c383f4d655
Prior to this patch, variadic DIExpressions (i.e. ones that contain DW_OP_LLVM_arg) could only be created by salvaging debug values to create stack value expressions, resulting in a DBG_VALUE_LIST being created. As of the previous patch in this patch stack, DBG_INSTR_REF's syntax has been changed to match DBG_VALUE_LIST in preparation for supporting variadic expressions. This patch adds some minor changes needed to allow variadic expressions that aren't stack values to exist, and allows variadic expressions that are trivially reduceable to non-variadic expressions to be handled similarly to non-variadic expressions. Reviewed by: jmorse Differential Revision: https://reviews.llvm.org/D133926
156 lines
6.2 KiB
YAML
156 lines
6.2 KiB
YAML
# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
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# RUN: -experimental-debug-variable-locations \
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# RUN: -start-before=phi-node-elimination -stop-after=virtregrewriter \
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# RUN: | FileCheck %s
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#
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# Pass a PHI node into register allocation, and test that it is correctly
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# dropped. In this test the desired value is an 8 bit copy of an argument,
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# but it's located in an upper subregister field. That coalesces back to the
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# whole argument, which is spilt to the stack.
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#
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# Currently, DBG_PHIs can't describe non-zero offsets in stack slots, therefore
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# no DBG_PHI should be emitted. (This means there is no value for that
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# instruction/operand number, and any DBG_INSTR_REF will become a
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# DBG_VALUE $noreg.
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--- |
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; ModuleID = 'promoted.ll'
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source_filename = "test.c"
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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(i32 %bar, i32 %baz) !dbg !7 {
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entry:
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ret i32 0, !dbg !19
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}
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declare dso_local i32 @ext(i32)
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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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, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: ".")
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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: 2, type: !8, scopeLine: 2, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 2, type: !10)
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!12 = !DILocation(line: 0, scope: !7)
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!13 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 2, type: !10)
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!14 = !DILocalVariable(name: "either", scope: !7, file: !1, line: 3, type: !10)
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!15 = !DILocation(line: 4, column: 7, scope: !16)
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!16 = distinct !DILexicalBlock(scope: !7, file: !1, line: 4, column: 7)
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!17 = !DILocation(line: 4, column: 7, scope: !7)
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!18 = !DILocation(line: 0, scope: !16)
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!19 = !DILocation(line: 9, 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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registers:
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- { id: 0, class: gr8 }
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- { id: 1, class: gr32_abcd }
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- { id: 2, class: gr32_abcd }
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- { id: 3, class: gr32 }
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- { id: 4, class: gr32 }
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liveins:
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- { reg: '$edi', virtual-reg: '%1' }
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- { reg: '$esi', virtual-reg: '%2' }
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frameInfo:
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maxAlignment: 1
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hasCalls: true
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machineFunctionInfo: {}
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body: |
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bb.0:
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successors: %bb.2(0x50000000), %bb.1(0x30000000)
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liveins: $edi, $esi
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DBG_VALUE $edi, $noreg, !11, !DIExpression(), debug-location !12
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DBG_VALUE $esi, $noreg, !13, !DIExpression(), debug-location !12
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%2:gr32_abcd = COPY killed $esi
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%1:gr32_abcd = COPY killed $edi
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%5:gr8 = COPY %1.sub_8bit_hi
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%6:gr8 = COPY %1.sub_8bit_hi
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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 !15
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%3:gr32 = MOV32r0 implicit-def dead $eflags
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$edi = COPY killed %3, debug-location !15
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CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !15
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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 !15
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%4:gr32 = COPY killed $eax, debug-location !15
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%10:gr32 = MOV32ri 0
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%11:gr32 = MOV32ri 1
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%12:gr32 = MOV32ri 2
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%13:gr32 = MOV32ri 3
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%14:gr32 = MOV32ri 4
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%15:gr32 = MOV32ri 5
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%16:gr32 = MOV32ri 6
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%17:gr32 = MOV32ri 7
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%18:gr32 = MOV32ri 8
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%19:gr32 = MOV32ri 9
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%20:gr32 = MOV32ri 10
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%21:gr32 = MOV32ri 11
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%22:gr32 = MOV32ri 12
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%23:gr32 = MOV32ri 13
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%24:gr32 = MOV32ri 14
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TEST32rr killed %4, %4, implicit-def $eflags, debug-location !15
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JCC_1 %bb.2, 5, implicit killed $eflags, debug-location !17
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JMP_1 %bb.1, debug-location !17
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bb.1:
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%30:gr32 = MOV32ri 0
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%31:gr32 = MOV32ri 1
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%32:gr32 = MOV32ri 2
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%33:gr32 = MOV32ri 3
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%34:gr32 = MOV32ri 4
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%35:gr32 = MOV32ri 5
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%36:gr32 = MOV32ri 6
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%37:gr32 = MOV32ri 7
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%38:gr32 = MOV32ri 8
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%39:gr32 = MOV32ri 9
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%40:gr32 = MOV32ri 10
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%41:gr32 = MOV32ri 11
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%42:gr32 = MOV32ri 12
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%43:gr32 = MOV32ri 13
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%44:gr32 = MOV32ri 14
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; CHECK-LABEL: bb.2:
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bb.2:
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%0:gr8 = PHI %5, %bb.0, %6, %bb.1, debug-instr-number 1, debug-location !18
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%50:gr32 = PHI %10, %bb.0, %30, %bb.1, debug-location !18
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%51:gr32 = PHI %11, %bb.0, %31, %bb.1, debug-location !18
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%52:gr32 = PHI %12, %bb.0, %32, %bb.1, debug-location !18
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%53:gr32 = PHI %13, %bb.0, %33, %bb.1, debug-location !18
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%54:gr32 = PHI %14, %bb.0, %34, %bb.1, debug-location !18
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%55:gr32 = PHI %15, %bb.0, %35, %bb.1, debug-location !18
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%56:gr32 = PHI %16, %bb.0, %36, %bb.1, debug-location !18
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%57:gr32 = PHI %17, %bb.0, %37, %bb.1, debug-location !18
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%58:gr32 = PHI %18, %bb.0, %38, %bb.1, debug-location !18
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%59:gr32 = PHI %19, %bb.0, %39, %bb.1, debug-location !18
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%60:gr32 = PHI %20, %bb.0, %40, %bb.1, debug-location !18
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%61:gr32 = PHI %21, %bb.0, %41, %bb.1, debug-location !18
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%62:gr32 = PHI %22, %bb.0, %42, %bb.1, debug-location !18
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%63:gr32 = PHI %23, %bb.0, %43, %bb.1, debug-location !18
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%64:gr32 = PHI %24, %bb.0, %44, %bb.1, debug-location !18
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INLINEASM &"", 1, 12, %50, 12, %51, 12, %52, 12, %53, 12, %54, 12, %55, 12, %56, 12, %57, 12, %58, 12, %59, 12, %60, 12, %61, 12, %62, 12, %63, 12, %64
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DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !12
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; CHECK-NOT: DBG_PHI
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; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)
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; CHECK-NOT: DBG_PHI
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$eax = COPY killed %0, debug-location !19
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RET 0, killed $eax, debug-location !19
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...
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