2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
229 lines
8.1 KiB
C++
229 lines
8.1 KiB
C++
//===-- ValueObjectChild.cpp ------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Core/ValueObjectChild.h"
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#include "lldb/Core/Value.h"
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#include "lldb/Symbol/CompilerType.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Utility/Flags.h"
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#include "lldb/Utility/Scalar.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/lldb-forward.h"
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#include <functional>
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#include <memory>
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#include <vector>
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#include <stdio.h>
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#include <string.h>
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using namespace lldb_private;
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ValueObjectChild::ValueObjectChild(
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ValueObject &parent, const CompilerType &compiler_type,
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const ConstString &name, uint64_t byte_size, int32_t byte_offset,
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uint32_t bitfield_bit_size, uint32_t bitfield_bit_offset,
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bool is_base_class, bool is_deref_of_parent,
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AddressType child_ptr_or_ref_addr_type, uint64_t language_flags)
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: ValueObject(parent), m_compiler_type(compiler_type),
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m_byte_size(byte_size), m_byte_offset(byte_offset),
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m_bitfield_bit_size(bitfield_bit_size),
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m_bitfield_bit_offset(bitfield_bit_offset),
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m_is_base_class(is_base_class), m_is_deref_of_parent(is_deref_of_parent),
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m_can_update_with_invalid_exe_ctx() {
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m_name = name;
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SetAddressTypeOfChildren(child_ptr_or_ref_addr_type);
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SetLanguageFlags(language_flags);
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}
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ValueObjectChild::~ValueObjectChild() {}
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lldb::ValueType ValueObjectChild::GetValueType() const {
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return m_parent->GetValueType();
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}
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size_t ValueObjectChild::CalculateNumChildren(uint32_t max) {
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ExecutionContext exe_ctx(GetExecutionContextRef());
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auto children_count = GetCompilerType().GetNumChildren(true, &exe_ctx);
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return children_count <= max ? children_count : max;
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}
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static void AdjustForBitfieldness(ConstString &name,
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uint8_t bitfield_bit_size) {
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if (name && bitfield_bit_size) {
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const char *compiler_type_name = name.AsCString();
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if (compiler_type_name) {
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std::vector<char> bitfield_type_name(strlen(compiler_type_name) + 32, 0);
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::snprintf(&bitfield_type_name.front(), bitfield_type_name.size(),
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"%s:%u", compiler_type_name, bitfield_bit_size);
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name.SetCString(&bitfield_type_name.front());
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}
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}
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}
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ConstString ValueObjectChild::GetTypeName() {
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if (m_type_name.IsEmpty()) {
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m_type_name = GetCompilerType().GetConstTypeName();
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AdjustForBitfieldness(m_type_name, m_bitfield_bit_size);
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}
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return m_type_name;
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}
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ConstString ValueObjectChild::GetQualifiedTypeName() {
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ConstString qualified_name = GetCompilerType().GetConstTypeName();
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AdjustForBitfieldness(qualified_name, m_bitfield_bit_size);
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return qualified_name;
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}
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ConstString ValueObjectChild::GetDisplayTypeName() {
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ConstString display_name = GetCompilerType().GetDisplayTypeName();
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AdjustForBitfieldness(display_name, m_bitfield_bit_size);
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return display_name;
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}
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LazyBool ValueObjectChild::CanUpdateWithInvalidExecutionContext() {
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if (m_can_update_with_invalid_exe_ctx.hasValue())
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return m_can_update_with_invalid_exe_ctx.getValue();
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if (m_parent) {
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ValueObject *opinionated_parent =
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m_parent->FollowParentChain([](ValueObject *valobj) -> bool {
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return (valobj->CanUpdateWithInvalidExecutionContext() ==
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eLazyBoolCalculate);
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});
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if (opinionated_parent)
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return (m_can_update_with_invalid_exe_ctx =
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opinionated_parent->CanUpdateWithInvalidExecutionContext())
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.getValue();
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}
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return (m_can_update_with_invalid_exe_ctx =
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this->ValueObject::CanUpdateWithInvalidExecutionContext())
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.getValue();
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}
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bool ValueObjectChild::UpdateValue() {
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m_error.Clear();
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SetValueIsValid(false);
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ValueObject *parent = m_parent;
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if (parent) {
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if (parent->UpdateValueIfNeeded(false)) {
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m_value.SetCompilerType(GetCompilerType());
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CompilerType parent_type(parent->GetCompilerType());
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// Copy the parent scalar value and the scalar value type
