[llvm-dev] Instrument intrinsic invalid (original) (raw)

Chen, Yuanfang via llvm-dev llvm-dev at lists.llvm.org
Mon Jul 20 10:07:10 PDT 2020

Could you please elaborate on what are you trying to do? llvm.dbg.label is for debuginfo generation of the program being compiled, not for attaching user info and passing around.

From: Jinyan <phantom0308 at zju.edu.cn> Sent: Sunday, July 19, 2020 2:16 AM To: Chen, Yuanfang Subject: Re: Re: [llvm-dev] Instrument intrinsic invalid

Wow ! It seems insertLabel internal is also use builder to create, the key point in my bug is to convert the MDNode* to a DILabel*, after passing a DILAble as arg, it works, thks! I want to use llvm.dbg.label to instrument some machine instructions at the backend, but now the metadata must obey the format of DILabel, I can only pass my info in name field... Are there any existing intrinsic that can be used to pass arbitrary metadata ? Please you get me some suggestion ?

-----Original Messages----- From: "Chen, Yuanfang" <Yuanfang.Chen at sony.com> Sent Time: 2020-07-19 15:19:39 (Sunday) To: "llvm-dev at lists.llvm.org" <llvm-dev at lists.llvm.org>, Jinyan <phantom0308 at zju.edu.cn> Cc: Subject: Re: [llvm-dev] Instrument intrinsic invalid

Hi, A successfully printed module could still be invalid such as this case. The problem is that the metadata should contain a DILabel instead of a string. Try using DIBuilder::insertLabel instead.

From: llvm-dev <llvm-dev-bounces at lists.llvm.org> on behalf of Jinyan via llvm-dev <llvm-dev at lists.llvm.org> Sent: Saturday, July 18, 2020 11:48 PM To: llvm-dev at lists.llvm.org Subject: [llvm-dev] Instrument intrinsic invalid Hi, I try to use llvm-dis to disassemble the result after opt, my pass will add a intrinsic after the load instruction, like following: bool fpscan::ldAddMetadata (Instruction *Inst, StringRef c) { std::vector<Metadata *> dataTuples; // Add metadata in list dataTuples.pushback(MDString::get(Inst->getContext(), c)); MDNode* N = MDNode::get(Inst->getContext(), dataTuples); Value* meta = MetadataAsValue::get(Inst->getContext(), N); std::vector<Value*> args; args.pushback(meta); IRBuilder<> Builder(Inst->getNextNode()); Builder.CreateCall(dbglabelPtr, args, ""); } And before my pass finish, I print the IR, it shows I successfully add the intrinsic %5 = load i32 (i32, i32), i32 (i32, i32)* %1, align 8, !dbg !35, !ppp.load !36 call void @llvm.dbg.label(metadata !36), !dbg !37 ... ; Function Attrs: nounwind readnone speculatable willreturn declare void @llvm.dbg.label(metadata) #1 But, when I use llvm-dis to disassemble the .bc generated by opt, it ignore the code I insert: invalid llvm.dbg.label intrinsic variable call void @llvm.dbg.label(metadata !36), !dbg !37 !36 = !{!"dbg1", !"dbgfromLoad"} llvm-dis: warning: ignoring invalid debug info in test.bc How to fix this warning ? thks

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