ABISysV_arm.h

//===-- ABISysV_arm.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 liblldb_ABISysV_arm_h_
#define liblldb_ABISysV_arm_h_

#include "lldb/Target/ABI.h"
#include "lldb/lldb-private.h"

class ABISysV_arm : public lldb_private::ABI {
public:
  ~ABISysV_arm() override = default;

  size_t GetRedZoneSize() const override;

  bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
                          lldb::addr_t func_addr, lldb::addr_t returnAddress,
                          llvm::ArrayRef<lldb::addr_t> args) const override;

  bool GetArgumentValues(lldb_private::Thread &thread,
                         lldb_private::ValueList &values) const override;

  lldb_private::Status
  SetReturnValueObject(lldb::StackFrameSP &frame_sp,
                       lldb::ValueObjectSP &new_value) override;

  bool
  CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;

  bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;

  bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;

  bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
    // Make sure the stack call frame addresses are are 4 byte aligned
    if (cfa & (4ull - 1ull))
      return false; // Not 4 byte aligned
    if (cfa == 0)
      return false; // Zero is not a valid stack address
    return true;
  }

  bool CodeAddressIsValid(lldb::addr_t pc) override {
    // Just make sure the address is a valid 32 bit address. Bit zero
    // might be set due to Thumb function calls, so don't enforce 2 byte
    // alignment
    return pc <= UINT32_MAX;
  }

  lldb::addr_t FixCodeAddress(lldb::addr_t pc) override {
    // ARM uses bit zero to signify a code address is thumb, so we must
    // strip bit zero in any code addresses.
    return pc & ~(lldb::addr_t)1;
  }

  const lldb_private::RegisterInfo *
  GetRegisterInfoArray(uint32_t &count) override;

  bool IsArmHardFloat(lldb_private::Thread &thread) const;

  // Static Functions

  static void Initialize();

  static void Terminate();

  static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);

  static lldb_private::ConstString GetPluginNameStatic();

  // PluginInterface protocol

  lldb_private::ConstString GetPluginName() override;

  uint32_t GetPluginVersion() override;

protected:
  lldb::ValueObjectSP
  GetReturnValueObjectImpl(lldb_private::Thread &thread,
                           lldb_private::CompilerType &ast_type) const override;

private:
  ABISysV_arm(lldb::ProcessSP process_sp,
              std::unique_ptr<llvm::MCRegisterInfo> info_up)
      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
    // Call CreateInstance instead.
  }
};

#endif // liblldb_ABISysV_arm_h_