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https://github.com/RPCS3/llvm-mirror.git
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c57016fd83
This patch adds support to the instruction-referencing LiveDebugValues implementation for emitting entry values. The instruction referencing implementations tracking by value rather than location means that we can get around two of the issues with VarLocs. DBG_VALUE instructions that re-assign the same value to a variable are no longer a problem, because we can "see through" to the value being assigned. We also don't need to do anything special during the dataflow stages: the "variable value problem" doesn't need to know whether a value is available most of the time, and the times it deoes need to know are always when entry values need to be terminated. The patch modifies the "TransferTracker" class, adding methods to identify when a variable ias an entry value candidate, and when a machine value is an entry value. recoverAsEntryValue tests these two things and emits an entry-value expression if they're true. It's used when we clobber or otherwise lose a value and can't find a replacement location for the value it contained. Differential Revision: https://reviews.llvm.org/D88406
93 lines
4.4 KiB
LLVM
93 lines
4.4 KiB
LLVM
; RUN: llc -O0 -dwarf-version=5 -debugger-tune=lldb -march=x86-64 -filetype=obj < %s \
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; RUN: | llvm-dwarfdump - | FileCheck --implicit-check-not=DW_OP_entry_value %s
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; RUN: llc -O0 -dwarf-version=5 -debugger-tune=gdb -march=x86-64 -filetype=obj < %s \
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; RUN: | llvm-dwarfdump - | FileCheck --implicit-check-not=DW_OP_entry_value %s
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; RUN: llc -force-instr-ref-livedebugvalues=1 -O0 -dwarf-version=5 -debugger-tune=lldb -march=x86-64 -filetype=obj < %s \
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; RUN: | llvm-dwarfdump - | FileCheck --implicit-check-not=DW_OP_entry_value %s
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; RUN: llc -force-instr-ref-livedebugvalues=1 -O0 -dwarf-version=5 -debugger-tune=gdb -march=x86-64 -filetype=obj < %s \
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; RUN: | llvm-dwarfdump - | FileCheck --implicit-check-not=DW_OP_entry_value %s
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; The call-site-params are created iff corresponding DISubprogram contains
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; the AllCallsDescribed DIFlag.
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; CHECK-NOT: DW_TAG_call_site_param
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; Genarated with:
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; clang -gdwarf-5 -O0 test.c -S -emit-llvm
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;
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; ModuleID = '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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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @fn1(i32 %x, i32 %y) !dbg !7 {
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entry:
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%x.addr = alloca i32, align 4
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%y.addr = alloca i32, align 4
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%u = alloca i32, align 4
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%a = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !11, metadata !DIExpression()), !dbg !12
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store i32 %y, i32* %y.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %y.addr, metadata !13, metadata !DIExpression()), !dbg !14
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call void @llvm.dbg.declare(metadata i32* %u, metadata !15, metadata !DIExpression()), !dbg !16
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%0 = load i32, i32* %x.addr, align 4, !dbg !16
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%1 = load i32, i32* %y.addr, align 4, !dbg !16
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%add = add nsw i32 %0, %1, !dbg !16
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store i32 %add, i32* %u, align 4, !dbg !16
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%2 = load i32, i32* %x.addr, align 4, !dbg !17
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%cmp = icmp sgt i32 %2, 1, !dbg !17
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br i1 %cmp, label %if.then, label %if.else, !dbg !16
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if.then: ; preds = %entry
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%3 = load i32, i32* %u, align 4, !dbg !17
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%add1 = add nsw i32 %3, 1, !dbg !17
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store i32 %add1, i32* %u, align 4, !dbg !17
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br label %if.end, !dbg !17
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if.else: ; preds = %entry
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%4 = load i32, i32* %u, align 4, !dbg !17
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%add2 = add nsw i32 %4, 2, !dbg !17
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store i32 %add2, i32* %u, align 4, !dbg !17
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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call void @llvm.dbg.declare(metadata i32* %a, metadata !19, metadata !DIExpression()), !dbg !16
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store i32 7, i32* %a, align 4, !dbg !16
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%5 = load i32, i32* %a, align 4, !dbg !16
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call void @fn2(i32 %5), !dbg !16
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%6 = load i32, i32* %u, align 4, !dbg !16
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%dec = add nsw i32 %6, -1, !dbg !16
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store i32 %dec, i32* %u, align 4, !dbg !16
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ret void, !dbg !16
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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declare dso_local void @fn2(i32)
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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 version 11.0.0", 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 5}
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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 = !{!"clang version 11.0.0"}
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!7 = distinct !DISubprogram(name: "fn1", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null, !10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "x", arg: 1, scope: !7, file: !1, line: 5, type: !10)
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!12 = !DILocation(line: 5, column: 10, scope: !7)
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!13 = !DILocalVariable(name: "y", arg: 2, scope: !7, file: !1, line: 5, type: !10)
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!14 = !DILocation(line: 5, column: 17, scope: !7)
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!15 = !DILocalVariable(name: "u", scope: !7, file: !1, line: 6, type: !10)
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!16 = !DILocation(line: 6, column: 7, scope: !7)
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!17 = !DILocation(line: 7, column: 7, scope: !18)
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!18 = distinct !DILexicalBlock(scope: !7, file: !1, line: 7, column: 7)
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!19 = !DILocalVariable(name: "a", scope: !7, file: !1, line: 11, type: !10)
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