From: Devang Patel <dpatel@apple.com>
Date: Fri, 1 Oct 2010 19:00:44 +0000 (+0000)
Subject: Fix code gen crash reported in PR 8235. We still lose debug info for the unused argum... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=27f46cd6397c456df6f6f22a46752e64c0954fca;p=oota-llvm.git

Fix code gen crash reported in PR 8235. We still lose debug info for the unused argument here. This is a known limitation recorded debuginfo-tests/trunk/dbg-declare2.ll function 'f6' test case.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115323 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index fca9893db89..88a0f7b8705 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -3955,6 +3955,9 @@ SelectionDAGBuilder::EmitFuncArgumentDbgValue(const Value *V, MDNode *Variable,
     const TargetRegisterInfo *TRI = DAG.getTarget().getRegisterInfo();
     Reg = TRI->getFrameRegister(MF);
     Offset = FuncInfo.getByValArgumentFrameIndex(Arg);
+    // If byval argument ofset is not recorded then ignore this.
+    if (!Offset)
+      Reg = 0;
   }
 
   if (N.getNode() && N.getOpcode() == ISD::CopyFromReg) {
diff --git a/test/DebugInfo/2010-10-01-crash.ll b/test/DebugInfo/2010-10-01-crash.ll
new file mode 100644
index 00000000000..e61f63f40d8
--- /dev/null
+++ b/test/DebugInfo/2010-10-01-crash.ll
@@ -0,0 +1,21 @@
+; RUN: llc -O0 %s -o /dev/null
+; PR 8235
+
+define void @CGRectStandardize(i32* sret %agg.result, i32* byval %rect) nounwind ssp {
+entry:
+  call void @llvm.dbg.declare(metadata !{i32* %rect}, metadata !23), !dbg !24
+  ret void
+}
+
+declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
+
+
+!0 = metadata !{i32 589870, i32 0, metadata !1, metadata !"CGRectStandardize", metadata !"CGRectStandardize", metadata !"CGRectStandardize", metadata !1, i32 54, null, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 false, void (i32*, i32*)* @CGRectStandardize} ; [ DW_TAG_subprogram ]
+!1 = metadata !{i32 589865, metadata !"GSFusedSilica.m", metadata !"/Volumes/Data/Users/sabre/Desktop", metadata !2}
+!2 = metadata !{i32 589841, i32 0, i32 16, metadata !"GSFusedSilica.m", metadata !"/Volumes/Data/Users/sabre/Desktop", metadata !"clang version 2.9 (trunk 115292)", i1 true, i1 false, metadata !"", i32 1} ; [ DW_TAG_compile_unit ]
+!5 = metadata !{i32 589846, metadata !1, metadata !"CGRect", metadata !1, i32 49, i64 0, i64 0, i64 0, i32 0, null}
+!23 = metadata !{i32 590081, metadata !0, metadata !"rect", metadata !1, i32 53, metadata !5, i32 0} ; [ DW_TAG_arg_variable ]
+!24 = metadata !{i32 53, i32 33, metadata !0, null}
+