[class] Make class field initializers breakable in the debugger

Add tests.

Bug: v8:5367
Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I2a4215a87ba1dae98c4b25547494165f534b4a66
Reviewed-on: https://chromium-review.googlesource.com/1218046
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55974}

src/interpreter/bytecode-generator.cc

@@ -1859,6 +1859,7 @@ void BytecodeGenerator::BuildClassLiteral(ClassLiteral* expr) {
         DCHECK_NE(property->kind(), ClassLiteral::Property::PRIVATE_FIELD);
         Register key = register_allocator()->GrowRegisterList(&args);
 
+        builder()->SetExpressionAsStatementPosition(property->key());
         BuildLoadPropertyKey(property, key);
         if (property->is_static()) {
           // The static prototype property is read only. We handle the non
@@ -1968,13 +1969,13 @@ void BytecodeGenerator::VisitClassLiteral(ClassLiteral* expr) {
 }
 
 void BytecodeGenerator::VisitInitializeClassFieldsStatement(
-    InitializeClassFieldsStatement* expr) {
+    InitializeClassFieldsStatement* stmt) {
   RegisterList args = register_allocator()->NewRegisterList(3);
   Register constructor = args[0], key = args[1], value = args[2];
   builder()->MoveRegister(builder()->Receiver(), constructor);
 
-  for (int i = 0; i < expr->fields()->length(); i++) {
-    ClassLiteral::Property* property = expr->fields()->at(i);
+  for (int i = 0; i < stmt->fields()->length(); i++) {
+    ClassLiteral::Property* property = stmt->fields()->at(i);
 
     if (property->is_computed_name()) {
       DCHECK_EQ(property->kind(), ClassLiteral::Property::PUBLIC_FIELD);
@@ -1993,6 +1994,7 @@ void BytecodeGenerator::VisitInitializeClassFieldsStatement(
       BuildLoadPropertyKey(property, key);
     }
 
+    builder()->SetExpressionAsStatementPosition(property->value());
     VisitForRegisterValue(property->value(), value);
     VisitSetHomeObject(value, constructor, property);
 

src/parsing/parser.cc

@@ -3252,7 +3252,7 @@ FunctionLiteral* Parser::CreateInitializerFunction(
       ast_value_factory()->GetOneByteString(name), scope, statements, 0, 0, 0,
       FunctionLiteral::kNoDuplicateParameters,
       FunctionLiteral::kAnonymousExpression,
-      FunctionLiteral::kShouldEagerCompile, scope->start_position(), true,
+      FunctionLiteral::kShouldEagerCompile, scope->start_position(), false,
       GetNextFunctionLiteralId());
 }
 

src/runtime/runtime-internal.cc

@@ -631,5 +631,14 @@ RUNTIME_FUNCTION(Runtime_ReportMessage) {
   return ReadOnlyRoots(isolate).undefined_value();
 }
 
+RUNTIME_FUNCTION(Runtime_GetInitializerFunction) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(1, args.length());
+
+  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, constructor, 0);
+  Handle<Symbol> key = isolate->factory()->class_fields_symbol();
+  Handle<Object> initializer = JSReceiver::GetDataProperty(constructor, key);
+  return *initializer;
+}
 }  // namespace internal
 }  // namespace v8

src/runtime/runtime.h

@@ -213,51 +213,51 @@ namespace internal {
 #define FOR_EACH_INTRINSIC_INTL(F)
 #endif  // V8_INTL_SUPPORT
 
