Add new interceptor for mi_vector_hash(3)

[krytarowski]

Summary

mi_vector_hash(3) provides fast 32bit hash functions.

Add a test for this interface.

Enable the API for NetBSD.

Based on original work by Yang Zheng.

[vitalybuka]

LGTM

lib/sanitizer_common/sanitizer_common_interceptors.inc

 #define INIT_NETENT \
   COMMON_INTERCEPT_FUNCTION(getnetent); \
   COMMON_INTERCEPT_FUNCTION(getnetbyname); \
   COMMON_INTERCEPT_FUNCTION(getnetbyaddr)
 #else
 #define INIT_NETENT
 #endif
 
+#if SANITIZER_INTERCEPT_MI_VECTOR_HASH
+INTERCEPTOR(void, mi_vector_hash, const void *key, SIZE_T len, u32 seed,
+            u32 hashes[3]) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, mi_vector_hash, key, len, seed, hashes);
+  if (key)
+    COMMON_INTERCEPTOR_READ_RANGE(ctx, key, len);
+  REAL(mi_vector_hash)(key, len, seed, hashes);
+  if (hashes)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, hashes, sizeof(hashes[0]) * 3);
+}
+#define INIT_MI_VECTOR_HASH COMMON_INTERCEPT_FUNCTION(mi_vector_hash)
+#else
+#define INIT_MI_VECTOR_HASH
+#endif
+
 static void InitializeCommonInterceptors() {
   static u64 metadata_mem[sizeof(MetadataHashMap) / sizeof(u64) + 1];
   interceptor_metadata_map = new((void *)&metadata_mem) MetadataHashMap();
 
   INIT_MMAP;
   INIT_MMAP64;
   INIT_TEXTDOMAIN;
   INIT_STRLEN;
static void InitializeCommonInterceptors() {
   INIT_STRLCPY;
   INIT_DEVNAME;
   INIT_DEVNAME_R;
   INIT_FGETLN;
   INIT_STRMODE;
   INIT_TTYENT;
   INIT_PROTOENT;
   INIT_NETENT;
+  INIT_MI_VECTOR_HASH;
 
   INIT___PRINTF_CHK;
 }

lib/sanitizer_common/sanitizer_platform_interceptors.h

 
 #define SANITIZER_INTERCEPT_DEVNAME (SI_NETBSD || SI_OPENBSD || SI_FREEBSD)
 #define SANITIZER_INTERCEPT_DEVNAME_R (SI_NETBSD || SI_FREEBSD)
 #define SANITIZER_INTERCEPT_FGETLN (SI_NETBSD || SI_FREEBSD)
 #define SANITIZER_INTERCEPT_STRMODE (SI_NETBSD || SI_FREEBSD)
 #define SANITIZER_INTERCEPT_TTYENT SI_NETBSD
 #define SANITIZER_INTERCEPT_PROTOENT SI_NETBSD
 #define SANITIZER_INTERCEPT_NETENT SI_NETBSD
+#define SANITIZER_INTERCEPT_MI_VECTOR_HASH SI_NETBSD
 
 #endif  // #ifndef SANITIZER_PLATFORM_INTERCEPTORS_H

test/sanitizer_common/TestCases/NetBSD/mi_vector_hash.cc

+// RUN: %clangxx -O0 -g %s -o %t && %run %t 2>&1 | FileCheck %s
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(void) {
+  unsigned char key[] = {0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99};
+  uint32_t hashes[3];
+  mi_vector_hash(key, __arraycount(key), 0, hashes);
+  for (size_t i = 0; i < __arraycount(hashes); i++)
+    printf("hashes[%zu]='%" PRIx32 "'\n", i, hashes[i]);
+
+  // CHECK: hashes[0]='{{.*}}'
+  // CHECK: hashes[1]='{{.*}}'
+  // CHECK: hashes[2]='{{.*}}'
+
+  return 0;
+}