deps: update V8 to 12.4

common.gypi

@@ -286,7 +286,10 @@
       'VCCLCompilerTool': {
         'AdditionalOptions': [
           '/Zc:__cplusplus',
-          '-std:c++17'
+          # The following option enables c++20 on Windows. This is needed for V8 v12.4+
+          '-std:c++20',
+          # The following option reduces the "error C1060: compiler is out of heap space"
+          '/Zm2000',
         ],
         'BufferSecurityCheck': 'true',
         'DebugInformationFormat': 1,          # /Z7 embed info in .obj files

deps/v8/.clang-format

@@ -3,7 +3,13 @@
 BasedOnStyle: Google
 DerivePointerAlignment: false
 MaxEmptyLinesToKeep: 1
-IfMacros: ['IF', 'IF_NOT', 'ELSE', 'ELSE_IF']
+IfMacros:
+  - IF
+  - IF_NOT
+Macros:
+  # Make clang-format think TurboShaft `ELSE` expands to just `else`, so that
+  # it formats well alongside `if`
+  - ELSE=else
 StatementMacros:
   - DECL_CAST
   - DECL_VERIFIER

deps/v8/.gitignore

@@ -134,3 +134,6 @@ bazel-v8
 !/third_party/abseil-cpp
 /third_party/abseil-cpp/.github
 /third_party/abseil-cpp/ci
+!/third_party/fp16
+/third_party/fp16/src/*
+!/third_party/fp16/src/include

deps/v8/AUTHORS

@@ -81,6 +81,7 @@ Benjamin Tan <demoneaux@gmail.com>
 Bert Belder <bertbelder@gmail.com>
 Brendon Tiszka <btiszka@gmail.com>
 Brice Dobry <brice.dobry@futurewei.com>
+Bruno Pitrus <brunopitrus@hotmail.com>
 Burcu Dogan <burcujdogan@gmail.com>
 Caitlin Potter <caitpotter88@gmail.com>
 Chao Wang <chao.w@rioslab.org>
@@ -109,6 +110,7 @@ Deepak Mohan <hop2deep@gmail.com>
 Deon Dior <diaoyuanjie@gmail.com>
 Derek Tu <derek.t@rioslab.org>
 Divy Srivastava <dj.srivastava23@gmail.com>
+Dmitry Bezhetskov <dima00782@gmail.com>
 Dominic Chen <d.c.ddcc@gmail.com>
 Dominic Farolini <domfarolino@gmail.com>
 Douglas Crosher <dtc-v8@scieneer.com>
@@ -232,6 +234,7 @@ Peter Varga <pvarga@inf.u-szeged.hu>
 Peter Wong <peter.wm.wong@gmail.com>
 PhistucK <phistuck@gmail.com>
 Pierrick Bouvier <pierrick.bouvier@linaro.org>
+Punith B Nayak <npunith125@gmail.com>
 Rafal Krypa <rafal@krypa.net>
 Raul Tambre <raul@tambre.ee>
 Ray Glover <ray@rayglover.net>

