swiftwasm · MaxDesiatov · Apr 15, 2020 · Oct 19, 2018 · Nov 22, 2019 · Mar 2, 2020
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -893,7 +893,13 @@ if(NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin")
 endif()
 
 find_package(Python2 COMPONENTS Interpreter REQUIRED)
-find_package(Python3 COMPONENTS Interpreter REQUIRED)
+find_package(Python3 COMPONENTS Interpreter)
+if(NOT Python3_Interpreter_FOUND)
+  message(WARNING "Python3 not found, using python2 as a fallback")
+  add_executable(Python3::Interpreter IMPORTED)
+  set_target_properties(Python3::Interpreter PROPERTIES
+    IMPORTED_LOCATION ${Python2_EXECUTABLE})
+endif()
 
 #
 # Find optional dependencies.

diff --git a/benchmark/CMakeLists.txt b/benchmark/CMakeLists.txt
@@ -96,8 +96,7 @@ set(SWIFT_BENCH_MODULES
     single-source/Hanoi
     single-source/Hash
     single-source/Histogram
-    single-source/InsertCharacter  
-    single-source/IntegerParsing
+    single-source/HTTP2StateMachine
     single-source/Integrate
     single-source/IterateData
     single-source/Join

diff --git a/benchmark/Package.swift b/benchmark/Package.swift
@@ -22,19 +22,19 @@ func getSingleSourceLibraries(subDirectory: String) -> [String] {
   let fileURLs = try! f.contentsOfDirectory(at: dirURL,
                                             includingPropertiesForKeys: nil)
   return fileURLs.compactMap { (path: URL) -> String? in
-    let c = path.lastPathComponent.split(separator: ".")
-    // Too many components. Must be a gyb file.
-    if c.count > 2 {
-      return nil
-    }
-    if c[1] != "swift" {
+    guard let lastDot = path.lastPathComponent.lastIndex(of: ".") else {
       return nil
     }
+    let ext = String(path.lastPathComponent.suffix(from: lastDot))
+    guard ext == ".swift" else { return nil }
+
+    let name = String(path.lastPathComponent.prefix(upTo: lastDot))
 
-    let name = String(c[0])
+    // Test names must have a single component.
+    if name.contains(".") { return nil }
 
-    // We do not support this test.
     if unsupportedTests.contains(name) {
+      // We do not support this test.
       return nil
     }
 

diff --git a/benchmark/single-source/HTTP2StateMachine.swift b/benchmark/single-source/HTTP2StateMachine.swift
diff --git a/benchmark/utils/main.swift b/benchmark/utils/main.swift
@@ -84,8 +84,7 @@ import FloatingPointPrinting
 import Hanoi
 import Hash
 import Histogram
-import InsertCharacter
-import IntegerParsing
+import HTTP2StateMachine
 import Integrate
 import IterateData
 import Join
@@ -268,8 +267,7 @@ registerBenchmark(FloatingPointPrinting)
 registerBenchmark(Hanoi)
 registerBenchmark(HashTest)
 registerBenchmark(Histogram)
-registerBenchmark(InsertCharacter)
-registerBenchmark(IntegerParsing)
+registerBenchmark(HTTP2StateMachine)
 registerBenchmark(IntegrateTest)
 registerBenchmark(IterateData)
 registerBenchmark(Join)

diff --git a/docs/ContinuousIntegration.md b/docs/ContinuousIntegration.md
@@ -12,6 +12,7 @@
     - [Source Compatibility Testing](#source-compatibility-testing)
     - [Sourcekit Stress Testing](#sourcekit-stress-testing)
     - [Specific Preset Testing](#specific-preset-testing)
+    - [Running Non-Executable Device Tests](#running-non-executable-device-tests)
     - [Build Swift Toolchain](#build-swift-toolchain)
     - [Testing Compiler Performance](#testing-compiler-performance)
     - [Swift Community Hosted CI Pull Request Testing](#swift-community-hosted-ci-pull-request-testing)
@@ -161,8 +162,18 @@ For example:
 ```
 preset=buildbot_incremental,tools=RA,stdlib=RD,smoketest=macosx,single-thread
 @swift-ci Please test with preset macOS
+```
+
+### Running Non-Executable Device Tests
+
+Using the specific preset testing, one can run non-executable device tests by
+telling swift-ci:
 
 ```
+preset=buildbot,tools=RA,stdlib=RD,test=non_executable
+@swift-ci Please test with preset macOS
+```
+
 ### Build Swift Toolchain
 
