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[Cloning] Fix to cloning DISubprograms.

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When trying to enable -debug-info-kind=constructor there was an assert
that occurs during debug info cloning ("mismatched subprogram between
llvm.dbg.value variable and !dbg attachment").
It appears that during llvm::CloneFunctionInto, a DISubprogram could be
duplicated when MapMetadata is called, and then added to the MD map again
when DIFinder gets a list of subprograms. This results in two different
versions of the DISubprogram.

This patch switches the order so that the DIFinder subprograms are
added before MapMetadata is called.

Fixes https://bugs.llvm.org/show_bug.cgi?id=46784

Differential Revision: https://reviews.llvm.org/D86185
This commit is contained in:
Amy Huang 2020-08-21 11:54:27 -07:00
parent f6faf01d47
commit 78e1c91bb0
2 changed files with 63 additions and 12 deletions
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24
lib/Transforms/Utils/CloneFunction.cpp
View File

@ -137,16 +137,6 @@ void llvm::CloneFunctionInto(Function *NewFunc, const Function *OldFunc,
MD[SP].reset(SP);
}
SmallVector<std::pair<unsigned, MDNode *>, 1> MDs;
OldFunc->getAllMetadata(MDs);
for (auto MD : MDs) {
NewFunc->addMetadata(
MD.first,
*MapMetadata(MD.second, VMap,
ModuleLevelChanges ? RF_None : RF_NoModuleLevelChanges,
TypeMapper, Materializer));
}
// Everything else beyond this point deals with function instructions,
// so if we are dealing with a function declaration, we're done.
if (OldFunc->isDeclaration())
@ -162,7 +152,6 @@ void llvm::CloneFunctionInto(Function *NewFunc, const Function *OldFunc,
// Loop over all of the basic blocks in the function, cloning them as
// appropriate. Note that we save BE this way in order to handle cloning of
// recursive functions into themselves.
//
for (Function::const_iterator BI = OldFunc->begin(), BE = OldFunc->end();
BI != BE; ++BI) {
const BasicBlock &BB = *BI;
@ -201,6 +190,19 @@ void llvm::CloneFunctionInto(Function *NewFunc, const Function *OldFunc,
for (DIType *Type : DIFinder.types())
VMap.MD()[Type].reset(Type);
// Duplicate the metadata that is attached to the cloned function.
// Subprograms/CUs/types that were already mapped to themselves won't be
// duplicated.
SmallVector<std::pair<unsigned, MDNode *>, 1> MDs;
OldFunc->getAllMetadata(MDs);
for (auto MD : MDs) {
NewFunc->addMetadata(
MD.first,
*MapMetadata(MD.second, VMap,
ModuleLevelChanges ? RF_None : RF_NoModuleLevelChanges,
TypeMapper, Materializer));
}
// Loop over all of the instructions in the function, fixing up operand
// references as we go. This uses VMap to do all the hard work.
for (Function::iterator BB =

51
unittests/Transforms/Utils/CloningTest.cpp
View File

@ -681,7 +681,7 @@ TEST(CloneFunction, CloneEmptyFunction) {
ValueToValueMapTy VMap;
SmallVector<ReturnInst *, 8> Returns;
ClonedCodeInfo CCI;
CloneFunctionInto(DeclFunction, ImplFunction, VMap, true, Returns, "", &CCI);
CloneFunctionInto(ImplFunction, DeclFunction, VMap, true, Returns, "", &CCI);
EXPECT_FALSE(verifyModule(*ImplModule, &errs()));
EXPECT_FALSE(CCI.ContainsCalls);
@ -719,6 +719,55 @@ TEST(CloneFunction, CloneFunctionWithInalloca) {
EXPECT_TRUE(CCI.ContainsDynamicAllocas);
}
TEST(CloneFunction, CloneFunctionWithSubprograms) {
// Tests that the debug info is duplicated correctly when a DISubprogram
// happens to be one of the operands of the DISubprogram that is being cloned.
// In general, operands of "test" that are distinct should be duplicated,
// but in this case "my_operator" should not be duplicated. If it is
// duplicated, the metadata in the llvm.dbg.declare could end up with
// different duplicates.
StringRef ImplAssembly = R"(
declare void @llvm.dbg.declare(metadata, metadata, metadata)
define void @test() !dbg !5 {
call void @llvm.dbg.declare(metadata i8* undef, metadata !4, metadata !DIExpression()), !dbg !6
ret void
}
declare void @cloned()
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1)
!1 = !DIFile(filename: "test.cpp", directory: "")
!2 = !{i32 1, !"Debug Info Version", i32 3}
!3 = distinct !DISubprogram(name: "my_operator", scope: !1, unit: !0, retainedNodes: !{!4})
!4 = !DILocalVariable(name: "awaitables", scope: !3)
!5 = distinct !DISubprogram(name: "test", scope: !3, unit: !0)
!6 = !DILocation(line: 55, column: 15, scope: !3, inlinedAt: !7)
!7 = distinct !DILocation(line: 73, column: 14, scope: !5)
)";
LLVMContext Context;
SMDiagnostic Error;
auto ImplModule = parseAssemblyString(ImplAssembly, Error, Context);
EXPECT_TRUE(ImplModule != nullptr);
auto *OldFunc = ImplModule->getFunction("test");
EXPECT_TRUE(OldFunc != nullptr);
auto *NewFunc = ImplModule->getFunction("cloned");
EXPECT_TRUE(NewFunc != nullptr);
ValueToValueMapTy VMap;
SmallVector<ReturnInst *, 8> Returns;
ClonedCodeInfo CCI;
CloneFunctionInto(NewFunc, OldFunc, VMap, true, Returns, "", &CCI);
// This fails if the scopes in the llvm.dbg.declare variable and location
// aren't the same.
EXPECT_FALSE(verifyModule(*ImplModule, &errs()));
}
TEST(CloneFunction, CloneFunctionToDifferentModule) {
StringRef ImplAssembly = R"(
define void @foo() {