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(ns cljcc.emit
(:require
[cljcc.util :refer [get-os]]
[cljcc.compiler :as c]
[clojure.string :as str]
[cljcc.symbols :as symbols]))
(defn- handle-label [identifier]
(condp = (get-os)
:mac (str "L" identifier)
:linux (str ".L" identifier)
(throw (ex-info "Error in generating label." {}))))
(defn- handle-symbol-name [name]
(if (= :mac (get-os))
(str "_" name)
name))
(defn- handle-current-translation-unit [name]
(if (= :mac (get-os))
(handle-symbol-name name)
(if (contains? @symbols/symbols name)
name
(str name "@PLT"))))
;;;; Operand Emit
(defn- imm-opernad-emit [operand _opts]
(format "$%d" (:value operand)))
(defn- stack-operand-emit [operand _opts]
(format "%d(%%rbp)" (:value operand)))
(defn- data-operand-emit [operand _opts]
(format "%s(%%rip)" (handle-symbol-name (:identifier operand))))
(defn- register-operand [{:keys [register] :as operand} {register-width :register-width :or {register-width :4-byte}}]
(let [register->width->output {:ax {:8-byte "%rax"
:4-byte "%eax"
:1-byte "%al"}
:dx {:8-byte "%rdx"
:4-byte "%edx"
:1-byte "%dl"}
:cx {:8-byte "%rcx"
:4-byte "%ecx"
:1-byte "%cl"}
:di {:8-byte "%rdi"
:4-byte "%edi"
:1-byte "%dil"}
:si {:8-byte "%rsi"
:4-byte "%esi"
:1-byte "%sil"}
:r8 {:8-byte "%r8"
:4-byte "%r8d"
:1-byte "%r8b"}
:r9 {:8-byte "%r9"
:4-byte "%r9d"
:1-byte "%r9b"}
:r10 {:8-byte "%r10"
:4-byte "%r10d"
:1-byte "%r10b"}
:r11 {:8-byte "%r11"
:4-byte "%r11d"
:1-byte "%r11b"}
:cl {:4-byte "%cl"
:1-byte "%cl"}}]
(if-let [out (get-in register->width->output [register register-width])]
out
(throw (AssertionError. (str "Invalid register operand register width " operand " " register-width))))))
(def operand-emitters
"Map of assembly operands to operand emitters."
{:imm #'imm-opernad-emit
:reg #'register-operand
:data #'data-operand-emit
:stack #'stack-operand-emit})
(defn- operand-emit
([operand]
(operand-emit operand {}))
([operand opts]
(if-let [[_ operand-emit-fn] (find operand-emitters (:operand operand))]
(operand-emit-fn operand opts)
(throw (AssertionError. (str "Invalid operand: " operand))))))
;;;; Instruction Emit
(defn- mov-instruction-emit [instruction]
(let [src (operand-emit (:src instruction))
dst (operand-emit (:dst instruction))]
[(format " %s %s, %s" "movl" src dst)]))
(defn- cmp-instruction-emit [instruction]
(let [src (operand-emit (:src instruction))
dst (operand-emit (:dst instruction))]
[(format " %s %s, %s" "cmpl" src dst)]))
(defn- jmp-instruction-emit [instruction]
[(format " jmp %s" (handle-label (:identifier instruction)))])
(defn- jmpcc-instruction-emit [instruction]
(let [cc (name (:cond-code instruction))
label (handle-label (:identifier instruction))]
[(format " j%s %s" cc label)]))
(defn- setcc-instruction-emit [instruction]
(let [cc (name (:cond-code instruction))
operand (operand-emit (:operand instruction) {:register-width :1-byte})]
[(format " set%s %s" cc operand)]))
(defn- label-instruction-emit [instruction]
[(format " %s:" (handle-label (:identifier instruction)))])
(defn- ret-instruction-emit [_instruction]
[" movq %rbp, %rsp"
" popq %rbp"
" ret"])
(defn- unary-instruction-emit [instruction]
(let [operand (operand-emit (:operand instruction))
assembly-operator (condp = (:unary-operator instruction)
:bit-not "notl"
:negate "negl"
(throw (AssertionError. (str "Invalid unary operator: " instruction))))]
[(format " %s %s" assembly-operator operand)]))
