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//===-- RichManglingContext.cpp -------------------------------------------===//
//
// 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/Core/RichManglingContext.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/Logging.h"
#include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
#include "llvm/ADT/StringRef.h"
using namespace lldb;
using namespace lldb_private;
// RichManglingContext
RichManglingContext::~RichManglingContext() {
std::free(m_ipd_buf);
ResetCxxMethodParser();
}
void RichManglingContext::ResetCxxMethodParser() {
// If we want to support parsers for other languages some day, we need a
// switch here to delete the correct parser type.
if (m_cxx_method_parser.hasValue()) {
assert(m_provider == PluginCxxLanguage);
delete get<CPlusPlusLanguage::MethodName>(m_cxx_method_parser);
m_cxx_method_parser.reset();
}
}
void RichManglingContext::ResetProvider(InfoProvider new_provider) {
ResetCxxMethodParser();
assert(new_provider != None && "Only reset to a valid provider");
m_provider = new_provider;
}
bool RichManglingContext::FromItaniumName(ConstString mangled) {
bool err = m_ipd.partialDemangle(mangled.GetCString());
if (!err) {
ResetProvider(ItaniumPartialDemangler);
}
if (Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_DEMANGLE)) {
if (!err) {
ParseFullName();
LLDB_LOG(log, "demangled itanium: {0} -> \"{1}\"", mangled, m_ipd_buf);
} else {
LLDB_LOG(log, "demangled itanium: {0} -> error: failed to demangle",
mangled);
}
}
return !err; // true == success
}
bool RichManglingContext::FromCxxMethodName(ConstString demangled) {
ResetProvider(PluginCxxLanguage);
m_cxx_method_parser = new CPlusPlusLanguage::MethodName(demangled);
return true;
}
bool RichManglingContext::IsCtorOrDtor() const {
assert(m_provider != None && "Initialize a provider first");
switch (m_provider) {
case ItaniumPartialDemangler:
return m_ipd.isCtorOrDtor();
case PluginCxxLanguage: {
// We can only check for destructors here.
auto base_name =
get<CPlusPlusLanguage::MethodName>(m_cxx_method_parser)->GetBasename();
return base_name.startswith("~");
}
case None:
return false;
}
llvm_unreachable("Fully covered switch above!");
}
bool RichManglingContext::IsFunction() const {
assert(m_provider != None && "Initialize a provider first");
switch (m_provider) {
case ItaniumPartialDemangler:
return m_ipd.isFunction();
case PluginCxxLanguage:
return get<CPlusPlusLanguage::MethodName>(m_cxx_method_parser)->IsValid();
case None:
return false;
}
llvm_unreachable("Fully covered switch above!");
}
void RichManglingContext::processIPDStrResult(char *ipd_res, size_t res_size) {
// Error case: Clear the buffer.
if (LLVM_UNLIKELY(ipd_res == nullptr)) {
assert(res_size == m_ipd_buf_size &&
"Failed IPD queries keep the original size in the N parameter");
m_ipd_buf[0] = '\0';
m_buffer = llvm::StringRef(m_ipd_buf, 0);
return;
}
// IPD's res_size includes null terminator.
assert(ipd_res[res_size - 1] == '\0' &&
"IPD returns null-terminated strings and we rely on that");
// Update buffer/size on realloc.
if (LLVM_UNLIKELY(ipd_res != m_ipd_buf || res_size > m_ipd_buf_size)) {
m_ipd_buf = ipd_res; // std::realloc freed or reused the old buffer.
m_ipd_buf_size = res_size; // May actually be bigger, but we can't know.
if (Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_DEMANGLE))
LLDB_LOG(log, "ItaniumPartialDemangler Realloc: new buffer size is {0}",
m_ipd_buf_size);
}
// 99% case: Just remember the string length.
m_buffer = llvm::StringRef(m_ipd_buf, res_size - 1);
}
void RichManglingContext::ParseFunctionBaseName() {
assert(m_provider != None && "Initialize a provider first");
switch (m_provider) {
case ItaniumPartialDemangler: {
auto n = m_ipd_buf_size;
auto buf = m_ipd.getFunctionBaseName(m_ipd_buf, &n);
processIPDStrResult(buf, n);
return;
}
case PluginCxxLanguage:
m_buffer =
get<CPlusPlusLanguage::MethodName>(m_cxx_method_parser)->GetBasename();
return;
case None:
return;
}
}
void RichManglingContext::ParseFunctionDeclContextName() {
assert(m_provider != None && "Initialize a provider first");
switch (m_provider) {
case ItaniumPartialDemangler: {
auto n = m_ipd_buf_size;
auto buf = m_ipd.getFunctionDeclContextName(m_ipd_buf, &n);
processIPDStrResult(buf, n);
return;
}
case PluginCxxLanguage:
m_buffer =
get<CPlusPlusLanguage::MethodName>(m_cxx_method_parser)->GetContext();
return;
case None:
return;
}
}
void RichManglingContext::ParseFullName() {
assert(m_provider != None && "Initialize a provider first");
switch (m_provider) {
case ItaniumPartialDemangler: {
auto n = m_ipd_buf_size;
auto buf = m_ipd.finishDemangle(m_ipd_buf, &n);
processIPDStrResult(buf, n);
return;
}
case PluginCxxLanguage:
m_buffer = get<CPlusPlusLanguage::MethodName>(m_cxx_method_parser)
->GetFullName()
.GetStringRef();
return;
case None:
return;
}
}
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