Added asmjit.

Fixed solution file.

1 files changed, 1110 insertions, 0 deletions

diff --git a/client/asmjit/core/codeholder.cpp b/client/asmjit/core/codeholder.cpp
new file mode 100644
index 0000000..69032e8
--- /dev/null
+++ b/client/asmjit/core/codeholder.cpp
@@ -0,0 +1,1110 @@
+// AsmJit - Machine code generation for C++
+//
+//  * Official AsmJit Home Page: https://asmjit.com
+//  * Official Github Repository: https://github.com/asmjit/asmjit
+//
+// Copyright (c) 2008-2020 The AsmJit Authors
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+
+#include "../core/api-build_p.h"
+#include "../core/assembler.h"
+#include "../core/logger.h"
+#include "../core/support.h"
+
+ASMJIT_BEGIN_NAMESPACE
+
+// ============================================================================
+// [Globals]
+// ============================================================================
+
+static const char CodeHolder_addrTabName[] = ".addrtab";
+
+//! Encode MOD byte.
+static inline uint32_t x86EncodeMod(uint32_t m, uint32_t o, uint32_t rm) noexcept {
+  return (m << 6) | (o << 3) | rm;
+}
+
+// ============================================================================
+// [asmjit::LabelLinkIterator]
+// ============================================================================
+
+class LabelLinkIterator {
+public:
+  ASMJIT_INLINE LabelLinkIterator(LabelEntry* le) noexcept { reset(le); }
+
+  ASMJIT_INLINE explicit operator bool() const noexcept { return isValid(); }
+  ASMJIT_INLINE bool isValid() const noexcept { return _link != nullptr; }
+
+  ASMJIT_INLINE LabelLink* link() const noexcept { return _link; }
+  ASMJIT_INLINE LabelLink* operator->() const noexcept { return _link; }
+
+  ASMJIT_INLINE void reset(LabelEntry* le) noexcept {
+    _pPrev = &le->_links;
+    _link = *_pPrev;
+  }
+
+  ASMJIT_INLINE void next() noexcept {
+    _pPrev = &_link->next;
+    _link = *_pPrev;
+  }
+
+  ASMJIT_INLINE void resolveAndNext(CodeHolder* code) noexcept {
+    LabelLink* linkToDelete = _link;
+
+    _link = _link->next;
+    *_pPrev = _link;
+
+    code->_unresolvedLinkCount--;
+    code->_allocator.release(linkToDelete, sizeof(LabelLink));
+  }
+
+  LabelLink** _pPrev;
+  LabelLink* _link;
+};
+
+// ============================================================================
+// [asmjit::CodeHolder - Utilities]
+// ============================================================================
+
+static void CodeHolder_resetInternal(CodeHolder* self, uint32_t resetPolicy) noexcept {
+  uint32_t i;
+  const ZoneVector<BaseEmitter*>& emitters = self->emitters();
+
+  i = emitters.size();
+  while (i)
+    self->detach(emitters[--i]);
+
+  // Reset everything into its construction state.
+  self->_environment.reset();
+  self->_baseAddress = Globals::kNoBaseAddress;
+  self->_logger = nullptr;
+  self->_errorHandler = nullptr;
+
+  // Reset all sections.
+  uint32_t numSections = self->_sections.size();
+  for (i = 0; i < numSections; i++) {
+    Section* section = self->_sections[i];
+    if (section->_buffer.data() && !section->_buffer.isExternal())
+      ::free(section->_buffer._data);
+    section->_buffer._data = nullptr;
+    section->_buffer._capacity = 0;
+  }
+
+  // Reset zone allocator and all containers using it.
+  ZoneAllocator* allocator = self->allocator();
+
+  self->_emitters.reset();
+  self->_namedLabels.reset();
+  self->_relocations.reset();
+  self->_labelEntries.reset();
+  self->_sections.reset();
+
+  self->_unresolvedLinkCount = 0;
+  self->_addressTableSection = nullptr;
+  self->_addressTableEntries.reset();
+
+  allocator->reset(&self->_zone);
+  self->_zone.reset(resetPolicy);
+}
+
+static void CodeHolder_onSettingsUpdated(CodeHolder* self) noexcept {
+  // Notify all attached emitters about a settings update.
+  for (BaseEmitter* emitter : self->emitters()) {
+    emitter->onSettingsUpdated();
+  }
+}
+
+// ============================================================================
+// [asmjit::CodeHolder - Construction / Destruction]
+// ============================================================================
+
+CodeHolder::CodeHolder() noexcept
+  : _environment(),
+    _baseAddress(Globals::kNoBaseAddress),
+    _logger(nullptr),
+    _errorHandler(nullptr),
+    _zone(16384 - Zone::kBlockOverhead),
+    _allocator(&_zone),
+    _unresolvedLinkCount(0),
+    _addressTableSection(nullptr) {}
+
+CodeHolder::~CodeHolder() noexcept {
+  CodeHolder_resetInternal(this, Globals::kResetHard);
+}
+
+// ============================================================================
+// [asmjit::CodeHolder - Init / Reset]
+// ============================================================================
+
+inline void CodeHolder_setSectionDefaultName(
+  Section* section,
+  char c0 = 0, char c1 = 0, char c2 = 0, char c3 = 0,
+  char c4 = 0, char c5 = 0, char c6 = 0, char c7 = 0) noexcept {
+
+  section->_name.u32[0] = Support::bytepack32_4x8(uint8_t(c0), uint8_t(c1), uint8_t(c2), uint8_t(c3));
+  section->_name.u32[1] = Support::bytepack32_4x8(uint8_t(c4), uint8_t(c5), uint8_t(c6), uint8_t(c7));
+}
+
+Error CodeHolder::init(const Environment& environment, uint64_t baseAddress) noexcept {
+  // Cannot reinitialize if it's locked or there is one or more emitter attached.
