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authorHoward Hinnant <hhinnant@apple.com>2011-07-14 20:16:50 +0000
committerHoward Hinnant <hhinnant@apple.com>2011-07-14 20:16:50 +0000
commit7123bcb3bbbcc33c69666d4f0f83052b9a64a7fb (patch)
treebfc2dae7fc1166fa93da157ac102874cdbb2b9ac /www/spec.html
parent889b02d72d523ba716ce08403c284e60f0a9431d (diff)
A stawman specification for libc++abi and status page
git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@135181 91177308-0d34-0410-b5e6-96231b3b80d8
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
+ "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+ <title>libc++abi spec</title>
+</head>
+<body>
+
+<table border=1>
+<tr>
+<th rowspan=2>libc++abi Specification</th>
+<th colspan=3>Completed ?</th>
+</tr>
+
+<tr>
+<th>dawin</th><th>linux</th><th>arm</th>
+</tr>
+
+<tr>
+<td colspan=4 align="center">Memory management</td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void* __cxa_allocate_exception(size_t thrown_size) throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Allocates <tt>thrown_size</tt> bytes of memory. If memory
+can not be allocated, call <tt>std::terminate()</tt>.
+</p>
+<p>
+<i>Returns:</i> A pointer to the allocated memory.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_free_exception(void * thrown_exception) throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Deallocates the memory pointed to.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td colspan=4 align="center">Exception Handling</td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_throw(void* thrown_exception, struct std::type_info * tinfo,
+ void (*dest)(void*));</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void* __cxa_get_exception_ptr(void* exceptionObject) throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Returns:</i> The adjusted pointer to the exception object. (The adjusted
+pointer is typically computed by the personality routine during phase 1 and
+saved in the exception object.)
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void* __cxa_begin_catch(void* exceptionObject) throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+<ul>
+<li>Increment's the exception's handler count.</li>
+<li>Places the exception on the stack of currently-caught exceptions if it is
+not already there, linking the exception to the previous top of the stack.</li>
+<li>Decrements the uncaught_exception count.</li>
+</ul>
+<p>
+If the initialization of the catch parameter is trivial (e,g., there is no
+formal catch parameter, or the parameter has no copy constructor), the calls to
+<tt>__cxa_get_exception_ptr()</tt> and <tt>__cxa_begin_catch()</tt> may be
+combined into a single call to <tt>__cxa_begin_catch()</tt>.
+</p>
+<p>
+When the personality routine encounters a termination condition, it will call
+<tt>__cxa_begin_catch()</tt> to mark the exception as handled and then call
+<tt>terminate()</tt>, which shall not return to its caller.
+</p>
+<p>
+<i>Returns:</i> The adjusted pointer to the exception object.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_end_catch();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Locates the most recently caught exception and decrements its
+handler count. Removes the exception from the caughtÓexception stack, if the
+handler count goes to zero. Destroys the exception if the handler count goes to
+zero, and the exception was not re-thrown by throw. Collaboration between
+__cxa_rethrow() and __cxa_end_catch() is necessary to handle the last point.
+Though implementation-defined, one possibility is for __cxa_rethrow() to set a
+flag in the handlerCount member of the exception header to mark an exception
+being rethrown.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>std::type_info* __cxa_current_exception_type();</code>
+</p>
+<blockquote>
+<p>
+<i>Returns:</i> the type of the currently handled exception, or null if there
+are no caught exceptions.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_rethrow();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Marks the exception object on top of the caughtExceptions stack
+(in an implementation-defined way) as being rethrown. If the caughtExceptions
+stack is empty, it calls terminate() (see [C++FDIS] [except.throw], 15.1.8). It
+then returns to the handler that called it, which must call __cxa_end_catch(),
+perform any necessary cleanup, and finally call _Unwind_Resume() to continue
+unwinding.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void* __cxa_current_primary_exception() throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Increments the ownership count of the currently handled
+exception (if any) by one.
+</p>
+<p>
+<i>Returns:</i> the type of the currently handled exception, or null if there
+are no caught exceptions.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_decrement_exception_refcount(void* primary_exception) throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Decrements the ownership count of the exception by 1, and on
+zero calls <tt>_Unwind_DeleteException</tt> with the exception object.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>__cxa_eh_globals* __cxa_get_globals() throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Returns:</i> A pointer to the __cxa_eh_globals structure for the current
+thread, initializing it if necessary.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>__cxa_eh_globals* __cxa_get_globals_fast() throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Requires:</i> At least one prior call to __cxa_get_globals has been made from
+the current thread.
