The initial version of SymbolLocatorSymStore supported servers only on
local paths. This patch extends it to HTTP/HTTPS end-points. For that to
work on Windows, we add a WinHTTP-based HTTP client backend in LLVM next
to the existing CURL-based implementation.
We don't add a HTTP server implementation, because there is no use right
now. Test coverage for the LLVM part is built on llvm-debuginfod-find
and works server-less, since it checks textual output of request
headers. The existing CURL-based implementation uses the same approach.
The LLDB API test for the specific SymbolLocatorSymStore feature spawns
a HTTP server from Python.
To keep the size of this patch within reasonable limits, the initial
implementation of the SymbolLocatorSymStore feature is dump: There is no
caching, no verification of downloaded files and no protection against
file corruptions. We use a local implementation of LLVM's
HTTPResponseHandler, but should think about extracting and reusing
Debuginfod's StreamedHTTPResponseHandler in the future.
The goal of this patch is a basic working implementation that is
testable in isolation. We will iterate on it to improve it further. This
should be fine since downloading from SymStores is not default-enabled
yet. Users have to set their server URLs explicitly.
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Co-authored-by: Alexandre Ganea <aganea@havenstudios.com>
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