This patch fixes an error that caused some Dexter test failures, driven
by two separate causes. The first issue is that frames below main were
appearing in the program stacktrace; while Dexter tries to filter frames
below main during the stacktrace collection step based on a pre-written
list, this list may not be comprehensive enough, as the symbol
"___lldb_unnamed_symbol_2a150" has also appeared. In order to guard
against this and future cases that might appear, this patch adds a check
to Dexter for "presentationHint: deemphasize" in the DAP response; this
is added by LLDB (and other dap-based debuggers) as a hint that the
frame is not user source, and should be a generally useful way of
avoiding evaluating frames that are not wanted.
The second issue is a mismatch between the breakpoint-setting logic and
the state-matching logic: the former allows root !where nodes to omit
the "file" field, using the script file as a default file. The state
matching logic does not perform any checking for an omitted file.
Together, this means that we may correctly set breakpoints for e.g.
"test.cpp:10", but when we go to match against frames, the !where node
may match against some other line-10 that appears below (e.g. as a
caller of) the frame at test.cpp:10. This patch copies the default_file
logic to state matching, meaning that we will only match against the
intended frame.
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