Pass 2 algorithm for RISC assembler:
begin
initialize opcode table
open intermediate file and symbol table file
load symbol table from file and close symbol table file
open output object file and output listing file
write object file header
read input line from intermediate file
do
if (line != ".EXTERN") && (line != ".CODE") && (line != ".END")
echo line to listing file
read input line from intermediate file
elseif (line == ".EXTERN")
echo .EXTERN line to listing file
read input line from intermediate file
while (line != ".DATA") && (line != ".CODE") && (line != ".END")
echo line to listing file
add subroutine name, library name to external reference list
read input line from intermediate file
endwhile
elseif (line == ".CODE")
echo .CODE line to listing file
read input line from intermediate file
while (line != ".DATA") && (line != ".EXTERN") && (line != ".END")
calculate object code for instruction
echo line to listing file, adding object code
write object code to object file
read input line from intermediate file
endwhile
endif
while (line != ".END")
echo .END line to listing file
close intermediate file
close output listing file
write beginning of object file trailer
while (not at end of external reference list)
write external reference information to object file trailer
endwhile
close output object file
end