+  if (isInitialized())
+    return DebugUtils::errored(kErrorAlreadyInitialized);
+
+  // If we are just initializing there should be no emitters attached.
+  ASMJIT_ASSERT(_emitters.empty());
+
+  // Create a default section and insert it to the `_sections` array.
+  Error err = _sections.willGrow(&_allocator);
+  if (err == kErrorOk) {
+    Section* section = _allocator.allocZeroedT<Section>();
+    if (ASMJIT_LIKELY(section)) {
+      section->_flags = Section::kFlagExec | Section::kFlagConst;
+      CodeHolder_setSectionDefaultName(section, '.', 't', 'e', 'x', 't');
+      _sections.appendUnsafe(section);
+    }
+    else {
+      err = DebugUtils::errored(kErrorOutOfMemory);
+    }
+  }
+
+  if (ASMJIT_UNLIKELY(err)) {
+    _zone.reset();
+    return err;
+  }
+  else {
+    _environment = environment;
+    _baseAddress = baseAddress;
+    return kErrorOk;
+  }
+}
+
+void CodeHolder::reset(uint32_t resetPolicy) noexcept {
+  CodeHolder_resetInternal(this, resetPolicy);
+}
+
+// ============================================================================
+// [asmjit::CodeHolder - Attach / Detach]
+// ============================================================================
+
+Error CodeHolder::attach(BaseEmitter* emitter) noexcept {
+  // Catch a possible misuse of the API.
+  if (ASMJIT_UNLIKELY(!emitter))
+    return DebugUtils::errored(kErrorInvalidArgument);
+
+  // Invalid emitter, this should not be possible.
+  uint32_t type = emitter->emitterType();
+  if (ASMJIT_UNLIKELY(type == BaseEmitter::kTypeNone || type >= BaseEmitter::kTypeCount))
+    return DebugUtils::errored(kErrorInvalidState);
+
+  // This is suspicious, but don't fail if `emitter` is already attached
+  // to this code holder. This is not error, but it's not recommended.
+  if (emitter->_code != nullptr) {
+    if (emitter->_code == this)
+      return kErrorOk;
+    return DebugUtils::errored(kErrorInvalidState);
+  }
+
+  // Reserve the space now as we cannot fail after `onAttach()` succeeded.
+  ASMJIT_PROPAGATE(_emitters.willGrow(&_allocator, 1));
+  ASMJIT_PROPAGATE(emitter->onAttach(this));
+
+  // Connect CodeHolder <-> BaseEmitter.
+  ASMJIT_ASSERT(emitter->_code == this);
+  _emitters.appendUnsafe(emitter);
+
+  return kErrorOk;
+}
+
+Error CodeHolder::detach(BaseEmitter* emitter) noexcept {
+  if (ASMJIT_UNLIKELY(!emitter))
+    return DebugUtils::errored(kErrorInvalidArgument);
+
+  if (ASMJIT_UNLIKELY(emitter->_code != this))
+    return DebugUtils::errored(kErrorInvalidState);
+
+  // NOTE: We always detach if we were asked to, if error happens during
+  // `emitter->onDetach()` we just propagate it, but the BaseEmitter will
+  // be detached.
+  Error err = kErrorOk;
+  if (!emitter->isDestroyed())
+    err = emitter->onDetach(this);
+
+  // Disconnect CodeHolder <-> BaseEmitter.
+  uint32_t index = _emitters.indexOf(emitter);
+  ASMJIT_ASSERT(index != Globals::kNotFound);
+
+  _emitters.removeAt(index);
+  emitter->_code = nullptr;
+
+  return err;
+}
+
+// ============================================================================
+// [asmjit::CodeHolder - Logging]
+// ============================================================================
+
+void CodeHolder::setLogger(Logger* logger) noexcept {
+#ifndef ASMJIT_NO_LOGGING
+  _logger = logger;
+  CodeHolder_onSettingsUpdated(this);
+#else
+  DebugUtils::unused(logger);
+#endif
+}
+
+// ============================================================================
+// [asmjit::CodeHolder - Error Handling]
+// ============================================================================
+
+void CodeHolder::setErrorHandler(ErrorHandler* errorHandler) noexcept {
+  _errorHandler = errorHandler;
+  CodeHolder_onSettingsUpdated(this);
+}
+
+// ============================================================================
+// [asmjit::CodeHolder - Code Buffer]
+// ============================================================================
+
+static Error CodeHolder_reserveInternal(CodeHolder* self, CodeBuffer* cb, size_t n) noexcept {
+  uint8_t* oldData = cb->_data;
+  uint8_t* newData;
+
+  if (oldData && !cb->isExternal())
+    newData = static_cast<uint8_t*>(::realloc(oldData, n));
+  else
+    newData = static_cast<uint8_t*>(::malloc(n));
+
+  if (ASMJIT_UNLIKELY(!newData))
+    return DebugUtils::errored(kErrorOutOfMemory);
+
+  cb->_data = newData;
+  cb->_capacity = n;
+
+  // Update pointers used by assemblers, if attached.
