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llvm-6502/test/CodeGen/X86/2010-08-04-StackVariable.ll
Duncan P. N. Exon Smith 83902832de Revert "Revert "DI: Fold constant arguments into a single MDString"" 
This reverts commit r218918, effectively reapplying r218914 after fixing
an Ocaml bindings test and an Asan crash.  The root cause of the latter
was a tightened-up check in `DILexicalBlock::Verify()`, so I'll file a
PR to investigate who requires the loose check (and why).

Original commit message follows.

--

This patch addresses the first stage of PR17891 by folding constant
arguments together into a single MDString.  Integers are stringified and
a `\0` character is used as a separator.

Part of PR17891.

Note: I've attached my testcases upgrade scripts to the PR.  If I've
just broken your out-of-tree testcases, they might help.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219010 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-03 20:01:09 +00:00

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; RUN: llc -O0 -mtriple=x86_64-apple-darwin < %s | grep DW_OP_breg7
; Use DW_OP_breg7 in variable's location expression if the variable is in a stack slot.
%struct.SVal = type { i8*, i32 }
define i32 @_Z3fooi4SVal(i32 %i, %struct.SVal* noalias %location) nounwind ssp {
entry:
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
call void @llvm.dbg.value(metadata !{i32 %i}, i64 0, metadata !23, metadata !{metadata !"0x102"}), !dbg !24
call void @llvm.dbg.value(metadata !{%struct.SVal* %location}, i64 0, metadata !25, metadata !{metadata !"0x102"}), !dbg !24
%0 = icmp ne i32 %i, 0, !dbg !27 ; <i1> [#uses=1]
br i1 %0, label %bb, label %bb1, !dbg !27
bb: ; preds = %entry
%1 = getelementptr inbounds %struct.SVal* %location, i32 0, i32 1, !dbg !29 ; <i32*> [#uses=1]
%2 = load i32* %1, align 8, !dbg !29 ; <i32> [#uses=1]
%3 = add i32 %2, %i, !dbg !29 ; <i32> [#uses=1]
br label %bb2, !dbg !29
bb1: ; preds = %entry
%4 = getelementptr inbounds %struct.SVal* %location, i32 0, i32 1, !dbg !30 ; <i32*> [#uses=1]
%5 = load i32* %4, align 8, !dbg !30 ; <i32> [#uses=1]
%6 = sub i32 %5, 1, !dbg !30 ; <i32> [#uses=1]
br label %bb2, !dbg !30
bb2: ; preds = %bb1, %bb
%.0 = phi i32 [ %3, %bb ], [ %6, %bb1 ] ; <i32> [#uses=1]
br label %return, !dbg !29
return: ; preds = %bb2
ret i32 %.0, !dbg !29
}
define linkonce_odr void @_ZN4SValC1Ev(%struct.SVal* %this) nounwind ssp align 2 {
entry:
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
call void @llvm.dbg.value(metadata !{%struct.SVal* %this}, i64 0, metadata !31, metadata !{metadata !"0x102"}), !dbg !34
%0 = getelementptr inbounds %struct.SVal* %this, i32 0, i32 0, !dbg !34 ; <i8**> [#uses=1]
store i8* null, i8** %0, align 8, !dbg !34
%1 = getelementptr inbounds %struct.SVal* %this, i32 0, i32 1, !dbg !34 ; <i32*> [#uses=1]
store i32 0, i32* %1, align 8, !dbg !34
br label %return, !dbg !34
return: ; preds = %entry
ret void, !dbg !35
}
declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
define i32 @main() nounwind ssp {
entry:
%0 = alloca %struct.SVal ; <%struct.SVal*> [#uses=3]
%v = alloca %struct.SVal ; <%struct.SVal*> [#uses=4]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
