404 lines
14 KiB
C++
404 lines
14 KiB
C++
//===-- ValueObjectVariable.cpp ---------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "lldb/Core/ValueObjectVariable.h"
|
|
|
|
#include "lldb/Core/Address.h" // for Address
|
|
#include "lldb/Core/AddressRange.h" // for AddressRange
|
|
#include "lldb/Core/ArchSpec.h" // for ArchSpec
|
|
#include "lldb/Core/Module.h"
|
|
#include "lldb/Core/RegisterValue.h"
|
|
#include "lldb/Core/Scalar.h" // for Scalar, operator!=
|
|
#include "lldb/Core/Value.h"
|
|
#include "lldb/Expression/DWARFExpression.h" // for DWARFExpression
|
|
#include "lldb/Symbol/Declaration.h" // for Declaration
|
|
#include "lldb/Symbol/Function.h"
|
|
#include "lldb/Symbol/ObjectFile.h"
|
|
#include "lldb/Symbol/SymbolContext.h"
|
|
#include "lldb/Symbol/SymbolContextScope.h"
|
|
#include "lldb/Symbol/Type.h"
|
|
#include "lldb/Symbol/Variable.h"
|
|
#include "lldb/Target/ExecutionContext.h"
|
|
#include "lldb/Target/Process.h"
|
|
#include "lldb/Target/RegisterContext.h"
|
|
#include "lldb/Target/Target.h"
|
|
#include "lldb/Utility/DataExtractor.h" // for DataExtractor
|
|
#include "lldb/Utility/Status.h" // for Status
|
|
#include "lldb/lldb-private-enumerations.h" // for AddressType::eAddressTy...
|
|
#include "lldb/lldb-types.h" // for addr_t
|
|
|
|
#include "llvm/ADT/StringRef.h" // for StringRef
|
|
|
|
#include <assert.h> // for assert
|
|
#include <memory> // for shared_ptr
|
|
|
|
namespace lldb_private {
|
|
class ExecutionContextScope;
|
|
}
|
|
namespace lldb_private {
|
|
class StackFrame;
|
|
}
|
|
namespace lldb_private {
|
|
struct RegisterInfo;
|
|
}
|
|
using namespace lldb_private;
|
|
|
|
lldb::ValueObjectSP
|
|
ValueObjectVariable::Create(ExecutionContextScope *exe_scope,
|
|
const lldb::VariableSP &var_sp) {
|
|
return (new ValueObjectVariable(exe_scope, var_sp))->GetSP();
|
|
}
|
|
|
|
ValueObjectVariable::ValueObjectVariable(ExecutionContextScope *exe_scope,
|
|
const lldb::VariableSP &var_sp)
|
|
: ValueObject(exe_scope), m_variable_sp(var_sp) {
|
|
// Do not attempt to construct one of these objects with no variable!