-#define FOR_EACH_INTRINSIC_INTERNAL(F)                               \
-  F(AllocateInNewSpace, 1, 1)                                        \
-  F(AllocateInTargetSpace, 2, 1)                                     \
-  F(AllocateSeqOneByteString, 1, 1)                                  \
-  F(AllocateSeqTwoByteString, 1, 1)                                  \
-  F(AllowDynamicFunction, 1, 1)                                      \
-  F(CheckIsBootstrapping, 0, 1)                                      \
-  F(CreateAsyncFromSyncIterator, 1, 1)                               \
-  F(CreateListFromArrayLike, 1, 1)                                   \
-  F(CreateTemplateObject, 1, 1)                                      \
-  F(DeserializeLazy, 1, 1)                                           \
-  F(ExportFromRuntime, 1, 1)                                         \
-  F(GetAndResetRuntimeCallStats, -1 /* <= 2 */, 1)                   \
-  F(IncrementUseCounter, 1, 1)                                       \
-  F(InstallToContext, 1, 1)                                          \
-  F(Interrupt, 0, 1)                                                 \
-  F(IS_VAR, 1, 1)                                                    \
-  F(NewReferenceError, 2, 1)                                         \
-  F(NewSyntaxError, 2, 1)                                            \
-  F(NewTypeError, 2, 1)                                              \
-  F(OrdinaryHasInstance, 2, 1)                                       \
-  F(PromoteScheduledException, 0, 1)                                 \
-  F(ReportMessage, 1, 1)                                             \
-  F(ReThrow, 1, 1)                                                   \
-  F(RunMicrotaskCallback, 2, 1)                                      \
-  F(RunMicrotasks, 0, 1)                                             \
-  F(StackGuard, 0, 1)                                                \
-  F(Throw, 1, 1)                                                     \
-  F(ThrowApplyNonFunction, 1, 1)                                     \
-  F(ThrowCalledNonCallable, 1, 1)                                    \
-  F(ThrowConstructedNonConstructable, 1, 1)                          \
-  F(ThrowConstructorReturnedNonObject, 0, 1)                         \
-  F(ThrowInvalidStringLength, 0, 1)                                  \
-  F(ThrowInvalidTypedArrayAlignment, 2, 1)                           \
-  F(ThrowIteratorError, 1, 1)                                        \
-  F(ThrowIteratorResultNotAnObject, 1, 1)                            \
-  F(ThrowNotConstructor, 1, 1)                                       \
-  F(ThrowRangeError, -1 /* >= 1 */, 1)                               \
-  F(ThrowReferenceError, 1, 1)                                       \
-  F(ThrowStackOverflow, 0, 1)                                        \
-  F(ThrowSymbolAsyncIteratorInvalid, 0, 1)                           \
-  F(ThrowSymbolIteratorInvalid, 0, 1)                                \
-  F(ThrowThrowMethodMissing, 0, 1)                                   \
-  F(ThrowTypeError, -1 /* >= 1 */, 1)                                \
-  F(Typeof, 1, 1)                                                    \
+#define FOR_EACH_INTRINSIC_INTERNAL(F)             \
+  F(AllocateInNewSpace, 1, 1)                      \
+  F(AllocateInTargetSpace, 2, 1)                   \
+  F(AllocateSeqOneByteString, 1, 1)                \
+  F(AllocateSeqTwoByteString, 1, 1)                \
+  F(AllowDynamicFunction, 1, 1)                    \
+  F(CheckIsBootstrapping, 0, 1)                    \
+  F(CreateAsyncFromSyncIterator, 1, 1)             \
+  F(CreateListFromArrayLike, 1, 1)                 \
+  F(CreateTemplateObject, 1, 1)                    \
+  F(DeserializeLazy, 1, 1)                         \
+  F(ExportFromRuntime, 1, 1)                       \
+  F(GetAndResetRuntimeCallStats, -1 /* <= 2 */, 1) \
+  F(IncrementUseCounter, 1, 1)                     \
+  F(InstallToContext, 1, 1)                        \
+  F(Interrupt, 0, 1)                               \
+  F(IS_VAR, 1, 1)                                  \
+  F(NewReferenceError, 2, 1)                       \
+  F(NewSyntaxError, 2, 1)                          \
+  F(NewTypeError, 2, 1)                            \
+  F(OrdinaryHasInstance, 2, 1)                     \
+  F(PromoteScheduledException, 0, 1)               \
+  F(ReportMessage, 1, 1)                           \
+  F(ReThrow, 1, 1)                                 \
+  F(RunMicrotaskCallback, 2, 1)                    \
+  F(RunMicrotasks, 0, 1)                           \
+  F(StackGuard, 0, 1)                              \
+  F(Throw, 1, 1)                                   \
+  F(ThrowApplyNonFunction, 1, 1)                   \
+  F(ThrowCalledNonCallable, 1, 1)                  \
+  F(ThrowConstructedNonConstructable, 1, 1)        \
+  F(ThrowConstructorReturnedNonObject, 0, 1)       \
+  F(ThrowInvalidStringLength, 0, 1)                \
+  F(ThrowInvalidTypedArrayAlignment, 2, 1)         \
+  F(ThrowIteratorError, 1, 1)                      \
+  F(ThrowIteratorResultNotAnObject, 1, 1)          \
+  F(ThrowNotConstructor, 1, 1)                     \
+  F(ThrowRangeError, -1 /* >= 1 */, 1)             \
+  F(ThrowReferenceError, 1, 1)                     \
+  F(ThrowStackOverflow, 0, 1)                      \
+  F(ThrowSymbolAsyncIteratorInvalid, 0, 1)         \
+  F(ThrowSymbolIteratorInvalid, 0, 1)              \
+  F(ThrowThrowMethodMissing, 0, 1)                 \
+  F(ThrowTypeError, -1 /* >= 1 */, 1)              \
+  F(Typeof, 1, 1)                                  \
   F(UnwindAndFindExceptionHandler, 0, 1)
 
