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[ASan] Move flag parsing logic to asan_flags.cc. NFC. 

llvm-svn: 224450
This commit is contained in:
Alexey Samsonov 2014-12-17 19:31:39 +00:00
parent 513955c487
commit 9aca5e07ec
6 changed files with 309 additions and 277 deletions
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1
compiler-rt/lib/asan/CMakeLists.txt
View File

@ -5,6 +5,7 @@ set(ASAN_SOURCES
asan_activation.cc
asan_debugging.cc
asan_fake_stack.cc
asan_flags.cc
asan_globals.cc
asan_interceptors.cc
asan_linux.cc

9
compiler-rt/lib/asan/asan_activation.cc
View File

@ -66,7 +66,14 @@ void AsanActivate() {
flags()->alloc_dealloc_mismatch =
asan_deactivated_flags.alloc_dealloc_mismatch;
ParseExtraActivationFlags();
// FIXME: Avoid modifying global common_flags() and flags() and restrict the
// set of supported flags that can be provided in activation.
char buf[100];
GetExtraActivationFlags(buf, sizeof(buf));
ParseCommonFlagsFromString(common_flags(), buf);
ParseFlagsFromString(flags(), buf);
if (buf[0] != '\0')
VReport(1, "Extra activation flags: %s\n", buf);
SetCanPoisonMemory(asan_deactivated_flags.poison_heap);
SetMallocContextSize(asan_deactivated_flags.malloc_context_size);

