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a67cf0001f5d24305f6c443da05266781c94de2e
clang-p2996/lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp
Zachary Turner bf9a77305f Move classes from Core -> Utility. 
This moves the following classes from Core -> Utility.

ConstString
Error
RegularExpression
Stream
StreamString

The goal here is to get lldbUtility into a state where it has
no dependendencies except on itself and LLVM, so it can be the
starting point at which to start untangling LLDB's dependencies.
These are all low level and very widely used classes, and
previously lldbUtility had dependencies up to lldbCore in order
to use these classes.  So moving then down to lldbUtility makes
sense from both the short term and long term perspective in
solving this problem.

Differential Revision: https://reviews.llvm.org/D29427

llvm-svn: 293941
2017-02-02 21:39:50 +00:00

737 lines
23 KiB
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//===-- LibCxx.cpp ----------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "LibCxx.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/FormatEntity.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Core/ValueObjectConstResult.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/DataFormatters/StringPrinter.h"
#include "lldb/DataFormatters/TypeSummary.h"
#include "lldb/DataFormatters/VectorIterator.h"
#include "lldb/Host/Endian.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Utility/Error.h"
#include "lldb/Utility/ProcessStructReader.h"
#include "lldb/Utility/Stream.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
bool lldb_private::formatters::LibcxxSmartPointerSummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
ValueObjectSP valobj_sp(valobj.GetNonSyntheticValue());
if (!valobj_sp)
return false;
ValueObjectSP ptr_sp(
valobj_sp->GetChildMemberWithName(ConstString("__ptr_"), true));
ValueObjectSP count_sp(valobj_sp->GetChildAtNamePath(
{ConstString("__cntrl_"), ConstString("__shared_owners_")}));
ValueObjectSP weakcount_sp(valobj_sp->GetChildAtNamePath(
{ConstString("__cntrl_"), ConstString("__shared_weak_owners_")}));
if (!ptr_sp)
return false;
if (ptr_sp->GetValueAsUnsigned(0) == 0) {
stream.Printf("nullptr");
return true;
} else {
bool print_pointee = false;
Error error;
ValueObjectSP pointee_sp = ptr_sp->Dereference(error);
if (pointee_sp && error.Success()) {
if (pointee_sp->DumpPrintableRepresentation(
stream, ValueObject::eValueObjectRepresentationStyleSummary,
lldb::eFormatInvalid,
ValueObject::PrintableRepresentationSpecialCases::eDisable,
false))
print_pointee = true;
}
if (!print_pointee)
stream.Printf("ptr = 0x%" PRIx64, ptr_sp->GetValueAsUnsigned(0));
}
if (count_sp)
stream.Printf(" strong=%" PRIu64, 1 + count_sp->GetValueAsUnsigned(0));
if (weakcount_sp)
stream.Printf(" weak=%" PRIu64, 1 + weakcount_sp->GetValueAsUnsigned(0));
return true;
}
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::
LibcxxVectorBoolSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_bool_type(), m_exe_ctx_ref(),
m_count(0), m_base_data_address(0), m_children() {
if (valobj_sp) {
Update();
m_bool_type =
valobj_sp->GetCompilerType().GetBasicTypeFromAST(lldb::eBasicTypeBool);
}
}
size_t lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::
CalculateNumChildren() {
return m_count;
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::GetChildAtIndex(
size_t idx) {
