[ms-inline-asm] Add field access to MS inline asm identifier lookup

Now we can parse code like this:
  struct A {
    int field;
  };
  int f(A o) {
    __asm mov eax, o.field
  }

Fixes PR19117.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@246088 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 20 insertions, 3 deletions

diff --git a/lib/Parse/ParseStmtAsm.cpp b/lib/Parse/ParseStmtAsm.cpp
index 8cdae6a74b..d3281393f9 100644
--- a/lib/Parse/ParseStmtAsm.cpp
+++ b/lib/Parse/ParseStmtAsm.cpp
@@ -222,6 +222,25 @@ ExprResult Parser::ParseMSAsmIdentifier(llvm::SmallVectorImpl<Token> &LineToks,
                          /*AllowConstructorName=*/false,
                          /*ObjectType=*/ParsedType(), TemplateKWLoc, Id);
 
+  // Perform the lookup.
+  ExprResult Result = Actions.LookupInlineAsmIdentifier(
+      SS, TemplateKWLoc, Id, Info, IsUnevaluatedContext);
+
+  // While the next two tokens are 'period' 'identifier', repeatedly parse it as
+  // a field access. We have to avoid consuming assembler directives that look
+  // like '.' 'else'.
+  while (Result.isUsable() && Tok.is(tok::period)) {
+    Token IdTok = PP.LookAhead(0);
+    if (IdTok.isNot(tok::identifier))
+      break;
+    ConsumeToken(); // Consume the period.
+    IdentifierInfo *Id = Tok.getIdentifierInfo();
+    ConsumeToken(); // Consume the identifier.
+    unsigned OffsetUnused;
+    Result = Actions.LookupInlineAsmVarDeclField(
+        Result.get(), Id->getName(), OffsetUnused, Info, Tok.getLocation());
+  }
+
   // Figure out how many tokens we are into LineToks.
   unsigned LineIndex = 0;
   if (Tok.is(EndOfStream)) {
@@ -254,9 +273,7 @@ ExprResult Parser::ParseMSAsmIdentifier(llvm::SmallVectorImpl<Token> &LineToks,
   LineToks.pop_back();
   LineToks.pop_back();
 
-  // Perform the lookup.
-  return Actions.LookupInlineAsmIdentifier(SS, TemplateKWLoc, Id, Info,
-                                           IsUnevaluatedContext);
+  return Result;
 }
 
 /// Turn a sequence of our tokens back into a string that we can hand