commit b07da893600eadc4efafc5a54b8f9533e43c0034
author Alexander Thomas <athom@google.com> Wed Aug 26 12:44:28 2020 +0200
committer Alexander Thomas <athom@google.com> Wed Aug 26 12:44:28 2020 +0200
tree b31f9c714b73d139f3bbedb583c8b2529b87f242
parent e940ff7819053ed8a4c04a4dfcda7df12e969331
parent bffe375afa5ba387b6bff683a430a33b4319929e

Version 2.9.2

* Cherry-pick 5e551dd926969dc2642cc027fd9215c7365f707b to stable
* Cherry-pick 62093ca8ede6cac91c9724907b31a05bb85cac56 to stable

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index bbd8830..2268a6b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## 2.9.2 - 2020-08-26
+
+This is a patch release that fixes transient StackOverflow exceptions when
+building Flutter applications (issue [flutter/flutter#63560][]).
+
+[flutter/flutter#63560]: https://github.com/flutter/flutter/issues/63560
+
 ## 2.9.1 - 2020-08-12
 
 This is a patch release that fixes unhandled exceptions in some Flutter

pkg/vm/lib/transformations/type_flow/analysis.dart

diff --git a/pkg/vm/lib/transformations/type_flow/analysis.dart b/pkg/vm/lib/transformations/type_flow/analysis.dart
index fd794b1..d35e0a0 100644
--- a/pkg/vm/lib/transformations/type_flow/analysis.dart
+++ b/pkg/vm/lib/transformations/type_flow/analysis.dart
@@ -108,6 +108,36 @@
   /// Used for recursive calls while this invocation is being processed.
   Type get resultForRecursiveInvocation => result;
 
+  /// Use [type] as a current computed result of this invocation.
+  /// If this invocation was invalidated, and the invalidated result is
+  /// different, then invalidate all dependent invocations as well.
+  /// Result type may be saturated if this invocation was invalidated
+  /// too many times.
+  void setResult(TypeFlowAnalysis typeFlowAnalysis, Type type) {
+    assertx(type != null);
+    result = type;
+
+    if (invalidatedResult != null) {
+      if (invalidatedResult != result) {
+        invalidateDependentInvocations(typeFlowAnalysis.workList);
+
+        invalidationCounter++;
+        Statistics.maxInvalidationsPerInvocation =
+            max(Statistics.maxInvalidationsPerInvocation, invalidationCounter);
+        // In rare cases, loops in dependencies and approximation of
+        // recursive invocations may cause infinite bouncing of result
+        // types. To prevent infinite looping and guarantee convergence of
+        // the analysis, result is saturated after invocation is invalidated
+        // at least [_Invocation.invalidationLimit] times.
+        if (invalidationCounter > _Invocation.invalidationLimit) {
+          result =
+              result.union(invalidatedResult, typeFlowAnalysis.hierarchyCache);
+        }
+      }
+      invalidatedResult = null;
+    }
+  }
+
   // Only take selector and args into account as _Invocation objects
   // are cached in _InvocationsCache using selector and args as a key.
   @override
@@ -261,7 +291,7 @@
         if (summaryResult is Type &&
             !typeFlowAnalysis.workList._isPending(this)) {
           assertx(result == null || result == summaryResult);
-          result = summaryResult;
+          setResult(typeFlowAnalysis, summaryResult);
         }
         return summary.apply(
             args, typeFlowAnalysis.hierarchyCache, typeFlowAnalysis);
@@ -1220,6 +1250,7 @@
   void invalidateInvocation(_Invocation invocation) {
     Statistics.invocationsInvalidated++;
     if (invocation.result != null) {
+      assertx(invocation.invalidatedResult == null);
       invocation.invalidatedResult = invocation.result;
       invocation.result = null;
     }
@@ -1269,45 +1300,62 @@
 
     // Test if tracing is enabled to avoid expensive message formatting.
     if (kPrintTrace) {
-      tracePrint('PROCESSING $invocation', 1);
+      tracePrint(
+          'PROCESSING $invocation, invalidatedResult ${invocation.invalidatedResult}',
+          1);
     }
 
     if (processing.add(invocation)) {
+      // Do not process too many calls in the call stack as
+      // it may cause stack overflow in the analysis.
+      const int kMaxCallsInCallStack = 500;
+      if (callStack.length > kMaxCallsInCallStack) {
+        Statistics.deepInvocationsDeferred++;
+        // If there is invalidatedResult, then use it.
+        // When actual result is inferred it will be compared against
+        // invalidatedResult and all dependent invocations will be invalidated
+        // accordingly.
+        //
+        // Otherwise, if invocation is not invalidated yet, use empty type
+        // as a result but immediately invalidate it in order to recompute.
+        // Static type would be too inaccurate.
+        if (invocation.invalidatedResult == null) {
+          invocation.result = const EmptyType();
+        }
+        // Conservatively assume that this invocation may trigger
+        // parameter type checks. This is needed because caller may not be
+        // invalidated and recomputed if this invocation yields the
+        // same result.
+        invocation.typeChecksNeeded = true;
+        invalidateInvocation(invocation);
+        assertx(invocation.result == null);
+        assertx(invocation.invalidatedResult != null);
+        assertx(_isPending(invocation));
+        if (kPrintTrace) {
+          tracePrint("Processing deferred due to deep call stack.");
+          tracePrint(
+              'END PROCESSING $invocation, RESULT ${invocation.invalidatedResult}',
+              -1);
+        }
+        processing.remove(invocation);
+        return invocation.invalidatedResult;
+      }
+
       callStack.add(invocation);
       pending.remove(invocation);
 
       Type result = invocation.process(_typeFlowAnalysis);
 
-      assertx(result != null);
-      invocation.result = result;
+      invocation.setResult(_typeFlowAnalysis, result);
 
-      if (invocation.invalidatedResult != null) {
-        if (invocation.invalidatedResult != result) {
-          invocation.invalidateDependentInvocations(this);
-
-          invocation.invalidationCounter++;
-          Statistics.maxInvalidationsPerInvocation = max(
-              Statistics.maxInvalidationsPerInvocation,
-              invocation.invalidationCounter);
-          // In rare cases, loops in dependencies and approximation of
-          // recursive invocations may cause infinite bouncing of result
-          // types. To prevent infinite looping and guarantee convergence of
-          // the analysis, result is saturated after invocation is invalidated
-          // at least [_Invocation.invalidationLimit] times.
-          if (invocation.invalidationCounter > _Invocation.invalidationLimit) {
-            result = result.union(
-                invocation.invalidatedResult, _typeFlowAnalysis.hierarchyCache);
-            invocation.result = result;
-          }
-        }
-        invocation.invalidatedResult = null;
-      }
+      // setResult may saturate result to ensure convergence.
+      result = invocation.result;
 
