# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
# RUN: -experimental-debug-variable-locations -run-pass=livedebugvalues\
# RUN: | FileCheck %s
#
# Test that a DBG_INSTR_REF that refers to a DBG_PHI, will be translated into a
# DBG_VALUE of the value read at that DBG_PHI -- in this test, when the value
# is on the stack.
#
--- |
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 {
ret i32 0
}
declare dso_local void @ext(i64)
declare dso_local i64 @getlong()
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/tmp/out.c")
!2 = !{}
!3 = !{i32 7, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!""}
!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !11, !11}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
!12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
!13 = !DILocation(line: 0, scope: !7)
!14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
!19 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)
!26 = !DILocation(line: 13, column: 3, scope: !7)
...
---
name: foo
alignment: 16
tracksRegLiveness: true
debugInstrRef: true
liveins:
- { reg: '$rdi' }
- { reg: '$rsi' }
frameInfo:
stackSize: 24
offsetAdjustment: -24
maxAlignment: 1
adjustsStack: true
hasCalls: true
maxCallFrameSize: 0
cvBytesOfCalleeSavedRegisters: 16
fixedStack:
- { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$rbx' }
- { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$r14' }
machineFunctionInfo: {}
stack:
- { id: 0, name: '', type: spill-slot, offset: 0, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
body: |
bb.0:
liveins: $rdi, $rsi, $r14, $rbx
; CHECK-LABEL: bb.0:
$r14 = MOV64rr $rsi
$rbx = MOV64rr $rdi
$rax = MOV64ri 0
MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0)
$rax = MOV64ri 0
;; A DBG_PHI of the stack should resolve to the stack location.
DBG_PHI %stack.0, 1, 64
;; Reload value, clobber stack location.
$rcx = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0)
MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0)
;; This should resolve to the loaded register.
DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $rcx
;; And if we say it's a smaller size, we should be able to pick out smaller
;; subregisters within the stack slot.
DBG_PHI %stack.0, 2, 32
$rax = MOV64ri 0
$rcx = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0)
MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0)
;; This should pick out the 32 bit value.
DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $ecx
;; Try all the other subregs.
DBG_PHI %stack.0, 3, 16
$rax = MOV64ri 0
$rcx = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0)
MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0)
DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !13
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(3, 0)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $cx
DBG_PHI %stack.0, 4, 8
$rax = MOV64ri 0
$rcx = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0)
MOV64mr $rsp, 1, $noreg, 16, $noreg, $rax :: (store 8 into %stack.0)
DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(4, 0), debug-location !13
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(4, 0)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $cl
;; We can't, at this time, describe subregister fields with nonzero offset.
;; It's easily achieved by attaching more data to stack DBG_PHIs, but it's
;; not clear that LLVM will ever merge registers to generate such locations.
RET64 implicit $eax, debug-location !26
...
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