Fix llc crash on invalid input.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98369 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
index f175907e5d19ffef2c0f3e491d993b8f75855dec..8eaeeacd39b03d3e48f34936af17ba23a46e8e11 100644 (file)
--- a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
+++ b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
@@ -358,6 +358,13 @@ void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
       } else
         printOperand(MI, 0);
     } else {
+      if (MI->getOperand(0).getType()==MachineOperand::MO_Register &&
+          MI->getOperand(0).getReg()==0) {
+        // Suppress offset in this case, it is not meaningful.
+        O << "undef";
+        OutStreamer.AddBlankLine();
+        return;
+      }
       // Frame address.  Currently handles register +- offset only.
       assert(MI->getOperand(0).getType()==MachineOperand::MO_Register);
       assert(MI->getOperand(3).getType()==MachineOperand::MO_Immediate);

diff --git a/test/DebugInfo/2010-03-12-llc-crash.ll b/test/DebugInfo/2010-03-12-llc-crash.ll
new file mode 100644 (file)
index 0000000..f6de234
--- /dev/null
+++ b/test/DebugInfo/2010-03-12-llc-crash.ll
@@ -0,0 +1,20 @@
+; RUN: llc -O0 < %s -o /dev/null
+; llc should not crash on this invalid input.
+; PR6588
+declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
+
+define void @foo() {
+entry:
+  call void @llvm.dbg.declare(metadata !{i32* undef}, metadata !0)
+  ret void
+}
+
+!0 = metadata !{i32 524545, metadata !1, metadata !"sy", metadata !2, i32 890, metadata !7} ; [ DW_TAG_arg_variable ]
+!1 = metadata !{i32 524334, i32 0, metadata !2, metadata !"foo", metadata !"foo", metadata !"foo", metadata !2, i32 892, metadata !4, i1 false, i1 true, i32 0, i32 0, null, i1 false} ; [ DW_TAG_subprogram ]
+!2 = metadata !{i32 524329, metadata !"qpainter.h", metadata !"QtGui", metadata !3} ; [ DW_TAG_file_type ]
+!3 = metadata !{i32 524305, i32 0, i32 4, metadata !"splineeditor.cpp", metadata !"editor", metadata !"clang 1.1", i1 true, i1 false, metadata !"", i32 0} ; [ DW_TAG_compile_unit ]
+!4 = metadata !{i32 524309, metadata !5, metadata !"", metadata !5, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !6, i32 0, null} ; [ DW_TAG_subroutine_type ]
+!5 = metadata !{i32 524329, metadata !"splineeditor.cpp", metadata !"src", metadata !3} ; [ DW_TAG_file_type ]
+!6 = metadata !{null}
+!7 = metadata !{i32 524324, metadata !5, metadata !"int", metadata !5, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
+