+  for (BaseEmitter* emitter : self->emitters()) {
+    if (emitter->isAssembler()) {
+      BaseAssembler* a = static_cast<BaseAssembler*>(emitter);
+      if (&a->_section->_buffer == cb) {
+        size_t offset = a->offset();
+
+        a->_bufferData = newData;
+        a->_bufferEnd  = newData + n;
+        a->_bufferPtr  = newData + offset;
+      }
+    }
+  }
+
+  return kErrorOk;
+}
+
+Error CodeHolder::growBuffer(CodeBuffer* cb, size_t n) noexcept {
+  // The size of the section must be valid.
+  size_t size = cb->size();
+  if (ASMJIT_UNLIKELY(n > std::numeric_limits<uintptr_t>::max() - size))
+    return DebugUtils::errored(kErrorOutOfMemory);
+
+  // We can now check if growing the buffer is really necessary. It's unlikely
+  // that this function is called while there is still room for `n` bytes.
+  size_t capacity = cb->capacity();
+  size_t required = cb->size() + n;
+  if (ASMJIT_UNLIKELY(required <= capacity))
+    return kErrorOk;
+
+  if (cb->isFixed())
+    return DebugUtils::errored(kErrorTooLarge);
+
+  size_t kInitialCapacity = 8096;
+  if (capacity < kInitialCapacity)
+    capacity = kInitialCapacity;
+  else
+    capacity += Globals::kAllocOverhead;
+
+  do {
+    size_t old = capacity;
+    if (capacity < Globals::kGrowThreshold)
+      capacity *= 2;
+    else
+      capacity += Globals::kGrowThreshold;
+
+    // Overflow.
+    if (ASMJIT_UNLIKELY(old > capacity))
+      return DebugUtils::errored(kErrorOutOfMemory);
+  } while (capacity - Globals::kAllocOverhead < required);
+
+  return CodeHolder_reserveInternal(this, cb, capacity - Globals::kAllocOverhead);
+}
+
+Error CodeHolder::reserveBuffer(CodeBuffer* cb, size_t n) noexcept {
+  size_t capacity = cb->capacity();
+
+  if (n <= capacity)
+    return kErrorOk;
+
+  if (cb->isFixed())
+    return DebugUtils::errored(kErrorTooLarge);
+
+  return CodeHolder_reserveInternal(this, cb, n);
+}
+
+// ============================================================================
+// [asmjit::CodeHolder - Sections]
+// ============================================================================
+
+Error CodeHolder::newSection(Section** sectionOut, const char* name, size_t nameSize, uint32_t flags, uint32_t alignment) noexcept {
+  *sectionOut = nullptr;
+
+  if (nameSize == SIZE_MAX)
+    nameSize = strlen(name);
+
+  if (alignment == 0)
+    alignment = 1;
+
+  if (ASMJIT_UNLIKELY(!Support::isPowerOf2(alignment)))
+    return DebugUtils::errored(kErrorInvalidArgument);
+
+  if (ASMJIT_UNLIKELY(nameSize > Globals::kMaxSectionNameSize))
+    return DebugUtils::errored(kErrorInvalidSectionName);
+
+  uint32_t sectionId = _sections.size();
+  if (ASMJIT_UNLIKELY(sectionId == Globals::kInvalidId))
+    return DebugUtils::errored(kErrorTooManySections);
+
+  ASMJIT_PROPAGATE(_sections.willGrow(&_allocator));
+  Section* section = _allocator.allocZeroedT<Section>();
+
+  if (ASMJIT_UNLIKELY(!section))
+    return DebugUtils::errored(kErrorOutOfMemory);
+
+  section->_id = sectionId;
+  section->_flags = flags;
+  section->_alignment = alignment;
+  memcpy(section->_name.str, name, nameSize);
+  _sections.appendUnsafe(section);
+
+  *sectionOut = section;
+  return kErrorOk;
+}
+
+Section* CodeHolder::sectionByName(const char* name, size_t nameSize) const noexcept {
+  if (nameSize == SIZE_MAX)
+    nameSize = strlen(name);
+
+  // This could be also put in a hash-table similarly like we do with labels,
+  // however it's questionable as the number of sections should be pretty low
+  // in general. Create an issue if this becomes a problem.
