter::WriteCode(File* file) {
370  uint32_t code_offset = oat_header_->GetExecutableOffset();
371  off_t new_offset = lseek(file->Fd(), executable_offset_padding_length_, SEEK_CUR);
372  if (static_cast<uint32_t>(new_offset) != code_offset) {
373    PLOG(ERROR) << "Failed to seek to oat code section. Actual: " << new_offset
374                << " Expected: " << code_offset << " File: " << file->name();
375    return 0;
376  }
377  DCHECK_CODE_OFFSET();
378  return code_offset;
379}
380
381size_t OatWriter::WriteCodeDexFiles(File* file, size_t code_offset) {
382  size_t oat_class_index = 0;
383  for (size_t i = 0; i != oat_dex_files_.size(); ++i) {
384    const DexFile* dex_file = (*dex_files_)[i];
385    CHECK(dex_file != NULL);
386    code_offset = WriteCodeDexFile(file, code_offset, oat_class_index, *dex_file);
387    if (code_offset == 0) {
388      return 0;
389    }
390  }
391  return code_offset;
392}
393
394size_t OatWriter::WriteCodeDexFile(File* file, size_t code_offset, size_t& oat_class_index,
395                                   const DexFile& dex_file) {
396  for (size_t class_def_index = 0; class_def_index < dex_file.NumClassDefs();
397      class_def_index++, oat_class_index++) {
398    const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index);
399    code_offset = WriteCodeClassDef(file, code_offset, oat_class_index, dex_file, class_def);
400    if (code_offset == 0) {
401      return 0;
402    }
403  }
404  return code_offset;
405}
406
407void OatWriter::ReportWriteFailure(const char* what, uint32_t method_idx,
408                                   const DexFile& dex_file, File* f) const {
409  PLOG(ERROR) << "Failed to write " << what << " for " << PrettyMethod(method_idx, dex_file)
410      << " to " << f->name();
411}
412
413size_t OatWriter::WriteCodeClassDef(File* file,
414                                    size_t code_offset, size_t oat_class_index,
415                                    const DexFile& dex_file,
416                                    const DexFile::ClassDef& class_def) {
417  const byte* class_data = dex_file.GetClassData(class_def);
418  if (class_data == NULL) {
419    // ie. an empty class such as a marker interface
420    return code_offset;
421  }
422  ClassDataItemIterator it(dex_file, class_data);
423  // Skip fields
424  while (it.HasNextStaticField()) {
425    it.Next();
426  }
427  while (it.HasNextInstanceField()) {
428    it.Next();
429  }
430  // Process methods
431  size_t class_def_method_index = 0;
432  while (it.HasNextDirectMethod()) {
433    bool is_static = (it.GetMemberAccessFlags() & kAccStatic) != 0;
434    code_offset = WriteCodeMethod(file, code_offset, oat_class_index, class_def_method_index,
435                                  is_static, it.GetMemberIndex(), dex_file);
436    if (code_offset == 0) {
437      return 0;
438    }
439    class_def_method_index++;
440    it.Next();
441  }
442  while (it.HasNextVirtualMethod()) {
443    code_offset = WriteCodeMethod(file, code_offset, oat_class_index, class_def_method_index,
444                                  false, it.GetMemberIndex(), dex_file);
445    if (code_offset == 0) {
446      return 0;
447    }
448    class_def_method_index++;
449    it.Next();
450  }
451  return code_offset;
452}
453
454size_t OatWriter::WriteCodeMethod(File* file, size_t code_offset, size_t oat_class_index,
455                                  size_t class_def_method_index, bool is_static,
456                                  uint32_t method_idx, const DexFile& dex_file) {
457  const CompiledMethod* compiled_method =
458      compiler_->GetCompiledMethod(art::Compiler::MethodReference(&dex_file, method_idx));
