Coverage Report

Created: 2022-01-25 06:29

/Users/buildslave/jenkins/workspace/coverage/llvm-project/lldb/source/Plugins/ABI/X86/ABISysV_x86_64.h
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//===-- ABISysV_x86_64.h ----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H
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#define LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H
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#include "Plugins/ABI/X86/ABIX86_64.h"
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class ABISysV_x86_64 : public ABIX86_64 {
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public:
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  ~ABISysV_x86_64() override = default;
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  size_t GetRedZoneSize() const override;
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  bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
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                          lldb::addr_t functionAddress,
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                          lldb::addr_t returnAddress,
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                          llvm::ArrayRef<lldb::addr_t> args) const override;
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  bool GetArgumentValues(lldb_private::Thread &thread,
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                         lldb_private::ValueList &values) const override;
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  lldb_private::Status
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  SetReturnValueObject(lldb::StackFrameSP &frame_sp,
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                       lldb::ValueObjectSP &new_value) override;
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  lldb::ValueObjectSP
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  GetReturnValueObjectImpl(lldb_private::Thread &thread,
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                           lldb_private::CompilerType &type) const override;
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  bool
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  CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
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  bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
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  bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
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  // The SysV x86_64 ABI requires that stack frames be 16 byte aligned.
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  // When there is a trap handler on the stack, e.g. _sigtramp in userland
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  // code, we've seen that the stack pointer is often not aligned properly
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  // before the handler is invoked.  This means that lldb will stop the unwind
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  // early -- before the function which caused the trap.
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  //
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  // To work around this, we relax that alignment to be just word-size
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  // (8-bytes).
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  // Allowing the trap handlers for user space would be easy (_sigtramp) but
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  // in other environments there can be a large number of different functions
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  // involved in async traps.
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  bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
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    // Make sure the stack call frame addresses are 8 byte aligned
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    if (cfa & (8ull - 1ull))
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      return false; // Not 8 byte aligned
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    if (cfa == 0)
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      return false; // Zero is not a valid stack address
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    return true;
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  }
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  bool CodeAddressIsValid(lldb::addr_t pc) override {
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    // We have a 64 bit address space, so anything is valid as opcodes
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    // aren't fixed width...
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    return true;
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  }
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  bool GetPointerReturnRegister(const char *&name) override;
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  // Static Functions
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  static void Initialize();
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  static void Terminate();
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  static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
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  static llvm::StringRef GetPluginNameStatic() { return "sysv-x86_64"; }
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  // PluginInterface protocol
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  llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
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protected:
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  void CreateRegisterMapIfNeeded();
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  lldb::ValueObjectSP
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  GetReturnValueObjectSimple(lldb_private::Thread &thread,
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                             lldb_private::CompilerType &ast_type) const;
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  bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
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  uint32_t GetGenericNum(llvm::StringRef reg) override;
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private:
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  using ABIX86_64::ABIX86_64; // Call CreateInstance instead.
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};
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#endif // LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H