[asan] Move memcpy, memmove, memset code out of asan_interceptors.cc

This is a pure refactoring change. It simply moves all the code and
macros related to defining the ASan interceptor versions of memcpy,
memmove, and memset into a separate file. This makes it cleaner to
disable all the other interceptor code while still using these three,
for a port that defines these but not the other common interceptors.

Reviewers: alekseyshl

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D35590

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308575 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 131 deletions

diff --git a/lib/asan/asan_interceptors.cc b/lib/asan/asan_interceptors.cc
index 34ca22b86..999c799fe 100644
--- a/lib/asan/asan_interceptors.cc
+++ b/lib/asan/asan_interceptors.cc
@@ -36,108 +36,6 @@
 
 namespace __asan {
 
-// Return true if we can quickly decide that the region is unpoisoned.
-// We assume that a redzone is at least 16 bytes.
-static inline bool QuickCheckForUnpoisonedRegion(uptr beg, uptr size) {
-  if (size == 0) return true;
-  if (size <= 32)
-    return !AddressIsPoisoned(beg) &&
-           !AddressIsPoisoned(beg + size - 1) &&
-           !AddressIsPoisoned(beg + size / 2);
-  if (size <= 64)
-    return !AddressIsPoisoned(beg) &&
-           !AddressIsPoisoned(beg + size / 4) &&
-           !AddressIsPoisoned(beg + size - 1) &&
-           !AddressIsPoisoned(beg + 3 * size / 4) &&
-           !AddressIsPoisoned(beg + size / 2);
-  return false;
-}
-
-struct AsanInterceptorContext {
-  const char *interceptor_name;
-};
-
-// We implement ACCESS_MEMORY_RANGE, ASAN_READ_RANGE,
-// and ASAN_WRITE_RANGE as macro instead of function so
-// that no extra frames are created, and stack trace contains
-// relevant information only.
-// We check all shadow bytes.
-#define ACCESS_MEMORY_RANGE(ctx, offset, size, isWrite) do {            \
-    uptr __offset = (uptr)(offset);                                     \
-    uptr __size = (uptr)(size);                                         \
-    uptr __bad = 0;                                                     \
-    if (__offset > __offset + __size) {                                 \
-      GET_STACK_TRACE_FATAL_HERE;                                       \
-      ReportStringFunctionSizeOverflow(__offset, __size, &stack);       \
-    }                                                                   \
-    if (!QuickCheckForUnpoisonedRegion(__offset, __size) &&             \
-        (__bad = __asan_region_is_poisoned(__offset, __size))) {        \
-      AsanInterceptorContext *_ctx = (AsanInterceptorContext *)ctx;     \
-      bool suppressed = false;                                          \
-      if (_ctx) {                                                       \
-        suppressed = IsInterceptorSuppressed(_ctx->interceptor_name);   \
-        if (!suppressed && HaveStackTraceBasedSuppressions()) {         \
-          GET_STACK_TRACE_FATAL_HERE;                                   \
-          suppressed = IsStackTraceSuppressed(&stack);                  \
-        }                                                               \
-      }                                                                 \
-      if (!suppressed) {                                                \
-        GET_CURRENT_PC_BP_SP;                                           \
-        ReportGenericError(pc, bp, sp, __bad, isWrite, __size, 0, false);\
-      }                                                                 \
-    }                                                                   \
-  } while (0)
-
-// memcpy is called during __asan_init() from the internals of printf(...).
-// We do not treat memcpy with to==from as a bug.
-// See http://llvm.org/bugs/show_bug.cgi?id=11763.
-#define ASAN_MEMCPY_IMPL(ctx, to, from, size)                           \
-  do {                                                                  \
-    if (UNLIKELY(!asan_inited)) return internal_memcpy(to, from, size); \
-    if (asan_init_is_running) {                                         \
-      return REAL(memcpy)(to, from, size);                              \
-    }                                                                   \
-    ENSURE_ASAN_INITED();                                               \
-    if (flags()->replace_intrin) {                                      \
-      if (to != from) {                                                 \
-        CHECK_RANGES_OVERLAP("memcpy", to, size, from, size);           \
-      }                                                                 \
-      ASAN_READ_RANGE(ctx, from, size);                                 \
-      ASAN_WRITE_RANGE(ctx, to, size);                                  \
-    }                                                                   \
-    return REAL(memcpy)(to, from, size);                                \
-  } while (0)
-
-// memset is called inside Printf.
-#define ASAN_MEMSET_IMPL(ctx, block, c, size)                           \
-  do {                                                                  \
-    if (UNLIKELY(!asan_inited)) return internal_memset(block, c, size); \
-    if (asan_init_is_running) {                                         \
-      return REAL(memset)(block, c, size);                              \
-    }                                                                   \
-    ENSURE_ASAN_INITED();                                               \
-    if (flags()->replace_intrin) {                                      \
-      ASAN_WRITE_RANGE(ctx, block, size);                               \
-    }                                                                   \
-    return REAL(memset)(block, c, size);                                \
-  } while (0)
-
-#define ASAN_MEMMOVE_IMPL(ctx, to, from, size)                           \
-  do {                                                                   \
-    if (UNLIKELY(!asan_inited)) return internal_memmove(to, from, size); \
-    ENSURE_ASAN_INITED();                                                \
-    if (flags()->replace_intrin) {                                       \
-      ASAN_READ_RANGE(ctx, from, size);                                  \
-      ASAN_WRITE_RANGE(ctx, to, size);                                   \
-    }                                                                    \
-    return internal_memmove(to, from, size);                             \
-  } while (0)
-
-#define ASAN_READ_RANGE(ctx, offset, size) \
-  ACCESS_MEMORY_RANGE(ctx, offset, size, false)
-#define ASAN_WRITE_RANGE(ctx, offset, size) \
-  ACCESS_MEMORY_RANGE(ctx, offset, size, true)
-
 #define ASAN_READ_STRING_OF_LEN(ctx, s, len, n)                 \
   ASAN_READ_RANGE((ctx), (s),                                   \
     common_flags()->strict_string_checks ? (len) + 1 : (n))
@@ -145,23 +43,6 @@ struct AsanInterceptorContext {
 #define ASAN_READ_STRING(ctx, s, n)                             \
   ASAN_READ_STRING_OF_LEN((ctx), (s), REAL(strlen)(s), (n))
 