 Platform       | Comment | Check Status

diff --git a/docs/DebuggingTheCompiler.rst b/docs/DebuggingTheCompiler.rst
@@ -80,8 +80,8 @@ where to stop in the debugger. Rather than trying to guess/check if one has an
 asserts swift compiler, one can use the following options to cause the
 diagnostic engine to assert on the first error/warning:
 
-* -Xllvm -swift-diagnostics-assert-on-error=1
-* -Xllvm -swift-diagnostics-assert-on-warning=1
+* ``-Xllvm -swift-diagnostics-assert-on-error=1``
+* ``-Xllvm -swift-diagnostics-assert-on-warning=1``
 
 These allow one to dump a stack trace of where the diagnostic is being emitted
 (if run without a debugger) or drop into the debugger if a debugger is attached.
@@ -548,10 +548,17 @@ it's quite easy to do this manually:
 
   a. Add the compiler option ``-Xllvm -sil-opt-pass-count=<n>``, where ``<n>``
      is the number of optimizations to run.
-  b. Bisect: find n where the executable crashes, but does not crash with n-1.
-     Note that n can be quite large, e.g. > 100000 (just try
-     n = 10, 100, 1000, 10000, etc. to find an upper bound).
-  c. Add another option ``-Xllvm -sil-print-pass-name``. The output can be
+
+  b. Bisect: find n where the executable crashes, but does not crash
+     with n-1. First just try n = 10, 100, 1000, 10000, etc. to find
+     an upper bound). Then can either bisect the invocation by hand or
+     place the invocation into a script and use
+     ``./llvm-project/llvm/utils/bisect`` to automatically bisect
+     based on the scripts error code. Example invocation::
+
+       bisect --start=0 --end=10000 ./invoke_swift_passing_N.sh "%(count)s"
+
+  c. Once one finds ``n``, Add another option ``-Xllvm -sil-print-pass-name``. The output can be
      large, so it's best to redirect stderr to a file (``2> output``).
      In the output search for the last pass before ``stage Address Lowering``.
      It should be the ``Run #<n-1>``. This line tells you the name of the bad
@@ -687,3 +694,65 @@ Multiple Logs at a Time
 Note, you can also turn on more than one log at a time as well, e.x.::
 
     (lldb) log enable -f /tmp/lldb-types-log.txt lldb types expression
+
+Using git-bisect in the presence of branch forwarding/feature branches
+======================================================================
+
+``git-bisect`` is a useful tool for finding where a regression was
+introduced. Sadly ``git-bisect`` does not handle long lived branches
+and will in fact choose commits from upstream branches that may be
+missing important content from the downstream branch. As an example,
+consider a situation where one has the following straw man commit flow
+graph::
+
+    github/master -> github/tensorflow
+
+In this case if one attempts to use ``git-bisect`` on
+github/tensorflow, ``git-bisect`` will sometimes choose commits from
+github/master resulting in one being unable to compile/test specific
+tensorflow code that has not been upstreamed yet. Even worse, what if
+we are trying to bisect in between two that were branched from
+github/tensorflow and have had subsequent commits cherry-picked on
+top. Without any loss of generality, lets call those two tags
+``tag-tensorflow-bad`` and ``tag-tensorflow-good``. Since both of
+these tags have had commits cherry-picked on top, they are technically
+not even on the github/tensorflow branch, but rather in a certain
+sense are a tag of a feature branch from master/tensorflow. So,
+``git-bisect`` doesn't even have a clear history to bisect on in
+multiple ways.
+
+With those constraints in mind, we can bisect! We just need to be
+careful how we do it. Lets assume that we have a test script called
+``test.sh`` that indicates error by the error code. With that in hand,
+we need to compute the least common ancestor of the good/bad
+commits. This is traditionally called the "merge base" of the
+commits. We can compute this as so::
+
+    TAG_MERGE_BASE=$(git merge-base tags/tag-tensorflow-bad tags/tag-tensorflow-good)
+
+Given that both tags were taken from the feature branch, the reader
+can prove to themselves that this commit is guaranteed to be on
+``github/tensorflow`` and not ``github/master`` since all commits from
+``github/master`` are forwarded using git merges.
+
+Then lets assume that we checked out ``$TAG_MERGE_BASE`` and then ran
+``test.sh`` and did not hit any error. Ok, we can not bisect. Sadly,
+as mentioned above if we run git-bisect in between ``$TAG_MERGE_BASE``
+and ``tags/tag-tensorflow-bad``, ``git-bisect`` will sometimes choose
+commits from ``github/master`` which would cause ``test.sh`` to fail
+if we are testing tensorflow specific code! To work around this
+problem, we need to start our bisect and then tell ``git-bisect`` to
+ignore those commits by using the skip sub command::
+
+    git bisect start tags/tag-tensorflow-bad $TAG_MERGE_BASE
+    for rev in $(git rev-list $TAG_MERGE_BASE..tags/tag-tensorflow-bad --merges --first-parent); do
+        git rev-list $rev^2 --not $rev^
+    done | xargs git bisect skip
+
+Once this has been done, one uses ``git-bisect`` normally. One thing
+to be aware of is that ``git-bisect`` will return a good/bad commits
+on the feature branch and if one of those commits is a merge from the
+upstream branch, one will need to analyze the range of commits from
+upstream for the bad commit afterwards. The commit range in the merge
+should be relatively small though compared with the large git history
+one just bisected.
diff --git a/include/swift/AST/Decl.h b/include/swift/AST/Decl.h
@@ -5243,7 +5243,7 @@ class VarDecl : public AbstractStorageDecl {
   ///
   /// \code
   /// @Lazy var i = 17
-  /// \end
+  /// \endcode
   ///
   /// Or when there is no initializer but each composed property wrapper has
   /// a suitable `init(wrappedValue:)`.

