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llvm-project/lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp

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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
#include "llvm/ADT/ScopeExit.h"
// Project includes
#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/Symbol/ClangASTContext.h"
#include "lldb/Target/ProcessStructReader.h"
#include "lldb/Target/SectionLoadList.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"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
bool lldb_private::formatters::LibcxxOptionalSummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
ValueObjectSP valobj_sp(valobj.GetNonSyntheticValue());
if (!valobj_sp)
return false;
// An optional either contains a value or not, the member __engaged_ is
// a bool flag, it is true if the optional has a value and false otherwise.
ValueObjectSP engaged_sp(
valobj_sp->GetChildMemberWithName(ConstString("__engaged_"), true));
if (!engaged_sp)
return false;
llvm::StringRef engaged_as_cstring(
engaged_sp->GetValueAsUnsigned(0) == 1 ? "true" : "false");
stream.Printf(" Has Value=%s ", engaged_as_cstring.data());
return true;
}
bool lldb_private::formatters::LibcxxFunctionSummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
ValueObjectSP valobj_sp(valobj.GetNonSyntheticValue());
if (!valobj_sp)
return false;
// Member __f_ has type __base*, the contents of which will hold:
// 1) a vtable entry which may hold type information needed to discover the
// lambda being called
// 2) possibly hold a pointer to the callable object
// e.g.
//
// (lldb) frame var -R f_display
// (std::__1::function<void (int)>) f_display = {
// __buf_ = {
// …
// }
// __f_ = 0x00007ffeefbffa00
// }
// (lldb) memory read -fA 0x00007ffeefbffa00
// 0x7ffeefbffa00: ... `vtable for std::__1::__function::__func<void (*) ...
// 0x7ffeefbffa08: ... `print_num(int) at std_function_cppreference_exam ...
//
// We will be handling five cases below, std::function is wrapping:
//
// 1) a lambda we know at compile time. We will obtain the name of the lambda
// from the first template pameter from __func's vtable. We will look up
// the lambda's operator()() and obtain the line table entry.
// 2) a lambda we know at runtime. A pointer to the lambdas __invoke method
// will be stored after the vtable. We will obtain the lambdas name from
// this entry and lookup operator()() and obtain the line table entry.
// 3) a callable object via operator()(). We will obtain the name of the
// object from the first template parameter from __func's vtable. We will
// look up the objectc operator()() and obtain the line table entry.
// 4) a member function. A pointer to the function will stored after the
// we will obtain the name from this pointer.
// 5) a free function. A pointer to the function will stored after the vtable
// we will obtain the name from this pointer.
ValueObjectSP member__f_(
valobj_sp->GetChildMemberWithName(ConstString("__f_"), true));
lldb::addr_t member__f_pointer_value = member__f_->GetValueAsUnsigned(0);
ExecutionContext exe_ctx(valobj_sp->GetExecutionContextRef());
Process *process = exe_ctx.GetProcessPtr();
if (process == nullptr)
return false;
uint32_t address_size = process->GetAddressByteSize();
Status status;
// First item pointed to by __f_ should be the pointer to the vtable for
// a __base object.
lldb::addr_t vtable_address =
process->ReadPointerFromMemory(member__f_pointer_value, status);
if (status.Fail())
return false;
bool found_wrapped_function = false;
// Using scoped exit so we can use early return and still execute the default
// action in case we don't find the wrapper function. Otherwise we can't use
// early exit without duplicating code.
auto default_print_on_exit = llvm::make_scope_exit(
[&found_wrapped_function, &stream, &member__f_pointer_value]() {
if (!found_wrapped_function)
stream.Printf(" __f_ = %" PRIu64, member__f_pointer_value);
});
lldb::addr_t address_after_vtable = member__f_pointer_value + address_size;
// As commened above we may not have a function pointer but if we do we will
// need it.