459
460  uint32_t frame_size_in_bytes = 0;
461  uint32_t core_spill_mask = 0;
462  uint32_t fp_spill_mask = 0;
463
464  OatMethodOffsets method_offsets =
465      oat_classes_[oat_class_index]->method_offsets_[class_def_method_index];
466
467
468  if (compiled_method != NULL) {  // ie. not an abstract method
469    uint32_t aligned_code_offset = compiled_method->AlignCode(code_offset);
470    uint32_t aligned_code_delta = aligned_code_offset - code_offset;
471    if (aligned_code_delta != 0) {
472      off_t new_offset = lseek(file->Fd(), aligned_code_delta, SEEK_CUR);
473      if (static_cast<uint32_t>(new_offset) != aligned_code_offset) {
474        PLOG(ERROR) << "Failed to seek to align oat code. Actual: " << new_offset
475                    << " Expected: " << aligned_code_offset << " File: " << file->name();
476        return false;
477      }
478      code_offset += aligned_code_delta;
479      DCHECK_CODE_OFFSET();
480    }
481    DCHECK_ALIGNED(code_offset, kArmAlignment);
482    const std::vector<uint8_t>& code = compiled_method->GetCode();
483    size_t code_size = code.size() * sizeof(code[0]);
484
485    // Deduplicate code arrays
486    size_t offset = code_offset + compiled_method->CodeDelta();
487    std::map<const std::vector<uint8_t>*, uint32_t>::iterator code_iter = code_offsets_.find(&code);
488    if (code_iter != code_offsets_.end() && offset != method_offsets.code_offset_) {
489      DCHECK((code_size == 0 && method_offsets.code_offset_ == 0)
490             || code_iter->second == method_offsets.code_offset_)
491             << PrettyMethod(method_idx, dex_file);
492    } else {
493      DCHECK((code_size == 0 && method_offsets.code_offset_ == 0)
494             || offset == method_offsets.code_offset_)
495             << PrettyMethod(method_idx, dex_file);
496      if (!file->WriteFully(&code[0], code_size)) {
497        ReportWriteFailure("method code", method_idx, dex_file, file);
498        return false;
499      }
500      code_offset += code_size;
501    }
502    DCHECK_CODE_OFFSET();
503    frame_size_in_bytes = compiled_method->GetFrameSizeInBytes();
504    core_spill_mask = compiled_method->GetCoreSpillMask();
505    fp_spill_mask = compiled_method->GetFpSpillMask();
506  }
507
508  if (!file->WriteFully(&frame_size_in_bytes, sizeof(frame_size_in_bytes))) {
509    ReportWriteFailure("method frame size", method_idx, dex_file, file);
510    return false;
511  }
512  code_offset += sizeof(frame_size_in_bytes);
513  if (!file->WriteFully(&core_spill_mask, sizeof(core_spill_mask))) {
514    ReportWriteFailure("method core spill mask", method_idx, dex_file, file);
515    return false;
516  }
517  code_offset += sizeof(core_spill_mask);
518  if (!file->WriteFully(&fp_spill_mask, sizeof(fp_spill_mask))) {
519    ReportWriteFailure("method fp spill mask", method_idx, dex_file, file);
520    return false;
521  }
522  code_offset += sizeof(fp_spill_mask);
523
524  if (compiled_method != NULL) {
525    const std::vector<uint32_t>& mapping_table = compiled_method->GetMappingTable();
526    size_t mapping_table_size = mapping_table.size() * sizeof(mapping_table[0]);
527
528    // Deduplicate mapping tables
529    std::map<const std::vector<uint32_t>*, uint32_t>::iterator mapping_iter =
530        mapping_table_offsets_.find(&mapping_table);
531    if (mapping_iter != mapping_table_offsets_.end() &&
532        code_offset != method_offsets.mapping_table_offset_) {
533      DCHECK((mapping_table_size == 0 && method_offsets.mapping_table_offset_ == 0)
534          || mapping_iter->second == method_offsets.mapping_table_offset_)
