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llvm-mirror/test/DebugInfo/X86/prolog-params.mir
David Stenberg bc0369a7b7 [DebugInfo] Keep parameter DBG_VALUEs before prologue code 
Summary:
This is a preparatory change for removing the code from
DebugHandlerBase::beginFunction() which changes the starting label for
the first non-overlapping DBG_VALUEs of parameters to the beginning of
the function. It does that to be able to show parameters when entering a
function. However, that code does not consider what defines the values,
which can result in the ranges for the debug values starting before
their defining instructions. That code is removed in a follow-up patch.

When prologue code is inserted, it leads to DBG_VALUEs that start
directly in the entry block being moved down after the prologue
instructions. This patch fixes that by stashing away DBG_VALUEs for
parameters before emitting the prologue, and then reinserts them at the
start of the block. This assumes that there is no target that somehow
clobbers parameter registers in the frame setup; there is no such case
in the lit tests at least.

See PR40188 for more information.

Reviewers: aprantl, dblaikie, rnk, jmorse

Reviewed By: aprantl

Subscribers: bjope, llvm-commits

Tags: #debug-info

Differential Revision: https://reviews.llvm.org/D57510

llvm-svn: 353823
2019-02-12 10:51:27 +00:00

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# RUN: llc -mtriple=x86_64-unknown-linux-gnu -run-pass=prologepilog %s -o - | FileCheck %s
# MIR test case produced by compiling:
#
# typedef struct { int a; long b; } S1;
#
# extern void bar(int *);
#
# void foo(int p1, S1 p2, int p3, int p4, int p5, int p6, int p7, int p8) {
# int local1 = p1;
# int local2 = p6;
# int arr[2];
# bar(arr);
# }
#
# using the following commands (with some manual stripping of metadata):
#
# $ clang -O1 -g -S -emit-llvm
# $ llc -O1 -stop-before=prologepilog
--- |
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: nounwind uwtable
define dso_local void @foo(i32 %p1, i32 %p2.coerce0, i64 %p2.coerce1, i32 %p3, i32 %p4, i32 %p5, i32 %p6, i32 %p7, i32 %p8) local_unnamed_addr #0 !dbg !7 {
entry:
%arr = alloca [2 x i32], align 4
call void @llvm.dbg.value(metadata i32 %p1, metadata !18, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %p2.coerce0, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !28
call void @llvm.dbg.value(metadata i64 %p2.coerce1, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)), !dbg !28
call void @llvm.dbg.value(metadata i32 %p3, metadata !20, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %p4, metadata !21, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %p5, metadata !22, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %p6, metadata !23, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %p7, metadata !24, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %p8, metadata !25, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %p1, metadata !26, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %p6, metadata !27, metadata !DIExpression()), !dbg !28
%arraydecay1 = bitcast [2 x i32]* %arr to i32*, !dbg !28
call void @bar(i32* nonnull %arraydecay1), !dbg !28
ret void, !dbg !28
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare dso_local void @bar(i32*) local_unnamed_addr
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind readnone speculatable }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "params.c", directory: "/")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 9.0.0"}
!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !17)
!8 = !DISubroutineType(types: !9)
!9 = !{null, !10, !11, !10, !10, !10, !10, !10, !10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "S1", file: !1, line: 1, baseType: !12)
!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !1, line: 1, size: 128, elements: !13)
!13 = !{!14, !15}
!14 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !12, file: !1, line: 1, baseType: !10, size: 32)
!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !12, file: !1, line: 1, baseType: !16, size: 64, offset: 64)
!16 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
!17 = !{!18, !19, !20, !21, !22, !23, !24, !25, !26, !27}
!18 = !DILocalVariable(name: "p1", arg: 1, scope: !7, file: !1, line: 5, type: !10)
!19 = !DILocalVariable(name: "p2", arg: 2, scope: !7, file: !1, line: 5, type: !11)
