[Bugfix][Relax] Remove call to tvm.build for empty TIR module #16561
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Prior to this commit, if a lowered `IRModule` does not contain any TIR functions, `tvm.relax.build` provided an empty `tir_mod`, which caused a segfault during TIR compilation. This could occur when `tvm.relax.build` is called without an explicit target argument, for a module that does not define any virtual devices. This commit updates the `_filter_tir` utility function to return `None` if there are no TIR functions, rather than an empty `IRModule`. In addition, checks for an empty `IRModule` are added to `tvm.build` and `TIRToRuntime`, so that a similar failure mode would raise an exception rather than producing a segfault.
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Prior to this commit, if a lowered
IRModuledoes not contain any TIR functions,tvm.relax.buildprovided an emptytir_mod, which caused a segfault during TIR compilation. This could occur whentvm.relax.buildis called without an explicit target argument, for a module that does not define any virtual devices.This commit updates the
_filter_tirutility function to returnNoneif there are no TIR functions, rather than an emptyIRModule. In addition, checks for an emptyIRModuleare added totvm.buildandTIRToRuntime, so that a similar failure mode would raise an exception rather than producing a segfault.