call void @llvm.dbg.declare(metadata !{%struct.SVal* %v}, metadata !38, metadata !{metadata !"0x102"}), !dbg !41
call void @_ZN4SValC1Ev(%struct.SVal* %v) nounwind, !dbg !41
%1 = getelementptr inbounds %struct.SVal* %v, i32 0, i32 1, !dbg !42 ; <i32*> [#uses=1]
store i32 1, i32* %1, align 8, !dbg !42
%2 = getelementptr inbounds %struct.SVal* %0, i32 0, i32 0, !dbg !43 ; <i8**> [#uses=1]
%3 = getelementptr inbounds %struct.SVal* %v, i32 0, i32 0, !dbg !43 ; <i8**> [#uses=1]
%4 = load i8** %3, align 8, !dbg !43 ; <i8*> [#uses=1]
store i8* %4, i8** %2, align 8, !dbg !43
%5 = getelementptr inbounds %struct.SVal* %0, i32 0, i32 1, !dbg !43 ; <i32*> [#uses=1]
%6 = getelementptr inbounds %struct.SVal* %v, i32 0, i32 1, !dbg !43 ; <i32*> [#uses=1]
%7 = load i32* %6, align 8, !dbg !43 ; <i32> [#uses=1]
store i32 %7, i32* %5, align 8, !dbg !43
%8 = call i32 @_Z3fooi4SVal(i32 2, %struct.SVal* noalias %0) nounwind, !dbg !43 ; <i32> [#uses=0]
call void @llvm.dbg.value(metadata !{i32 %8}, i64 0, metadata !44, metadata !{metadata !"0x102"}), !dbg !43
br label %return, !dbg !45
return: ; preds = %entry
ret i32 0, !dbg !45
}
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
!llvm.dbg.cu = !{!3}
!llvm.module.flags = !{!49}
!46 = metadata !{metadata !16, metadata !17, metadata !20}
!0 = metadata !{metadata !"0x2e\00SVal\00SVal\00\0011\000\000\000\006\000\000\0011", metadata !47, metadata !1, metadata !14, null, null, null, null, null} ; [ DW_TAG_subprogram ]
!1 = metadata !{metadata !"0x13\00SVal\001\00128\0064\000\000\000", metadata !47, metadata !2, null, metadata !4, null, null, null} ; [ DW_TAG_structure_type ] [SVal] [line 1, size 128, align 64, offset 0] [def] [from ]
!2 = metadata !{metadata !"0x29", metadata !47} ; [ DW_TAG_file_type ]
!3 = metadata !{metadata !"0x11\004\004.2.1 (Based on Apple Inc. build 5658) (LLVM build)\000\00\000\00\001", metadata !47, metadata !48, metadata !48, metadata !46, null, null} ; [ DW_TAG_compile_unit ]
!4 = metadata !{metadata !5, metadata !7, metadata !0, metadata !9}
!5 = metadata !{metadata !"0xd\00Data\007\0064\0064\000\000", metadata !47, metadata !1, metadata !6} ; [ DW_TAG_member ]
!6 = metadata !{metadata !"0xf\00\000\0064\0064\000\000", metadata !47, metadata !2, null} ; [ DW_TAG_pointer_type ]
!7 = metadata !{metadata !"0xd\00Kind\008\0032\0032\0064\000", metadata !47, metadata !1, metadata !8} ; [ DW_TAG_member ]
!8 = metadata !{metadata !"0x24\00unsigned int\000\0032\0032\000\000\007", metadata !47, metadata !2} ; [ DW_TAG_base_type ]
!9 = metadata !{metadata !"0x2e\00~SVal\00~SVal\00\0012\000\000\000\006\000\000\0012", metadata !47, metadata !1, metadata !10, null, null, null, null, null} ; [ DW_TAG_subprogram ]
!10 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !47, metadata !2, null, metadata !11, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!11 = metadata !{null, metadata !12, metadata !13}
!12 = metadata !{metadata !"0xf\00\000\0064\0064\000\0064", metadata !47, metadata !2, metadata !1} ; [ DW_TAG_pointer_type ]
!13 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", metadata !47, metadata !2} ; [ DW_TAG_base_type ]
!14 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !47, metadata !2, null, metadata !15, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!15 = metadata !{null, metadata !12}