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m_value.GetScalar() = parent->GetValue().GetScalar();
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Value::ValueType value_type = parent->GetValue().GetValueType();
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m_value.SetValueType(value_type);
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Flags parent_type_flags(parent_type.GetTypeInfo());
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const bool is_instance_ptr_base =
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((m_is_base_class) &&
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(parent_type_flags.AnySet(lldb::eTypeInstanceIsPointer)));
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if (parent->GetCompilerType().ShouldTreatScalarValueAsAddress()) {
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lldb::addr_t addr = parent->GetPointerValue();
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m_value.GetScalar() = addr;
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if (addr == LLDB_INVALID_ADDRESS) {
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m_error.SetErrorString("parent address is invalid.");
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} else if (addr == 0) {
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m_error.SetErrorString("parent is NULL");
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} else {
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m_value.GetScalar() += m_byte_offset;
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AddressType addr_type = parent->GetAddressTypeOfChildren();
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switch (addr_type) {
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case eAddressTypeFile: {
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lldb::ProcessSP process_sp(GetProcessSP());
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if (process_sp && process_sp->IsAlive())
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m_value.SetValueType(Value::eValueTypeLoadAddress);
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else
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m_value.SetValueType(Value::eValueTypeFileAddress);
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} break;
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case eAddressTypeLoad:
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m_value.SetValueType(is_instance_ptr_base
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? Value::eValueTypeScalar
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: Value::eValueTypeLoadAddress);
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break;
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case eAddressTypeHost:
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m_value.SetValueType(Value::eValueTypeHostAddress);
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break;
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case eAddressTypeInvalid:
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// TODO: does this make sense?
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m_value.SetValueType(Value::eValueTypeScalar);
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break;
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}
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}
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} else {
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switch (value_type) {
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case Value::eValueTypeLoadAddress:
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case Value::eValueTypeFileAddress:
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case Value::eValueTypeHostAddress: {
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lldb::addr_t addr =
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m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
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if (addr == LLDB_INVALID_ADDRESS) {
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m_error.SetErrorString("parent address is invalid.");
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} else if (addr == 0) {
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m_error.SetErrorString("parent is NULL");
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} else {
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// Set this object's scalar value to the address of its value by
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// adding its byte offset to the parent address
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m_value.GetScalar() += GetByteOffset();
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}
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} break;
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case Value::eValueTypeScalar:
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// try to extract the child value from the parent's scalar value
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{
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Scalar scalar(m_value.GetScalar());
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if (m_bitfield_bit_size)
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scalar.ExtractBitfield(m_bitfield_bit_size,
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m_bitfield_bit_offset);
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else
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scalar.ExtractBitfield(8 * m_byte_size, 8 * m_byte_offset);
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m_value.GetScalar() = scalar;
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}
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break;
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default:
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m_error.SetErrorString("parent has invalid value.");
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break;
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}
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}
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if (m_error.Success()) {
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const bool thread_and_frame_only_if_stopped = true;
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ExecutionContext exe_ctx(
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GetExecutionContextRef().Lock(thread_and_frame_only_if_stopped));
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if (GetCompilerType().GetTypeInfo() & lldb::eTypeHasValue) {
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Value &value = is_instance_ptr_base ? m_parent->GetValue() : m_value;
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m_error =
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value.GetValueAsData(&exe_ctx, m_data, 0, GetModule().get());
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} else {
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m_error.Clear(); // No value so nothing to read...
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}
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}
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} else {
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m_error.SetErrorStringWithFormat("parent failed to evaluate: %s",
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parent->GetError().AsCString());
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}
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} else {
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m_error.SetErrorString("ValueObjectChild has a NULL parent ValueObject.");
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}
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return m_error.Success();
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}
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bool ValueObjectChild::IsInScope() {
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ValueObject *root(GetRoot());
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if (root)
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return root->IsInScope();
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return false;
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}
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