heap module with smaller pointers.

read and write functions do not check whether the pointer
belongs to the heap passed as argument.


git-svn-id: https://svn.cs.ru.nl/repos/clean-compiler/trunk@921 1f8540f1-abd5-4d5b-9d24-4c5ce8603e2d

1 files changed, 125 insertions, 0 deletions

diff --git a/frontend/unsafe_heap.icl b/frontend/unsafe_heap.icl
new file mode 100644
index 0000000..1e90fe7
--- /dev/null
+++ b/frontend/unsafe_heap.icl
@@ -0,0 +1,125 @@
+implementation module unsafe_heap;
+
+import StdOverloaded,StdMisc;
+
+:: Heap v = {heap::!.(HeapN v)};
+:: HeapN v = Heap !Int;
+:: Ptr v = {pointer::!.(PtrN v)};
+:: PtrN v = Ptr !v;
+
+newHeap :: .Heap v;
+newHeap = {heap=Heap 0};
+
+newPtr :: !v !*(Heap v) -> (!.Ptr v,!.Heap v);
+newPtr v h = code {
+	build_r e_unsafe_heap_kPtr 1 0 0 0
+	update_a 0 1
+	pop_a 1
+};
+
+nilPtr :: Ptr v;
+nilPtr =: make_nilPtr;
+
+make_nilPtr :: Ptr v;
+make_nilPtr = code {
+	build _Nil 0 _hnf
+	build_r e_unsafe_heap_kPtr 1 0 0 0
+	update_a 0 1
+	pop_a 1
+};
+
+isNilPtr :: !(Ptr v) -> Bool;
+isNilPtr p = code {
+	repl_args 1 1
+	eq_desc _Nil 0 0
+	pop_a 1
+};
+
+allocPtr :: Ptr v;
+allocPtr = code {
+	build _Cons 0 _hnf
+	build_r e_unsafe_heap_kPtr 1 0 0 0
+	update_a 0 1
+	pop_a 1
+};
+
+initPtr :: !(Ptr v) !v !*(Heap v) !*World -> (!.Heap v,!*World);
+initPtr p v h w
+ = code {
+	push_args 0 1 1
+	eq_desc _Cons 0 0
+	pop_a 1
+	jmp_false init_pointer_error
+	push_a 2
+	fill1_r e_unsafe_heap_kPtr 1 0 1 01
+.keep 0 2
+	pop_a 2
+.d 2 0
+	rtn
+:init_pointer_error
+	pop_a 3
+	print "initPtr: Pointer already initialized"
+	halt
+};
+
+readPtr :: !(Ptr v) !u:(Heap v) -> (!v,!u:Heap v);
+readPtr p h = code {
+	repl_r_args_a 1 0 1 1
+ };
+
+sreadPtr :: !(Ptr v) !(Heap v) -> v;
+sreadPtr p h = code {
+	repl_r_args_a 1 0 1 1
+	update_a 0 1
+	pop_a 1
+};
+
+writePtr :: !(Ptr v) !v !*(Heap v) -> .Heap v;
+writePtr p v h
+ = code {
+	push_a 1
+	fill1_r e_unsafe_heap_kPtr 1 0 1 01
+.keep 0 2
+	pop_a 2 
+};
+
+(<:=) infixl;
+(<:=) heap ptr_and_val :== writePtr ptr val heap ;
+{
+	(ptr, val) = ptr_and_val;
+}
+
+ptrToInt :: !(Ptr v) -> Int;
+ptrToInt p
+	| isNilPtr p
+		= 0;
+		= ptrToInt2 p;
+
+ptrToInt2 :: !(Ptr v) -> Int;
+ptrToInt2 p = code {
+	push_a_b 0
+	pop_a 1
+	build _Nil 0 _hnf
+	push_a_b 0
+	pop_a 1
+	push_b 1
+	eqI
+	jmp_false not_nil
+	pop_b 1
+	pushI 0
+.d 0 1 b
+	rtn
+:not_nil
+.d 0 1 b
+	rtn	
+};
+
+instance == (Ptr a)
+where
+{	(==) p1 p2 = code {
+	push_a_b 1
+	push_a_b 0
+	pop_a 2
+	eqI
+	}
+};