From 42e7e2bf1fd3e88622fdc5e262853f91c6b626b3 Mon Sep 17 00:00:00 2001
From: Kevin Pouget <kevin.pouget@imag.fr>
Date: Fri, 19 Feb 2016 14:50:52 +0100
Subject: [PATCH] add readme and licence
---
LICENSE | 202 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
README.md | 142 ++++++++++++++++++++++++++++++++++++++
2 files changed, 344 insertions(+)
create mode 100644 LICENSE
create mode 100644 README.md
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f4d8974
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..21b6d4c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,142 @@
+`gdb.tester.py` is a Python framework for writing unit tests and benchmarks
+for gdb. It is basically a wrapper around gdb CLI interface to
+automate execution and drive it from Python.
+
+Don't get me wrong, this is nothing related to [GDB Python
+interface](https://sourceware.org/gdb/current/onlinedocs/gdb/Python-API.html#Python-API).
+This API is for extending GDB, whereas GDB Tester is for scripting it.
+
+Where and how to specify unit-tests and benchmarks
+------------------------------------------------
+
+`gdb.tester.py` test files should be stored in a subpackage called
+`[*_]testing`, inside the Python package tree. `gdb.tester.py` walks
+through that tree, and runs alls the modules of that package.
+
+Inside the modules, `gdb.tester.py` expects to find functions called
+`benchmark` or `test`.
+
+
+How to write unit-tests and benchmarks
+--------------------------------------
+
+Here is a template of a unit-testing and benchmarking module:
+
+ def benchmark(gdb):
+
+ def init_hook():
+ # this code is run at start and reset
+ pass
+
+ # benchmark.c is in the same directory,
+ # benchmark is build by `make`
+
+ gdb.start(CSource("benchmark.c"), init_hook)
+ gdb.set_title("my empty benchmark")
+ gdb.execute("break finish_data_ready")
+ gdb.execute("run")
+
+ # inside benchmark.c we measure the execution time
+ # and save it into `us_busy_once`.
+ gdb.save_value("us_busy_once", "%1.f", "us")
+
+ # if we had other measures to do
+ gdb.reset(hard=False) # hard means quit and restart
+
+ gdb.quit()
+
+ def test(gdb):
+ # second parameter is text expected in ouput
+ gdb.execute("where", "No stack.")
+
+ gdb.start(CSource("parallel-demo.c"))
+
+ gdb.execute_many(["start", "next", "next"])
+
+ gdb.execute("where", "in main")
+ gdb.execute("cont", "exited normally", may_fail=True)
+
+
+Example
+-------
+
+You'll find examples in the `_testing` subpackages. However, they are
+specific to my `mcgdb` project, so they won't work out of the
+box. Only `mcgdb_testing.native_gdb` benchmark was written for a
+vanilla GDB:
+
+ from gdb_tester import *
+
+ gdb = None
+
+ def run(what, run="run"):
+ gdb.set_title(what)
+ gdb.execute("break finish_data_ready")
+ gdb.execute(run)
+ gdb.execute("up")
+
+ gdb.save_value("us_busy_once", "%1.f", "us")
+
+ def nominal_time():
+ run("Nominal time")
+
+ def gdb_watchpoint():
+ gdb.execute("break benchmark")
+ gdb.execute("run")
+ gdb.execute("print &i")
+ gdb.execute("watch *$1")
+ gdb.execute("""command
+ silent
+ continue
+ end""")
+ gdb.execute("py [b for b in gdb.breakpoints() if b.location == 'benchmark'][0].delete()")
+
+ run("HW Watchpoint command", run="continue")
+
+ def gdb_breakpoint():
+ gdb.execute("break action")
+ gdb.execute("""command
+ silent
+ continue
+ end""")
+ run("Breakpoint command")
+
+ PARAMETERS = [
+ 'int(gdb.parse_and_eval("it"))',
+ 'int(gdb.newest_frame().older().read_var("i"))'
+ ]
+ def gdb_py_breakpoint_parameter(params_choice):
+ params = [par for i, par in enumerate(PARAMETERS) if params_choice & (1 << i)]
+
+ def to_run():
+ gdb.execute("""python
+ class TestBP(gdb.Breakpoint):
+ def __init__(self):
+ gdb.Breakpoint.__init__(self, "action")
+ self.silent=True
+
+ def stop(self):
+ {params}
+ return False
+
+ TestBP()
+ end
+ """.format(params="\n ".join(params)))
+ run("Py BP param {:02b}".format(params_choice)[2:])
+
+ return to_run
+
+ def benchmark(_gdb, what=None, no_mcgdb=True):
+ global gdb
+ gdb = _gdb
+
+ if what is None:
+ what = [nominal_time, gdb_breakpoint, gdb_watchpoint] + \
+ list(map(lambda x: gdb_py_breakpoint_parameter(x), (0b0, 0b1, 0b10, 0b11)))
+
+ gdb.start(CSource("benchmark.c"), None if no_mcgdb else mcgdb.testing.gdb__init_mcgdb)
+ for prepare_and_run in what:
+ prepare_and_run()
+ gdb.reset(hard=(not no_mcgdb))
+
+ gdb.quit()
\ No newline at end of file
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