diff --git a/include/swift/AST/DiagnosticsSema.def b/include/swift/AST/DiagnosticsSema.def
@@ -902,8 +902,8 @@ ERROR(nonstatic_operator_in_nominal,none,
       "operator %0 declared in type %1 must be 'static'",
       (Identifier, DeclName))
 ERROR(nonstatic_operator_in_extension,none,
-      "operator %0 declared in extension of %1 must be 'static'",
-      (Identifier, TypeRepr*))
+      "operator %0 declared in extension%select{| of %2}1 must be 'static'",
+      (Identifier, bool, TypeRepr*))
 ERROR(nonfinal_operator_in_class,none,
       "operator %0 declared in non-final class %1 must be 'final'",
       (Identifier, Type))

diff --git a/include/swift/AST/Expr.h b/include/swift/AST/Expr.h
@@ -4041,7 +4041,61 @@ class OpaqueValueExpr : public Expr {
   SourceRange getSourceRange() const { return Range; }
 
   static bool classof(const Expr *E) {
-    return E->getKind() == ExprKind::OpaqueValue; 
+    return E->getKind() == ExprKind::OpaqueValue;
+  }
+};
+
+/// A placeholder to substitute with a \c wrappedValue initialization expression
+/// for a property with an attached property wrapper.
+///
+/// Wrapped value placeholder expressions are injected around the
+/// \c wrappedValue argument in a synthesized \c init(wrappedValue:)
+/// call. This injection happens for properties with attached property wrappers
+/// that can be initialized out-of-line with a wrapped value expression, rather
+/// than calling \c init(wrappedValue:) explicitly.
+///
+/// Wrapped value placeholders store the original initialization expression
+/// if one exists, along with an opaque value placeholder that can be bound
+/// to a different wrapped value expression.
+class PropertyWrapperValuePlaceholderExpr : public Expr {
+  SourceRange Range;
+  OpaqueValueExpr *Placeholder;
+  Expr *WrappedValue;
+
+  PropertyWrapperValuePlaceholderExpr(SourceRange Range, Type Ty,
+                                      OpaqueValueExpr *placeholder,
+                                      Expr *wrappedValue)
+      : Expr(ExprKind::PropertyWrapperValuePlaceholder, /*Implicit=*/true, Ty),
+        Range(Range), Placeholder(placeholder), WrappedValue(wrappedValue) {}
+
+public:
+  static PropertyWrapperValuePlaceholderExpr *
+  create(ASTContext &ctx, SourceRange range, Type ty, Expr *wrappedValue);
+
+  /// The original wrappedValue initialization expression provided via
+  /// \c = on a proprety with attached property wrappers.
+  Expr *getOriginalWrappedValue() const {
+    return WrappedValue;
+  }
+
+  void setOriginalWrappedValue(Expr *value) {
+    WrappedValue = value;
+  }
+
+  /// An opaque value placeholder that will be used to substitute in a
+  /// different wrapped value expression for out-of-line initialization.
+  OpaqueValueExpr *getOpaqueValuePlaceholder() const {
+    return Placeholder;
+  }
+
+  void setOpaqueValuePlaceholder(OpaqueValueExpr *placeholder) {
+    Placeholder = placeholder;
+  }
+
+  SourceRange getSourceRange() const { return Range; }
+
+  static bool classof(const Expr *E) {
+    return E->getKind() == ExprKind::PropertyWrapperValuePlaceholder;
   }
 };
 