       // Invocation is still pending - it was invalidated while being processed.
       // Move result to invalidatedResult.
       if (_isPending(invocation)) {
         Statistics.invocationsInvalidatedDuringProcessing++;
-        invocation.invalidatedResult = result;
+        invocation.invalidatedResult = invocation.result;
         invocation.result = null;
       }
 

pkg/vm/lib/transformations/type_flow/utils.dart

diff --git a/pkg/vm/lib/transformations/type_flow/utils.dart b/pkg/vm/lib/transformations/type_flow/utils.dart
index b7cebd7..05a46b4 100644
--- a/pkg/vm/lib/transformations/type_flow/utils.dart
+++ b/pkg/vm/lib/transformations/type_flow/utils.dart
@@ -148,6 +148,7 @@
   static int maxInvocationsCachedPerSelector = 0;
   static int approximateInvocationsCreated = 0;
   static int approximateInvocationsUsed = 0;
+  static int deepInvocationsDeferred = 0;
   static int classesDropped = 0;
   static int membersDropped = 0;
   static int methodBodiesDropped = 0;
@@ -177,6 +178,7 @@
     maxInvocationsCachedPerSelector = 0;
     approximateInvocationsCreated = 0;
     approximateInvocationsUsed = 0;
+    deepInvocationsDeferred = 0;
     classesDropped = 0;
     membersDropped = 0;
     methodBodiesDropped = 0;
@@ -207,6 +209,7 @@
     ${maxInvocationsCachedPerSelector} maximum invocations cached per selector
     ${approximateInvocationsCreated} approximate invocations created
     ${approximateInvocationsUsed} times approximate invocation is used
+    ${deepInvocationsDeferred} times invocation processing was deferred due to deep call stack
     ${classesDropped} classes dropped
     ${membersDropped} members dropped
     ${methodBodiesDropped} method bodies dropped

