[SourceKit/Refactoring] Macro expansion

Add refactoring "Expand Macro" that expands macro expressions.

rdar://102739026

include/swift/Refactoring/RefactoringKinds.def

@@ -64,6 +64,8 @@ CURSOR_REFACTORING(AddAsyncAlternative, "Add Async Alternative", add.async-alter
 
 CURSOR_REFACTORING(AddAsyncWrapper, "Add Async Wrapper", add.async-wrapper)
 
+CURSOR_REFACTORING(ExpandMacro, "Expand Macro", expand.macro)
+
 RANGE_REFACTORING(ExtractExpr, "Extract Expression", extract.expr)
 
 RANGE_REFACTORING(ExtractFunction, "Extract Method", extract.function)

lib/IDE/SourceEntityWalker.cpp

@@ -607,10 +607,7 @@ ASTWalker::PreWalkResult<Expr *> SemaAnnotator::walkToExprPre(Expr *E) {
         return Action::Stop();
     }
 
-    if (auto rewritten = ME->getRewritten()) {
-      if (!rewritten->walk(*this))
-        return Action::Stop();
-    }
+    // Do not walk into ME->getRewritten() because it's not what the user wrote.
 
     // Already walked the children.
     return doSkipChildren();

lib/Refactoring/Refactoring.cpp

@@ -8421,6 +8421,62 @@ bool RefactoringActionAddAsyncWrapper::performChange() {
   return false;
 }
 
+static MacroExpansionExpr *
+findMacroExpansionTargetExpr(const ResolvedCursorInfo &Info) {
+
+  // Handle '#' position in '#macroName(...)'.
+  if (auto exprInfo = dyn_cast<ResolvedExprStartCursorInfo>(&Info)) {
+    if (auto target =
+            dyn_cast_or_null<MacroExpansionExpr>(exprInfo->getTrailingExpr()))
+      if (target->getRewritten())
+        return target;
+    return nullptr;
+  }
+
+  // Handle 'macroName' position in '#macroName(...)'.
+  if (auto refInfo = dyn_cast<ResolvedValueRefCursorInfo>(&Info)) {
+    if (refInfo->isRef() && isa_and_nonnull<MacroDecl>(refInfo->getValueD())) {
+      ContextFinder Finder(
+          *Info.getSourceFile(), Info.getLoc(), [&](ASTNode N) {
+            auto *expr =
+                dyn_cast_or_null<MacroExpansionExpr>(N.dyn_cast<Expr *>());
+            return expr &&
+                   (expr->getMacroNameLoc().getBaseNameLoc() == Info.getLoc());
+          });
+      Finder.resolve();
+      if (!Finder.getContexts().empty()) {
+        auto *target =
+            dyn_cast<MacroExpansionExpr>(Finder.getContexts()[0].get<Expr *>());
+        if (target->getRewritten())
+          return target;
+      }
+    }
+    return nullptr;
+  }
+
+  // TODO: handle MacroExpansionDecl.
+  return nullptr;
+}
+
+bool RefactoringActionExpandMacro::isApplicable(const ResolvedCursorInfo &Info,
+                                                DiagnosticEngine &Diag) {
+  return findMacroExpansionTargetExpr(Info) != nullptr;
+}
+
+bool RefactoringActionExpandMacro::performChange() {
+  auto target = findMacroExpansionTargetExpr(CursorInfo);
+  if (!target)
+    return true;
+
+  auto exprRange =
+      Lexer::getCharSourceRangeFromSourceRange(SM, target->getSourceRange());
+  auto rewrittenRange = Lexer::getCharSourceRangeFromSourceRange(
+      SM, target->getRewritten()->getSourceRange());
+  auto rewrittenBuffer = SM.extractText(rewrittenRange);
+  EditConsumer.accept(SM, exprRange, rewrittenBuffer);
+  return false;
+}
+
 } // end of anonymous namespace
 
 StringRef swift::ide::

test/Index/index_macros.swift

@@ -22,3 +22,6 @@ func test(x: Int) {
 // CHECK: 11:8 | macro/Swift | myLine | s:14swift_ide_test6myLineSifm | Ref,RelCont | rel: 1
 // CHECK: 12:20 | macro/Swift | myFilename | s:14swift_ide_test10myFilenamexfm | Ref,RelCont | rel: 1
 // CHECK: 13:8 | macro/Swift | myStringify(_:) | s:14swift_ide_test11myStringifyyx_SStxcfm | Ref,RelCont | rel: 1
+// CHECK: 13:20 | param/Swift | x | s:14swift_ide_test0C01xySi_tFACL_Sivp | Ref,Read,RelCont | rel: 1
+// CHECK: 13:22 | static-method/infix-operator/Swift | +(_:_:) | s:Si1poiyS2i_SitFZ | Ref,Call,RelCall,RelCont | rel: 1
+// CHECK: 13:24 | param/Swift | x | s:14swift_ide_test0C01xySi_tFACL_Sivp | Ref,Read,RelCont | rel: 1