!20 = !DILocalVariable(name: "p3", arg: 3, scope: !7, file: !1, line: 5, type: !10)
!21 = !DILocalVariable(name: "p4", arg: 4, scope: !7, file: !1, line: 5, type: !10)
!22 = !DILocalVariable(name: "p5", arg: 5, scope: !7, file: !1, line: 5, type: !10)
!23 = !DILocalVariable(name: "p6", arg: 6, scope: !7, file: !1, line: 5, type: !10)
!24 = !DILocalVariable(name: "p7", arg: 7, scope: !7, file: !1, line: 5, type: !10)
!25 = !DILocalVariable(name: "p8", arg: 8, scope: !7, file: !1, line: 5, type: !10)
!26 = !DILocalVariable(name: "local1", scope: !7, file: !1, line: 6, type: !10)
!27 = !DILocalVariable(name: "local2", scope: !7, file: !1, line: 7, type: !10)
!28 = !DILocation(line: 5, column: 21, scope: !7)
...
---
name: foo
tracksRegLiveness: true
fixedStack:
- { id: 0, type: default, offset: 16, size: 4, alignment: 16, stack-id: 0,
isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true }
- { id: 1, type: default, offset: 8, size: 4, alignment: 8, stack-id: 0,
isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true }
- { id: 2, type: default, offset: 0, size: 4, alignment: 16, stack-id: 0,
isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true }
stack:
- { id: 0, name: arr, type: default, offset: 0, size: 8, alignment: 4,
stack-id: 0, callee-saved-register: '', callee-saved-restored: true }
body: |
bb.0.entry:
DBG_VALUE $edi, $noreg, !18, !DIExpression(), debug-location !28
DBG_VALUE $esi, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 0, 32), debug-location !28
DBG_VALUE $rdx, $noreg, !19, !DIExpression(DW_OP_LLVM_fragment, 64, 64), debug-location !28
DBG_VALUE $ecx, $noreg, !20, !DIExpression(), debug-location !28
DBG_VALUE $r8d, $noreg, !21, !DIExpression(), debug-location !28
DBG_VALUE %fixed-stack.2, 0, !23, !DIExpression(), debug-location !28
DBG_VALUE $r9d, $noreg, !22, !DIExpression(), debug-location !28
DBG_VALUE $r9d, $noreg, !23, !DIExpression(), debug-location !28
DBG_VALUE %fixed-stack.1, 0, !24, !DIExpression(), debug-location !28
DBG_VALUE %fixed-stack.0, 0, !25, !DIExpression(), debug-location !28
DBG_VALUE $edi, $noreg, !26, !DIExpression(), debug-location !28
DBG_VALUE %fixed-stack.2, 0, !27, !DIExpression(), debug-location !28
ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !28
renamable $rdi = LEA64r %stack.0.arr, 1, $noreg, 0, $noreg
CALL64pcrel32 @bar, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, debug-location !28
ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !28
RET 0, debug-location !28
...
# CHECK: ![[P1:.*]] = !DILocalVariable(name: "p1"
# CHECK: ![[P2:.*]] = !DILocalVariable(name: "p2"
# CHECK: ![[P3:.*]] = !DILocalVariable(name: "p3"
# CHECK: ![[P4:.*]] = !DILocalVariable(name: "p4"
# CHECK: ![[P5:.*]] = !DILocalVariable(name: "p5"
# CHECK: ![[P6:.*]] = !DILocalVariable(name: "p6"
# CHECK: ![[P7:.*]] = !DILocalVariable(name: "p7"
# CHECK: ![[P8:.*]] = !DILocalVariable(name: "p8"
# CHECK: ![[LOCAL1:.*]] = !DILocalVariable(name: "local1"
# CHECK: ![[LOCAL2:.*]] = !DILocalVariable(name: "local2"
# Please note that an additional DBG_VALUE has been added for p6 to see that
# FI- and register-described DBG_VALUEs for the same variable are not reordered.
# Parameters passed in registers are emitted before the prologue code.
# CHECK: bb.0.entry:
# CHECK-NEXT: DBG_VALUE $edi, $noreg, ![[P1]], !DIExpression()
# CHECK-NEXT: DBG_VALUE $esi, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_fragment, 0, 32)
# CHECK-NEXT: DBG_VALUE $rdx, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_fragment, 64, 64)
# CHECK-NEXT: DBG_VALUE $ecx, $noreg, ![[P3]], !DIExpression()
# CHECK-NEXT: DBG_VALUE $r8d, $noreg, ![[P4]], !DIExpression()
# CHECK-NEXT: DBG_VALUE $r9d, $noreg, ![[P5]], !DIExpression()
# CHECK-NEXT: frame-setup PUSH64r
# Locals and stack parameters are emitted after the prologue code.
# CHECK: DBG_VALUE $rsp, 0, ![[P6]], !DIExpression(DW_OP_plus_uconst, 16)
# CHECK-NEXT: DBG_VALUE $r9d, $noreg, ![[P6]], !DIExpression()
# CHECK-NEXT: DBG_VALUE $rsp, 0, ![[P7]], !DIExpression(DW_OP_plus_uconst, 24)
# CHECK-NEXT: DBG_VALUE $rsp, 0, ![[P8]], !DIExpression(DW_OP_plus_uconst, 32)
# CHECK-NEXT: DBG_VALUE $edi, $noreg, ![[LOCAL1]], !DIExpression()
# CHECK-NEXT: DBG_VALUE $rsp, 0, ![[LOCAL2]], !DIExpression(DW_OP_plus_uconst, 16)
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