runtime/tests/vm/dart/regress_flutter_63560_test.dart

diff --git a/runtime/tests/vm/dart/regress_flutter_63560_test.dart b/runtime/tests/vm/dart/regress_flutter_63560_test.dart
new file mode 100644
index 0000000..717e814
--- /dev/null
+++ b/runtime/tests/vm/dart/regress_flutter_63560_test.dart
@@ -0,0 +1,1038 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+//
+// Verifies that TFA doesn't crash with stack overflow if program
+// has deeply nested calls.
+// Regression test for https://github.com/flutter/flutter/issues/63560.
+// Generated using the following:
+/*
+void main() {
+  final N = 1000;
+  print("""
+import 'package:expect/expect.dart';
+
+class A {
+  Object m0(Object o) => o;""");
+  for (var i = 1; i < N; i++) {
+    print("  Object m${i}(Object o) => m${i - 1}(o);");
+  }
+  print("""}
+
+void main() {
+  final x = A().m${N - 1}(10);
+  Expect.equals(10, x);
+}
+""");
+}
+ */
+
+import 'package:expect/expect.dart';
+
+class A {
+  Object m0(Object o) => o;
+  Object m1(Object o) => m0(o);
+  Object m2(Object o) => m1(o);
+  Object m3(Object o) => m2(o);
+  Object m4(Object o) => m3(o);
+  Object m5(Object o) => m4(o);
+  Object m6(Object o) => m5(o);
+  Object m7(Object o) => m6(o);
+  Object m8(Object o) => m7(o);
+  Object m9(Object o) => m8(o);
+  Object m10(Object o) => m9(o);
+  Object m11(Object o) => m10(o);
+  Object m12(Object o) => m11(o);
+  Object m13(Object o) => m12(o);
+  Object m14(Object o) => m13(o);
+  Object m15(Object o) => m14(o);
+  Object m16(Object o) => m15(o);
+  Object m17(Object o) => m16(o);
+  Object m18(Object o) => m17(o);
+  Object m19(Object o) => m18(o);
+  Object m20(Object o) => m19(o);
+  Object m21(Object o) => m20(o);
+  Object m22(Object o) => m21(o);
+  Object m23(Object o) => m22(o);
+  Object m24(Object o) => m23(o);
+  Object m25(Object o) => m24(o);
+  Object m26(Object o) => m25(o);
+  Object m27(Object o) => m26(o);
+  Object m28(Object o) => m27(o);
+  Object m29(Object o) => m28(o);
+  Object m30(Object o) => m29(o);
+  Object m31(Object o) => m30(o);
+  Object m32(Object o) => m31(o);
+  Object m33(Object o) => m32(o);
+  Object m34(Object o) => m33(o);
+  Object m35(Object o) => m34(o);
+  Object m36(Object o) => m35(o);
+  Object m37(Object o) => m36(o);
+  Object m38(Object o) => m37(o);
+  Object m39(Object o) => m38(o);
+  Object m40(Object o) => m39(o);
+  Object m41(Object o) => m40(o);
+  Object m42(Object o) => m41(o);
+  Object m43(Object o) => m42(o);
+  Object m44(Object o) => m43(o);
+  Object m45(Object o) => m44(o);
+  Object m46(Object o) => m45(o);
+  Object m47(Object o) => m46(o);
+  Object m48(Object o) => m47(o);
+  Object m49(Object o) => m48(o);
+  Object m50(Object o) => m49(o);
+  Object m51(Object o) => m50(o);
+  Object m52(Object o) => m51(o);
+  Object m53(Object o) => m52(o);
+  Object m54(Object o) => m53(o);
+  Object m55(Object o) => m54(o);
+  Object m56(Object o) => m55(o);
+  Object m57(Object o) => m56(o);
+  Object m58(Object o) => m57(o);
+  Object m59(Object o) => m58(o);
+  Object m60(Object o) => m59(o);
+  Object m61(Object o) => m60(o);
+  Object m62(Object o) => m61(o);
+  Object m63(Object o) => m62(o);
+  Object m64(Object o) => m63(o);
+  Object m65(Object o) => m64(o);
+  Object m66(Object o) => m65(o);
+  Object m67(Object o) => m66(o);
+  Object m68(Object o) => m67(o);
+  Object m69(Object o) => m68(o);
+  Object m70(Object o) => m69(o);
+  Object m71(Object o) => m70(o);
+  Object m72(Object o) => m71(o);
+  Object m73(Object o) => m72(o);
+  Object m74(Object o) => m73(o);
+  Object m75(Object o) => m74(o);
+  Object m76(Object o) => m75(o);
+  Object m77(Object o) => m76(o);
+  Object m78(Object o) => m77(o);
+  Object m79(Object o) => m78(o);
+  Object m80(Object o) => m79(o);
+  Object m81(Object o) => m80(o);
+  Object m82(Object o) => m81(o);
+  Object m83(Object o) => m82(o);
+  Object m84(Object o) => m83(o);
+  Object m85(Object o) => m84(o);
+  Object m86(Object o) => m85(o);
+  Object m87(Object o) => m86(o);
+  Object m88(Object o) => m87(o);
+  Object m89(Object o) => m88(o);
+  Object m90(Object o) => m89(o);
+  Object m91(Object o) => m90(o);
+  Object m92(Object o) => m91(o);
+  Object m93(Object o) => m92(o);
+  Object m94(Object o) => m93(o);
+  Object m95(Object o) => m94(o);
+  Object m96(Object o) => m95(o);
+  Object m97(Object o) => m96(o);
+  Object m98(Object o) => m97(o);
+  Object m99(Object o) => m98(o);
+  Object m100(Object o) => m99(o);
+  Object m101(Object o) => m100(o);
+  Object m102(Object o) => m101(o);
+  Object m103(Object o) => m102(o);
+  Object m104(Object o) => m103(o);
+  Object m105(Object o) => m104(o);
+  Object m106(Object o) => m105(o);
+  Object m107(Object o) => m106(o);
+  Object m108(Object o) => m107(o);
+  Object m109(Object o) => m108(o);
+  Object m110(Object o) => m109(o);
+  Object m111(Object o) => m110(o);
+  Object m112(Object o) => m111(o);
+  Object m113(Object o) => m112(o);
+  Object m114(Object o) => m113(o);
+  Object m115(Object o) => m114(o);
+  Object m116(Object o) => m115(o);
+  Object m117(Object o) => m116(o);
+  Object m118(Object o) => m117(o);
+  Object m119(Object o) => m118(o);
+  Object m120(Object o) => m119(o);
+  Object m121(Object o) => m120(o);
+  Object m122(Object o) => m121(o);
+  Object m123(Object o) => m122(o);
+  Object m124(Object o) => m123(o);
+  Object m125(Object o) => m124(o);
+  Object m126(Object o) => m125(o);
+  Object m127(Object o) => m126(o);
+  Object m128(Object o) => m127(o);
+  Object m129(Object o) => m128(o);
+  Object m130(Object o) => m129(o);
+  Object m131(Object o) => m130(o);
+  Object m132(Object o) => m131(o);
+  Object m133(Object o) => m132(o);
+  Object m134(Object o) => m133(o);
+  Object m135(Object o) => m134(o);
+  Object m136(Object o) => m135(o);
+  Object m137(Object o) => m136(o);
+  Object m138(Object o) => m137(o);
+  Object m139(Object o) => m138(o);
+  Object m140(Object o) => m139(o);
+  Object m141(Object o) => m140(o);
+  Object m142(Object o) => m141(o);
+  Object m143(Object o) => m142(o);
+  Object m144(Object o) => m143(o);
+  Object m145(Object o) => m144(o);
+  Object m146(Object o) => m145(o);
+  Object m147(Object o) => m146(o);
+  Object m148(Object o) => m147(o);
+  Object m149(Object o) => m148(o);
+  Object m150(Object o) => m149(o);
+  Object m151(Object o) => m150(o);
+  Object m152(Object o) => m151(o);
+  Object m153(Object o) => m152(o);
+  Object m154(Object o) => m153(o);
+  Object m155(Object o) => m154(o);
+  Object m156(Object o) => m155(o);
+  Object m157(Object o) => m156(o);
+  Object m158(Object o) => m157(o);
+  Object m159(Object o) => m158(o);
+  Object m160(Object o) => m159(o);
+  Object m161(Object o) => m160(o);
+  Object m162(Object o) => m161(o);
+  Object m163(Object o) => m162(o);
