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//===-- sanitizer_flag_parser.h ---------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
//
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_FLAG_REGISTRY_H
#define SANITIZER_FLAG_REGISTRY_H
#include "sanitizer_internal_defs.h"
#include "sanitizer_libc.h"
#include "sanitizer_common.h"
namespace __sanitizer {
class FlagHandlerBase {
public:
virtual bool Parse(const char *value) { return false; }
// Write the C string representation of the current value (truncated to fit)
// into the buffer of size `size`. Returns false if truncation occurred and
// returns true otherwise.
virtual bool Format(char *buffer, uptr size) {
if (size > 0)
buffer[0] = '\0';
return false;
}
protected:
~FlagHandlerBase() {}
inline bool FormatString(char *buffer, uptr size, const char *str_to_use) {
uptr num_symbols_should_write =
internal_snprintf(buffer, size, "%s", str_to_use);
return num_symbols_should_write < size;
}
};
template <typename T>
class FlagHandler final : public FlagHandlerBase {
T *t_;
public:
explicit FlagHandler(T *t) : t_(t) {}
bool Parse(const char *value) final;
bool Format(char *buffer, uptr size) final;
};
inline bool ParseBool(const char *value, bool *b) {
if (internal_strcmp(value, "0") == 0 ||
internal_strcmp(value, "no") == 0 ||
internal_strcmp(value, "false") == 0) {
*b = false;
return true;
}
if (internal_strcmp(value, "1") == 0 ||
internal_strcmp(value, "yes") == 0 ||
internal_strcmp(value, "true") == 0) {
*b = true;
return true;
}
return false;
}
template <>
inline bool FlagHandler<bool>::Parse(const char *value) {
if (ParseBool(value, t_)) return true;
Printf("ERROR: Invalid value for bool option: '%s'\n", value);
return false;
}
template <>
inline bool FlagHandler<bool>::Format(char *buffer, uptr size) {
return FormatString(buffer, size, *t_ ? "true" : "false");
}
template <>
inline bool FlagHandler<HandleSignalMode>::Parse(const char *value) {
bool b;
if (ParseBool(value, &b)) {
*t_ = b ? kHandleSignalYes : kHandleSignalNo;
return true;
}
if (internal_strcmp(value, "2") == 0 ||
internal_strcmp(value, "exclusive") == 0) {
*t_ = kHandleSignalExclusive;
return true;
}
Printf("ERROR: Invalid value for signal handler option: '%s'\n", value);
return false;
}
template <>
inline bool FlagHandler<HandleSignalMode>::Format(char *buffer, uptr size) {
uptr num_symbols_should_write = internal_snprintf(buffer, size, "%d", *t_);
return num_symbols_should_write < size;
}
template <>
inline bool FlagHandler<const char *>::Parse(const char *value) {
*t_ = value;
return true;
}
template <>
inline bool FlagHandler<const char *>::Format(char *buffer, uptr size) {
return FormatString(buffer, size, *t_);
}
template <>
inline bool FlagHandler<int>::Parse(const char *value) {
const char *value_end;
*t_ = internal_simple_strtoll(value, &value_end, 10);
bool ok = *value_end == 0;
if (!ok) Printf("ERROR: Invalid value for int option: '%s'\n", value);
return ok;
}
template <>
inline bool FlagHandler<int>::Format(char *buffer, uptr size) {
uptr num_symbols_should_write = internal_snprintf(buffer, size, "%d", *t_);
return num_symbols_should_write < size;
}
template <>
inline bool FlagHandler<uptr>::Parse(const char *value) {
const char *value_end;
*t_ = internal_simple_strtoll(value, &value_end, 10);
bool ok = *value_end == 0;
if (!ok) Printf("ERROR: Invalid value for uptr option: '%s'\n", value);
return ok;
}
template <>
inline bool FlagHandler<uptr>::Format(char *buffer, uptr size) {
uptr num_symbols_should_write = internal_snprintf(buffer, size, "0x%zx", *t_);
return num_symbols_should_write < size;
}
template <>
inline bool FlagHandler<s64>::Parse(const char *value) {
const char *value_end;
*t_ = internal_simple_strtoll(value, &value_end, 10);
bool ok = *value_end == 0;
if (!ok) Printf("ERROR: Invalid value for s64 option: '%s'\n", value);
return ok;
}
template <>
inline bool FlagHandler<s64>::Format(char *buffer, uptr size) {
uptr num_symbols_should_write = internal_snprintf(buffer, size, "%lld", *t_);
return num_symbols_should_write < size;
}
class FlagParser {
static const int kMaxFlags = 200;
struct Flag {
const char *name;
const char *desc;
FlagHandlerBase *handler;
} *flags_;
int n_flags_;
const char *buf_;
uptr pos_;
public:
FlagParser();
void RegisterHandler(const char *name, FlagHandlerBase *handler,
const char *desc);
void ParseString(const char *s, const char *env_name = 0);
void ParseStringFromEnv(const char *env_name);
bool ParseFile(const char *path, bool ignore_missing);
void PrintFlagDescriptions();
static LowLevelAllocator Alloc;
private:
void fatal_error(const char *err);
bool is_space(char c);
void skip_whitespace();
void parse_flags(const char *env_option_name);
void parse_flag(const char *env_option_name);
bool run_handler(const char *name, const char *value);
char *ll_strndup(const char *s, uptr n);
};
template <typename T>
static void RegisterFlag(FlagParser *parser, const char *name, const char *desc,
T *var) {
FlagHandler<T> *fh = new (FlagParser::Alloc) FlagHandler<T>(var);
parser->RegisterHandler(name, fh, desc);
}
void ReportUnrecognizedFlags();
} // namespace __sanitizer
#endif // SANITIZER_FLAG_REGISTRY_H
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