diff lab4/test/baz.p @ 0:bfdcc3820b32

Basis
author Mike Spivey <mike@cs.ox.ac.uk>
date Thu, 05 Oct 2017 08:04:15 +0100
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lab4/test/baz.p	Thu Oct 05 08:04:15 2017 +0100
@@ -0,0 +1,61 @@
+(* Assigning to a global variable from a procedure *)
+
+var x: integer;
+
+proc baz(u: integer): integer;
+begin
+  x := u;
+  return x
+end;
+  
+begin
+  print_num(baz(37)); newline();
+  print_num(x); newline()
+end.
+
+(*<<
+37
+37
+>>*)
+
+(*[[
+@ picoPascal compiler output
+	.include "fixup.s"
+	.global pmain
+
+@ proc baz(u: integer): integer;
+	.text
+_baz:
+	mov ip, sp
+	stmfd sp!, {r0-r1}
+	stmfd sp!, {r4-r10, fp, ip, lr}
+	mov fp, sp
+@   x := u;
+	ldr r4, [fp, #40]
+	set r0, _x
+	str r4, [r0]
+@   return x
+	mov r0, r4
+	ldmfd fp, {r4-r10, fp, sp, pc}
+	.ltorg
+
+pmain:
+	mov ip, sp
+	stmfd sp!, {r4-r10, fp, ip, lr}
+	mov fp, sp
+@   print_num(baz(37)); newline();
+	mov r0, #37
+	bl _baz
+	bl print_num
+	bl newline
+@   print_num(x); newline()
+	set r0, _x
+	ldr r0, [r0]
+	bl print_num
+	bl newline
+	ldmfd fp, {r4-r10, fp, sp, pc}
+	.ltorg
+
+	.comm _x, 4, 4
+@ End
+]]*)