Merge pull request bellard#418 from nickva/fix-byteoffset-for-detached-array-buffers

Fix byteOffset for detached array buffers

Author: bellard

.github/workflows/ci.yml

@@ -214,6 +214,7 @@ jobs:
           submodules: true
       - name: Install MinGW and Wine
         run: |
+          sudo apt update
           sudo apt install -y wine mingw-w64
           cp /usr/x86_64-w64-mingw32/lib/libwinpthread-1.dll .
       - name: Setup Wine

quickjs.c

@@ -54017,7 +54017,8 @@ static JSValue js_typed_array_subarray(JSContext *ctx, JSValueConst this_val,
                                        int argc, JSValueConst *argv)
 {
     JSValueConst args[4];
-    JSValue arr, byteOffset, ta_buffer;
+    JSValue arr, ta_buffer;
+    JSTypedArray *ta;
     JSObject *p;
     int len, start, final, count, shift, offset;
 
@@ -54034,12 +54035,10 @@ static JSValue js_typed_array_subarray(JSContext *ctx, JSValueConst this_val,
             goto exception;
     }
     count = max_int(final - start, 0);
-    byteOffset = js_typed_array_get_byteOffset(ctx, this_val, 0);
-    if (JS_IsException(byteOffset))
-        goto exception;
     shift = typed_array_size_log2(p->class_id);
-    offset = JS_VALUE_GET_INT(byteOffset) + (start << shift);
-    JS_FreeValue(ctx, byteOffset);
+    ta = p->u.typed_array;
+    /* Read byteOffset (ta->offset) even if detached */
+    offset = ta->offset + (start << shift);
     ta_buffer = js_typed_array_get_buffer(ctx, this_val, 0);
     if (JS_IsException(ta_buffer))
         goto exception;

test262_errors.txt

@@ -23,7 +23,6 @@ test262/test/staging/sm/TypedArray/prototype-constructor-identity.js:17: Test262
 test262/test/staging/sm/TypedArray/set-detached-bigint.js:27: Error: Assertion failed: expected exception SyntaxError, got RangeError: invalid array length
 test262/test/staging/sm/TypedArray/set-detached.js:112: RangeError: invalid array length
 test262/test/staging/sm/TypedArray/sort_modifications.js:12: Test262Error: Int8Array at index 0 for size 4 Expected SameValue(«0», «1») to be true
-test262/test/staging/sm/TypedArray/subarray.js:15: Test262Error: Expected SameValue(«0», «1») to be true
 test262/test/staging/sm/async-functions/async-contains-unicode-escape.js:45: Error: Assertion failed: expected exception SyntaxError, no exception thrown
 test262/test/staging/sm/async-functions/await-error.js:12: Test262Error: Expected SameValue(«false», «true») to be true
 test262/test/staging/sm/async-functions/await-in-arrow-parameters.js:33: Error: Assertion failed: expected exception SyntaxError, no exception thrown - AsyncFunction:(a = (b = await/r/g) => {}) => {}