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X86: Use StackRegister instead of FrameRegister in getFrameIndexReference (to generate debug info for local variables) if stack needs realignment

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155917 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2012-05-01 15:16:06 +00:00
parent 0998627b24
commit d07d06ceef
3 changed files with 56 additions and 0 deletions
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12
lib/Target/X86/X86FrameLowering.cpp
View File

@ -1174,6 +1174,18 @@ int X86FrameLowering::getFrameIndexOffset(const MachineFunction &MF, int FI) con
return Offset;
}
int X86FrameLowering::getFrameIndexReference(const MachineFunction &MF, int FI,
unsigned &FrameReg) const {
const X86RegisterInfo *RI =
static_cast<const X86RegisterInfo*>(MF.getTarget().getRegisterInfo());
// We can't calculate offset from frame pointer if the stack is realigned,
// so enforce usage of stack pointer.
FrameReg = (RI->needsStackRealignment(MF)) ? RI->getStackRegister()
: RI->getFrameRegister(MF);
return getFrameIndexOffset(MF, FI);
}
bool X86FrameLowering::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI,

2
lib/Target/X86/X86FrameLowering.h
View File

@ -60,6 +60,8 @@ public:
bool hasReservedCallFrame(const MachineFunction &MF) const;
int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
int getFrameIndexReference(const MachineFunction &MF, int FI,
unsigned &FrameReg) const;
uint32_t getCompactUnwindEncoding(MachineFunction &MF) const;
};

42
test/DebugInfo/X86/aligned_stack_var.ll Normal file
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@ -0,0 +1,42 @@
; RUN: llc %s -mtriple=x86_64-pc-linux-gnu -O0 -filetype=obj -o %t
; RUN: llvm-dwarfdump %t | FileCheck %s
; If stack is realigned, we shouldn't describe locations of local
; variables by giving offset from the frame pointer (%rbp):
; push %rpb
; mov %rsp,%rbp
; and ALIGNMENT,%rsp ; (%rsp and %rbp are different now)
; It's better to use offset from %rsp instead.
; DW_AT_location of variable "x" shouldn't be equal to
; (DW_OP_fbreg: .*): DW_OP_fbreg has code 0x91
; CHECK: {{0x.* DW_TAG_variable}}
; CHECK-NOT: {{DW_AT_location.*DW_FORM_block1.*0x.*91}}
; CHECK: NULL
define void @_Z3runv() nounwind uwtable {
entry:
%x = alloca i32, align 32
call void @llvm.dbg.declare(metadata !{i32* %x}, metadata !9), !dbg !12
ret void, !dbg !13
}
declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
!llvm.dbg.cu = !{!0}
!0 = metadata !{i32 786449, i32 0, i32 4, metadata !"test.cc", metadata !"/home/samsonov/debuginfo", metadata !"clang version 3.2 (trunk 155696:155697) (llvm/trunk 155696)", i1 true, i1 false, metadata !"", i32 0, metadata !1, metadata !1, metadata !3, metadata !1} ; [ DW_TAG_compile_unit ]
!1 = metadata !{metadata !2}
!2 = metadata !{i32 0}
!3 = metadata !{metadata !4}
!4 = metadata !{metadata !5}
!5 = metadata !{i32 786478, i32 0, metadata !6, metadata !"run", metadata !"run", metadata !"_Z3runv", metadata !6, i32 1, metadata !7, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void ()* @_Z3runv, null, null, metadata !1, i32 1} ; [ DW_TAG_subprogram ]
!6 = metadata !{i32 786473, metadata !"test.cc", metadata !"/home/samsonov/debuginfo", null} ; [ DW_TAG_file_type ]
!7 = metadata !{i32 786453, i32 0, metadata !"", i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !8, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
!8 = metadata !{null}
!9 = metadata !{i32 786688, metadata !10, metadata !"x", metadata !6, i32 2, metadata !11, i32 0, i32 0} ; [ DW_TAG_auto_variable ]
!10 = metadata !{i32 786443, metadata !5, i32 1, i32 12, metadata !6, i32 0} ; [ DW_TAG_lexical_block ]
!11 = metadata !{i32 786468, null, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
!12 = metadata !{i32 2, i32 7, metadata !10, null}
!13 = metadata !{i32 3, i32 1, metadata !10, null}