+  Object m164(Object o) => m163(o);
+  Object m165(Object o) => m164(o);
+  Object m166(Object o) => m165(o);
+  Object m167(Object o) => m166(o);
+  Object m168(Object o) => m167(o);
+  Object m169(Object o) => m168(o);
+  Object m170(Object o) => m169(o);
+  Object m171(Object o) => m170(o);
+  Object m172(Object o) => m171(o);
+  Object m173(Object o) => m172(o);
+  Object m174(Object o) => m173(o);
+  Object m175(Object o) => m174(o);
+  Object m176(Object o) => m175(o);
+  Object m177(Object o) => m176(o);
+  Object m178(Object o) => m177(o);
+  Object m179(Object o) => m178(o);
+  Object m180(Object o) => m179(o);
+  Object m181(Object o) => m180(o);
+  Object m182(Object o) => m181(o);
+  Object m183(Object o) => m182(o);
+  Object m184(Object o) => m183(o);
+  Object m185(Object o) => m184(o);
+  Object m186(Object o) => m185(o);
+  Object m187(Object o) => m186(o);
+  Object m188(Object o) => m187(o);
+  Object m189(Object o) => m188(o);
+  Object m190(Object o) => m189(o);
+  Object m191(Object o) => m190(o);
+  Object m192(Object o) => m191(o);
+  Object m193(Object o) => m192(o);
+  Object m194(Object o) => m193(o);
+  Object m195(Object o) => m194(o);
+  Object m196(Object o) => m195(o);
+  Object m197(Object o) => m196(o);
+  Object m198(Object o) => m197(o);
+  Object m199(Object o) => m198(o);
+  Object m200(Object o) => m199(o);
+  Object m201(Object o) => m200(o);
+  Object m202(Object o) => m201(o);
+  Object m203(Object o) => m202(o);
+  Object m204(Object o) => m203(o);
+  Object m205(Object o) => m204(o);
+  Object m206(Object o) => m205(o);
+  Object m207(Object o) => m206(o);
+  Object m208(Object o) => m207(o);
+  Object m209(Object o) => m208(o);
+  Object m210(Object o) => m209(o);
+  Object m211(Object o) => m210(o);
+  Object m212(Object o) => m211(o);
+  Object m213(Object o) => m212(o);
+  Object m214(Object o) => m213(o);
+  Object m215(Object o) => m214(o);
+  Object m216(Object o) => m215(o);
+  Object m217(Object o) => m216(o);
+  Object m218(Object o) => m217(o);
+  Object m219(Object o) => m218(o);
+  Object m220(Object o) => m219(o);
+  Object m221(Object o) => m220(o);
+  Object m222(Object o) => m221(o);
+  Object m223(Object o) => m222(o);
+  Object m224(Object o) => m223(o);
+  Object m225(Object o) => m224(o);
+  Object m226(Object o) => m225(o);
+  Object m227(Object o) => m226(o);
+  Object m228(Object o) => m227(o);
+  Object m229(Object o) => m228(o);
+  Object m230(Object o) => m229(o);
+  Object m231(Object o) => m230(o);
+  Object m232(Object o) => m231(o);
+  Object m233(Object o) => m232(o);
+  Object m234(Object o) => m233(o);
+  Object m235(Object o) => m234(o);
+  Object m236(Object o) => m235(o);
+  Object m237(Object o) => m236(o);
+  Object m238(Object o) => m237(o);
+  Object m239(Object o) => m238(o);
+  Object m240(Object o) => m239(o);
+  Object m241(Object o) => m240(o);
+  Object m242(Object o) => m241(o);
+  Object m243(Object o) => m242(o);
+  Object m244(Object o) => m243(o);
+  Object m245(Object o) => m244(o);
+  Object m246(Object o) => m245(o);
+  Object m247(Object o) => m246(o);
+  Object m248(Object o) => m247(o);
+  Object m249(Object o) => m248(o);
+  Object m250(Object o) => m249(o);
+  Object m251(Object o) => m250(o);
+  Object m252(Object o) => m251(o);
+  Object m253(Object o) => m252(o);
+  Object m254(Object o) => m253(o);
+  Object m255(Object o) => m254(o);
+  Object m256(Object o) => m255(o);
+  Object m257(Object o) => m256(o);
+  Object m258(Object o) => m257(o);
+  Object m259(Object o) => m258(o);
+  Object m260(Object o) => m259(o);
+  Object m261(Object o) => m260(o);
+  Object m262(Object o) => m261(o);
+  Object m263(Object o) => m262(o);
+  Object m264(Object o) => m263(o);
+  Object m265(Object o) => m264(o);
+  Object m266(Object o) => m265(o);
+  Object m267(Object o) => m266(o);
+  Object m268(Object o) => m267(o);
+  Object m269(Object o) => m268(o);
+  Object m270(Object o) => m269(o);
+  Object m271(Object o) => m270(o);
+  Object m272(Object o) => m271(o);
+  Object m273(Object o) => m272(o);
+  Object m274(Object o) => m273(o);
+  Object m275(Object o) => m274(o);
+  Object m276(Object o) => m275(o);
+  Object m277(Object o) => m276(o);
+  Object m278(Object o) => m277(o);
+  Object m279(Object o) => m278(o);
+  Object m280(Object o) => m279(o);
+  Object m281(Object o) => m280(o);
+  Object m282(Object o) => m281(o);
+  Object m283(Object o) => m282(o);
+  Object m284(Object o) => m283(o);
+  Object m285(Object o) => m284(o);
+  Object m286(Object o) => m285(o);
+  Object m287(Object o) => m286(o);
+  Object m288(Object o) => m287(o);
+  Object m289(Object o) => m288(o);
+  Object m290(Object o) => m289(o);
+  Object m291(Object o) => m290(o);
+  Object m292(Object o) => m291(o);
+  Object m293(Object o) => m292(o);
+  Object m294(Object o) => m293(o);
+  Object m295(Object o) => m294(o);
+  Object m296(Object o) => m295(o);
+  Object m297(Object o) => m296(o);
+  Object m298(Object o) => m297(o);
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+  Object m772(Object o) => m771(o);
+  Object m773(Object o) => m772(o);
+  Object m774(Object o) => m773(o);
+  Object m775(Object o) => m774(o);
+  Object m776(Object o) => m775(o);
+  Object m777(Object o) => m776(o);
+  Object m778(Object o) => m777(o);
+  Object m779(Object o) => m778(o);
+  Object m780(Object o) => m779(o);
+  Object m781(Object o) => m780(o);
+  Object m782(Object o) => m781(o);
+  Object m783(Object o) => m782(o);
+  Object m784(Object o) => m783(o);
+  Object m785(Object o) => m784(o);
+  Object m786(Object o) => m785(o);
+  Object m787(Object o) => m786(o);
+  Object m788(Object o) => m787(o);
+  Object m789(Object o) => m788(o);
+  Object m790(Object o) => m789(o);
+  Object m791(Object o) => m790(o);
+  Object m792(Object o) => m791(o);
+  Object m793(Object o) => m792(o);
+  Object m794(Object o) => m793(o);
+  Object m795(Object o) => m794(o);
+  Object m796(Object o) => m795(o);
+  Object m797(Object o) => m796(o);
+  Object m798(Object o) => m797(o);
+  Object m799(Object o) => m798(o);
+  Object m800(Object o) => m799(o);
+  Object m801(Object o) => m800(o);
+  Object m802(Object o) => m801(o);
+  Object m803(Object o) => m802(o);
+  Object m804(Object o) => m803(o);
+  Object m805(Object o) => m804(o);
+  Object m806(Object o) => m805(o);
+  Object m807(Object o) => m806(o);
+  Object m808(Object o) => m807(o);
+  Object m809(Object o) => m808(o);
+  Object m810(Object o) => m809(o);
+  Object m811(Object o) => m810(o);
+  Object m812(Object o) => m811(o);
+  Object m813(Object o) => m812(o);
+  Object m814(Object o) => m813(o);
+  Object m815(Object o) => m814(o);
+  Object m816(Object o) => m815(o);
+  Object m817(Object o) => m816(o);
+  Object m818(Object o) => m817(o);