+  if (nameSize <= Globals::kMaxSectionNameSize) {
+    for (Section* section : _sections)
+      if (memcmp(section->_name.str, name, nameSize) == 0 && section->_name.str[nameSize] == '\0')
+        return section;
+  }
+
+  return nullptr;
+}
+
+Section* CodeHolder::ensureAddressTableSection() noexcept {
+  if (_addressTableSection)
+    return _addressTableSection;
+
+  newSection(&_addressTableSection, CodeHolder_addrTabName, sizeof(CodeHolder_addrTabName) - 1, 0, _environment.registerSize());
+  return _addressTableSection;
+}
+
+Error CodeHolder::addAddressToAddressTable(uint64_t address) noexcept {
+  AddressTableEntry* entry = _addressTableEntries.get(address);
+  if (entry)
+    return kErrorOk;
+
+  Section* section = ensureAddressTableSection();
+  if (ASMJIT_UNLIKELY(!section))
+    return DebugUtils::errored(kErrorOutOfMemory);
+
+  entry = _zone.newT<AddressTableEntry>(address);
+  if (ASMJIT_UNLIKELY(!entry))
+    return DebugUtils::errored(kErrorOutOfMemory);
+
+  _addressTableEntries.insert(entry);
+  section->_virtualSize += _environment.registerSize();
+
+  return kErrorOk;
+}
+
+// ============================================================================
+// [asmjit::CodeHolder - Labels / Symbols]
+// ============================================================================
+
+//! Only used to lookup a label from `_namedLabels`.
+class LabelByName {
+public:
+  inline LabelByName(const char* key, size_t keySize, uint32_t hashCode, uint32_t parentId) noexcept
+    : _key(key),
+      _keySize(uint32_t(keySize)),
+      _hashCode(hashCode),
+      _parentId(parentId) {}
+
+  inline uint32_t hashCode() const noexcept { return _hashCode; }
+
+  inline bool matches(const LabelEntry* entry) const noexcept {
+    return entry->nameSize() == _keySize &&
+           entry->parentId() == _parentId &&
+           ::memcmp(entry->name(), _key, _keySize) == 0;
+  }
+
+  const char* _key;
+  uint32_t _keySize;
+  uint32_t _hashCode;
+  uint32_t _parentId;
+};
+
+// Returns a hash of `name` and fixes `nameSize` if it's `SIZE_MAX`.
+static uint32_t CodeHolder_hashNameAndGetSize(const char* name, size_t& nameSize) noexcept {
+  uint32_t hashCode = 0;
+  if (nameSize == SIZE_MAX) {
+    size_t i = 0;
+    for (;;) {
+      uint8_t c = uint8_t(name[i]);
+      if (!c) break;
+      hashCode = Support::hashRound(hashCode, c);
+      i++;
+    }
+    nameSize = i;
+  }
+  else {
+    for (size_t i = 0; i < nameSize; i++) {
+      uint8_t c = uint8_t(name[i]);
+      if (ASMJIT_UNLIKELY(!c)) return DebugUtils::errored(kErrorInvalidLabelName);
+      hashCode = Support::hashRound(hashCode, c);
+    }
+  }
+  return hashCode;
+}
+
+static bool CodeHolder_writeDisplacement(void* dst, int64_t displacement, uint32_t displacementSize) {
+  if (displacementSize == 4 && Support::isInt32(displacement)) {
+    Support::writeI32uLE(dst, int32_t(displacement));
+    return true;
+  }
+  else if (displacementSize == 1 && Support::isInt8(displacement)) {
+    Support::writeI8(dst, int8_t(displacement));
+    return true;
+  }
+
+  return false;
+}
+
+LabelLink* CodeHolder::newLabelLink(LabelEntry* le, uint32_t sectionId, size_t offset, intptr_t rel) noexcept {
+  LabelLink* link = _allocator.allocT<LabelLink>();
+  if (ASMJIT_UNLIKELY(!link)) return nullptr;
+
+  link->next = le->_links;
+  le->_links = link;
+
+  link->sectionId = sectionId;
+  link->relocId = Globals::kInvalidId;
+  link->offset = offset;
+  link->rel = rel;
+
+  _unresolvedLinkCount++;
+  return link;
+}
+
+Error CodeHolder::newLabelEntry(LabelEntry** entryOut) noexcept {
+  *entryOut = nullptr;
+
+  uint32_t labelId = _labelEntries.size();
+  if (ASMJIT_UNLIKELY(labelId == Globals::kInvalidId))
+    return DebugUtils::errored(kErrorTooManyLabels);
+
+  ASMJIT_PROPAGATE(_labelEntries.willGrow(&_allocator));
+  LabelEntry* le = _allocator.allocZeroedT<LabelEntry>();
+
+  if (ASMJIT_UNLIKELY(!le))
+    return DebugUtils::errored(kErrorOutOfMemory);
+
+  le->_setId(labelId);
+  le->_parentId = Globals::kInvalidId;
+  le->_offset = 0;
+  _labelEntries.appendUnsafe(le);
+
+  *entryOut = le;
+  return kErrorOk;
+}
+
+Error CodeHolder::newNamedLabelEntry(LabelEntry** entryOut, const char* name, size_t nameSize, uint32_t type, uint32_t parentId) noexcept {
+  *entryOut = nullptr;
+  uint32_t hashCode = CodeHolder_hashNameAndGetSize(name, nameSize);
+
+  if (ASMJIT_UNLIKELY(nameSize == 0))
+    return DebugUtils::errored(kErrorInvalidLabelName);
+
+  if (ASMJIT_UNLIKELY(nameSize > Globals::kMaxLabelNameSize))
+    return DebugUtils::errored(kErrorLabelNameTooLong);
+
+  switch (type) {
+    case Label::kTypeLocal:
+      if (ASMJIT_UNLIKELY(parentId >= _labelEntries.size()))
+        return DebugUtils::errored(kErrorInvalidParentLabel);
+
+      hashCode ^= parentId;
+      break;
+
+    case Label::kTypeGlobal:
+      if (ASMJIT_UNLIKELY(parentId != Globals::kInvalidId))
+        return DebugUtils::errored(kErrorNonLocalLabelCannotHaveParent);
+
+      break;
+
+    default:
+      return DebugUtils::errored(kErrorInvalidArgument);
+  }
+
+  // Don't allow to insert duplicates. Local labels allow duplicates that have
+  // different id, this is already accomplished by having a different hashes
+  // between the same label names having different parent labels.
