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139 lines (118 loc) · 3.2 KB
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/**
*
* @file NullPointerRule.cpp
* @author Gaspard Kirira
*
* Copyright 2025, Gaspard Kirira. All rights reserved.
* https://github.com/vixcpp/vix
* Use of this source code is governed by a MIT license
* that can be found in the License file.
*
* Vix.cpp
*
*/
#include <vix/cli/errors/runtime/IRuntimeErrorRule.hpp>
#include <vix/cli/errors/runtime/RuntimeRuleUtils.hpp>
#include <filesystem>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <vix/cli/Style.hpp>
using namespace vix::cli::style;
namespace vix::cli::errors::runtime
{
namespace
{
std::string choose_message(const std::string &log)
{
(void)log;
return "null pointer dereference";
}
std::string choose_hint(const std::string &log)
{
(void)log;
return "check pointers before dereferencing them";
}
std::vector<std::string> source_patterns_for_null_pointer()
{
return {
"= nullptr",
"nullptr",
".get()",
"std::unique_ptr",
"std::shared_ptr",
"->",
"*",
};
}
bool looks_like_null_pointer_log(const std::string &log)
{
if (icontains(log, "null pointer") ||
icontains(log, "member access within null pointer") ||
icontains(log, "load of null pointer") ||
icontains(log, "store to null pointer"))
{
return true;
}
if (icontains(log, "SEGV_MAPERR") && icontains(log, "0x0"))
return true;
if (icontains(log, "address 0x0") &&
(icontains(log, "SIGSEGV") || icontains(log, "segmentation")))
{
return true;
}
return false;
}
} // namespace
class NullPointerRule final : public IRuntimeErrorRule
{
public:
bool match(
const std::string &log,
const std::filesystem::path &sourceFile) const override
{
(void)sourceFile;
return looks_like_null_pointer_log(log);
}
bool handle(
const std::string &log,
const std::filesystem::path &sourceFile) const override
{
const std::string message = choose_message(log);
RuntimeLocation location = find_best_runtime_location(log, sourceFile);
if (!location.valid())
{
location = find_best_runtime_location_or_source_hint(
log,
sourceFile,
source_patterns_for_null_pointer());
}
std::cerr << RED
<< "runtime error: "
<< message
<< RESET << "\n";
if (location.valid())
{
const auto err = make_runtime_location(
location.file,
location.line,
location.column,
message);
print_runtime_codeframe(err);
}
print_runtime_hints_and_at(
{
choose_hint(log),
"prefer references, std::optional, or smart pointers with explicit null checks",
},
make_at_text(location, sourceFile));
print_runtime_log_excerpt(log, 20);
return true;
}
};
std::unique_ptr<IRuntimeErrorRule> makeNullPointerRule()
{
return std::make_unique<NullPointerRule>();
}
} // namespace vix::cli::errors::runtime