+</p>
+<p>
+<i>Returns:</i> A pointer to the __cxa_eh_globals structure for the current
+thread.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_increment_exception_refcount(void* primary_exception) throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Increments the ownership count of the referenced exception.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_rethrow_primary_exception(void* primary_exception);</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Implements <tt>std::rethrow_exception(exception_ptr p)</tt>.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>bool __cxa_uncaught_exception() throw();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+<p>
+<i>Returns:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>_Unwind_Reason_Code __gxx_personality_v0
+ (int, _Unwind_Action, _Unwind_Exception_Class,
+ struct _Unwind_Exception *, struct _Unwind_Context *);</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+<p>
+<i>Returns:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td colspan=4 align="center">Guard objects</td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>int __cxa_guard_acquire(uint64_t* guard_object);</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> This function is called before initialization takes place. If
+this function returns 1, either <code>__cxa_guard_release</code> or
+<code>__cxa_guard_abort</code> must be called with the same argument. The first
+byte of the <code>guard_object</code> is not modified by this function.
+</p>
+<p>
+On Darwin the implementation checks for deadlock.
+</p>
+<p>
+<i>Returns:</i> 1 if the initialization is not yet complete, otherwise 0.
+</p>
+</blockquote>
+</td>
+<td>&#10003;</td>
+<td>&#10003;</td>
+<td>&#10003;</td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_guard_release(uint64_t*);</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Sets the first byte of the guard object to a non-zero value.
+This function is called after initialization is complete. A thread-safe
+implementation will release the mutex acquired by __cxa_guard_acquire after
+setting the first byte of the guard object.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_guard_abort(uint64_t*);</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> This function is called if the initialization terminates by
+throwing an exception.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td colspan=4 align="center">Vector construction and destruction</td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void* __cxa_vec_new(size_t element_count,
+ size_t element_size,
+ size_t padding_size,
+ void (*constructor)(void*),
+ void (*destructor)(void*) );</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+<p>
+<i>Returns:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void* __cxa_vec_new2(size_t element_count,
+ size_t element_size,
+ size_t padding_size,
+ void (*constructor)(void*),
+ void (*destructor)(void*),
+ void* (*alloc)(size_t),
+ void (*dealloc)(void*) );</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+<p>
+<i>Returns:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void* __cxa_vec_new3(size_t element_count,
+ size_t element_size,
+ size_t padding_size,
+ void (*constructor)(void*),
+ void (*destructor)(void*),
+ void* (*alloc)(size_t),
+ void (*dealloc)(void*, size_t) );</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+<p>
+<i>Returns:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_vec_ctor(void* array_address,
+ size_t element_count,
+ size_t element_size,
+ void (*constructor)(void*),
+ void (*destructor)(void*) );</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_vec_dtor(void* array_address,
+ size_t element_count,
+ size_t element_size,
+ void (*destructor)(void*) );</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_vec_cleanup(void* array_address,
+ size_t element_count,
+ size_t element_size,
+ void (*destructor)(void*) );</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_vec_delete(void* array_address,
+ size_t element_size,
+ size_t padding_size,
+ void (*destructor)(void*) );</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_vec_delete2(void* array_address,
+ size_t element_size,
+ size_t padding_size,
+ void (*destructor)(void*),
+ void (*dealloc)(void*) );</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_vec_delete3(void* __array_address,
+ size_t element_size,
+ size_t padding_size,
+ void (*destructor)(void*),
+ void (*dealloc) (void*, size_t));</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_vec_cctor(void* dest_array,
+ void* src_array,
+ size_t element_count,
+ size_t element_size,
+ void (*constructor) (void*, void*),
+ void (*destructor)(void*) );</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td colspan=4 align="center">Handlers</td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void (*__cxa_new_handler)();</code>
+</p>
+<blockquote>
+<p>
+The currently installed new handler.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void (*__cxa_terminate_handler)();</code>
+</p>
+<blockquote>
+<p>
+The currently installed terminate handler.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void (*__cxa_unexpected_handler)();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+
+
+<tr>
+<td colspan=4 align="center">Utilities</td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>[[noreturn]] void __cxa_bad_cast()</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Throws an exception of type <tt>bad_cast</tt>.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>[[noreturn]] void __cxa_bad_typeid();</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Throws an exception of type <tt>bad_typeid</tt>.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_pure_virtual(void);</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Called if the user calls a non-overridden pure virtual function,
+which has undefined behavior according to the C++ Standard. Ends the program.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void __cxa_call_unexpected (void*) __attribute__((noreturn));</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i> Handles re-checking the exception specification if
+unexpectedHandler throws, and if <tt>bad_exception</tt> needs to be thrown.
+Called from the compiler.
