A Web-based News Reader
| Subject | Re: Exception Hierarchy [WAS: Re: Top 5] | ||||||||||||||||||||||||||||||||||||
| From | Frits van Bommel <fvbommel@REMwOVExCAPSs.nl> | ||||||||||||||||||||||||||||||||||||
| Date | Sat, 18 Oct 2008 18:03:20 +0200 | ||||||||||||||||||||||||||||||||||||
| Newsgroups | digitalmars.D | ||||||||||||||||||||||||||||||||||||
| Attachment(s) | trace.zip | ||||||||||||||||||||||||||||||||||||
Brad Roberts wrote: > For anything running on top of glibc (ie, every linux distribution) it's > fairly trivial via backtrace() and backtrace_symbols() found in > execinfo.h. The symbols are the mangled form, but that's a simple matter > of code to translate back to more meaningful names. An incomplete version > of that is available in phobos already (and probably somewhere in Tango > too) -- and it should really be in the core runtime, probably. > > Given the 2 or 3 implementations floating around, I imagine it wouldn't be > hard to integrate for both windows and linux. Hey, those are a handy pair of functions. I just implemented a backtrace handler for Tango using those. The source is attached. Features: * Produces stacktraces (obviously). * Easy to use: just make sure it gets linked in (e.g. by importing trace.backtrace and using DSSS). The static constructor will then register as a stack trace provider with the runtime, and every exception will contain a stack trace. * Uses a slightly modified std.demangle (just enough to get it to compile with Tango) to demangle function names. * Filters out initial frames from its own module since they're not particularly interesting. * Lazily converts a stack trace to strings. Traces that are never printed only allocate the trace object and a list of return addresses. Stack traces that are printed multiple times only allocate the strings once. * Shouldn't be hard to port to Phobos. Less desirable behavior: * toString() returns a fresh string every time. This could be prevented with some more bookkeeping but I'm not sure it's worth it. Everyone: feel free to use this any way you want. In particular, feel free to commit this to the Tango, Phobos and/or druntime repositories :) . Example: ===== $ cat test.d module test; import trace.stacktrace; // just so DSSS picks it up. void main() { foo(); } void foo() { bar(); } void bar() { throw new Exception("Just showing off"); } $ dsss build [[[snip]]] $ ./test object.Exception: Just showing off ---------------- ./test(class Exception object.Exception._ctor(char[], class Exception)+0x24) [0x42b174] ./test(void test.bar()+0x37) [0x4186ba] ./test(void test.foo()+0x9) [0x418681] ./test(_Dmain+0x9) [0x418671] ./test [0x42dece] ./test [0x42dfae] ./test [0x42e540] ./test [0x42dfae] ./test(_d_run_main+0xbb) [0x42e42b] /lib/libc.so.6(__libc_start_main+0xf4) [0x7fd1aacff1c4] ./test [0x4185d9] ===== Note: the trace may be wrapped in your newsreader. | |||||||||||||||||||||||||||||||||||||
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