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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-runtime)
(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-values
(((definitions non-definitions)
(partition definition?
(if (library-has-declaration? 'begin library)
(library-declarations 'begin library)
(raise-compilation-error "No begin declaration in library" library)))))
(let*
((imports
(library-declarations 'import library))
(exports
(library-declarations 'export library))
;; Compile runtime library definitions to program
(program
(fold compile-runtime-library-definitions program imports))
;; Compile runtime library functions to program
(program
(fold compile-runtime-library program imports))
;; Extract runtime function bindings from program
(runtime-bindings
(fold
(lambda (library bindings)
(append
(runtime-exports program library)
bindings))
'()
imports))
;; Add runtime function indices to function table
(program
(fold
(lambda (runtime-binding program)
(compiled-program-add-definition
program
`(elem ,(cdr runtime-binding))))
program
runtime-bindings))
(definition-names
(map definition-variable definitions))
;; Create global lexical environment
(lexical-env
(make-global-lexical-env
(append
;; Create unbound slots for globals from runtime imports
(make-list (compiled-program-definitions-count program 'global) #f)
(map car runtime-bindings))
definition-names
exports))
;; Add global function values for runtime functions
(program
(do ((bindings runtime-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)))
;; Add export definitions for exported runtime functions
(program
(fold
(lambda (runtime-binding program)
(if (and (memq (car runtime-binding) exports)
(not (memq (car runtime-binding) definition-names)))
(compiled-program-add-definition
program
`(export
,(symbol->string (car runtime-binding))
(func ,(cdr runtime-binding))))
program))
program
runtime-bindings))
;; Add globals for top-level variables
(program
(compiled-program-with-definitions-and-value-code
program
(make-list (length definitions)
`(global (mut i32) (i32.const ,uninitialized-value)))
'()))
;; Compile top-level code and globals initialisation
(program
(let*
((definitions-init-assignments
(map (lambda (definition)
`(set! ,(definition-variable definition) ,(definition-value definition)))
definitions))
(non-definitions
(append definitions-init-assignments non-definitions)))
(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))
'())))))
;; Add function table definition
(program
(let ((elem-defs-count
(compiled-program-definitions-count program 'elem)))
(if (= elem-defs-count 0)
program
(compiled-program-add-definition
program
`(table ,elem-defs-count funcref))))))
program)))
(define (compile-program-to-module program)
(let*
((get-module-definitions
(lambda (type)
(compiled-program-get-definitions program type)))
(elem-definition
(let ((elem-func-indices
(map wasm-elem-definition-func-index
(get-module-definitions 'elem))))
(if (null? elem-func-indices)
'()
`((elem (i32.const 0) func ,@elem-func-indices))))))
(let-values
(((global-imports global-definitions)
(partition wasm-import-definition?
(get-module-definitions 'global)))
((func-imports func-definitions)
(partition wasm-import-definition?
(get-module-definitions 'func))))
`(module
,@(get-module-definitions 'type)
,@global-imports
,@func-imports
,@func-definitions
,@(get-module-definitions 'table)
,@(get-module-definitions 'memory)
,@global-definitions
,@(get-module-definitions 'export)
,@(get-module-definitions 'start)
,@elem-definition
,@(literal-data-definitions program)))))
(define (make-global-lexical-env imported-identifiers defined-variables exports)
(let ((duplicate-import (first-duplicate (filter symbol? imported-identifiers))))
(unless (null? duplicate-import)
(raise-compilation-error "Duplicate imported identifier" (car duplicate-import))))
(let ((duplicate-var (first-duplicate (filter symbol? defined-variables))))
(unless (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)
(unless (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))))
))