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[Bug translator/20394] New: inconsistency in exe/library paths searching between @cast() and process.library.function probes
- From: "dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Thu, 21 Jul 2016 14:55:03 +0000
- Subject: [Bug translator/20394] New: inconsistency in exe/library paths searching between @cast() and process.library.function probes
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=20394
Bug ID: 20394
Summary: inconsistency in exe/library paths searching between
@cast() and process.library.function probes
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
Assignee: systemtap at sourceware dot org
Reporter: dsmith at redhat dot com
Target Milestone: ---
When writing probes, you can do the following:
====
probe
process("python").library("libpython2.7.so*").function("PyEval_EvalFrameEx")
{
# ... probe contents here ...
}
====
Notice that I'm just probing "python" as the "process" argument, a non-absolute
path. The translator will look up "python" in my PATH and find it. Notice I'm
using a wildcarded and non-absolute path for the "library" argument.
The above works fine and is very user friendly.
So, when using @cast(), I'd like to specify the symbol search path the same
way:
====
# cat pytest1.stp
function foo:long(object:long)
{
printf("%d\n",
@cast(object, "PyFrameObject", "python:libpython2.7.so*")->f_lineno)
}
probe
process("python").library("libpython2.7.so*").function("PyEval_EvalFrameEx")
{
foo($f)
exit()
}
# stap -v ./pytest1.stp -c "python -c 'import sys; sys.exit(0)'"
Pass 1: parsed user script and 117 library scripts using
242808virt/39472res/7568shr/32212data kb, in 190usr/30sys/234real ms.
semantic error: while processing function foo
semantic error: type definition 'PyFrameObject' not found in
'python:libpython2.7.so*': operator '@cast' at ./pytest1.stp:4:3
source: @cast(object, "PyFrameObject",
"python:libpython2.7.so*")->f_lineno)
^
Pass 2: analyzed script: 1 probe, 1 function, 0 embeds, 0 globals using
250612virt/48776res/8880shr/40016data kb, in 120usr/380sys/498real ms.
Pass 2: analysis failed. [man error::pass2]
====
So, that didn't work. Let's try without the wildcard:
====
# cat pytest2.stp
function foo:long(object:long)
{
printf("%d\n",
@cast(object, "PyFrameObject", "python:libpython2.7.so")->f_lineno)
}
probe
process("python").library("libpython2.7.so*").function("PyEval_EvalFrameEx")
{
foo($f)
exit()
}
# stap -v ./pytest2.stp -c "python -c 'import sys; sys.exit(0)'"
Pass 1: parsed user script and 117 library scripts using
242808virt/39644res/7740shr/32212data kb, in 200usr/40sys/240real ms.
semantic error: while processing function foo
semantic error: type definition 'PyFrameObject' not found in
'python:libpython2.7.so': operator '@cast' at ./pytest2.stp:4:3
source: @cast(object, "PyFrameObject",
"python:libpython2.7.so")->f_lineno)
^
Pass 2: analyzed script: 1 probe, 3 functions, 0 embeds, 0 globals using
250608virt/48792res/8892shr/40012data kb, in 100usr/400sys/511real ms.
Pass 2: analysis failed. [man error::pass2]
====
OK, on this system /usr/lib64/libpython2.7.so is a symbolic link to
/usr/lib64/libpython2.7.so.1.0. Let's give that a shot:
====
# cat pytest3.stp
function foo:long(object:long)
{
printf("%d\n",
@cast(object, "PyFrameObject",
"python:libpython2.7.so.1.0")->f_lineno)
}
probe
process("python").library("libpython2.7.so*").function("PyEval_EvalFrameEx")
{
foo($f)
exit()
}
# stap -v ./pytest3.stp -c "python -c 'import sys; sys.exit(0)'"
Pass 1: parsed user script and 117 library scripts using
242804virt/39504res/7604shr/32208data kb, in 210usr/30sys/242real ms.
semantic error: while processing function foo
semantic error: type definition 'PyFrameObject' not found in
'python:libpython2.7.so.1.0': operator '@cast' at ./pytest3.stp:4:3
source: @cast(object, "PyFrameObject",
"python:libpython2.7.so.1.0")->f_lineno)
^
Pass 2: analyzed script: 1 probe, 1 function, 0 embeds, 0 globals using
250608virt/48804res/8912shr/40012data kb, in 100usr/370sys/492real ms.
Pass 2: analysis failed. [man error::pass2]
====
Nope.
The only thing I can seem to get to work for @cast() is a full absolute path to
the library. One reason why this is annoying is that to handle both 32-bit
distros and 64-bit distros, I'll have to specify the library in both /usr/lib/
and /usr/lib64:
====
# cat pytest4.stp
function foo:long(object:long)
{
printf("%d\n",
@cast(object, "PyFrameObject",
"python:/usr/lib64/libpython2.7.so:/usr/lib/libpython2.7.so")->f_lineno)
}
probe
process("python").library("libpython2.7.so*").function("PyEval_EvalFrameEx")
{
foo($f)
exit()
}
# stap -v ./pytest4.stp -c "python -c 'import sys; sys.exit(0)'"
Pass 1: parsed user script and 117 library scripts using
242808virt/39712res/7812shr/32212data kb, in 210usr/30sys/238real ms.
Pass 2: analyzed script: 1 probe, 4 functions, 0 embeds, 0 globals using
251388virt/49532res/8828shr/40792data kb, in 120usr/190sys/317real ms.
Pass 3: translated to C into
"/tmp/stapYGfpK4/stap_d4c98f72a2d5b7cef816271d6bd3e397_3084_src.c" using
251388virt/49724res/9020shr/40792data kb, in 20usr/190sys/206real ms.
Pass 4: compiled C into "stap_d4c98f72a2d5b7cef816271d6bd3e397_3084.ko" in
4730usr/1000sys/5459real ms.
Pass 5: starting run.
59
Pass 5: run completed in 30usr/70sys/392real ms.
====
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