Add Visual Studio Visualizers for more Clang types

[mspertus]

Summary

This is the first of a series of patches to add additional Visual Studio native visualizers for subclasses of clang::Type. For example, a SubstTemplateTypeParmType where the template type parameter "T" is replaced by the class "A" will show as follows in the locals window:

Type (1), SubstTemplateTypeParm (30): {Identifier (("T"))} => Record (25), {Identifier (("A"))}

Once this is accepted, I will continue to add further clang Type subclasses

[aaron.ballman]

clang.natvis

1–3

Do you know if these visualizers will work in MSVC 2013 as well, or are you using MSVC 2015-specific features? I ask because 2013 is our base MSVC version currently, so it would be good to know if this will break anyone. If the features work in 2013, we should probably change it from 2012 to 2013 in the comment.

[zturner]

Better yet, just delete the number

[aaron.ballman]

In D17908#368969, @zturner wrote:

Better yet, just delete the number

The number is sort of helpful since it's the only documentation as to what least common denominator we support. I don't have a strong attachment to the number, however.

[zturner]

Natvis has hardly changed at all since it was introduced, so I'm guessing
the lowest common denominator is always going to be our minimum required VS
version

[aaron.ballman]

In D17908#368972, @zturner wrote:

Natvis has hardly changed at all since it was introduced, so I'm guessing
the lowest common denominator is always going to be our minimum required VS
version

Awesome! Sold on removing the date.

[mspertus]

I believe that it will all work on VS2013 (and have kicked off a build to confirm). I guess I would rather drop the number so it doesn't get out of sync whenever the base compiler version changes.

[mspertus]

Hmm, testing reveals that the preexisting clang.natvis does not work in VS2013!

Natvis: E:\Users\mspertus\Documents\Visual Studio 2013\Visualizers\clang.natvis(59,21): Error: identifier "clang::TypeAlignmentInBits" is undefined

If I change all clang.natvis occurrences of clang::TypeAlignmentInBits to 4, it now works in VS2013 and VS2015, including all my edits. While this kind of hardwiring is brittle, it seems like the best option until we drop VS2013 support.

Is it ok for me to make that change?

[aaron.ballman]

In D17908#369337, @mspertus wrote:

Hmm, testing reveals that the preexisting clang.natvis does not work in VS2013!

Natvis: E:\Users\mspertus\Documents\Visual Studio 2013\Visualizers\clang.natvis(59,21): Error: identifier "clang::TypeAlignmentInBits" is undefined

If I change all clang.natvis occurrences of clang::TypeAlignmentInBits to 4, it now works in VS2013 and VS2015, including all my edits. While this kind of hardwiring is brittle, it seems like the best option until we drop VS2013 support.

Is it ok for me to make that change?

Yeah, I think that change makes sense. We can always rectify it when we drop support for MSVC 2013. Good catch!

[mspertus]

Updated in response to review comments to fix issues around MSVC versions

[mspertus]

Based on Eric Feiveson's comment that I can suppress the numeric value of an enum visualization with ", en" I have uploaded a new diff. By suppressing the numeric values, instead of the verbose TemplateArgumentLoc visualization

Type (0x00000001), SubstTemplateTypeParm (0x0000001e): {Identifier (("T"))} => Record (0x00000019), {Identifier (("A"))}

I get the much more readable

Type template parameter: SubstTemplateTypeParm: {Identifier (("T"))} => Record, {Identifier (("A"))}

[aaron.ballman]

LGTM. thank you!

[mspertus]

Committed, thanks!

