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module-compiler.scm
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module-compiler.scm
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(define-library (module-compiler)
(export compile-r7rs-library-to-wasm-module)
(import (scheme base)
(lists)
(scheme-syntax)
(scheme-r7rs-syntax)
(scheme-libraries)
(compilation-error)
(lexical-env)
(compiled-program)
(wasm-syntax)
(pattern-match)
(values)
(expression-compiler)
(literals-compiler))
;;;; SCHEME to WAT (WebAssembly Text format) compiler written in R7RS-small
;;;; BASED ON COMPILER FROM SECTION 5.5 OF
;;;; STRUCTURE AND INTERPRETATION OF COMPUTER PROGRAMS
(begin
(define (compile-r7rs-library-to-wasm-module exp)
(check-library exp)
(check-library-declarations exp)
(let* ((initial-program (make-empty-compiled-program))
(library-program (compile-library-to-program exp initial-program)))
(compile-program-to-module library-program)))
(define (compile-library-to-program library program)
(let*
((imports
(library-declarations 'import library))
(import-definitions (import-definitions imports))
(exp-sequence
(if (library-has-declaration? 'begin library)
(library-declarations 'begin library)
(raise-compilation-error "No begin declaration in library" library)))
(definitions-and-non-definitions
(partition-list definition? exp-sequence))
(definitions
(car definitions-and-non-definitions))
(non-definitions
(cdr definitions-and-non-definitions))
(definition-names
(map definition-variable definitions))
(exports
(library-declarations 'export library))
(global-imports
(filter (lambda (import-def) (eq? (import-type import-def) 'global))
import-definitions))
(global-import-bindings
(map import-binding global-imports))
(func-imports
(filter (lambda (import-def) (eq? (import-type import-def) 'func))
import-definitions))
(func-import-bindings
(filter (lambda (b) b) (map import-binding func-imports)))
(import-bindings
(append global-import-bindings func-import-bindings))
(lexical-env
(make-global-lexical-env import-bindings definition-names exports))
(program
(compiled-program-with-definitions-and-value-code
program
(map import-definition import-definitions)
'()))
(bound-import-func-definitions
(let loop ((func-imports func-imports)
(func-index 0)
(definitions '()))
(let ((next
(lambda (definitions)
(loop (cdr func-imports) (+ func-index 1) definitions))))
(cond ((null? func-imports) (reverse definitions))
((import-binding (car func-imports))
=> (lambda (binding)
(let ((definitions
(cons `(elem ,func-index) definitions))
(next
(lambda (definitions)
(loop (cdr func-imports) (+ func-index 1) definitions))))
(if (and (memq binding exports) (not (memq binding definition-names)))
(next (cons `(export ,(symbol->string binding) (func ,func-index)) definitions))
(next definitions)))))
(else (next definitions))))))
(program
(compiled-program-with-definitions-and-value-code
program
bound-import-func-definitions
'()))
(program
(do ((bindings func-import-bindings (cdr bindings))
(elem-index 0 (+ elem-index 1))
(program program (compiled-program-add-definition
program
`(global i32 (i32.const ,(funcidx->procedure-value elem-index))))))
((null? bindings) program)))
(program
(compiled-program-with-definitions-and-value-code
program
(make-list (length definitions)
`(global (mut i32) (i32.const ,uninitialized-value)))
'()))
(definitions-init-assignments
(map (lambda (definition)
`(set! ,(definition-variable definition) ,(definition-value definition)))
definitions))
(non-definitions
(append definitions-init-assignments non-definitions))
(program
(if (null? non-definitions)
program
(let* ((program
(compile-sequence non-definitions program lexical-env compile))
(global-init-code
(compiled-program-value-code program))
(global-init-func-index
(compiled-program-definitions-count program 'func)))
(compiled-program-with-definitions-and-value-code
program
`((func
,@(wasm-local-definitions-to-top global-init-code)
drop)
(start ,global-init-func-index))
'()))))
(elem-defs-count
(compiled-program-definitions-count program 'elem))
(program
(if (= elem-defs-count 0)
program
(compiled-program-add-definition
program
`(table ,elem-defs-count funcref)))))
program))
(define (compile-program-to-module program)
(let*
((elem-defs
(compiled-program-get-definitions program 'elem))
(elem-func-indices
(map wasm-elem-definition-func-index elem-defs))
(elems-def
(if (null? elem-defs)
'()
`((elem (i32.const 0) func ,@elem-func-indices))))
(get-module-definitions
(lambda (type)
(compiled-program-get-definitions program type)))
(not-import-definition?
(lambda (def) (not (wasm-import-definition? def))))
(imported-memories
(filter wasm-import-definition? (get-module-definitions 'memory)))
(imported-globals
(filter wasm-import-definition? (get-module-definitions 'global)))
(module-globals
(filter not-import-definition? (get-module-definitions 'global)))
(imported-funcs
(filter wasm-import-definition? (get-module-definitions 'func)))
(module-funcs
(filter not-import-definition? (get-module-definitions 'func))))
`(module
,@(get-module-definitions 'type)
,@(get-module-definitions 'import)
,@imported-memories
,@imported-globals
,@imported-funcs
,@module-globals
,@module-funcs
,@(get-module-definitions 'table)
,@(get-module-definitions 'export)
,@(get-module-definitions 'start)
,@elems-def
,@(literal-data-definitions program))))
(define (make-global-lexical-env imported-identifiers defined-variables exports)
(let ((duplicate-import (first-duplicate (filter symbol? imported-identifiers))))
(if (not (null? duplicate-import))
(raise-compilation-error "Duplicate imported identifier" (car duplicate-import))))
(let ((duplicate-var (first-duplicate (filter symbol? defined-variables))))
(if (not (null? duplicate-var))
(raise-compilation-error "Top-level identifier already defined" (car duplicate-var))))
(let ((variables (append imported-identifiers defined-variables)))
(for-each
(lambda (export)
(if (not (memq export variables))
(raise-compilation-error "No top-level definition for export" export)))
exports)
(let*
((import-variables
(filter (lambda (imported-identifier) (not (memq imported-identifier defined-variables)))
imported-identifiers))
(additional-info
(map (lambda (import-variable) `(,import-variable import))
import-variables))
(additional-info
(fold
(lambda (var info)
(if (memq var exports)
(cons `(,var (export ,(symbol->string var)))
info)
info))
additional-info
variables)))
(add-new-top-level-frame
(make-empty-lexical-env)
0
variables
additional-info))))
))