+  Object m819(Object o) => m818(o);
+  Object m820(Object o) => m819(o);
+  Object m821(Object o) => m820(o);
+  Object m822(Object o) => m821(o);
+  Object m823(Object o) => m822(o);
+  Object m824(Object o) => m823(o);
+  Object m825(Object o) => m824(o);
+  Object m826(Object o) => m825(o);
+  Object m827(Object o) => m826(o);
+  Object m828(Object o) => m827(o);
+  Object m829(Object o) => m828(o);
+  Object m830(Object o) => m829(o);
+  Object m831(Object o) => m830(o);
+  Object m832(Object o) => m831(o);
+  Object m833(Object o) => m832(o);
+  Object m834(Object o) => m833(o);
+  Object m835(Object o) => m834(o);
+  Object m836(Object o) => m835(o);
+  Object m837(Object o) => m836(o);
+  Object m838(Object o) => m837(o);
+  Object m839(Object o) => m838(o);
+  Object m840(Object o) => m839(o);
+  Object m841(Object o) => m840(o);
+  Object m842(Object o) => m841(o);
+  Object m843(Object o) => m842(o);
+  Object m844(Object o) => m843(o);
+  Object m845(Object o) => m844(o);
+  Object m846(Object o) => m845(o);
+  Object m847(Object o) => m846(o);
+  Object m848(Object o) => m847(o);
+  Object m849(Object o) => m848(o);
+  Object m850(Object o) => m849(o);
+  Object m851(Object o) => m850(o);
+  Object m852(Object o) => m851(o);
+  Object m853(Object o) => m852(o);
+  Object m854(Object o) => m853(o);
+  Object m855(Object o) => m854(o);
+  Object m856(Object o) => m855(o);
+  Object m857(Object o) => m856(o);
+  Object m858(Object o) => m857(o);
+  Object m859(Object o) => m858(o);
+  Object m860(Object o) => m859(o);
+  Object m861(Object o) => m860(o);
+  Object m862(Object o) => m861(o);
+  Object m863(Object o) => m862(o);
+  Object m864(Object o) => m863(o);
+  Object m865(Object o) => m864(o);
+  Object m866(Object o) => m865(o);
+  Object m867(Object o) => m866(o);
+  Object m868(Object o) => m867(o);
+  Object m869(Object o) => m868(o);
+  Object m870(Object o) => m869(o);
+  Object m871(Object o) => m870(o);
+  Object m872(Object o) => m871(o);
+  Object m873(Object o) => m872(o);
+  Object m874(Object o) => m873(o);
+  Object m875(Object o) => m874(o);
+  Object m876(Object o) => m875(o);
+  Object m877(Object o) => m876(o);
+  Object m878(Object o) => m877(o);
+  Object m879(Object o) => m878(o);
+  Object m880(Object o) => m879(o);
+  Object m881(Object o) => m880(o);
+  Object m882(Object o) => m881(o);
+  Object m883(Object o) => m882(o);
+  Object m884(Object o) => m883(o);
+  Object m885(Object o) => m884(o);
+  Object m886(Object o) => m885(o);
+  Object m887(Object o) => m886(o);
+  Object m888(Object o) => m887(o);
+  Object m889(Object o) => m888(o);
+  Object m890(Object o) => m889(o);
+  Object m891(Object o) => m890(o);
+  Object m892(Object o) => m891(o);
+  Object m893(Object o) => m892(o);
+  Object m894(Object o) => m893(o);
+  Object m895(Object o) => m894(o);
+  Object m896(Object o) => m895(o);
+  Object m897(Object o) => m896(o);
+  Object m898(Object o) => m897(o);
+  Object m899(Object o) => m898(o);
+  Object m900(Object o) => m899(o);
+  Object m901(Object o) => m900(o);
+  Object m902(Object o) => m901(o);
+  Object m903(Object o) => m902(o);
+  Object m904(Object o) => m903(o);
+  Object m905(Object o) => m904(o);
+  Object m906(Object o) => m905(o);
+  Object m907(Object o) => m906(o);
+  Object m908(Object o) => m907(o);
+  Object m909(Object o) => m908(o);
+  Object m910(Object o) => m909(o);
+  Object m911(Object o) => m910(o);
+  Object m912(Object o) => m911(o);
+  Object m913(Object o) => m912(o);
+  Object m914(Object o) => m913(o);
+  Object m915(Object o) => m914(o);
+  Object m916(Object o) => m915(o);
+  Object m917(Object o) => m916(o);
+  Object m918(Object o) => m917(o);
+  Object m919(Object o) => m918(o);
+  Object m920(Object o) => m919(o);
+  Object m921(Object o) => m920(o);
+  Object m922(Object o) => m921(o);
+  Object m923(Object o) => m922(o);
+  Object m924(Object o) => m923(o);
+  Object m925(Object o) => m924(o);
+  Object m926(Object o) => m925(o);
+  Object m927(Object o) => m926(o);
+  Object m928(Object o) => m927(o);
+  Object m929(Object o) => m928(o);
+  Object m930(Object o) => m929(o);
+  Object m931(Object o) => m930(o);
+  Object m932(Object o) => m931(o);
+  Object m933(Object o) => m932(o);
+  Object m934(Object o) => m933(o);
+  Object m935(Object o) => m934(o);
+  Object m936(Object o) => m935(o);
+  Object m937(Object o) => m936(o);
+  Object m938(Object o) => m937(o);
+  Object m939(Object o) => m938(o);
+  Object m940(Object o) => m939(o);
+  Object m941(Object o) => m940(o);
+  Object m942(Object o) => m941(o);
+  Object m943(Object o) => m942(o);
+  Object m944(Object o) => m943(o);
+  Object m945(Object o) => m944(o);
+  Object m946(Object o) => m945(o);
+  Object m947(Object o) => m946(o);
+  Object m948(Object o) => m947(o);
+  Object m949(Object o) => m948(o);
+  Object m950(Object o) => m949(o);
+  Object m951(Object o) => m950(o);
+  Object m952(Object o) => m951(o);
+  Object m953(Object o) => m952(o);
+  Object m954(Object o) => m953(o);
+  Object m955(Object o) => m954(o);
+  Object m956(Object o) => m955(o);
+  Object m957(Object o) => m956(o);
+  Object m958(Object o) => m957(o);
+  Object m959(Object o) => m958(o);
+  Object m960(Object o) => m959(o);
+  Object m961(Object o) => m960(o);
+  Object m962(Object o) => m961(o);
+  Object m963(Object o) => m962(o);
+  Object m964(Object o) => m963(o);
+  Object m965(Object o) => m964(o);
+  Object m966(Object o) => m965(o);
+  Object m967(Object o) => m966(o);
+  Object m968(Object o) => m967(o);
+  Object m969(Object o) => m968(o);
+  Object m970(Object o) => m969(o);
+  Object m971(Object o) => m970(o);
+  Object m972(Object o) => m971(o);
+  Object m973(Object o) => m972(o);
+  Object m974(Object o) => m973(o);
+  Object m975(Object o) => m974(o);
+  Object m976(Object o) => m975(o);
+  Object m977(Object o) => m976(o);
+  Object m978(Object o) => m977(o);
+  Object m979(Object o) => m978(o);
+  Object m980(Object o) => m979(o);
+  Object m981(Object o) => m980(o);
+  Object m982(Object o) => m981(o);
+  Object m983(Object o) => m982(o);
+  Object m984(Object o) => m983(o);
+  Object m985(Object o) => m984(o);
+  Object m986(Object o) => m985(o);
+  Object m987(Object o) => m986(o);
+  Object m988(Object o) => m987(o);
+  Object m989(Object o) => m988(o);
+  Object m990(Object o) => m989(o);
+  Object m991(Object o) => m990(o);
+  Object m992(Object o) => m991(o);
+  Object m993(Object o) => m992(o);
+  Object m994(Object o) => m993(o);
+  Object m995(Object o) => m994(o);
+  Object m996(Object o) => m995(o);
+  Object m997(Object o) => m996(o);
+  Object m998(Object o) => m997(o);
+  Object m999(Object o) => m998(o);
+}
+
+void main() {
+  final x = A().m999(10);
+  Expect.equals(10, x);
+}