auto iter = m_children.find(idx), end = m_children.end();
if (iter != end)
return iter->second;
if (idx >= m_count)
return ValueObjectSP();
if (m_base_data_address == 0 || m_count == 0)
return ValueObjectSP();
if (!m_bool_type)
return ValueObjectSP();
size_t byte_idx = (idx >> 3); // divide by 8 to get byte index
size_t bit_index = (idx & 7); // efficient idx % 8 for bit index
lldb::addr_t byte_location = m_base_data_address + byte_idx;
ProcessSP process_sp(m_exe_ctx_ref.GetProcessSP());
if (!process_sp)
return ValueObjectSP();
uint8_t byte = 0;
uint8_t mask = 0;
Error err;
size_t bytes_read = process_sp->ReadMemory(byte_location, &byte, 1, err);
if (err.Fail() || bytes_read == 0)
return ValueObjectSP();
switch (bit_index) {
case 0:
mask = 1;
break;
case 1:
mask = 2;
break;
case 2:
mask = 4;
break;
case 3:
mask = 8;
break;
case 4:
mask = 16;
break;
case 5:
mask = 32;
break;
case 6:
mask = 64;
break;
case 7:
mask = 128;
break;
default:
return ValueObjectSP();
}
bool bit_set = ((byte & mask) != 0);
DataBufferSP buffer_sp(
new DataBufferHeap(m_bool_type.GetByteSize(nullptr), 0));
if (bit_set && buffer_sp && buffer_sp->GetBytes())
*(buffer_sp->GetBytes()) =
1; // regardless of endianness, anything non-zero is true
StreamString name;
name.Printf("[%" PRIu64 "]", (uint64_t)idx);
ValueObjectSP retval_sp(CreateValueObjectFromData(
name.GetString(), DataExtractor(buffer_sp, process_sp->GetByteOrder(),
process_sp->GetAddressByteSize()),
m_exe_ctx_ref, m_bool_type));
if (retval_sp)
m_children[idx] = retval_sp;
return retval_sp;
}
/*(std::__1::vector<std::__1::allocator<bool> >) vBool = {
__begin_ = 0x00000001001000e0
__size_ = 56
__cap_alloc_ = {
std::__1::__libcpp_compressed_pair_imp<unsigned long,
std::__1::allocator<unsigned long> > = {
__first_ = 1
}
}
}*/
bool lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::Update() {
m_children.clear();
ValueObjectSP valobj_sp = m_backend.GetSP();
if (!valobj_sp)
return false;
m_exe_ctx_ref = valobj_sp->GetExecutionContextRef();
ValueObjectSP size_sp(
valobj_sp->GetChildMemberWithName(ConstString("__size_"), true));
if (!size_sp)
return false;
m_count = size_sp->GetValueAsUnsigned(0);
if (!m_count)
return true;
ValueObjectSP begin_sp(
valobj_sp->GetChildMemberWithName(ConstString("__begin_"), true));
if (!begin_sp) {
m_count = 0;
return false;
}
m_base_data_address = begin_sp->GetValueAsUnsigned(0);
if (!m_base_data_address) {
m_count = 0;
return false;
}
return false;
}
bool lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::
GetIndexOfChildWithName(const ConstString &name) {
if (!m_count || !m_base_data_address)
return UINT32_MAX;
const char *item_name = name.GetCString();
uint32_t idx = ExtractIndexFromString(item_name);
if (idx < UINT32_MAX && idx >= CalculateNumChildren())
return UINT32_MAX;
return idx;
}
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::
~LibcxxVectorBoolSyntheticFrontEnd() = default;
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
return (valobj_sp ? new LibcxxVectorBoolSyntheticFrontEnd(valobj_sp)
: nullptr);
}
/*
(lldb) fr var ibeg --raw --ptr-depth 1
(std::__1::__map_iterator<std::__1::__tree_iterator<std::__1::pair<int,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > >, std::__1::__tree_node<std::__1::pair<int,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > >, void *> *, long> >) ibeg = {
__i_ = {
__ptr_ = 0x0000000100103870 {
std::__1::__tree_node_base<void *> = {
