From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 18 Mar 2021 21:04:07 +0000 (-0400)
Subject: Refactoring: bytecode interpreter ABI
X-Git-Tag: v2.13.0-rc1~242
X-Git-Url: http://git.lttng.org./?a=commitdiff_plain;h=22c30e27e59035f165bfa0540022eeca113fcd59;hp=22c30e27e59035f165bfa0540022eeca113fcd59;p=lttng-ust.git

Refactoring: bytecode interpreter ABI

Refactor the ABI of the bytecode interpreter, which is used by the probe
provider callbacks:

- Return a "int" rather than uint64_t,
- The return values are now:
       LTTNG_UST_BYTECODE_INTERPRETER_ERROR = -1,
       LTTNG_UST_BYTECODE_INTERPRETER_OK = 0,
- Introduce a bytecode "context". This context is specific for each
  bytecode "class" (filter or capture). The filter class context
  has a "result" (accept/reject) output, whereas the capture class
  has an "output".
- The bytecode context is extensible with the struct_size scheme.
- Merge filter and capture interpreters into a single callback.
  That callback uses a new "bytecode type" field within the bytecode
  private data to figure out the specific bytecode class (filter or
  capture).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: Id528e141d0c213e9bb41f68d6d7e632104daa1cf
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