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Add option to limit Debugify to locations (omitting variables) 

Summary:
It can be helpful to test behaviour w.r.t locations without having DEBUG_VALUE
around. In particular, because DEBUG_VALUE has the potential to change CodeGen
behaviour (e.g. hasOneUse() vs hasOneNonDbgUse()) while locations generally
don't.

Reviewers: aprantl, bogner

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77438
This commit is contained in:
Daniel Sanders 2020-04-03 15:50:11 -07:00
parent 41610d6650
commit 15f7bc7857
2 changed files with 35 additions and 0 deletions
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14
llvm/lib/Transforms/Utils/Debugify.cpp
View File

@ -30,6 +30,17 @@ namespace {
cl::opt<bool> Quiet("debugify-quiet",
cl::desc("Suppress verbose debugify output"));
enum class Level {
Locations,
LocationsAndVariables
};
cl::opt<Level> DebugifyLevel(
"debugify-level", cl::desc("Kind of debug info to add"),
cl::values(clEnumValN(Level::Locations, "locations", "Locations only"),
clEnumValN(Level::LocationsAndVariables, "location+variables",
"Locations and Variables")),
cl::init(Level::LocationsAndVariables));
raw_ostream &dbg() { return Quiet ? nulls() : errs(); }
uint64_t getAllocSizeInBits(Module &M, Type *Ty) {
@ -100,6 +111,9 @@ bool applyDebugifyMetadata(Module &M,
for (Instruction &I : BB)
I.setDebugLoc(DILocation::get(Ctx, NextLine++, 1, SP));
if (DebugifyLevel < Level::LocationsAndVariables)
continue;
// Inserting debug values into EH pads can break IR invariants.
if (BB.isEHPad())
continue;

21
llvm/test/Transforms/Util/Debugify/loc-only.ll Normal file
View File

@ -0,0 +1,21 @@
; RUN: opt -debugify -S < %s | FileCheck --check-prefixes=ALL,VALUE %s
; RUN: opt -debugify -debugify-level=locations -S < %s | FileCheck --check-prefixes=ALL --implicit-check-not=dbg.value %s
; ALL-LABEL: @test
define void @test() {
%add = add i32 1, 2
; ALL-NEXT: %add = add i32 1, 2, !dbg [[L1:![0-9]+]]
; VALUE-NEXT: call void @llvm.dbg.value(metadata i32 %add, metadata [[add:![0-9]+]], metadata !DIExpression()), !dbg [[L1]]
%sub = sub i32 %add, 1
; ALL-NEXT: %sub = sub i32 %add, 1, !dbg [[L2:![0-9]+]]
; VALUE-NEXT: call void @llvm.dbg.value(metadata i32 %sub, metadata [[sub:![0-9]+]], metadata !DIExpression()), !dbg [[L2]]
; ALL-NEXT: ret void, !dbg [[L3:![0-9]+]]
ret void
}
; VALUE: [[add]] = !DILocalVariable
; VALUE: [[sub]] = !DILocalVariable
; ALL: [[L1]] = !DILocation(line: 1, column: 1, scope:
; ALL: [[L2]] = !DILocation(line: 2, column: 1, scope:
; ALL: [[L3]] = !DILocation(line: 3, column: 1, scope: