codegen: support map in for..of

test262: 50.94% (+0.01) | 🧪 48381 | 🤠 24645 (+6) | ❌ 6946 | 💀 15246 (-6) | 🏗️ 147 | 💥 329 | ⏰ 132 | 📝 936

compiler/codegen.js

@@ -4569,6 +4569,77 @@ const generateForOf = (scope, decl) => {
       [ Opcodes.br, depth.length - prevDepth ]
     ] ],
 
+    [ TYPES.map, () => [
+      // length is actually keys pointer
+      // if counter == length then break
+      [ Opcodes.local_get, counter ],
+      [ Opcodes.local_get, length ],
+      [ Opcodes.i32_load, Math.log2(ValtypeSize.i32) - 1, 0 ],
+      [ Opcodes.i32_eq ],
+      [ Opcodes.br_if, depth.length - prevDepth ],
+
+      // allocate out array
+      ...number(128, Valtype.i32),
+      [ Opcodes.call, includeBuiltin(scope, '__Porffor_allocateBytes').index ],
+      [ Opcodes.local_tee, localTmp(scope, '#forof_allocd', Valtype.i32) ],
+
+      // set length to 2
+      ...number(2, Valtype.i32),
+      [ Opcodes.i32_store, 0, 0 ],
+
+      // use as pointer for stores later
+      [ Opcodes.local_get, localTmp(scope, '#forof_allocd', Valtype.i32) ],
+      [ Opcodes.local_get, localTmp(scope, '#forof_allocd', Valtype.i32) ],
+      [ Opcodes.local_get, localTmp(scope, '#forof_allocd', Valtype.i32) ],
+      [ Opcodes.local_get, localTmp(scope, '#forof_allocd', Valtype.i32) ],
+
+      // set [0] as key
+      [ Opcodes.local_get, length ],
+      [ Opcodes.local_get, counter ],
+      [ Opcodes.i32_const, 9 ],
+      [ Opcodes.i32_mul ],
+      [ Opcodes.i32_add ],
+      [ Opcodes.local_set, localTmp(scope, '#forof_mapptr', Valtype.i32) ],
+
+      [ Opcodes.local_get, localTmp(scope, '#forof_mapptr', Valtype.i32) ],
+      [ Opcodes.f64_load, 0, 4 ],
+      [ Opcodes.f64_store, 0, 4 ],
+
+      [ Opcodes.local_get, localTmp(scope, '#forof_mapptr', Valtype.i32) ],
+      [ Opcodes.i32_load8_u, 0, 12 ],
+      [ Opcodes.i32_store8, 0, 12 ],
+
+      // set [1] as value
+      [ Opcodes.local_get, pointer ],
+      [ Opcodes.i32_load, Math.log2(ValtypeSize.i32) - 1, 4 ],
+      [ Opcodes.local_get, counter ],
+      [ Opcodes.i32_const, 9 ],
+      [ Opcodes.i32_mul ],
+      [ Opcodes.i32_add ],
+      [ Opcodes.local_set, localTmp(scope, '#forof_mapptr', Valtype.i32) ],
+
+      [ Opcodes.local_get, localTmp(scope, '#forof_mapptr', Valtype.i32) ],
+      [ Opcodes.f64_load, 0, 4 ],
+      [ Opcodes.f64_store, 0, 13 ],
+
+      [ Opcodes.local_get, localTmp(scope, '#forof_mapptr', Valtype.i32) ],
+      [ Opcodes.i32_load8_u, 0, 12 ],
+      [ Opcodes.i32_store8, 0, 21 ],
+
+      // increment counter
+      [ Opcodes.local_get, counter ],
+      ...number(1, Valtype.i32),
+      [ Opcodes.i32_add ],
+      [ Opcodes.local_set, counter ],
+
+      // get new array (page)
+      [ Opcodes.local_get, localTmp(scope, '#forof_allocd', Valtype.i32) ],
+      Opcodes.i32_from_u,
+
+      // set type to array
+      ...setLastType(scope, TYPES.array)
+    ] ],
+
     // note: should be impossible to reach?
     [ 'default', [ [ Opcodes.unreachable ] ] ]
   ], valtypeBinary);

package.json

@@ -1,7 +1,7 @@
 {
   "name": "porffor",
   "description": "a basic experimental wip aot optimizing js -> wasm engine/compiler/runtime in js",
-  "version": "0.50.4",
+  "version": "0.50.5",
   "author": "CanadaHonk",
   "license": "MIT",
   "scripts": {},

runner/index.js

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 import fs from 'node:fs';
-globalThis.version = '0.50.4';
+globalThis.version = '0.50.5';
 
 // deno compat
 if (typeof process === 'undefined' && typeof Deno !== 'undefined') {