Essential-of-Compilation/notes.md

Revising the architecture to better match Dybvig's P523 compiler

• to do: figure out where to introduce the Tail context. It seems to happen in Dybvig's A10, but that assignment doesn't say anything about it.

• to do: insert type checking

R1:

exp ::= x | n | (op exp*) | (let ([x exp]) exp)
R1 ::= (program exp)

remove-complex-opera* | V

arg ::= x | n
exp ::= arg | (op arg*) | (let ([x exp]) exp)
R2 ::= (program exp)

create-CFG (the graph is empty for this assignment) | V

arg ::= x | n
exp ::= arg | (op arg*)
stmt ::= (assign x exp)
tail ::= (return exp) | (stmt . tail)
CFG ::= (program tail)

uncover-locals | V

arg ::= x | n
exp ::= arg | (op arg*)
stmt ::= (assign x exp)
tail ::= (return exp) | (stmt . tail)
CFG ::= (program (x ...) tail)

select-instructions | V

imm ::= (var x) | (deref r n) | (int n)
instr ::= (addq imm imm) | ...
x86-CFG ::= (program (x ...) instr ...)

assign-homes | V

imm ::= (reg r) | (deref r n) | (int n)
instr ::= (addq imm imm) | ...
x86 ::= (program stack-size instr ...)

patch-instructions | V

same grammar as above

print-x86 | V

---

R2:

exp ::= x | n | #t | #f | (op exp*) | (let ([x exp]) exp) | (if exp exp exp)
R2 ::= (program exp)

type-check | V

exp ::= x | n | #t | #f | (op exp*) | (let ([x exp]) exp) | (if exp exp exp)
R2 ::= (program (type type) exp)

remove-complex-opera* | V

arg ::= x | n | #t | #f
exp ::= arg | (op arg*) | (let ([x exp]) exp) | (if exp exp exp)
R2 ::= (program (type type) exp)

create-CFG | V

arg ::= x | n | #t | #f
exp ::= arg | (op arg*)
tail ::= (jump label) | (if (rel-op exp*) label label) | (return exp)
         | (stmt . tail)
stmt ::= (assign x exp)
CFG ::= (program (type type) ([label . tail] ...) tail)

optimize-jumps | V

same grammar as above

uncover-locals | V

arg ::= x | n | #t | #f
exp ::= arg | (op arg*)
tail ::= (jump label) | (if (rel-op exp*) label label) | (return exp)
      | (stmt . tail)
stmt ::= (assign x exp)
CFG ::= (program (x*) (type type) ([label . tail] ...) tail)

select-instructions | V

tail ::= (jmp label) | (jmp-if cc label label) | (retq) | (instr . tail)
imm ::= (var x) | (deref r n) | (int n)
instr ::= (addq imm imm) | ...
x86-CFG ::= (program (x ...) (type type) ([label . tail] ...) tail)

uncover-live, build-interference, allocate-registers | V

tail ::= (jmp label) | (jmp-if cc label label) | (retq) | (instr . tail)
imm ::= (reg r) | (deref r n) | (int n)
instr ::= (addq imm imm) | ...
x86-CFG ::= (program (x ...) (type type) ([label . tail] ...) tail)

print-x86 | V