+  LabelEntry* le = _namedLabels.get(LabelByName(name, nameSize, hashCode, parentId));
+  if (ASMJIT_UNLIKELY(le))
+    return DebugUtils::errored(kErrorLabelAlreadyDefined);
+
+  Error err = kErrorOk;
+  uint32_t labelId = _labelEntries.size();
+
+  if (ASMJIT_UNLIKELY(labelId == Globals::kInvalidId))
+    return DebugUtils::errored(kErrorTooManyLabels);
+
+  ASMJIT_PROPAGATE(_labelEntries.willGrow(&_allocator));
+  le = _allocator.allocZeroedT<LabelEntry>();
+
+  if (ASMJIT_UNLIKELY(!le))
+    return DebugUtils::errored(kErrorOutOfMemory);
+
+  le->_hashCode = hashCode;
+  le->_setId(labelId);
+  le->_type = uint8_t(type);
+  le->_parentId = parentId;
+  le->_offset = 0;
+  ASMJIT_PROPAGATE(le->_name.setData(&_zone, name, nameSize));
+
+  _labelEntries.appendUnsafe(le);
+  _namedLabels.insert(allocator(), le);
+
+  *entryOut = le;
+  return err;
+}
+
+uint32_t CodeHolder::labelIdByName(const char* name, size_t nameSize, uint32_t parentId) noexcept {
+  uint32_t hashCode = CodeHolder_hashNameAndGetSize(name, nameSize);
+  if (ASMJIT_UNLIKELY(!nameSize))
+    return 0;
+
+  if (parentId != Globals::kInvalidId)
+    hashCode ^= parentId;
+
+  LabelEntry* le = _namedLabels.get(LabelByName(name, nameSize, hashCode, parentId));
+  return le ? le->id() : uint32_t(Globals::kInvalidId);
+}
+
+ASMJIT_API Error CodeHolder::resolveUnresolvedLinks() noexcept {
+  if (!hasUnresolvedLinks())
+    return kErrorOk;
+
+  Error err = kErrorOk;
+  for (LabelEntry* le : labelEntries()) {
+    if (!le->isBound())
+      continue;
+
+    LabelLinkIterator link(le);
+    if (link) {
+      Support::FastUInt8 of = 0;
+      Section* toSection = le->section();
+      uint64_t toOffset = Support::addOverflow(toSection->offset(), le->offset(), &of);
+
+      do {
+        uint32_t linkSectionId = link->sectionId;
+        if (link->relocId == Globals::kInvalidId) {
+          Section* fromSection = sectionById(linkSectionId);
+          size_t linkOffset = link->offset;
+
+          CodeBuffer& buf = _sections[linkSectionId]->buffer();
+          ASMJIT_ASSERT(linkOffset < buf.size());
+
+          // Calculate the offset relative to the start of the virtual base.
+          uint64_t fromOffset = Support::addOverflow<uint64_t>(fromSection->offset(), linkOffset, &of);
+          int64_t displacement = int64_t(toOffset - fromOffset + uint64_t(int64_t(link->rel)));
+
+          if (!of) {
+            ASMJIT_ASSERT(size_t(linkOffset) < buf.size());
+
+            // Size of the value we are going to patch. Only BYTE/DWORD is allowed.
+            uint32_t displacementSize = buf._data[linkOffset];
+            ASMJIT_ASSERT(buf.size() - size_t(linkOffset) >= displacementSize);
+
+            // Overwrite a real displacement in the CodeBuffer.
+            if (CodeHolder_writeDisplacement(buf._data + linkOffset, displacement, displacementSize)) {
+              link.resolveAndNext(this);
+              continue;
+            }
+          }
+
+          err = DebugUtils::errored(kErrorInvalidDisplacement);
+          // Falls through to `link.next()`.
+        }
+
+        link.next();
+      } while (link);
+    }
+  }
+
+  return err;
+}
+
+ASMJIT_API Error CodeHolder::bindLabel(const Label& label, uint32_t toSectionId, uint64_t toOffset) noexcept {
+  LabelEntry* le = labelEntry(label);
+  if (ASMJIT_UNLIKELY(!le))
+    return DebugUtils::errored(kErrorInvalidLabel);
+
+  if (ASMJIT_UNLIKELY(toSectionId > _sections.size()))
+    return DebugUtils::errored(kErrorInvalidSection);
+
+  // Label can be bound only once.
+  if (ASMJIT_UNLIKELY(le->isBound()))
+    return DebugUtils::errored(kErrorLabelAlreadyBound);
+
+  // Bind the label.
+  Section* section = _sections[toSectionId];
+  le->_section = section;
+  le->_offset = toOffset;
+
+  Error err = kErrorOk;
+  CodeBuffer& buf = section->buffer();
+
+  // Fix all links to this label we have collected so far if they are within
+  // the same section. We ignore any inter-section links as these have to be
+  // fixed later.
