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//===-- GoFormatterFunctions.cpp---------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
// C++ Includes
#include <map>
// Other libraries and framework includes
// Project includes
#include "GoFormatterFunctions.h"
#include "lldb/DataFormatters/FormattersHelpers.h"
#include "lldb/DataFormatters/StringPrinter.h"
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::formatters;
namespace {
class GoSliceSyntheticFrontEnd : public SyntheticChildrenFrontEnd {
public:
GoSliceSyntheticFrontEnd(ValueObject &valobj)
: SyntheticChildrenFrontEnd(valobj) {
Update();
}
~GoSliceSyntheticFrontEnd() override = default;
size_t CalculateNumChildren() override { return m_len; }
lldb::ValueObjectSP GetChildAtIndex(size_t idx) override {
if (idx < m_len) {
ValueObjectSP &cached = m_children[idx];
if (!cached) {
StreamString idx_name;
idx_name.Printf("[%" PRIu64 "]", (uint64_t)idx);
lldb::addr_t object_at_idx = m_base_data_address;
object_at_idx += idx * m_type.GetByteSize(nullptr);
cached = CreateValueObjectFromAddress(
idx_name.GetData(), object_at_idx,
m_backend.GetExecutionContextRef(), m_type);
}
return cached;
}
return ValueObjectSP();
}
bool Update() override {
size_t old_count = m_len;
ConstString array_const_str("array");
ValueObjectSP array_sp =
m_backend.GetChildMemberWithName(array_const_str, true);
if (!array_sp) {
m_children.clear();
return old_count == 0;
}
m_type = array_sp->GetCompilerType().GetPointeeType();
m_base_data_address = array_sp->GetPointerValue();
ConstString len_const_str("len");
ValueObjectSP len_sp =
m_backend.GetChildMemberWithName(len_const_str, true);
if (len_sp) {
m_len = len_sp->GetValueAsUnsigned(0);
m_children.clear();
}
return old_count == m_len;
}
bool MightHaveChildren() override { return true; }
size_t GetIndexOfChildWithName(const ConstString &name) override {
return ExtractIndexFromString(name.AsCString());
}
private:
CompilerType m_type;
lldb::addr_t m_base_data_address;
size_t m_len;
std::map<size_t, lldb::ValueObjectSP> m_children;
};
} // anonymous namespace
bool lldb_private::formatters::GoStringSummaryProvider(
ValueObject &valobj, Stream &stream, const TypeSummaryOptions &opts) {
ProcessSP process_sp = valobj.GetProcessSP();
if (!process_sp)
return false;
if (valobj.IsPointerType()) {
Error err;
ValueObjectSP deref = valobj.Dereference(err);
if (!err.Success())
return false;
return GoStringSummaryProvider(*deref, stream, opts);
}
ConstString str_name("str");
ConstString len_name("len");
ValueObjectSP data_sp = valobj.GetChildMemberWithName(str_name, true);
ValueObjectSP len_sp = valobj.GetChildMemberWithName(len_name, true);
if (!data_sp || !len_sp)
return false;
bool success;
lldb::addr_t valobj_addr = data_sp->GetValueAsUnsigned(0, &success);
if (!success)
return false;
uint64_t length = len_sp->GetValueAsUnsigned(0);
if (length == 0) {
stream.Printf("\"\"");
return true;
}
StringPrinter::ReadStringAndDumpToStreamOptions options(valobj);
options.SetLocation(valobj_addr);
options.SetProcessSP(process_sp);
options.SetStream(&stream);
options.SetSourceSize(length);
options.SetNeedsZeroTermination(false);
options.SetLanguage(eLanguageTypeGo);
if (!StringPrinter::ReadStringAndDumpToStream<
StringPrinter::StringElementType::UTF8>(options)) {
stream.Printf("Summary Unavailable");
return true;
}
return true;
}
SyntheticChildrenFrontEnd *
lldb_private::formatters::GoSliceSyntheticFrontEndCreator(
CXXSyntheticChildren *, lldb::ValueObjectSP valobj_sp) {
if (!valobj_sp)
return nullptr;
lldb::ProcessSP process_sp(valobj_sp->GetProcessSP());
if (!process_sp)
return nullptr;
return new GoSliceSyntheticFrontEnd(*valobj_sp);
}
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