297
compiler-rt/lib/asan/asan_flags.cc Normal file
View File

@ -0,0 +1,297 @@
//===-- asan_flags.cc -------------------------------------------*- C++ -*-===//
//
// 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 AddressSanitizer, an address sanity checker.
//
// ASan flag parsing logic.
//===----------------------------------------------------------------------===//
#include "asan_activation.h"
#include "asan_flags.h"
#include "asan_interface_internal.h"
#include "asan_stack.h"
#include "lsan/lsan_common.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_flags.h"
namespace __asan {
Flags asan_flags_dont_use_directly; // use via flags().
static const char *MaybeCallAsanDefaultOptions() {
return (&__asan_default_options) ? __asan_default_options() : "";
}
static const char *MaybeUseAsanDefaultOptionsCompileDefinition() {
#ifdef ASAN_DEFAULT_OPTIONS
// Stringize the macro value.
# define ASAN_STRINGIZE(x) #x
# define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options)
return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS);
#else
return "";
#endif
}
void ParseFlagsFromString(Flags *f, const char *str) {
// Please write meaningful flag descriptions when adding new flags.
ParseFlag(str, &f->quarantine_size, "quarantine_size",
"Size (in bytes) of quarantine used to detect use-after-free "
"errors. Lower value may reduce memory usage but increase the "
"chance of false negatives.");
ParseFlag(str, &f->redzone, "redzone",
"Minimal size (in bytes) of redzones around heap objects. "
"Requirement: redzone >= 16, is a power of two.");
ParseFlag(str, &f->max_redzone, "max_redzone",
"Maximal size (in bytes) of redzones around heap objects.");
CHECK_GE(f->redzone, 16);
CHECK_GE(f->max_redzone, f->redzone);
CHECK_LE(f->max_redzone, 2048);
CHECK(IsPowerOfTwo(f->redzone));
CHECK(IsPowerOfTwo(f->max_redzone));
ParseFlag(str, &f->debug, "debug",
"If set, prints some debugging information and does additional checks.");
ParseFlag(str, &f->report_globals, "report_globals",
"Controls the way to handle globals (0 - don't detect buffer overflow on "
"globals, 1 - detect buffer overflow, 2 - print data about registered "
"globals).");
ParseFlag(str, &f->check_initialization_order,
"check_initialization_order",
"If set, attempts to catch initialization order issues.");
ParseFlag(str, &f->replace_str, "replace_str",
"If set, uses custom wrappers and replacements for libc string functions "
"to find more errors.");
ParseFlag(str, &f->replace_intrin, "replace_intrin",
"If set, uses custom wrappers for memset/memcpy/memmove intinsics.");
ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free",
"Ignore invalid free() calls to work around some bugs. Used on OS X "
"only.");
ParseFlag(str, &f->detect_stack_use_after_return,
"detect_stack_use_after_return",
"Enables stack-use-after-return checking at run-time.");
ParseFlag(str, &f->min_uar_stack_size_log, "min_uar_stack_size_log",
"Minimum fake stack size log.");
ParseFlag(str, &f->max_uar_stack_size_log, "max_uar_stack_size_log",
"Maximum fake stack size log.");
ParseFlag(str, &f->uar_noreserve, "uar_noreserve",
"Use mmap with 'norserve' flag to allocate fake stack.");
ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size",
"ASan allocator flag. max_malloc_fill_size is the maximal amount of "
"bytes that will be filled with malloc_fill_byte on malloc.");
ParseFlag(str, &f->malloc_fill_byte, "malloc_fill_byte",
"Value used to fill the newly allocated memory.");
ParseFlag(str, &f->exitcode, "exitcode",
"Override the program exit status if the tool found an error.");
ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning",
"If set, user may manually mark memory regions as poisoned or "
"unpoisoned.");
ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying",
"Number of seconds to sleep between printing an error report and "
"terminating the program. Useful for debugging purposes (e.g. when one "
"needs to attach gdb).");
ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size",
"Allows the users to work around the bug in Nvidia drivers prior to "
"295.*.");
ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit",
"If set, explicitly unmaps the (huge) shadow at exit.");
ParseFlag(str, &f->abort_on_error, "abort_on_error",
"If set, the tool calls abort() instead of _exit() after printing the "
"error report.");
ParseFlag(str, &f->print_stats, "print_stats",
"Print various statistics after printing an error message or if "
"atexit=1.");
ParseFlag(str, &f->print_legend, "print_legend",
"Print the legend for the shadow bytes.");
ParseFlag(str, &f->atexit, "atexit",
"If set, prints ASan exit stats even after program terminates "
"successfully.");
ParseFlag(str, &f->allow_reexec, "allow_reexec",
"Allow the tool to re-exec the program. This may interfere badly with "
"the debugger.");
ParseFlag(str, &f->print_full_thread_history,
"print_full_thread_history",
"If set, prints thread creation stacks for the threads involved in the "
"report and their ancestors up to the main thread.");
ParseFlag(str, &f->poison_heap, "poison_heap",
"Poison (or not) the heap memory on [de]allocation. Zero value is useful "
"for benchmarking the allocator or instrumentator.");
ParseFlag(str, &f->poison_array_cookie, "poison_array_cookie",
"Poison (or not) the array cookie after operator new[].");
ParseFlag(str, &f->poison_partial, "poison_partial",
"If true, poison partially addressable 8-byte aligned words "
"(default=true). This flag affects heap and global buffers, but not "
"stack buffers.");
ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch",
"Report errors on malloc/delete, new/free, new/delete[], etc.");
