Runtime Hooks

This page lists runtime functions to which the compiler may automatically generate calls to in certain circumstances. This list was taken from dmd's backend/rtlsym.h.

This list is not complete and may even list functions which are no longer needed. Please help to verify this list.

hooks for associative array support

mangled name	calling convention	description	druntime definition	comment
_aaApply	extern(C)		rt/aaA.d
_aaApply2	extern(C)		rt/aaA.d
_aaDelX	extern(C)		rt/aaA.d
_aaEqual	extern(C)		rt/aaA.d
_aaGetRvalueX	extern(C)		rt/aaA.d
_aaGetX	extern(C)		rt/aaA.d
_aaInX	extern(C)		rt/aaA.d
_aaLen	extern(C)		rt/aaA.d
_d_assocarrayliteralT	extern(C)		rt/aaA.d
_d_assocarrayliteralTX	extern(C)		rt/aaA.d

dynamic array support

mangled name	calling convention	description	druntime definition	comment
_adCmp	extern(C)	Compare arrays	rt/adi.d
_adCmp2	extern(C)	Compare arrays	rt/adi.d	What's the difference to _adCmp?
_adCmpBit	???		???	Can't find this in druntime. Deprecated?
_adCmpChar	extern(C)	Compare arrays	rt/adi.d
_adDupT	extern(C)	Implement .dup property	rt/lifetime.d
_adEq	extern(C)	array equality test	rt/adi.d
_adEq2	extern(C)	array equality test	rt/adi.d
_adEqBit	???		???	Can't find this in druntime. Deprecated?
_adReverse	extern(C)	implement .reverse property (generic)	rt/adi.d
_adReverseChar	extern(C)	implement .reverse property (char array)	rt/adi.d
_adReverseWchar	extern(C)	implement .reverse property (wchar array)	rt/adi.d
_adSort	extern(C)	Implement .sort property (generic)	rt/qsort.d
_adSortChar	extern(C)	Implement .sort property (char array)	rt/adi.d
_adSortWchar	extern(C)	Implement .sort property (wchar array)	rt/adi.d

hooks for exception support

mangled name	calling convention	description	druntime definition	comment
_d_throw	???		???
_d_throw@4	???		???
_d_throwc	extern(C)		rt/deh2.d

hooks for unit test support

mangled name	calling convention	description	druntime definition	comment
_d_unittest	extern(C)		rt/dmain2.d
_d_unittest_msg	extern(C)		rt/dmain2.d
_d_unittestm	extern(C)		rt/dmain2.d

hooks for thread support

mangled name	calling convention	description	druntime definition	comment
___tls_get_addr	extern(D)	Returns the thread local address of a variable. Used to emulate thread local storage on Mac OS X.	core/thread.d	Only used on Mac OS X.

hooks for GC support

mangled name	calling convention	description	druntime definition	comment
RTInfo	(not a function)	Used to create runtime type information which can then be obtained by the GC at runtime.	object_.d	This is a template which gets instantiated for every type.

utf decoding for foreach loops

_aApplycd1	extern(C)		rt/aApply.d
_aApplycd2	extern(C)		rt/aApply.d
_aApplycw1	extern(C)		rt/aApply.d
_aApplycw2	extern(C)		rt/aApply.d
_aApplydc1	extern(C)		rt/aApply.d
_aApplydc2	extern(C)		rt/aApply.d
_aApplydw1	extern(C)		rt/aApply.d
_aApplydw2	extern(C)		rt/aApply.d
_aApplywc1	extern(C)		rt/aApply.d
_aApplywc2	extern(C)		rt/aApply.d
_aApplywd1	extern(C)		rt/aApply.d
_aApplywd2	extern(C)		rt/aApply.d

utf decoding for foreach_reverse loops

_aApplyRcd1	extern(C)		rt/aApplyR.d
_aApplyRcd2	extern(C)		rt/aApplyR.d
_aApplyRcw1	extern(C)		rt/aApplyR.d
_aApplyRcw2	extern(C)		rt/aApplyR.d
_aApplyRdc1	extern(C)		rt/aApplyR.d
_aApplyRdc2	extern(C)		rt/aApplyR.d
_aApplyRdw1	extern(C)		rt/aApplyR.d
_aApplyRdw2	extern(C)		rt/aApplyR.d
_aApplyRwc1	extern(C)		rt/aApplyR.d
_aApplyRwc2	extern(C)		rt/aApplyR.d
_aApplyRwd1	extern(C)		rt/aApplyR.d
_aApplyRwd2	extern(C)		rt/aApplyR.d