(defn- binary-instruction-emit [instruction]
(let [src (operand-emit (:src instruction))
dst (operand-emit (:dst instruction))
binop (:binary-operator instruction)
binop-operator (condp = binop
:add "addl"
:sub "subl"
:mul "imull"
:bit-and "andl"
:bit-xor "xorl"
:bit-or "orl"
:bit-left-shift "sall"
:bit-right-shift "sarl"
(throw (AssertionError. (str "Invalid binary operator: " instruction))))]
[(format " %s %s, %s" binop-operator src dst)]))
(defn- cdq-instruction-emit [_instruction]
[" cdq"])
(defn- idiv-instruction-emit [instruction]
[(format " idivl %s" (operand-emit (:operand instruction)))])
(defn- allocate-stack-instruction-emit [instruction]
[(format " subq $%d, %%rsp" (:value instruction))])
(defn- deallocate-stack-instruction-emit [instruction]
[(format " addq $%d, %%rsp" (:value instruction))])
(defn- push-instruction-emit [instruction]
[(format " pushq %s" (operand-emit (:operand instruction) {:register-width :8-byte}))])
(defn- call-instruction-emit [instruction]
[(format " call %s" (handle-current-translation-unit (:identifier instruction)))])
(def instruction-emitters
"Map of assembly instructions to function emitters."
{:mov #'mov-instruction-emit
:ret #'ret-instruction-emit
:binary #'binary-instruction-emit
:cdq #'cdq-instruction-emit
:idiv #'idiv-instruction-emit
:unary #'unary-instruction-emit
:setcc #'setcc-instruction-emit
:jmp #'jmp-instruction-emit
:jmpcc #'jmpcc-instruction-emit
:label #'label-instruction-emit
:cmp #'cmp-instruction-emit
:allocate-stack #'allocate-stack-instruction-emit
:deallocate-stack #'deallocate-stack-instruction-emit
:push #'push-instruction-emit
:call #'call-instruction-emit})
(defn instruction-emit [instruction]
(if-let [[_ instruction-emit-fn] (find instruction-emitters (:op instruction))]
(instruction-emit-fn instruction)
(throw (AssertionError. (str "Invalid instruction: " instruction)))))
(defn function-definition-emit [{:keys [identifier instructions global?]}]
(let [name (handle-symbol-name identifier)
globl (if global?
(format " .globl %s", name)
"")
name-line (format "%s:" name)
instructions (mapv instruction-emit instructions)]
(->> [globl
" .text"
name-line
" pushq %rbp"
" movq %rsp, %rbp"
instructions
"\n"]
flatten
(filterv not-empty))))
(defn- static-variable-definition-emit [{:keys [identifier global? initial-value]}]
(let [name (handle-symbol-name identifier)
globl (if global?
(format " .globl %s" name)
"")
data-or-bss (if (zero? initial-value)
" .bss"
" .data")
size-val (if (zero? initial-value)
" .zero 4"
(format " .long %d" initial-value))]
(filterv not-empty [globl
data-or-bss
" .balign 4"
(format "%s:" name)
size-val
"\n"])))
(def emitters-top-level
"Map of assembly top level constructs to their emitters."
{:function #'function-definition-emit
:static-variable #'static-variable-definition-emit})
(defn emit-top-level [tacky-ast]
(if-let [[_ emit-fn] (find emitters-top-level (:type tacky-ast))]
(emit-fn tacky-ast)
(throw (AssertionError. (str "Invalid ast: " tacky-ast)))))
(def linux-assembly-end ".section .note.GNU-stack,\"\",@progbits")
(defn emit [top-levels]
(let [handle-os (fn [ast]
(if (= :linux (get-os))
(conj (conj (vec ast) linux-assembly-end))
ast))]
(->> top-levels
(mapv emit-top-level)
concat
flatten
handle-os
(str/join "\n"))))
(comment
(emit
(c/generate-assembly
"int main(void) {
return ~(-(~(-1)));
}"))
())
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