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//===-- ABIMacOSX_i386.h ----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_ABIMacOSX_i386_h_
#define liblldb_ABIMacOSX_i386_h_
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/lldb-private.h"
#include "lldb/Target/ABI.h"
#include "lldb/Core/Value.h"
class ABIMacOSX_i386 :
public lldb_private::ABI
{
public:
~ABIMacOSX_i386() 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 return_addr,
llvm::ArrayRef<lldb::addr_t> args) const override;
bool
GetArgumentValues(lldb_private::Thread &thread,
lldb_private::ValueList &values) const override;
lldb_private::Error
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;
// The Darwin i386 ABI requires that stack frames be 16 byte aligned.
// When there is a trap handler on the stack, e.g. _sigtramp in userland
// code, we've seen that the stack pointer is often not aligned properly
// before the handler is invoked. This means that lldb will stop the unwind
// early -- before the function which caused the trap.
//
// To work around this, we relax that alignment to be just word-size (4-bytes).
// Whitelisting the trap handlers for user space would be easy (_sigtramp) but
// in other environments there can be a large number of different functions
// involved in async traps.
//
// If we were to enforce 16-byte alignment, we also need to relax to 4-byte
// alignment for non-darwin i386 targets.
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.
return pc <= UINT32_MAX;
}
const lldb_private::RegisterInfo *
GetRegisterInfoArray(uint32_t &count) override;
//------------------------------------------------------------------
// Static Functions
//------------------------------------------------------------------
static void
Initialize();
static void
Terminate();
static lldb::ABISP
CreateInstance (const lldb_private::ArchSpec &arch);
//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------
static lldb_private::ConstString
GetPluginNameStatic ();
lldb_private::ConstString
GetPluginName() override;
uint32_t
GetPluginVersion() override;
protected:
lldb::ValueObjectSP
GetReturnValueObjectImpl(lldb_private::Thread &thread,
lldb_private::CompilerType &ast_type) const override;
bool
RegisterIsCalleeSaved (const lldb_private::RegisterInfo *reg_info);
private:
ABIMacOSX_i386() :
lldb_private::ABI()
{
// Call CreateInstance instead.
}
};
#endif // liblldb_ABIMacOSX_i386_h_
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