runtime/tests/vm/dart_2/regress_flutter_63560_test.dart

diff --git a/runtime/tests/vm/dart_2/regress_flutter_63560_test.dart b/runtime/tests/vm/dart_2/regress_flutter_63560_test.dart
new file mode 100644
index 0000000..717e814
--- /dev/null
+++ b/runtime/tests/vm/dart_2/regress_flutter_63560_test.dart
@@ -0,0 +1,1038 @@
+// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+//
+// Verifies that TFA doesn't crash with stack overflow if program
+// has deeply nested calls.
+// Regression test for https://github.com/flutter/flutter/issues/63560.
+// Generated using the following:
+/*
+void main() {
+  final N = 1000;
+  print("""
+import 'package:expect/expect.dart';
+
+class A {
+  Object m0(Object o) => o;""");
+  for (var i = 1; i < N; i++) {
+    print("  Object m${i}(Object o) => m${i - 1}(o);");
+  }
+  print("""}
+
+void main() {
+  final x = A().m${N - 1}(10);
+  Expect.equals(10, x);
+}
+""");
+}
+ */
+
+import 'package:expect/expect.dart';
+
+class A {
+  Object m0(Object o) => o;
+  Object m1(Object o) => m0(o);
+  Object m2(Object o) => m1(o);
+  Object m3(Object o) => m2(o);
+  Object m4(Object o) => m3(o);
+  Object m5(Object o) => m4(o);
+  Object m6(Object o) => m5(o);
+  Object m7(Object o) => m6(o);
+  Object m8(Object o) => m7(o);
+  Object m9(Object o) => m8(o);
+  Object m10(Object o) => m9(o);
+  Object m11(Object o) => m10(o);
+  Object m12(Object o) => m11(o);
+  Object m13(Object o) => m12(o);
+  Object m14(Object o) => m13(o);
+  Object m15(Object o) => m14(o);
+  Object m16(Object o) => m15(o);
+  Object m17(Object o) => m16(o);
+  Object m18(Object o) => m17(o);
+  Object m19(Object o) => m18(o);
+  Object m20(Object o) => m19(o);
+  Object m21(Object o) => m20(o);
+  Object m22(Object o) => m21(o);
+  Object m23(Object o) => m22(o);
+  Object m24(Object o) => m23(o);
+  Object m25(Object o) => m24(o);
+  Object m26(Object o) => m25(o);
+  Object m27(Object o) => m26(o);
+  Object m28(Object o) => m27(o);
+  Object m29(Object o) => m28(o);
+  Object m30(Object o) => m29(o);
+  Object m31(Object o) => m30(o);
+  Object m32(Object o) => m31(o);
+  Object m33(Object o) => m32(o);
+  Object m34(Object o) => m33(o);
+  Object m35(Object o) => m34(o);
+  Object m36(Object o) => m35(o);
+  Object m37(Object o) => m36(o);
+  Object m38(Object o) => m37(o);
+  Object m39(Object o) => m38(o);
+  Object m40(Object o) => m39(o);
+  Object m41(Object o) => m40(o);
+  Object m42(Object o) => m41(o);
+  Object m43(Object o) => m42(o);
+  Object m44(Object o) => m43(o);
+  Object m45(Object o) => m44(o);
+  Object m46(Object o) => m45(o);
+  Object m47(Object o) => m46(o);
+  Object m48(Object o) => m47(o);
+  Object m49(Object o) => m48(o);
+  Object m50(Object o) => m49(o);
+  Object m51(Object o) => m50(o);
+  Object m52(Object o) => m51(o);
+  Object m53(Object o) => m52(o);
+  Object m54(Object o) => m53(o);
+  Object m55(Object o) => m54(o);
+  Object m56(Object o) => m55(o);
+  Object m57(Object o) => m56(o);
+  Object m58(Object o) => m57(o);
+  Object m59(Object o) => m58(o);
+  Object m60(Object o) => m59(o);
+  Object m61(Object o) => m60(o);
+  Object m62(Object o) => m61(o);
+  Object m63(Object o) => m62(o);
+  Object m64(Object o) => m63(o);
+  Object m65(Object o) => m64(o);
+  Object m66(Object o) => m65(o);
+  Object m67(Object o) => m66(o);
+  Object m68(Object o) => m67(o);
+  Object m69(Object o) => m68(o);
+  Object m70(Object o) => m69(o);
+  Object m71(Object o) => m70(o);
+  Object m72(Object o) => m71(o);
+  Object m73(Object o) => m72(o);
+  Object m74(Object o) => m73(o);
+  Object m75(Object o) => m74(o);
+  Object m76(Object o) => m75(o);
+  Object m77(Object o) => m76(o);
+  Object m78(Object o) => m77(o);
+  Object m79(Object o) => m78(o);
+  Object m80(Object o) => m79(o);
+  Object m81(Object o) => m80(o);
+  Object m82(Object o) => m81(o);
+  Object m83(Object o) => m82(o);
+  Object m84(Object o) => m83(o);
+  Object m85(Object o) => m84(o);
+  Object m86(Object o) => m85(o);
+  Object m87(Object o) => m86(o);
+  Object m88(Object o) => m87(o);
+  Object m89(Object o) => m88(o);
+  Object m90(Object o) => m89(o);
+  Object m91(Object o) => m90(o);
+  Object m92(Object o) => m91(o);
+  Object m93(Object o) => m92(o);
+  Object m94(Object o) => m93(o);
+  Object m95(Object o) => m94(o);
+  Object m96(Object o) => m95(o);
+  Object m97(Object o) => m96(o);
+  Object m98(Object o) => m97(o);
+  Object m99(Object o) => m98(o);
+  Object m100(Object o) => m99(o);
+  Object m101(Object o) => m100(o);
+  Object m102(Object o) => m101(o);
+  Object m103(Object o) => m102(o);
+  Object m104(Object o) => m103(o);
+  Object m105(Object o) => m104(o);
+  Object m106(Object o) => m105(o);
+  Object m107(Object o) => m106(o);
+  Object m108(Object o) => m107(o);
+  Object m109(Object o) => m108(o);
+  Object m110(Object o) => m109(o);
+  Object m111(Object o) => m110(o);
+  Object m112(Object o) => m111(o);
+  Object m113(Object o) => m112(o);
+  Object m114(Object o) => m113(o);
+  Object m115(Object o) => m114(o);
+  Object m116(Object o) => m115(o);
+  Object m117(Object o) => m116(o);
+  Object m118(Object o) => m117(o);
+  Object m119(Object o) => m118(o);
+  Object m120(Object o) => m119(o);
+  Object m121(Object o) => m120(o);
+  Object m122(Object o) => m121(o);
+  Object m123(Object o) => m122(o);
+  Object m124(Object o) => m123(o);
+  Object m125(Object o) => m124(o);
+  Object m126(Object o) => m125(o);
+  Object m127(Object o) => m126(o);
+  Object m128(Object o) => m127(o);
+  Object m129(Object o) => m128(o);
+  Object m130(Object o) => m129(o);
+  Object m131(Object o) => m130(o);
+  Object m132(Object o) => m131(o);
+  Object m133(Object o) => m132(o);
+  Object m134(Object o) => m133(o);
+  Object m135(Object o) => m134(o);
+  Object m136(Object o) => m135(o);
+  Object m137(Object o) => m136(o);
+  Object m138(Object o) => m137(o);
+  Object m139(Object o) => m138(o);
+  Object m140(Object o) => m139(o);
+  Object m141(Object o) => m140(o);
+  Object m142(Object o) => m141(o);
+  Object m143(Object o) => m142(o);
+  Object m144(Object o) => m143(o);
+  Object m145(Object o) => m144(o);
+  Object m146(Object o) => m145(o);
+  Object m147(Object o) => m146(o);
+  Object m148(Object o) => m147(o);
+  Object m149(Object o) => m148(o);
+  Object m150(Object o) => m149(o);
+  Object m151(Object o) => m150(o);
+  Object m152(Object o) => m151(o);
+  Object m153(Object o) => m152(o);
+  Object m154(Object o) => m153(o);
+  Object m155(Object o) => m154(o);
+  Object m156(Object o) => m155(o);
+  Object m157(Object o) => m156(o);
+  Object m158(Object o) => m157(o);
+  Object m159(Object o) => m158(o);
+  Object m160(Object o) => m159(o);
+  Object m161(Object o) => m160(o);
+  Object m162(Object o) => m161(o);
+  Object m163(Object o) => m162(o);
+  Object m164(Object o) => m163(o);
+  Object m165(Object o) => m164(o);
+  Object m166(Object o) => m165(o);
+  Object m167(Object o) => m166(o);
+  Object m168(Object o) => m167(o);
+  Object m169(Object o) => m168(o);
