aboutsummaryrefslogtreecommitdiffstats
path: root/source/Plugins/ObjectFile/JIT/ObjectFileJIT.cpp
blob: c55b96d9110b3d7b8b025d6e29f7a74c730c27a6 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
//===-- ObjectFileJIT.cpp ---------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "llvm/ADT/StringRef.h"

#include "ObjectFileJIT.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/FileSpecList.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleSpec.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Section.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Host/Host.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Target/Platform.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/SectionLoadList.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/ArchSpec.h"
#include "lldb/Utility/DataBuffer.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/FileSpec.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RangeMap.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/Timer.h"
#include "lldb/Utility/UUID.h"

#ifndef __APPLE__
#include "Utility/UuidCompatibility.h"
#endif

using namespace lldb;
using namespace lldb_private;

char ObjectFileJIT::ID;

void ObjectFileJIT::Initialize() {
  PluginManager::RegisterPlugin(GetPluginNameStatic(),
                                GetPluginDescriptionStatic(), CreateInstance,
                                CreateMemoryInstance, GetModuleSpecifications);
}

void ObjectFileJIT::Terminate() {
  PluginManager::UnregisterPlugin(CreateInstance);
}

lldb_private::ConstString ObjectFileJIT::GetPluginNameStatic() {
  static ConstString g_name("jit");
  return g_name;
}

const char *ObjectFileJIT::GetPluginDescriptionStatic() {
  return "JIT code object file";
}

ObjectFile *ObjectFileJIT::CreateInstance(const lldb::ModuleSP &module_sp,
                                          DataBufferSP &data_sp,
                                          lldb::offset_t data_offset,
                                          const FileSpec *file,
                                          lldb::offset_t file_offset,
                                          lldb::offset_t length) {
  // JIT'ed object file is backed by the ObjectFileJITDelegate, never read from
  // a file
  return nullptr;
}

ObjectFile *ObjectFileJIT::CreateMemoryInstance(const lldb::ModuleSP &module_sp,
                                                DataBufferSP &data_sp,
                                                const ProcessSP &process_sp,
                                                lldb::addr_t header_addr) {
  // JIT'ed object file is backed by the ObjectFileJITDelegate, never read from
  // memory
  return nullptr;
}

size_t ObjectFileJIT::GetModuleSpecifications(
    const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp,
    lldb::offset_t data_offset, lldb::offset_t file_offset,
    lldb::offset_t length, lldb_private::ModuleSpecList &specs) {
  // JIT'ed object file can't be read from a file on disk
  return 0;
}

ObjectFileJIT::ObjectFileJIT(const lldb::ModuleSP &module_sp,
                             const ObjectFileJITDelegateSP &delegate_sp)
    : ObjectFile(module_sp, nullptr, 0, 0, DataBufferSP(), 0), m_delegate_wp() {
  if (delegate_sp) {
    m_delegate_wp = delegate_sp;
    m_data.SetByteOrder(delegate_sp->GetByteOrder());
    m_data.SetAddressByteSize(delegate_sp->GetAddressByteSize());
  }
}

ObjectFileJIT::~ObjectFileJIT() {}

bool ObjectFileJIT::ParseHeader() {
  // JIT code is never in a file, nor is it required to have any header
  return false;
}

ByteOrder ObjectFileJIT::GetByteOrder() const { return m_data.GetByteOrder(); }

bool ObjectFileJIT::IsExecutable() const { return false; }

uint32_t ObjectFileJIT::GetAddressByteSize() const {
  return m_data.GetAddressByteSize();
}

Symtab *ObjectFileJIT::GetSymtab() {
  ModuleSP module_sp(GetModule());
  if (module_sp) {
    std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
    if (m_symtab_up == nullptr) {
      m_symtab_up.reset(new Symtab(this));
      std::lock_guard<std::recursive_mutex> symtab_guard(
          m_symtab_up->GetMutex());
      ObjectFileJITDelegateSP delegate_sp(m_delegate_wp.lock());
      if (delegate_sp)
        delegate_sp->PopulateSymtab(this, *m_symtab_up);
      // TODO: get symbols from delegate
      m_symtab_up->Finalize();
    }
  }
  return m_symtab_up.get();
}

bool ObjectFileJIT::IsStripped() {
  return false; // JIT code that is in a module is never stripped
}