[mspertus]

Committed as revision 262933

clang.natvis

 <?xml version="1.0" encoding="utf-8"?>
 <!--
-Visual Studio 2012 Native Debugging Visualizers for LLVM
+Visual Studio Native Debugging Visualizers for LLVM
 
-Put this file into "%USERPROFILE%\Documents\Visual Studio 2012\Visualizers"
+Put this file into "%USERPROFILE%\Documents\Visual Studio 20xx\Visualizers"
 or create a symbolic link so it updates automatically.
 -->
 <AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
   <Type Name="clang::Type">
-    <DisplayString Condition="(clang::Type::TypeClass)TypeBits.TC == clang::Type::Builtin">Builtin Type={(clang::BuiltinType::Kind)BuiltinTypeBits.Kind}</DisplayString>
-    <DisplayString Condition="(clang::Type::TypeClass)TypeBits.TC == clang::Type::Attributed">Modified Type={((clang::AttributedType*)this)->ModifiedType} Attribute={(clang::AttributedType::Kind)AttributedTypeBits.AttrKind}</DisplayString>
-    <DisplayString>Type Class={(clang::Type::TypeClass)TypeBits.TC}</DisplayString>
+    <DisplayString IncludeView="BaseOnly">{(clang::Type::TypeClass)TypeBits.TC}</DisplayString>
+    <DisplayString Condition="TypeBits.TC==clang::Type::TypeClass::Builtin">Builtin Type={*(clang::BuiltinType *)this}</DisplayString>
+    <DisplayString Condition="TypeBits.TC==clang::Type::Attributed">Modified Type={((clang::AttributedType*)this)->ModifiedType} Attribute={(clang::AttributedType::Kind)AttributedTypeBits.AttrKind}</DisplayString>
+    <DisplayString Condition="TypeBits.TC==clang::Type::TypeClass::SubstTemplateTypeParm">{*(clang::SubstTemplateTypeParmType *)this}</DisplayString>
+    <DisplayString Condition="TypeBits.TC==clang::Type::TypeClass::Record">{*(clang::RecordType *)this}</DisplayString>
+    <DisplayString>{(clang::Type::TypeClass)TypeBits.TC}</DisplayString>
+    <Expand>
+      <Item Name="TypeClass" IncludeView="BaseOnly">(clang::Type::TypeClass)TypeBits.TC</Item>
+      <Item Name="Flags" IncludeView="BaseOnly">TypeBits</Item>
+      <Item Name="Canonical" IncludeView="BaseOnly">CanonicalType</Item>
+      <ExpandedItem ExcludeView="BaseOnly" Condition="TypeBits.TC==clang::Type::TypeClass::Builtin">*(clang::BuiltinType *)this</ExpandedItem>
+      <ExpandedItem ExcludeView="BaseOnly" Condition="TypeBits.TC==clang::Type::TypeClass::SubstTemplateTypeParm">(clang::SubstTemplateTypeParmType *)this</ExpandedItem>
+      <ExpandedItem ExcludeView="BaseOnly" Condition="TypeBits.TC==clang::Type::TypeClass::Record">(clang::RecordType *)this</ExpandedItem>
+    </Expand>
+  </Type>
+  <Type Name="clang::TagType">
+    <DisplayString>{*decl}</DisplayString>
+    <Expand>
+      <Item Name="decl">decl</Item>
+    </Expand>
+  </Type>
+  <Type Name="clang::RecordType">
+    <DisplayString>{*(clang::Type *)this, view(BaseOnly)}, {*(clang::TagType *)this}</DisplayString>
+    <Expand>
+      <Item Name="TagType">*(clang::TagType *)this</Item>
+    </Expand>
+  </Type>
+  <Type Name="clang::SubstTemplateTypeParmType">
+    <DisplayString>{*(clang::Type *)this, view(BaseOnly)}: {*Replaced} =&gt; {CanonicalType}</DisplayString>
+    <Expand>
+      <ExpandedItem>*(clang::Type *)this, view(BaseOnly)</ExpandedItem>
