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//===-- ValueObjectChild.cpp ----------------------------------------------===//
//
// 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/ValueObjectChild.h"
#include "lldb/Core/Value.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/Process.h"
#include "lldb/Utility/Flags.h"
#include "lldb/Utility/Scalar.h"
#include "lldb/Utility/Status.h"
#include "lldb/lldb-forward.h"
#include <functional>
#include <memory>
#include <vector>
#include <cstdio>
#include <cstring>
using namespace lldb_private;
ValueObjectChild::ValueObjectChild(
ValueObject &parent, const CompilerType &compiler_type,
ConstString name, uint64_t byte_size, int32_t byte_offset,
uint32_t bitfield_bit_size, uint32_t bitfield_bit_offset,
bool is_base_class, bool is_deref_of_parent,
AddressType child_ptr_or_ref_addr_type, uint64_t language_flags)
: ValueObject(parent), m_compiler_type(compiler_type),
m_byte_size(byte_size), m_byte_offset(byte_offset),
m_bitfield_bit_size(bitfield_bit_size),
m_bitfield_bit_offset(bitfield_bit_offset),
m_is_base_class(is_base_class), m_is_deref_of_parent(is_deref_of_parent),
m_can_update_with_invalid_exe_ctx() {
m_name = name;
SetAddressTypeOfChildren(child_ptr_or_ref_addr_type);
SetLanguageFlags(language_flags);
}
ValueObjectChild::~ValueObjectChild() = default;
lldb::ValueType ValueObjectChild::GetValueType() const {
return m_parent->GetValueType();
}
size_t ValueObjectChild::CalculateNumChildren(uint32_t max) {
ExecutionContext exe_ctx(GetExecutionContextRef());
auto children_count = GetCompilerType().GetNumChildren(true, &exe_ctx);
return children_count <= max ? children_count : max;
}
static void AdjustForBitfieldness(ConstString &name,
uint8_t bitfield_bit_size) {
if (name && bitfield_bit_size)
name.SetString(llvm::formatv("{0}:{1}", name, bitfield_bit_size).str());
}
ConstString ValueObjectChild::GetTypeName() {
if (m_type_name.IsEmpty()) {
m_type_name = GetCompilerType().GetTypeName();
AdjustForBitfieldness(m_type_name, m_bitfield_bit_size);
}
return m_type_name;
}
ConstString ValueObjectChild::GetQualifiedTypeName() {
ConstString qualified_name = GetCompilerType().GetTypeName();
AdjustForBitfieldness(qualified_name, m_bitfield_bit_size);
return qualified_name;
}
ConstString ValueObjectChild::GetDisplayTypeName() {
ConstString display_name = GetCompilerType().GetDisplayTypeName();
AdjustForBitfieldness(display_name, m_bitfield_bit_size);
return display_name;
}
LazyBool ValueObjectChild::CanUpdateWithInvalidExecutionContext() {
if (m_can_update_with_invalid_exe_ctx)
return *m_can_update_with_invalid_exe_ctx;
if (m_parent) {
ValueObject *opinionated_parent =
m_parent->FollowParentChain([](ValueObject *valobj) -> bool {
return (valobj->CanUpdateWithInvalidExecutionContext() ==
eLazyBoolCalculate);
});
if (opinionated_parent)
return *(m_can_update_with_invalid_exe_ctx =
opinionated_parent->CanUpdateWithInvalidExecutionContext());
}
return *(m_can_update_with_invalid_exe_ctx =
this->ValueObject::CanUpdateWithInvalidExecutionContext());
}
bool ValueObjectChild::UpdateValue() {
m_error.Clear();
SetValueIsValid(false);
ValueObject *parent = m_parent;
if (parent) {
if (parent->UpdateValueIfNeeded(false)) {
m_value.SetCompilerType(GetCompilerType());
CompilerType parent_type(parent->GetCompilerType());
// Copy the parent scalar value and the scalar value type
m_value.GetScalar() = parent->GetValue().GetScalar();
m_value.SetValueType(parent->GetValue().GetValueType());
Flags parent_type_flags(parent_type.GetTypeInfo());
const bool is_instance_ptr_base =
((m_is_base_class) &&
(parent_type_flags.AnySet(lldb::eTypeInstanceIsPointer)));
if (parent->GetCompilerType().ShouldTreatScalarValueAsAddress()) {
m_value.GetScalar() = parent->GetPointerValue();
switch (parent->GetAddressTypeOfChildren()) {
case eAddressTypeFile: {
lldb::ProcessSP process_sp(GetProcessSP());
if (process_sp && process_sp->IsAlive())
m_value.SetValueType(Value::ValueType::LoadAddress);
else
m_value.SetValueType(Value::ValueType::FileAddress);
} break;
case eAddressTypeLoad:
m_value.SetValueType(is_instance_ptr_base
? Value::ValueType::Scalar
: Value::ValueType::LoadAddress);
break;
case eAddressTypeHost:
m_value.SetValueType(Value::ValueType::HostAddress);
break;
case eAddressTypeInvalid:
// TODO: does this make sense?
