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1 {{+bindTo:partials.standard_nacl_article}} | 1 {{+bindTo:partials.standard_nacl_article}} |
2 | 2 |
3 <section id="pnacl-c-c-language-support"> | 3 <section id="pnacl-c-c-language-support"> |
4 <h1 id="pnacl-c-c-language-support">PNaCl C/C++ Language Support</h1> | 4 <h1 id="pnacl-c-c-language-support">PNaCl C/C++ Language Support</h1> |
5 <div class="contents local" id="contents" style="display: none"> | 5 <div class="contents local" id="contents" style="display: none"> |
6 <ul class="small-gap"> | 6 <ul class="small-gap"> |
7 <li><p class="first"><a class="reference internal" href="#source-language-suppor
t" id="id3">Source language support</a></p> | 7 <li><p class="first"><a class="reference internal" href="#source-language-suppor
t" id="id3">Source language support</a></p> |
8 <ul class="small-gap"> | 8 <ul class="small-gap"> |
9 <li><a class="reference internal" href="#versions" id="id4">Versions</a></li> | 9 <li><a class="reference internal" href="#versions" id="id4">Versions</a></li> |
10 <li><a class="reference internal" href="#preprocessor-definitions" id="id5">Prep
rocessor definitions</a></li> | 10 <li><a class="reference internal" href="#preprocessor-definitions" id="id5">Prep
rocessor definitions</a></li> |
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156 restrictions beyond C’s.</p> | 156 restrictions beyond C’s.</p> |
157 <h2 id="c-exception-handling"><span id="exception-handling"></span>C++ Exception
Handling</h2> | 157 <h2 id="c-exception-handling"><span id="exception-handling"></span>C++ Exception
Handling</h2> |
158 <p>PNaCl currently supports C++ exception handling through <code>setjmp()</code>
and | 158 <p>PNaCl currently supports C++ exception handling through <code>setjmp()</code>
and |
159 <code>longjmp()</code>, which can be enabled with the <code>--pnacl-exceptions=s
jlj</code> linker | 159 <code>longjmp()</code>, which can be enabled with the <code>--pnacl-exceptions=s
jlj</code> linker |
160 flag (set with <code>LDFLAGS</code> when using Make). Exceptions are disabled by
default | 160 flag (set with <code>LDFLAGS</code> when using Make). Exceptions are disabled by
default |
161 so that faster and smaller code is generated, and <code>throw</code> statements
are | 161 so that faster and smaller code is generated, and <code>throw</code> statements
are |
162 replaced with calls to <code>abort()</code>. The usual <code>-fno-exceptions</co
de> flag is also | 162 replaced with calls to <code>abort()</code>. The usual <code>-fno-exceptions</co
de> flag is also |
163 supported, though the default is <code>-fexceptions</code>. PNaCl will support f
ull | 163 supported, though the default is <code>-fexceptions</code>. PNaCl will support f
ull |
164 zero-cost exception handling in the future.</p> | 164 zero-cost exception handling in the future.</p> |
165 <aside> | 165 <aside> |
166 When using <a class="reference external" href="https://code.google.com/p/naclpor
ts">naclports</a> or other prebuilt static libraries, you don’t | 166 When using <a class="reference external" href="https://chromium.googlesource.com
/webports">webports</a> or other prebuilt static libraries, you don’t |
167 need to recompile because the exception handling support is | 167 need to recompile because the exception handling support is |
168 implemented at link time (when all the static libraries are put | 168 implemented at link time (when all the static libraries are put |
169 together with your application). | 169 together with your application). |
170 </aside> | 170 </aside> |
171 <p>NaCl supports full zero-cost C++ exception handling.</p> | 171 <p>NaCl supports full zero-cost C++ exception handling.</p> |
172 <h2 id="inline-assembly">Inline Assembly</h2> | 172 <h2 id="inline-assembly">Inline Assembly</h2> |
173 <p>Inline assembly isn’t supported by PNaCl because it isn’t portabl
e. The | 173 <p>Inline assembly isn’t supported by PNaCl because it isn’t portabl
e. The |
174 one current exception is the common compiler barrier idiom | 174 one current exception is the common compiler barrier idiom |
175 <code>asm("":::"memory")</code>, which gets transformed to a
sequentially | 175 <code>asm("":::"memory")</code>, which gets transformed to a
sequentially |
176 consistent memory barrier (equivalent to <code>__sync_synchronize()</code>). In | 176 consistent memory barrier (equivalent to <code>__sync_synchronize()</code>). In |
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438 <p>Neither PNaCl nor NaCl currently support asynchronous interruption | 438 <p>Neither PNaCl nor NaCl currently support asynchronous interruption |
439 or suspension of threads.</p> | 439 or suspension of threads.</p> |
440 </li> | 440 </li> |
441 </ul> | 441 </ul> |
442 <p>If PNaCl were to support either of these, the interaction of | 442 <p>If PNaCl were to support either of these, the interaction of |
443 <code>volatile</code> and atomics with same-thread signal handling would need | 443 <code>volatile</code> and atomics with same-thread signal handling would need |
444 to be carefully detailed.</p> | 444 to be carefully detailed.</p> |
445 </section> | 445 </section> |
446 | 446 |
447 {{/partials.standard_nacl_article}} | 447 {{/partials.standard_nacl_article}} |
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