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Procedure pointers in stack are not initialized

Posted: Thu Nov 05, 2020 3:01 am
by X512
Test code:

Code: Select all

MODULE A;
	
	PROCEDURE Proc1; BEGIN HALT(0) END Proc1;
	PROCEDURE Proc2; BEGIN HALT(0) END Proc2;
	PROCEDURE Proc3; BEGIN HALT(0) END Proc3;
	
	PROCEDURE Do*;
		VAR p: ARRAY 16 OF PROCEDURE;
	BEGIN
		p[0] := Proc1;
		p[1] := Proc2;
		p[2] := Proc3;
		HALT(0);
	END Do;
	
END A.

A.Do
Trap:

Code: Select all

 A.Do   [0000004BH] 
	.p	ARRAY 16 OF PROCEDURE	
	  [0]	PROCEDURE	A.Proc1
	  [1]	PROCEDURE	A.Proc2
	  [2]	PROCEDURE	A.Proc3
	  [3]	PROCEDURE	0062E294H
	  [4]	PROCEDURE	TextModels.StdModel.NewReader
	  [5]	PROCEDURE	NIL
	  [6]	PROCEDURE	02925690H
	  [7]	PROCEDURE	02925650H
	  [8]	PROCEDURE	0062E2A4H
	  [9]	PROCEDURE	TextSetters.Reader.Read
	  [10]	PROCEDURE	029BDB30H
	  [11]	PROCEDURE	0062E2C4H
	  [12]	PROCEDURE	TextSetters.StdReader.Read
	  [13]	PROCEDURE	029BDB70H
	  [14]	PROCEDURE	029BDB30H
	  [15]	PROCEDURE	00000026H   

Code: Select all

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Re: Procedure pointers in stack are not initialized

Posted: Thu Nov 05, 2020 1:18 pm
by adimetrius
It seems to me that the problem is in DevCPC486.FindPtrs. It has the following line inside a branch checking local arrays:

Code: Select all

	IF (btyp.form = Pointer) OR (btyp.comp = Record) THEN
Seemingly, it has to be changed to include procedural types as follows:

Code: Select all

	IF (btyp.form IN {Pointer, ProcTyp}) OR (btyp.comp = Record) THEN
I've done a few checks after applying this patch, it seems to have worked. Although testing is somewhat tricky, because it depends on the undefined stack bytes. Here's what I've used:

Code: Select all

MODULE X512Bug;

	PROCEDURE P*;
		VAR a: ARRAY 32 OF PROCEDURE;
	BEGIN
		a[0] := P; HALT(0)
	END P;
	
	PROCEDURE PrepStack;
		VAR s: ARRAY 128 OF CHAR;
	BEGIN 
		s := "This is some gibberish to fill the stack before testing procedure initialization"
	END PrepStack;
	
	PROCEDURE Do*;
	BEGIN 
		PrepStack; 
		P
	END Do;

END X512Bug.
Shows garbage values without the proposed fix, shows clean NILs with the fix.

Re: Procedure pointers in stack are not initialized

Posted: Sun Nov 08, 2020 2:50 am
by X512
Proposed fix is confirmed

Code: Select all

 A.Do   [00000057H] 
	.p	ARRAY 16 OF PROCEDURE	
	  [0]	PROCEDURE	A.Proc1
	  [1]	PROCEDURE	A.Proc2
	  [2]	PROCEDURE	A.Proc3
	  [3]	PROCEDURE	NIL
	  [4]	PROCEDURE	NIL
	  [5]	PROCEDURE	NIL
	  [6]	PROCEDURE	NIL
	  [7]	PROCEDURE	NIL
	  [8]	PROCEDURE	NIL
	  [9]	PROCEDURE	NIL
	  [10]	PROCEDURE	NIL
	  [11]	PROCEDURE	NIL
	  [12]	PROCEDURE	NIL
	  [13]	PROCEDURE	NIL
	  [14]	PROCEDURE	NIL
	  [15]	PROCEDURE	NIL 

Code: Select all

PROCEDURE Do;

    VAR p: ARRAY 16 OF PROCEDURE (); -72
F200002E:     PUSH    EBP		55
F200002F:     MOV     EBP,ESP		8BEC
F2000031:     PUSH    EDI		57
F2000032:     PUSH    ESI		56
F2000033:     ADD     ESP,-64		83C4C0
(* array initialization *)
F2000036:     XOR     EAX,EAX		31C0
F2000038:     LEA     EDI,[EBP,-72]		8D7DB8
F200003B:     MOV     ECX,16		B910000000
F2000040:     REPE:STOS 		F3AB

F2000042:     MOV     [EBP,-72],$F2000001		C745B8010000F2	>>>
F2000049:     MOV     [EBP,-68],$F2000010		C745BC100000F2	>>>
F2000050:     MOV     [EBP,-64],$F200001F		C745C01F0000F2	>>>
F2000057:     HALT    0		8DF000	>>>
F200005A:     LEA     ESP,[EBP,-8]		8D65F8	>>>
F200005D:     POP     ESI		5E
F200005E:     POP     EDI		5F
F200005F:     POP     EBP		5D
F2000060:     RET		C3
F2000061:     NOP		90
F2000062:     NOP		90
F2000063:     NOP		90