MACRO DATABASE

Great to know that you are curious about the databases used in the MACRO Pass1 and Pass2.

Here we Go.!!!!!

Pass 1: Databases

1. Source Program
2. Output of Source Program to be fed to Pass 2
3. Macro Definition Table (MDT)- Stores Macro Definitions
4. Macro Name Table(MNT) - Stores the Macro Name that are defined in the Program
5. Macro Definition Table Counter (MDTC) - Indicates next available entry in MDT
6. Macro Name Table Counter (MNTC) - Indicates next available entry in MNT
7. Argument List Array (ALA)- Stores the index markers for dummy arguments

Pass 2: Databases

1. Input Source Program
2. Expanded Source Code i.e  Output for Assembler 
3. Macro Definition Table (MDT)- Created and Maintained by Pass 1
4. Macro Name Table(MNT) -  Created and Maintained by Pass 1 
5. Macro Definition Table Pointer (MDTP) - Indicate next line used in Expansion.
6. Arguments List Arrays (ALA)- Substitutes arguments for index markers.

Example

                MACRO
&PAC     ADDM    &ARG1,&ARG2,&ARG3 
                A  1, &ARG1 
                A  2, &ARG2     

                A  3, &ARG3
                MEND
..................................................
LOOP     ADDM   D1,D2,D3
..................................................

1.Argument List Array

INDEX	ARGUMENT
0	LOOPbbbb
1	D1bbbbbb
2	D2bbbbbb
3	D3bbbbbb

2. Macro Definition Table

INDEX	CARD
10	&PAC ADDM &ARG1,&ARG2,&ARG3
11	A 1,#1
12	A 2,#2
13	A 3,#3
14	MEND

3. Macro Name Table

INDEX	NAME	MDT INDEX
	8-BYTES	4 BYTES
. . .	. . .	. . .
3	ADDMbbbb	10
. . .	. . .	. . .