[ASTGen] Generate anonymous closure parameters

E.g. '$0'

Author: rintaro

include/swift/AST/ASTBridging.h

@@ -243,6 +243,10 @@ SWIFT_NAME("BridgedASTContext.getIdentifier(self:_:)")
 BridgedIdentifier BridgedASTContext_getIdentifier(BridgedASTContext cContext,
                                                   BridgedStringRef cStr);
 
+SWIFT_NAME("BridgedASTContext.getDollarIdentifier(self:_:)")
+BridgedIdentifier
+BridgedASTContext_getDollarIdentifier(BridgedASTContext cContext, size_t idx);
+
 SWIFT_NAME("BridgedASTContext.langOptsHasFeature(self:_:)")
 bool BridgedASTContext_langOptsHasFeature(BridgedASTContext cContext,
                                           BridgedFeature feature);
@@ -552,6 +556,13 @@ SWIFT_NAME("getter:BridgedDeclContext.isModuleScopeContext(self:)")
 BRIDGED_INLINE bool
 BridgedDeclContext_isModuleScopeContext(BridgedDeclContext dc);
 
+SWIFT_NAME("getter:BridgedDeclContext.isClosureExpr(self:)")
+BRIDGED_INLINE bool BridgedDeclContext_isClosureExpr(BridgedDeclContext dc);
+
+SWIFT_NAME("BridgedDeclContext.castToClosureExpr(self:)")
+BRIDGED_INLINE BridgedClosureExpr
+BridgedDeclContext_castToClosureExpr(BridgedDeclContext dc);
+
 SWIFT_NAME("getter:BridgedDeclContext.astContext(self:)")
 BRIDGED_INLINE BridgedASTContext
 BridgedDeclContext_getASTContext(BridgedDeclContext dc);
@@ -1173,6 +1184,9 @@ BRIDGED_INLINE void
 BridgedParamDecl_setSpecifier(BridgedParamDecl cDecl,
                               BridgedParamSpecifier cSpecifier);
 
+SWIFT_NAME("BridgedParamDecl.setImplicit(self:)")
+BRIDGED_INLINE void BridgedParamDecl_setImplicit(BridgedParamDecl cDecl);
+
 SWIFT_NAME("BridgedConstructorDecl.setParsedBody(self:_:)")
 void BridgedConstructorDecl_setParsedBody(BridgedConstructorDecl decl,
                                           BridgedBraceStmt body);
@@ -1575,10 +1589,17 @@ BridgedClosureExpr BridgedClosureExpr_createParsed(
     BridgedSourceLoc cArrowLoc, BridgedNullableTypeRepr cExplicitResultType,
     BridgedSourceLoc cInLoc);
 
+SWIFT_NAME("BridgedClosureExpr.getParameterList(self:)")
+BridgedParameterList
+BridgedClosureExpr_getParameterList(BridgedClosureExpr cClosure);
+
 SWIFT_NAME("BridgedClosureExpr.setParameterList(self:_:)")
 void BridgedClosureExpr_setParameterList(BridgedClosureExpr cClosure,
                                          BridgedParameterList cParams);
 
+SWIFT_NAME("getter:BridgedClosureExpr.hasAnonymousClosureVars(self:)")
+bool BridgedClosureExpr_hasAnonymousClosureVars(BridgedClosureExpr cClosure);
+
 SWIFT_NAME("BridgedClosureExpr.setHasAnonymousClosureVars(self:)")
 void BridgedClosureExpr_setHasAnonymousClosureVars(BridgedClosureExpr cClosure);
 
@@ -2477,6 +2498,13 @@ BridgedParameterList BridgedParameterList_createParsed(
     BridgedASTContext cContext, BridgedSourceLoc cLeftParenLoc,
     BridgedArrayRef cParameters, BridgedSourceLoc cRightParenLoc);
 
+SWIFT_NAME("getter:BridgedParameterList.size(self:)")
+size_t BridgedParameterList_size(BridgedParameterList cParameterList);
+
+SWIFT_NAME("BridgedParameterList.get(self:_:)")
+BridgedParamDecl BridgedParameterList_get(BridgedParameterList cParameterList,
+                                          size_t i);
+
 struct BridgedASTType {
   swift::TypeBase * _Nullable type;
 

include/swift/AST/ASTBridgingImpl.h

@@ -134,6 +134,16 @@ bool BridgedDeclContext_isModuleScopeContext(BridgedDeclContext dc) {
   return dc.unbridged()->isModuleScopeContext();
 }
 
