Remove bytecode mode of Dart SDK build

This change cleans up build.py --bytecode and gn.py --bytecode options.

Change-Id: Ie251e7049ce3f8f9da28d35eda139b60ee23af98
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/167842
Reviewed-by: Régis Crelier <regis@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>

runtime/BUILD.gn

@@ -128,10 +128,6 @@ config("dart_config") {
     include_dirs += [ "../third_party/tcmalloc/gperftools/src" ]
   }
 
-  if (dart_platform_bytecode) {
-    defines += [ "DART_USE_BYTECODE" ]
-  }
-
   if (is_fuchsia) {
     if (using_fuchsia_gn_sdk) {
       lib_dirs = [ root_out_dir + "/lib" ]

runtime/runtime_args.gni

@@ -68,9 +68,6 @@ declare_args() {
     dart_component_kind = "static_library"
   }
 
-  # Controls whether the VM uses bytecode.
-  dart_platform_bytecode = false
-
   # Whether the VM includes the kernel service in all modes (debug, release,
   # product).
   exclude_kernel_service = false

runtime/vm/BUILD.gn

@@ -191,9 +191,6 @@ template("gen_vm_platform") {
     if (defined(invoker.exclude_source) && invoker.exclude_source) {
       args += [ "--exclude-source" ]
     }
-    if (defined(invoker.bytecode) && invoker.bytecode) {
-      args += [ "--bytecode" ]
-    }
     outline = "vm_outline" + output_postfix + ".dill"
   }
 }
@@ -218,10 +215,6 @@ gen_vm_platform("vm_platform_stripped") {
   add_implicit_vm_platform_dependency = false
   exclude_source = true
   output_postfix = "_strong_stripped"
-
-  if (dart_platform_bytecode) {
-    bytecode = true
-  }
 }
 
 group("kernel_platform_files") {

runtime/vm/flag_list.h

@@ -20,12 +20,6 @@ constexpr bool kDartPrecompiledRuntime = true;
 constexpr bool kDartPrecompiledRuntime = false;
 #endif
 
-#if defined(DART_USE_BYTECODE)
-constexpr bool kDartUseBytecode = true;
-#else
-constexpr bool kDartUseBytecode = false;
-#endif
-
 #if defined(USING_THREAD_SANITIZER)
 // TODO(39611): Address races in the background compiler.
 constexpr bool kDartUseBackgroundCompilation = false;
@@ -225,7 +219,7 @@ constexpr bool kDartUseBackgroundCompilation = true;
   D(trace_zones, bool, false, "Traces allocation sizes in the zone.")          \
   P(truncating_left_shift, bool, true,                                         \
     "Optimize left shift to truncate if possible")                             \
-  P(use_bytecode_compiler, bool, kDartUseBytecode, "Compile from bytecode")    \
+  P(use_bytecode_compiler, bool, false, "Compile from bytecode")               \
   P(use_compactor, bool, false, "Compact the heap during old-space GC.")       \
   P(use_cha_deopt, bool, true,                                                 \
     "Use class hierarchy analysis even if it can cause deoptimization.")       \

tools/gn.py

@@ -169,8 +169,6 @@ def ToGnArgs(args, mode, arch, target_os, sanitizer, verify_sdk_hash):
     if gn_args['target_os'] in ['linux', 'win']:
         gn_args['dart_use_fallback_root_certificates'] = True
 
-    gn_args['dart_platform_bytecode'] = args.bytecode
-
     # Use tcmalloc only when targeting Linux and when not using ASAN.
     gn_args['dart_use_tcmalloc'] = ((gn_args['target_os'] == 'linux') and
                                     sanitizer == 'none')
@@ -385,17 +383,6 @@ def AddCommonGnOptionArgs(parser):
                         action='store_false')
     parser.set_defaults(verify_sdk_hash=True)
 
-    parser.add_argument('--bytecode',
-                        '-b',
-                        help='Use bytecode in Dart VM',
-                        dest='bytecode',
-                        action="store_true")
-    parser.add_argument('--no-bytecode',
-                        help='Disable bytecode in Dart VM',
-                        dest='bytecode',
-                        action="store_false")
-    parser.set_defaults(bytecode=False)
-
     parser.add_argument('--clang', help='Use Clang', action='store_true')
     parser.add_argument('--no-clang',
                         help='Disable Clang',

utils/application_snapshot.gni

@@ -127,13 +127,6 @@ template("_application_snapshot") {
       # "kernel_snapshot" passes this if needed, we always pass it)
       "-Dsdk_hash=$sdk_hash",
     ]
-    if (dart_platform_bytecode) {
-      args += [
-        "--gen-bytecode",
-        "--drop-ast",
-        "--bytecode-options=source-positions",
-      ]
-    }
     args += [ rebase_path(main_dart) ]
   }
 

utils/kernel-service/BUILD.gn

@@ -26,9 +26,6 @@ kernel_application_snapshot("kernel-service_snapshot") {
     # Without the ', "/"' part, on Linux it would get four slashes.
     "file:///" + rebase_path("../../pkg/compiler/lib/src/dart2js.dart", "/"),
   ]
-  if (dart_platform_bytecode) {
-    training_args += [ "--bytecode" ]
-  }
   output = "$root_gen_dir/kernel-service.dart.snapshot"
 }
 
@@ -113,12 +110,6 @@ template("kernel_service_dill") {
           "--output=" + rebase_path(output),
         ]
     args += [ scheme + ":///pkg/vm/bin/kernel_service.dart" ]
-    if (dart_platform_bytecode) {
-      args += [
-        "--gen-bytecode",
-        "--drop-ast",
-      ]
-    }
   }
 }