+      <Item Name="Replaced">*Replaced</Item>
+    </Expand>
+  </Type>
+  <Type Name="clang::TemplateTypeParmType">
+    <DisplayString>{*TTPDecl}</DisplayString>
   </Type>
   <Type Name="clang::QualType">
-    <DisplayString>{((clang::ExtQualsTypeCommonBase *)(((uintptr_t)Value.Value) &amp; ~(uintptr_t)((1 &lt;&lt; clang::TypeAlignmentInBits) - 1)))-&gt;BaseType}</DisplayString>
+    <!-- TODO: Qualifiers. Also, when VS2013 support is deprecated, change 4 to clang::TypeAlignmentInBits (not properly recognized by VS2013) -->
+    <DisplayString>{*((clang::ExtQualsTypeCommonBase *)(((uintptr_t)Value.Value) &amp; ~(uintptr_t)((1 &lt;&lt; 4) - 1)))-&gt;BaseType}</DisplayString>
+    <Expand>
+      <Item Name="BaseType">*((clang::ExtQualsTypeCommonBase *)(((uintptr_t)Value.Value) &amp; ~(uintptr_t)((1 &lt;&lt; 4) - 1)))-&gt;BaseType</Item>
+    </Expand>
+  </Type>
+  <Type Name="clang::TemplateArgumentLoc">
+    <DisplayString>{Argument}</DisplayString>
+    <Expand>
+      <ExpandedItem>Argument</ExpandedItem>
+    </Expand>
+  </Type>
+  <Type Name="clang::TemplateArgument">
+    <DisplayString>{(clang::TemplateArgument::ArgKind)TypeOrValue.Kind}, {*(clang::QualType *)&amp;TypeOrValue.V}</DisplayString>
+    <Expand>
+      <Item Name="QualType" Condition="Integer.Kind == clang::TemplateArgument::ArgKind::Type">*(clang::QualType *)&amp;TypeOrValue.V</Item>
+      <!-- TODO: Other kinds-->
+    </Expand>
+  </Type>
+  <Type Name="clang::BuiltinType">
+    <DisplayString>{(clang::BuiltinType::Kind)BuiltinTypeBits.Kind}</DisplayString>
+    <Expand>
+      <Item Name="Kind">(clang::BuiltinType::Kind)BuiltinTypeBits.Kind</Item>
+    </Expand>
+  </Type>
+  <Type Name="clang::NamedDecl">
+    <DisplayString>{Name}</DisplayString>
+  </Type>
+  <Type Name="clang::TemplateSpecializationType">
+    <DisplayString Condition="(Template.Storage.Val.Val.Value &amp; 3) != 3 &amp;&amp; (Template.Storage.Val.Val.Value &amp; 2) != 2 &amp;&amp; (Template.Storage.Val.Val.Value &amp; 1) != 1">{(clang::TemplateDecl *)((Template.Storage.Val.Val.Value &gt;&gt; 2) &lt;&lt; 2)}</DisplayString>
+    <DisplayString>{Template.Storage}</DisplayString>
   </Type>
   <Type Name="clang::IdentifierInfo">
     <DisplayString Condition="Entry != 0">({((llvm::StringMapEntry&lt;clang::IdentifierInfo *&gt;*)Entry)+1,s})</DisplayString>
     <Expand>
       <Item Condition="Entry != 0" Name="[Identifier]">((llvm::StringMapEntry&lt;clang::IdentifierInfo *&gt;*)Entry)+1,s</Item>
       <Item Name="Token Kind">(clang::tok::TokenKind)TokenID</Item>
     </Expand>
   </Type>
<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
   <Type Name="clang::VarDecl">
     <DisplayString>{Name}</DisplayString>
     <Expand>
       <ExpandedItem>*(DeclaratorDecl*)this,nd</ExpandedItem>
       <Item Name="VarDeclBits">VarDeclBits</Item>
       <Item Name="ParmVarDeclBits">ParmVarDeclBits</Item>
     </Expand>
   </Type>
+  <Type Name="clang::OpaquePtr&lt;*&gt;">
+    <DisplayString>{($T1 *)Ptr</DisplayString>
+    <Expand>
+      <ExpandedItem>($T1 *)Ptr</ExpandedItem>
+    </Expand>
+  </Type>
 </AutoVisualizer>