Q4) Suppose that you have a one-pass macro processor built into Pass 1 of a two-pass assembler. This macro processor implements nested definitions and nested invocations. Consider the following program(not SIC/XE machine) ALPHA MACRO &ALON, &BRUN SR &ALON, &BRUN GAMMA MACRO &XILT, &Y L VARM, &Y L GREL, &ALON AR &XILT, &Y MEND MEND BETA MACRO &R, &TANGO CR &R, &TANGO SHANE &R, &TANGO MEND SHANE MACRO &C, &D ALPHA &C, &D MEND NOPR 0 BETA 7,8 END (a) Show the macro name table (NAMTAB) and macro definition table (DEFTAB) as they appear when the line with the NOPR instruction is processed. (b) In expanding the invocation of BETA, the macro processor will eventually have to look at the line in the macro definition table that contains the AR instruction. Show NAMTAB and DEFTAB as they would appear at that instant. (c) Show that portion of the expansion of BETA 7,8 which Pass 2 of the assembler must consider in order to generate object code. (d) Suppose that the line "SHANE &R, &TANGO" in the definition of BETA were replaced by "BETA &R, &TANGO". This will cause a terrible thing to happen. Where will the bad thing happen? (Pass 1 of the assembler? Pass 2 of the program?) What would we see (error message or symptom) that would indicate that something had gone wrong?
Q4) Suppose that you have a one-pass macro processor built into Pass 1 of a two-pass assembler. This macro processor implements nested definitions and nested invocations. Consider the following program(not SIC/XE machine) ALPHA MACRO &ALON, &BRUN SR &ALON, &BRUN GAMMA MACRO &XILT, &Y L VARM, &Y L GREL, &ALON AR &XILT, &Y MEND MEND BETA MACRO &R, &TANGO CR &R, &TANGO SHANE &R, &TANGO MEND SHANE MACRO &C, &D ALPHA &C, &D MEND NOPR 0 BETA 7,8 END (a) Show the macro name table (NAMTAB) and macro definition table (DEFTAB) as they appear when the line with the NOPR instruction is processed. (b) In expanding the invocation of BETA, the macro processor will eventually have to look at the line in the macro definition table that contains the AR instruction. Show NAMTAB and DEFTAB as they would appear at that instant. (c) Show that portion of the expansion of BETA 7,8 which Pass 2 of the assembler must consider in order to generate object code. (d) Suppose that the line "SHANE &R, &TANGO" in the definition of BETA were replaced by "BETA &R, &TANGO". This will cause a terrible thing to happen. Where will the bad thing happen? (Pass 1 of the assembler? Pass 2 of the program?) What would we see (error message or symptom) that would indicate that something had gone wrong?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:Q4) Suppose that you have a one-pass macro processor built into Pass 1 of a two-pass
assembler. This macro processor implements nested definitions and nested
invocations. Consider the following program(not SIC/XE machine)
ALPHA
MACRO
&ALON, &BRUN
SR
&ALON, &BRUN
GAMMA
MACRO
&XILT, &Y
L
VARM, &Y
L
GREL, &ALON
AR
&XILT, &Y
MEND
MEND
BETA
MACRO
&R, &TANGO
CR
&R, &TANGO
SHANE
&R, &TANGO
MEND
SHANE
MACRO
&C, &D
ALPHA
&C, &D
MEND
NOPR
0
BETA
7,8
END
(a) Show the macro name table (NAMTAB) and macro definition table (DEFTAB) as
they appear when the line with the NOPR instruction is processed.
(b) In expanding the invocation of BETA, the macro processor will eventually have to
look at the line in the macro definition table that contains the AR instruction. Show
NAMTAB and DEFTAB as they would appear at that instant.
(c) Show that portion of the expansion of BETA 7,8 which Pass 2 of the assembler must
consider in order to generate object code.
(d) Suppose that the line "SHANE &R, &TANGO" in the definition of BETA were
replaced by "BETA &R, &TANGO". This will cause a terrible thing to happen.
Where will the bad thing happen? (Pass 1 of the assembler? Pass 2 of the program?)
What would we see (error message or symptom) that would indicate that something
had gone wrong?
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