llvm/test/DebugInfo/X86/vla.ll

; RUN: llc -O0 -mtriple=x86_64-apple-darwin -filetype=asm %s -o - | FileCheck %s
; Ensure that we generate an indirect location for the variable length array a.
; CHECK: ##DEBUG_VALUE: vla:a <- RDX
; CHECK: DW_OP_breg1
; rdar://problem/13658587
;
; generated from:
;
; int vla(int n) {
;   int a[n];
;   a[0] = 42;
;   return a[n-1];
; }
;
; int main(int argc, char** argv) {
;    return vla(argc);
; }

; ModuleID = 'vla.c'
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.8.0"

; Function Attrs: nounwind ssp uwtable
define i32 @vla(i32 %n) nounwind ssp uwtable {
entry:
  %n.addr = alloca i32, align 4
  %saved_stack = alloca i8*
  %cleanup.dest.slot = alloca i32
  store i32 %n, i32* %n.addr, align 4
  call void @llvm.dbg.declare(metadata i32* %n.addr, metadata !15, metadata !{!"0x102"}), !dbg !16
  %0 = load i32, i32* %n.addr, align 4, !dbg !17
  %1 = zext i32 %0 to i64, !dbg !17
  %2 = call i8* @llvm.stacksave(), !dbg !17
  store i8* %2, i8** %saved_stack, !dbg !17
  %vla = alloca i32, i64 %1, align 16, !dbg !17
  call void @llvm.dbg.declare(metadata i32* %vla, metadata !18, metadata !{!"0x102\006"}), !dbg !17
  %arrayidx = getelementptr inbounds i32, i32* %vla, i64 0, !dbg !22
  store i32 42, i32* %arrayidx, align 4, !dbg !22
  %3 = load i32, i32* %n.addr, align 4, !dbg !23
  %sub = sub nsw i32 %3, 1, !dbg !23
  %idxprom = sext i32 %sub to i64, !dbg !23
  %arrayidx1 = getelementptr inbounds i32, i32* %vla, i64 %idxprom, !dbg !23
  %4 = load i32, i32* %arrayidx1, align 4, !dbg !23
  store i32 1, i32* %cleanup.dest.slot
  %5 = load i8*, i8** %saved_stack, !dbg !24
  call void @llvm.stackrestore(i8* %5), !dbg !24
  ret i32 %4, !dbg !23
}

; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone

; Function Attrs: nounwind
declare i8* @llvm.stacksave() nounwind

; Function Attrs: nounwind
declare void @llvm.stackrestore(i8*) nounwind

; Function Attrs: nounwind ssp uwtable
define i32 @main(i32 %argc, i8** %argv) nounwind ssp uwtable {
entry:
  %retval = alloca i32, align 4
  %argc.addr = alloca i32, align 4
  %argv.addr = alloca i8**, align 8
  store i32 0, i32* %retval
  store i32 %argc, i32* %argc.addr, align 4
  call void @llvm.dbg.declare(metadata i32* %argc.addr, metadata !25, metadata !{!"0x102"}), !dbg !26
  store i8** %argv, i8*** %argv.addr, align 8
  call void @llvm.dbg.declare(metadata i8*** %argv.addr, metadata !27, metadata !{!"0x102"}), !dbg !26
  %0 = load i32, i32* %argc.addr, align 4, !dbg !28
  %call = call i32 @vla(i32 %0), !dbg !28
  ret i32 %call, !dbg !28
}

!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!29}

!0 = !{!"0x11\0012\00clang version 3.3 \000\00\000\00\001", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/vla.c] [DW_LANG_C99]
!1 = !{!"vla.c", !""}
!2 = !{}
!3 = !{!4, !9}
!4 = !{!"0x2e\00vla\00vla\00\001\000\001\000\006\00256\000\001", !1, !5, !6, null, i32 (i32)* @vla, null, null, !2} ; [ DW_TAG_subprogram ] [line 1] [def] [vla]
!5 = !{!"0x29", !1}          ; [ DW_TAG_file_type ] [/vla.c]
!6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!7 = !{!8, !8}
!8 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!9 = !{!"0x2e\00main\00main\00\007\000\001\000\006\00256\000\007", !1, !5, !10, null, i32 (i32, i8**)* @main, null, null, !2} ; [ DW_TAG_subprogram ] [line 7] [def] [main]
!10 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !11, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!11 = !{!8, !8, !12}
!12 = !{!"0xf\00\000\0064\0064\000\000", null, null, !13} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
!13 = !{!"0xf\00\000\0064\0064\000\000", null, null, !14} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from char]
!14 = !{!"0x24\00char\000\008\008\000\000\006", null, null} ; [ DW_TAG_base_type ] [char] [line 0, size 8, align 8, offset 0, enc DW_ATE_signed_char]
!15 = !{!"0x101\00n\0016777217\000", !4, !5, !8} ; [ DW_TAG_arg_variable ] [n] [line 1]
!16 = !MDLocation(line: 1, scope: !4)
!17 = !MDLocation(line: 2, scope: !4)
!18 = !{!"0x100\00a\002\000", !4, !5, !19} ; [ DW_TAG_auto_variable ] [a] [line 2]
!19 = !{!"0x1\00\000\000\0032\000\000", null, null, !8, !20, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 0, align 32, offset 0] [from int]
!20 = !{!21}
!21 = !{!"0x21\000\00-1"}       ; [ DW_TAG_subrange_type ] [unbounded]
!22 = !MDLocation(line: 3, scope: !4)
!23 = !MDLocation(line: 4, scope: !4)
!24 = !MDLocation(line: 5, scope: !4)
!25 = !{!"0x101\00argc\0016777223\000", !9, !5, !8} ; [ DW_TAG_arg_variable ] [argc] [line 7]
!26 = !MDLocation(line: 7, scope: !9)
!27 = !{!"0x101\00argv\0033554439\000", !9, !5, !12} ; [ DW_TAG_arg_variable ] [argv] [line 7]
!28 = !MDLocation(line: 8, scope: !9)
!29 = !{i32 1, !"Debug Info Version", i32 2}