build: fix pointer compression builds

- Remove usage of deprecated V8::InitializeSandbox().
- External code space and pointer compression shared cage must
  be enabled when pointer compression builds are enabled.
- We cannot enable the sandbox because that requires allocating
  the array buffer backing stores in the sandbox - we currently
  have many backing stores tied to pointers from C++ land that
  are not even necessarily dynamic (e.g. in static storage).
  Until we manage to get rid of all those, sandbox cannot be
  enabled. Note that enabling pointer compression without
  enabling sandbox is unsupported by V8, and can be broken
  at any time.

PR-URL: #58171
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Juan José Arboleda <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: joyeecheung

common.gypi

@@ -80,6 +80,7 @@
     # Variables controlling external defines exposed in public headers.
     'v8_enable_map_packing%': 0,
     'v8_enable_pointer_compression_shared_cage%': 0,
+    'v8_enable_external_code_space%': 0,
     'v8_enable_sandbox%': 0,
     'v8_enable_v8_checks%': 0,
     'v8_enable_zone_compression%': 0,
@@ -113,6 +114,7 @@
       ['target_arch in "arm ia32 mips mipsel"', {
         'v8_enable_pointer_compression': 0,
         'v8_enable_31bit_smis_on_64bit_arch': 0,
+        'v8_enable_external_code_space': 0,
         'v8_enable_sandbox': 0
       }],
       ['target_arch in "ppc64 s390x"', {
@@ -456,6 +458,9 @@
       ['v8_enable_sandbox == 1', {
         'defines': ['V8_ENABLE_SANDBOX',],
       }],
+      ['v8_enable_external_code_space == 1', {
+        'defines': ['V8_EXTERNAL_CODE_SPACE',],
+      }],
       ['v8_deprecation_warnings == 1', {
         'defines': ['V8_DEPRECATION_WARNINGS',],
       }],

configure.py

@@ -1718,7 +1718,15 @@ def configure_v8(o, configs):
   o['variables']['v8_enable_maglev'] = B(not options.v8_disable_maglev and
                                          o['variables']['target_arch'] in maglev_enabled_architectures)
   o['variables']['v8_enable_pointer_compression'] = 1 if options.enable_pointer_compression else 0
-  o['variables']['v8_enable_sandbox'] = 1 if options.enable_pointer_compression else 0
+  # Using the sandbox requires always allocating array buffer backing stores in the sandbox.
+  # We currently have many backing stores tied to pointers from C++ land that are not
+  # even necessarily dynamic (e.g. in static storage) for fast communication between JS and C++.
+  # Until we manage to get rid of all those, v8_enable_sandbox cannot be used.
+  # Note that enabling pointer compression without enabling sandbox is unsupported by V8,
+  # so this can be broken at any time.
+  o['variables']['v8_enable_sandbox'] = 0
+  o['variables']['v8_enable_pointer_compression_shared_cage'] = 1 if options.enable_pointer_compression else 0
+  o['variables']['v8_enable_external_code_space'] = 1 if options.enable_pointer_compression else 0
   o['variables']['v8_enable_31bit_smis_on_64bit_arch'] = 1 if options.enable_pointer_compression else 0
   o['variables']['v8_enable_extensible_ro_snapshot'] = 0
   o['variables']['v8_trace_maps'] = 1 if options.trace_maps else 0

test/cctest/node_test_fixture.cc

@@ -21,9 +21,6 @@ void NodeTestEnvironment::SetUp() {
   NodeZeroIsolateTestFixture::platform.reset(
       new node::NodePlatform(kV8ThreadPoolSize, tracing_controller));
   v8::V8::InitializePlatform(NodeZeroIsolateTestFixture::platform.get());
-#ifdef V8_ENABLE_SANDBOX
-  ASSERT_TRUE(v8::V8::InitializeSandbox());
-#endif
   cppgc::InitializeProcess(
       NodeZeroIsolateTestFixture::platform->GetPageAllocator());
 

tools/v8_gypfiles/features.gypi

@@ -242,6 +242,11 @@
     # Sets -DV8_ENABLE_SANDBOX.
     'v8_enable_sandbox%': 0,
 
+    # Enable support for external code range relative to the pointer compression
+    # cage.
+    # Sets -DV8_EXTERNAL_CODE_SPACE.
+    'v8_enable_external_code_space%': 0,
+
     # Experimental feature for collecting per-class zone memory stats.
     # Requires use_rtti = true
     'v8_enable_precise_zone_stats%': 0,
@@ -374,6 +379,9 @@
       ['v8_enable_sandbox==1', {
         'defines': ['V8_ENABLE_SANDBOX',],
       }],
+      ['v8_enable_external_code_space==1', {
+        'defines': ['V8_EXTERNAL_CODE_SPACE',],
+      }],
       ['v8_enable_object_print==1', {
         'defines': ['OBJECT_PRINT',],
       }],