List of runtime hooks starting with _d_array

mangled name	calling convention	description	druntime definition	comment
_d_array_bounds	extern(C)		rt/dmain2.d
_d_arrayappendT	extern(C)		rt/lifetime.d
_d_arrayappendcT	extern(C)		rt/lifetime.d
_d_arrayappendcTX	extern(C)		rt/lifetime.d
_d_arrayappendcd	extern(C)		rt/lifetime.d
_d_arrayappendwd	extern(C)		rt/lifetime.d
_d_arrayassign	extern(C)		rt/arrayassign.d
_d_arraycast	extern(C)		rt/arraycast.d
_d_arraycast_frombit	extern(C)		rt/arraycast.d
_d_arraycatT	extern(C)		rt/lifetime.d
_d_arraycatnT	extern(C)		rt/lifetime.d
_d_arraycopy	extern(C)		rt/arraycat.d
_d_arrayctor	extern(C)		rt/arrayassign.d
_d_arrayliteralT	extern(C)		rt/lifetime.d
_d_arrayliteralTX	extern(C)		rt/lifetime.d
_d_arraysetassign	extern(C)		rt/arrayassign.d
_d_arraysetctor	extern(C)		rt/arrayassign.d
_d_arraysetlengthT	extern(C)		rt/lifetime.d
_d_arraysetlengthiT	extern(C)		rt/lifetime.d

List of unsorted runtime hooks

mangled name	calling convention	description	druntime definition	comment
D9invariant12_d_invariantFC6ObjectZv	extern(D)		rt/invariant.d
_D9invariant12_d_invariantFC6ObjectZv				???
_d_allocmemory	extern(C)		rt/lifetime.d
_d_assert	extern(C)		rt/dmain2.d
_d_assert_msg	extern(C)		rt/dmain2.d
_d_assertm	extern(C)		rt/dmain2.d
_d_callfinalizer	extern(C)		rt/lifetime.d
_d_callinterfacefinalizer	extern(C)		rt/lifetime.d
_d_cover_register	extern(C)		rt/cover.d
_d_criticalenter	extern(C)		rt/critical_.d
_d_criticalexit	extern(C)		rt/critical_.d
_d_delarray	extern(C)		rt/lifetime.d
_d_delarray_t	extern(C)		rt/lifetime.d
_d_delclass	extern(C)		rt/lifetime.d
_d_delinterface	extern(C)		rt/lifetime.d
_d_delmemory	extern(C)		rt/lifetime.d
_d_dynamic_cast	extern(C)		rt/cast_.d
_d_hidden_func	extern(C)		rt/dmain2.d
_d_interface_cast	extern(C)		rt/cast_.d
_d_interface_vtbl	extern(C)		rt/cast_.d
_d_monitor_epilog	extern(C)		rt/deh.d
_d_monitor_handler	extern(C)		rt/deh.d
_d_monitor_prolog	extern(C)		rt/deh.d
_d_monitorenter	extern(C)		rt/deh.d
_d_monitorexit	extern(C)		rt/deh.d
_d_newarrayT	extern(C)		rt/lifetime.d
_d_newarrayiT	extern(C)		rt/lifetime.d
_d_newarraymT	extern(C)		rt/lifetime.d
_d_newarraymTX	???		???
_d_newarraymiT	extern(C)		rt/lifetime.d
_d_newarraymiTX	???		???
_d_newclass	extern(C)		rt/lifetime.d
_d_newitemT	extern(C)		rt/lifetime.d
_d_newitemiT	extern(C)		rt/lifetime.d
_d_obj_cmp	extern(C)		rt/obj.d
_d_obj_eq	extern(C)		rt/obj.d
_d_switch_dstring	extern(C)		rt/switch_.d
_d_switch_error	extern(C)		rt/dmain2.d
_d_switch_string	extern(C)		rt/switch_.d
_d_switch_ustring	extern(C)		rt/switch_.d