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Current Path: /usr/src/contrib/llvm-project/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime

usr / src / contrib / llvm-project / lldb / source / Plugins / LanguageRuntime / ObjC / AppleObjCRuntime /

📁 ..
📄 AppleObjCClassDescriptorV2.cpp(18.71 KB)
📄 AppleObjCClassDescriptorV2.h(9.46 KB)
📄 AppleObjCDeclVendor.cpp(18.51 KB)
📄 AppleObjCDeclVendor.h(1.79 KB)
📄 AppleObjCRuntime.cpp(21.67 KB)
📄 AppleObjCRuntime.h(4.45 KB)
📄 AppleObjCRuntimeV1.cpp(15.06 KB)
📄 AppleObjCRuntimeV1.h(4.69 KB)
📄 AppleObjCRuntimeV2.cpp(97.81 KB)
📄 AppleObjCRuntimeV2.h(11.96 KB)
📄 AppleObjCTrampolineHandler.cpp(54.92 KB)
📄 AppleObjCTrampolineHandler.h(5.27 KB)
📄 AppleObjCTypeEncodingParser.cpp(12.24 KB)
📄 AppleObjCTypeEncodingParser.h(2.62 KB)
📄 AppleThreadPlanStepThroughObjCTrampoline.cpp(15.81 KB)
📄 AppleThreadPlanStepThroughObjCTrampoline.h(4.47 KB)

Editing: AppleObjCClassDescriptorV2.h

//===-- AppleObjCClassDescriptorV2.h ----------------------------*- 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
//
//===----------------------------------------------------------------------===//

#ifndef LLDB_SOURCE_PLUGINS_LANGUAGERUNTIME_OBJC_APPLEOBJCRUNTIME_APPLEOBJCCLASSDESCRIPTORV2_H
#define LLDB_SOURCE_PLUGINS_LANGUAGERUNTIME_OBJC_APPLEOBJCRUNTIME_APPLEOBJCCLASSDESCRIPTORV2_H

#include <mutex>

#include "AppleObjCRuntimeV2.h"
#include "lldb/lldb-private.h"

#include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"

namespace lldb_private {

class ClassDescriptorV2 : public ObjCLanguageRuntime::ClassDescriptor {
public:
  friend class lldb_private::AppleObjCRuntimeV2;

~ClassDescriptorV2() override = default;

ConstString GetClassName() override;

ObjCLanguageRuntime::ClassDescriptorSP GetSuperclass() override;

ObjCLanguageRuntime::ClassDescriptorSP GetMetaclass() const override;

bool IsValid() override {
    return true; // any Objective-C v2 runtime class descriptor we vend is valid
  }

// a custom descriptor is used for tagged pointers
  bool GetTaggedPointerInfo(uint64_t *info_bits = nullptr,
                            uint64_t *value_bits = nullptr,
                            uint64_t *payload = nullptr) override {
    return false;
  }

uint64_t GetInstanceSize() override;

ObjCLanguageRuntime::ObjCISA GetISA() override { return m_objc_class_ptr; }

bool Describe(
      std::function<void(ObjCLanguageRuntime::ObjCISA)> const &superclass_func,
      std::function<bool(const char *, const char *)> const
          &instance_method_func,
      std::function<bool(const char *, const char *)> const &class_method_func,
      std::function<bool(const char *, const char *, lldb::addr_t,
                         uint64_t)> const &ivar_func) const override;

size_t GetNumIVars() override {
    GetIVarInformation();
    return m_ivars_storage.size();
  }

iVarDescriptor GetIVarAtIndex(size_t idx) override {
    if (idx >= GetNumIVars())
      return iVarDescriptor();
    return m_ivars_storage[idx];
  }

protected:
  void GetIVarInformation();

private:
  static const uint32_t RW_REALIZED = (1 << 31);

struct objc_class_t {
    ObjCLanguageRuntime::ObjCISA m_isa; // The class's metaclass.
    ObjCLanguageRuntime::ObjCISA m_superclass;
    lldb::addr_t m_cache_ptr;
    lldb::addr_t m_vtable_ptr;
    lldb::addr_t m_data_ptr;
    uint8_t m_flags;

