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llvm-6502/test/CodeGen/ARM/debug-frame-vararg.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 -mtriple arm-unknown-linux-gnueabi -filetype asm -o - %s | FileCheck %s --check-prefix=CHECK-FP
; RUN: llc -mtriple arm-unknown-linux-gnueabi -filetype asm -o - %s -disable-fp-elim | FileCheck %s --check-prefix=CHECK-FP-ELIM
; RUN: llc -mtriple thumb-unknown-linux-gnueabi -filetype asm -o - %s | FileCheck %s --check-prefix=CHECK-THUMB-FP
; RUN: llc -mtriple thumb-unknown-linux-gnueabi -filetype asm -o - %s -disable-fp-elim | FileCheck %s --check-prefix=CHECK-THUMB-FP-ELIM
; Tests that the initial space allocated to the varargs on the stack is
; taken into account in the the .cfi_ directives.
; Generated from the C program:
; #include <stdarg.h>
;
; extern int foo(int);
;
; int sum(int count, ...) {
; va_list vl;
; va_start(vl, count);
; int sum = 0;
; for (int i = 0; i < count; i++) {
; sum += foo(va_arg(vl, int));
; }
; va_end(vl);
; }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!9, !10}
!llvm.ident = !{!11}
!0 = metadata !{metadata !"0x11\0012\00clang version 3.5 \000\00\000\00\000", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [/tmp/var.c] [DW_LANG_C99]
!1 = metadata !{metadata !"var.c", metadata !"/tmp"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{metadata !"0x2e\00sum\00sum\00\005\000\001\000\006\00256\000\005", metadata !1, metadata !5, metadata !6, null, i32 (i32, ...)* @sum, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 5] [def] [sum]
!5 = metadata !{metadata !"0x29", metadata !1} ; [ DW_TAG_file_type ] [/tmp/var.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 !{i32 2, metadata !"Dwarf Version", i32 4}
!10 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}
!11 = metadata !{metadata !"clang version 3.5 "}
!12 = metadata !{metadata !"0x101\00count\0016777221\000", metadata !4, metadata !5, metadata !8} ; [ DW_TAG_arg_variable ] [count] [line 5]
!13 = metadata !{i32 5, i32 0, metadata !4, null}
!14 = metadata !{metadata !"0x100\00vl\006\000", metadata !4, metadata !5, metadata !15} ; [ DW_TAG_auto_variable ] [vl] [line 6]
!15 = metadata !{metadata !"0x16\00va_list\0030\000\000\000\000", metadata !16, null, metadata !17} ; [ DW_TAG_typedef ] [va_list] [line 30, size 0, align 0, offset 0] [from __builtin_va_list]
!16 = metadata !{metadata !"/linux-x86_64-high/gcc_4.7.2/dbg/llvm/bin/../lib/clang/3.5/include/stdarg.h", metadata !"/tmp"}
!17 = metadata !{metadata !"0x16\00__builtin_va_list\006\000\000\000\000", metadata !1, null, metadata !18} ; [ DW_TAG_typedef ] [__builtin_va_list] [line 6, size 0, align 0, offset 0] [from __va_list]
!18 = metadata !{metadata !"0x13\00__va_list\006\0032\0032\000\000\000", metadata !1, null, null, metadata !19, null, null, null} ; [ DW_TAG_structure_type ] [__va_list] [line 6, size 32, align 32, offset 0] [def] [from ]
!19 = metadata !{metadata !20}
!20 = metadata !{metadata !"0xd\00__ap\006\0032\0032\000\000", metadata !1, metadata !18, metadata !21} ; [ DW_TAG_member ] [__ap] [line 6, size 32, align 32, offset 0] [from ]
!21 = metadata !{metadata !"0xf\00\000\0032\0032\000\000", null, null, null} ; [ DW_TAG_pointer_type ] [line 0, size 32, align 32, offset 0] [from ]
!22 = metadata !{i32 6, i32 0, metadata !4, null}