 #define FOR_EACH_INTRINSIC_LITERALS(F)              \
@@ -471,6 +471,7 @@ namespace internal {
   F(FreezeWasmLazyCompilation, 1, 1)          \
   F(GetCallable, 0, 1)                        \
   F(GetDeoptCount, 1, 1)                      \
+  F(GetInitializerFunction, 1, 1)             \
   F(GetOptimizationStatus, -1, 1)             \
   F(GetUndetectable, 0, 1)                    \
   F(GetWasmExceptionId, 2, 1)                 \

test/cctest/interpreter/bytecode_expectations/ClassDeclarations.golden

@@ -103,12 +103,12 @@ bytecodes: [
                 B(Star), R(3),
                 B(LdaConstant), U8(3),
                 B(Star), R(4),
-                B(LdaImmutableCurrentContextSlot), U8(4),
-  /*   75 E> */ B(ToName), R(7),
+  /*   75 S> */ B(LdaImmutableCurrentContextSlot), U8(4),
+                B(ToName), R(7),
                 B(CreateClosure), U8(5), U8(1), U8(2),
                 B(Star), R(8),
-                B(LdaImmutableCurrentContextSlot), U8(5),
-  /*  106 E> */ B(ToName), R(9),
+  /*  106 S> */ B(LdaImmutableCurrentContextSlot), U8(5),
+                B(ToName), R(9),
                 B(LdaConstant), U8(6),
                 B(TestEqualStrict), R(9), U8(2),
                 B(Mov), R(3), R(5),

test/cctest/interpreter/bytecode_expectations/PublicClassFields.golden

@@ -37,7 +37,7 @@ bytecodes: [
                 B(Star), R(5),
                 B(LdaConstant), U8(1),
                 B(Star), R(6),
-                B(LdaConstant), U8(3),
+  /*   60 S> */ B(LdaConstant), U8(3),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(9),
                 B(Mov), R(5), R(7),
@@ -59,7 +59,7 @@ bytecodes: [
                 B(Star), R(5),
                 B(LdaConstant), U8(7),
                 B(Star), R(6),
-                B(LdaConstant), U8(3),
+  /*   99 S> */ B(LdaConstant), U8(3),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(9),
                 B(Mov), R(5), R(7),
@@ -145,7 +145,7 @@ bytecodes: [
                 B(Star), R(7),
                 B(LdaConstant), U8(1),
                 B(Star), R(8),
-                B(LdaConstant), U8(5),
+  /*   77 S> */ B(LdaConstant), U8(5),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(11),
                 B(Mov), R(7), R(9),
@@ -175,7 +175,7 @@ bytecodes: [
                 B(Star), R(7),
                 B(LdaConstant), U8(9),
                 B(Star), R(8),
-                B(LdaConstant), U8(5),
+  /*  133 S> */ B(LdaConstant), U8(5),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(11),
                 B(CreateClosure), U8(13), U8(7), U8(2),
@@ -198,7 +198,7 @@ bytecodes: [
                 B(Star), R(7),
                 B(LdaConstant), U8(16),
                 B(Star), R(8),
-                B(LdaConstant), U8(5),
+  /*  256 S> */ B(LdaConstant), U8(5),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(11),
                 B(Mov), R(7), R(9),