ParseFlag(str, &f->new_delete_type_mismatch, "new_delete_type_mismatch",
"Report errors on mismatch betwen size of new and delete.");
ParseFlag(str, &f->strict_memcmp, "strict_memcmp",
"If true, assume that memcmp(p1, p2, n) always reads n bytes before "
"comparing p1 and p2.");
ParseFlag(str, &f->strict_init_order, "strict_init_order",
"If true, assume that dynamic initializers can never access globals from "
"other modules, even if the latter are already initialized.");
ParseFlag(str, &f->start_deactivated, "start_deactivated",
"If true, ASan tweaks a bunch of other flags (quarantine, redzone, heap "
"poisoning) to reduce memory consumption as much as possible, and "
"restores them to original values when the first instrumented module is "
"loaded into the process. This is mainly intended to be used on "
"Android. ");
ParseFlag(str, &f->detect_invalid_pointer_pairs,
"detect_invalid_pointer_pairs",
"If non-zero, try to detect operations like <, <=, >, >= and - on "
"invalid pointer pairs (e.g. when pointers belong to different objects). "
"The bigger the value the harder we try.");
ParseFlag(str, &f->detect_container_overflow,
"detect_container_overflow",
"If true, honor the container overflow annotations. "
"See https://code.google.com/p/address-sanitizer/wiki/ContainerOverflow");
ParseFlag(str, &f->detect_odr_violation, "detect_odr_violation",
"If >=2, detect violation of One-Definition-Rule (ODR); "
"If ==1, detect ODR-violation only if the two variables "
"have different sizes");
ParseFlag(str, &f->dump_instruction_bytes, "dump_instruction_bytes",
"If true, dump 16 bytes starting at the instruction that caused SEGV");
}
void InitializeFlags(Flags *f) {
CommonFlags *cf = common_flags();
SetCommonFlagsDefaults(cf);
cf->detect_leaks = CAN_SANITIZE_LEAKS;
cf->external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
cf->malloc_context_size = kDefaultMallocContextSize;
cf->intercept_tls_get_addr = true;
cf->coverage = false;
internal_memset(f, 0, sizeof(*f));
f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28;
f->redzone = 16;
f->max_redzone = 2048;
f->debug = false;
f->report_globals = 1;
f->check_initialization_order = false;
f->replace_str = true;
f->replace_intrin = true;
f->mac_ignore_invalid_free = false;
f->detect_stack_use_after_return = false; // Also needs the compiler flag.
f->min_uar_stack_size_log = 16; // We can't do smaller anyway.
f->max_uar_stack_size_log = 20; // 1Mb per size class, i.e. ~11Mb per thread.
f->uar_noreserve = false;
f->max_malloc_fill_size = 0x1000; // By default, fill only the first 4K.
f->malloc_fill_byte = 0xbe;
f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE;
f->allow_user_poisoning = true;
f->sleep_before_dying = 0;
f->check_malloc_usable_size = true;
f->unmap_shadow_on_exit = false;
f->abort_on_error = false;
f->print_stats = false;
f->print_legend = true;
f->atexit = false;
f->allow_reexec = true;
f->print_full_thread_history = true;
f->poison_heap = true;
f->poison_array_cookie = true;
f->poison_partial = true;
// Turn off alloc/dealloc mismatch checker on Mac and Windows for now.
// https://code.google.com/p/address-sanitizer/issues/detail?id=131
// https://code.google.com/p/address-sanitizer/issues/detail?id=309
// TODO(glider,timurrrr): Fix known issues and enable this back.
f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0) && (SANITIZER_WINDOWS == 0);
f->new_delete_type_mismatch = true;
f->strict_memcmp = true;
f->strict_init_order = false;
f->start_deactivated = false;
f->detect_invalid_pointer_pairs = 0;
f->detect_container_overflow = true;
f->detect_odr_violation = 2;
f->dump_instruction_bytes = false;
// Override from compile definition.
const char *compile_def = MaybeUseAsanDefaultOptionsCompileDefinition();
ParseCommonFlagsFromString(cf, compile_def);
ParseFlagsFromString(f, compile_def);
// Override from user-specified string.
const char *default_options = MaybeCallAsanDefaultOptions();
ParseCommonFlagsFromString(cf, default_options);
ParseFlagsFromString(f, default_options);
VReport(1, "Using the defaults from __asan_default_options: %s\n",
MaybeCallAsanDefaultOptions());
// Override from command line.
if (const char *env = GetEnv("ASAN_OPTIONS")) {
ParseCommonFlagsFromString(cf, env);
ParseFlagsFromString(f, env);
VReport(1, "Parsed ASAN_OPTIONS: %s\n", env);
}
// If ASan starts in deactivated state, stash and clear some flags.
// Otherwise, let activation flags override current settings.
if (flags()->start_deactivated) {
AsanStartDeactivated();
} else {
// Parse flags that may change between startup and activation.
// On Android they come from a system property.
// On other platforms this is no-op.
char buf[100];
GetExtraActivationFlags(buf, sizeof(buf));
ParseCommonFlagsFromString(cf, buf);
ParseFlagsFromString(f, buf);
if (buf[0] != '\0')
VReport(1, "Parsed activation flags: %s\n", buf);
}
if (common_flags()->help) {
PrintFlagDescriptions();
}
// Flag validation:
if (!CAN_SANITIZE_LEAKS && cf->detect_leaks) {
Report("%s: detect_leaks is not supported on this platform.\n",
SanitizerToolName);
cf->detect_leaks = false;
}
// Make "strict_init_order" imply "check_initialization_order".
// TODO(samsonov): Use a single runtime flag for an init-order checker.
if (f->strict_init_order) {
f->check_initialization_order = true;
}
CHECK_LE((uptr)cf->malloc_context_size, kStackTraceMax);
CHECK_LE(f->min_uar_stack_size_log, f->max_uar_stack_size_log);
}
} // namespace __asan
#if !SANITIZER_SUPPORTS_WEAK_HOOKS
extern "C" {
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
const char* __asan_default_options() { return ""; }
} // extern "C"
#endif

