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| //===-- TypeFormat.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/DataFormatters/TypeFormat.h"
#include "lldb/lldb-enumerations.h"
#include "lldb/lldb-public.h"
#include "lldb/Core/DumpDataExtractor.h"
#include "lldb/DataFormatters/FormatManager.h"
#include "lldb/Symbol/CompilerType.h"
#include "lldb/Symbol/SymbolContext.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Symbol/TypeList.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/StreamString.h"
using namespace lldb;
using namespace lldb_private;
TypeFormatImpl::TypeFormatImpl(const Flags &flags)
: m_flags(flags), m_my_revision(0) {}
TypeFormatImpl::~TypeFormatImpl() {}
TypeFormatImpl_Format::TypeFormatImpl_Format(lldb::Format f,
const TypeFormatImpl::Flags &flags)
: TypeFormatImpl(flags), m_format(f) {}
TypeFormatImpl_Format::~TypeFormatImpl_Format() {}
bool TypeFormatImpl_Format::FormatObject(ValueObject *valobj,
std::string &dest) const {
if (!valobj)
return false;
if (valobj->CanProvideValue()) {
Value &value(valobj->GetValue());
const Value::ContextType context_type = value.GetContextType();
ExecutionContext exe_ctx(valobj->GetExecutionContextRef());
DataExtractor data;
if (context_type == Value::eContextTypeRegisterInfo) {
const RegisterInfo *reg_info = value.GetRegisterInfo();
if (reg_info) {
Status error;
valobj->GetData(data, error);
if (error.Fail())
return false;
StreamString reg_sstr;
DumpDataExtractor(data, ®_sstr, 0, GetFormat(), reg_info->byte_size,
1, UINT32_MAX, LLDB_INVALID_ADDRESS, 0, 0,
exe_ctx.GetBestExecutionContextScope());
dest = reg_sstr.GetString();
}
} else {
CompilerType compiler_type = value.GetCompilerType();
if (compiler_type) {
// put custom bytes to display in the DataExtractor to override the
// default value logic
if (GetFormat() == eFormatCString) {
lldb_private::Flags type_flags(compiler_type.GetTypeInfo(
nullptr)); // disambiguate w.r.t. TypeFormatImpl::Flags
if (type_flags.Test(eTypeIsPointer) &&
!type_flags.Test(eTypeIsObjC)) {
// if we are dumping a pointer as a c-string, get the pointee data
// as a string
TargetSP target_sp(valobj->GetTargetSP());
if (target_sp) {
size_t max_len = target_sp->GetMaximumSizeOfStringSummary();
Status error;
DataBufferSP buffer_sp(new DataBufferHeap(max_len + 1, 0));
Address address(valobj->GetPointerValue());
if (target_sp->ReadCStringFromMemory(
address, (char *)buffer_sp->GetBytes(), max_len, error) &&
error.Success())
data.SetData(buffer_sp);
}
}
} else {
Status error;
valobj->GetData(data, error);
if (error.Fail())
return false;
}
ExecutionContextScope *exe_scope =
exe_ctx.GetBestExecutionContextScope();
llvm::Optional<uint64_t> size = compiler_type.GetByteSize(exe_scope);
if (!size)
return false;
StreamString sstr;
compiler_type.DumpTypeValue(
&sstr, // The stream to use for display
GetFormat(), // Format to display this type with
data, // Data to extract from
0, // Byte offset into "m_data"
*size, // Byte size of item in "m_data"
valobj->GetBitfieldBitSize(), // Bitfield bit size
valobj->GetBitfieldBitOffset(), // Bitfield bit offset
exe_scope);
// Given that we do not want to set the ValueObject's m_error for a
// formatting error (or else we wouldn't be able to reformat until a
// next update), an empty string is treated as a "false" return from
// here, but that's about as severe as we get
// CompilerType::DumpTypeValue() should always return something, even
// if that something is an error message
dest = sstr.GetString();
}
}
return !dest.empty();
} else
return false;
}
std::string TypeFormatImpl_Format::GetDescription() {
StreamString sstr;
sstr.Printf("%s%s%s%s", FormatManager::GetFormatAsCString(GetFormat()),
Cascades() ? "" : " (not cascading)",
SkipsPointers() ? " (skip pointers)" : "",
SkipsReferences() ? " (skip references)" : "");
return sstr.GetString();
}
TypeFormatImpl_EnumType::TypeFormatImpl_EnumType(
ConstString type_name, const TypeFormatImpl::Flags &flags)
: TypeFormatImpl(flags), m_enum_type(type_name), m_types() {}
TypeFormatImpl_EnumType::~TypeFormatImpl_EnumType() {}
bool TypeFormatImpl_EnumType::FormatObject(ValueObject *valobj,
std::string &dest) const {
dest.clear();
if (!valobj)
return false;
if (!valobj->CanProvideValue())
return false;
ProcessSP process_sp;
TargetSP target_sp;
void *valobj_key = (process_sp = valobj->GetProcessSP()).get();
if (!valobj_key)
valobj_key = (target_sp = valobj->GetTargetSP()).get();
else
target_sp = process_sp->GetTarget().shared_from_this();
if (!valobj_key)
return false;
auto iter = m_types.find(valobj_key), end = m_types.end();
CompilerType valobj_enum_type;
if (iter == end) {
// probably a redundant check
if (!target_sp)
return false;
const ModuleList &images(target_sp->GetImages());
TypeList types;
llvm::DenseSet<lldb_private::SymbolFile *> searched_symbol_files;
images.FindTypes(nullptr, m_enum_type, false, UINT32_MAX,
searched_symbol_files, types);
if (types.Empty())
return false;
for (lldb::TypeSP type_sp : types.Types()) {
if (!type_sp)
continue;
if ((type_sp->GetForwardCompilerType().GetTypeInfo() &
eTypeIsEnumeration) == eTypeIsEnumeration) {
valobj_enum_type = type_sp->GetFullCompilerType();
m_types.emplace(valobj_key, valobj_enum_type);
break;
}
}
} else
valobj_enum_type = iter->second;
if (!valobj_enum_type.IsValid())
return false;
DataExtractor data;
Status error;
valobj->GetData(data, error);
if (error.Fail())
return false;
ExecutionContext exe_ctx(valobj->GetExecutionContextRef());
StreamString sstr;
valobj_enum_type.DumpTypeValue(&sstr, lldb::eFormatEnum, data, 0,
data.GetByteSize(), 0, 0,
exe_ctx.GetBestExecutionContextScope());
if (!sstr.GetString().empty())
dest = sstr.GetString();
return !dest.empty();
}
std::string TypeFormatImpl_EnumType::GetDescription() {
StreamString sstr;
sstr.Printf("as type %s%s%s%s", m_enum_type.AsCString("<invalid type>"),
Cascades() ? "" : " (not cascading)",
SkipsPointers() ? " (skip pointers)" : "",
SkipsReferences() ? " (skip references)" : "");
return sstr.GetString();
}
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