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//===-- ABI.cpp -------------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Target/ABI.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "Plugins/ExpressionParser/Clang/ClangPersistentVariables.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Symbol/TypeSystem.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
using namespace lldb;
using namespace lldb_private;
ABISP
ABI::FindPlugin (const ArchSpec &arch)
{
ABISP abi_sp;
ABICreateInstance create_callback;
for (uint32_t idx = 0;
(create_callback = PluginManager::GetABICreateCallbackAtIndex(idx)) != nullptr;
++idx)
{
abi_sp = create_callback(arch);
if (abi_sp)
return abi_sp;
}
abi_sp.reset();
return abi_sp;
}
ABI::ABI() = default;
ABI::~ABI() = default;
bool
ABI::GetRegisterInfoByName (const ConstString &name, RegisterInfo &info)
{
uint32_t count = 0;
const RegisterInfo *register_info_array = GetRegisterInfoArray (count);
if (register_info_array)
{
const char *unique_name_cstr = name.GetCString();
uint32_t i;
for (i = 0; i < count; ++i)
{
if (register_info_array[i].name == unique_name_cstr)
{
info = register_info_array[i];
return true;
}
}
for (i = 0; i < count; ++i)
{
if (register_info_array[i].alt_name == unique_name_cstr)
{
info = register_info_array[i];
return true;
}
}
}
return false;
}
bool
ABI::GetRegisterInfoByKind (RegisterKind reg_kind, uint32_t reg_num, RegisterInfo &info)
{
if (reg_kind < eRegisterKindEHFrame || reg_kind >= kNumRegisterKinds)
return false;
uint32_t count = 0;
const RegisterInfo *register_info_array = GetRegisterInfoArray (count);
if (register_info_array)
{
for (uint32_t i = 0; i < count; ++i)
{
if (register_info_array[i].kinds[reg_kind] == reg_num)
{
info = register_info_array[i];
return true;
}
}
}
return false;
}
ValueObjectSP
ABI::GetReturnValueObject (Thread &thread,
CompilerType &ast_type,
bool persistent) const
{
if (!ast_type.IsValid())
return ValueObjectSP();
ValueObjectSP return_valobj_sp;
return_valobj_sp = GetReturnValueObjectImpl(thread, ast_type);
if (!return_valobj_sp)
return return_valobj_sp;
// Now turn this into a persistent variable.
// FIXME: This code is duplicated from Target::EvaluateExpression, and it is used in similar form in a couple
// of other places. Figure out the correct Create function to do all this work.
if (persistent)
{
PersistentExpressionState *persistent_expression_state = thread.CalculateTarget()->GetPersistentExpressionStateForLanguage(ast_type.GetMinimumLanguage());
if (!persistent_expression_state)
return ValueObjectSP();
ConstString persistent_variable_name (persistent_expression_state->GetNextPersistentVariableName());
lldb::ValueObjectSP const_valobj_sp;
// Check in case our value is already a constant value
if (return_valobj_sp->GetIsConstant())
{
const_valobj_sp = return_valobj_sp;
const_valobj_sp->SetName (persistent_variable_name);
}
else
const_valobj_sp = return_valobj_sp->CreateConstantValue (persistent_variable_name);
lldb::ValueObjectSP live_valobj_sp = return_valobj_sp;
return_valobj_sp = const_valobj_sp;
ExpressionVariableSP clang_expr_variable_sp(persistent_expression_state->CreatePersistentVariable(return_valobj_sp));
assert (clang_expr_variable_sp);
// Set flags and live data as appropriate
const Value &result_value = live_valobj_sp->GetValue();
switch (result_value.GetValueType())
{
case Value::eValueTypeHostAddress:
case Value::eValueTypeFileAddress:
// we don't do anything with these for now
break;
case Value::eValueTypeScalar:
case Value::eValueTypeVector:
clang_expr_variable_sp->m_flags |= ClangExpressionVariable::EVIsFreezeDried;
clang_expr_variable_sp->m_flags |= ClangExpressionVariable::EVIsLLDBAllocated;
clang_expr_variable_sp->m_flags |= ClangExpressionVariable::EVNeedsAllocation;
break;
case Value::eValueTypeLoadAddress:
clang_expr_variable_sp->m_live_sp = live_valobj_sp;
clang_expr_variable_sp->m_flags |= ClangExpressionVariable::EVIsProgramReference;
break;
}
return_valobj_sp = clang_expr_variable_sp->GetValueObject();
}
return return_valobj_sp;
}
ValueObjectSP
ABI::GetReturnValueObject(Thread &thread, llvm::Type &ast_type, bool persistent) const
{
ValueObjectSP return_valobj_sp;
return_valobj_sp = GetReturnValueObjectImpl( thread, ast_type );
return return_valobj_sp;
}
// specialized to work with llvm IR types
//
// for now we will specify a default implementation so that we don't need to
// modify other ABIs
lldb::ValueObjectSP
ABI::GetReturnValueObjectImpl( Thread &thread, llvm::Type &ir_type ) const
{
ValueObjectSP return_valobj_sp;
/* this is a dummy and will only be called if an ABI does not override this */
return return_valobj_sp;
}
bool
ABI::PrepareTrivialCall (Thread &thread,
lldb::addr_t sp,
lldb::addr_t functionAddress,
lldb::addr_t returnAddress,
llvm::Type &returntype,
llvm::ArrayRef<ABI::CallArgument> args) const
{
// dummy prepare trivial call
assert( !"Should never get here!" );
return false;
}
bool
ABI::GetFallbackRegisterLocation (const RegisterInfo *reg_info,
UnwindPlan::Row::RegisterLocation &unwind_regloc)
{
// Did the UnwindPlan fail to give us the caller's stack pointer?
// The stack pointer is defined to be the same as THIS frame's CFA, so return the CFA value as
// the caller's stack pointer. This is true on x86-32/x86-64 at least.
if (reg_info->kinds[eRegisterKindGeneric] == LLDB_REGNUM_GENERIC_SP)
{
unwind_regloc.SetIsCFAPlusOffset(0);
return true;
}
// If a volatile register is being requested, we don't want to forward the next frame's register contents
// up the stack -- the register is not retrievable at this frame.
if (RegisterIsVolatile(reg_info))
{
unwind_regloc.SetUndefined();
return true;
}
return false;
}
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