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HARSFEN0602
function table is given as an argument
GET_COMM Call to function service of a ‘get’ command whose index in the
function table is given as an argument
SYSSUBJ Call to system function whose index in function table is given as
an argument
USRSUBJ Call to user subroutine whose index in the symbol function table is
given as an argument (push relevant function data to stack)
USRSUBRT Return from user subroutine – restore stack to its state before function
call, save output arguments in stack and jump to return address
FORITR Handle FOR loop – check condition, if true iterate and execute loop
body. Otherwise, break loop and continue program
EOL Indicate this is end of line
FREEVAC Stop program execution
LINK Increase stack pointer with the value given as an argument and zeroes
the new entries to stack
JMP_LABEL Unconditional jump to the label (entry point)
Table 7-1 – Harmonica op codes
7.7 Alphabetic reference
This section details the Harmonica virtual assembly commands.
7.7.1 ADD - ADDITION
Purpose:
Addition of two numbers (top two entries at the stack) .
Algorithm:
(SP-1) + (SP)
(SP-1)
SP
SP-1
Attributes
Attribute Value Comment
Op code May change in future
versions
Number of arguments None
Argument types N.A. Both arguments types are set
according to stack members
flags
Addressing modes Absent
Promotion Int + Float
Executes as
(float) Int + Float
Output type Int + int int
Int + Float
Float
Float + Float
Float
Imposes end of line No
7.7.2 AND – Bitwise AND Operator
Purpose:
Bitwise AND operator – top two entries at the stack.
Algorithm:
(SP-1) & (SP)
(SP-1)
SP
SP - 1