btf: export API to create BTF from scratch #859
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We want to allow creating Spec from scratch, without starting from an ELF. In such cases it's a waste to maintaing a string table. Return an error in code paths that rely on Spec.strings to not be nil. Signed-off-by: Lorenz Bauer <oss@lmb.io>
Export Spec.Add which adds a Type to a Spec. It's then possible to create
BTF on-the-fly like so:
spec := NewSpec()
id, err := spec.Add(...)
handle, err := NewHandle(&spec)
Spec.Add is responsible for allocating type IDs, which makes the BTF
encoder a lot simpler.
Attempting to create a Handle from a Spec that doesn't contain all
types will return an error. This can happen if a Type is modified
after it has been added to a Spec.
Signed-off-by: Lorenz Bauer <oss@lmb.io>
Signed-off-by: Lorenz Bauer <oss@lmb.io>
Replace the bare-bones marshalBTF with marshalTypes, but avoid calling NewHandle to prevent circular dependencies. Signed-off-by: Lorenz Bauer <oss@lmb.io>
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Want to include cilium/ebpf#859 Signed-off-by: Anastasios Papagiannis <tasos.papagiannnis@gmail.com>
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Want to include cilium/ebpf#859 go get github.com/cilium/ebpf@master Signed-off-by: Anastasios Papagiannis <tasos.papagiannnis@gmail.com>
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Add Spec.Add, which allows creating BTF on the fly from outside of the btf package.