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//===-- ABI.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_ABI_h_
#define liblldb_ABI_h_
#include "lldb/Core/PluginInterface.h"
#include "lldb/Symbol/UnwindPlan.h"
#include "lldb/Utility/Status.h"
#include "lldb/lldb-private.h"
#include "llvm/ADT/ArrayRef.h"
// forward define the llvm::Type class
namespace llvm {
class Type;
}
namespace lldb_private {
class ABI : public PluginInterface {
public:
struct CallArgument {
enum eType {
HostPointer = 0, /* pointer to host data */
TargetValue, /* value is on the target or literal */
};
eType type; /* value of eType */
size_t size; /* size in bytes of this argument */
lldb::addr_t value; /* literal value */
std::unique_ptr<uint8_t[]> data_ap; /* host data pointer */
};
~ABI() override;
virtual size_t GetRedZoneSize() const = 0;
virtual bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
lldb::addr_t functionAddress,
lldb::addr_t returnAddress,
llvm::ArrayRef<lldb::addr_t> args) const = 0;
// Prepare trivial call used from ThreadPlanFunctionCallUsingABI
// AD:
// . Because i don't want to change other ABI's this is not declared pure
// virtual.
// The dummy implementation will simply fail. Only HexagonABI will
// currently
// use this method.
// . Two PrepareTrivialCall's is not good design so perhaps this should be
// combined.
//
virtual bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
lldb::addr_t functionAddress,
lldb::addr_t returnAddress,
llvm::Type &prototype,
llvm::ArrayRef<CallArgument> args) const;
virtual bool GetArgumentValues(Thread &thread, ValueList &values) const = 0;
lldb::ValueObjectSP GetReturnValueObject(Thread &thread, CompilerType &type,
bool persistent = true) const;
// specialized to work with llvm IR types
lldb::ValueObjectSP GetReturnValueObject(Thread &thread, llvm::Type &type,
bool persistent = true) const;
// Set the Return value object in the current frame as though a function with
virtual Status SetReturnValueObject(lldb::StackFrameSP &frame_sp,
lldb::ValueObjectSP &new_value) = 0;
protected:
// This is the method the ABI will call to actually calculate the return
// value. Don't put it in a persistent value object, that will be done by the
// ABI::GetReturnValueObject.
virtual lldb::ValueObjectSP
GetReturnValueObjectImpl(Thread &thread, CompilerType &ast_type) const = 0;
// specialized to work with llvm IR types
virtual lldb::ValueObjectSP
GetReturnValueObjectImpl(Thread &thread, llvm::Type &ir_type) const;
//------------------------------------------------------------------
/// Request to get a Process shared pointer.
///
/// This ABI object may not have been created with a Process object,
/// or the Process object may no longer be alive. Be sure to handle
/// the case where the shared pointer returned does not have an
/// object inside it.
//------------------------------------------------------------------
lldb::ProcessSP GetProcessSP() const { return m_process_wp.lock(); }
public:
virtual bool CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) = 0;
virtual bool CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) = 0;
virtual bool RegisterIsVolatile(const RegisterInfo *reg_info) = 0;
virtual bool
GetFallbackRegisterLocation(const RegisterInfo *reg_info,
UnwindPlan::Row::RegisterLocation &unwind_regloc);
// Should take a look at a call frame address (CFA) which is just the stack
// pointer value upon entry to a function. ABIs usually impose alignment
// restrictions (4, 8 or 16 byte aligned), and zero is usually not allowed.
// This function should return true if "cfa" is valid call frame address for
// the ABI, and false otherwise. This is used by the generic stack frame
// unwinding code to help determine when a stack ends.
virtual bool CallFrameAddressIsValid(lldb::addr_t cfa) = 0;
// Validates a possible PC value and returns true if an opcode can be at
// "pc".
virtual bool CodeAddressIsValid(lldb::addr_t pc) = 0;
virtual lldb::addr_t FixCodeAddress(lldb::addr_t pc) {
// Some targets might use bits in a code address to indicate a mode switch.
// ARM uses bit zero to signify a code address is thumb, so any ARM ABI
// plug-ins would strip those bits.
return pc;
}
virtual const RegisterInfo *GetRegisterInfoArray(uint32_t &count) = 0;
bool GetRegisterInfoByName(const ConstString &name, RegisterInfo &info);
bool GetRegisterInfoByKind(lldb::RegisterKind reg_kind, uint32_t reg_num,
RegisterInfo &info);
virtual bool GetPointerReturnRegister(const char *&name) { return false; }
static lldb::ABISP FindPlugin(lldb::ProcessSP process_sp, const ArchSpec &arch);
protected:
//------------------------------------------------------------------
// Classes that inherit from ABI can see and modify these
//------------------------------------------------------------------
ABI(lldb::ProcessSP process_sp) {
if (process_sp.get())
m_process_wp = process_sp;
}
lldb::ProcessWP m_process_wp;
private:
DISALLOW_COPY_AND_ASSIGN(ABI);
};
} // namespace lldb_private
#endif // liblldb_ABI_h_
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