+  Object m170(Object o) => m169(o);
+  Object m171(Object o) => m170(o);
+  Object m172(Object o) => m171(o);
+  Object m173(Object o) => m172(o);
+  Object m174(Object o) => m173(o);
+  Object m175(Object o) => m174(o);
+  Object m176(Object o) => m175(o);
+  Object m177(Object o) => m176(o);
+  Object m178(Object o) => m177(o);
+  Object m179(Object o) => m178(o);
+  Object m180(Object o) => m179(o);
+  Object m181(Object o) => m180(o);
+  Object m182(Object o) => m181(o);
+  Object m183(Object o) => m182(o);
+  Object m184(Object o) => m183(o);
+  Object m185(Object o) => m184(o);
+  Object m186(Object o) => m185(o);
+  Object m187(Object o) => m186(o);
+  Object m188(Object o) => m187(o);
+  Object m189(Object o) => m188(o);
+  Object m190(Object o) => m189(o);
+  Object m191(Object o) => m190(o);
+  Object m192(Object o) => m191(o);
+  Object m193(Object o) => m192(o);
+  Object m194(Object o) => m193(o);
+  Object m195(Object o) => m194(o);
+  Object m196(Object o) => m195(o);
+  Object m197(Object o) => m196(o);
+  Object m198(Object o) => m197(o);
+  Object m199(Object o) => m198(o);
+  Object m200(Object o) => m199(o);
+  Object m201(Object o) => m200(o);
+  Object m202(Object o) => m201(o);
+  Object m203(Object o) => m202(o);
+  Object m204(Object o) => m203(o);
+  Object m205(Object o) => m204(o);
+  Object m206(Object o) => m205(o);
+  Object m207(Object o) => m206(o);
+  Object m208(Object o) => m207(o);
+  Object m209(Object o) => m208(o);
+  Object m210(Object o) => m209(o);
+  Object m211(Object o) => m210(o);
+  Object m212(Object o) => m211(o);
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+  Object m688(Object o) => m687(o);
+  Object m689(Object o) => m688(o);
+  Object m690(Object o) => m689(o);
+  Object m691(Object o) => m690(o);
+  Object m692(Object o) => m691(o);
+  Object m693(Object o) => m692(o);
+  Object m694(Object o) => m693(o);
+  Object m695(Object o) => m694(o);
+  Object m696(Object o) => m695(o);
+  Object m697(Object o) => m696(o);
+  Object m698(Object o) => m697(o);
+  Object m699(Object o) => m698(o);
+  Object m700(Object o) => m699(o);
+  Object m701(Object o) => m700(o);
+  Object m702(Object o) => m701(o);
+  Object m703(Object o) => m702(o);
+  Object m704(Object o) => m703(o);
+  Object m705(Object o) => m704(o);
+  Object m706(Object o) => m705(o);
+  Object m707(Object o) => m706(o);
+  Object m708(Object o) => m707(o);
+  Object m709(Object o) => m708(o);
+  Object m710(Object o) => m709(o);
+  Object m711(Object o) => m710(o);
+  Object m712(Object o) => m711(o);
+  Object m713(Object o) => m712(o);
+  Object m714(Object o) => m713(o);
+  Object m715(Object o) => m714(o);
+  Object m716(Object o) => m715(o);
+  Object m717(Object o) => m716(o);
+  Object m718(Object o) => m717(o);
+  Object m719(Object o) => m718(o);
+  Object m720(Object o) => m719(o);
+  Object m721(Object o) => m720(o);
+  Object m722(Object o) => m721(o);
+  Object m723(Object o) => m722(o);
+  Object m724(Object o) => m723(o);
+  Object m725(Object o) => m724(o);
+  Object m726(Object o) => m725(o);
+  Object m727(Object o) => m726(o);
+  Object m728(Object o) => m727(o);
+  Object m729(Object o) => m728(o);
+  Object m730(Object o) => m729(o);
+  Object m731(Object o) => m730(o);
+  Object m732(Object o) => m731(o);
+  Object m733(Object o) => m732(o);
+  Object m734(Object o) => m733(o);
+  Object m735(Object o) => m734(o);
+  Object m736(Object o) => m735(o);
+  Object m737(Object o) => m736(o);
+  Object m738(Object o) => m737(o);
+  Object m739(Object o) => m738(o);
+  Object m740(Object o) => m739(o);
+  Object m741(Object o) => m740(o);
+  Object m742(Object o) => m741(o);
+  Object m743(Object o) => m742(o);
+  Object m744(Object o) => m743(o);
+  Object m745(Object o) => m744(o);
+  Object m746(Object o) => m745(o);
+  Object m747(Object o) => m746(o);
+  Object m748(Object o) => m747(o);
+  Object m749(Object o) => m748(o);
+  Object m750(Object o) => m749(o);
+  Object m751(Object o) => m750(o);
+  Object m752(Object o) => m751(o);
+  Object m753(Object o) => m752(o);
+  Object m754(Object o) => m753(o);
+  Object m755(Object o) => m754(o);
+  Object m756(Object o) => m755(o);
+  Object m757(Object o) => m756(o);
+  Object m758(Object o) => m757(o);
+  Object m759(Object o) => m758(o);
+  Object m760(Object o) => m759(o);
+  Object m761(Object o) => m760(o);
+  Object m762(Object o) => m761(o);
+  Object m763(Object o) => m762(o);
+  Object m764(Object o) => m763(o);
+  Object m765(Object o) => m764(o);
+  Object m766(Object o) => m765(o);
+  Object m767(Object o) => m766(o);
+  Object m768(Object o) => m767(o);
+  Object m769(Object o) => m768(o);
+  Object m770(Object o) => m769(o);
+  Object m771(Object o) => m770(o);
+  Object m772(Object o) => m771(o);
+  Object m773(Object o) => m772(o);
+  Object m774(Object o) => m773(o);
+  Object m775(Object o) => m774(o);
+  Object m776(Object o) => m775(o);
+  Object m777(Object o) => m776(o);
+  Object m778(Object o) => m777(o);
+  Object m779(Object o) => m778(o);
+  Object m780(Object o) => m779(o);
+  Object m781(Object o) => m780(o);
+  Object m782(Object o) => m781(o);
+  Object m783(Object o) => m782(o);
+  Object m784(Object o) => m783(o);
+  Object m785(Object o) => m784(o);
+  Object m786(Object o) => m785(o);
+  Object m787(Object o) => m786(o);
+  Object m788(Object o) => m787(o);
+  Object m789(Object o) => m788(o);
+  Object m790(Object o) => m789(o);
+  Object m791(Object o) => m790(o);
+  Object m792(Object o) => m791(o);
+  Object m793(Object o) => m792(o);
+  Object m794(Object o) => m793(o);
+  Object m795(Object o) => m794(o);
+  Object m796(Object o) => m795(o);
+  Object m797(Object o) => m796(o);
+  Object m798(Object o) => m797(o);
+  Object m799(Object o) => m798(o);
+  Object m800(Object o) => m799(o);
+  Object m801(Object o) => m800(o);
+  Object m802(Object o) => m801(o);
+  Object m803(Object o) => m802(o);
+  Object m804(Object o) => m803(o);
+  Object m805(Object o) => m804(o);
+  Object m806(Object o) => m805(o);
+  Object m807(Object o) => m806(o);
+  Object m808(Object o) => m807(o);
+  Object m809(Object o) => m808(o);
+  Object m810(Object o) => m809(o);
+  Object m811(Object o) => m810(o);
+  Object m812(Object o) => m811(o);
+  Object m813(Object o) => m812(o);
+  Object m814(Object o) => m813(o);
+  Object m815(Object o) => m814(o);
+  Object m816(Object o) => m815(o);
+  Object m817(Object o) => m816(o);
+  Object m818(Object o) => m817(o);
+  Object m819(Object o) => m818(o);
+  Object m820(Object o) => m819(o);
+  Object m821(Object o) => m820(o);
+  Object m822(Object o) => m821(o);
+  Object m823(Object o) => m822(o);
+  Object m824(Object o) => m823(o);
+  Object m825(Object o) => m824(o);
+  Object m826(Object o) => m825(o);
+  Object m827(Object o) => m826(o);
+  Object m828(Object o) => m827(o);
+  Object m829(Object o) => m828(o);
+  Object m830(Object o) => m829(o);
+  Object m831(Object o) => m830(o);
+  Object m832(Object o) => m831(o);
+  Object m833(Object o) => m832(o);
+  Object m834(Object o) => m833(o);
