view lab4/test/funny.p @ 1:b5139af1a420 tip basis

Fixed permissions on compile scripts
author Mike Spivey <mike@cs.ox.ac.uk>
date Fri, 13 Oct 2017 17:27:58 +0100
parents bfdcc3820b32
children
line wrap: on
line source
(* Alias analysis and VAR parameters *)

var a,b,c,d: integer;

proc p1(var a: integer; b: integer; var d: integer): integer;
  var c: integer;
begin
  c :=b+a;
  d :=b+1;
  a :=a-b;
  return (a+d)*b
end;

begin
  a:=5; b:=2; c:=3; d:=1;
  b := p1(b,d,a) + 1;
  print_string("A="); print_num(a);
  print_string(" B="); print_num(b);
  print_string(" C="); print_num(c);
  print_string(" D="); print_num(d);
  newline()
end.

(*<<
A=2 B=4 C=3 D=1
>>*)

(*[[
@ picoPascal compiler output
	.include "fixup.s"
	.global pmain

@ proc p1(var a: integer; b: integer; var d: integer): integer;
	.text
_p1:
	mov ip, sp
	stmfd sp!, {r0-r3}
	stmfd sp!, {r4-r10, fp, ip, lr}
	mov fp, sp
@   c :=b+a;
	ldr r5, [fp, #44]
	ldr r0, [fp, #40]
	ldr r0, [r0]
	add r4, r5, r0
@   d :=b+1;
	add r0, r5, #1
	ldr r1, [fp, #48]
	str r0, [r1]
@   a :=a-b;
	ldr r5, [fp, #40]
	ldr r0, [r5]
	ldr r1, [fp, #44]
	sub r0, r0, r1
	str r0, [r5]
@   return (a+d)*b
	ldr r0, [fp, #40]
	ldr r0, [r0]
	ldr r1, [fp, #48]
	ldr r1, [r1]
	add r0, r0, r1
	ldr r1, [fp, #44]
	mul r0, r0, r1
	ldmfd fp, {r4-r10, fp, sp, pc}
	.ltorg

pmain:
	mov ip, sp
	stmfd sp!, {r4-r10, fp, ip, lr}
	mov fp, sp
@   a:=5; b:=2; c:=3; d:=1;
	set r4, _a
	mov r0, #5
	str r0, [r4]
	set r5, _b
	mov r0, #2
	str r0, [r5]
	mov r0, #3
	set r1, _c
	str r0, [r1]
	mov r6, #1
	set r0, _d
	str r6, [r0]
@   b := p1(b,d,a) + 1;
	mov r2, r4
	mov r1, r6
	mov r0, r5
	bl _p1
	add r0, r0, #1
	set r1, _b
	str r0, [r1]
@   print_string("A="); print_num(a);
	mov r1, #2
	set r0, g1
	bl print_string
	set r0, _a
	ldr r0, [r0]
	bl print_num
@   print_string(" B="); print_num(b);
	mov r1, #3
	set r0, g2
	bl print_string
	set r0, _b
	ldr r0, [r0]
	bl print_num
@   print_string(" C="); print_num(c);
	mov r1, #3
	set r0, g3
	bl print_string
	set r0, _c
	ldr r0, [r0]
	bl print_num
@   print_string(" D="); print_num(d);
	mov r1, #3
	set r0, g4
	bl print_string
	set r0, _d
	ldr r0, [r0]
	bl print_num
@   newline()
	bl newline
	ldmfd fp, {r4-r10, fp, sp, pc}
	.ltorg

	.comm _a, 4, 4
	.comm _b, 4, 4
	.comm _c, 4, 4
	.comm _d, 4, 4
	.data
g1:
	.byte 65, 61
	.byte 0
g2:
	.byte 32, 66, 61
	.byte 0
g3:
	.byte 32, 67, 61
	.byte 0
g4:
	.byte 32, 68, 61
	.byte 0
@ End
]]*)