lldb::addr_t possible_function_address =
process->ReadPointerFromMemory(address_after_vtable, status);
if (status.Fail())
return false;
Target &target = process->GetTarget();
if (target.GetSectionLoadList().IsEmpty())
return false;
Address vtable_addr_resolved;
SymbolContext sc;
Symbol *symbol;
if (!target.GetSectionLoadList().ResolveLoadAddress(vtable_address,
vtable_addr_resolved))
return false;
target.GetImages().ResolveSymbolContextForAddress(
vtable_addr_resolved, eSymbolContextEverything, sc);
symbol = sc.symbol;
if (symbol == NULL)
return false;
llvm::StringRef vtable_name(symbol->GetName().GetCString());
bool found_expected_start_string =
vtable_name.startswith("vtable for std::__1::__function::__func<");
if (!found_expected_start_string)
return false;
// Given case 1 or 3 we have a vtable name, we are want to extract the first
// template parameter
//
// ... __func<main::$_0, std::__1::allocator<main::$_0> ...
// ^^^^^^^^^
//
// We do this by find the first < and , and extracting in between.
//
// This covers the case of the lambda known at compile time.
//
size_t first_open_angle_bracket = vtable_name.find('<') + 1;
size_t first_comma = vtable_name.find_first_of(',');
llvm::StringRef first_template_parameter =
vtable_name.slice(first_open_angle_bracket, first_comma);
Address function_address_resolved;
// Setup for cases 2, 4 and 5 we have a pointer to a function after the
// vtable. We will use a process of elimination to drop through each case
// and obtain the data we need.
if (target.GetSectionLoadList().ResolveLoadAddress(
possible_function_address, function_address_resolved)) {
target.GetImages().ResolveSymbolContextForAddress(
function_address_resolved, eSymbolContextEverything, sc);
symbol = sc.symbol;
}
auto get_name = [&first_template_parameter, &symbol]() {
// Given case 1:
//
// main::$_0
//
// we want to append ::operator()()
if (first_template_parameter.contains("$_"))
return llvm::Regex::escape(first_template_parameter.str()) +
R"(::operator\(\)\(.*\))";
if (symbol != NULL &&
symbol->GetName().GetStringRef().contains("__invoke")) {
llvm::StringRef symbol_name = symbol->GetName().GetStringRef();
size_t pos2 = symbol_name.find_last_of(':');
// Given case 2:
//
// main::$_1::__invoke(...)
//
// We want to slice off __invoke(...) and append operator()()
std::string lambda_operator =
llvm::Regex::escape(symbol_name.slice(0, pos2 + 1).str()) +
R"(operator\(\)\(.*\))";
return lambda_operator;
}
// Case 3
return first_template_parameter.str() + R"(::operator\(\)\(.*\))";
;
};
std::string func_to_match = get_name();
SymbolContextList scl;
target.GetImages().FindFunctions(RegularExpression{func_to_match}, true, true,
true, scl);
// Case 1,2 or 3
if (scl.GetSize() >= 1) {
SymbolContext sc2 = scl[0];
AddressRange range;
sc2.GetAddressRange(eSymbolContextEverything, 0, false, range);
Address address = range.GetBaseAddress();
Address addr;
if (target.ResolveLoadAddress(address.GetCallableLoadAddress(&target),
addr)) {
LineEntry line_entry;
addr.CalculateSymbolContextLineEntry(line_entry);
found_wrapped_function = true;
if (first_template_parameter.contains("$_") ||
(symbol != NULL &&
symbol->GetName().GetStringRef().contains("__invoke"))) {
// Case 1 and 2
stream.Printf(" Lambda in File %s at Line %u",
line_entry.file.GetFilename().GetCString(),
line_entry.line);
} else {
// Case 3
stream.Printf(" Function in File %s at Line %u",
line_entry.file.GetFilename().GetCString(),
line_entry.line);
}
return true;
}
}
// Case 4 or 5
if (!symbol->GetName().GetStringRef().startswith("vtable for")) {
found_wrapped_function = true;
stream.Printf(" Function = %s ", symbol->GetName().GetCString());
return true;
}
return false;
}
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;
Status 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) 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));
if (!__i_) {
m_pair_ptr = nullptr;
return false;
}
CompilerType pair_type(__i_->GetCompilerType().GetTypeTemplateArgument(0));
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());
Status 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(llvm::ArrayRef<size_t>({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;
}
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