!23 = metadata !{i32 7, i32 0, metadata !4, null}
!24 = metadata !{metadata !"0x100\00sum\008\000", metadata !4, metadata !5, metadata !8} ; [ DW_TAG_auto_variable ] [sum] [line 8]
!25 = metadata !{i32 8, i32 0, metadata !4, null}
!26 = metadata !{metadata !"0x100\00i\009\000", metadata !27, metadata !5, metadata !8} ; [ DW_TAG_auto_variable ] [i] [line 9]
!27 = metadata !{metadata !"0xb\009\000\000", metadata !1, metadata !4} ; [ DW_TAG_lexical_block ] [/tmp/var.c]
!28 = metadata !{i32 9, i32 0, metadata !27, null}
!29 = metadata !{i32 10, i32 0, metadata !30, null}
!30 = metadata !{metadata !"0xb\009\000\001", metadata !1, metadata !27} ; [ DW_TAG_lexical_block ] [/tmp/var.c]
!31 = metadata !{i32 11, i32 0, metadata !30, null}
!32 = metadata !{i32 12, i32 0, metadata !4, null}
!33 = metadata !{i32 13, i32 0, metadata !4, null}
; CHECK-FP-LABEL: sum
; CHECK-FP: .cfi_startproc
; CHECK-FP: sub sp, sp, #16
; CHECK-FP: .cfi_def_cfa_offset 16
; CHECK-FP: push {r4, lr}
; CHECK-FP: .cfi_def_cfa_offset 24
; CHECK-FP: .cfi_offset lr, -20
; CHECK-FP: .cfi_offset r4, -24
; CHECK-FP: sub sp, sp, #8
; CHECK-FP: .cfi_def_cfa_offset 32
; CHECK-FP-ELIM-LABEL: sum
; CHECK-FP-ELIM: .cfi_startproc
; CHECK-FP-ELIM: sub sp, sp, #16
; CHECK-FP-ELIM: .cfi_def_cfa_offset 16
; CHECK-FP-ELIM: push {r4, r10, r11, lr}
; CHECK-FP-ELIM: .cfi_def_cfa_offset 32
; CHECK-FP-ELIM: .cfi_offset lr, -20
; CHECK-FP-ELIM: .cfi_offset r11, -24
; CHECK-FP-ELIM: .cfi_offset r10, -28
; CHECK-FP-ELIM: .cfi_offset r4, -32
; CHECK-FP-ELIM: add r11, sp, #8
; CHECK-FP-ELIM: .cfi_def_cfa r11, 24
; CHECK-THUMB-FP-LABEL: sum
; CHECK-THUMB-FP: .cfi_startproc
; CHECK-THUMB-FP: sub sp, #16
; CHECK-THUMB-FP: .cfi_def_cfa_offset 16
; CHECK-THUMB-FP: push {r4, r5, r7, lr}
; CHECK-THUMB-FP: .cfi_def_cfa_offset 32
; CHECK-THUMB-FP: .cfi_offset lr, -20
; CHECK-THUMB-FP: .cfi_offset r7, -24
; CHECK-THUMB-FP: .cfi_offset r5, -28
; CHECK-THUMB-FP: .cfi_offset r4, -32
; CHECK-THUMB-FP: sub sp, #8
; CHECK-THUMB-FP: .cfi_def_cfa_offset 40
; CHECK-THUMB-FP-ELIM-LABEL: sum
; CHECK-THUMB-FP-ELIM: .cfi_startproc
; CHECK-THUMB-FP-ELIM: sub sp, #16
; CHECK-THUMB-FP-ELIM: .cfi_def_cfa_offset 16
; CHECK-THUMB-FP-ELIM: push {r4, r5, r7, lr}
; CHECK-THUMB-FP-ELIM: .cfi_def_cfa_offset 32
; CHECK-THUMB-FP-ELIM: .cfi_offset lr, -20
; CHECK-THUMB-FP-ELIM: .cfi_offset r7, -24
; CHECK-THUMB-FP-ELIM: .cfi_offset r5, -28
; CHECK-THUMB-FP-ELIM: .cfi_offset r4, -32
; CHECK-THUMB-FP-ELIM: add r7, sp, #8
; CHECK-THUMB-FP-ELIM: .cfi_def_cfa r7, 24
define i32 @sum(i32 %count, ...) {
entry:
%vl = alloca i8*, align 4
%vl1 = bitcast i8** %vl to i8*
call void @llvm.va_start(i8* %vl1)
%cmp4 = icmp sgt i32 %count, 0
br i1 %cmp4, label %for.body, label %for.end
for.body: ; preds = %entry, %for.body
%i.05 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
%ap.cur = load i8** %vl, align 4
%ap.next = getelementptr i8* %ap.cur, i32 4
store i8* %ap.next, i8** %vl, align 4
%0 = bitcast i8* %ap.cur to i32*
%1 = load i32* %0, align 4
%call = call i32 @foo(i32 %1) #1
%inc = add nsw i32 %i.05, 1
%exitcond = icmp eq i32 %inc, %count
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
call void @llvm.va_end(i8* %vl1)
ret i32 undef
}
declare void @llvm.va_start(i8*) nounwind
declare i32 @foo(i32)
declare void @llvm.va_end(i8*) nounwind
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