CPSC 2310 - DAY 23
OCTOBER 28, 2016

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Syntactic Analysis builds a parse tree

determines meaning

This then will generate intermediate code

They will then optimize the code (machine-independent optimization)

MACRO PROCESSOR
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simple abstraction through textual substitution ("open subroutines")

provides either keyword or positional parameter substitution

extends instruction set by synthesizing instructions using macro definitions

ex:
	square (x+1) will mean x+1*x+1
	have to write parenthesis so it knows what to do.
	They are textual substitution, no interpretation.

expands macro at assembly time, not at runtime

They expand the code in place so there is less overhead

linker combines seperate object files into a single executable
	.layout pieces of code and data (storage allocation based on sizes)
	.resolve external references
	.perform relocation of absolute addresses

loader brings a program into memory in preperation for execution
read file header to find size of pieces
allocate memory areas
read instructions and data from file into memory
relocation (adjusting absolute addresses relative to load point
jump to startup code