m_value.SetValueType(Value::ValueType::Scalar);
break;
}
}
switch (m_value.GetValueType()) {
case Value::ValueType::Invalid:
break;
case Value::ValueType::LoadAddress:
case Value::ValueType::FileAddress:
case Value::ValueType::HostAddress: {
lldb::addr_t addr = m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
if (addr == LLDB_INVALID_ADDRESS) {
m_error.SetErrorString("parent address is invalid.");
} else if (addr == 0) {
m_error.SetErrorString("parent is NULL");
} else {
// If a bitfield doesn't fit into the child_byte_size'd window at
// child_byte_offset, move the window forward until it fits. The
// problem here is that Value has no notion of bitfields and thus the
// Value's DataExtractor is sized like the bitfields CompilerType; a
// sequence of bitfields, however, can be larger than their underlying
// type.
if (m_bitfield_bit_offset) {
const bool thread_and_frame_only_if_stopped = true;
ExecutionContext exe_ctx(GetExecutionContextRef().Lock(
thread_and_frame_only_if_stopped));
if (auto type_bit_size = GetCompilerType().GetBitSize(
exe_ctx.GetBestExecutionContextScope())) {
uint64_t bitfield_end =
m_bitfield_bit_size + m_bitfield_bit_offset;
if (bitfield_end > *type_bit_size) {
uint64_t overhang_bytes =
(bitfield_end - *type_bit_size + 7) / 8;
m_byte_offset += overhang_bytes;
m_bitfield_bit_offset -= overhang_bytes * 8;
}
}
}
// Set this object's scalar value to the address of its value by
// adding its byte offset to the parent address
m_value.GetScalar() += m_byte_offset;
}
} break;
case Value::ValueType::Scalar:
// try to extract the child value from the parent's scalar value
{
Scalar scalar(m_value.GetScalar());
scalar.ExtractBitfield(8 * m_byte_size, 8 * m_byte_offset);
m_value.GetScalar() = scalar;
}
break;
}
if (m_error.Success()) {
const bool thread_and_frame_only_if_stopped = true;
ExecutionContext exe_ctx(
GetExecutionContextRef().Lock(thread_and_frame_only_if_stopped));
if (GetCompilerType().GetTypeInfo() & lldb::eTypeHasValue) {
Value &value = is_instance_ptr_base ? m_parent->GetValue() : m_value;
m_error =
value.GetValueAsData(&exe_ctx, m_data, GetModule().get());
} else {
m_error.Clear(); // No value so nothing to read...
}
}
} else {
m_error.SetErrorStringWithFormat("parent failed to evaluate: %s",
parent->GetError().AsCString());
}
} else {
m_error.SetErrorString("ValueObjectChild has a NULL parent ValueObject.");
}
return m_error.Success();
}
bool ValueObjectChild::IsInScope() {
ValueObject *root(GetRoot());
if (root)
return root->IsInScope();
return false;
}
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