std::__1::__tree_end_node<std::__1::__tree_node_base<void *> *> = {
__left_ = 0x0000000000000000
}
__right_ = 0x0000000000000000
__parent_ = 0x00000001001038b0
__is_black_ = true
}
__value_ = {
first = 0
second = { std::string }
*/
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::
LibCxxMapIteratorSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_pair_ptr(), m_pair_sp() {
if (valobj_sp)
Update();
}
bool lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::Update() {
m_pair_sp.reset();
m_pair_ptr = nullptr;
ValueObjectSP valobj_sp = m_backend.GetSP();
if (!valobj_sp)
return false;
TargetSP target_sp(valobj_sp->GetTargetSP());
if (!target_sp)
return false;
if (!valobj_sp)
return false;
static ConstString g___i_("__i_");
// this must be a ValueObject* because it is a child of the ValueObject we are
// producing children for
// it if were a ValueObjectSP, we would end up with a loop (iterator ->
// synthetic -> child -> parent == iterator)
// and that would in turn leak memory by never allowing the ValueObjects to
// die and free their memory
m_pair_ptr = valobj_sp
->GetValueForExpressionPath(
".__i_.__ptr_->__value_", nullptr, nullptr,
ValueObject::GetValueForExpressionPathOptions()
.DontCheckDotVsArrowSyntax()
.SetSyntheticChildrenTraversal(
ValueObject::GetValueForExpressionPathOptions::
SyntheticChildrenTraversal::None),
nullptr)
.get();
if (!m_pair_ptr) {
m_pair_ptr = valobj_sp
->GetValueForExpressionPath(
".__i_.__ptr_", nullptr, nullptr,
ValueObject::GetValueForExpressionPathOptions()
.DontCheckDotVsArrowSyntax()
.SetSyntheticChildrenTraversal(
ValueObject::GetValueForExpressionPathOptions::
SyntheticChildrenTraversal::None),
nullptr)
.get();
if (m_pair_ptr) {
auto __i_(valobj_sp->GetChildMemberWithName(g___i_, true));
lldb::TemplateArgumentKind kind;
if (!__i_) {
m_pair_ptr = nullptr;
return false;
}
CompilerType pair_type(__i_->GetCompilerType().GetTemplateArgument(0, kind));
std::string name; uint64_t bit_offset_ptr; uint32_t bitfield_bit_size_ptr; bool is_bitfield_ptr;
pair_type = pair_type.GetFieldAtIndex(0, name, &bit_offset_ptr, &bitfield_bit_size_ptr, &is_bitfield_ptr);
if (!pair_type) {
m_pair_ptr = nullptr;
return false;
}
auto addr(m_pair_ptr->GetValueAsUnsigned(LLDB_INVALID_ADDRESS));
m_pair_ptr = nullptr;
if (addr && addr!=LLDB_INVALID_ADDRESS) {
ClangASTContext *ast_ctx = llvm::dyn_cast_or_null<ClangASTContext>(pair_type.GetTypeSystem());
if (!ast_ctx)
return false;
CompilerType tree_node_type = ast_ctx->CreateStructForIdentifier(ConstString(), {
{"ptr0",ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
{"ptr1",ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
{"ptr2",ast_ctx->GetBasicType(lldb::eBasicTypeVoid).GetPointerType()},
{"cw",ast_ctx->GetBasicType(lldb::eBasicTypeBool)},
{"payload",pair_type}
});
DataBufferSP buffer_sp(new DataBufferHeap(tree_node_type.GetByteSize(nullptr),0));
ProcessSP process_sp(target_sp->GetProcessSP());
Error error;
process_sp->ReadMemory(addr, buffer_sp->GetBytes(), buffer_sp->GetByteSize(), error);
if (error.Fail())
return false;
DataExtractor extractor(buffer_sp, process_sp->GetByteOrder(), process_sp->GetAddressByteSize());
auto pair_sp = CreateValueObjectFromData("pair", extractor, valobj_sp->GetExecutionContextRef(), tree_node_type);
if (pair_sp)
m_pair_sp = pair_sp->GetChildAtIndex(4,true);
}
}
}
return false;
}
size_t lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::
