[Bug python/17409] New: Built-in python doesn't see an arguments to the function

[Bug python/17409] New: Built-in python doesn't see an arguments to the function

[hi-angel at yandex dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=17409

            Bug ID: 17409
           Summary: Built-in python doesn't see an arguments to the
                    function
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: minor
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: hi-angel at yandex dot ru

Python in a script don't see a transmitted arguments. Here's a test function:

define test
  p $arg0
python
print(str(gdb.parse_and_eval("$arg0")))
end
end

It takes one string as an argument, and just prints it at first from the
outside, and at second from within of a python block. But as the result instead
of a string you will see in second time «void».

A workaround for the present time is to assign $arg0 to something else. E.g. 

define test
  set $MyVar = $arg0
python
print(str(gdb.parse_and_eval("$MyVar")))
end
end

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From: "martin at minimum dot se" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/17384] android arm gdb "Cannot access memory at address"
 when I "stepi" over "blx"
Date: Thu, 18 Sep 2014 14:56:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id\x17384

--- Comment #17 from molsson <martin at minimum dot se> ---
The things that makes me believe that I do have symbols available is A) it says
"Yes" in the "Syms" column of the libblink_web.cr.so line in "info
sharedlibrary", also if I trace all executed commands during the build process
I can see that RenderFullscreen.cpp is built with "-g" parameter.

FWIW, the list of CFLAGS (I'm skipping a metric ton of -D and -I switches) is:

-fstack-protector --param=ssp-buffer-size=4 -Werror -fno-exceptions
-fno-strict-aliasing -Wall -Wno-unused-parameter
-Wno-missing-field-initializers -fvisibility=hidden -pipe -fPIC
-Wno-unused-local-typedefs -march=armv7-a -mtune=generic-armv7-a
-mfpu=vfpv3-d16 -mfloat-abi=softfp -mthumb -fno-tree-sra -fno-partial-inlining
-fno-early-inlining -fno-tree-copy-prop -fno-tree-loop-optimize
-fno-move-loop-invariants -fno-caller-saves -Wno-psabi -mthumb-interwork
-ffunction-sections -funwind-tables -g -fstack-protector -fno-short-enums
-finline-limitd -Wa,--noexecstack
--sysroot=..../third_party/android_tools/ndk/platforms/android-14/arch-arm
-isystem..../third_party/android_tools/ndk/sources/cxx-stl/stlport/stlport -O0
-g -funwind-tables -fdiagnostics-color=always -fno-rtti -fno-threadsafe-statics
-fvisibility-inlines-hidden -Wsign-compare -Wno-c++0x-compat -Wno-abi
-std=gnu++11 -Wno-narrowing -Wno-literal-suffix

Notably, I'm also not passing -fomit-frame-pointer for this file at least (if I
grep for "omit-frame-pointer" I see several hits in the chromium tree but I'm
not sure which platforms or files etc use it).

Also, I can put a breakpoint on certain other functions like for example
base::debug::TaskAnnotator::RunTask() and there I can use "next" without
problems so there seems to be something special with
blink::RenderFullScreen::createPlaceholder() or possibly with one of the
functions it calls. Maybe something with inlining, or maybe because it's
static, not sure.

I will try to put some breakpoints near the unwind selection tomorrow and get
back with more info on that.

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[Bug python/17409] Built-in python doesn't see an arguments to the function

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17409

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
I'm somewhat inclined to WONTFIX this, since one point
of Python is that you can write new commands without relying
on gdb's pretty buggy approach to command arguments to 'define'.

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