+bool BridgedDeclContext_isClosureExpr(BridgedDeclContext dc) {
+  return llvm::isa_and_present<swift::ClosureExpr>(
+      llvm::dyn_cast<swift::AbstractClosureExpr>(dc.unbridged()));
+}
+
+BridgedClosureExpr BridgedDeclContext_castToClosureExpr(BridgedDeclContext dc) {
+  return llvm::cast<swift::ClosureExpr>(
+      llvm::cast<swift::AbstractClosureExpr>(dc.unbridged()));
+}
+
 BridgedASTContext BridgedDeclContext_getASTContext(BridgedDeclContext dc) {
   return dc.unbridged()->getASTContext();
 }
@@ -270,6 +280,10 @@ void BridgedParamDecl_setSpecifier(BridgedParamDecl cDecl,
   cDecl.unbridged()->setSpecifier(unbridge(cSpecifier));
 }
 
+void BridgedParamDecl_setImplicit(BridgedParamDecl cDecl) {
+  cDecl.unbridged()->setImplicit();
+}
+
 //===----------------------------------------------------------------------===//
 // MARK: BridgedSubscriptDecl
 //===----------------------------------------------------------------------===//

include/swift/AST/ASTContext.h

@@ -598,6 +598,10 @@ class ASTContext final {
   /// specified string.
   Identifier getIdentifier(StringRef Str) const;
 
+  /// getDollarIdentifier - Return the uniqued and AST-Context-owned version of
+  /// anonymous closure parameter (e.g. '$1') name by the index.
+  Identifier getDollarIdentifier(size_t Idx) const;
+
   /// Convert a given alias map to a map of Identifiers between module aliases and their actual names.
   /// For example, if '-module-alias Foo=X -module-alias Bar=Y' input is passed in, the aliases Foo and Bar are
   /// the names of the imported or referenced modules in source files in the main module, and X and Y

lib/AST/ASTContext.cpp

@@ -971,6 +971,12 @@ Identifier ASTContext::getIdentifier(StringRef Str) const {
   return Identifier(I->getKeyData());
 }
 
+Identifier ASTContext::getDollarIdentifier(size_t Idx) const {
+  SmallVector<char, 4> StrBuf;
+  StringRef varName = ("$" + Twine(Idx)).toStringRef(StrBuf);
+  return getIdentifier(varName);
+}
+
 void ASTContext::lookupInModule(
     ModuleDecl *M,
     StringRef name,

lib/AST/Bridging/ASTContextBridging.cpp

@@ -26,6 +26,11 @@ BridgedIdentifier BridgedASTContext_getIdentifier(BridgedASTContext cContext,
   return cContext.unbridged().getIdentifier(cStr.unbridged());
 }
 
+BridgedIdentifier
+BridgedASTContext_getDollarIdentifier(BridgedASTContext cContext, size_t idx) {
+  return cContext.unbridged().getDollarIdentifier(idx);
+}
+
 bool BridgedASTContext_langOptsHasFeature(BridgedASTContext cContext,
                                           BridgedFeature feature) {
   return cContext.unbridged().LangOpts.hasFeature((Feature)feature);

lib/AST/Bridging/DeclBridging.cpp

@@ -728,6 +728,10 @@ bool BridgedNominalTypeDecl_isStructWithUnreferenceableStorage(
   return false;
 }
 
+//===----------------------------------------------------------------------===//
+// MARK: BridgedParameterList
+//===----------------------------------------------------------------------===//
+
 BridgedParameterList BridgedParameterList_createParsed(
     BridgedASTContext cContext, BridgedSourceLoc cLeftParenLoc,
     BridgedArrayRef cParameters, BridgedSourceLoc cRightParenLoc) {
@@ -736,3 +740,12 @@ BridgedParameterList BridgedParameterList_createParsed(
                                cParameters.unbridged<ParamDecl *>(),
                                cRightParenLoc.unbridged());
 }
+
+size_t BridgedParameterList_size(BridgedParameterList cParameterList) {
+  return cParameterList.unbridged()->size();
+}
+
+BridgedParamDecl BridgedParameterList_get(BridgedParameterList cParameterList,
+                                          size_t i) {
+  return cParameterList.unbridged()->get(i);
+}

lib/AST/Bridging/ExprBridging.cpp

@@ -146,11 +146,20 @@ BridgedClosureExpr BridgedClosureExpr_createParsed(
                   declContext);
 }
 
+BridgedParameterList
+BridgedClosureExpr_getParameterList(BridgedClosureExpr cClosure) {
+  return cClosure.unbridged()->getParameters();
+}
+
 void BridgedClosureExpr_setParameterList(BridgedClosureExpr cClosure,
                                          BridgedParameterList cParams) {
   cClosure.unbridged()->setParameterList(cParams.unbridged());
 }
 
+bool BridgedClosureExpr_hasAnonymousClosureVars(BridgedClosureExpr cClosure) {
+  return cClosure.unbridged()->hasAnonymousClosureVars();
+}
+
 void BridgedClosureExpr_setHasAnonymousClosureVars(
     BridgedClosureExpr cClosure) {
   cClosure.unbridged()->setHasAnonymousClosureVars();