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15 instrumentation points and a runtime library that can dynamically enable and
18 More high level information about XRay can be found in the `XRay whitepaper`_.
45 You can use XRay in a couple of ways:
66 instrumentation points. You can tweak that number through the
73 You can also specifically instrument functions in your binary to either always
74 or never be instrumented using source-level attributes. You can do it using the
87 When linking a binary, you can either manually link in the `XRay Runtime
89 ``-fxray-instrument`` flag. Alternatively, you can statically link-in the XRay
97 If you're using LLVM IR directly, you can add the ``function-instrument``
111 You can also set the ``xray-instruction-threshold`` attribute and provide a
124 Attributes can be imbued through the use of special case files instead of
125 adding them to the original source files. You can use this to mark certain
139 These files can be provided through the ``-fxray-attr-list=`` flag to clang.
158 These options can be controlled through the ``XRAY_OPTIONS`` environment
191   ``__xray_log_register_mode(...)`` can be chosen with this function.
197 Once a logging implementation has been initialized, it can be "stopped" by
200 an implementation's data can be cleared out through the
213 execution, and periodically append to a single log. This mode can be
215 environment variable. Combined with ``patch_premain=true`` this can allow for
219 implementation can be configured through the ``__xray_log_init_mode(...)``
221 defaults can be provided in the ``XRAY_BASIC_OPTIONS`` environment variable.
233 implementation can be provided in the ``XRAY_FDR_OPTIONS`` environment
234 variable. Programmatic configuration can be done by calling
242 the logging implementation is finalized -- at which point it can be flushed and
280 We currently have the beginnings of a trace analysis tool in LLVM, which can be
289 - ``convert``: Converts an XRay log file from one format to another. We can
325 - With a large instrumented binary, the size of generated XRay traces can