CalculateNumChildren() {
return 2;
}
lldb::ValueObjectSP
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::GetChildAtIndex(
size_t idx) {
if (m_pair_ptr)
return m_pair_ptr->GetChildAtIndex(idx, true);
if (m_pair_sp)
return m_pair_sp->GetChildAtIndex(idx, true);
return lldb::ValueObjectSP();
}
bool lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::
GetIndexOfChildWithName(const ConstString &name) {
if (name == ConstString("first"))
return 0;
if (name == ConstString("second"))
return 1;
return UINT32_MAX;
}
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::
~LibCxxMapIteratorSyntheticFrontEnd() {
// this will be deleted when its parent dies (since it's a child object)
// delete m_pair_ptr;
}
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
return (valobj_sp ? new LibCxxMapIteratorSyntheticFrontEnd(valobj_sp)
: nullptr);
}
/*
(lldb) fr var ibeg --raw --ptr-depth 1 -T
(std::__1::__wrap_iter<int *>) ibeg = {
(std::__1::__wrap_iter<int *>::iterator_type) __i = 0x00000001001037a0 {
(int) *__i = 1
}
}
*/
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibCxxVectorIteratorSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
static ConstString g_item_name;
if (!g_item_name)
g_item_name.SetCString("__i");
return (valobj_sp
? new VectorIteratorSyntheticFrontEnd(valobj_sp, g_item_name)
: nullptr);
}
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::
LibcxxSharedPtrSyntheticFrontEnd(lldb::ValueObjectSP valobj_sp)
: SyntheticChildrenFrontEnd(*valobj_sp), m_cntrl(nullptr), m_count_sp(),
m_weak_count_sp(), m_ptr_size(0), m_byte_order(lldb::eByteOrderInvalid) {
if (valobj_sp)
Update();
}
size_t lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::
CalculateNumChildren() {
return (m_cntrl ? 1 : 0);
}
lldb::ValueObjectSP
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::GetChildAtIndex(
size_t idx) {
if (!m_cntrl)
return lldb::ValueObjectSP();
ValueObjectSP valobj_sp = m_backend.GetSP();
if (!valobj_sp)
return lldb::ValueObjectSP();
if (idx == 0)
return valobj_sp->GetChildMemberWithName(ConstString("__ptr_"), true);
if (idx > 2)
return lldb::ValueObjectSP();
if (idx == 1) {
if (!m_count_sp) {
ValueObjectSP shared_owners_sp(m_cntrl->GetChildMemberWithName(
ConstString("__shared_owners_"), true));
if (!shared_owners_sp)
return lldb::ValueObjectSP();
uint64_t count = 1 + shared_owners_sp->GetValueAsUnsigned(0);
DataExtractor data(&count, 8, m_byte_order, m_ptr_size);
m_count_sp = CreateValueObjectFromData(
"count", data, valobj_sp->GetExecutionContextRef(),
shared_owners_sp->GetCompilerType());
}
return m_count_sp;
} else /* if (idx == 2) */
{
if (!m_weak_count_sp) {
ValueObjectSP shared_weak_owners_sp(m_cntrl->GetChildMemberWithName(
ConstString("__shared_weak_owners_"), true));
if (!shared_weak_owners_sp)
return lldb::ValueObjectSP();
uint64_t count = 1 + shared_weak_owners_sp->GetValueAsUnsigned(0);
DataExtractor data(&count, 8, m_byte_order, m_ptr_size);
m_weak_count_sp = CreateValueObjectFromData(
"count", data, valobj_sp->GetExecutionContextRef(),
shared_weak_owners_sp->GetCompilerType());
}
return m_weak_count_sp;
}
}
bool lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::Update() {
m_count_sp.reset();
m_weak_count_sp.reset();
m_cntrl = nullptr;
ValueObjectSP valobj_sp = m_backend.GetSP();
if (!valobj_sp)
return false;
TargetSP target_sp(valobj_sp->GetTargetSP());
if (!target_sp)
return false;
m_byte_order = target_sp->GetArchitecture().GetByteOrder();
