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<h3>
Philip Carns pushed to branch carns/dev-wrapper-map-alias
at <a href="https://xgitlab.cels.anl.gov/darshan/darshan">darshan / darshan</a>
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Commits:
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<strong><a href="https://xgitlab.cels.anl.gov/darshan/darshan/commit/28797bf615aab8e18604e468429c4a9f6d8424fa">28797bf6</a></strong>
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<span>by Phil Carns</span>
<i>at 2020-03-18T13:57:38-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">use alias attribute rather than redirect macro
- redirect macro didn't preserve original symbol name as expected
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<h4>1 changed file:</h4>
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<a href="#119a98b56c5a26a2444f02d014efebfc94059524">
darshan-runtime/darshan.h
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<h4>Changes:</h4>
<li id="119a98b56c5a26a2444f02d014efebfc94059524">
<a href="https://xgitlab.cels.anl.gov/darshan/darshan/commit/28797bf615aab8e18604e468429c4a9f6d8424fa#119a98b56c5a26a2444f02d014efebfc94059524"><strong>darshan-runtime/darshan.h</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -34,16 +34,12 @@</td>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* creates P* variant of MPI symbols for LD_PRELOAD so that we can handle</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * language bindings that map to MPI or PMPI symbols under the covers.</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * See the following for an explanation of glibc __REDIRECT macro that's being</span></span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * used here. It creates an alias that points to the same function</span></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * definition. If we generated a wrapper to call the alias, then we risk</span></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * accidentally invoking the wrong symbol if multiple libraries are</span></span>
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<pre style="margin: 0;">-<span id="LC41" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * attempting to intercept the same function.</span></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * https://sourceware.org/git/?p=glibc.git;a=blob;f=misc/sys/cdefs.h;h=dd5f69f83385153899b7d8308f5732903d0a5999;hb=HEAD#l162</span></span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * We use an alias attribute rather than generating a function shim in order</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * to prevent accidental function call loop if there a conventional PMPI</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * profiler is attempting to intercept the same function name.</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define DARSHAN_WRAPPER_MAP(__func,__ret,__args,__fcall) \</span></span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> __ret __<span class="idiff left right">REDIRECT(__fcall, __args, __func</span>);</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> __ret __<span class="idiff left right">func __args __attribute__ ((alias (#__fcall))</span>);</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Map the desired function call to a pointer called __real_NAME at run</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * time. Note that we fall back to looking for the same symbol with a P</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -69,16 +65,12 @@</td>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* creates P* variant of MPI symbols for static linking so that we can handle</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * language bindings that map to MPI or PMPI symbols under the covers.</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">-<span id="LC72" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * See the following for an explanation of glibc __REDIRECT macro that's being</span></span>
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<pre style="margin: 0;">-<span id="LC73" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * used here. It creates an alias that points to the same function</span></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * definition. If we generated a wrapper to call the alias, then we risk</span></span>
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * accidentally invoking the wrong symbol if multiple libraries are</span></span>
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<pre style="margin: 0;">-<span id="LC76" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * attempting to intercept the same function.</span></span>
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<pre style="margin: 0;">-<span id="LC77" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">-<span id="LC78" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * https://sourceware.org/git/?p=glibc.git;a=blob;f=misc/sys/cdefs.h;h=dd5f69f83385153899b7d8308f5732903d0a5999;hb=HEAD#l162</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * We use an alias attribute rather than generating a function shim in order</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * to prevent accidental function call loop if there a conventional PMPI</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * profiler is attempting to intercept the same function name.</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define DARSHAN_WRAPPER_MAP(__func,__ret,__args,__fcall) \</span></span>
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<pre style="margin: 0;">-<span id="LC81" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> __ret __<span class="idiff left right">REDIRECT(__fcall, __args, __func</span>);</span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> __ret __<span class="idiff left right">func __args __attribute__ ((alias ("__wrap_" #__fcall))</span>);</span></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define MAP_OR_FAIL(__func)</span></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="c"></span>
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