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<div><div class="header">
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<div class="headertitle"><div class="title">C++ exceptions and longjmp </div></div>
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<div class="textblock"><h1><a class="anchor" id="doc_cpp_exceptions_1"></a>
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Exceptions</h1>
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<p>Application functions and class methods registered with the script engine are allowed to throw C++ exceptions. The virtual machine will automatically catch any C++ exception, abort the script execution, and return control to the application.</p>
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<div class="fragment"><div class="line"><a class="code hl_class" href="classas_i_script_context.html">asIScriptContext</a> *ctx = engine->CreateContext();</div>
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<div class="line">ctx-><a class="code hl_function" href="classas_i_script_context.html#a43976f42dfc6c1af23e132d36265173a">Prepare</a>(engine->GetModule(<span class="stringliteral">"test"</span>)->GetFunctionByName(<span class="stringliteral">"func"</span>));</div>
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<div class="line"><span class="keywordtype">int</span> r = ctx-><a class="code hl_function" href="classas_i_script_context.html#a8e52894432737acac2e1a422e496bf84">Execute</a>();</div>
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<div class="line"><span class="keywordflow">if</span>( r == <a class="code hl_enumvalue" href="angelscript_8h.html#a867f14b4137dd4602fda1e616b217a69aa3d548fa7d2278d848e50222b700c6c8">asEXECUTION_EXCEPTION</a> )</div>
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<div class="line">{</div>
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<div class="line"> <span class="keywordtype">string</span> err = ctx-><a class="code hl_function" href="classas_i_script_context.html#a0f0efea3955879074cfffa71991f780a">GetExceptionString</a>();</div>
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<div class="line"> <span class="keywordflow">if</span>( err == <span class="stringliteral">"Caught an exception from the application"</span> )</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// An application function threw an exception while being invoked from the script</span></div>
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<div class="line"> ...</div>
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<div class="line"> }</div>
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<div class="line">}</div>
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<div class="ttc" id="aangelscript_8h_html_a867f14b4137dd4602fda1e616b217a69aa3d548fa7d2278d848e50222b700c6c8"><div class="ttname"><a href="angelscript_8h.html#a867f14b4137dd4602fda1e616b217a69aa3d548fa7d2278d848e50222b700c6c8">asEXECUTION_EXCEPTION</a></div><div class="ttdeci">@ asEXECUTION_EXCEPTION</div><div class="ttdoc">The execution was terminated by an unhandled script exception.</div><div class="ttdef"><b>Definition:</b> angelscript.h:408</div></div>
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<div class="ttc" id="aclassas_i_script_context_html"><div class="ttname"><a href="classas_i_script_context.html">asIScriptContext</a></div><div class="ttdoc">The interface to the virtual machine.</div><div class="ttdef"><b>Definition:</b> angelscript.h:2735</div></div>
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<div class="ttc" id="aclassas_i_script_context_html_a0f0efea3955879074cfffa71991f780a"><div class="ttname"><a href="classas_i_script_context.html#a0f0efea3955879074cfffa71991f780a">asIScriptContext::GetExceptionString</a></div><div class="ttdeci">virtual const char * GetExceptionString()=0</div><div class="ttdoc">Returns the exception string text.</div></div>
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<div class="ttc" id="aclassas_i_script_context_html_a43976f42dfc6c1af23e132d36265173a"><div class="ttname"><a href="classas_i_script_context.html#a43976f42dfc6c1af23e132d36265173a">asIScriptContext::Prepare</a></div><div class="ttdeci">virtual int Prepare(asIScriptFunction *func)=0</div><div class="ttdoc">Prepares the context for execution of the function.</div></div>
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<div class="ttc" id="aclassas_i_script_context_html_a8e52894432737acac2e1a422e496bf84"><div class="ttname"><a href="classas_i_script_context.html#a8e52894432737acac2e1a422e496bf84">asIScriptContext::Execute</a></div><div class="ttdeci">virtual int Execute()=0</div><div class="ttdoc">Executes the prepared function.</div></div>
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</div><!-- fragment --><p>By default the VM has no way of distinguishing between different types of exceptions and will just give a standard exception string for all of them. If desired a <a class="el" href="classas_i_script_engine.html#addce6a202934a4918f7776b2f77c43fd">callback can be registered</a> with the engine to provide a translation of the exception type to a more informative exception string.</p>
