deps: update V8 to 5.4.500.27

Pick up latest commit from the 5.4-lkgr branch.

deps: edit V8 gitignore to allow trace event copy
deps: update V8 trace event to 315bf1e2d45be7d53346c31cfcc37424a32c30c8
deps: edit V8 gitignore to allow gtest_prod.h copy
deps: update V8 gtest to 6f8a66431cb592dad629028a50b3dd418a408c87

PR-URL: https://github.com/nodejs/node/pull/8317
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/deps/v8/src/ostreams.cc b/deps/v8/src/ostreams.cc
index 120db257cd..a0a548b607 100644
--- a/deps/v8/src/ostreams.cc
+++ b/deps/v8/src/ostreams.cc
@@ -61,6 +61,14 @@ std::ostream& PrintUC16(std::ostream& os, uint16_t c, bool (*pred)(uint16_t)) {
   return os << buf;
 }
 
+std::ostream& PrintUC16ForJSON(std::ostream& os, uint16_t c,
+                               bool (*pred)(uint16_t)) {
+  // JSON does not allow \x99; must use \u0099.
+  char buf[10];
+  const char* format = pred(c) ? "%c" : "\\u%04x";
+  snprintf(buf, sizeof(buf), format, c);
+  return os << buf;
+}
 
 std::ostream& PrintUC32(std::ostream& os, int32_t c, bool (*pred)(uint16_t)) {
   if (c <= String::kMaxUtf16CodeUnit) {
@@ -84,7 +92,7 @@ std::ostream& operator<<(std::ostream& os, const AsEscapedUC16ForJSON& c) {
   if (c.value == '\r') return os << "\\r";
   if (c.value == '\t') return os << "\\t";
   if (c.value == '\"') return os << "\\\"";
-  return PrintUC16(os, c.value, IsOK);
+  return PrintUC16ForJSON(os, c.value, IsOK);
 }
 
 
@@ -97,5 +105,11 @@ std::ostream& operator<<(std::ostream& os, const AsUC32& c) {
   return PrintUC32(os, c.value, IsPrint);
 }
 
+std::ostream& operator<<(std::ostream& os, const AsHex& hex) {
+  char buf[20];
+  snprintf(buf, sizeof(buf), "%.*" PRIx64, hex.min_width, hex.value);
+  return os << buf;
+}
+
 }  // namespace internal
 }  // namespace v8