• Austin Clements's avatar
    cmd/internal/obj, cmd/link: record ABIs and aliases in Go obj files · c5718b6b
    Austin Clements authored
    This repurposes the "version" field of a symbol reference in the Go
    object file format to be an ABI field. Currently, this is just 0 or 1
    depending on whether the symbol is static (the linker turns it into a
    different internal version number), so it's already only tenuously a
    symbol version. We change this to be -1 for static symbols and
    otherwise by the ABI number.
    
    This also adds a separate list of ABI alias symbols to be recorded in
    the object file. The ABI aliases must be a separate list and not just
    part of the symbol definitions because it's possible to have a symbol
    defined in one package and the alias "defined" in a different package.
    For example, this can happen if a symbol is defined in assembly in one
    package and stubbed in a different package. The stub triggers the
    generation of the ABI alias, but in a different package from the
    definition.
    
    For #27539.
    
    Change-Id: I015c9fe54690c027de6ef77e22b5585976a01587
    Reviewed-on: https://go-review.googlesource.com/c/147157
    Run-TryBot: Austin Clements <austin@google.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarDavid Chase <drchase@google.com>
    c5718b6b
read.go 16.4 KB