[v12.x] Backport update to V8 7.8

common.gypi

@@ -38,7 +38,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.16',
+    'v8_embedder_string': '-node.21',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/.gitignore

@@ -52,6 +52,8 @@
 /test/test262/data
 /test/test262/harness
 /test/wasm-js/data
+/test/wasm-js/tests
+/test/wasm-js/tests.tar.gz
 /test/wasm-spec-tests/tests
 /test/wasm-spec-tests/tests.tar.gz
 /third_party/*

deps/v8/.gn

@@ -16,4 +16,5 @@ check_targets = []
 # These are the list of GN files that run exec_script. This whitelist exists
 # to force additional review for new uses of exec_script, which is strongly
 # discouraged except for gypi_to_gn calls.
-exec_script_whitelist = build_dotfile_settings.exec_script_whitelist + []
+exec_script_whitelist = build_dotfile_settings.exec_script_whitelist +
+                        [ "//build_overrides/build.gni" ]

deps/v8/AUTHORS

@@ -39,6 +39,7 @@ Vewd Software AS <*@vewd.com>
 Groupon <*@groupon.com>
 Meteor Development Group <*@meteor.com>
 Cloudflare, Inc. <*@cloudflare.com>
+Julia Computing, Inc. <*@juliacomputing.com>
 
 Aaron Bieber <deftly@gmail.com>
 Abdulla Kamar <abdulla.kamar@gmail.com>
@@ -74,6 +75,7 @@ Colin Ihrig <cjihrig@gmail.com>
 Daniel Andersson <kodandersson@gmail.com>
 Daniel Bevenius <daniel.bevenius@gmail.com>
 Daniel James <dnljms@gmail.com>
+David Carlier <devnexen@gmail.com>
 Deepak Mohan <hop2deep@gmail.com>
 Deon Dior <diaoyuanjie@gmail.com>
 Dominic Farolini <domfarolino@gmail.com>
@@ -163,6 +165,7 @@ Rob Wu <rob@robwu.nl>
 Robert Meijer <robert.s.meijer@gmail.com>
 Robert Mustacchi <rm@fingolfin.org>
 Robert Nagy <robert.nagy@gmail.com>
+Rong Wang <wangrong089@gmail.com>
 Ross Kirsling <rkirsling@gmail.com>
 Ruben Bridgewater <ruben@bridgewater.de>
 Ryan Dahl <ry@tinyclouds.org>

deps/v8/BUILD.gn

@@ -91,7 +91,7 @@ declare_args() {
   # Enable embedded builtins.
   v8_enable_embedded_builtins = true
 
-  # Enable the registration of unwinding info for Windows/x64.
+  # Enable the registration of unwinding info for Windows x64 and ARM64.
   v8_win64_unwinding_info = true
 
   # Enable code comments for builtins in the snapshot (impacts performance).
@@ -187,15 +187,21 @@ declare_args() {
   # Enable sharing read-only space across isolates.
   # Sets -DV8_SHARED_RO_HEAP.
   v8_enable_shared_ro_heap = ""
-}
 
-# We reuse the snapshot toolchain for building torque and other generators to
-# avoid building v8_libbase on the host more than once. On mips with big endian,
-# the snapshot toolchain is the target toolchain and, hence, can't be used.
-v8_generator_toolchain = v8_snapshot_toolchain
-if (host_cpu == "x64" &&
-    (v8_current_cpu == "mips" || v8_current_cpu == "mips64")) {
-  v8_generator_toolchain = "//build/toolchain/linux:clang_x64"
+  # Enable lazy source positions by default.
+  v8_enable_lazy_source_positions = true
+
+  # Disable write barriers when GCs are non-incremental and
+  # heap has single generation.
+  v8_disable_write_barriers = false
+
+  # Redirect allocation in young generation so that there will be
+  # only one single generation.
+  v8_enable_single_generation = ""
+
+  # Use token threaded dispatch for the regular expression interpreter.
+  # Use switch-based dispatch if this is false
+  v8_enable_regexp_interpreter_threaded_dispatch = true
 }
 
 # Derived defaults.
@@ -231,6 +237,13 @@ if (v8_enable_fast_torque == "") {
   v8_enable_fast_torque = v8_enable_fast_mksnapshot
 }
 
+if (v8_enable_single_generation == "") {
+  v8_enable_single_generation = v8_disable_write_barriers
+}
+
+assert(!v8_disable_write_barriers || v8_enable_single_generation,
+       "Disabling write barriers works only with single generation")
+
 assert(v8_current_cpu != "x86" || !v8_untrusted_code_mitigations,
        "Untrusted code mitigations are unsupported on ia32")
 
@@ -424,12 +437,21 @@ config("features") {
       defines += [ "V8_SNAPSHOT_NATIVE_CODE_COUNTERS" ]
     }
   }
+  if (v8_enable_single_generation) {
+    defines += [ "V8_ENABLE_SINGLE_GENERATION" ]
+  }
+  if (v8_disable_write_barriers) {
+    defines += [ "V8_DISABLE_WRITE_BARRIERS" ]
+  }
   if (v8_use_external_startup_data) {
     defines += [ "V8_USE_EXTERNAL_STARTUP_DATA" ]
   }
   if (v8_enable_concurrent_marking) {
     defines += [ "V8_CONCURRENT_MARKING" ]
   }
+  if (v8_enable_lazy_source_positions) {
+    defines += [ "V8_ENABLE_LAZY_SOURCE_POSITIONS" ]
+  }
   if (v8_check_microtasks_scopes_consistency) {
     defines += [ "V8_CHECK_MICROTASKS_SCOPES_CONSISTENCY" ]
   }
@@ -451,6 +473,9 @@ config("features") {
   if (v8_win64_unwinding_info) {
     defines += [ "V8_WIN64_UNWINDING_INFO" ]
   }
+  if (v8_enable_regexp_interpreter_threaded_dispatch) {
+    defines += [ "V8_ENABLE_REGEXP_INTERPRETER_THREADED_DISPATCH" ]
+  }
 }
 
 config("toolchain") {
@@ -968,16 +993,21 @@ torque_files = [