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[Local] Add dbg location on unreachable inst in changeToUnreachable 

As show in https://bugs.llvm.org/show_bug.cgi?id=37960
it would be desirable to have debug location in the unreachable
instruction.

Also adds a unti test for this function.

Differential Revision: https://reviews.llvm.org/D50340

llvm-svn: 339173
This commit is contained in:
Anastasis Grammenos 2018-08-07 20:21:56 +00:00
parent 7fb68d2679
commit 52d5283483
2 changed files with 51 additions and 2 deletions
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3
llvm/lib/Transforms/Utils/Local.cpp
View File

@ -1930,7 +1930,8 @@ unsigned llvm::changeToUnreachable(Instruction *I, bool UseLLVMTrap,
CallInst *CallTrap = CallInst::Create(TrapFn, "", I);
CallTrap->setDebugLoc(I->getDebugLoc());
}
new UnreachableInst(I->getContext(), I);
auto *UI = new UnreachableInst(I->getContext(), I);
UI->setDebugLoc(I->getDebugLoc());
// All instructions after this are dead.
unsigned NumInstrsRemoved = 0;

48
llvm/unittests/Transforms/Utils/Local.cpp
View File

@ -581,6 +581,54 @@ TEST_F(SalvageDebugInfoTest, RecursiveBlockSimplification) {
verifyDebugValuesAreSalvaged();
}
TEST(Local, ChangeToUnreachable) {
LLVMContext Ctx;
std::unique_ptr<Module> M = parseIR(Ctx,
R"(
define internal void @foo() !dbg !6 {
entry:
ret void, !dbg !8
}
!llvm.dbg.cu = !{!0}
!llvm.debugify = !{!3, !4}
!llvm.module.flags = !{!5}
!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "test.ll", directory: "/")
!2 = !{}
!3 = !{i32 1}
!4 = !{i32 0}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: null, file: !1, line: 1, type: !7, isLocal: true, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !2)
!7 = !DISubroutineType(types: !2)
!8 = !DILocation(line: 1, column: 1, scope: !6)
)");
bool BrokenDebugInfo = true;
verifyModule(*M, &errs(), &BrokenDebugInfo);
ASSERT_FALSE(BrokenDebugInfo);
Function &F = *cast<Function>(M->getNamedValue("foo"));
BasicBlock &BB = F.front();
Instruction &A = BB.front();
DebugLoc DLA = A.getDebugLoc();
ASSERT_TRUE(isa<ReturnInst>(&A));
// One instruction should be affected.
EXPECT_EQ(changeToUnreachable(&A, /*UseLLVMTrap*/false), 1U);
Instruction &B = BB.front();
// There should be an uncreachable instruction.
ASSERT_TRUE(isa<UnreachableInst>(&B));
DebugLoc DLB = B.getDebugLoc();
EXPECT_EQ(DLA, DLB);
}
TEST(Local, ReplaceAllDbgUsesWith) {
using namespace llvm::dwarf;