test/SourceKit/Macros/macro_basic.swift

@@ -0,0 +1,53 @@
+macro stringify<T>(_ value: T) -> (T, String) = MacroDefinition.StringifyMacro
+
+func testStringify(a: Int, b: Int) {
+  _ = #stringify(a + b)
+}
+
+// FIXME: Swift parser is not enabled on Linux CI yet.
+// REQUIRES: OS=macosx
+
+// REQUIRES=shell
+
+// RUN: %empty-directory(%t)
+
+//##-- Prepare the macro plugin.
+// RUN: %target-build-swift -I %swift-host-lib-dir -L %swift-host-lib-dir -emit-library -o %t/%target-library-name(MacroDefinition) -module-name=MacroDefinition %S/../../Macros/Inputs/syntax_macro_definitions.swift -g -no-toolchain-stdlib-rpath
+
+// RUN: COMPILER_ARGS=( \
+// RUN:   -enable-experimental-feature Macros \
+// RUN:   -load-plugin-library %t/%target-library-name(MacroDefinition) \
+// RUN:   -I %swift-host-lib-dir \
+// RUN:   -module-name MacroUser \
+// RUN:   %s \
+// RUN: )
+
+//##-- cursor-info at '#' position.
+// RUN: %sourcekitd-test -req=cursor -pos=4:7 -cursor-action %s -- ${COMPILER_ARGS[@]} | %FileCheck -check-prefix=CURSOR_POUND %s
+
+// CURSOR_POUND-LABEL: ACTIONS BEGIN
+// CURSOR_POUND: source.refactoring.kind.expand.macro
+// CURSOR_POUND-NEXT: Expand Macro
+// CURSOR_POUND: ACTIONS END
+
+//##-- cursor-info at 'stringify' position.
+// RUN: %sourcekitd-test -req=cursor -pos=4:8 -cursor-action %s -- ${COMPILER_ARGS[@]} | %FileCheck -check-prefix=CURSOR_MACRONAME %s
+
+// CURSOR_MACRONAME: source.lang.swift.ref.macro (1:7-1:16)
+// CURSOR_MACRONAME: (T) -> (T, String)
+// CURSOR_MACRONAME: <Declaration>macro stringify&lt;T&gt;(_ value: <Type usr="s:9MacroUser1TL_xmfp">T</Type>) -&gt; (<Type usr="s:9MacroUser1TL_xmfp">T</Type>, <Type usr="s:SS">String</Type>) = MacroDefinition.StringifyMacro</Declaration>
+// CURSOR_MACRONAME: <decl.macro><syntaxtype.keyword>macro</syntaxtype.keyword> <decl.name>stringify</decl.name>&lt;<decl.generic_type_param usr="s:9MacroUser1TL_xmfp"><decl.generic_type_param.name>T</decl.generic_type_param.name></decl.generic_type_param>&gt;(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>value</decl.var.parameter.name>: <decl.var.parameter.type><ref.generic_type_param usr="s:9MacroUser1TL_xmfp">T</ref.generic_type_param></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><tuple>(<tuple.element><tuple.element.type><ref.generic_type_param usr="s:9MacroUser1TL_xmfp">T</ref.generic_type_param></tuple.element.type></tuple.element>, <tuple.element><tuple.element.type><ref.struct usr="s:SS">String</ref.struct></tuple.element.type></tuple.element>)</tuple></decl.function.returntype> = MacroDefinition.StringifyMacro</decl.macro>
+// CURSOR_MACRONAME-LABEL: ACTIONS BEGIN
+// CURSOR_MACRONAME: source.refactoring.kind.rename.global
+// CURSOR_MACRONAME-NEXT: Global Rename
+// CURSOR_MACRONAME: source.refactoring.kind.expand.macro
+// CURSOR_MACRONAME-NEXT: Expand Macro
+// CURSOR_MACRONAME: ACTIONS END
+
+//##-- Refactoring at both position.
+// RUN: %sourcekitd-test -req=refactoring.expand.macro -pos=4:7 %s -- ${COMPILER_ARGS[@]} | %FileCheck -check-prefix=EXPAND %s
+// RUN: %sourcekitd-test -req=refactoring.expand.macro -pos=4:8 %s -- ${COMPILER_ARGS[@]} | %FileCheck -check-prefix=EXPAND %s
+
+// EXPAND: source.edit.kind.active:
+// EXPAND-NEXT: 4:7-4:24 "(a + b, "a + b")"
+

tools/SourceKit/lib/SwiftLang/SwiftLangSupport.cpp

@@ -126,6 +126,7 @@ public:
   UID_FOR(Destructor)
   UID_FOR(Subscript)
   UID_FOR(OpaqueType)
+  UID_FOR(Macro)
 #undef UID_FOR
 };