Commit cd5644a350c66679340731cc00c9fcf16834bdb9
added globals injection script
wanderer committed on 2/20/2018, 11:42:18 PMParent: 9babf4f2b9100d276b3b4aa9195653cf32fc388d
Files changed
| injectGlobals.js | added |
| injectGlobals.js | ||
|---|---|---|
| @@ -1,0 +1,103 @@ | ||
| 1 | +const {findSections} = require('wasm-json-toolkit') | |
| 2 | +const wantedSections = ['type', 'import', 'function', 'export', 'code'] | |
| 3 | + | |
| 4 | +module.exports = function injectGlobals (json, globals) { | |
| 5 | + const iter = findSections(json, wantedSections) | |
| 6 | + const {value: type} = iter.next() | |
| 7 | + const getterType = type.entries.push(typeEntry()) - 1 | |
| 8 | + const setterType = type.entries.push(typeEntry(Array(globals.length).fill('i32'))) - 1 | |
| 9 | + | |
| 10 | + const {value: imports = {entries: []}} = iter.next() | |
| 11 | + const {value: func} = iter.next() | |
| 12 | + const getterIndex = func.entries.push(getterType) - 1 + imports.entries.length | |
| 13 | + const setterIndex = func.entries.push(setterType) - 1 + imports.entries.length | |
| 14 | + const {value: exports} = iter.next() | |
| 15 | + exports.entries.push(exportEntry('getter_globals', getterIndex)) | |
| 16 | + exports.entries.push(exportEntry('setter_globals', setterIndex)) | |
| 17 | + const {value: code} = iter.next() | |
| 18 | + const getterCode = [] | |
| 19 | + const setterCode = [] | |
| 20 | + globals.forEach((globalIndex, index) => { | |
| 21 | + // getter | |
| 22 | + getterCode.push(i32_const(index * 4)) | |
| 23 | + getterCode.push(get_global(globalIndex)) | |
| 24 | + getterCode.push(i32_store()) | |
| 25 | + // setter | |
| 26 | + setterCode.push(get_local(index)) | |
| 27 | + setterCode.push(set_global(globalIndex)) | |
| 28 | + }) | |
| 29 | + | |
| 30 | + getterCode.push(end()) | |
| 31 | + setterCode.push(end()) | |
| 32 | + code.entries.push(section_code([], getterCode)) | |
| 33 | + code.entries.push(section_code([], setterCode)) | |
| 34 | + return json | |
| 35 | +} | |
| 36 | + | |
| 37 | +function exportEntry (field_str, index) { | |
| 38 | + return { | |
| 39 | + field_str, | |
| 40 | + kind: 'function', | |
| 41 | + index | |
| 42 | + } | |
| 43 | +} | |
| 44 | + | |
| 45 | +function typeEntry (params = []) { | |
| 46 | + return { | |
| 47 | + form: 'func', | |
| 48 | + params: params | |
| 49 | + } | |
| 50 | +} | |
| 51 | + | |
| 52 | +function end () { | |
| 53 | + return { | |
| 54 | + name: 'end' | |
| 55 | + } | |
| 56 | +} | |
| 57 | + | |
| 58 | +function get_local (index) { | |
| 59 | + return { | |
| 60 | + name: 'get_local', | |
| 61 | + immediates: index | |
| 62 | + } | |
| 63 | +} | |
| 64 | + | |
| 65 | +function get_global (index) { | |
| 66 | + return { | |
| 67 | + name: 'get_global', | |
| 68 | + immediates: index | |
| 69 | + } | |
| 70 | +} | |
| 71 | + | |
| 72 | +function set_global (index) { | |
| 73 | + return { | |
| 74 | + name: 'set_global', | |
| 75 | + immediates: index | |
| 76 | + } | |
| 77 | +} | |
| 78 | + | |
| 79 | +function i32_const (num) { | |
| 80 | + return { | |
| 81 | + 'return_type': 'i32', | |
| 82 | + 'name': 'const', | |
| 83 | + 'immediates': num | |
| 84 | + } | |
| 85 | +} | |
| 86 | + | |
| 87 | +function i32_store () { | |
| 88 | + return { | |
| 89 | + 'return_type': 'i32', | |
| 90 | + 'name': 'store', | |
| 91 | + 'immediates': { | |
| 92 | + 'flags': 2, | |
| 93 | + 'offset': 0 | |
| 94 | + } | |
| 95 | + } | |
| 96 | +} | |
| 97 | + | |
| 98 | +function section_code (locals, code) { | |
| 99 | + return { | |
| 100 | + locals: locals, | |
| 101 | + code: code | |
| 102 | + } | |
| 103 | +} | |
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