test/cctest/interpreter/bytecode_expectations/StaticClassFields.golden

@@ -44,10 +44,10 @@ bytecodes: [
                 B(Star), R(5),
                 B(LdaConstant), U8(1),
                 B(Star), R(6),
-                B(LdaConstant), U8(3),
+  /*   60 S> */ B(LdaConstant), U8(3),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(9),
-                B(LdaConstant), U8(4),
+  /*   92 S> */ B(LdaConstant), U8(4),
                 B(Star), R(10),
                 B(LdaConstant), U8(5),
                 B(TestEqualStrict), R(10), U8(1),
@@ -79,10 +79,10 @@ bytecodes: [
                 B(Star), R(5),
                 B(LdaConstant), U8(10),
                 B(Star), R(6),
-                B(LdaConstant), U8(3),
+  /*  131 S> */ B(LdaConstant), U8(3),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(9),
-                B(LdaConstant), U8(4),
+  /*  176 S> */ B(LdaConstant), U8(4),
                 B(Star), R(10),
                 B(LdaConstant), U8(5),
                 B(TestEqualStrict), R(10), U8(1),
@@ -188,10 +188,10 @@ bytecodes: [
                 B(Star), R(7),
                 B(LdaConstant), U8(1),
                 B(Star), R(8),
-                B(LdaConstant), U8(5),
+  /*   77 S> */ B(LdaConstant), U8(5),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(11),
-                B(LdaConstant), U8(6),
+  /*  109 S> */ B(LdaConstant), U8(6),
                 B(Star), R(12),
                 B(LdaConstant), U8(7),
                 B(TestEqualStrict), R(12), U8(2),
@@ -231,10 +231,10 @@ bytecodes: [
                 B(Star), R(7),
                 B(LdaConstant), U8(12),
                 B(Star), R(8),
-                B(LdaConstant), U8(5),
+  /*  165 S> */ B(LdaConstant), U8(5),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(11),
-                B(LdaConstant), U8(6),
+  /*  210 S> */ B(LdaConstant), U8(6),
                 B(Star), R(12),
                 B(LdaConstant), U8(7),
                 B(TestEqualStrict), R(12), U8(2),
@@ -267,10 +267,10 @@ bytecodes: [
                 B(Star), R(7),
                 B(LdaConstant), U8(20),
                 B(Star), R(8),
-                B(LdaConstant), U8(5),
+  /*  333 S> */ B(LdaConstant), U8(5),
                 B(StaCurrentContextSlot), U8(4),
                 B(Star), R(11),
-                B(LdaConstant), U8(6),
+  /*  378 S> */ B(LdaConstant), U8(6),
                 B(Star), R(12),
                 B(LdaConstant), U8(7),
                 B(TestEqualStrict), R(12), U8(2),