535          << PrettyMethod(method_idx, dex_file);
536    } else {
537      DCHECK((mapping_table_size == 0 && method_offsets.mapping_table_offset_ == 0)
538          || code_offset == method_offsets.mapping_table_offset_)
539          << PrettyMethod(method_idx, dex_file);
540      if (!file->WriteFully(&mapping_table[0], mapping_table_size)) {
541        ReportWriteFailure("mapping table", method_idx, dex_file, file);
542        return false;
543      }
544      code_offset += mapping_table_size;
545    }
546    DCHECK_CODE_OFFSET();
547
548    const std::vector<uint16_t>& vmap_table = compiled_method->GetVmapTable();
549    size_t vmap_table_size = vmap_table.size() * sizeof(vmap_table[0]);
550
551    // Deduplicate vmap tables
552    std::map<const std::vector<uint16_t>*, uint32_t>::iterator vmap_iter =
553        vmap_table_offsets_.find(&vmap_table);
554    if (vmap_iter != vmap_table_offsets_.end() &&
555        code_offset != method_offsets.vmap_table_offset_) {
556      DCHECK((vmap_table_size == 0 && method_offsets.vmap_table_offset_ == 0)
557          || vmap_iter->second == method_offsets.vmap_table_offset_)
558          << PrettyMethod(method_idx, dex_file);
559    } else {
560      DCHECK((vmap_table_size == 0 && method_offsets.vmap_table_offset_ == 0)
561          || code_offset == method_offsets.vmap_table_offset_)
562          << PrettyMethod(method_idx, dex_file);
563      if (!file->WriteFully(&vmap_table[0], vmap_table_size)) {
564        ReportWriteFailure("vmap table", method_idx, dex_file, file);
565        return false;
566      }
567      code_offset += vmap_table_size;
568    }
569    DCHECK_CODE_OFFSET();
570  }
571  const char* shorty = dex_file.GetMethodShorty(dex_file.GetMethodId(method_idx));
572  const CompiledInvokeStub* compiled_invoke_stub = compiler_->FindInvokeStub(is_static, shorty);
573  if (compiled_invoke_stub != NULL) {
574    uint32_t aligned_code_offset = CompiledMethod::AlignCode(code_offset,
575                                                             compiler_->GetInstructionSet());
576    uint32_t aligned_code_delta = aligned_code_offset - code_offset;
577    if (aligned_code_delta != 0) {
578      off_t new_offset = lseek(file->Fd(), aligned_code_delta, SEEK_CUR);
579      if (static_cast<uint32_t>(new_offset) != aligned_code_offset) {
580        PLOG(ERROR) << "Failed to seek to align invoke stub code. Actual: " << new_offset
581                    << " Expected: " << aligned_code_offset;
582        return false;
583      }
584      code_offset += aligned_code_delta;
585      DCHECK_CODE_OFFSET();
586    }
587    DCHECK_ALIGNED(code_offset, kArmAlignment);
588    const std::vector<uint8_t>& invoke_stub = compiled_invoke_stub->GetCode();
589    size_t invoke_stub_size = invoke_stub.size() * sizeof(invoke_stub[0]);
590
591    // Deduplicate invoke stubs
592    std::map<const std::vector<uint8_t>*, uint32_t>::iterator stub_iter =
593        code_offsets_.find(&invoke_stub);
594    if (stub_iter != code_offsets_.end() &&
595        code_offset != method_offsets.invoke_stub_offset_) {
596      DCHECK((invoke_stub_size == 0 && method_offsets.invoke_stub_offset_ == 0)
597          || stub_iter->second == method_offsets.invoke_stub_offset_)
598          << PrettyMethod(method_idx, dex_file);
599    } else {
600      DCHECK((invoke_stub_size == 0 && method_offsets.invoke_stub_offset_ == 0)
601          || code_offset == method_offsets.invoke_stub_offset_)
602          << PrettyMethod(method_idx, dex_file);
603      if (!file->WriteFully(&invoke_stub[0], invoke_stub_size)) {