3
compiler-rt/lib/asan/asan_flags.h
View File

@ -72,7 +72,8 @@ extern Flags asan_flags_dont_use_directly;
inline Flags *flags() {
return &asan_flags_dont_use_directly;
}
void InitializeFlags(Flags *f, const char *env);
void InitializeFlags(Flags *f);
void ParseFlagsFromString(Flags *f, const char *str);
} // namespace __asan

2
compiler-rt/lib/asan/asan_internal.h
View File

@ -107,8 +107,6 @@ void PlatformTSDDtor(void *tsd);
void AppendToErrorMessageBuffer(const char *buffer);
void ParseExtraActivationFlags();
void *AsanDlSymNext(const char *sym);
// Platform-specific options.

274
compiler-rt/lib/asan/asan_rtl.cc
View File

@ -70,270 +70,6 @@ static void AsanCheckFailed(const char *file, int line, const char *cond,
Die();
}
// -------------------------- Flags ------------------------- {{{1
Flags asan_flags_dont_use_directly; // use via flags().
static const char *MaybeCallAsanDefaultOptions() {
return (&__asan_default_options) ? __asan_default_options() : "";
}
static const char *MaybeUseAsanDefaultOptionsCompileDefinition() {
#ifdef ASAN_DEFAULT_OPTIONS
// Stringize the macro value.
# define ASAN_STRINGIZE(x) #x
# define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options)
return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS);
#else
return "";
#endif
}
static void ParseFlagsFromString(Flags *f, const char *str) {
CommonFlags *cf = common_flags();
ParseCommonFlagsFromString(cf, str);
// Please write meaningful flag descriptions when adding new flags.
ParseFlag(str, &f->quarantine_size, "quarantine_size",
"Size (in bytes) of quarantine used to detect use-after-free "
"errors. Lower value may reduce memory usage but increase the "
"chance of false negatives.");
ParseFlag(str, &f->redzone, "redzone",
"Minimal size (in bytes) of redzones around heap objects. "
"Requirement: redzone >= 16, is a power of two.");
ParseFlag(str, &f->max_redzone, "max_redzone",
"Maximal size (in bytes) of redzones around heap objects.");
CHECK_GE(f->redzone, 16);
CHECK_GE(f->max_redzone, f->redzone);
CHECK_LE(f->max_redzone, 2048);
CHECK(IsPowerOfTwo(f->redzone));
CHECK(IsPowerOfTwo(f->max_redzone));
ParseFlag(str, &f->debug, "debug",
"If set, prints some debugging information and does additional checks.");
ParseFlag(str, &f->report_globals, "report_globals",
"Controls the way to handle globals (0 - don't detect buffer overflow on "
"globals, 1 - detect buffer overflow, 2 - print data about registered "
"globals).");
ParseFlag(str, &f->check_initialization_order,
"check_initialization_order",
"If set, attempts to catch initialization order issues.");
ParseFlag(str, &f->replace_str, "replace_str",
"If set, uses custom wrappers and replacements for libc string functions "
"to find more errors.");
ParseFlag(str, &f->replace_intrin, "replace_intrin",
"If set, uses custom wrappers for memset/memcpy/memmove intinsics.");
ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free",
"Ignore invalid free() calls to work around some bugs. Used on OS X "
"only.");
ParseFlag(str, &f->detect_stack_use_after_return,
"detect_stack_use_after_return",
"Enables stack-use-after-return checking at run-time.");
ParseFlag(str, &f->min_uar_stack_size_log, "min_uar_stack_size_log",
"Minimum fake stack size log.");
ParseFlag(str, &f->max_uar_stack_size_log, "max_uar_stack_size_log",
"Maximum fake stack size log.");
ParseFlag(str, &f->uar_noreserve, "uar_noreserve",
"Use mmap with 'norserve' flag to allocate fake stack.");
ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size",
"ASan allocator flag. max_malloc_fill_size is the maximal amount of "
"bytes that will be filled with malloc_fill_byte on malloc.");
ParseFlag(str, &f->malloc_fill_byte, "malloc_fill_byte",
"Value used to fill the newly allocated memory.");
ParseFlag(str, &f->exitcode, "exitcode",
"Override the program exit status if the tool found an error.");
ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning",
"If set, user may manually mark memory regions as poisoned or "
"unpoisoned.");
ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying",
"Number of seconds to sleep between printing an error report and "
"terminating the program. Useful for debugging purposes (e.g. when one "
"needs to attach gdb).");
ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size",
"Allows the users to work around the bug in Nvidia drivers prior to "
"295.*.");
ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit",
"If set, explicitly unmaps the (huge) shadow at exit.");
ParseFlag(str, &f->abort_on_error, "abort_on_error",
"If set, the tool calls abort() instead of _exit() after printing the "
"error report.");
ParseFlag(str, &f->print_stats, "print_stats",
"Print various statistics after printing an error message or if "
"atexit=1.");
ParseFlag(str, &f->print_legend, "print_legend",
"Print the legend for the shadow bytes.");
ParseFlag(str, &f->atexit, "atexit",
"If set, prints ASan exit stats even after program terminates "
"successfully.");
ParseFlag(str, &f->allow_reexec, "allow_reexec",
"Allow the tool to re-exec the program. This may interfere badly with "
"the debugger.");
ParseFlag(str, &f->print_full_thread_history,
"print_full_thread_history",
"If set, prints thread creation stacks for the threads involved in the "
"report and their ancestors up to the main thread.");
ParseFlag(str, &f->poison_heap, "poison_heap",
"Poison (or not) the heap memory on [de]allocation. Zero value is useful "
"for benchmarking the allocator or instrumentator.");
ParseFlag(str, &f->poison_array_cookie, "poison_array_cookie",
"Poison (or not) the array cookie after operator new[].");
ParseFlag(str, &f->poison_partial, "poison_partial",
"If true, poison partially addressable 8-byte aligned words "
"(default=true). This flag affects heap and global buffers, but not "
"stack buffers.");
ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch",
"Report errors on malloc/delete, new/free, new/delete[], etc.");
ParseFlag(str, &f->new_delete_type_mismatch, "new_delete_type_mismatch",
"Report errors on mismatch betwen size of new and delete.");
ParseFlag(str, &f->strict_memcmp, "strict_memcmp",
"If true, assume that memcmp(p1, p2, n) always reads n bytes before "
"comparing p1 and p2.");
ParseFlag(str, &f->strict_init_order, "strict_init_order",
"If true, assume that dynamic initializers can never access globals from "
"other modules, even if the latter are already initialized.");
ParseFlag(str, &f->start_deactivated, "start_deactivated",
"If true, ASan tweaks a bunch of other flags (quarantine, redzone, heap "
"poisoning) to reduce memory consumption as much as possible, and "
"restores them to original values when the first instrumented module is "
"loaded into the process. This is mainly intended to be used on "
"Android. ");
ParseFlag(str, &f->detect_invalid_pointer_pairs,
"detect_invalid_pointer_pairs",
"If non-zero, try to detect operations like <, <=, >, >= and - on "
"invalid pointer pairs (e.g. when pointers belong to different objects). "
"The bigger the value the harder we try.");
ParseFlag(str, &f->detect_container_overflow,
"detect_container_overflow",
"If true, honor the container overflow annotations. "
"See https://code.google.com/p/address-sanitizer/wiki/ContainerOverflow");
ParseFlag(str, &f->detect_odr_violation, "detect_odr_violation",
"If >=2, detect violation of One-Definition-Rule (ODR); "
"If ==1, detect ODR-violation only if the two variables "
"have different sizes");
ParseFlag(str, &f->dump_instruction_bytes, "dump_instruction_bytes",
"If true, dump 16 bytes starting at the instruction that caused SEGV");
}
void InitializeFlags(Flags *f, const char *env) {
CommonFlags *cf = common_flags();
SetCommonFlagsDefaults(cf);
cf->detect_leaks = CAN_SANITIZE_LEAKS;
cf->external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
cf->malloc_context_size = kDefaultMallocContextSize;
cf->intercept_tls_get_addr = true;
cf->coverage = false;
internal_memset(f, 0, sizeof(*f));
f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28;
f->redzone = 16;
f->max_redzone = 2048;
