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Generating first (in at least wasm3) runnable code! Added type, function, export, and code sections, with instructions and whatnot!

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This commit is contained in:
Nathan Braswell
2021-04-20 01:36:38 -04:00
parent e1fd8abd4f
commit f254f11f8d
3 changed files with 99 additions and 6 deletions
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101
wasm.kp
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@@ -7,6 +7,7 @@
true (cons (| (& x 0x7F) 0x1) (recurse (>> x 8))))
)
encode_s8_LEB128 (lambda (x) (encode_u_LEB128 (& x 255)))
encode_s32_LEB128 (lambda (x) (encode_u_LEB128 (& x 255)))
encode_vector (lambda (enc v)
(concat (encode_u_LEB128 (len v)) (flat_map enc v) )
)
@@ -22,24 +23,116 @@
(= 2 (len x)) (concat [0x01] (encode_u_LEB128 (idx x 0)) (encode_u_LEB128 (idx x 1)))
true (error "trying to encode bad limits"))
)
encode_number_type (lambda (x)
(cond (= x 'i32) [0x7F]
(= x 'i64) [0x7E]
(= x 'f32) [0x7D]
(= x 'f64) [0x7C]
true (error "bad number type"))
)
encode_valtype (lambda (x)
; we don't handle reference types yet
(encode_number_type x)
)
encode_result_type (lambda (x)
(encode_vector encode_valtype x)
)
encode_function_type (lambda (x)
(concat [0x60] (encode_result_type (idx x 0))
(encode_result_type (idx x 1)))
)
; Instructions
; TODO
; Modules
encode_type_section (lambda (x)
(let (
encoded (encode_vector encode_function_type x)
) (concat [0x01] (encode_u_LEB128 (len encoded)) encoded ))
)
encode_memory_section (lambda (x)
(let (
encoded (encode_vector encode_limits x)
) (concat [0x05] (encode_u_LEB128 (len encoded)) encoded ))
)
encode_export (lambda (export)
(let (
(name type idx) export
) (concat (encode_name name)
(cond (= type 'func) [0x00]
(= type 'table) [0x01]
(= type 'mem) [0x02]
(= type 'global) [0x03]
true (error "bad export type"))
(encode_u_LEB128 idx)
))
)
encode_export_section (lambda (x)
(let (
encoded (encode_vector encode_export x)
) (concat [0x07] (encode_u_LEB128 (len encoded)) encoded ))
)
encode_function_section (lambda (x)
(let (
encoded (encode_vector encode_u_LEB128 x)
) (concat [0x03] (encode_u_LEB128 (len encoded)) encoded ))
)
encode_ins (lambda (ins)
(let (
op (idx ins 0)
) (cond (= op 'unreachable) [0x00]
(= op 'nop) [0x01]
; skipping a bunch
; Parametric Instructions
(= op 'drop) [0x1A]
; skip
; Variable Instructions
(= op 'local.get) (concat [0x20] (encode_u_LEB128 (idx ins 1)))
(= op 'local.set) (concat [0x21] (encode_u_LEB128 (idx ins 1)))
(= op 'local.tee) (concat [0x22] (encode_u_LEB128 (idx ins 1)))
(= op 'global.get) (concat [0x23] (encode_u_LEB128 (idx ins 1)))
(= op 'global.set) (concat [0x24] (encode_u_LEB128 (idx ins 1)))
; skip
; Numeric Instructions
(= op 'i32.const) (concat [0x41] (encode_s32_LEB128 (idx ins 1)))
; skip
(= op 'i32.add) [0x6A]
))
)
encode_code (lambda (x)
(let (
(locals body) x
enc_locals (encode_vector (lambda (loc)
(concat (encode_u_LEB128 (idx loc 0)) (encode_u_LEB128 (idx loc 1)))) locals)
enc_expr (concat (flat_map encode_ins body) [0x0B])
code_bytes (concat enc_locals enc_expr)
) (concat (encode_u_LEB128 (len code_bytes)) code_bytes))
)
encode_code_section (lambda (x)
(let (
encoded (encode_vector encode_code x)
) (concat [0x0A] (encode_u_LEB128 (len encoded)) encoded ))
)
wasm_to_binary (lambda (wasm_code)
(let (
magic [ 0x00 0x61 0x73 0x6D ]
version [ 0x01 0x00 0x00 0x00 ]
memory (encode_memory_section [ [0x20 0x30] ])
) (concat magic version memory))
magic [ 0x00 0x61 0x73 0x6D ]
version [ 0x01 0x00 0x00 0x00 ]
type (encode_type_section [ [['i32] ['i32]] ])
function (encode_function_section [ 0 ])
memory (encode_memory_section [ [0x20 0x30] ])
export (encode_export_section [ ["add" 'func 0] ])
code (encode_code_section [
[ [] [
['i32.const 1337]
['local.get 0]
['i32.add]
] ]
])
) (concat magic version type function memory export code))
)
)
(provide wasm_to_binary)