3ef98bcd46
CodeGenPrepare needs to support the maintenence of DPValues, the non-instruction replacement for dbg.value intrinsics. This means there are a few functions we need to duplicate or replicate the functionality of: * fixupDbgValue for setting users of sunk addr GEPs, * The remains of placeDbgValues needs a DPValue implementation for sinking * Rollback of RAUWs needs to update DPValues * Rollback of instruction removal needs supporting (see github #73350) * A few places where we have to use iterators rather than instructions. There are three places where we have to use the setHeadBit call on iterators to indicate which portion of debug-info records we're about to splice around. This is because CodeGenPrepare, unlike other optimisation passes, is very much concerned with which block an operation occurs in and where in the block instructions are because it's preparing things to be in a format that's good for SelectionDAG. There isn't a large amount of test coverage for debuginfo behaviours in this pass, hence I've added some more.
115 lines
3.7 KiB
LLVM
115 lines
3.7 KiB
LLVM
; RUN: opt -codegenprepare -S < %s | FileCheck %s
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; RUN: opt -codegenprepare -S < %s --try-experimental-debuginfo-iterators | FileCheck %s
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; The following target lines are needed for the test to exercise what it should.
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; Without these lines, CodeGenPrepare does not try to sink the bitcasts.
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc"
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declare i32 @__CxxFrameHandler3(...)
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declare void @f()
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declare void @g(ptr)
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
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; CodeGenPrepare will want to sink these bitcasts, but it selects the catchpad
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; blocks as the place to which the bitcast should be sunk. Since catchpads
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; do not allow non-phi instructions before the terminator, this isn't possible.
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; CHECK-LABEL: @test(
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define void @test(ptr %addr) personality ptr @__CxxFrameHandler3 {
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entry:
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%x = getelementptr i32, ptr %addr, i32 1
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invoke void @f()
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to label %invoke.cont unwind label %catch1
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; CHECK: invoke.cont:
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; CHECK-NEXT: %y = getelementptr i32, ptr %addr, i32 2
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invoke.cont:
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%y = getelementptr i32, ptr %addr, i32 2
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invoke void @f()
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to label %done unwind label %catch2
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done:
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ret void
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catch1:
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%cs1 = catchswitch within none [label %handler1] unwind to caller
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handler1:
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%cp1 = catchpad within %cs1 []
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br label %catch.shared
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; CHECK: handler1:
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; CHECK-NEXT: catchpad within %cs1
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catch2:
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%cs2 = catchswitch within none [label %handler2] unwind to caller
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handler2:
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%cp2 = catchpad within %cs2 []
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br label %catch.shared
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; CHECK: handler2:
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; CHECK: catchpad within %cs2
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; CHECK: catch.shared:
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; CHECK-NEXT: %p = phi ptr [ %x, %handler1 ], [ %y, %handler2 ]
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catch.shared:
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%p = phi ptr [ %x, %handler1 ], [ %y, %handler2 ]
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call void @g(ptr %p)
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unreachable
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}
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; CodeGenPrepare will want to hoist these llvm.dbg.value calls to the phi, but
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; there is no insertion point in a catchpad block.
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; CHECK-LABEL: @test_dbg_value(
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define void @test_dbg_value() personality ptr @__CxxFrameHandler3 {
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entry:
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%a = alloca i8
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%b = alloca i8
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invoke void @f() to label %next unwind label %catch.dispatch
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next:
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invoke void @f() to label %ret unwind label %catch.dispatch
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ret:
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ret void
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catch.dispatch:
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%p = phi ptr [%a, %entry], [%b, %next]
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%cs1 = catchswitch within none [label %catch] unwind to caller
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catch:
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%cp1 = catchpad within %cs1 []
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tail call void @llvm.dbg.value(metadata ptr %p, i64 0, metadata !11, metadata !13), !dbg !14
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call void @g(ptr %p)
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catchret from %cp1 to label %ret
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; CHECK: catch.dispatch:
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; CHECK-NEXT: phi ptr
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; CHECK-NEXT: catchswitch
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; CHECK-NOT: llvm.dbg.value
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; CHECK: catch:
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; CHECK-NEXT: catchpad
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; CHECK-NEXT: call void @llvm.dbg.value
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 254906) (llvm/trunk 254917)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: null)
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!1 = !DIFile(filename: "t.c", directory: "D:\5Csrc\5Cllvm\5Cbuild")
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!4 = distinct !DISubprogram(name: "test_dbg_value", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: false, unit: !0, retainedNodes: null)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"PIC Level", i32 2}
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!10 = !{!"clang version 3.8.0 (trunk 254906) (llvm/trunk 254917)"}
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!11 = !DILocalVariable(name: "p", scope: !4, file: !1, line: 2, type: !12)
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!12 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!13 = !DIExpression(DW_OP_deref)
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!14 = !DILocation(line: 2, column: 8, scope: !4)
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!15 = !DILocation(line: 3, column: 1, scope: !4)
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