f->debug = false;
f->report_globals = 1;
f->check_initialization_order = false;
f->replace_str = true;
f->replace_intrin = true;
f->mac_ignore_invalid_free = false;
f->detect_stack_use_after_return = false; // Also needs the compiler flag.
f->min_uar_stack_size_log = 16; // We can't do smaller anyway.
f->max_uar_stack_size_log = 20; // 1Mb per size class, i.e. ~11Mb per thread.
f->uar_noreserve = false;
f->max_malloc_fill_size = 0x1000; // By default, fill only the first 4K.
f->malloc_fill_byte = 0xbe;
f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE;
f->allow_user_poisoning = true;
f->sleep_before_dying = 0;
f->check_malloc_usable_size = true;
f->unmap_shadow_on_exit = false;
f->abort_on_error = false;
f->print_stats = false;
f->print_legend = true;
f->atexit = false;
f->allow_reexec = true;
f->print_full_thread_history = true;
f->poison_heap = true;
f->poison_array_cookie = true;
f->poison_partial = true;
// Turn off alloc/dealloc mismatch checker on Mac and Windows for now.
// https://code.google.com/p/address-sanitizer/issues/detail?id=131
// https://code.google.com/p/address-sanitizer/issues/detail?id=309
// TODO(glider,timurrrr): Fix known issues and enable this back.
f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0) && (SANITIZER_WINDOWS == 0);
f->new_delete_type_mismatch = true;
f->strict_memcmp = true;
f->strict_init_order = false;
f->start_deactivated = false;
f->detect_invalid_pointer_pairs = 0;
f->detect_container_overflow = true;
f->detect_odr_violation = 2;
f->dump_instruction_bytes = false;
// Override from compile definition.
ParseFlagsFromString(f, MaybeUseAsanDefaultOptionsCompileDefinition());
// Override from user-specified string.
ParseFlagsFromString(f, MaybeCallAsanDefaultOptions());
VReport(1, "Using the defaults from __asan_default_options: %s\n",
MaybeCallAsanDefaultOptions());
// Override from command line.
ParseFlagsFromString(f, env);
if (env)
VReport(1, "Parsed ASAN_OPTIONS: %s\n", env);
// If ASan starts in deactivated state, stash and clear some flags.
// Otherwise, let activation flags override current settings.
if (flags()->start_deactivated)
AsanStartDeactivated();
else
ParseExtraActivationFlags();
if (common_flags()->help) {
PrintFlagDescriptions();
}
// Flag validation:
if (!CAN_SANITIZE_LEAKS && cf->detect_leaks) {
Report("%s: detect_leaks is not supported on this platform.\n",
SanitizerToolName);
cf->detect_leaks = false;
}
// Make "strict_init_order" imply "check_initialization_order".
// TODO(samsonov): Use a single runtime flag for an init-order checker.
if (f->strict_init_order) {
f->check_initialization_order = true;
}
CHECK_LE((uptr)cf->malloc_context_size, kStackTraceMax);
CHECK_LE(f->min_uar_stack_size_log, f->max_uar_stack_size_log);
}
// Parse flags that may change between startup and activation.
// On Android they come from a system property.
// On other platforms this is no-op.
void ParseExtraActivationFlags() {
char buf[100];
GetExtraActivationFlags(buf, sizeof(buf));
ParseFlagsFromString(flags(), buf);
if (buf[0] != '\0')
VReport(1, "Extra activation flags: %s\n", buf);
}
// -------------------------- Globals --------------------- {{{1
int asan_inited;
bool asan_init_is_running;
@ -567,8 +303,7 @@ static void AsanInitInternal() {
// Initialize flags. This must be done early, because most of the
// initialization steps look at flags().
const char *options = GetEnv("ASAN_OPTIONS");
InitializeFlags(flags(), options);
InitializeFlags(flags());
SetCanPoisonMemory(flags()->poison_heap);
SetMallocContextSize(common_flags()->malloc_context_size);
@ -727,13 +462,6 @@ static AsanInitializer asan_initializer;
// ---------------------- Interface ---------------- {{{1
using namespace __asan; // NOLINT
#if !SANITIZER_SUPPORTS_WEAK_HOOKS
extern "C" {
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
const char* __asan_default_options() { return ""; }
} // extern "C"
#endif
int NOINLINE __asan_set_error_exit_code(int exit_code) {
int old = flags()->exitcode;
flags()->exitcode = exit_code;