This is an archive of the discontinued LLVM Phabricator instance.

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	compiled as if all calls to them were through the implicit interface.			compiled as if all calls to them were through the implicit interface.
	This note will mention special handling for procedures that are exposed			This note will mention special handling for procedures that are exposed
	to the possibility of being called with an implicit interface as F77ish procedures			to the possibility of being called with an implicit interface as F77ish procedures
	below; this is of course not standard terminology.			below; this is of course not standard terminology.

	Internal and module subprograms that are ever passed as arguments &/or			Internal and module subprograms that are ever passed as arguments &/or
	assigned as targets of procedure pointers may be F77ish.			assigned as targets of procedure pointers may be F77ish.

	Every F77ish procedure can and must be distiguished at compilation time.			Every F77ish procedure can and must be distinguished at compilation time.
	Such procedures should respect the external naming conventions (when external)			Such procedures should respect the external naming conventions (when external)
	and any legacy ABI used for Fortran '77 programs on the target architecture,			and any legacy ABI used for Fortran '77 programs on the target architecture,
	so that portable libraries can be compiled			so that portable libraries can be compiled
	and used by distinct implementations (and their versions)			and used by distinct implementations (and their versions)
	of Fortran.			of Fortran.

	Note that F77ish functions still have known result types, possibly by means			Note that F77ish functions still have known result types, possibly by means
	of implicit typing of their names.			of implicit typing of their names.
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	with descriptors,			with descriptors,
	and any internal procedures passed to them as arguments must be			and any internal procedures passed to them as arguments must be
	simple addresses of non-internal subprograms or trampolines for			simple addresses of non-internal subprograms or trampolines for
	internal procedures.			internal procedures.

	Note that the `INTENT` attribute does not, by itself,			Note that the `INTENT` attribute does not, by itself,
	require the use of explicit interface; neither does the use of a dummy			require the use of explicit interface; neither does the use of a dummy
	procedure (implicit or explicit in their interfaces).			procedure (implicit or explicit in their interfaces).
	So the analyis of calls to F77ish procedures must allow for the			So the analysis of calls to F77ish procedures must allow for the
	invisible use of `INTENT(OUT)`.			invisible use of `INTENT(OUT)`.

	## Protocol overview			## Protocol overview

	Here is a summary script of all of the actions that may need to be taken			Here is a summary script of all of the actions that may need to be taken
	by the calling procedure and its referenced procedure to effect			by the calling procedure and its referenced procedure to effect
	the call, entry, exit, and return steps of the procedure reference			the call, entry, exit, and return steps of the procedure reference
	protocol.			protocol.
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	information used by the runtime support library for initialization,			information used by the runtime support library for initialization,
	copying, finalization, and I/O of type instances). Each overridable			copying, finalization, and I/O of type instances). Each overridable
	type-bound procedure in the type corresponds to an index into this table.			type-bound procedure in the type corresponds to an index into this table.

	### Host instance linkage			### Host instance linkage

	Calls to dummy procedures and procedure pointers that resolve to			Calls to dummy procedures and procedure pointers that resolve to
	internal procedures need to pass an additional "host instance" argument that			internal procedures need to pass an additional "host instance" argument that
	addresses a block of storage in the stack frame of the their			addresses a block of storage in the stack frame of their
	host subprogram that was active at the time they were passed as an			host subprogram that was active at the time they were passed as an
	effective argument or associated with a procedure pointer.			effective argument or associated with a procedure pointer.
	This is similar to a static link in implementations of programming			This is similar to a static link in implementations of programming
	languages with nested subprograms, although Fortran only allows			languages with nested subprograms, although Fortran only allows
	one level of nesting.			one level of nesting.
	The 64-bit x86 and little-endian OpenPower ABIs reserve registers			The 64-bit x86 and little-endian OpenPower ABIs reserve registers
	for this purpose (`%r10` & `R11`); 64-bit ARM has a reserved register			for this purpose (`%r10` & `R11`); 64-bit ARM has a reserved register
	that can be used (`x18`).			that can be used (`x18`).
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