void ObjectFileJIT::CreateSections(SectionList &unified_section_list) {
  if (!m_sections_up) {
    m_sections_up.reset(new SectionList());
    ObjectFileJITDelegateSP delegate_sp(m_delegate_wp.lock());
    if (delegate_sp) {
      delegate_sp->PopulateSectionList(this, *m_sections_up);
      unified_section_list = *m_sections_up;
    }
  }
}

void ObjectFileJIT::Dump(Stream *s) {
  ModuleSP module_sp(GetModule());
  if (module_sp) {
    std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex());
    s->Printf("%p: ", static_cast<void *>(this));
    s->Indent();
    s->PutCString("ObjectFileJIT");

    if (ArchSpec arch = GetArchitecture())
      *s << ", arch = " << arch.GetArchitectureName();

    s->EOL();

    SectionList *sections = GetSectionList();
    if (sections)
      sections->Dump(s, nullptr, true, UINT32_MAX);

    if (m_symtab_up)
      m_symtab_up->Dump(s, nullptr, eSortOrderNone);
  }
}

UUID ObjectFileJIT::GetUUID() {
  // TODO: maybe get from delegate, not needed for first pass
  return UUID();
}

uint32_t ObjectFileJIT::GetDependentModules(FileSpecList &files) {
  // JIT modules don't have dependencies, but they could
  // if external functions are called and we know where they are
  files.Clear();
  return 0;
}

lldb_private::Address ObjectFileJIT::GetEntryPointAddress() {
  return Address();
}

lldb_private::Address ObjectFileJIT::GetBaseAddress() { return Address(); }

ObjectFile::Type ObjectFileJIT::CalculateType() { return eTypeJIT; }

ObjectFile::Strata ObjectFileJIT::CalculateStrata() { return eStrataJIT; }

ArchSpec ObjectFileJIT::GetArchitecture() {
  if (ObjectFileJITDelegateSP delegate_sp = m_delegate_wp.lock())
    return delegate_sp->GetArchitecture();
  return ArchSpec();
}

// PluginInterface protocol
lldb_private::ConstString ObjectFileJIT::GetPluginName() {
  return GetPluginNameStatic();
}

uint32_t ObjectFileJIT::GetPluginVersion() { return 1; }

bool ObjectFileJIT::SetLoadAddress(Target &target, lldb::addr_t value,
                                   bool value_is_offset) {
  size_t num_loaded_sections = 0;
  SectionList *section_list = GetSectionList();
  if (section_list) {
    const size_t num_sections = section_list->GetSize();
    // "value" is an offset to apply to each top level segment
    for (size_t sect_idx = 0; sect_idx < num_sections; ++sect_idx) {
      // Iterate through the object file sections to find all of the sections
      // that size on disk (to avoid __PAGEZERO) and load them
      SectionSP section_sp(section_list->GetSectionAtIndex(sect_idx));
      if (section_sp && section_sp->GetFileSize() > 0 &&
          !section_sp->IsThreadSpecific()) {
        if (target.GetSectionLoadList().SetSectionLoadAddress(
                section_sp, section_sp->GetFileAddress() + value))
          ++num_loaded_sections;
      }
    }
  }
  return num_loaded_sections > 0;
}

size_t ObjectFileJIT::ReadSectionData(lldb_private::Section *section,
                                      lldb::offset_t section_offset, void *dst,
                                      size_t dst_len) {
  lldb::offset_t file_size = section->GetFileSize();
  if (section_offset < file_size) {
    size_t src_len = file_size - section_offset;
    if (src_len > dst_len)
      src_len = dst_len;
    const uint8_t *src =
        ((uint8_t *)(uintptr_t)section->GetFileOffset()) + section_offset;

    memcpy(dst, src, src_len);
    return src_len;
  }
  return 0;
}

size_t ObjectFileJIT::ReadSectionData(
    lldb_private::Section *section,
    lldb_private::DataExtractor &section_data) {
  if (section->GetFileSize()) {
    const void *src = (void *)(uintptr_t)section->GetFileOffset();

    DataBufferSP data_sp =
        std::make_shared<DataBufferHeap>(src, section->GetFileSize());
    section_data.SetData(data_sp, 0, data_sp->GetByteSize());
    section_data.SetByteOrder(GetByteOrder());
    section_data.SetAddressByteSize(GetAddressByteSize());
    return section_data.GetByteSize();
  }
  section_data.Clear();
  return 0;
}