Re: [RFA 2/4] dwarf2_physname

[Daniel Jacobowitz <drow@false.org>]

On Fri, Nov 20, 2009 at 01:19:35PM -0800, Keith Seitz wrote:
> The attached patch is the real "meat and potatoes" of the thing. It
> includes much of the earlier patches that I posted on August 31,
> except that this leaves out none of the details.

Actually reviewing this is going to take more time than I have today,
but the first thing I wanted to do was drop it into my RealView test
harness and see what happened.  Across three RealView multilibs and
two ARM GCC multilibs:

495 FAIL -> PASS
75 New FAIL
130 PASS -> FAIL
87 Removed FAIL
3 Removed KPASS
6 UNRESOLVED -> PASS

Pretty good.  A few of the failures were related to another patch I
had on my last test run which is still pending.  Some of the
PASS -> FAIL are with GCC though.

I am generally opposed to committing known regressions.  If there are
supporting patches we need to get in first, let's do that; if there
are tests we decide to break, let's XFAIL or KFAIL them.  That's the
only way we can make the testsuite more useful.

The related regressions, just with arm-none-eabi GCC and the default
multilib:

PASS -> FAIL: default/gdb.sum:gdb.base/code-expr.exp: (@code signed long)
PASS -> FAIL: default/gdb.sum:gdb.base/code-expr.exp: (@data signed long)
PASS -> FAIL: default/gdb.sum:gdb.base/code-expr.exp: (signed long @code)
PASS -> FAIL: default/gdb.sum:gdb.base/code-expr.exp: (signed long @data)
PASS -> FAIL: default/gdb.sum:gdb.base/cvexpr.exp: (const signed long)
PASS -> FAIL: default/gdb.sum:gdb.base/cvexpr.exp: (signed long const)
PASS -> FAIL: default/gdb.sum:gdb.base/cvexpr.exp: (signed long volatile)
PASS -> FAIL: default/gdb.sum:gdb.base/cvexpr.exp: (volatile signed long)
PASS -> FAIL: default/gdb.sum:gdb.cp/exception.exp: backtrace after first catch
PASS -> FAIL: default/gdb.sum:gdb.cp/exception.exp: backtrace after first throw
PASS -> FAIL: default/gdb.sum:gdb.cp/exception.exp: backtrace after second catch
PASS -> FAIL: default/gdb.sum:gdb.cp/exception.exp: backtrace after second throw
PASS -> FAIL: default/gdb.sum:gdb.cp/namespace.exp: print X
PASS -> FAIL: default/gdb.sum:gdb.cp/namespace.exp: print cX

I'm going to skip the RealView regressions; those I'm willing to
handle in followups.  Most template tests still fail with RealView.
Some tests from namespace.exp improved, others regressed.

Any idea what the above failures might be?  I can send you logs
offlist, they're large.

> Some warnings are in order. First, this is probably going to really
> slow down large C++ applications, because we no longer use
> DW_AT_MIPS_linkage_name as generated from the compiler. We
> essentially build this name during DIE reading.

We need to quantify the impact on a couple of C++ code bases, I think.

-- 
Daniel Jacobowitz
CodeSourcery