+  LabelLinkIterator link(le);
+  while (link) {
+    uint32_t linkSectionId = link->sectionId;
+    size_t linkOffset = link->offset;
+
+    uint32_t relocId = link->relocId;
+    if (relocId != Globals::kInvalidId) {
+      // Adjust relocation data only.
+      RelocEntry* re = _relocations[relocId];
+      re->_payload += toOffset;
+      re->_targetSectionId = toSectionId;
+    }
+    else {
+      if (linkSectionId != toSectionId) {
+        link.next();
+        continue;
+      }
+
+      ASMJIT_ASSERT(linkOffset < buf.size());
+      int64_t displacement = int64_t(toOffset - uint64_t(linkOffset) + uint64_t(int64_t(link->rel)));
+
+      // Size of the value we are going to patch. Only BYTE/DWORD is allowed.
+      uint32_t displacementSize = buf._data[linkOffset];
+      ASMJIT_ASSERT(buf.size() - size_t(linkOffset) >= displacementSize);
+
+      // Overwrite a real displacement in the CodeBuffer.
+      if (!CodeHolder_writeDisplacement(buf._data + linkOffset, displacement, displacementSize)) {
+        err = DebugUtils::errored(kErrorInvalidDisplacement);
+        link.next();
+        continue;
+      }
+    }
+
+    link.resolveAndNext(this);
+  }
+
+  return err;
+}
+
+// ============================================================================
+// [asmjit::BaseEmitter - Relocations]
+// ============================================================================
+
+Error CodeHolder::newRelocEntry(RelocEntry** dst, uint32_t relocType, uint32_t valueSize) noexcept {
+  ASMJIT_PROPAGATE(_relocations.willGrow(&_allocator));
+
+  uint32_t relocId = _relocations.size();
+  if (ASMJIT_UNLIKELY(relocId == Globals::kInvalidId))
+    return DebugUtils::errored(kErrorTooManyRelocations);
+
+  RelocEntry* re = _allocator.allocZeroedT<RelocEntry>();
+  if (ASMJIT_UNLIKELY(!re))
+    return DebugUtils::errored(kErrorOutOfMemory);
+
+  re->_id = relocId;
+  re->_relocType = uint8_t(relocType);
+  re->_valueSize = uint8_t(valueSize);
+  re->_sourceSectionId = Globals::kInvalidId;
+  re->_targetSectionId = Globals::kInvalidId;
+  _relocations.appendUnsafe(re);
+
+  *dst = re;
+  return kErrorOk;
+}
+
+// ============================================================================
+// [asmjit::BaseEmitter - Expression Evaluation]
+// ============================================================================
+
+static Error CodeHolder_evaluateExpression(CodeHolder* self, Expression* exp, uint64_t* out) noexcept {
+  uint64_t value[2];
+  for (size_t i = 0; i < 2; i++) {
+    uint64_t v;
+    switch (exp->valueType[i]) {
+      case Expression::kValueNone: {
+        v = 0;
+        break;
+      }
+
+      case Expression::kValueConstant: {
+        v = exp->value[i].constant;
+        break;
+      }
+
+      case Expression::kValueLabel: {
+        LabelEntry* le = exp->value[i].label;
+        if (!le->isBound())
+          return DebugUtils::errored(kErrorExpressionLabelNotBound);
+        v = le->section()->offset() + le->offset();
+        break;
+      }
+
+      case Expression::kValueExpression: {
+        Expression* nested = exp->value[i].expression;
+        ASMJIT_PROPAGATE(CodeHolder_evaluateExpression(self, nested, &v));
+        break;
+      }
+
+      default:
+        return DebugUtils::errored(kErrorInvalidState);
+    }
+
+    value[i] = v;
+  }
+
+  uint64_t result;
+  uint64_t& a = value[0];
+  uint64_t& b = value[1];
+
+  switch (exp->opType) {
+    case Expression::kOpAdd:
+      result = a + b;
+      break;
+
+    case Expression::kOpSub:
+      result = a - b;
+      break;
+
+    case Expression::kOpMul:
+      result = a * b;
+      break;
+
+    case Expression::kOpSll:
+      result = (b > 63) ? uint64_t(0) : uint64_t(a << b);
+      break;
+
+    case Expression::kOpSrl:
+      result = (b > 63) ? uint64_t(0) : uint64_t(a >> b);
+      break;
+
+    case Expression::kOpSra:
+      result = Support::sar(a, Support::min<uint64_t>(b, 63));
+      break;
+
+    default:
+      return DebugUtils::errored(kErrorInvalidState);
+  }
+
+  *out = result;
+  return kErrorOk;
+}
+
+// ============================================================================
+// [asmjit::BaseEmitter - Utilities]
+// ============================================================================
+
+Error CodeHolder::flatten() noexcept {
+  uint64_t offset = 0;
+  for (Section* section : _sections) {
+    uint64_t realSize = section->realSize();
+    if (realSize) {
+      uint64_t alignedOffset = Support::alignUp(offset, section->alignment());
+      if (ASMJIT_UNLIKELY(alignedOffset < offset))
+        return DebugUtils::errored(kErrorTooLarge);
+
+      Support::FastUInt8 of = 0;
+      offset = Support::addOverflow(alignedOffset, realSize, &of);
+
+      if (ASMJIT_UNLIKELY(of))
+        return DebugUtils::errored(kErrorTooLarge);
+    }
+  }
+
+  // Now we know that we can assign offsets of all sections properly.
