Add test cases for bug reported in issue #49

tests/expected_graphs/extractvalue_constant_struct.dot

@@ -0,0 +1,18 @@
+digraph unnamed {
+	graph [center=true, ratio=true, bgcolor=lightgray, fontname=Helvetica];
+	node  [fontname=Helvetica, fontsize=11];
+
+	Node0x7fc5c8e0cdc0 [shape=record,label="{\{0:i16\}:R}"];
+	Node0x7fc5c8e0cf80 [shape=record,label="{\{0:i16*,4:i32\}:SMR|{<s0>\<0, unknown\>}}"];
+	Node0x7fc5c8e08590 [shape=plaintext, label ="\{ i16*, i32 \} undef"];
+	Node0x7fc5c8e08590 -> Node0x7fc5c8e0cf80[arrowtail=tee,label="0",fontsize=8,color=purple];
+	Node0x7fc5c8e085e0 [shape=plaintext, label ="ss0"];
+	Node0x7fc5c8e085e0 -> Node0x7fc5c8e0cf80[arrowtail=tee,label="0",fontsize=8,color=purple];
+	Node0x7fc5c8e07998 [shape=plaintext, label ="g.ptr"];
+	Node0x7fc5c8e07998 -> Node0x7fc5c8e0cdc0[arrowtail=tee,label="0",fontsize=8,color=purple];
+	Node0x7fc5c8e086c0 [shape=plaintext, label ="ss1"];
+	Node0x7fc5c8e086c0 -> Node0x7fc5c8e0cf80[arrowtail=tee,label="0",fontsize=8,color=purple];
+	Node0x7fc5c8e08758 [shape=plaintext, label ="v2.p"];
+	Node0x7fc5c8e08758 -> Node0x7fc5c8e0cdc0[arrowtail=tee,label="0",fontsize=8,color=purple];
+	Node0x7fc5c8e0cf80:s0 -> Node0x7fc5c8e0cdc0[arrowtail=tee,label="0",fontsize=8];
+}

tests/extractvalue_constant_struct.bad.ll

@@ -0,0 +1,48 @@
+; RUN: %seadsa  %butd_dsa --sea-dsa-dot %s --sea-dsa-dot-outdir=%T/extractvalue_constant_struct.bad.ll
+; RUN: %cmp-graphs %tests/extractvalue_constant_struct.dot %T/extractvalue_constant_struct.bad.ll/main.mem.dot | OutputCheck %s -d --comment=";"
+; CHECK: ^OK$
+; XFAIL: *
+
+source_filename = "/tmp/st.c"
+target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
+target triple = "i386-apple-macosx10.13.0"
+
+%struct.s = type { i16*, i32 } ; struct with a ptr to i16 and a i32 int
+@g.ptr =  internal unnamed_addr global i16 42, align 4
+declare void @verifier.assume.not(i1)
+declare void @seahorn.fail()
+
+
+; Function Attrs: noreturn
+declare void @verifier.error() #0
+
+; Function Attrs: noinline nounwind ssp uwtable
+define i32 @main() local_unnamed_addr #2 {
+entry:
+  %v1 = load i16, i16* @g.ptr
+  %v2.p = extractvalue %struct.s {i16* @g.ptr, i32 0}, 0
+  %v2 = load i16, i16* %v2.p
+  %cond = icmp eq i16 %v1, %v2
+  call void @verifier.assume.not(i1 %cond)
+  br label %verifier.error
+
+verifier.error:                                   ; preds = %entry
+  call void @seahorn.fail()
+  br label %verifier.error.split
+
+verifier.error.split:                             ; preds = %verifier.error
+  ret i32 42
+}
+
+attributes #0 = { noreturn }
+attributes #1 = { argmemonly nounwind }
+attributes #2 = { noinline nounwind ssp uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #3 = { nounwind }
+
+!llvm.module.flags = !{!0, !1, !2}
+!llvm.ident = !{!3}
+
+!0 = !{i32 1, !"NumRegisterParameters", i32 0}
+!1 = !{i32 1, !"wchar_size", i32 4}
+!2 = !{i32 7, !"PIC Level", i32 2}
+!3 = !{!"clang version 5.0.2 (tags/RELEASE_502/final)"}

tests/extractvalue_constant_struct.ok.ll

@@ -0,0 +1,50 @@
+; RUN: %seadsa  %butd_dsa --sea-dsa-dot %s --sea-dsa-dot-outdir=%T/extractvalue_constant_struct.ok.ll
+; RUN: %cmp-graphs %tests/extractvalue_constant_struct.dot %T/extractvalue_constant_struct.ok.ll/main.mem.dot | OutputCheck %s -d --comment=";"
+; CHECK: ^OK$
+
+source_filename = "/tmp/st.c"
+target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
+target triple = "i386-apple-macosx10.13.0"
+
+%struct.s = type { i16*, i32 } ; struct with a ptr to i16 and a i32 int
+@g.ptr =  internal unnamed_addr global i16 42, align 4
+declare void @verifier.assume.not(i1)
+declare void @seahorn.fail()
+
+
+; Function Attrs: noreturn
+declare void @verifier.error() #0
+
+; Function Attrs: noinline nounwind ssp uwtable
+define i32 @main() local_unnamed_addr #2 {
+entry:
+  %v1 = load i16, i16* @g.ptr
+  %ss0 = insertvalue {i16*, i32} undef, i16* @g.ptr, 0
+  %ss1 = insertvalue {i16*, i32} %ss0, i32 0, 1
+  %v2.p = extractvalue {i16*, i32} %ss0, 0
+  ;; %v2.p = extractvalue %struct.s {i16* @g.ptr, i32 0}, 0
+  %v2 = load i16, i16* %v2.p
+  %cond = icmp eq i16 %v1, %v2
+  call void @verifier.assume.not(i1 %cond)
+  br label %verifier.error
+
+verifier.error:                                   ; preds = %entry
+  call void @seahorn.fail()
+  br label %verifier.error.split
+
+verifier.error.split:                             ; preds = %verifier.error
+  ret i32 42
+}
+
+attributes #0 = { noreturn }
+attributes #1 = { argmemonly nounwind }
+attributes #2 = { noinline nounwind ssp uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #3 = { nounwind }
+
+!llvm.module.flags = !{!0, !1, !2}
+!llvm.ident = !{!3}
+
+!0 = !{i32 1, !"NumRegisterParameters", i32 0}
+!1 = !{i32 1, !"wchar_size", i32 4}
+!2 = !{i32 7, !"PIC Level", i32 2}
+!3 = !{!"clang version 5.0.2 (tags/RELEASE_502/final)"}