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+JS Trace Test Suite
+
+* PURPOSE
+
+This is a test suite for testing TraceMonkey. All tests are run in the JS shell
+with tracing enabled (-j).
+
+* REQUIREMENTS
+
+Python 2.5. This is already a standard requirement for building our tree.
+
+* RUNNING THE TESTS
+
+Basic usage:
+
+    python jit_test.py <path-to-js-shell>
+
+The progress bar shows [#tests passed, #tests failed, #tests run] at the left.
+If all tests pass, the output is 'PASSED ALL'. The test suite can be interrupted
+at any time with Ctrl+C and partial results will be printed.
+
+To run only the basic tests, not including the slow tests:
+
+    python jit_test.py <path-to-js-shell> basic
+
+For more options:
+
+    python jit_test.py -h
+
+* CREATING NEW TESTS
+
+Simply create a JS file under the 'tests/' directory. Most tests should go in
+'tests/basic/'.
+
+All tests are run with 'lib/prologue.js' included first on the command line. The
+command line also creates a global variable 'libdir' that is set to the path
+of the 'lib' directory. To include a file 'foo.js' from the lib directory in a 
+test case:
+
+    load(libdir + 'foo.js')
+
+* TEST METALINES
+
+The first line of a test case can contain a special comment controlling how the
+test is run. For example:
+
+    // |jit-test| allow-oom; --no-threads
+
+The general format in EBNF is:
+
+    metaline  ::= cookie { item ";" }
+    cookie    ::= "|jit-test|"
+    item      ::= flag | attribute
+
+    flag      ::= "slow" | "allow-oom" | "valgrind" | "tz-pacific" | "debug" |
+                  "--" switch
+
+    attribute ::= name ":" value
+    name      ::= "error" | "exitstatus"
+    value     ::= <string>
+    switch    ::= <string>
+
+The metaline may appear anywhere in the first line of the file: this allows it
+to be placed inside any kind of comment.
+
+The meaning of the items:
+
+    slow         Test runs slowly. Do not run if the --no-slow option is given.
+    allow-oom    If the test runs out of memory, it counts as passing.
+    valgrind     Run test under valgrind.
+    tz-pacific   Always run test with the Pacific time zone (TZ=PST8PDT).
+
+    error        The test should be considered to pass iff it throws the
+                 given JS exception.
+    exitstatus   The test should exit with the given status value (an integer).
+
+    debug        Run js with -d, whether --jitflags says to or not
+    --SWITCH     Pass --SWITCH through to js
+
+* END