604        ReportWriteFailure("invoke stub code", method_idx, dex_file, file);
605        return false;
606      }
607      code_offset += invoke_stub_size;
608    }
609    DCHECK_CODE_OFFSET();
610  }
611  return code_offset;
612}
613
614OatWriter::OatDexFile::OatDexFile(const DexFile& dex_file) {
615  const std::string& location(dex_file.GetLocation());
616  dex_file_location_size_ = location.size();
617  dex_file_location_data_ = reinterpret_cast<const uint8_t*>(location.data());
618  dex_file_checksum_ = dex_file.GetHeader().checksum_;
619  dex_file_offset_ = 0;
620  methods_offsets_.resize(dex_file.NumClassDefs());
621}
622
623size_t OatWriter::OatDexFile::SizeOf() const {
624  return sizeof(dex_file_location_size_)
625          + dex_file_location_size_
626          + sizeof(dex_file_checksum_)
627          + sizeof(dex_file_offset_)
628          + (sizeof(methods_offsets_[0]) * methods_offsets_.size());
629}
630
631void OatWriter::OatDexFile::UpdateChecksum(OatHeader& oat_header) const {
632  oat_header.UpdateChecksum(&dex_file_location_size_, sizeof(dex_file_location_size_));
633  oat_header.UpdateChecksum(dex_file_location_data_, dex_file_location_size_);
634  oat_header.UpdateChecksum(&dex_file_checksum_, sizeof(dex_file_checksum_));
635  oat_header.UpdateChecksum(&dex_file_offset_, sizeof(dex_file_offset_));
636  oat_header.UpdateChecksum(&methods_offsets_[0],
637                            sizeof(methods_offsets_[0]) * methods_offsets_.size());
638}
639
640bool OatWriter::OatDexFile::Write(File* file) const {
641  if (!file->WriteFully(&dex_file_location_size_, sizeof(dex_file_location_size_))) {
642    PLOG(ERROR) << "Failed to write dex file location length to " << file->name();
643    return false;
644  }
645  if (!file->WriteFully(dex_file_location_data_, dex_file_location_size_)) {
646    PLOG(ERROR) << "Failed to write dex file location data to " << file->name();
647    return false;
648  }
649  if (!file->WriteFully(&dex_file_checksum_, sizeof(dex_file_checksum_))) {
650    PLOG(ERROR) << "Failed to write dex file checksum to " << file->name();
651    return false;
652  }
653  if (!file->WriteFully(&dex_file_offset_, sizeof(dex_file_offset_))) {
654    PLOG(ERROR) << "Failed to write dex file offset to " << file->name();
655    return false;
656  }
657  if (!file->WriteFully(&methods_offsets_[0],
658                        sizeof(methods_offsets_[0]) * methods_offsets_.size())) {
659    PLOG(ERROR) << "Failed to write methods offsets to " << file->name();
660    return false;
661  }
662  return true;
663}
664
665OatWriter::OatClass::OatClass(Class::Status status, uint32_t methods_count) {
666  status_ = status;
667  method_offsets_.resize(methods_count);
668}
669
670size_t OatWriter::OatClass::SizeOf() const {
671  return sizeof(status_)
672          + (sizeof(method_offsets_[0]) * method_offsets_.size());
673}
674
675void OatWriter::OatClass::UpdateChecksum(OatHeader& oat_header) const {
676  oat_header.UpdateChecksum(&status_, sizeof(status_));
677  oat_header.UpdateChecksum(&method_offsets_[0],
678                            sizeof(method_offsets_[0]) * method_offsets_.size());
679}
680
681bool OatWriter::OatClass::Write(File* file) const {
682  if (!file->WriteFully(&status_, sizeof(status_))) {
683    PLOG(ERROR) << "Failed to write class status to " << file->name();
684    return false;
685  }
686  if (!file->WriteFully(&method_offsets_[0],
687                        sizeof(method_offsets_[0]) * method_offsets_.size())) {
688    PLOG(ERROR) << "Failed to write method offsets to " << file->name();
689    return false;
690  }
691  return true;
692}
693
694}  // namespace art
695