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//===-- sanitizer/asan_interface.h ------------------------------*- C++ -*-===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer.
//
// Public interface header.
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_ASAN_INTERFACE_H
#define SANITIZER_ASAN_INTERFACE_H
#include <sanitizer/common_interface_defs.h>
#ifdef __cplusplus
extern "C" {
#endif
// Marks memory region [addr, addr+size) as unaddressable.
// This memory must be previously allocated by the user program. Accessing
// addresses in this region from instrumented code is forbidden until
// this region is unpoisoned. This function is not guaranteed to poison
// the whole region - it may poison only subregion of [addr, addr+size) due
// to ASan alignment restrictions.
// Method is NOT thread-safe in the sense that no two threads can
// (un)poison memory in the same memory region simultaneously.
void __asan_poison_memory_region(void const volatile *addr, size_t size);
// Marks memory region [addr, addr+size) as addressable.
// This memory must be previously allocated by the user program. Accessing
// addresses in this region is allowed until this region is poisoned again.
// This function may unpoison a superregion of [addr, addr+size) due to
// ASan alignment restrictions.
// Method is NOT thread-safe in the sense that no two threads can
// (un)poison memory in the same memory region simultaneously.
void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
// User code should use macros instead of functions.
#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
#define ASAN_POISON_MEMORY_REGION(addr, size) \
__asan_poison_memory_region((addr), (size))
#define ASAN_UNPOISON_MEMORY_REGION(addr, size) \
__asan_unpoison_memory_region((addr), (size))
#else
#define ASAN_POISON_MEMORY_REGION(addr, size) \
((void)(addr), (void)(size))
#define ASAN_UNPOISON_MEMORY_REGION(addr, size) \
((void)(addr), (void)(size))
#endif
// Returns 1 if addr is poisoned (i.e. 1-byte read/write access to this
// address will result in error report from AddressSanitizer).
// Otherwise returns 0.
int __asan_address_is_poisoned(void const volatile *addr);
// If at least one byte in [beg, beg+size) is poisoned, return the address
// of the first such byte. Otherwise return 0.
void *__asan_region_is_poisoned(void *beg, size_t size);
// Print the description of addr (useful when debugging in gdb).
void __asan_describe_address(void *addr);
// Useful for calling from a debugger to get information about an ASan error.
// Returns 1 if an error has been (or is being) reported, otherwise returns 0.
int __asan_report_present();
// Useful for calling from a debugger to get information about an ASan error.
// If an error has been (or is being) reported, the following functions return
// the pc, bp, sp, address, access type (0 = read, 1 = write), access size and
// bug description (e.g. "heap-use-after-free"). Otherwise they return 0.
void *__asan_get_report_pc();
void *__asan_get_report_bp();
void *__asan_get_report_sp();
void *__asan_get_report_address();
int __asan_get_report_access_type();
size_t __asan_get_report_access_size();
const char *__asan_get_report_description();
// Useful for calling from the debugger to get information about a pointer.
// Returns the category of the given pointer as a constant string.
// Possible return values are "global", "stack", "stack-fake", "heap",
// "heap-invalid", "shadow-low", "shadow-gap", "shadow-high", "unknown".
// If global or stack, tries to also return the variable name, address and
// size. If heap, tries to return the chunk address and size. 'name' should
// point to an allocated buffer of size 'name_size'.
const char *__asan_locate_address(void *addr, char *name, size_t name_size,
void **region_address, size_t *region_size);
// Useful for calling from the debugger to get the allocation stack trace
// and thread ID for a heap address. Stores up to 'size' frames into 'trace',
// returns the number of stored frames or 0 on error.
size_t __asan_get_alloc_stack(void *addr, void **trace, size_t size,
int *thread_id);
// Useful for calling from the debugger to get the free stack trace
// and thread ID for a heap address. Stores up to 'size' frames into 'trace',
// returns the number of stored frames or 0 on error.
size_t __asan_get_free_stack(void *addr, void **trace, size_t size,
int *thread_id);
// Useful for calling from the debugger to get the current shadow memory
// mapping.
void __asan_get_shadow_mapping(size_t *shadow_scale, size_t *shadow_offset);
// This is an internal function that is called to report an error.
// However it is still a part of the interface because users may want to
// set a breakpoint on this function in a debugger.
void __asan_report_error(void *pc, void *bp, void *sp,
void *addr, int is_write, size_t access_size);
// Deprecated. Call __sanitizer_set_death_callback instead.
void __asan_set_death_callback(void (*callback)(void));
void __asan_set_error_report_callback(void (*callback)(const char*));
// User may provide function that would be called right when ASan detects
// an error. This can be used to notice cases when ASan detects an error, but
// the program crashes before ASan report is printed.
void __asan_on_error();
// Prints accumulated stats to stderr. Used for debugging.
void __asan_print_accumulated_stats();
// This function may be optionally provided by user and should return
// a string containing ASan runtime options. See asan_flags.h for details.
const char* __asan_default_options();
// The following 2 functions facilitate garbage collection in presence of
// asan's fake stack.
// Returns an opaque handler to be used later in __asan_addr_is_in_fake_stack.
// Returns NULL if the current thread does not have a fake stack.
void *__asan_get_current_fake_stack();
// If fake_stack is non-NULL and addr belongs to a fake frame in
// fake_stack, returns the address on real stack that corresponds to
// the fake frame and sets beg/end to the boundaries of this fake frame.
// Otherwise returns NULL and does not touch beg/end.
// If beg/end are NULL, they are not touched.
// This function may be called from a thread other than the owner of
// fake_stack, but the owner thread need to be alive.
void *__asan_addr_is_in_fake_stack(void *fake_stack, void *addr, void **beg,
void **end);
// Performs cleanup before a [[noreturn]] function. Must be called
// before things like _exit and execl to avoid false positives on stack.
void __asan_handle_no_return(void);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // SANITIZER_ASAN_INTERFACE_H
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