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//===-- ValueObjectMemory.cpp ---------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/ValueObjectMemory.h"
#include "lldb/Core/Value.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Symbol/Type.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Scalar.h"
#include "lldb/Utility/Status.h"
#include "lldb/lldb-types.h"
#include "llvm/Support/ErrorHandling.h"
#include <assert.h>
#include <memory>
namespace lldb_private {
class ExecutionContextScope;
}
using namespace lldb;
using namespace lldb_private;
ValueObjectSP ValueObjectMemory::Create(ExecutionContextScope *exe_scope,
llvm::StringRef name,
const Address &address,
lldb::TypeSP &type_sp) {
return (new ValueObjectMemory(exe_scope, name, address, type_sp))->GetSP();
}
ValueObjectSP ValueObjectMemory::Create(ExecutionContextScope *exe_scope,
llvm::StringRef name,
const Address &address,
const CompilerType &ast_type) {
return (new ValueObjectMemory(exe_scope, name, address, ast_type))->GetSP();
}
ValueObjectMemory::ValueObjectMemory(ExecutionContextScope *exe_scope,
llvm::StringRef name,
const Address &address,
lldb::TypeSP &type_sp)
: ValueObject(exe_scope), m_address(address), m_type_sp(type_sp),
m_compiler_type() {
// Do not attempt to construct one of these objects with no variable!
assert(m_type_sp.get() != NULL);
SetName(ConstString(name));
m_value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
TargetSP target_sp(GetTargetSP());
lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
if (load_address != LLDB_INVALID_ADDRESS) {
m_value.SetValueType(Value::eValueTypeLoadAddress);
m_value.GetScalar() = load_address;
} else {
lldb::addr_t file_address = m_address.GetFileAddress();
if (file_address != LLDB_INVALID_ADDRESS) {
m_value.SetValueType(Value::eValueTypeFileAddress);
m_value.GetScalar() = file_address;
} else {
m_value.GetScalar() = m_address.GetOffset();
m_value.SetValueType(Value::eValueTypeScalar);
}
}
}
ValueObjectMemory::ValueObjectMemory(ExecutionContextScope *exe_scope,
llvm::StringRef name,
const Address &address,
const CompilerType &ast_type)
: ValueObject(exe_scope), m_address(address), m_type_sp(),
m_compiler_type(ast_type) {
// Do not attempt to construct one of these objects with no variable!
assert(m_compiler_type.GetTypeSystem());
assert(m_compiler_type.GetOpaqueQualType());
TargetSP target_sp(GetTargetSP());
SetName(ConstString(name));
// m_value.SetContext(Value::eContextTypeClangType,
// m_compiler_type.GetOpaqueQualType());
m_value.SetCompilerType(m_compiler_type);
lldb::addr_t load_address = m_address.GetLoadAddress(target_sp.get());
if (load_address != LLDB_INVALID_ADDRESS) {
m_value.SetValueType(Value::eValueTypeLoadAddress);
m_value.GetScalar() = load_address;
} else {
lldb::addr_t file_address = m_address.GetFileAddress();
if (file_address != LLDB_INVALID_ADDRESS) {
m_value.SetValueType(Value::eValueTypeFileAddress);
m_value.GetScalar() = file_address;
} else {
m_value.GetScalar() = m_address.GetOffset();
m_value.SetValueType(Value::eValueTypeScalar);
}
}
}
ValueObjectMemory::~ValueObjectMemory() {}
CompilerType ValueObjectMemory::GetCompilerTypeImpl() {
if (m_type_sp)
return m_type_sp->GetForwardCompilerType();
return m_compiler_type;
}
ConstString ValueObjectMemory::GetTypeName() {
if (m_type_sp)
return m_type_sp->GetName();
return m_compiler_type.GetConstTypeName();
}
ConstString ValueObjectMemory::GetDisplayTypeName() {
if (m_type_sp)
return m_type_sp->GetForwardCompilerType().GetDisplayTypeName();
return m_compiler_type.GetDisplayTypeName();
}
size_t ValueObjectMemory::CalculateNumChildren(uint32_t max) {
if (m_type_sp) {
auto child_count = m_type_sp->GetNumChildren(true);
return child_count <= max ? child_count : max;
}
ExecutionContext exe_ctx(GetExecutionContextRef());
const bool omit_empty_base_classes = true;
auto child_count =
m_compiler_type.GetNumChildren(omit_empty_base_classes, &exe_ctx);
return child_count <= max ? child_count : max;
}
uint64_t ValueObjectMemory::GetByteSize() {
if (m_type_sp)
return m_type_sp->GetByteSize();
if (llvm::Optional<uint64_t> size = m_compiler_type.GetByteSize(nullptr))
return *size;
return 0;
}
lldb::ValueType ValueObjectMemory::GetValueType() const {
// RETHINK: Should this be inherited from somewhere?
return lldb::eValueTypeVariableGlobal;
}
bool ValueObjectMemory::UpdateValue() {
SetValueIsValid(false);
m_error.Clear();
ExecutionContext exe_ctx(GetExecutionContextRef());
Target *target = exe_ctx.GetTargetPtr();
if (target) {
m_data.SetByteOrder(target->GetArchitecture().GetByteOrder());
m_data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
}
Value old_value(m_value);
if (m_address.IsValid()) {
Value::ValueType value_type = m_value.GetValueType();
switch (value_type) {
default:
llvm_unreachable("Unhandled expression result value kind...");
case Value::eValueTypeScalar:
// The variable value is in the Scalar value inside the m_value. We can
// point our m_data right to it.
m_error = m_value.GetValueAsData(&exe_ctx, m_data, 0, GetModule().get());
break;
case Value::eValueTypeFileAddress:
case Value::eValueTypeLoadAddress:
case Value::eValueTypeHostAddress:
// The DWARF expression result was an address in the inferior process. If
// this variable is an aggregate type, we just need the address as the
// main value as all child variable objects will rely upon this location
// and add an offset and then read their own values as needed. If this
// variable is a simple type, we read all data for it into m_data. Make
// sure this type has a value before we try and read it
// If we have a file address, convert it to a load address if we can.
if (value_type == Value::eValueTypeFileAddress &&
exe_ctx.GetProcessPtr()) {
lldb::addr_t load_addr = m_address.GetLoadAddress(target);
if (load_addr != LLDB_INVALID_ADDRESS) {
m_value.SetValueType(Value::eValueTypeLoadAddress);
m_value.GetScalar() = load_addr;
}
}
if (!CanProvideValue()) {
// this value object represents an aggregate type whose children have
// values, but this object does not. So we say we are changed if our
// location has changed.
SetValueDidChange(value_type != old_value.GetValueType() ||
m_value.GetScalar() != old_value.GetScalar());
} else {
// Copy the Value and set the context to use our Variable so it can
// extract read its value into m_data appropriately
Value value(m_value);
if (m_type_sp)
value.SetContext(Value::eContextTypeLLDBType, m_type_sp.get());
else {
// value.SetContext(Value::eContextTypeClangType,
// m_compiler_type.GetOpaqueQualType());
value.SetCompilerType(m_compiler_type);
}
m_error = value.GetValueAsData(&exe_ctx, m_data, 0, GetModule().get());
}
break;
}
SetValueIsValid(m_error.Success());
}
return m_error.Success();
}
bool ValueObjectMemory::IsInScope() {
// FIXME: Maybe try to read the memory address, and if that works, then
// we are in scope?
return true;
}
lldb::ModuleSP ValueObjectMemory::GetModule() { return m_address.GetModule(); }
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