!16 = metadata !{metadata !"0x2e\00SVal\00SVal\00_ZN4SValC1Ev\0011\000\001\000\006\000\000\0011", metadata !47, metadata !1, metadata !14, null, void (%struct.SVal*)* @_ZN4SValC1Ev, null, null, null} ; [ DW_TAG_subprogram ]
!17 = metadata !{metadata !"0x2e\00foo\00foo\00_Z3fooi4SVal\0016\000\001\000\006\000\000\0016", metadata !47, metadata !2, metadata !18, null, i32 (i32, %struct.SVal*)* @_Z3fooi4SVal, null, null, null} ; [ DW_TAG_subprogram ]
!18 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !47, metadata !2, null, metadata !19, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!19 = metadata !{metadata !13, metadata !13, metadata !1}
!20 = metadata !{metadata !"0x2e\00main\00main\00main\0023\000\001\000\006\000\000\0023", metadata !47, metadata !2, metadata !21, null, i32 ()* @main, null, null, null} ; [ DW_TAG_subprogram ]
!21 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !47, metadata !2, null, metadata !22, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!22 = metadata !{metadata !13}
!23 = metadata !{metadata !"0x101\00i\0016\000", metadata !17, metadata !2, metadata !13} ; [ DW_TAG_arg_variable ]
!24 = metadata !{i32 16, i32 0, metadata !17, null}
!25 = metadata !{metadata !"0x101\00location\0016\000", metadata !17, metadata !2, metadata !26} ; [ DW_TAG_arg_variable ]
!26 = metadata !{metadata !"0x10\00SVal\000\0064\0064\000\000", metadata !47, metadata !2, metadata !1} ; [ DW_TAG_reference_type ]
!27 = metadata !{i32 17, i32 0, metadata !28, null}
!28 = metadata !{metadata !"0xb\0016\000\002", metadata !47, metadata !17} ; [ DW_TAG_lexical_block ]
!29 = metadata !{i32 18, i32 0, metadata !28, null}
!30 = metadata !{i32 20, i32 0, metadata !28, null}
!31 = metadata !{metadata !"0x101\00this\0011\000", metadata !16, metadata !2, metadata !32} ; [ DW_TAG_arg_variable ]
!32 = metadata !{metadata !"0x26\00\000\0064\0064\000\0064", metadata !47, metadata !2, metadata !33} ; [ DW_TAG_const_type ]
!33 = metadata !{metadata !"0xf\00\000\0064\0064\000\000", metadata !47, metadata !2, metadata !1} ; [ DW_TAG_pointer_type ]
!34 = metadata !{i32 11, i32 0, metadata !16, null}
!35 = metadata !{i32 11, i32 0, metadata !36, null}
!36 = metadata !{metadata !"0xb\0011\000\001", metadata !47, metadata !37} ; [ DW_TAG_lexical_block ]
!37 = metadata !{metadata !"0xb\0011\000\000", metadata !47, metadata !16} ; [ DW_TAG_lexical_block ]
!38 = metadata !{metadata !"0x100\00v\0024\000", metadata !39, metadata !2, metadata !1} ; [ DW_TAG_auto_variable ]
!39 = metadata !{metadata !"0xb\0023\000\004", metadata !47, metadata !40} ; [ DW_TAG_lexical_block ]
!40 = metadata !{metadata !"0xb\0023\000\003", metadata !47, metadata !20} ; [ DW_TAG_lexical_block ]
!41 = metadata !{i32 24, i32 0, metadata !39, null}
!42 = metadata !{i32 25, i32 0, metadata !39, null}
!43 = metadata !{i32 26, i32 0, metadata !39, null}
!44 = metadata !{metadata !"0x100\00k\0026\000", metadata !39, metadata !2, metadata !13} ; [ DW_TAG_auto_variable ]
!45 = metadata !{i32 27, i32 0, metadata !39, null}
!47 = metadata !{metadata !"small.cc", metadata !"/Users/manav/R8248330"}
!48 = metadata !{i32 0}
!49 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
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