[ASTDump] Add a flag indicating whether a CXXThisExpr is implicit

There is currently no way to distinguish implicit from explicit
CXXThisExpr in the AST dump output.

Differential Revision: https://reviews.llvm.org/D57649

Reviewed By: steveire

llvm-svn: 353003

clang/lib/AST/TextNodeDumper.cpp

@@ -854,6 +854,8 @@ void TextNodeDumper::VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *Node) {
 }
 
 void TextNodeDumper::VisitCXXThisExpr(const CXXThisExpr *Node) {
+  if (Node->isImplicit())
+    OS << " implicit";
   OS << " this";
 }
 

clang/test/AST/ast-dump-expr.cpp

@@ -255,7 +255,7 @@ void PrimaryExpressions(Ts... a) {
       // CHECK-NEXT: FieldDecl 0x{{[^ ]*}} <col:8> col:8 implicit 'V *'
       // CHECK-NEXT: CXXMethodDecl
       // CHECK-NEXT: CompoundStmt
-      // CHECK-NEXT: CXXThisExpr 0x{{[^ ]*}} <col:8> 'V *' this
+      // CHECK-NEXT: CXXThisExpr 0x{{[^ ]*}} <col:8> 'V *' implicit this
 
       [*this]{};
       // CHECK: LambdaExpr 0x{{[^ ]*}} <line:[[@LINE-1]]:7, col:15>
@@ -272,7 +272,7 @@ void PrimaryExpressions(Ts... a) {
       // CHECK-NEXT: CompoundStmt
       // CHECK-NEXT: ParenListExpr 0x{{[^ ]*}} <col:8> 'NULL TYPE'
       // CHECK-NEXT: UnaryOperator 0x{{[^ ]*}} <col:8> '<dependent type>' prefix '*' cannot overflow
-      // CHECK-NEXT: CXXThisExpr 0x{{[^ ]*}} <col:8> 'V *' this
+      // CHECK-NEXT: CXXThisExpr 0x{{[^ ]*}} <col:8> 'V *' implicit this
     }
   };
 

clang/test/AST/dump.cpp

@@ -56,7 +56,7 @@ struct S {
 // CHECK-NEXT: |       | `-DeclRefExpr {{.+}} <col:48> 'int' lvalue OMPCapturedExpr {{.+}} 'a' 'int &'
 // CHECK-NEXT: |       |-OMPSharedClause {{.+}} <col:51, col:59>
 // CHECK-NEXT: |       | `-MemberExpr {{.+}} <col:58> 'int' lvalue ->b
-// CHECK-NEXT: |       |   `-CXXThisExpr {{.+}} <col:58> 'S *' this
+// CHECK-NEXT: |       |   `-CXXThisExpr {{.+}} <col:58> 'S *' implicit this
 // CHECK-NEXT: |       |-OMPScheduleClause {{.+}} <col:61, col:79>
 // CHECK-NEXT: |       | `-ImplicitCastExpr {{.+}} <col:78> 'int' <LValueToRValue>
 // CHECK-NEXT: |       |   `-DeclRefExpr {{.+}} <col:78> 'int' lvalue OMPCapturedExpr {{.+}} '.capture_expr.' 'int'

clang/test/AST/float16.cpp

@@ -132,7 +132,7 @@ class C1 {
 //CHECK-NEXT: | |     `-BinaryOperator {{.*}} '_Float16' '+'
 //CHECK-NEXT: | |       |-ImplicitCastExpr {{.*}} '_Float16' <LValueToRValue>
 //CHECK-NEXT: | |       | `-MemberExpr {{.*}} '_Float16' lvalue ->f1c 0x{{.*}}
-//CHECK-NEXT: | |       |   `-CXXThisExpr {{.*}} 'C1 *' this
+//CHECK-NEXT: | |       |   `-CXXThisExpr {{.*}} 'C1 *' implicit this
 //CHECK-NEXT: | |       `-ImplicitCastExpr {{.*}} '_Float16' <LValueToRValue>
 //CHECK-NEXT: | |         `-DeclRefExpr {{.*}} '_Float16' lvalue ParmVar 0x{{.*}} 'arg' '_Float16'
 //CHECK-NEXT: | |-CXXMethodDecl {{.*}} used func2c '_Float16 (_Float16)' static