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