The Dwarf writer was comparing mangled and unmangled names for C++ code when we

have an unreachable block in a function. This was triggering the assert. This is
a horrid hack to cover this up.

Oh! for a good debug info architecture!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57714 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/DwarfWriter.cpp b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
index 3cfe00e7e07ad6ceea530882ae0fb81fa56a26bd..1cf75b923b36c2e1bc3a8d2304dfb8c0e0d88179 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
@@ -2060,8 +2060,11 @@ private:
         return;
       }
     }
-
+#if 0
+    // FIXME: This is causing an abort because C++ mangled names are compared
+    // with their unmangled counterparts. See PR2885. Don't do this assert.
     assert(0 && "Couldn't find DIE for machine function!");
+#endif
   }
 
   /// EmitInitial - Emit initial Dwarf declarations.  This is necessary for cc

diff --git a/test/DebugInfo/2008-10-17-C++DebugCrash.ll b/test/DebugInfo/2008-10-17-C++DebugCrash.ll
new file mode 100644 (file)
index 0000000..b56b949
--- /dev/null
+++ b/test/DebugInfo/2008-10-17-C++DebugCrash.ll
@@ -0,0 +1,58 @@
+; RUN: llvm-as < %s | llc
+; PR2885
+
+;; NOTE: This generates bad debug info in this case! But that's better than
+;; ICEing.
+
+; ModuleID = 'bug.bc'
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
+target triple = "i386-pc-linux-gnu"
+       %llvm.dbg.anchor.type = type { i32, i32 }
+       %llvm.dbg.basictype.type = type { i32, { }*, i8*, { }*, i32, i64, i64, i64, i32, i32 }
+       %llvm.dbg.compile_unit.type = type { i32, { }*, i32, i8*, i8*, i8* }
+       %llvm.dbg.subprogram.type = type { i32, { }*, { }*, i8*, i8*, i8*, { }*, i32, { }*, i1, i1 }
+       %llvm.dbg.variable.type = type { i32, { }*, i8*, { }*, i32, { }* }
+@llvm.dbg.subprogram = internal constant %llvm.dbg.subprogram.type { i32 393262, { }* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.subprograms to { }*), { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i8* getelementptr ([11 x i8]* @.str3, i32 0, i32 0), i8* getelementptr ([11 x i8]* @.str3, i32 0, i32 0), i8* null, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i32 14, { }* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype to { }*), i1 true, i1 true }             ; <%llvm.dbg.subprogram.type*> [#uses=0]
+@llvm.dbg.subprograms = linkonce constant %llvm.dbg.anchor.type { i32 393216, i32 46 }         ; <%llvm.dbg.anchor.type*> [#uses=1]
+@llvm.dbg.compile_unit = internal constant %llvm.dbg.compile_unit.type { i32 393233, { }* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.compile_units to { }*), i32 4, i8* getelementptr ([7 x i8]* @.str, i32 0, i32 0), i8* getelementptr ([16 x i8]* @.str1, i32 0, i32 0), i8* getelementptr ([52 x i8]* @.str2, i32 0, i32 0) }               ; <%llvm.dbg.compile_unit.type*> [#uses=1]
+@llvm.dbg.compile_units = linkonce constant %llvm.dbg.anchor.type { i32 393216, i32 17 }               ; <%llvm.dbg.anchor.type*> [#uses=1]
+@.str = internal constant [7 x i8] c"die.cc\00"                ; <[7 x i8]*> [#uses=1]
+@.str1 = internal constant [16 x i8] c"/home/nicholas/\00"             ; <[16 x i8]*> [#uses=1]
+@.str2 = internal constant [52 x i8] c"4.2.1 (Based on Apple Inc. build 5623) (LLVM build)\00"         ; <[52 x i8]*> [#uses=1]
+@.str3 = internal constant [11 x i8] c"AssertFail\00"          ; <[11 x i8]*> [#uses=1]
+@llvm.dbg.basictype = internal constant %llvm.dbg.basictype.type { i32 393252, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i8* getelementptr ([4 x i8]* @.str4, i32 0, i32 0), { }* null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5 }         ; <%llvm.dbg.basictype.type*> [#uses=1]