m_ptr_size = target_sp->GetArchitecture().GetAddressByteSize();
lldb::ValueObjectSP cntrl_sp(
valobj_sp->GetChildMemberWithName(ConstString("__cntrl_"), true));
m_cntrl = cntrl_sp.get(); // need to store the raw pointer to avoid a circular
// dependency
return false;
}
bool lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::
MightHaveChildren() {
return true;
}
size_t lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::
GetIndexOfChildWithName(const ConstString &name) {
if (name == ConstString("__ptr_"))
return 0;
if (name == ConstString("count"))
return 1;
if (name == ConstString("weak_count"))
return 2;
return UINT32_MAX;
}
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::
~LibcxxSharedPtrSyntheticFrontEnd() = default;
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
return (valobj_sp ? new LibcxxSharedPtrSyntheticFrontEnd(valobj_sp)
: nullptr);
}
bool lldb_private::formatters::LibcxxContainerSummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
if (valobj.IsPointerType()) {
uint64_t value = valobj.GetValueAsUnsigned(0);
if (!value)
return false;
stream.Printf("0x%016" PRIx64 " ", value);
}
return FormatEntity::FormatStringRef("size=${svar%#}", stream, nullptr,
nullptr, nullptr, &valobj, false, false);
}
// the field layout in a libc++ string (cap, side, data or data, size, cap)
enum LibcxxStringLayoutMode {
eLibcxxStringLayoutModeCSD = 0,
eLibcxxStringLayoutModeDSC = 1,
eLibcxxStringLayoutModeInvalid = 0xffff
};
// this function abstracts away the layout and mode details of a libc++ string
// and returns the address of the data and the size ready for callers to consume
static bool ExtractLibcxxStringInfo(ValueObject &valobj,
ValueObjectSP &location_sp,
uint64_t &size) {
ValueObjectSP D(valobj.GetChildAtIndexPath({0, 0, 0, 0}));
if (!D)
return false;
ValueObjectSP layout_decider(D->GetChildAtIndexPath({0, 0}));
// this child should exist
if (!layout_decider)
return false;
ConstString g_data_name("__data_");
ConstString g_size_name("__size_");
bool short_mode = false; // this means the string is in short-mode and the
// data is stored inline
LibcxxStringLayoutMode layout = (layout_decider->GetName() == g_data_name)
? eLibcxxStringLayoutModeDSC
: eLibcxxStringLayoutModeCSD;
uint64_t size_mode_value = 0;
if (layout == eLibcxxStringLayoutModeDSC) {
ValueObjectSP size_mode(D->GetChildAtIndexPath({1, 1, 0}));
if (!size_mode)
return false;
if (size_mode->GetName() != g_size_name) {
// we are hitting the padding structure, move along
size_mode = D->GetChildAtIndexPath({1, 1, 1});
if (!size_mode)
return false;
}
size_mode_value = (size_mode->GetValueAsUnsigned(0));
short_mode = ((size_mode_value & 0x80) == 0);
} else {
ValueObjectSP size_mode(D->GetChildAtIndexPath({1, 0, 0}));
if (!size_mode)
return false;
size_mode_value = (size_mode->GetValueAsUnsigned(0));
short_mode = ((size_mode_value & 1) == 0);
}
if (short_mode) {
ValueObjectSP s(D->GetChildAtIndex(1, true));
if (!s)
return false;
location_sp = s->GetChildAtIndex(
(layout == eLibcxxStringLayoutModeDSC) ? 0 : 1, true);
size = (layout == eLibcxxStringLayoutModeDSC)
? size_mode_value
: ((size_mode_value >> 1) % 256);
return (location_sp.get() != nullptr);
} else {
ValueObjectSP l(D->GetChildAtIndex(0, true));
if (!l)
return false;
// we can use the layout_decider object as the data pointer
location_sp = (layout == eLibcxxStringLayoutModeDSC)
? layout_decider
