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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "addr_to_symbol.h"
#include <vespa/vespalib/util/classname.h>
#include <dlfcn.h>
#include <llvm/Object/ObjectFile.h>
using vespalib::demangle;
using llvm::object::ObjectFile;
using SymbolType = llvm::object::SymbolRef::Type;
namespace vespalib::eval {
namespace {
void my_local_test_symbol() {}
bool symbol_is_data_or_function(SymbolType type)
{
return ((type == SymbolType::ST_Data) || (type == SymbolType::ST_Function));
}
} // <unnamed>
vespalib::string addr_to_symbol(const void *addr) {
if (addr == nullptr) {
return {"<nullptr>"};
}
Dl_info info;
memset(&info, 0, sizeof(info));
if (dladdr(addr, &info) == 0) {
// address not in any shared object
return {"<invalid>"};
}
if (info.dli_sname != nullptr) {
// address of global symbol
return demangle(info.dli_sname);
}
// find addr offset into shared object
uint64_t offset = ((const char *)addr) - ((const char *)info.dli_fbase);
// use llvm to look up local symbols...
auto file = ObjectFile::createObjectFile(info.dli_fname);
if (!file) {
return {"<object_error>"};
}
auto symbols = file.get().getBinary()->symbols();
for (const auto &symbol: symbols) {
auto sym_name = symbol.getName();
auto sym_addr = symbol.getAddress();
auto sym_type = symbol.getType();
if (sym_name && sym_addr && sym_type &&
symbol_is_data_or_function(*sym_type) &&
(*sym_addr == offset)) {
return demangle(sym_name->str().c_str());
}
}
// could not resolve symbol
return {"<unknown>"};
}
const void *get_addr_of_local_test_symbol() {
return (const void *) my_local_test_symbol;
}
}
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