[ASTImporter] Import fix of GCCAsmStmts w/ missing symbolic operands

Patch by Zoltan Gera!

Differential Revision: https://reviews.llvm.org/D30831

llvm-svn: 297627

3 files changed, 17 insertions, 2 deletions

diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 525d82e22d6..2a7768a4249 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -5218,13 +5218,17 @@ Stmt *ASTNodeImporter::VisitGCCAsmStmt(GCCAsmStmt *S) {
   SmallVector<IdentifierInfo *, 4> Names;
   for (unsigned I = 0, E = S->getNumOutputs(); I != E; I++) {
     IdentifierInfo *ToII = Importer.Import(S->getOutputIdentifier(I));
-    if (!ToII)
+    // ToII is nullptr when no symbolic name is given for output operand
+    // see ParseStmtAsm::ParseAsmOperandsOpt
+    if (!ToII && S->getOutputIdentifier(I))
       return nullptr;
     Names.push_back(ToII);
   }
   for (unsigned I = 0, E = S->getNumInputs(); I != E; I++) {
     IdentifierInfo *ToII = Importer.Import(S->getInputIdentifier(I));
-    if (!ToII)
+    // ToII is nullptr when no symbolic name is given for input operand
+    // see ParseStmtAsm::ParseAsmOperandsOpt
+    if (!ToII && S->getInputIdentifier(I))
       return nullptr;
     Names.push_back(ToII);
   }
diff --git a/clang/test/ASTMerge/asm/Inputs/asm-function.cpp b/clang/test/ASTMerge/asm/Inputs/asm-function.cpp
index 59c4edfbcd2..1b8783354fc 100644
--- a/clang/test/ASTMerge/asm/Inputs/asm-function.cpp
+++ b/clang/test/ASTMerge/asm/Inputs/asm-function.cpp
@@ -9,3 +9,13 @@ unsigned char asmFunc(unsigned char a, unsigned char b) {
   res = bigres;
   return res;
 }
+
+int asmFunc2(int i) {
+  int res;
+  asm ("mov %1, %0 \t\n"
+       "inc %0 "
+      : "=r" (res)
+      : "r" (i)
+      : "cc");
+  return res;
+}
diff --git a/clang/test/ASTMerge/asm/test.cpp b/clang/test/ASTMerge/asm/test.cpp
index 3a0a205720f..8c3bdfe17b7 100644
--- a/clang/test/ASTMerge/asm/test.cpp
+++ b/clang/test/ASTMerge/asm/test.cpp
@@ -4,4 +4,5 @@
 
 void testAsmImport() {
   asmFunc(12, 42);
+  asmFunc2(42);
 }