d2d9dc8eb4
Debugify is extremely useful as a testing and debugging tool, and a good number of LLVM-IR transform tests use it. We need it to support "new" non-instruction debug-info to get test coverage, but it's not important enough to completely convert right now (and it'd be a large undertaking). Thus: convert to/from dbg.value/DPValue mode on entry and exit of the pass, which gives us the functionality without any further work. The cost is compile-time, but again this is only happening during tests. Tested by: the large set of debugify tests enabled here. Note the InstCombine test (cast-mul-select.ll) that hasn't been fully enabled: this is because there's a debug-info sinking piece of code there that hasn't been instrumented.
74 lines
2.6 KiB
LLVM
74 lines
2.6 KiB
LLVM
; RUN: opt -passes='module(debugify),function(dce)' -S < %s | FileCheck %s
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; RUN: opt -passes='module(debugify),function(dce)' -S < %s --try-experimental-debuginfo-iterators | FileCheck %s
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; CHECK-LABEL: @test
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define void @test() {
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%add = add i32 1, 2
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 1, metadata [[add:![0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 2, DW_OP_stack_value))
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%sub = sub i32 %add, 1
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 1, metadata [[sub:![0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 2, DW_OP_constu, 1, DW_OP_minus, DW_OP_stack_value))
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; CHECK-NEXT: ret void
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ret void
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}
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declare void @llvm.lifetime.start.p0(i64, ptr nocapture) nounwind
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declare void @llvm.lifetime.end.p0(i64, ptr nocapture) nounwind
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; CHECK-LABEL: @test_lifetime_alloca
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define i32 @test_lifetime_alloca() {
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; Check that lifetime intrinsics are removed along with the pointer.
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; CHECK-NEXT: @llvm.dbg.value
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; CHECK-NEXT: ret i32 0
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; CHECK-NOT: llvm.lifetime.start
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; CHECK-NOT: llvm.lifetime.end
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%i = alloca i8, align 4
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call void @llvm.lifetime.start.p0(i64 -1, ptr %i)
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call void @llvm.lifetime.end.p0(i64 -1, ptr %i)
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ret i32 0
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}
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; CHECK-LABEL: @test_lifetime_arg
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define i32 @test_lifetime_arg(ptr) {
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; Check that lifetime intrinsics are removed along with the pointer.
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; CHECK-NEXT: llvm.dbg.value
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; CHECK-NEXT: ret i32 0
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; CHECK-NOT: llvm.lifetime.start
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; CHECK-NOT: llvm.lifetime.end
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call void @llvm.lifetime.start.p0(i64 -1, ptr %0)
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call void @llvm.lifetime.end.p0(i64 -1, ptr %0)
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ret i32 0
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}
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@glob = global i8 1
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; CHECK-LABEL: @test_lifetime_global
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define i32 @test_lifetime_global() {
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; Check that lifetime intrinsics are removed along with the pointer.
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; CHECK-NEXT: llvm.dbg.value
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; CHECK-NEXT: ret i32 0
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; CHECK-NOT: llvm.lifetime.start
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; CHECK-NOT: llvm.lifetime.end
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call void @llvm.lifetime.start.p0(i64 -1, ptr @glob)
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call void @llvm.lifetime.end.p0(i64 -1, ptr @glob)
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ret i32 0
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}
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; CHECK-LABEL: @test_lifetime_bitcast
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define i32 @test_lifetime_bitcast(ptr %arg) {
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; Check that lifetime intrinsics are NOT removed when the pointer is a bitcast.
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; It's not uncommon for two bitcasts to be made: one for lifetime, one for use.
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; TODO: Support the above case.
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; CHECK-NEXT: bitcast
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; CHECK-NEXT: llvm.dbg.value
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; CHECK-NEXT: llvm.lifetime.start.p0(i64 -1, ptr %cast)
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; CHECK-NEXT: llvm.lifetime.end.p0(i64 -1, ptr %cast)
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; CHECK-NEXT: ret i32 0
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%cast = bitcast ptr %arg to ptr
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call void @llvm.lifetime.start.p0(i64 -1, ptr %cast)
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call void @llvm.lifetime.end.p0(i64 -1, ptr %cast)
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ret i32 0
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}
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; CHECK: [[add]] = !DILocalVariable
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; CHECK: [[sub]] = !DILocalVariable
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