+@.str4 = internal constant [4 x i8] c"int\00"          ; <[4 x i8]*> [#uses=1]
+@llvm.dbg.subprogram5 = internal constant %llvm.dbg.subprogram.type { i32 393262, { }* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.subprograms to { }*), { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i8* getelementptr ([7 x i8]* @.str6, i32 0, i32 0), i8* getelementptr ([7 x i8]* @.str6, i32 0, i32 0), i8* null, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i32 19, { }* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype7 to { }*), i1 true, i1 true }             ; <%llvm.dbg.subprogram.type*> [#uses=1]
+@.str6 = internal constant [7 x i8] c"FooOne\00"               ; <[7 x i8]*> [#uses=1]
+@llvm.dbg.basictype7 = internal constant %llvm.dbg.basictype.type { i32 393252, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i8* getelementptr ([9 x i8]* @.str8, i32 0, i32 0), { }* null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5 }                ; <%llvm.dbg.basictype.type*> [#uses=1]
+@.str8 = internal constant [9 x i8] c"long int\00"             ; <[9 x i8]*> [#uses=1]
+@llvm.dbg.variable = internal constant %llvm.dbg.variable.type { i32 393473, { }* bitcast (%llvm.dbg.subprogram.type* @llvm.dbg.subprogram5 to { }*), i8* getelementptr ([6 x i8]* @.str9, i32 0, i32 0), { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i32 19, { }* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype10 to { }*) }         ; <%llvm.dbg.variable.type*> [#uses=0]
+@.str9 = internal constant [6 x i8] c"count\00"                ; <[6 x i8]*> [#uses=1]
+@llvm.dbg.basictype10 = internal constant %llvm.dbg.basictype.type { i32 393252, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i8* getelementptr ([18 x i8]* @.str11, i32 0, i32 0), { }* null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 7 }             ; <%llvm.dbg.basictype.type*> [#uses=1]
+@.str11 = internal constant [18 x i8] c"long unsigned int\00"          ; <[18 x i8]*> [#uses=1]
+@llvm.dbg.subprogram12 = internal constant %llvm.dbg.subprogram.type { i32 393262, { }* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.subprograms to { }*), { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i8* getelementptr ([7 x i8]* @.str13, i32 0, i32 0), i8* getelementptr ([7 x i8]* @.str13, i32 0, i32 0), i8* null, { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i32 24, { }* bitcast (%llvm.dbg.basictype.type* @llvm.dbg.basictype7 to { }*), i1 true, i1 true }          ; <%llvm.dbg.subprogram.type*> [#uses=0]
+@.str13 = internal constant [7 x i8] c"FooTwo\00"              ; <[7 x i8]*> [#uses=1]
+@llvm.dbg.subprogram14 = internal constant %llvm.dbg.subprogram.type { i32 393262, { }* bitcast (%llvm.dbg.anchor.type* @llvm.dbg.subprograms to { }*), { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i8* getelementptr ([9 x i8]* @.str15, i32 0, i32 0), i8* getelementptr ([9 x i8]* @.str15, i32 0, i32 0), i8* getelementptr ([13 x i8]* @.str16, i32 0, i32 0), { }* bitcast (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit to { }*), i32 29, { }* null, i1 false, i1 true }         ; <%llvm.dbg.subprogram.type*> [#uses=0]
+@.str15 = internal constant [9 x i8] c"FooThree\00"            ; <[9 x i8]*> [#uses=1]
+@.str16 = internal constant [13 x i8] c"_Z8FooThreev\00"               ; <[13 x i8]*> [#uses=1]
+
+declare void @_Z8FooThreev() nounwind
+
+define internal i32 @_ZL10AssertFailv() nounwind {
+entry:
+       unreachable
+}
+
+declare void @llvm.dbg.func.start({ }*) nounwind
+
+declare void @llvm.dbg.stoppoint(i32, i32, { }*) nounwind
+
+declare void @abort() noreturn nounwind
+
+declare void @llvm.dbg.region.end({ }*) nounwind
+
+declare i32 @_ZL6FooOnem(i32) nounwind
+
+declare void @llvm.dbg.declare({ }*, { }*) nounwind
+
+declare i32 @_ZL6FooTwov() nounwind