xref: /freebsd-11-stable/contrib/llvm-project/compiler-rt/include/sanitizer/msan_interface.h

//===-- msan_interface.h --------------------------------------------------===//
//
//                     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 MemorySanitizer.
//
// Public interface header.
//===----------------------------------------------------------------------===//
#ifndef MSAN_INTERFACE_H
#define MSAN_INTERFACE_H

#include <sanitizer/common_interface_defs.h>

#ifdef __cplusplus
extern "C" {
#endif
  /* Set raw origin for the memory range. */
  void __msan_set_origin(const volatile void *a, size_t size, uint32_t origin);

  /* Get raw origin for an address. */
  uint32_t __msan_get_origin(const volatile void *a);

  /* Test that this_id is a descendant of prev_id (or they are simply equal).
   * "descendant" here means they are part of the same chain, created with
   * __msan_chain_origin. */
  int __msan_origin_is_descendant_or_same(uint32_t this_id, uint32_t prev_id);

  /* Returns non-zero if tracking origins. */
  int __msan_get_track_origins();

  /* Returns the origin id of the latest UMR in the calling thread. */
  uint32_t __msan_get_umr_origin();

  /* Make memory region fully initialized (without changing its contents). */
  void __msan_unpoison(const volatile void *a, size_t size);

  /* Make a null-terminated string fully initialized (without changing its
     contents). */
  void __msan_unpoison_string(const volatile char *a);

  /* Make memory region fully uninitialized (without changing its contents).
     This is a legacy interface that does not update origin information. Use
     __msan_allocated_memory() instead. */
  void __msan_poison(const volatile void *a, size_t size);

  /* Make memory region partially uninitialized (without changing its contents).
   */
  void __msan_partial_poison(const volatile void *data, void *shadow,
                             size_t size);

  /* Returns the offset of the first (at least partially) poisoned byte in the
     memory range, or -1 if the whole range is good. */
  intptr_t __msan_test_shadow(const volatile void *x, size_t size);

  /* Checks that memory range is fully initialized, and reports an error if it
   * is not. */
  void __msan_check_mem_is_initialized(const volatile void *x, size_t size);

  /* Set exit code when error(s) were detected.
     Value of 0 means don't change the program exit code. */
  void __msan_set_exit_code(int exit_code);

  /* For testing:
     __msan_set_expect_umr(1);
     ... some buggy code ...
     __msan_set_expect_umr(0);
     The last line will verify that a UMR happened. */
  void __msan_set_expect_umr(int expect_umr);

  /* Change the value of keep_going flag. Non-zero value means don't terminate
     program execution when an error is detected. This will not affect error in
     modules that were compiled without the corresponding compiler flag. */
  void __msan_set_keep_going(int keep_going);

  /* Print shadow and origin for the memory range to stderr in a human-readable
     format. */
  void __msan_print_shadow(const volatile void *x, size_t size);

  /* Print shadow for the memory range to stderr in a minimalistic
     human-readable format. */
  void __msan_dump_shadow(const volatile void *x, size_t size);

  /* Returns true if running under a dynamic tool (DynamoRio-based). */
  int  __msan_has_dynamic_component();

  /* Tell MSan about newly allocated memory (ex.: custom allocator).
     Memory will be marked uninitialized, with origin at the call site. */
  void __msan_allocated_memory(const volatile void* data, size_t size);

  /* This function may be optionally provided by user and should return
     a string containing Msan runtime options. See msan_flags.h for details. */
  const char* __msan_default_options();

  /* Sets the callback to be called right before death on error.
     Passing 0 will unset the callback. */
  void __msan_set_death_callback(void (*callback)(void));

#ifdef __cplusplus
}  // extern "C"
#endif

#endif