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[Reduce] Argument reduction: do properly handle invoke insts (PR46819)

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replaceFunctionCalls() is very non-exhaustive, it only handles
CallInst's. Which means, by the time we drop old function,
there may still be uses of it lurking around.
Let's instead whack-a-mole them by all by replacing with undef.

I'm not sure this is the best handling, especially for calls, but IMO
poorly reduced input is much better than crashing reduction tool.
A (previously-crashing!) test added.

Fixes https://bugs.llvm.org/show_bug.cgi?id=46819
This commit is contained in:
Roman Lebedev 2020-07-25 23:24:13 +03:00
parent c62f97f67d
commit 942c801f82
2 changed files with 56 additions and 0 deletions
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55
test/Reduce/remove-invoked-functions.ll Normal file
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@ -0,0 +1,55 @@
; RUN: llvm-reduce --test FileCheck --test-arg --check-prefixes=CHECK-ALL,CHECK-INTERESTINGNESS --test-arg %s --test-arg --input-file %s -o %t
; RUN: cat %t | FileCheck --check-prefixes=CHECK-ALL,CHECK-FINAL %s
; CHECK-INTERESTINGNESS: define i32 @maybe_throwing_callee(
; CHECK-FINAL: define i32 @maybe_throwing_callee()
define i32 @maybe_throwing_callee(i32 %arg) {
; CHECK-ALL: call void @thrown()
; CHECK-INTERESTINGNESS: ret i32
; CHECK-FINAL: ret i32 undef
call void @thrown()
ret i32 %arg
}
; CHECK-ALL: declare void @did_not_throw(i32)
declare void @did_not_throw(i32)
; CHECK-ALL: declare void @thrown()
declare void @thrown()
; CHECK-INTERESTINGNESS: define void @caller(
; CHECK-FINAL: define void @caller(i32 %arg)
define void @caller(i32 %arg) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
; CHECK-ALL: bb:
bb:
; CHECK-INTERESTINGNESS: %i0 = invoke i32
; CHECK-FINAL: %i0 = invoke i32 undef(i32 %arg)
; CHECK-ALL: to label %bb3 unwind label %bb1
%i0 = invoke i32 @maybe_throwing_callee(i32 %arg)
to label %bb3 unwind label %bb1
; CHECK-ALL: bb1:
bb1:
; CHECK-ALL: landingpad { i8*, i32 }
; CHECK-ALL: catch i8* null
; CHECK-ALL: call void @thrown()
; CHECK-ALL: br label %bb4
landingpad { i8*, i32 }
catch i8* null
call void @thrown()
br label %bb4
; CHECK-ALL: bb3:
bb3:
; CHECK-ALL: call void @did_not_throw(i32 %i0)
; CHECK-ALL: br label %bb4
call void @did_not_throw(i32 %i0)
br label %bb4
; CHECK-ALL: bb4:
; CHECK-ALL: ret void
bb4:
ret void
}
declare i32 @__gxx_personality_v0(...)

1
tools/llvm-reduce/deltas/ReduceArguments.cpp
View File

@ -94,6 +94,7 @@ static void extractArgumentsFromModule(std::vector<Chunk> ChunksToKeep,
replaceFunctionCalls(*F, *ClonedFunc, ArgIndexesToKeep);
// Rename Cloned Function to Old's name
std::string FName = std::string(F->getName());
F->replaceAllUsesWith(UndefValue::get(F->getType()));
F->eraseFromParent();
ClonedFunc->setName(FName);
}