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| //===-- NSException.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 "clang/AST/DeclCXX.h"
#include "Cocoa.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Target/ProcessStructReader.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/Stream.h"
#include "Plugins/Language/ObjC/NSString.h"
#include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
static bool ExtractFields(ValueObject &valobj, ValueObjectSP *name_sp,
ValueObjectSP *reason_sp, ValueObjectSP *userinfo_sp,
ValueObjectSP *reserved_sp) {
ProcessSP process_sp(valobj.GetProcessSP());
if (!process_sp)
return false;
lldb::addr_t ptr = LLDB_INVALID_ADDRESS;
CompilerType valobj_type(valobj.GetCompilerType());
Flags type_flags(valobj_type.GetTypeInfo());
if (type_flags.AllClear(eTypeHasValue)) {
if (valobj.IsBaseClass() && valobj.GetParent())
ptr = valobj.GetParent()->GetValueAsUnsigned(LLDB_INVALID_ADDRESS);
} else {
ptr = valobj.GetValueAsUnsigned(LLDB_INVALID_ADDRESS);
}
if (ptr == LLDB_INVALID_ADDRESS)
return false;
size_t ptr_size = process_sp->GetAddressByteSize();
Status error;
auto name = process_sp->ReadPointerFromMemory(ptr + 1 * ptr_size, error);
if (error.Fail() || name == LLDB_INVALID_ADDRESS)
return false;
auto reason = process_sp->ReadPointerFromMemory(ptr + 2 * ptr_size, error);
if (error.Fail() || reason == LLDB_INVALID_ADDRESS)
return false;
auto userinfo = process_sp->ReadPointerFromMemory(ptr + 3 * ptr_size, error);
if (error.Fail() || userinfo == LLDB_INVALID_ADDRESS)
return false;
auto reserved = process_sp->ReadPointerFromMemory(ptr + 4 * ptr_size, error);
if (error.Fail() || reserved == LLDB_INVALID_ADDRESS)
return false;
InferiorSizedWord name_isw(name, *process_sp);
InferiorSizedWord reason_isw(reason, *process_sp);
InferiorSizedWord userinfo_isw(userinfo, *process_sp);
InferiorSizedWord reserved_isw(reserved, *process_sp);
CompilerType voidstar = process_sp->GetTarget()
.GetScratchClangASTContext()
->GetBasicType(lldb::eBasicTypeVoid)
.GetPointerType();
if (name_sp)
*name_sp = ValueObject::CreateValueObjectFromData(
"name", name_isw.GetAsData(process_sp->GetByteOrder()),
valobj.GetExecutionContextRef(), voidstar);
if (reason_sp)
*reason_sp = ValueObject::CreateValueObjectFromData(
"reason", reason_isw.GetAsData(process_sp->GetByteOrder()),
valobj.GetExecutionContextRef(), voidstar);
if (userinfo_sp)
*userinfo_sp = ValueObject::CreateValueObjectFromData(
"userInfo", userinfo_isw.GetAsData(process_sp->GetByteOrder()),
valobj.GetExecutionContextRef(), voidstar);
if (reserved_sp)
*reserved_sp = ValueObject::CreateValueObjectFromData(
"reserved", reserved_isw.GetAsData(process_sp->GetByteOrder()),
valobj.GetExecutionContextRef(), voidstar);
return true;
}
bool lldb_private::formatters::NSException_SummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
lldb::ValueObjectSP name_sp;
lldb::ValueObjectSP reason_sp;
if (!ExtractFields(valobj, &name_sp, &reason_sp, nullptr, nullptr))
return false;
if (!name_sp || !reason_sp)
return false;
StreamString name_str_summary;
StreamString reason_str_summary;
if (NSStringSummaryProvider(*name_sp, name_str_summary, options) &&
NSStringSummaryProvider(*reason_sp, reason_str_summary, options) &&
!name_str_summary.Empty() && !reason_str_summary.Empty()) {
stream.Printf("name: %s - reason: %s", name_str_summary.GetData(),
reason_str_summary.GetData());
return true;
} else
return false;
}
class NSExceptionSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
NSExceptionSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp) {}
~NSExceptionSyntheticFrontEnd() override = default;
size_t CalculateNumChildren() override {
return 4;
}
lldb::ValueObjectSP GetChildAtIndex(size_t idx) override {
switch (idx) {
case 0: return m_name_sp;
case 1: return m_reason_sp;
case 2: return m_userinfo_sp;
case 3: return m_reserved_sp;
}
return lldb::ValueObjectSP();
}
bool Update() override {
m_name_sp.reset();
m_reason_sp.reset();
m_userinfo_sp.reset();
m_reserved_sp.reset();
return ExtractFields(m_backend, &m_name_sp, &m_reason_sp, &m_userinfo_sp,
&m_reserved_sp);
}
bool MightHaveChildren() override { return true; }
size_t GetIndexOfChildWithName(ConstString name) override {
// NSException has 4 members:
// NSString *name;
// NSString *reason;
// NSDictionary *userInfo;
// id reserved;
static ConstString g___name("name");
static ConstString g___reason("reason");
static ConstString g___userInfo("userInfo");
static ConstString g___reserved("reserved");
if (name == g___name) return 0;
if (name == g___reason) return 1;
if (name == g___userInfo) return 2;
if (name == g___reserved) return 3;
return UINT32_MAX;
}
private:
ValueObjectSP m_name_sp;
ValueObjectSP m_reason_sp;
ValueObjectSP m_userinfo_sp;
ValueObjectSP m_reserved_sp;
};
SyntheticChildrenFrontEnd *
lldb_private::formatters::NSExceptionSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
lldb::ProcessSP process_sp(valobj_sp->GetProcessSP());
if (!process_sp)
return nullptr;
ObjCLanguageRuntime *runtime = ObjCLanguageRuntime::Get(*process_sp);
if (!runtime)
return nullptr;
ObjCLanguageRuntime::ClassDescriptorSP descriptor(
runtime->GetClassDescriptor(*valobj_sp.get()));
if (!descriptor.get() || !descriptor->IsValid())
return nullptr;
const char *class_name = descriptor->GetClassName().GetCString();
if (!class_name || !*class_name)
return nullptr;
if (!strcmp(class_name, "NSException"))
return (new NSExceptionSyntheticFrontEnd(valobj_sp));
else if (!strcmp(class_name, "NSCFException"))
return (new NSExceptionSyntheticFrontEnd(valobj_sp));
else if (!strcmp(class_name, "__NSCFException"))
return (new NSExceptionSyntheticFrontEnd(valobj_sp));
return nullptr;
}
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