objc_class_t()
        : m_isa(0), m_superclass(0), m_cache_ptr(0), m_vtable_ptr(0),
          m_data_ptr(0), m_flags(0) {}

void Clear() {
      m_isa = 0;
      m_superclass = 0;
      m_cache_ptr = 0;
      m_vtable_ptr = 0;
      m_data_ptr = 0;
      m_flags = 0;
    }

bool Read(Process *process, lldb::addr_t addr);
  };

struct class_ro_t {
    uint32_t m_flags;
    uint32_t m_instanceStart;
    uint32_t m_instanceSize;
    uint32_t m_reserved;

lldb::addr_t m_ivarLayout_ptr;
    lldb::addr_t m_name_ptr;
    lldb::addr_t m_baseMethods_ptr;
    lldb::addr_t m_baseProtocols_ptr;
    lldb::addr_t m_ivars_ptr;

lldb::addr_t m_weakIvarLayout_ptr;
    lldb::addr_t m_baseProperties_ptr;

std::string m_name;

bool Read(Process *process, lldb::addr_t addr);
  };

struct class_rw_t {
    uint32_t m_flags;
    uint32_t m_version;

lldb::addr_t m_ro_ptr;
    union {
      lldb::addr_t m_method_list_ptr;
      lldb::addr_t m_method_lists_ptr;
    };
    lldb::addr_t m_properties_ptr;
    lldb::addr_t m_protocols_ptr;

ObjCLanguageRuntime::ObjCISA m_firstSubclass;
    ObjCLanguageRuntime::ObjCISA m_nextSiblingClass;

bool Read(Process *process, lldb::addr_t addr);
  };

struct method_list_t {
    uint16_t m_entsize;
    bool m_is_small;
    bool m_has_direct_selector;
    uint32_t m_count;
    lldb::addr_t m_first_ptr;

bool Read(Process *process, lldb::addr_t addr);
  };

struct method_t {
    lldb::addr_t m_name_ptr;
    lldb::addr_t m_types_ptr;
    lldb::addr_t m_imp_ptr;

std::string m_name;
    std::string m_types;

static size_t GetSize(Process *process, bool is_small) {
      size_t field_size;
      if (is_small)
        field_size = 4; // uint32_t relative indirect fields
      else
        field_size = process->GetAddressByteSize();

return field_size    // SEL name;
             + field_size  // const char *types;
             + field_size; // IMP imp;
    }

bool Read(Process *process, lldb::addr_t addr, bool, bool);
  };

struct ivar_list_t {
    uint32_t m_entsize;
    uint32_t m_count;
    lldb::addr_t m_first_ptr;

bool Read(Process *process, lldb::addr_t addr);
  };

struct ivar_t {
    lldb::addr_t m_offset_ptr;
    lldb::addr_t m_name_ptr;
    lldb::addr_t m_type_ptr;
    uint32_t m_alignment;
    uint32_t m_size;

std::string m_name;
    std::string m_type;

static size_t GetSize(Process *process) {
      size_t ptr_size = process->GetAddressByteSize();

return ptr_size            // uintptr_t *offset;
             + ptr_size          // const char *name;
             + ptr_size          // const char *type;
             + sizeof(uint32_t)  // uint32_t alignment;
             + sizeof(uint32_t); // uint32_t size;
    }

bool Read(Process *process, lldb::addr_t addr);
  };

class iVarsStorage {
  public:
    iVarsStorage();

size_t size();

iVarDescriptor &operator[](size_t idx);

void fill(AppleObjCRuntimeV2 &runtime, ClassDescriptorV2 &descriptor);

private:
    bool m_filled;
    std::vector<iVarDescriptor> m_ivars;
    std::recursive_mutex m_mutex;
  };