|
|
assert(m_variable_sp.get() != NULL);
|
|
m_name = var_sp->GetName();
|
|
}
|
|
|
|
ValueObjectVariable::~ValueObjectVariable() {}
|
|
|
|
CompilerType ValueObjectVariable::GetCompilerTypeImpl() {
|
|
Type *var_type = m_variable_sp->GetType();
|
|
if (var_type)
|
|
return var_type->GetForwardCompilerType();
|
|
return CompilerType();
|
|
}
|
|
|
|
ConstString ValueObjectVariable::GetTypeName() {
|
|
Type *var_type = m_variable_sp->GetType();
|
|
if (var_type)
|
|
return var_type->GetName();
|
|
return ConstString();
|
|
}
|
|
|
|
ConstString ValueObjectVariable::GetDisplayTypeName() {
|
|
Type *var_type = m_variable_sp->GetType();
|
|
if (var_type)
|
|
return var_type->GetForwardCompilerType().GetDisplayTypeName();
|
|
return ConstString();
|
|
}
|
|
|
|
ConstString ValueObjectVariable::GetQualifiedTypeName() {
|
|
Type *var_type = m_variable_sp->GetType();
|
|
if (var_type)
|
|
return var_type->GetQualifiedName();
|
|
return ConstString();
|
|
}
|
|
|
|
size_t ValueObjectVariable::CalculateNumChildren(uint32_t max) {
|
|
CompilerType type(GetCompilerType());
|
|
|
|
if (!type.IsValid())
|
|
return 0;
|
|
|
|
const bool omit_empty_base_classes = true;
|
|
auto child_count = type.GetNumChildren(omit_empty_base_classes);
|
|
return child_count <= max ? child_count : max;
|
|
}
|
|
|
|
uint64_t ValueObjectVariable::GetByteSize() {
|
|
ExecutionContext exe_ctx(GetExecutionContextRef());
|
|
|
|
CompilerType type(GetCompilerType());
|
|
|
|
if (!type.IsValid())
|
|
return 0;
|
|
|
|
return type.GetByteSize(exe_ctx.GetBestExecutionContextScope());
|
|
}
|
|
|
|
lldb::ValueType ValueObjectVariable::GetValueType() const {
|
|
if (m_variable_sp)
|
|
return m_variable_sp->GetScope();
|
|
return lldb::eValueTypeInvalid;
|
|
}
|
|
|
|
bool ValueObjectVariable::UpdateValue() {
|
|
SetValueIsValid(false);
|
|
m_error.Clear();
|
|
|
|
Variable *variable = m_variable_sp.get();
|
|
DWARFExpression &expr = variable->LocationExpression();
|
|
|
|
if (variable->GetLocationIsConstantValueData()) {
|
|
// expr doesn't contain DWARF bytes, it contains the constant variable
|
|
// value bytes themselves...
|
|
if (expr.GetExpressionData(m_data))
|
|
m_value.SetContext(Value::eContextTypeVariable, variable);
|
|
else
|
|
m_error.SetErrorString("empty constant data");
|
|
// constant bytes can't be edited - sorry
|
|
m_resolved_value.SetContext(Value::eContextTypeInvalid, NULL);
|
|
} else {
|
|
lldb::addr_t loclist_base_load_addr = LLDB_INVALID_ADDRESS;
|
|
ExecutionContext exe_ctx(GetExecutionContextRef());
|
|
|
|
Target *target = exe_ctx.GetTargetPtr();
|
|
if (target) {
|
|
m_data.SetByteOrder(target->GetArchitecture().GetByteOrder());
|
|
m_data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
|
|
}
|
|
|
|
if (expr.IsLocationList()) {
|
|
SymbolContext sc;
|
|
variable->CalculateSymbolContext(&sc);
|
|
if (sc.function)
|
|
loclist_base_load_addr =
|
|
sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress(
|
|
target);
|
|
}
|
|
Value old_value(m_value);
|
|
if (expr.Evaluate(&exe_ctx, nullptr, nullptr, nullptr,
|
|
loclist_base_load_addr, nullptr, nullptr, m_value,
|
|
&m_error)) {
|
|
m_resolved_value = m_value;
|
|
m_value.SetContext(Value::eContextTypeVariable, variable);
|
|
|
|
CompilerType compiler_type = GetCompilerType();
|
|
if (compiler_type.IsValid())
|
|
m_value.SetCompilerType(compiler_type);
|
|
|
|
Value::ValueType value_type = m_value.GetValueType();
|
|
|
|
Process *process = exe_ctx.GetProcessPtr();
|
|
const bool process_is_alive = process && process->IsAlive();
|
|
const uint32_t type_info = compiler_type.GetTypeInfo();
|
|
const bool is_pointer_or_ref =
|
|
(type_info & (lldb::eTypeIsPointer | lldb::eTypeIsReference)) != 0;
|
|
|
|
switch (value_type) {
|
|
case Value::eValueTypeFileAddress:
|
|
// If this type is a pointer, then its children will be considered load
|
|
// addresses
|
|
// if the pointer or reference is dereferenced, but only if the process
|
|
// is alive.