+  Section* prev = nullptr;
+  offset = 0;
+  for (Section* section : _sections) {
+    uint64_t realSize = section->realSize();
+    if (realSize)
+      offset = Support::alignUp(offset, section->alignment());
+    section->_offset = offset;
+
+    // Make sure the previous section extends a bit to cover the alignment.
+    if (prev)
+      prev->_virtualSize = offset - prev->_offset;
+
+    prev = section;
+    offset += realSize;
+  }
+
+  return kErrorOk;
+}
+
+size_t CodeHolder::codeSize() const noexcept {
+  Support::FastUInt8 of = 0;
+  uint64_t offset = 0;
+
+  for (Section* section : _sections) {
+    uint64_t realSize = section->realSize();
+
+    if (realSize) {
+      uint64_t alignedOffset = Support::alignUp(offset, section->alignment());
+      ASMJIT_ASSERT(alignedOffset >= offset);
+      offset = Support::addOverflow(alignedOffset, realSize, &of);
+    }
+  }
+
+  if ((sizeof(uint64_t) > sizeof(size_t) && offset > SIZE_MAX) || of)
+    return SIZE_MAX;
+
+  return size_t(offset);
+}
+
+Error CodeHolder::relocateToBase(uint64_t baseAddress) noexcept {
+  // Base address must be provided.
+  if (ASMJIT_UNLIKELY(baseAddress == Globals::kNoBaseAddress))
+    return DebugUtils::errored(kErrorInvalidArgument);
+
+  _baseAddress = baseAddress;
+  uint32_t addressSize = _environment.registerSize();
+
+  Section* addressTableSection = _addressTableSection;
+  uint32_t addressTableEntryCount = 0;
+  uint8_t* addressTableEntryData = nullptr;
+
+  if (addressTableSection) {
+    ASMJIT_PROPAGATE(
+      reserveBuffer(&addressTableSection->_buffer, size_t(addressTableSection->virtualSize())));
+    addressTableEntryData = addressTableSection->_buffer.data();
+  }
+
+  // Relocate all recorded locations.
+  for (const RelocEntry* re : _relocations) {
+    // Possibly deleted or optimized-out entry.
+    if (re->relocType() == RelocEntry::kTypeNone)
+      continue;
+
+    Section* sourceSection = sectionById(re->sourceSectionId());
+    Section* targetSection = nullptr;
+
+    if (re->targetSectionId() != Globals::kInvalidId)
+      targetSection = sectionById(re->targetSectionId());
+
+    uint64_t value = re->payload();
+    uint64_t sectionOffset = sourceSection->offset();
+    uint64_t sourceOffset = re->sourceOffset();
+
+    // Make sure that the `RelocEntry` doesn't go out of bounds.
+    size_t regionSize = re->leadingSize() + re->valueSize() + re->trailingSize();
+    if (ASMJIT_UNLIKELY(re->sourceOffset() >= sourceSection->bufferSize() ||
+                        sourceSection->bufferSize() - size_t(re->sourceOffset()) < regionSize))
+      return DebugUtils::errored(kErrorInvalidRelocEntry);
+
+    uint8_t* buffer = sourceSection->data();
+    size_t valueOffset = size_t(re->sourceOffset()) + re->leadingSize();
+
+    switch (re->relocType()) {
+      case RelocEntry::kTypeExpression: {
+        Expression* expression = (Expression*)(uintptr_t(value));
+        ASMJIT_PROPAGATE(CodeHolder_evaluateExpression(this, expression, &value));
+        break;
+      }
+
+      case RelocEntry::kTypeAbsToAbs: {
+        break;
+      }
+
+      case RelocEntry::kTypeRelToAbs: {
+        // Value is currently a relative offset from the start of its section.
+        // We have to convert it to an absolute offset (including base address).
+        if (ASMJIT_UNLIKELY(!targetSection))
+          return DebugUtils::errored(kErrorInvalidRelocEntry);
+
+        //value += baseAddress + sectionOffset + sourceOffset + regionSize;
+        value += baseAddress + targetSection->offset();
+        break;
+      }
+
+      case RelocEntry::kTypeAbsToRel: {
+        value -= baseAddress + sectionOffset + sourceOffset + regionSize;
+        if (addressSize > 4 && !Support::isInt32(int64_t(value)))
+          return DebugUtils::errored(kErrorRelocOffsetOutOfRange);
+        break;
+      }
+
+      case RelocEntry::kTypeX64AddressEntry: {
+        if (re->valueSize() != 4 || re->leadingSize() < 2)
+          return DebugUtils::errored(kErrorInvalidRelocEntry);
+
+        // First try whether a relative 32-bit displacement would work.
+        value -= baseAddress + sectionOffset + sourceOffset + regionSize;
+        if (!Support::isInt32(int64_t(value))) {
+          // Relative 32-bit displacement is not possible, use '.addrtab' section.