// The constructor should only be invoked by the runtime as it builds its
  // caches
  // or populates them.  A ClassDescriptorV2 should only ever exist in a cache.
  ClassDescriptorV2(AppleObjCRuntimeV2 &runtime,
                    ObjCLanguageRuntime::ObjCISA isa, const char *name)
      : m_runtime(runtime), m_objc_class_ptr(isa), m_name(name),
        m_ivars_storage() {}

bool Read_objc_class(Process *process,
                       std::unique_ptr<objc_class_t> &objc_class) const;

bool Read_class_row(Process *process, const objc_class_t &objc_class,
                      std::unique_ptr<class_ro_t> &class_ro,
                      std::unique_ptr<class_rw_t> &class_rw) const;

AppleObjCRuntimeV2
      &m_runtime; // The runtime, so we can read information lazily.
  lldb::addr_t m_objc_class_ptr; // The address of the objc_class_t.  (I.e.,
                                 // objects of this class type have this as
                                 // their ISA)
  ConstString m_name;            // May be NULL
  iVarsStorage m_ivars_storage;
};

// tagged pointer descriptor
class ClassDescriptorV2Tagged : public ObjCLanguageRuntime::ClassDescriptor {
public:
  ClassDescriptorV2Tagged(ConstString class_name, uint64_t payload) {
    m_name = class_name;
    if (!m_name) {
      m_valid = false;
      return;
    }
    m_valid = true;
    m_payload = payload;
    m_info_bits = (m_payload & 0xF0ULL) >> 4;
    m_value_bits = (m_payload & ~0x0000000000000000FFULL) >> 8;
  }

ClassDescriptorV2Tagged(
      ObjCLanguageRuntime::ClassDescriptorSP actual_class_sp,
      uint64_t payload) {
    if (!actual_class_sp) {
      m_valid = false;
      return;
    }
    m_name = actual_class_sp->GetClassName();
    if (!m_name) {
      m_valid = false;
      return;
    }
    m_valid = true;
    m_payload = payload;
    m_info_bits = (m_payload & 0x0FULL);
    m_value_bits = (m_payload & ~0x0FULL) >> 4;
  }

~ClassDescriptorV2Tagged() override = default;

ConstString GetClassName() override { return m_name; }

ObjCLanguageRuntime::ClassDescriptorSP GetSuperclass() override {
    // tagged pointers can represent a class that has a superclass, but since
    // that information is not
    // stored in the object itself, we would have to query the runtime to
    // discover the hierarchy
    // for the time being, we skip this step in the interest of static discovery
    return ObjCLanguageRuntime::ClassDescriptorSP();
  }

ObjCLanguageRuntime::ClassDescriptorSP GetMetaclass() const override {
    return ObjCLanguageRuntime::ClassDescriptorSP();
  }

bool IsValid() override { return m_valid; }

bool IsKVO() override {
    return false; // tagged pointers are not KVO'ed
  }

bool IsCFType() override {
    return false; // tagged pointers are not CF objects
  }

bool GetTaggedPointerInfo(uint64_t *info_bits = nullptr,
                            uint64_t *value_bits = nullptr,
                            uint64_t *payload = nullptr) override {
    if (info_bits)
      *info_bits = GetInfoBits();
    if (value_bits)
      *value_bits = GetValueBits();
    if (payload)
      *payload = GetPayload();
    return true;
  }

uint64_t GetInstanceSize() override {
    return (IsValid() ? m_pointer_size : 0);
  }

ObjCLanguageRuntime::ObjCISA GetISA() override {
    return 0; // tagged pointers have no ISA
  }

// these calls are not part of any formal tagged pointers specification
  virtual uint64_t GetValueBits() { return (IsValid() ? m_value_bits : 0); }

virtual uint64_t GetInfoBits() { return (IsValid() ? m_info_bits : 0); }

virtual uint64_t GetPayload() { return (IsValid() ? m_payload : 0); }

private:
  ConstString m_name;
  uint8_t m_pointer_size;
  bool m_valid;
  uint64_t m_info_bits;
  uint64_t m_value_bits;
  uint64_t m_payload;
};

} // namespace lldb_private

#endif // LLDB_SOURCE_PLUGINS_LANGUAGERUNTIME_OBJC_APPLEOBJCRUNTIME_APPLEOBJCCLASSDESCRIPTORV2_H

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Editing: AppleObjCClassDescriptorV2.h

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