[PATCH] D126620: [clang] AST/Print: honor AlwaysIncludeTypeForTemplateArgument policy

[Matheus Izvekov via Phabricator via cfe-commits]

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This redoes D103040 <https://reviews.llvm.org/D103040> in a way that `AlwaysIncludeTypeForTemplateArgument = false`
policy is honored for printing template specialization types.
This can be seen for example when printing a canonicalized
dependent TemplateSpecializationType which has integral arguments.

Signed-off-by: Matheus Izvekov <mizvekov at gmail.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126620

Files:
  clang/lib/AST/TypePrinter.cpp
  clang/test/CXX/temp/temp.decls/temp.class.spec/p6.cpp


Index: clang/test/CXX/temp/temp.decls/temp.class.spec/p6.cpp
===================================================================
--- clang/test/CXX/temp/temp.decls/temp.class.spec/p6.cpp
+++ clang/test/CXX/temp/temp.decls/temp.class.spec/p6.cpp
@@ -80,7 +80,7 @@
 template <class T, class U> struct Foo {
   template <unsigned long, class X, class Y> struct Bar;
   template <class Y> struct Bar<0, T, Y> {};
-  // expected-note-re at -1 {{previous declaration {{.*}} 'Bar<0UL, int, type-parameter-0-0>' is here}}
+  // expected-note-re at -1 {{previous declaration {{.*}} 'Bar<0, int, type-parameter-0-0>' is here}}
   template <class Y> struct Bar<0, U, Y> {};
   // expected-error at -1 {{partial specialization 'Bar<0, int, Y>' cannot be redeclared}}
 };
Index: clang/lib/AST/TypePrinter.cpp
===================================================================
--- clang/lib/AST/TypePrinter.cpp
+++ clang/lib/AST/TypePrinter.cpp
@@ -80,6 +80,21 @@
     }
   };
 
+  class DefaultTemplateArgsPolicyRAII {
+    PrintingPolicy &Policy;
+    bool Old;
+
+  public:
+    explicit DefaultTemplateArgsPolicyRAII(PrintingPolicy &Policy)
+        : Policy(Policy), Old(Policy.SuppressDefaultTemplateArgs) {
+      Policy.SuppressDefaultTemplateArgs = false;
+    }
+
+    ~DefaultTemplateArgsPolicyRAII() {
+      Policy.SuppressDefaultTemplateArgs = Old;
+    }
+  };
+
   class ElaboratedTypePolicyRAII {
     PrintingPolicy &Policy;
     bool SuppressTagKeyword;
@@ -1470,6 +1485,7 @@
   IncludeStrongLifetimeRAII Strong(Policy);
 
   TemplateDecl *TD = T->getTemplateName().getAsTemplateDecl();
+  // FIXME: Null TD never excercised in test suite.
   if (FullyQualify && TD) {
     if (!Policy.SuppressScope)
       AppendScope(TD->getDeclContext(), OS, TD->getDeclName());
@@ -1479,7 +1495,9 @@
     T->getTemplateName().print(OS, Policy);
   }
 
-  printTemplateArgumentList(OS, T->template_arguments(), Policy);
+  DefaultTemplateArgsPolicyRAII TemplateArgs(Policy);
+  const TemplateParameterList *TPL = TD ? TD->getTemplateParameters() : nullptr;
+  printTemplateArgumentList(OS, T->template_arguments(), Policy, TPL);
   spaceBeforePlaceHolder(OS);
 }
 


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