|
|
//
|
|
// There could be global variables like in the following code:
|
|
// struct LinkedListNode { Foo* foo; LinkedListNode* next; };
|
|
// Foo g_foo1;
|
|
// Foo g_foo2;
|
|
// LinkedListNode g_second_node = { &g_foo2, NULL };
|
|
// LinkedListNode g_first_node = { &g_foo1, &g_second_node };
|
|
//
|
|
// When we aren't running, we should be able to look at these variables
|
|
// using
|
|
// the "target variable" command. Children of the "g_first_node" always
|
|
// will
|
|
// be of the same address type as the parent. But children of the "next"
|
|
// member of
|
|
// LinkedListNode will become load addresses if we have a live process,
|
|
// or remain
|
|
// what a file address if it what a file address.
|
|
if (process_is_alive && is_pointer_or_ref)
|
|
SetAddressTypeOfChildren(eAddressTypeLoad);
|
|
else
|
|
SetAddressTypeOfChildren(eAddressTypeFile);
|
|
break;
|
|
case Value::eValueTypeHostAddress:
|
|
// Same as above for load addresses, except children of pointer or refs
|
|
// are always
|
|
// load addresses. Host addresses are used to store freeze dried
|
|
// variables. If this
|
|
// type is a struct, the entire struct contents will be copied into the
|
|
// heap of the
|
|
// LLDB process, but we do not currrently follow any pointers.
|
|
if (is_pointer_or_ref)
|
|
SetAddressTypeOfChildren(eAddressTypeLoad);
|
|
else
|
|
SetAddressTypeOfChildren(eAddressTypeHost);
|
|
break;
|
|
case Value::eValueTypeLoadAddress:
|
|
case Value::eValueTypeScalar:
|
|
case Value::eValueTypeVector:
|
|
SetAddressTypeOfChildren(eAddressTypeLoad);
|
|
break;
|
|
}
|
|
|
|
switch (value_type) {
|
|
case Value::eValueTypeVector:
|
|
// fall through
|
|
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 && process_is_alive) {
|
|
lldb::addr_t file_addr =
|
|
m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
|
|
if (file_addr != LLDB_INVALID_ADDRESS) {
|
|
SymbolContext var_sc;
|
|
variable->CalculateSymbolContext(&var_sc);
|
|
if (var_sc.module_sp) {
|
|
ObjectFile *objfile = var_sc.module_sp->GetObjectFile();
|
|
if (objfile) {
|
|
Address so_addr(file_addr, objfile->GetSectionList());
|
|
lldb::addr_t load_addr = so_addr.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);
|
|
value.SetContext(Value::eContextTypeVariable, variable);
|
|
m_error =
|
|
value.GetValueAsData(&exe_ctx, m_data, 0, GetModule().get());
|
|
|
|
SetValueDidChange(value_type != old_value.GetValueType() ||
|
|
m_value.GetScalar() != old_value.GetScalar());
|
|
}
|
|
break;
|
|
}
|
|
|
|
SetValueIsValid(m_error.Success());
|
|
} else {
|
|
// could not find location, won't allow editing
|
|
m_resolved_value.SetContext(Value::eContextTypeInvalid, NULL);
|
|
}
|
|
}
|
|
return m_error.Success();
|
|
}
|
|
|
|
bool ValueObjectVariable::IsInScope() {
|
|
const ExecutionContextRef &exe_ctx_ref = GetExecutionContextRef();
|
|
if (exe_ctx_ref.HasFrameRef()) {
|
|
ExecutionContext exe_ctx(exe_ctx_ref);
|
|
StackFrame *frame = exe_ctx.GetFramePtr();
|
|
if (frame) {
|
|
return m_variable_sp->IsInScope(frame);
|
|
} else {
|
|
// This ValueObject had a frame at one time, but now we
|
|
// can't locate it, so return false since we probably aren't
|
|
// in scope.