test/debugger/debug/debug-break-class-fields.js

+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --harmony-public-fields --harmony-static-fields --allow-natives-syntax
+
+Debug = debug.Debug
+
+Debug.setListener(function() {});
+
+class Y {
+  x = 1;
+  y = 2;
+  z = 3;
+}
+
+var initializer = %GetInitializerFunction(Y);
+var b1, b2, b3;
+
+// class Y {
+//   x = [B0]1;
+//   y = [B1]2;
+//   z = [B2]3;
+// }
+b1 = Debug.setBreakPoint(initializer, 0, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("x = [B0]1;") === 0);
+Debug.clearBreakPoint(b1);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("x = [B0]1;") === -1);
+
+b2 = Debug.setBreakPoint(initializer, 1, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("y = [B0]2;") > 0);
+Debug.clearBreakPoint(b2);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("y = [B0]2;") === -1);
+
+b3 = Debug.setBreakPoint(initializer, 2, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("z = [B0]3") > 0);
+Debug.clearBreakPoint(b3);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("z = [B0]3") === -1);
+
+b1 = Debug.setBreakPoint(initializer, 0, 0);
+b2 = Debug.setBreakPoint(initializer, 1, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("x = [B0]1;") === 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("y = [B1]2;") > 0);
+Debug.clearBreakPoint(b1);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("x = [B0]1;") === -1);
+Debug.clearBreakPoint(b2);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("y = [B1]2;") === -1);
+
+b1 = Debug.setBreakPoint(initializer, 0, 0);
+b3 = Debug.setBreakPoint(initializer, 2, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("x = [B0]1;") === 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("z = [B1]3") > 0);
+Debug.clearBreakPoint(b1);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("x = [B0]1;") === -1);
+Debug.clearBreakPoint(b3);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("z = [B1]3") === -1);
+
+b2 = Debug.setBreakPoint(initializer, 1, 0);
+b3 = Debug.setBreakPoint(initializer, 2, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("y = [B0]2;") > 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("z = [B1]3") > 0);
+Debug.clearBreakPoint(b2);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("y = [B0]2;") === -1);
+Debug.clearBreakPoint(b3);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("z = [B1]3") === -1);
+
+function foo() {}
+var bar = "bar";
+
+class X {
+  [foo()] = 1;
+  [bar] = 2;
+  baz = foo();
+}
+
+// The computed properties are evaluated during class construction,
+// not as part of the initializer function. As a consequence of which,
+// they aren't breakable here in the initializer function, but
+// instead, are part of the enclosing function.
+//
+// class X {
+//   [foo()] = [B0]1;
+//   [bar] = [B1]2;
+//   [baz] = [B2]foo();
+// }
+
+initializer = %GetInitializerFunction(X);
+b1 = Debug.setBreakPoint(initializer, 0, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[foo()] = [B0]1;") === 0);
+Debug.clearBreakPoint(b1);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[foo()] = [B0]1;") === -1);
+
+b2 = Debug.setBreakPoint(initializer, 1, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[bar] = [B0]2;") > 0);
+Debug.clearBreakPoint(b2);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[bar] = [B0]2;") === -1);
+
+b3 = Debug.setBreakPoint(initializer, 2, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("baz = [B0]foo()") > 0);
+Debug.clearBreakPoint(b3);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("baz = [B0]foo()") === -1);
+
+b1 = Debug.setBreakPoint(initializer, 0, 0);
+b2 = Debug.setBreakPoint(initializer, 1, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[foo()] = [B0]1;") === 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[bar] = [B1]2;") > 0);
+Debug.clearBreakPoint(b1);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[foo()] = [B0]1;") === -1);
+Debug.clearBreakPoint(b2);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[bar] = [B1]2;") === -1);
+
+b1 = Debug.setBreakPoint(initializer, 0, 0);
+b3 = Debug.setBreakPoint(initializer, 2, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[foo()] = [B0]1;") === 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("baz = [B1]foo()") > 0);
+Debug.clearBreakPoint(b1);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[foo()] = [B0]1;") === -1);
+Debug.clearBreakPoint(b3);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("baz = [B1]foo()") === -1);
+
+b2 = Debug.setBreakPoint(initializer, 1, 0);
+b3 = Debug.setBreakPoint(initializer, 2, 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[bar] = [B0]2;") > 0);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("baz = [B1]foo()") > 0);
+Debug.clearBreakPoint(b2);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[bar] = [B0]2;") === -1);
+Debug.clearBreakPoint(b3);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("baz = [B1]foo()") === -1);
+
+function t() {
+  class X {
+    [foo()] = 1;
+  }
+}
+
+b1 = Debug.setBreakPoint(t, 0, 0);
+assertTrue(Debug.showBreakPoints(t).indexOf("[[B0]foo()] = 1;")> 0);
+Debug.clearBreakPoint(b1);
+assertTrue(Debug.showBreakPoints(initializer).indexOf("[[B0]foo()] = 1;") === -1);

