What is single pass macro processor?

One-Pass Macro Processor • A one-pass macro processor that alternate between macro definition and macro expansion is able to handle “macro in macro”. • However, because of the one-pass structure, the definition of a macro must appear in the source program before any statements that invoke that macro.

What is the task of pass 1 of a macro processor pass?

Algorithm for pass 1 of macro processor :- 2) Scanning of all macro definitions one by one . If MACRO found in program then for each macro perform: 3) MNTC = MNTC + 1 and enter name of MACRO in MNTC ( Macro Name Table ). 5) Generate argument list array.

What are the tasks performed by macro processor?

A macro processor is a program that copies a stream of text from one place to another, making a systematic set of replacements as it does so. Macro processors are often embedded in other programs, such as assemblers and compilers.

How does a one pass macro processor handle macro definitions and macro invocations?

The DEFINE procedure maintains a counter named LEVEL. Each time a MACRO directive is read, the value of LEVEL is increased by 1. Each time an MEND directive is read, the value of LEVEL is decreased by 1. When LEVEL reaches 0, the MEND that corresponds to the original MACRO directive has been found.

What is MNT and MDT?

 Macro-Definition Table (MDT), to store the body of macro defns.  Macro-Definition Table Counter (MDTC), to mark next available entry MDT.  Macro- Name Table (MNT), used to store names of macros.  Macro Name Table counter (MNTC), used to indicate the next available entry in MNT.

What is macro explain with example?

Macro is defined as something that covers a large amount, or is large in size. An example of macro is the study of the key driving aspects of an economy; macro economics. An example of macro is a very close up photograph of an ant; a macro photograph. adjective.

What is MNT and MDT in pass 1 of macro processor?

 MNT, created by Pass1.  Macro-Definition Table Pointer (MDTP), used to indicate the next line of text to be used during macro-expansion.  Argument List Array (ALA), used to substitute macro-call arguments for the index markers in the stored macro-defns.

What are the tasks to be carried out by pass I of two pass hypothetical assembler?

Pass I

Separate the symbol, mnemonic opcode and operand fields.
Determine the storage-required foe every assembly language statement and update the location counter.
Build the symbol table and the literal table.
Construct the intermediate code for every assembly language statement.

What is MDT and MNT in system programming?

What is 2 pass macro processor?

Pass 2 (Replacing MACRO calls by its definition) The macro expander prepares the ALA consisting of a table of dummy argument indices and corresponding arguments to the call. The value from the argument list is substituted for dummy arguments indices in the macro definition table.

What is a two pass macro processor?

What are DC and DS statements?

The two primary data definition statements are the DS directive and the DC directive. The DS directive allocates space for a label; the DC allocates space and assigns an initial value. These declaratives are statements that assign storage locations.