-// Behavior of functions like "memcpy" or "strcpy" is undefined
-// if memory intervals overlap. We report error in this case.
-// Macro is used to avoid creation of new frames.
-static inline bool RangesOverlap(const char *offset1, uptr length1,
-                                 const char *offset2, uptr length2) {
-  return !((offset1 + length1 <= offset2) || (offset2 + length2 <= offset1));
-}
-#define CHECK_RANGES_OVERLAP(name, _offset1, length1, _offset2, length2) do { \
-  const char *offset1 = (const char*)_offset1; \
-  const char *offset2 = (const char*)_offset2; \
-  if (RangesOverlap(offset1, length1, offset2, length2)) { \
-    GET_STACK_TRACE_FATAL_HERE; \
-    ReportStringFunctionMemoryRangesOverlap(name, offset1, length1, \
-                                            offset2, length2, &stack); \
-  } \
-} while (0)
-
 static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) {
 #if SANITIZER_INTERCEPT_STRNLEN
   if (REAL(strnlen)) {
@@ -462,18 +343,6 @@ INTERCEPTOR(void, __cxa_throw, void *a, void *b, void *c) {
 }
 #endif
 
-void *__asan_memcpy(void *to, const void *from, uptr size) {
-  ASAN_MEMCPY_IMPL(nullptr, to, from, size);
-}
-
-void *__asan_memset(void *block, int c, uptr size) {
-  ASAN_MEMSET_IMPL(nullptr, block, c, size);
-}
-
-void *__asan_memmove(void *to, const void *from, uptr size) {
-  ASAN_MEMMOVE_IMPL(nullptr, to, from, size);
-}
-
 #if ASAN_INTERCEPT_INDEX
 # if ASAN_USE_ALIAS_ATTRIBUTE_FOR_INDEX
 INTERCEPTOR(char*, index, const char *string, int c)