test/inspector/debugger/get-possible-breakpoints-class-fields-expected.txt

+Checks Debugger.getPossibleBreakpoints for class fields
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+let x = |R|class {}
+
+|_|x = |R|class {
+  x = |_|1;
+  y = |_|2|R|;
+}
+
+|_|x = |R|class {
+  x = |C|foo();
+  y = |_|2;
+  z = |C|bar()|R|;
+}
+
+|_|x = class {
+  x = |C|foo();
+  y = |_|2;
+  z = |C|bar()|R|;
+  constructor() {
+    this.|_|x;
+  |R|}
+}
+
+|_|x = class {
+  x = |C|foo();
+  y = |_|2;
+  constructor() {
+    this.|_|x;
+  |R|}
+  z = |C|bar()|R|;
+}
+
+|_|x = class {
+  x = |C|foo();
+  y = |_|2;
+  constructor() {
+    this.|_|x;
+  |R|}
+  z = |C|bar()|R|;
+}
+
+|_|x = |R|class {
+  x = |_|1;
+  foo() {|R|}
+  y = |_|2|R|;
+}
+
+|_|x = |R|class {
+  x = (function() {
+    |C|foo();
+  |R|})|C|();
+  y = (() => {
+    |C|bar();
+  |R|})|C|()|R|;
+}
+
+|_|x = |R|class {
+  x = |_|function() {
+    |C|foo();
+  |R|}|R|;
+}
+
+|_|x = |R|class {
+  x = |_|async function() {
+    |_|await |C|foo();
+  |R|}|R|;
+}
+
+|_|x = |R|class {
+  x = |_|() => {
+    |C|foo();
+  |R|};
+  y = |_|() => |C|bar()|R|;
+}
+
+|_|x = |R|class {
+  x = |_|async () => {
+    |_|await |C|foo();
+  |R|};
+  y = |_|async () => |_|await |C|bar()|R|;
+}
+
+|_|x = |R|class {
+  [|_|x] = |_|1;
+  [|C|foo()] = |_|2|R|;
+}
+
+|_|x = |R|class {
+  [|_|x] = |_|[...this]|R|;
+}
+
+|_|x = |R|class {
+  x;
+  [|C|foo()]|R|;
+}
+
+|_|x = |R|class {
+  x = |_|function*|_|() {
+    |_|yield 1;
+  |R|}|R|;
+}
+
+|_|x = |R|class {
+  static x = |_|1;
+  static y = |_|2|R|;
+}
+
+|_|x = |R|class {
+  static x = |C|foo();
+  static y = |_|2;
+  static z = |C|bar()|R|;
+}
+
+|_|x = class {
+  static x = |C|foo();
+  static y = |_|2;
+  static z = |C|bar()|R|;
+  constructor() {
+    this.|_|x;
+  |R|}
+}
+
+|_|x = class {
+  static x = |C|foo();
+  static y = |_|2;
+  constructor() {
+    this.|_|x;
+  |R|}
+  static z = |C|bar()|R|;
+}
+
+|_|x = |R|class {
+  static x = |_|1;
+  static foo() {|R|}
+  bar() {|R|}
+  static y = |_|2|R|;
+}
+
+|_|x = |R|class {
+  static x = (function() {
+    |C|foo();
+  |R|})|C|();
+  static y = (() => {
+    |C|bar();
+  |R|})|C|()|R|;
+}
+
+|_|x = |R|class {
+  static x = |_|function() {
+    |C|foo();
+  |R|}|R|;
+}
+
+|_|x = |R|class {
+  static x = |_|async function() {
+    |_|await |C|foo();
+  |R|}|R|;
+}
+
+|_|x = |R|class {
+  static x = |_|() => {
+    |C|foo();
+  |R|};
+  static y = |_|() => |C|bar()|R|;
+}
+
+|_|x = |R|class {
+  static x = |_|async () => {
+    |_|await |C|foo();
+  |R|};
+  static y = |_|async () => |_|await |C|bar()|R|;
+}
+
+|_|x = |R|class {
+  static [|_|x] = |_|1;
+  static [|C|foo()] = |_|2|R|;
+}
+
+|_|x = |R|class {
+  static [|_|x] = |_|[...this]|R|;
+}
+
+|_|x = |R|class {
+  static x;
+  static [|C|foo()]|R|;
+}
+
+|_|x = |R|class {
+  static x = |_|function*|_|() {
+    |_|yield 1;
+  |R|}|R|;
+}
+
+|_|x = |R|class {
+  static x = |_|1;
+  y = |_|2;
+  static [|_|z] = |_|3;
+  [|_|p] = |_|4;
+  static [|C|foo()] = |_|5|R|;
+  [|C|bar()] = |_|6|R|;
+}
+|R|

test/inspector/debugger/get-possible-breakpoints-class-fields.js

+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --harmony-public-fields --harmony-static-fields
+
+let { session, contextGroup, Protocol } = InspectorTest.start(
+  "Checks Debugger.getPossibleBreakpoints for class fields"
+);
+
+(async function() {
+  session.setupScriptMap();
+  await Protocol.Debugger.enable();
+
+  const source = utils.read(
+    "test/inspector/debugger/resources/break-locations-class-fields.js"
+  );
+
+  contextGroup.addScript(source);
+
+  const {
+    params: { scriptId }
+  } = await Protocol.Debugger.onceScriptParsed();
+
+  const {
+    result: { locations }
+  } = await Protocol.Debugger.getPossibleBreakpoints({
+    start: {
+      lineNumber: 0,
+      columnNumber: 0,
+      scriptId
+    }
+  });
+
+  session.logBreakLocations(locations);
+  InspectorTest.completeTest();
+})();

