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Warwick Harvey 9cbccbd5dc This change adds a new extras directory, "references".

Estimated hours taken: 70 (plus whatever pets spent when he wrote the
original version of this)

This change adds a new extras directory, "references".  This directory
contains two impure reference type modules and a module that allows scoped
non-backtrackable update, along with examples of using them and tests.
These modules are intended to be useful when HAL is retargetted to Mercury,
for implementing global variables (backtracking and non-backtracking), and
may also be useful for the debugger.

In order to implement these features, a new memory zone "global heap" was
added to the runtime system, for a heap which is not reclaimed on failure,
along with a pair of functions for copying terms to this heap.

runtime/mercury_deep_copy.c:
runtime/mercury_deep_copy.h:
	Added two functions, MR_make_permanent() and
	MR_make_partially_permanent(), which essentially do a deep copy of a
	term to the global heap.
	(In conservative GC grades, these functions actually do nothing).

runtime/mercury_engine.c:
runtime/mercury_engine.h:
	Added fields global_heap_zone and e_global_hp (for the global heap
	and its heap pointer) to the MR_mercury_engine_struct, along with
	appropriate initialisation, etc.
	Defined MR_heap_zone, MR_solutions_heap_zone, and
	MR_global_heap_zone for convenient access to the corresponding field
	of the relevant Mercury engine.

runtime/mercury_memory.c:
	Added code for handling the size and zone size of the global heap.

runtime/mercury_regorder.h:
runtime/mercury_regs.h:
	Defined MR_global_hp (the global heap pointer for general use),
	along with corresponding other changes.

runtime/mercury_wrapper.c:
runtime/mercury_wrapper.h:
	Added declarations and initialisation of the size and zone_size of
	the global_heap.
	Added an entry for MR_GLOBAL_HP_RN to print_register_usage_counts()
	(plus missing entries for MR_SOL_HP_RN, MR_MIN_HP_REC and
	MR_MIN_SOL_HP_REC).

New files:

extras/references/Mmakefile:
	Mmakefile for building and testing these modules.

extras/references/README:
	Description of contents of this directory.

extras/references/global.m:
	A wrapper module for building a library containing the nb_reference,
	reference and scoped_update modules.

extras/references/nb_reference.m:
	Implements references which are not backtracked on failure.

extras/references/reference.m:
	Implements references which *are* backtracked on failure.

extras/references/scoped_update.m:
	Allows nested scoping of non-backtracking references.

extras/references/samples/Mmakefile:
extras/references/samples/max_of.m:
extras/references/samples/max_test.exp:
extras/references/samples/max_test.m:
	An example of using a non-backtracking reference (to find the
	maximum of the solutions generated by a predicate), with tests.

extras/references/tests/Mmakefile:
extras/references/tests/ref_test.exp:
extras/references/tests/ref_test.m:
	Some tests of references (backtracking and non-backtracking) and
	scoping.

1998-06-18 04:30:48 +00:00

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