diff --git a/include/swift/AST/ExprNodes.def b/include/swift/AST/ExprNodes.def
@@ -126,6 +126,7 @@ EXPR(VarargExpansion, Expr)
 EXPR(DynamicType, Expr)
 EXPR(RebindSelfInConstructor, Expr)
 EXPR(OpaqueValue, Expr)
+EXPR(PropertyWrapperValuePlaceholder, Expr)
 EXPR(DefaultArgument, Expr)
 EXPR(BindOptional, Expr)
 EXPR(OptionalEvaluation, Expr)

diff --git a/include/swift/AST/PropertyWrappers.h b/include/swift/AST/PropertyWrappers.h
@@ -141,7 +141,7 @@ struct PropertyWrapperBackingPropertyInfo {
   ///
   /// \code
   /// @Lazy var i = 17
-  /// \end
+  /// \endcode
   ///
   /// This is the specified initial value (\c 17), which is suitable for
   /// embedding in the expression \c initializeFromOriginal.
@@ -190,12 +190,13 @@ void simple_display(
     llvm::raw_ostream &out,
     const PropertyWrapperBackingPropertyInfo &backingInfo);
 
-/// Given the initializer for the given property with an attached property
-/// wrapper, dig out the original initialization expression.
+/// Given the initializer for a property with an attached property wrapper,
+/// dig out the wrapped value placeholder for the original initialization
+/// expression.
 ///
-/// Cannot just dig out the getOriginalInit() value because this function checks
-/// types, etc. Erroneous code won't return a result from here.
-Expr *findOriginalPropertyWrapperInitialValue(VarDecl *var, Expr *init);
+/// \note The wrapped value placeholder is injected for properties that can
+/// be initialized out-of-line using an expression of the wrapped property type.
+PropertyWrapperValuePlaceholderExpr *findWrappedValuePlaceholder(Expr *init);
 
 } // end namespace swift
 

diff --git a/lib/AST/ASTDumper.cpp b/lib/AST/ASTDumper.cpp
@@ -2511,6 +2511,18 @@ class PrintExpr : public ExprVisitor<PrintExpr> {
     PrintWithColorRAII(OS, ParenthesisColor) << ')';
   }
 
+  void visitPropertyWrapperValuePlaceholderExpr(
+      PropertyWrapperValuePlaceholderExpr *E) {
+    printCommon(E, "property_wrapper_value_placeholder_expr");
+    OS << '\n';
+    printRec(E->getOpaqueValuePlaceholder());
+    if (auto *value = E->getOriginalWrappedValue()) {
+      OS << '\n';
+      printRec(value);
+    }
+    PrintWithColorRAII(OS, ParenthesisColor) << ')';
+  }
+
   void visitDefaultArgumentExpr(DefaultArgumentExpr *E) {
     printCommon(E, "default_argument_expr");
     OS << " default_args_owner=";

diff --git a/lib/AST/ASTWalker.cpp b/lib/AST/ASTWalker.cpp
@@ -508,6 +508,23 @@ class Traversal : public ASTVisitor<Traversal, Expr*, Stmt*,
 
   Expr *visitOpaqueValueExpr(OpaqueValueExpr *E) { return E; }
 
+  Expr *visitPropertyWrapperValuePlaceholderExpr(
+      PropertyWrapperValuePlaceholderExpr *E) {
+    if (auto *placeholder = doIt(E->getOpaqueValuePlaceholder()))
+      E->setOpaqueValuePlaceholder(dyn_cast<OpaqueValueExpr>(placeholder));
+    else
+      return nullptr;
+
+    if (E->getOriginalWrappedValue()) {
+      if (auto *newValue = doIt(E->getOriginalWrappedValue()))
+        E->setOriginalWrappedValue(newValue);
+      else
+        return nullptr;
+    }
+
+    return E;
+  }
+
   Expr *visitDefaultArgumentExpr(DefaultArgumentExpr *E) { return E; }
 
   Expr *visitInterpolatedStringLiteralExpr(InterpolatedStringLiteralExpr *E) {