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parse_flags.cpp
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parse_flags.cpp
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#include "parse_flags.h"
using namespace __otfcpt;
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: %s found %d unrecognized flag(s):\n", SanitizerToolName,
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 __otfcpt::ReportUnrecognizedFlags() { unknown_flags.Report(); }
char *FlagParser::ll_strndup(const char *s, uptr n) {
uptr len = strnlen(s, n);
char *s2 = (char *)malloc(len + 1);
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);
}
}
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::run_handler(const char *name, const char *value) {
for (int i = 0; i < n_flags_; ++i) {
if (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 *)malloc(sizeof(Flag) * kMaxFlags);
}
OtfcptFlags __otfcpt::otfcpt_flags_dont_use;
const char *__otfcpt::SanitizerToolName = "OFTCPT";
std::atomic<uint32_t> __otfcpt::current_verbosity{0};
void OtfcptFlags::SetDefaults() {
#define PARSE_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
#include "parse_flags.inc"
#undef PARSE_FLAG
}
void OtfcptFlags::CopyFrom(const OtfcptFlags &other) {
memcpy(this, &other, sizeof(*this));
}
static void RegisterOtfcptFlags(FlagParser *parser, OtfcptFlags *f){
#define PARSE_FLAG(Type, Name, DefaultValue, Description) \
RegisterFlag(parser, #Name, Description, &f->Name);
#include "parse_flags.inc"
#undef PARSE_FLAG
}
SANITIZER_INTERFACE_WEAK_DEF(const char *, __otfcpt_default_options, void) {
return "";
}
void __otfcpt::InitializeOtfcptFlags() {
static bool initOnce{false};
if (initOnce)
return;
initOnce = true;
OtfcptFlags *f = get_otfcpt_flags();
f->SetDefaults();
FlagParser parser;
RegisterOtfcptFlags(&parser, f);
parser.ParseString(__otfcpt_default_options());
parser.ParseStringFromEnv(ANALYSIS_FLAGS);
ReportUnrecognizedFlags();
if (f->help)
parser.PrintFlagDescriptions();
if (f->log_path && f->verbose) {
if (strcmp("stdout", f->log_path) == 0) {
f->output = stdout;
} else if (strcmp("stderr", f->log_path) == 0) {
f->output = stderr;
} else {
auto len = strlen(f->log_path);
char *tempath = (char *)malloc(len + 15);
sprintf(tempath, "%s.%i", f->log_path, getpid());
f->output = fopen(tempath, "w");
free(tempath);
}
}
}
void NORETURN __otfcpt::Die() {
if (get_otfcpt_flags()->abort_on_error)
abort();
exit(get_otfcpt_flags()->exitcode);
}