+          AddressTableEntry* atEntry = _addressTableEntries.get(re->payload());
+          if (ASMJIT_UNLIKELY(!atEntry))
+            return DebugUtils::errored(kErrorInvalidRelocEntry);
+
+          // Cannot be null as we have just matched the `AddressTableEntry`.
+          ASMJIT_ASSERT(addressTableSection != nullptr);
+
+          if (!atEntry->hasAssignedSlot())
+            atEntry->_slot = addressTableEntryCount++;
+
+          size_t atEntryIndex = size_t(atEntry->slot()) * addressSize;
+          uint64_t addrSrc = sectionOffset + sourceOffset + regionSize;
+          uint64_t addrDst = addressTableSection->offset() + uint64_t(atEntryIndex);
+
+          value = addrDst - addrSrc;
+          if (!Support::isInt32(int64_t(value)))
+            return DebugUtils::errored(kErrorRelocOffsetOutOfRange);
+
+          // Bytes that replace [REX, OPCODE] bytes.
+          uint32_t byte0 = 0xFF;
+          uint32_t byte1 = buffer[valueOffset - 1];
+
+          if (byte1 == 0xE8) {
+            // Patch CALL/MOD byte to FF /2 (-> 0x15).
+            byte1 = x86EncodeMod(0, 2, 5);
+          }
+          else if (byte1 == 0xE9) {
+            // Patch JMP/MOD byte to FF /4 (-> 0x25).
+            byte1 = x86EncodeMod(0, 4, 5);
+          }
+          else {
+            return DebugUtils::errored(kErrorInvalidRelocEntry);
+          }
+
+          // Patch `jmp/call` instruction.
+          buffer[valueOffset - 2] = uint8_t(byte0);
+          buffer[valueOffset - 1] = uint8_t(byte1);
+
+          Support::writeU64uLE(addressTableEntryData + atEntryIndex, re->payload());
+        }
+        break;
+      }
+
+      default:
+        return DebugUtils::errored(kErrorInvalidRelocEntry);
+    }
+
+    switch (re->valueSize()) {
+      case 1:
+        Support::writeU8(buffer + valueOffset, uint32_t(value & 0xFFu));
+        break;
+
+      case 2:
+        Support::writeU16uLE(buffer + valueOffset, uint32_t(value & 0xFFFFu));
+        break;
+
+      case 4:
+        Support::writeU32uLE(buffer + valueOffset, uint32_t(value & 0xFFFFFFFFu));
+        break;
+
+      case 8:
+        Support::writeU64uLE(buffer + valueOffset, value);
+        break;
+
+      default:
+        return DebugUtils::errored(kErrorInvalidRelocEntry);
+    }
+  }
+
+  // Fixup the virtual size of the address table if it's the last section.
+  if (_sections.last() == addressTableSection) {
+    size_t addressTableSize = addressTableEntryCount * addressSize;
+    addressTableSection->_buffer._size = addressTableSize;
+    addressTableSection->_virtualSize = addressTableSize;
+  }
+
+  return kErrorOk;
+}
+
+Error CodeHolder::copySectionData(void* dst, size_t dstSize, uint32_t sectionId, uint32_t copyOptions) noexcept {
+  if (ASMJIT_UNLIKELY(!isSectionValid(sectionId)))
+    return DebugUtils::errored(kErrorInvalidSection);
+
+  Section* section = sectionById(sectionId);
+  size_t bufferSize = section->bufferSize();
+
+  if (ASMJIT_UNLIKELY(dstSize < bufferSize))
+    return DebugUtils::errored(kErrorInvalidArgument);
+
+  memcpy(dst, section->data(), bufferSize);
+
+  if (bufferSize < dstSize && (copyOptions & kCopyPadSectionBuffer)) {
+    size_t paddingSize = dstSize - bufferSize;
+    memset(static_cast<uint8_t*>(dst) + bufferSize, 0, paddingSize);
+  }
+
+  return kErrorOk;
+}
+
+Error CodeHolder::copyFlattenedData(void* dst, size_t dstSize, uint32_t copyOptions) noexcept {
+  size_t end = 0;
+  for (Section* section : _sections) {
+    if (section->offset() > dstSize)
+      return DebugUtils::errored(kErrorInvalidArgument);
+
+    size_t bufferSize = section->bufferSize();
+    size_t offset = size_t(section->offset());
+
+    if (ASMJIT_UNLIKELY(dstSize - offset < bufferSize))
+      return DebugUtils::errored(kErrorInvalidArgument);
+
+    uint8_t* dstTarget = static_cast<uint8_t*>(dst) + offset;
+    size_t paddingSize = 0;
+    memcpy(dstTarget, section->data(), bufferSize);
+
+    if ((copyOptions & kCopyPadSectionBuffer) && bufferSize < section->virtualSize()) {
+      paddingSize = Support::min<size_t>(dstSize - offset, size_t(section->virtualSize())) - bufferSize;
+      memset(dstTarget + bufferSize, 0, paddingSize);
+    }
+
+    end = Support::max(end, offset + bufferSize + paddingSize);
+  }
+
+  if (end < dstSize && (copyOptions & kCopyPadTargetBuffer)) {
+    memset(static_cast<uint8_t*>(dst) + end, 0, dstSize - end);
+  }
+
+  return kErrorOk;
+}
+
+ASMJIT_END_NAMESPACE