: l->GetChildAtIndex(2, true);
ValueObjectSP size_vo(l->GetChildAtIndex(1, true));
if (!size_vo || !location_sp)
return false;
size = size_vo->GetValueAsUnsigned(0);
return true;
}
}
bool lldb_private::formatters::LibcxxWStringSummaryProvider(
ValueObject &valobj, Stream &stream,
const TypeSummaryOptions &summary_options) {
uint64_t size = 0;
ValueObjectSP location_sp;
if (!ExtractLibcxxStringInfo(valobj, location_sp, size))
return false;
if (size == 0) {
stream.Printf("L\"\"");
return true;
}
if (!location_sp)
return false;
DataExtractor extractor;
StringPrinter::ReadBufferAndDumpToStreamOptions options(valobj);
if (summary_options.GetCapping() == TypeSummaryCapping::eTypeSummaryCapped) {
const auto max_size = valobj.GetTargetSP()->GetMaximumSizeOfStringSummary();
if (size > max_size) {
size = max_size;
options.SetIsTruncated(true);
}
}
location_sp->GetPointeeData(extractor, 0, size);
// std::wstring::size() is measured in 'characters', not bytes
auto wchar_t_size = valobj.GetTargetSP()
->GetScratchClangASTContext()
->GetBasicType(lldb::eBasicTypeWChar)
.GetByteSize(nullptr);
options.SetData(extractor);
options.SetStream(&stream);
options.SetPrefixToken("L");
options.SetQuote('"');
options.SetSourceSize(size);
options.SetBinaryZeroIsTerminator(false);
switch (wchar_t_size) {
case 1:
StringPrinter::ReadBufferAndDumpToStream<
lldb_private::formatters::StringPrinter::StringElementType::UTF8>(
options);
break;
case 2:
lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStream<
lldb_private::formatters::StringPrinter::StringElementType::UTF16>(
options);
break;
case 4:
lldb_private::formatters::StringPrinter::ReadBufferAndDumpToStream<
lldb_private::formatters::StringPrinter::StringElementType::UTF32>(
options);
break;
default:
stream.Printf("size for wchar_t is not valid");
return true;
}
return true;
}
bool lldb_private::formatters::LibcxxStringSummaryProvider(
ValueObject &valobj, Stream &stream,
const TypeSummaryOptions &summary_options) {
uint64_t size = 0;
ValueObjectSP location_sp;
if (!ExtractLibcxxStringInfo(valobj, location_sp, size))
return false;
if (size == 0) {
stream.Printf("\"\"");
return true;
}
if (!location_sp)
return false;
StringPrinter::ReadBufferAndDumpToStreamOptions options(valobj);
DataExtractor extractor;
if (summary_options.GetCapping() == TypeSummaryCapping::eTypeSummaryCapped) {
const auto max_size = valobj.GetTargetSP()->GetMaximumSizeOfStringSummary();
if (size > max_size) {
size = max_size;
options.SetIsTruncated(true);
}
}
location_sp->GetPointeeData(extractor, 0, size);
options.SetData(extractor);
options.SetStream(&stream);
options.SetPrefixToken(nullptr);
options.SetQuote('"');
options.SetSourceSize(size);
options.SetBinaryZeroIsTerminator(false);
StringPrinter::ReadBufferAndDumpToStream<
StringPrinter::StringElementType::ASCII>(options);
return true;
}
class LibcxxFunctionFrontEnd : public SyntheticValueProviderFrontEnd {
public:
LibcxxFunctionFrontEnd(ValueObject &backend)
: SyntheticValueProviderFrontEnd(backend) {}
lldb::ValueObjectSP GetSyntheticValue() override {
static ConstString g___f_("__f_");
return m_backend.GetChildMemberWithName(g___f_, true);
}
};
SyntheticChildrenFrontEnd *
lldb_private::formatters::LibcxxFunctionFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (valobj_sp)
return new LibcxxFunctionFrontEnd(*valobj_sp);
return nullptr;
}
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