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Debug info: If the RegisterCoalescer::reMaterializeTrivialDef() is

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eliminating all uses of a vreg, update any DBG_VALUE describing that vreg
to point to the rematerialized register instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223401 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl 2014-12-04 22:29:04 +00:00
parent 76b1313e75
commit fb8dcb45c6
2 changed files with 83 additions and 1 deletions
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14
lib/CodeGen/RegisterCoalescer.cpp
View File

@ -898,8 +898,20 @@ bool RegisterCoalescer::reMaterializeTrivialDef(CoalescerPair &CP,
// The source interval can become smaller because we removed a use.
LIS->shrinkToUses(&SrcInt, &DeadDefs);
if (!DeadDefs.empty())
if (!DeadDefs.empty()) {
// If the virtual SrcReg is completely eliminated, update all DBG_VALUEs
// to describe DstReg instead.
for (MachineRegisterInfo::use_iterator UI = MRI->use_begin(SrcReg),
UE = MRI->use_end(); UI != UE; ++UI) {
MachineOperand &UseMO = *UI;
MachineInstr *UseMI = UseMO.getParent();
if (UseMI->isDebugValue()) {
UseMO.setReg(DstReg);
DEBUG({dbgs() << "\t\tupdated: " << *UseMI;});
}
}
eliminateDeadDefs();
}
return true;
}

70
test/DebugInfo/AArch64/coalescing.ll Normal file
View File

@ -0,0 +1,70 @@
; RUN: llc -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
;
; Generated at -Os from:
; void *my_memcpy(void *dst, const void * src, long n);
; void* getBytesNoCopy();
; void start() {
; unsigned size;
; my_memcpy(&size, getBytesNoCopy(), sizeof(size));
; if (size != 0) { }
; }
; ModuleID = 'test1.cpp'
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-ios"
; Function Attrs: nounwind optsize
define void @_Z5startv() #0 {
entry:
%size = alloca i32, align 4
%0 = bitcast i32* %size to i8*, !dbg !15
%call = tail call i8* @_Z14getBytesNoCopyv() #3, !dbg !16
%call1 = call i8* @_Z9my_memcpyPvPKvl(i8* %0, i8* %call, i64 4) #3, !dbg !15
call void @llvm.dbg.value(metadata !{i32* %size}, i64 0, metadata !10, metadata !17), !dbg !18
; CHECK: .debug_info contents:
; CHECK: DW_TAG_variable
; CHECK-NEXT: DW_AT_location
; CHECK-NEXT: DW_AT_name {{.*}}"size"
; CHECK: .debug_loc contents:
; CHECK: Location description: 70 00
ret void, !dbg !19
}
; Function Attrs: optsize
declare i8* @_Z9my_memcpyPvPKvl(i8*, i8*, i64) #1
; Function Attrs: optsize
declare i8* @_Z14getBytesNoCopyv() #1
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
attributes #0 = { nounwind optsize }
attributes #1 = { optsize }
attributes #2 = { nounwind readnone }
attributes #3 = { nounwind optsize }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!12, !13}
!llvm.ident = !{!14}
!0 = metadata !{metadata !"0x11\004\00clang version 3.6.0 (trunk 223149) (llvm/trunk 223153)\001\00\000\00\001", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [/<stdin>] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"<stdin>", metadata !""}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{metadata !"0x2e\00start\00start\00_Z5startv\003\000\001\000\000\00256\001\004", metadata !5, metadata !6, metadata !7, null, void ()* @_Z5startv, null, null, metadata !9} ; [ DW_TAG_subprogram ] [line 3] [def] [scope 4] [start]
!5 = metadata !{metadata !"test1.cpp", metadata !""}
!6 = metadata !{metadata !"0x29", metadata !5} ; [ DW_TAG_file_type ] [/test1.cpp]
!7 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", null, null, null, metadata !8, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!8 = metadata !{null}
!9 = metadata !{metadata !10}
!10 = metadata !{metadata !"0x100\00size\005\000", metadata !4, metadata !6, metadata !11} ; [ DW_TAG_auto_variable ] [size] [line 5]
!11 = metadata !{metadata !"0x24\00unsigned int\000\0032\0032\000\000\007", null, null} ; [ DW_TAG_base_type ] [unsigned int] [line 0, size 32, align 32, offset 0, enc DW_ATE_unsigned]
!12 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
!13 = metadata !{i32 2, metadata !"Debug Info Version", i32 2}
!14 = metadata !{metadata !"clang version 3.6.0 (trunk 223149) (llvm/trunk 223153)"}
!15 = metadata !{i32 6, i32 3, metadata !4, null}
!16 = metadata !{i32 6, i32 25, metadata !4, null}
!17 = metadata !{metadata !"0x102"} ; [ DW_TAG_expression ]
!18 = metadata !{i32 5, i32 12, metadata !4, null}
!19 = metadata !{i32 9, i32 1, metadata !4, null}