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!COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1972, 1987
!ALL RIGHTS RESERVED.
!
!THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
!ONLY  IN  ACCORDANCE  WITH  THE  TERMS  OF  SUCH LICENSE AND WITH THE
!INCLUSION OF THE ABOVE COPYRIGHT NOTICE.  THIS SOFTWARE OR ANY  OTHER
!COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
!OTHER PERSON.  NO TITLE TO AND OWNERSHIP OF THE  SOFTWARE  IS  HEREBY
!TRANSFERRED.
!
!THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT  NOTICE
!AND  SHOULD  NOT  BE  CONSTRUED  AS A COMMITMENT BY DIGITAL EQUIPMENT
!CORPORATION.
!
!DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY  OF  ITS
!SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.

!AUTHOR: S MURPHY/EGM/TFV

MODULE	PH2S(SREG=#17,VREG=#15,FREG=#16,DREGS=4,RESERVE(0,1,2,3),START,GLOROUTINES) =
BEGIN

SWITCHES NOLIST;
REQUIRE FIRST.BLI;
REQUIRE TABLES.BLI;
SWITCHES LIST;

GLOBAL BIND PH2SV = #11^24 + 0^18 + #2500;	! Version Date: 16-Nov-84

%(

***** Begin Revision History *****

30	-----	-----	DELETE REFERENCE TO NOFRTEMP

***** Begin Version 6 *****

31	1047	EGM	22-Jan-81	Q10-05325
	Add support for TOPS-10 execute only.

***** Begin Version 7 *****

32	1500	SRM	11-Feb-82
	Give CHO message if have bypassed the optimizer because of
	character data in program.

1633	TFV	1-Sep-82
	Count number of executable statements.


***** Begin Version 10 *****

2474	TFV	21-Sep-84
	Fix continuation processing to handle unlimited numbers of blank
	and comment  lines between  continuation lines.   The lines  are
	recorded in  a linked  list  of four  word entries,  defined  in
	LEXAID.BLI.  If there are too many blank and comment lines,  the
	buffer will get an overflow.   When this happens, the buffer  is
	compacted using the information in the linked list.  The info is
	also used  to speed  up continuation  processing in  the  lexeme
	scan.

2500	AlB	14-Nov-84
	Change the list of entries for source lines from a linked list
	in dynamic memory to a fixed-length list in static memory.

	This edit blew away all that was done in edit 2474, leaving not so
	much as a mumble.

***** End V10 Development *****

***** End Revision History *****

)%

%1633%	EXTERNAL STCNT;		! Number of executable statements

	EXTERNAL P2SKL1DISP;

%1500%	EXTERNAL FATLERR,E181;
%1500%	EXTERNAL TURNOFFOPT;	!Flag for /OPT turned off for this subroutine
				! because it had character data

%[1047]% PORTAL ROUTINE MRP2S =
BEGIN


%(****THIS MODULE MAKES A PASS OVER THE SOURCE PROGRAM, PERFORMING PHASE 2 SKEL
	AND COMMON SUBEXPR ELIMINATION FOR ALL STATEMENTS***)%
	EXTERNAL SEGINCORE,PHAZCONTROL;
	EXTERNAL P2SKSTMNT,CSTMNT;
	EXTERNAL LOCELIM;
	EXTERNAL MEMCMCHK;
	EXTERNAL BACKST,CORMAN,LENTRY,DOWDP,CDONODE;
	EXTERNAL MAKASSOC;	!ROUTINE TO SET UP LIST OF ALL ASSOCIATE VARS
				! IN THE PROGRAM

	MAP BASE CSTMNT;

	EXTERNAL INNERLOOP;	!GLOBAL FLAG THAT IS SET WHILE PROCESSING
				! STMNTS IN AN INNER LOOP

%1500%	! If we have bypassed the optimizer because of character data
%1500%	!  in the program, give a warning message
%1500%	IF .TURNOFFOPT
%1500%	THEN
%1500%	FATLERR(-1,E181<0,0>);

	%(***INIT GLOBALS USED BY COMMON SUBEXPR ELIM***)%
	NAME<LEFT>_SRCSIZ+ASGNSIZ;
	BACKST_CORMAN();
	LENTRY_0;

	%(***INIT GLOBAL USED BY THE ROUTINE THAT SUBSTITUTES REGCONTENTS NODES FOR DO
		CONTROL VARIABLE*****)%
	DOWDP_0;

	INNERLOOP_FALSE;	!INIT FLAG FOR "ARE CURRENTLY PROCESSING STMNTS
				! IN AN INNER LOOP"

	NAME<LEFT>_SRCSIZ+DOSIZ;	!MAKE A DUMMY DO STMNT WHICH HAS
					! ALL WDS ZERO
	CDONODE_CORMAN();		!INIT PTR TO "CURRENT INNER DO" TO PT
					! TO THIS DUMMY


	MAKASSOC();	!MAKE A LINKED LIST OF ALL ASSOCIATE VARS IN THE PROGRAM
			! (THIS LIST IS NEEDED BY THE BB REG ALLOCATOR)

	CSTMNT_.SORCPTR<LEFT>;			!GET PTR TO 1ST STMNT OF PROGRAM

	%(***SKIP 1ST STMNT WHICH IS ALWAYS A DUMMY CONTINUE***)%
	IF .CSTMNT NEQ 0
	THEN
	CSTMNT_.CSTMNT[SRCLINK];


	WHILE .CSTMNT NEQ 0
	DO
	BEGIN

%1633%		STCNT = .STCNT + 1;	! Count executable statements

		ISN_.CSTMNT[SRCISN];
		P2SKSTMNT();
		LOCELIM(.CSTMNT);		!PERFORM LOCAL COMMON SUBEXPR ELIM
		MEMCMCHK();			!DETECT OPS THAT CAN BE PERFORMED TO MEMORY
		CSTMNT_.CSTMNT[SRCLINK];
	END;

END;			!END OF MRP2S
MACHOP POPJ=#263;
MRP2S();
POPJ(#17,0)