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<div class="fragment"><div class="line"><span class="keywordtype">void</span> TranslateException(<a class="code hl_class" href="classas_i_script_context.html">asIScriptContext</a> *ctx, <span class="keywordtype">void</span>* <span class="comment">/*userParam*/</span>)</div>
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<div class="line">{</div>
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<div class="line"> <span class="keywordflow">try</span> </div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Retrow the original exception so we can catch it again</span></div>
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<div class="line"> <span class="keywordflow">throw</span>;</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">catch</span>( std::exception &e )</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Tell the VM the type of exception that occurred</span></div>
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<div class="line"> ctx-><a class="code hl_function" href="classas_i_script_context.html#a6f0f071215e0f7effc0b765043f01275">SetException</a>(e.what());</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">catch</span>(...)</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// The callback must not allow any exception to be thrown, but it is not necessary </span></div>
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<div class="line"> <span class="comment">// to explicitly set an exception string if the default exception string is sufficient</span></div>
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<div class="line"> }</div>
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<div class="line">}</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Register the callback with the engine</span></div>
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<div class="line">engine->SetTranslateAppExceptionCallback(<a class="code hl_define" href="angelscript_8h.html#a78f8f2c7f1c88b12e74a5ac47b4184ae">asFUNCTION</a>(TranslateException), 0, <a class="code hl_enumvalue" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a68ae43cc91cdfc3fa4590c9e6164e4f4">asCALL_CDECL</a>);</div>
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<div class="ttc" id="aangelscript_8h_html_a3ec92ea3c4762e44c2df788ceccdd1e4a68ae43cc91cdfc3fa4590c9e6164e4f4"><div class="ttname"><a href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a68ae43cc91cdfc3fa4590c9e6164e4f4">asCALL_CDECL</a></div><div class="ttdeci">@ asCALL_CDECL</div><div class="ttdoc">A cdecl function.</div><div class="ttdef"><b>Definition:</b> angelscript.h:230</div></div>
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<div class="ttc" id="aangelscript_8h_html_a78f8f2c7f1c88b12e74a5ac47b4184ae"><div class="ttname"><a href="angelscript_8h.html#a78f8f2c7f1c88b12e74a5ac47b4184ae">asFUNCTION</a></div><div class="ttdeci">#define asFUNCTION(f)</div><div class="ttdoc">Returns an asSFuncPtr representing the function specified by the name.</div><div class="ttdef"><b>Definition:</b> angelscript.h:685</div></div>
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<div class="ttc" id="aclassas_i_script_context_html_a6f0f071215e0f7effc0b765043f01275"><div class="ttname"><a href="classas_i_script_context.html#a6f0f071215e0f7effc0b765043f01275">asIScriptContext::SetException</a></div><div class="ttdeci">virtual int SetException(const char *info, bool allowCatch=true)=0</div><div class="ttdoc">Sets an exception, which aborts the execution.</div></div>
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</div><!-- fragment --><dl class="section see"><dt>See also</dt><dd><a class="el" href="doc_addon_helpers.html">GetExceptionInfo</a> helper function</dd></dl>
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<dl class="section note"><dt>Note</dt><dd>The ability to catch exceptions can be turned off by compiling the library with the AS_NO_EXCEPTIONS defined. If this is done, the application should not register any functions that may throw exceptions, as the end result will be undefined should an exception occur.</dd></dl>
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<h1><a class="anchor" id="doc_cpp_exceptions_2"></a>
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longjmp</h1>
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<p>Some applications uses longjmp to do error handling. When performing a longjmp to a previously saved state, there is no chance for the code to do a cleanup of all that happened after the saved state. Because of that the application must not register functions that can perform a longjmp out from the function, as that can leave the virtual machine in an undefined state. </p>
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<li class="footer">Generated on Sun May 21 2023 10:12:40 for AngelScript by <a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.6 </li>
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