deps: update V8 to 6.8.275.24

PR-URL: https://github.com/nodejs/node/pull/21079
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Yang Guo <yangguo@chromium.org>

1 files changed, 25 insertions, 3 deletions

diff --git a/deps/v8/src/base/macros.h b/deps/v8/src/base/macros.h
index db2f194591..3437309bc7 100644
--- a/deps/v8/src/base/macros.h
+++ b/deps/v8/src/base/macros.h
@@ -43,7 +43,6 @@ template <typename T, size_t N>
 char (&ArraySizeHelper(const T (&array)[N]))[N];
 #endif
 
-
 // bit_cast<Dest,Source> is a template function that implements the
 // equivalent of "*reinterpret_cast<Dest*>(&source)".  We need this in
 // very low-level functions like the protobuf library and fast math
@@ -150,20 +149,27 @@ V8_INLINE Dest bit_cast(Source const& source) {
 #define INLINE(declarator)    V8_INLINE declarator
 #define NO_INLINE(declarator) V8_NOINLINE declarator
 
-// Define V8_USE_ADDRESS_SANITIZER macros.
+// Define V8_USE_ADDRESS_SANITIZER macro.
 #if defined(__has_feature)
 #if __has_feature(address_sanitizer)
 #define V8_USE_ADDRESS_SANITIZER 1
 #endif
 #endif
 
-// Define DISABLE_ASAN macros.
+// Define DISABLE_ASAN macro.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #define DISABLE_ASAN __attribute__((no_sanitize_address))
 #else
 #define DISABLE_ASAN
 #endif
 
+// Define V8_USE_MEMORY_SANITIZER macro.
+#if defined(__has_feature)
+#if __has_feature(memory_sanitizer)
+#define V8_USE_MEMORY_SANITIZER 1
+#endif
+#endif
+
 // Helper macro to define no_sanitize attributes only with clang.
 #if defined(__clang__) && defined(__has_attribute)
 #if __has_attribute(no_sanitize)
@@ -271,6 +277,14 @@ struct Use {
 }  // namespace base
 }  // namespace v8
 
+// implicit_cast<A>(x) triggers an implicit cast from {x} to type {A}. This is
+// useful in situations where static_cast<A>(x) would do too much.
+// Only use this for cheap-to-copy types, or use move semantics explicitly.
+template <class A>
+V8_INLINE A implicit_cast(A x) {
+  return x;
+}
+
 // Define our own macros for writing 64-bit constants.  This is less fragile
 // than defining __STDC_CONSTANT_MACROS before including <stdint.h>, and it
 // works on compilers that don't have it (like MSVC).
@@ -296,6 +310,14 @@ struct Use {
 #define V8PRIdPTR V8_PTR_PREFIX "d"
 #define V8PRIuPTR V8_PTR_PREFIX "u"
 
+#ifdef V8_TARGET_ARCH_64_BIT
+#define V8_PTR_HEX_DIGITS 12
+#define V8PRIxPTR_FMT "0x%012" V8PRIxPTR
+#else
+#define V8_PTR_HEX_DIGITS 8
+#define V8PRIxPTR_FMT "0x%08" V8PRIxPTR
+#endif
+
 // ptrdiff_t is 't' according to the standard, but MSVC uses 'I'.
 #if V8_CC_MSVC
 #define V8PRIxPTRDIFF "Ix"