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//===-- sanitizer_flag_parser.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
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_flag_parser.h"
#include "sanitizer_common.h"
#include "sanitizer_libc.h"
#include "sanitizer_flags.h"
#include "sanitizer_flag_parser.h"
namespace __sanitizer {
LowLevelAllocator FlagParser::Alloc;
class UnknownFlags {
static const int kMaxUnknownFlags = 20;
const char *unknown_flags_[kMaxUnknownFlags];
int n_unknown_flags_;
public:
void Add(const char *name) {
CHECK_LT(n_unknown_flags_, kMaxUnknownFlags);
unknown_flags_[n_unknown_flags_++] = name;
}
void Report() {
if (!n_unknown_flags_) return;
Printf("WARNING: found %d unrecognized flag(s):\n", n_unknown_flags_);
for (int i = 0; i < n_unknown_flags_; ++i)
Printf(" %s\n", unknown_flags_[i]);
n_unknown_flags_ = 0;
}
};
UnknownFlags unknown_flags;
void ReportUnrecognizedFlags() {
unknown_flags.Report();
}
char *FlagParser::ll_strndup(const char *s, uptr n) {
uptr len = internal_strnlen(s, n);
char *s2 = (char*)Alloc.Allocate(len + 1);
internal_memcpy(s2, s, len);
s2[len] = 0;
return s2;
}
void FlagParser::PrintFlagDescriptions() {
char buffer[128];
buffer[sizeof(buffer) - 1] = '\0';
Printf("Available flags for %s:\n", SanitizerToolName);
for (int i = 0; i < n_flags_; ++i) {
bool truncated = !(flags_[i].handler->Format(buffer, sizeof(buffer)));
CHECK_EQ(buffer[sizeof(buffer) - 1], '\0');
const char *truncation_str = truncated ? " Truncated" : "";
Printf("\t%s\n\t\t- %s (Current Value%s: %s)\n", flags_[i].name,
flags_[i].desc, truncation_str, buffer);
}
}
void FlagParser::fatal_error(const char *err) {
Printf("%s: ERROR: %s\n", SanitizerToolName, err);
Die();
}
bool FlagParser::is_space(char c) {
return c == ' ' || c == ',' || c == ':' || c == '\n' || c == '\t' ||
c == '\r';
}
void FlagParser::skip_whitespace() {
while (is_space(buf_[pos_])) ++pos_;
}
void FlagParser::parse_flag(const char *env_option_name) {
uptr name_start = pos_;
while (buf_[pos_] != 0 && buf_[pos_] != '=' && !is_space(buf_[pos_])) ++pos_;
if (buf_[pos_] != '=') {
if (env_option_name) {
Printf("%s: ERROR: expected '=' in %s\n", SanitizerToolName,
env_option_name);
Die();
} else {
fatal_error("expected '='");
}
}
char *name = ll_strndup(buf_ + name_start, pos_ - name_start);
uptr value_start = ++pos_;
char *value;
if (buf_[pos_] == '\'' || buf_[pos_] == '"') {
char quote = buf_[pos_++];
while (buf_[pos_] != 0 && buf_[pos_] != quote) ++pos_;
if (buf_[pos_] == 0) fatal_error("unterminated string");
value = ll_strndup(buf_ + value_start + 1, pos_ - value_start - 1);
++pos_; // consume the closing quote
} else {
while (buf_[pos_] != 0 && !is_space(buf_[pos_])) ++pos_;
if (buf_[pos_] != 0 && !is_space(buf_[pos_]))
fatal_error("expected separator or eol");
value = ll_strndup(buf_ + value_start, pos_ - value_start);
}
bool res = run_handler(name, value);
if (!res) fatal_error("Flag parsing failed.");
}
void FlagParser::parse_flags(const char *env_option_name) {
while (true) {
skip_whitespace();
if (buf_[pos_] == 0) break;
parse_flag(env_option_name);
}
// Do a sanity check for certain flags.
if (common_flags_dont_use.malloc_context_size < 1)
common_flags_dont_use.malloc_context_size = 1;
}
void FlagParser::ParseStringFromEnv(const char *env_name) {
const char *env = GetEnv(env_name);
VPrintf(1, "%s: %s\n", env_name, env ? env : "<empty>");
ParseString(env, env_name);
}
void FlagParser::ParseString(const char *s, const char *env_option_name) {
if (!s) return;
// Backup current parser state to allow nested ParseString() calls.
const char *old_buf_ = buf_;
uptr old_pos_ = pos_;
buf_ = s;
pos_ = 0;
parse_flags(env_option_name);
buf_ = old_buf_;
pos_ = old_pos_;
}
bool FlagParser::ParseFile(const char *path, bool ignore_missing) {
static const uptr kMaxIncludeSize = 1 << 15;
char *data;
uptr data_mapped_size;
error_t err;
uptr len;
if (!ReadFileToBuffer(path, &data, &data_mapped_size, &len,
Max(kMaxIncludeSize, GetPageSizeCached()), &err)) {
if (ignore_missing)
return true;
Printf("Failed to read options from '%s': error %d\n", path, err);
return false;
}
ParseString(data, path);
UnmapOrDie(data, data_mapped_size);
return true;
}
bool FlagParser::run_handler(const char *name, const char *value) {
for (int i = 0; i < n_flags_; ++i) {
if (internal_strcmp(name, flags_[i].name) == 0)
return flags_[i].handler->Parse(value);
}
// Unrecognized flag. This is not a fatal error, we may print a warning later.
unknown_flags.Add(name);
return true;
}
void FlagParser::RegisterHandler(const char *name, FlagHandlerBase *handler,
const char *desc) {
CHECK_LT(n_flags_, kMaxFlags);
flags_[n_flags_].name = name;
flags_[n_flags_].desc = desc;
flags_[n_flags_].handler = handler;
++n_flags_;
}
FlagParser::FlagParser() : n_flags_(0), buf_(nullptr), pos_(0) {
flags_ = (Flag *)Alloc.Allocate(sizeof(Flag) * kMaxFlags);
}
} // namespace __sanitizer
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