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>char* __cxa_demangle(const char* mangled_name,
+ char* output_buffer,
+ size_t* length,
+ int* status);</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+<p>
+<i>Returns:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+<tr>
+<td>
+<p>
+<code>void*
+ __dynamic_cast(const void* __src_ptr,
+ const __class_type_info* __src_type,
+ const __class_type_info* __dst_type,
+ ptrdiff_t __src2dst);</code>
+</p>
+<blockquote>
+<p>
+<i>Effects:</i>
+</p>
+<p>
+<i>Returns:</i>
+</p>
+</blockquote>
+</td>
+<td></td>
+<td></td>
+<td></td>
+</tr>
+
+</table>
+
+<!--
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+000000000000cfd0 (__DATA,__const) external typeinfo for std::nullptr_t
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+000000000000d530 (__DATA,__const) external typeinfo for char16_t*
+000000000000d5a0 (__DATA,__const) external typeinfo for char32_t const*
+000000000000d000 (__DATA,__const) external typeinfo for std::nullptr_t const*
+000000000000d550 (__DATA,__const) external typeinfo for char16_t const*
+000000000000d190 (__DATA,__const) external typeinfo for signed char const*
+000000000000d050 (__DATA,__const) external typeinfo for bool const*
+000000000000d0f0 (__DATA,__const) external typeinfo for char const*
+000000000000d4b0 (__DATA,__const) external typeinfo for double const*
+000000000000d500 (__DATA,__const) external typeinfo for long double const*
+000000000000d460 (__DATA,__const) external typeinfo for float const*
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+000000000000d2d0 (__DATA,__const) external typeinfo for unsigned int const*
+000000000000d320 (__DATA,__const) external typeinfo for long const*
+000000000000d370 (__DATA,__const) external typeinfo for unsigned long const*
+000000000000d1e0 (__DATA,__const) external typeinfo for short const*
+000000000000d230 (__DATA,__const) external typeinfo for unsigned short const*
+000000000000cfb0 (__DATA,__const) external typeinfo for void const*
+000000000000d0a0 (__DATA,__const) external typeinfo for wchar_t const*
+000000000000d3c0 (__DATA,__const) external typeinfo for long long const*
+000000000000d410 (__DATA,__const) external typeinfo for unsigned long long const*
+000000000000d170 (__DATA,__const) external typeinfo for signed char*
+000000000000d030 (__DATA,__const) external typeinfo for bool*
+000000000000d0d0 (__DATA,__const) external typeinfo for char*
+000000000000d490 (__DATA,__const) external typeinfo for double*
+000000000000d4e0 (__DATA,__const) external typeinfo for long double*
+000000000000d440 (__DATA,__const) external typeinfo for float*
+000000000000d120 (__DATA,__const) external typeinfo for unsigned char*
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+000000000000ce30 (__DATA,__const) external vtable for __cxxabiv1::__enum_type_info
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+000000000000cf10 (__DATA,__const) external vtable for __cxxabiv1::__pointer_to_member_type_info
+
+ (undefined) external ___stack_chk_fail (from libSystem)
+ (undefined) external ___stack_chk_guard (from libSystem)
+ (undefined) external ___stderrp (from libSystem)
+ (undefined) external ___strcat_chk (from libSystem)
+ (undefined) external _abort (from libSystem)
+ (undefined) external _calloc (from libSystem)
+ (undefined) external _dlsym (from libSystem)
+ (undefined) external _free (from libSystem)
+ (undefined) external _malloc (from libSystem)
+ (undefined) external _memcpy (from libSystem)
+ (undefined) external _pthread_getspecific (from libSystem)
+ (undefined) external _pthread_key_create (from libSystem)
+ (undefined) external _pthread_mutex_init (from libSystem)
+ (undefined) external _pthread_mutex_lock (from libSystem)
+ (undefined) external _pthread_mutex_unlock (from libSystem)
+ (undefined) external _pthread_mutexattr_init (from libSystem)
+ (undefined) external _pthread_mutexattr_settype (from libSystem)
+ (undefined) external _pthread_once (from libSystem)
+ (undefined) external _pthread_setspecific (from libSystem)
+ (undefined) external _realloc (from libSystem)
+ (undefined) external _strcmp (from libSystem)
+ (undefined) external _strcpy (from libSystem)
+ (undefined) external _strlen (from libSystem)
+ (undefined) external _strncmp (from libSystem)
+ (undefined) external _vasprintf (from libSystem)
+ (undefined) external _vfprintf (from libSystem)
+ (undefined) external dyld_stub_binder (from libSystem)
+ (undefined) external __Unwind_DeleteException (from libSystem)
+ (undefined) external __Unwind_GetIP (from libSystem)
+ (undefined) external __Unwind_GetLanguageSpecificData (from libSystem)
+ (undefined) external __Unwind_GetRegionStart (from libSystem)
+ (undefined) external __Unwind_RaiseException (from libSystem)
+ (undefined) external __Unwind_Resume_or_Rethrow (from libSystem)
+ (undefined) external __Unwind_SetGR (from libSystem)
+ (undefined) external __Unwind_SetIP (from libSystem)
+ (undefined) external ___bzero (from libSystem)
+ -->
+
+</body>
+</html>