test/inspector/debugger/resources/break-locations-class-fields.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+let x = class {}
+
+x = class {
+  x = 1;
+  y = 2;
+}
+
+x = class {
+  x = foo();
+  y = 2;
+  z = bar();
+}
+
+x = class {
+  x = foo();
+  y = 2;
+  z = bar();
+  constructor() {
+    this.x;
+  }
+}
+
+x = class {
+  x = foo();
+  y = 2;
+  constructor() {
+    this.x;
+  }
+  z = bar();
+}
+
+x = class {
+  x = foo();
+  y = 2;
+  constructor() {
+    this.x;
+  }
+  z = bar();
+}
+
+x = class {
+  x = 1;
+  foo() {}
+  y = 2;
+}
+
+x = class {
+  x = (function() {
+    foo();
+  })();
+  y = (() => {
+    bar();
+  })();
+}
+
+x = class {
+  x = function() {
+    foo();
+  };
+}
+
+x = class {
+  x = async function() {
+    await foo();
+  };
+}
+
+x = class {
+  x = () => {
+    foo();
+  };
+  y = () => bar();
+}
+
+x = class {
+  x = async () => {
+    await foo();
+  };
+  y = async () => await bar();
+}
+
+x = class {
+  [x] = 1;
+  [foo()] = 2;
+}
+
+x = class {
+  [x] = [...this];
+}
+
+x = class {
+  x;
+  [foo()];
+}
+
+x = class {
+  x = function*() {
+    yield 1;
+  };
+}
+
+x = class {
+  static x = 1;
+  static y = 2;
+}
+
+x = class {
+  static x = foo();
+  static y = 2;
+  static z = bar();
+}
+
+x = class {
+  static x = foo();
+  static y = 2;
+  static z = bar();
+  constructor() {
+    this.x;
+  }
+}
+
+x = class {
+  static x = foo();
+  static y = 2;
+  constructor() {
+    this.x;
+  }
+  static z = bar();
+}
+
+x = class {
+  static x = 1;
+  static foo() {}
+  bar() {}
+  static y = 2;
+}
+
+x = class {
+  static x = (function() {
+    foo();
+  })();
+  static y = (() => {
+    bar();
+  })();
+}
+
+x = class {
+  static x = function() {
+    foo();
+  };
+}
+
+x = class {
+  static x = async function() {
+    await foo();
+  };
+}
+
+x = class {
+  static x = () => {
+    foo();
+  };
+  static y = () => bar();
+}
+
+x = class {
+  static x = async () => {
+    await foo();
+  };
+  static y = async () => await bar();
+}
+
+x = class {
+  static [x] = 1;
+  static [foo()] = 2;
+}
+
+x = class {
+  static [x] = [...this];
+}
+
+x = class {
+  static x;
+  static [foo()];
+}
+
+x = class {
+  static x = function*() {
+    yield 1;
+  };
+}
+
+x = class {
+  static x = 1;
+  y = 2;
+  static [z] = 3;
+  [p] = 4;
+  static [foo()] = 5;
+  [bar()] = 6;
+}

test/message/fail/class-fields-computed.js

+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --harmony-public-fields
+
+class X {
+  [foo()] = 1;
+}

test/message/fail/class-fields-computed.out

+*%(basename)s:8: ReferenceError: foo is not defined
+  [foo()] = 1;
+   ^
+ReferenceError: foo is not defined
+    at *%(basename)s:8:4
\ No newline at end of file

test/message/fail/class-fields-static-throw.js

+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --harmony-public-fields --harmony-static-fields
+//
+// TODO(gsathya): Remove 'Function' from stack trace.
+
+class X {
+  static x = foo();
+}

test/message/fail/class-fields-static-throw.out

+*%(basename)s:10: ReferenceError: foo is not defined
+  static x = foo();
+             ^
+ReferenceError: foo is not defined
+    at Function.<static_fields_initializer> (*%(basename)s:10:14)
+    at *%(basename)s:1:1
\ No newline at end of file

test/message/fail/class-fields-throw.js

+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --harmony-public-fields
+
+class X {
+  x = foo();
+}
+
+new X;

test/message/fail/class-fields-throw.out

+*%(basename)s:8: ReferenceError: foo is not defined
+  x = foo();
+      ^
+ReferenceError: foo is not defined
+    at X.<instance_fields_initializer> (*%(basename)s:8:7)
+    at new X (*%(basename)s:7:1)
+    at *%(basename)s:11:1
\ No newline at end of file