+  Object m835(Object o) => m834(o);
+  Object m836(Object o) => m835(o);
+  Object m837(Object o) => m836(o);
+  Object m838(Object o) => m837(o);
+  Object m839(Object o) => m838(o);
+  Object m840(Object o) => m839(o);
+  Object m841(Object o) => m840(o);
+  Object m842(Object o) => m841(o);
+  Object m843(Object o) => m842(o);
+  Object m844(Object o) => m843(o);
+  Object m845(Object o) => m844(o);
+  Object m846(Object o) => m845(o);
+  Object m847(Object o) => m846(o);
+  Object m848(Object o) => m847(o);
+  Object m849(Object o) => m848(o);
+  Object m850(Object o) => m849(o);
+  Object m851(Object o) => m850(o);
+  Object m852(Object o) => m851(o);
+  Object m853(Object o) => m852(o);
+  Object m854(Object o) => m853(o);
+  Object m855(Object o) => m854(o);
+  Object m856(Object o) => m855(o);
+  Object m857(Object o) => m856(o);
+  Object m858(Object o) => m857(o);
+  Object m859(Object o) => m858(o);
+  Object m860(Object o) => m859(o);
+  Object m861(Object o) => m860(o);
+  Object m862(Object o) => m861(o);
+  Object m863(Object o) => m862(o);
+  Object m864(Object o) => m863(o);
+  Object m865(Object o) => m864(o);
+  Object m866(Object o) => m865(o);
+  Object m867(Object o) => m866(o);
+  Object m868(Object o) => m867(o);
+  Object m869(Object o) => m868(o);
+  Object m870(Object o) => m869(o);
+  Object m871(Object o) => m870(o);
+  Object m872(Object o) => m871(o);
+  Object m873(Object o) => m872(o);
+  Object m874(Object o) => m873(o);
+  Object m875(Object o) => m874(o);
+  Object m876(Object o) => m875(o);
+  Object m877(Object o) => m876(o);
+  Object m878(Object o) => m877(o);
+  Object m879(Object o) => m878(o);
+  Object m880(Object o) => m879(o);
+  Object m881(Object o) => m880(o);
+  Object m882(Object o) => m881(o);
+  Object m883(Object o) => m882(o);
+  Object m884(Object o) => m883(o);
+  Object m885(Object o) => m884(o);
+  Object m886(Object o) => m885(o);
+  Object m887(Object o) => m886(o);
+  Object m888(Object o) => m887(o);
+  Object m889(Object o) => m888(o);
+  Object m890(Object o) => m889(o);
+  Object m891(Object o) => m890(o);
+  Object m892(Object o) => m891(o);
+  Object m893(Object o) => m892(o);
+  Object m894(Object o) => m893(o);
+  Object m895(Object o) => m894(o);
+  Object m896(Object o) => m895(o);
+  Object m897(Object o) => m896(o);
+  Object m898(Object o) => m897(o);
+  Object m899(Object o) => m898(o);
+  Object m900(Object o) => m899(o);
+  Object m901(Object o) => m900(o);
+  Object m902(Object o) => m901(o);
+  Object m903(Object o) => m902(o);
+  Object m904(Object o) => m903(o);
+  Object m905(Object o) => m904(o);
+  Object m906(Object o) => m905(o);
+  Object m907(Object o) => m906(o);
+  Object m908(Object o) => m907(o);
+  Object m909(Object o) => m908(o);
+  Object m910(Object o) => m909(o);
+  Object m911(Object o) => m910(o);
+  Object m912(Object o) => m911(o);
+  Object m913(Object o) => m912(o);
+  Object m914(Object o) => m913(o);
+  Object m915(Object o) => m914(o);
+  Object m916(Object o) => m915(o);
+  Object m917(Object o) => m916(o);
+  Object m918(Object o) => m917(o);
+  Object m919(Object o) => m918(o);
+  Object m920(Object o) => m919(o);
+  Object m921(Object o) => m920(o);
+  Object m922(Object o) => m921(o);
+  Object m923(Object o) => m922(o);
+  Object m924(Object o) => m923(o);
+  Object m925(Object o) => m924(o);
+  Object m926(Object o) => m925(o);
+  Object m927(Object o) => m926(o);
+  Object m928(Object o) => m927(o);
+  Object m929(Object o) => m928(o);
+  Object m930(Object o) => m929(o);
+  Object m931(Object o) => m930(o);
+  Object m932(Object o) => m931(o);
+  Object m933(Object o) => m932(o);
+  Object m934(Object o) => m933(o);
+  Object m935(Object o) => m934(o);
+  Object m936(Object o) => m935(o);
+  Object m937(Object o) => m936(o);
+  Object m938(Object o) => m937(o);
+  Object m939(Object o) => m938(o);
+  Object m940(Object o) => m939(o);
+  Object m941(Object o) => m940(o);
+  Object m942(Object o) => m941(o);
+  Object m943(Object o) => m942(o);
+  Object m944(Object o) => m943(o);
+  Object m945(Object o) => m944(o);
+  Object m946(Object o) => m945(o);
+  Object m947(Object o) => m946(o);
+  Object m948(Object o) => m947(o);
+  Object m949(Object o) => m948(o);
+  Object m950(Object o) => m949(o);
+  Object m951(Object o) => m950(o);
+  Object m952(Object o) => m951(o);
+  Object m953(Object o) => m952(o);
+  Object m954(Object o) => m953(o);
+  Object m955(Object o) => m954(o);
+  Object m956(Object o) => m955(o);
+  Object m957(Object o) => m956(o);
+  Object m958(Object o) => m957(o);
+  Object m959(Object o) => m958(o);
+  Object m960(Object o) => m959(o);
+  Object m961(Object o) => m960(o);
+  Object m962(Object o) => m961(o);
+  Object m963(Object o) => m962(o);
+  Object m964(Object o) => m963(o);
+  Object m965(Object o) => m964(o);
+  Object m966(Object o) => m965(o);
+  Object m967(Object o) => m966(o);
+  Object m968(Object o) => m967(o);
+  Object m969(Object o) => m968(o);
+  Object m970(Object o) => m969(o);
+  Object m971(Object o) => m970(o);
+  Object m972(Object o) => m971(o);
+  Object m973(Object o) => m972(o);
+  Object m974(Object o) => m973(o);
+  Object m975(Object o) => m974(o);
+  Object m976(Object o) => m975(o);
+  Object m977(Object o) => m976(o);
+  Object m978(Object o) => m977(o);
+  Object m979(Object o) => m978(o);
+  Object m980(Object o) => m979(o);
+  Object m981(Object o) => m980(o);
+  Object m982(Object o) => m981(o);
+  Object m983(Object o) => m982(o);
+  Object m984(Object o) => m983(o);
+  Object m985(Object o) => m984(o);
+  Object m986(Object o) => m985(o);
+  Object m987(Object o) => m986(o);
+  Object m988(Object o) => m987(o);
+  Object m989(Object o) => m988(o);
+  Object m990(Object o) => m989(o);
+  Object m991(Object o) => m990(o);
+  Object m992(Object o) => m991(o);
+  Object m993(Object o) => m992(o);
+  Object m994(Object o) => m993(o);
+  Object m995(Object o) => m994(o);
+  Object m996(Object o) => m995(o);
+  Object m997(Object o) => m996(o);
+  Object m998(Object o) => m997(o);
+  Object m999(Object o) => m998(o);
+}
+
+void main() {
+  final x = A().m999(10);
+  Expect.equals(10, x);
+}

runtime/vm/compiler/backend/type_propagator.cc

diff --git a/runtime/vm/compiler/backend/type_propagator.cc b/runtime/vm/compiler/backend/type_propagator.cc
index 8d2bb7a..1ef08d4 100644
--- a/runtime/vm/compiler/backend/type_propagator.cc
+++ b/runtime/vm/compiler/backend/type_propagator.cc
@@ -761,8 +761,7 @@
   if (type_ == NULL) {
     // Type propagation has not run. Return dynamic-type.
     if (cid_ == kIllegalCid) {
-      type_ = &Object::dynamic_type();
-      return type_;
+      return &Object::dynamic_type();
     }
 
     // VM-internal objects don't have a compile-type. Return dynamic-type

tools/VERSION

diff --git a/tools/VERSION b/tools/VERSION
index e82a19b..ddf8dc5 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -32,7 +32,7 @@
 CHANNEL stable
 MAJOR 2
 MINOR 9
-PATCH 1
+PATCH 2
 PRERELEASE 0
 PRERELEASE_PATCH 0
 ABI_VERSION 38