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I noticed that gdb's DAP code did not provide a way to see register
values. DAP defines a "register" scope, which this patch implements.
This patch also adds the missing (and optional) "presentationHint" to
scopes.
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The DAP scopes request examines the symbols in a block tree, but
neglects to omit types. This patch fixes the problem.
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The DAP code already claimed to implement "scopes" and "evaluate", but
this wasn't done completely correctly. This patch implements these
and also implements the "variables" request.
After this patch, variables and scopes correctly report their
sub-structure. This also interfaces with the gdb pretty-printer API,
so the output of pretty-printers is available.
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The copyright years in the ROCm files (e.g. solib-rocm.c) are wrong,
they end in 2022 instead of 2023. I suppose because I posted (or at
least prepared) the patches in 2022 but merged them in 2023, and forgot
to update the year. I found a bunch of other files that are in the same
situation. Fix them all up.
Change-Id: Ia55f5b563606c2ba6a89046f22bc0bf1c0ff2e10
Reviewed-By: Tom Tromey <tom@tromey.com>
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The Debugger Adapter Protocol is a JSON-RPC protocol that IDEs can use
to communicate with debuggers. You can find more information here:
https://microsoft.github.io/debug-adapter-protocol/
Frequently this is implemented as a shim, but it seemed to me that GDB
could implement it directly, via the Python API. This patch is the
initial implementation.
DAP is implemented as a new "interp". This is slightly weird, because
it doesn't act like an ordinary interpreter -- for example it doesn't
implement a command syntax, and doesn't use GDB's ordinary event loop.
However, this seemed like the best approach overall.
To run GDB in this mode, use:
gdb -i=dap
The DAP code will accept JSON-RPC messages on stdin and print
responses to stdout. GDB redirects the inferior's stdout to a new
pipe so that output can be encapsulated by the protocol.
The Python code uses multiple threads to do its work. Separate
threads are used for reading JSON from the client and for writing JSON
to the client. All GDB work is done in the main thread. (The first
implementation used asyncio, but this had some limitations, and so I
rewrote it to use threads instead.)
This is not a complete implementation of the protocol, but it does
implement enough to demonstrate that the overall approach works.
There is a rudimentary test suite. It uses a JSON parser written in
pure Tcl. This parser is under the same license as Tcl itself, so I
felt it was acceptable to simply import it into the tree.
There is also a bit of documentation -- just documenting the new
interpreter name.
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