1 files changed, 61 insertions, 0 deletions
diff --git a/src/js/mklayout.js b/src/js/mklayout.js
new file mode 100644
index 0000000..cf95091
--- /dev/null
+++ b/src/js/mklayout.js
@@ -0,0 +1,61 @@
+// writes the javascript vm's view of a memory map: the map's constants as
+// typescript and commonjs modules. the vm reads its genome image itself, from
+// genome.bin beside tinyvm.js, so only the layout is generated here. everything
+// it writes is generated, so it goes to build/js/ and nothing is left in the tree.
+//
+//   node src/js/mklayout.js [--map PATH] [--out DIR]
+//
+// the map is the default one `make` generates in build/core/map/memmap.h.
+// outputs, in the out directory:
+//   layout.ts     the map as typescript constants
+//   layout.js     the map as commonjs constants
+const fs = require('fs');
+const path = require('path');
+const root = path.join(__dirname, '..', '..');
+
+const args = process.argv.slice(2);
+const opt = (name) => {
+    const i = args.indexOf(name);
+    return i >= 0 && args[i + 1] ? args[i + 1] : null;
+};
+if (args.includes('--help') || args.includes('-h')) {
+    console.log([
+        'usage: node src/js/mklayout.js [--map PATH] [--out DIR]',
+        'converts a memory map header into the javascript vm layout files.',
+        'options:',
+        '  --map PATH      the memory map header to read; defaults to build/core/map/memmap.h',
+        '  --out DIR       where to write; defaults to build/js',
+        '  --help, -h      show this help and exit',
+    ].join('\n'));
+    process.exit(0);
+}
+for (let i = 0; i < args.length; i += 2) {
+    if (!['--map', '--out'].includes(args[i]) || args[i + 1] === undefined) {
+        console.error('mklayout: unexpected arguments: ' + args.join(' ') + '; use --help for usage');
+        process.exit(2);
+    }
+}
+
+const mapPath = opt('--map') || path.join(root, 'build', 'core', 'map', 'memmap.h');
+const outDir = opt('--out') || path.join(root, 'build', 'js');
+if (!fs.existsSync(mapPath)) {
+    console.error('mklayout: no memory map at ' + mapPath + '; run `make` first');
+    process.exit(1);
+}
+fs.mkdirSync(outDir, { recursive: true });
+
+// the compiler's map, as constants: the js vm reads them instead of its own copies.
+const { mapValues } = require('./mapvalues.js');
+const names = ['MW', 'PW', 'ZFP', 'GORG', 'DS0', 'DSLIM', 'RS0', 'RSLIM', 'SYSGATE', 'HEAP_LO', 'HEAP_HI'];
+const map = mapValues(mapPath, names);
+
+const lines = names.map(k => `    ${k}: ${map[k]},`).join('\n');
+const layoutTs = path.join(outDir, 'layout.ts');
+fs.writeFileSync(layoutTs,
+    '// generated by src/js/mklayout.js from ' + path.relative(root, mapPath) + '. do not edit.\n' +
+    'export const MAP = {\n' + lines + '\n} as const;\n');
+const layoutJs = path.join(outDir, 'layout.js');
+fs.writeFileSync(layoutJs,
+    '// generated by src/js/mklayout.js from ' + path.relative(root, mapPath) + '. do not edit.\n' +
+    'exports.MAP = ' + JSON.stringify(map, null, 4) + ';\n');
+console.log('wrote ' + path.relative(root, layoutJs) + ' and layout.ts');