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//===-- sanitizer_flags.cc ------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
//
//===----------------------------------------------------------------------===//
#include "sanitizer_flags.h"
#include "sanitizer_common.h"
#include "sanitizer_libc.h"
namespace __sanitizer {
CommonFlags common_flags_dont_use;
void SetCommonFlagsDefaults(CommonFlags *f) {
f->symbolize = true;
f->external_symbolizer_path = 0;
f->allow_addr2line = false;
f->strip_path_prefix = "";
f->fast_unwind_on_fatal = false;
f->fast_unwind_on_malloc = true;
f->handle_ioctl = false;
f->malloc_context_size = 1;
f->log_path = "stderr";
f->verbosity = 0;
f->detect_leaks = false;
f->leak_check_at_exit = true;
f->allocator_may_return_null = false;
f->print_summary = true;
f->check_printf = false;
// TODO(glider): tools may want to set different defaults for handle_segv.
f->handle_segv = SANITIZER_NEEDS_SEGV;
f->allow_user_segv_handler = false;
f->use_sigaltstack = false;
f->detect_deadlocks = false;
f->clear_shadow_mmap_threshold = 64 * 1024;
}
void ParseCommonFlagsFromString(CommonFlags *f, const char *str) {
ParseFlag(str, &f->symbolize, "symbolize");
ParseFlag(str, &f->external_symbolizer_path, "external_symbolizer_path");
ParseFlag(str, &f->allow_addr2line, "allow_addr2line");
ParseFlag(str, &f->strip_path_prefix, "strip_path_prefix");
ParseFlag(str, &f->fast_unwind_on_fatal, "fast_unwind_on_fatal");
ParseFlag(str, &f->fast_unwind_on_malloc, "fast_unwind_on_malloc");
ParseFlag(str, &f->handle_ioctl, "handle_ioctl");
ParseFlag(str, &f->malloc_context_size, "malloc_context_size");
ParseFlag(str, &f->log_path, "log_path");
ParseFlag(str, &f->verbosity, "verbosity");
ParseFlag(str, &f->detect_leaks, "detect_leaks");
ParseFlag(str, &f->leak_check_at_exit, "leak_check_at_exit");
ParseFlag(str, &f->allocator_may_return_null, "allocator_may_return_null");
ParseFlag(str, &f->print_summary, "print_summary");
ParseFlag(str, &f->check_printf, "check_printf");
ParseFlag(str, &f->handle_segv, "handle_segv");
ParseFlag(str, &f->allow_user_segv_handler, "allow_user_segv_handler");
ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack");
ParseFlag(str, &f->detect_deadlocks, "detect_deadlocks");
ParseFlag(str, &f->clear_shadow_mmap_threshold,
"clear_shadow_mmap_threshold");
// Do a sanity check for certain flags.
if (f->malloc_context_size < 1)
f->malloc_context_size = 1;
}
static bool GetFlagValue(const char *env, const char *name,
const char **value, int *value_length) {
if (env == 0)
return false;
const char *pos = 0;
for (;;) {
pos = internal_strstr(env, name);
if (pos == 0)
return false;
if (pos != env && ((pos[-1] >= 'a' && pos[-1] <= 'z') || pos[-1] == '_')) {
// Seems to be middle of another flag name or value.
env = pos + 1;
continue;
}
break;
}
pos += internal_strlen(name);
const char *end;
if (pos[0] != '=') {
end = pos;
} else {
pos += 1;
if (pos[0] == '"') {
pos += 1;
end = internal_strchr(pos, '"');
} else if (pos[0] == '\'') {
pos += 1;
end = internal_strchr(pos, '\'');
} else {
// Read until the next space or colon.
end = pos + internal_strcspn(pos, " :");
}
if (end == 0)
end = pos + internal_strlen(pos);
}
*value = pos;
*value_length = end - pos;
return true;
}
static bool StartsWith(const char *flag, int flag_length, const char *value) {
if (!flag || !value)
return false;
int value_length = internal_strlen(value);
return (flag_length >= value_length) &&
(0 == internal_strncmp(flag, value, value_length));
}
void ParseFlag(const char *env, bool *flag, const char *name) {
const char *value;
int value_length;
if (!GetFlagValue(env, name, &value, &value_length))
return;
if (StartsWith(value, value_length, "0") ||
StartsWith(value, value_length, "no") ||
StartsWith(value, value_length, "false"))
*flag = false;
if (StartsWith(value, value_length, "1") ||
StartsWith(value, value_length, "yes") ||
StartsWith(value, value_length, "true"))
*flag = true;
}
void ParseFlag(const char *env, int *flag, const char *name) {
const char *value;
int value_length;
if (!GetFlagValue(env, name, &value, &value_length))
return;
*flag = static_cast<int>(internal_atoll(value));
}
void ParseFlag(const char *env, uptr *flag, const char *name) {
const char *value;
int value_length;
if (!GetFlagValue(env, name, &value, &value_length))
return;
*flag = static_cast<uptr>(internal_atoll(value));
}
static LowLevelAllocator allocator_for_flags;
void ParseFlag(const char *env, const char **flag, const char *name) {
const char *value;
int value_length;
if (!GetFlagValue(env, name, &value, &value_length))
return;
// Copy the flag value. Don't use locks here, as flags are parsed at
// tool startup.
char *value_copy = (char*)(allocator_for_flags.Allocate(value_length + 1));
internal_memcpy(value_copy, value, value_length);
value_copy[value_length] = '\0';
*flag = value_copy;
}
} // namespace __sanitizer
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