|
|
return false;
|
|
}
|
|
}
|
|
// We have a variable that wasn't tied to a frame, which
|
|
// means it is a global and is always in scope.
|
|
return true;
|
|
}
|
|
|
|
lldb::ModuleSP ValueObjectVariable::GetModule() {
|
|
if (m_variable_sp) {
|
|
SymbolContextScope *sc_scope = m_variable_sp->GetSymbolContextScope();
|
|
if (sc_scope) {
|
|
return sc_scope->CalculateSymbolContextModule();
|
|
}
|
|
}
|
|
return lldb::ModuleSP();
|
|
}
|
|
|
|
SymbolContextScope *ValueObjectVariable::GetSymbolContextScope() {
|
|
if (m_variable_sp)
|
|
return m_variable_sp->GetSymbolContextScope();
|
|
return NULL;
|
|
}
|
|
|
|
bool ValueObjectVariable::GetDeclaration(Declaration &decl) {
|
|
if (m_variable_sp) {
|
|
decl = m_variable_sp->GetDeclaration();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
const char *ValueObjectVariable::GetLocationAsCString() {
|
|
if (m_resolved_value.GetContextType() == Value::eContextTypeRegisterInfo)
|
|
return GetLocationAsCStringImpl(m_resolved_value, m_data);
|
|
else
|
|
return ValueObject::GetLocationAsCString();
|
|
}
|
|
|
|
bool ValueObjectVariable::SetValueFromCString(const char *value_str,
|
|
Status &error) {
|
|
if (!UpdateValueIfNeeded()) {
|
|
error.SetErrorString("unable to update value before writing");
|
|
return false;
|
|
}
|
|
|
|
if (m_resolved_value.GetContextType() == Value::eContextTypeRegisterInfo) {
|
|
RegisterInfo *reg_info = m_resolved_value.GetRegisterInfo();
|
|
ExecutionContext exe_ctx(GetExecutionContextRef());
|
|
RegisterContext *reg_ctx = exe_ctx.GetRegisterContext();
|
|
RegisterValue reg_value;
|
|
if (!reg_info || !reg_ctx) {
|
|
error.SetErrorString("unable to retrieve register info");
|
|
return false;
|
|
}
|
|
error = reg_value.SetValueFromString(reg_info, llvm::StringRef(value_str));
|
|
if (error.Fail())
|
|
return false;
|
|
if (reg_ctx->WriteRegister(reg_info, reg_value)) {
|
|
SetNeedsUpdate();
|
|
return true;
|
|
} else {
|
|
error.SetErrorString("unable to write back to register");
|
|
return false;
|
|
}
|
|
} else
|
|
return ValueObject::SetValueFromCString(value_str, error);
|
|
}
|
|
|
|
bool ValueObjectVariable::SetData(DataExtractor &data, Status &error) {
|
|
if (!UpdateValueIfNeeded()) {
|
|
error.SetErrorString("unable to update value before writing");
|
|
return false;
|
|
}
|
|
|
|
if (m_resolved_value.GetContextType() == Value::eContextTypeRegisterInfo) {
|
|
RegisterInfo *reg_info = m_resolved_value.GetRegisterInfo();
|
|
ExecutionContext exe_ctx(GetExecutionContextRef());
|
|
RegisterContext *reg_ctx = exe_ctx.GetRegisterContext();
|
|
RegisterValue reg_value;
|
|
if (!reg_info || !reg_ctx) {
|
|
error.SetErrorString("unable to retrieve register info");
|
|
return false;
|
|
}
|
|
error = reg_value.SetValueFromData(reg_info, data, 0, true);
|
|
if (error.Fail())
|
|
return false;
|
|
if (reg_ctx->WriteRegister(reg_info, reg_value)) {
|
|
SetNeedsUpdate();
|
|
return true;
|
|
} else {
|
|
error.SetErrorString("unable to write back to register");
|
|
return false;
|
|
}
|
|
} else
|
|
return ValueObject::SetData(data, error);
|
|
}
|