[Apache TVM Discuss] [Questions] Finding types of TVM objects and accessing their attributes in GDB

[Anirudh via Apache TVM Discuss <no...@discuss.tvm.ai>]

Hi all,

Just a generic question about debugging in GDB. Is there a good way to find the proper type of an `"object"` in GDB?

What I mean by that is, say there is an `AddNode` passed to a function as a `PrimExpr` and while debugging this function, is there way to find that it actually belongs to an `AddNode`. Trying `whatis object` or `ptype object` just prints that it's a `PrimExpr`.

I found a rather hacky way to do this by printing 

the `object.deleter_` if it's a subclass of `tvm::runtime::Object`, and 

`object.get().deleter_` if it's a subclass of `tvm::runtime::ObjectRef`

This prints the type of the `Deleter_` for that object and the template argument to the Handler contains the proper type (a sample output for `AddNode` is as shown below:)

> $65 = (tvm::runtime::Object::FDeleter) 0x7fffaf6c9300 <tvm::runtime::SimpleObjAllocator::Handler\<**tvm::tir::AddNode**\>::Deleter_(tvm::runtime::Object*)>

I was just wondering whether there's a stable/reliable way to get this info.





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[Apache TVM Discuss] [Questions] Finding types of TVM objects and accessing their attributes in GDB

[Anirudh via Apache TVM Discuss <no...@discuss.tvm.ai>]

Right, I think `tvm::Dump(xxx)` also supports printing entire PrimFunc. The main question I had was, is there a clean way to find the underlying type of an `Object`/`ObjectRef`. Basically, if I have a `PrimFunc` is there a way to find that the underlying type is say an `AddNode`.





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[Apache TVM Discuss] [Questions] Finding types of TVM objects and accessing their attributes in GDB

[Johnson9009 via Apache TVM Discuss <no...@discuss.tvm.ai>]

I haven't used `tvm::Dump(xxx)`, I use `call (size_t)puts(PrettyPrint(xxx).c_str())` when the `xxx` is a large node, e.g., the whole of PrimFunc, you can try with these large node.





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[Apache TVM Discuss] [Questions] Finding types of TVM objects and accessing their attributes in GDB

[Anirudh via Apache TVM Discuss <no...@discuss.tvm.ai>]

Thanks for the reply, atleast I'm not the only one who is using the deleter_ hack to find the types of nodes.

And thanks for the ideas with PrettyPrint, I haven't used it too much in gdb, I normally use the `p tvm::Dump(xxx)` for printing Objects and ObjectRefs. 

So, out of curiosity, is there a difference between what's printed by `tvm::Dump` vs what's printed by `call (size_t)puts(PrettyPrint(xxx).c_str())`. I tried it on a couple of simple examples and did not see any major differences.





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[Apache TVM Discuss] [Questions] Finding types of TVM objects and accessing their attributes in GDB

[Johnson9009 via Apache TVM Discuss <no...@discuss.tvm.ai>]

I use the same way, and when I need inspect more details of the class object, I will use `p PrettyPrint(xxx).c_str()`, in addition if I want a more clear display(do the real line break instead of just print it as "\n"), the gdb command `call (size_t)puts(PrettyPrint(xxx).c_str())` will be used.

for the last command, it is better to set the standard output of the process to another terminal.





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