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155 lines
8.1 KiB
155 lines
8.1 KiB
4 months ago
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# These tests check that DBG_VALUE intervals are correctly coalesced (or not) in
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# LiveDebugVariables.
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# NOTE: We do not currently handle partially overlapping fragments in LDV.
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#
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# The IR in this file has been modified by hand, generated from this source:
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# void escape(int *);
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# extern int global;
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# void f(int x) {
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# escape(&x);
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# x = 1;
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# global = x;
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# x = 2;
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# escape(&x);
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# }
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# RUN: llc %s -start-before=machine-scheduler -stop-after=virtregrewriter -o - \
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# RUN: | FileCheck %s --implicit-check-not=DBG_VALUE
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# Verify that DBG_VALUEs with same { Variable, Fragment } but different DIExpressions
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# are not coalesced.
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#
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# DV1 %0 "x" (deref) --+-- Do not coalesce these because DV2 refers to the same bits.
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# DV2 %0 "x" () |
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# DV3 %0 "x" (deref) --+
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#
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# CHECK: name: f1
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# CHECK: DBG_VALUE %stack.0.x.addr, $noreg, ![[VAR:[0-9]+]], !DIExpression(DW_OP_deref)
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# CHECK: DBG_VALUE %stack.0.x.addr, $noreg, ![[VAR]], !DIExpression()
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# CHECK: DBG_VALUE %stack.0.x.addr, $noreg, ![[VAR]], !DIExpression(DW_OP_deref)
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# Verify that DBG_VALUEs with same { Variable, Fragment } and { Location, DIExpression } are
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# coalesced if there are no intervening DBG_VALUEs with the same { Variable, Fragment }.
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#
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# DV1 %0 "x" (fragment 00 16) --+-- Coalesce these because DV2 refers to different bits.
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# DV2 %0 "x" (fragment 16 16) |
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# DV3 %0 "x" (fragment 00 16) --+
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#
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# CHECK: name: f2
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# CHECK: DBG_VALUE %stack.0.x.addr, $noreg, ![[VAR:[0-9]+]], !DIExpression(DW_OP_deref, DW_OP_LLVM_fragment, 0, 16)
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# CHECK: DBG_VALUE %stack.0.x.addr, $noreg, ![[VAR]], !DIExpression(DW_OP_LLVM_fragment, 16, 16)
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--- |
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target triple = "x86_64-unknown-linux-gnu"
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@global = external global i32, align 4
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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declare void @escape(i32*)
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define void @f1(i32 %x) !dbg !6 {
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entry:
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%x.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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call void @llvm.dbg.value(metadata i32* %x.addr, metadata !11, metadata !DIExpression(DW_OP_deref)), !dbg !12
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call void @escape(i32* %x.addr), !dbg !12
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call void @llvm.dbg.value(metadata i32* %x.addr, metadata !11, metadata !DIExpression()), !dbg !12
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store i32 1, i32* @global, align 4, !dbg !12
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call void @llvm.dbg.value(metadata i32* %x.addr, metadata !11, metadata !DIExpression(DW_OP_deref)), !dbg !12
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store i32 2, i32* %x.addr, align 4, !dbg !12
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call void @escape(i32* %x.addr), !dbg !12
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ret void, !dbg !12
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}
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define void @f2(i32 %x) !dbg !13 {
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entry:
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%x.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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call void @llvm.dbg.value(metadata i32* %x.addr, metadata !14, metadata !DIExpression(DW_OP_deref, DW_OP_LLVM_fragment, 0, 16)), !dbg !15
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call void @escape(i32* %x.addr)
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call void @llvm.dbg.value(metadata i32* %x.addr, metadata !14, metadata !DIExpression(DW_OP_LLVM_fragment, 16, 16)), !dbg !15
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store i32 1, i32* @global, align 4
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call void @llvm.dbg.value(metadata i32* %x.addr, metadata !14, metadata !DIExpression(DW_OP_deref, DW_OP_LLVM_fragment, 0, 16)), !dbg !15
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store i32 2, i32* %x.addr, align 4
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call void @escape(i32* %x.addr)
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ret void
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 11.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{!"clang version 11.0.0 "}
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!6 = distinct !DISubprogram(name: "f1", scope: !1, file: !1, line: 3, type: !7, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9}
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !{!11}
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!11 = !DILocalVariable(name: "x", arg: 1, scope: !6, file: !1, line: 3, type: !9)
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!12 = !DILocation(line: 3, column: 12, scope: !6)
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!13 = distinct !DISubprogram(name: "f2", scope: !1, file: !1, line: 20, type: !7, scopeLine: 20, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10)
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!14 = !DILocalVariable(name: "x", arg: 1, scope: !13, file: !1, line: 21, type: !9)
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!15 = !DILocation(line: 23, column: 12, scope: !13)
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...
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---
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name: f1
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tracksRegLiveness: true
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stack:
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- { id: 0, name: x.addr, type: default, offset: 0, size: 4, alignment: 4,
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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.entry:
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liveins: $edi
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%0:gr32 = COPY $edi
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MOV32mr %stack.0.x.addr, 1, $noreg, 0, $noreg, %0 :: (store 4 into %ir.x.addr)
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DBG_VALUE %stack.0.x.addr, $noreg, !11, !DIExpression(DW_OP_deref), debug-location !12
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ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !12
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%1:gr64 = LEA64r %stack.0.x.addr, 1, $noreg, 0, $noreg
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$rdi = COPY %1, debug-location !12
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CALL64pcrel32 @escape, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, debug-location !12
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ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !12
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DBG_VALUE %stack.0.x.addr, $noreg, !11, !DIExpression(), debug-location !12
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MOV32mi $rip, 1, $noreg, @global, $noreg, 1, debug-location !12 :: (store 4 into @global)
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DBG_VALUE %stack.0.x.addr, $noreg, !11, !DIExpression(DW_OP_deref), debug-location !12
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MOV32mi %stack.0.x.addr, 1, $noreg, 0, $noreg, 2, debug-location !12 :: (store 4 into %ir.x.addr)
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ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !12
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$rdi = COPY %1, debug-location !12
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CALL64pcrel32 @escape, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, debug-location !12
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ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !12
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RET 0, debug-location !12
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...
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---
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name: f2
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tracksRegLiveness: true
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stack:
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- { id: 0, name: x.addr, type: default, offset: 0, size: 4, alignment: 4,
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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.entry:
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liveins: $edi
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%0:gr32 = COPY $edi
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MOV32mr %stack.0.x.addr, 1, $noreg, 0, $noreg, %0 :: (store 4 into %ir.x.addr)
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DBG_VALUE %stack.0.x.addr, $noreg, !14, !DIExpression(DW_OP_deref, DW_OP_LLVM_fragment, 0, 16), debug-location !15
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ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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%1:gr64 = LEA64r %stack.0.x.addr, 1, $noreg, 0, $noreg
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$rdi = COPY %1
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CALL64pcrel32 @escape, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp
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ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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DBG_VALUE %stack.0.x.addr, $noreg, !14, !DIExpression(DW_OP_LLVM_fragment, 16, 16), debug-location !15
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MOV32mi $rip, 1, $noreg, @global, $noreg, 1 :: (store 4 into @global)
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DBG_VALUE %stack.0.x.addr, $noreg, !14, !DIExpression(DW_OP_deref, DW_OP_LLVM_fragment, 0, 16), debug-location !15
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MOV32mi %stack.0.x.addr, 1, $noreg, 0, $noreg, 2 :: (store 4 into %ir.x.addr)
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ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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$rdi = COPY %1
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CALL64pcrel32 @escape, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp
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ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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RET 0
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...
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