1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
; 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 !{metadata !"0x102"}), !dbg !16
%0 = load 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 !{metadata !"0x102"}), !dbg !17
%arrayidx = getelementptr inbounds i32* %vla, i64 0, !dbg !22
store i32 42, i32* %arrayidx, align 4, !dbg !22
%3 = load 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* %vla, i64 %idxprom, !dbg !23
%4 = load i32* %arrayidx1, align 4, !dbg !23
store i32 1, i32* %cleanup.dest.slot
%5 = load 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 !{metadata !"0x102"}), !dbg !26
store i8** %argv, i8*** %argv.addr, align 8
call void @llvm.dbg.declare(metadata !{i8*** %argv.addr}, metadata !27, metadata !{metadata !"0x102"}), !dbg !26
%0 = load 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 = metadata !{metadata !"0x11\0012\00clang version 3.3 \000\00\000\00\001", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [/vla.c] [DW_LANG_C99]
!1 = metadata !{metadata !"vla.c", metadata !""}
!2 = metadata !{}
!3 = metadata !{metadata !4, metadata !9}
!4 = metadata !{metadata !"0x2e\00vla\00vla\00\001\000\001\000\006\00256\000\001", metadata !1, metadata !5, metadata !6, null, i32 (i32)* @vla, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 1] [def] [vla]
!5 = metadata !{metadata !"0x29", metadata !1} ; [ DW_TAG_file_type ] [/vla.c]
!6 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!7 = metadata !{metadata !8, metadata !8}
!8 = metadata !{metadata !"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 = metadata !{metadata !"0x2e\00main\00main\00\007\000\001\000\006\00256\000\007", metadata !1, metadata !5, metadata !10, null, i32 (i32, i8**)* @main, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 7] [def] [main]
!10 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !11, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!11 = metadata !{metadata !8, metadata !8, metadata !12}
!12 = metadata !{metadata !"0xf\00\000\0064\0064\000\000", null, null, metadata !13} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
!13 = metadata !{metadata !"0xf\00\000\0064\0064\000\000", null, null, metadata !14} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from char]
!14 = metadata !{metadata !"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 = metadata !{metadata !"0x101\00n\0016777217\000", metadata !4, metadata !5, metadata !8} ; [ DW_TAG_arg_variable ] [n] [line 1]
!16 = metadata !{i32 1, i32 0, metadata !4, null}
!17 = metadata !{i32 2, i32 0, metadata !4, null}
!18 = metadata !{metadata !"0x100\00a\002\008192", metadata !4, metadata !5, metadata !19} ; [ DW_TAG_auto_variable ] [a] [line 2]
!19 = metadata !{metadata !"0x1\00\000\000\0032\000\000", null, null, metadata !8, metadata !20, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 0, align 32, offset 0] [from int]
!20 = metadata !{metadata !21}
!21 = metadata !{metadata !"0x21\000\00-1"} ; [ DW_TAG_subrange_type ] [unbounded]
!22 = metadata !{i32 3, i32 0, metadata !4, null}
!23 = metadata !{i32 4, i32 0, metadata !4, null}
!24 = metadata !{i32 5, i32 0, metadata !4, null}
!25 = metadata !{metadata !"0x101\00argc\0016777223\000", metadata !9, metadata !5, metadata !8} ; [ DW_TAG_arg_variable ] [argc] [line 7]
!26 = metadata !{i32 7, i32 0, metadata !9, null}
!27 = metadata !{metadata !"0x101\00argv\0033554439\000", metadata !9, metadata !5, metadata !12} ; [ DW_TAG_arg_variable ] [argv] [line 7]
!28 = metadata !{i32 8, i32 0, metadata !9, null}
!29 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
|