deps/v8/BUILD.bazel

@@ -674,6 +674,7 @@ filegroup(
     name = "v8_flags",
     srcs = [
         "src/flags/flag-definitions.h",
+        "src/flags/flags-impl.h",
         "src/flags/flags.h",
     ] + select({
         "is_v8_enable_webassembly": ["src/wasm/wasm-feature-flags.h"],
@@ -802,7 +803,6 @@ filegroup(
         "src/base/timezone-cache.h",
         "src/base/utils/random-number-generator.cc",
         "src/base/utils/random-number-generator.h",
-        "src/base/v8-fallthrough.h",
         "src/base/vector.h",
         "src/base/virtual-address-space.cc",
         "src/base/virtual-address-space.h",
@@ -1540,6 +1540,7 @@ filegroup(
         "src/extensions/trigger-failure-extension.cc",
         "src/extensions/trigger-failure-extension.h",
         "src/flags/flag-definitions.h",
+        "src/flags/flags-impl.h",
         "src/flags/flags.cc",
         "src/flags/flags.h",
         "src/handles/global-handles.cc",
@@ -1569,8 +1570,8 @@ filegroup(
         "src/heap/base-space.h",
         "src/heap/base/active-system-pages.cc",
         "src/heap/base/active-system-pages.h",
-        "src/heap/basic-memory-chunk.cc",
-        "src/heap/basic-memory-chunk.h",
+        "src/heap/memory-chunk-metadata.cc",
+        "src/heap/memory-chunk-metadata.h",
         "src/heap/code-range.cc",
         "src/heap/code-range.h",
         "src/heap/trusted-range.cc",
@@ -1687,11 +1688,11 @@ filegroup(
         "src/heap/memory-allocator.h",
         "src/heap/memory-balancer.cc",
         "src/heap/memory-balancer.h",
+        "src/heap/mutable-page.cc",
+        "src/heap/mutable-page.h",
         "src/heap/memory-chunk.cc",
         "src/heap/memory-chunk.h",
-        "src/heap/memory-chunk-header.cc",
-        "src/heap/memory-chunk-header.h",
-        "src/heap/memory-chunk-inl.h",
+        "src/heap/mutable-page-inl.h",
         "src/heap/memory-chunk-layout.cc",
         "src/heap/memory-chunk-layout.h",
         "src/heap/memory-measurement.cc",
@@ -2805,6 +2806,8 @@ filegroup(
             "src/wasm/function-body-decoder-impl.h",
             "src/wasm/function-compiler.cc",
             "src/wasm/function-compiler.h",
+            "src/wasm/fuzzing/random-module-generation.cc",
+            "src/wasm/fuzzing/random-module-generation.h",
             "src/wasm/graph-builder-interface.cc",
             "src/wasm/graph-builder-interface.h",
             "src/wasm/inlining-tree.h",
@@ -3144,6 +3147,7 @@ filegroup(
         "src/compiler/phase.h",
         "src/compiler/pipeline.cc",
         "src/compiler/pipeline.h",
+        "src/compiler/pipeline-data-inl.h",
         "src/compiler/pipeline-statistics.cc",
         "src/compiler/pipeline-statistics.h",
         "src/compiler/processed-feedback.h",
@@ -3213,6 +3217,7 @@ filegroup(
         "src/compiler/turboshaft/graph-builder.h",
         "src/compiler/turboshaft/graph-visualizer.cc",
         "src/compiler/turboshaft/graph-visualizer.h",
+        "src/compiler/turboshaft/js-generic-lowering-reducer.h",
         "src/compiler/turboshaft/index.h",
         "src/compiler/turboshaft/instruction-selection-phase.cc",
         "src/compiler/turboshaft/instruction-selection-phase.h",
@@ -3234,6 +3239,7 @@ filegroup(
         "src/compiler/turboshaft/machine-lowering-phase.cc",
         "src/compiler/turboshaft/machine-lowering-phase.h",
         "src/compiler/turboshaft/machine-lowering-reducer-inl.h",
+        "src/compiler/turboshaft/maglev-early-lowering-reducer-inl.h",
         "src/compiler/turboshaft/maglev-graph-building-phase.cc",
         "src/compiler/turboshaft/maglev-graph-building-phase.h",
         "src/compiler/turboshaft/machine-optimization-reducer.h",
@@ -3479,6 +3485,7 @@ filegroup(
         "src/builtins/setup-builtins-internal.cc",
         "src/builtins/torque-csa-header-includes.h",
         "src/codegen/code-stub-assembler.cc",
+        "third_party/v8/codegen/fp16-inl.h",
         "src/codegen/code-stub-assembler-inl.h",
         "src/codegen/code-stub-assembler.h",
         "src/heap/setup-heap-internal.cc",
@@ -3678,6 +3685,18 @@ filegroup(
     }),
 )
 
+v8_library(
+  name = "lib_fp16",
+  srcs = ["third_party/fp16/src/include/fp16.h"],
+  hdrs = [
+    "third_party/fp16/src/include/fp16/fp16.h",
+    "third_party/fp16/src/include/fp16/bitcasts.h",
+  ],
+  includes = [
+    "third_party/fp16/src/include",
+  ],
+)
+
 filegroup(
     name = "v8_bigint",
     srcs = [
@@ -4167,6 +4186,7 @@ v8_library(
         ":noicu/generated_torque_definitions",
     ],
     deps = [
+        ":lib_fp16",
         ":v8_libbase",
         "//external:base_trace_event_common",
         "//external:absl_btree",
@@ -4223,11 +4243,11 @@ alias(
 
 v8_library(
     name = "v8_vtune",
-    srcs = glob([
+    srcs = [
         "src/third_party/vtune/v8-vtune.h",
         "src/third_party/vtune/vtune-jit.cc",
         "src/third_party/vtune/vtune-jit.h",
-    ]),
+    ],
     copts = ["-I"],
     deps = [
         ":core_lib_noicu",