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runtime: fix returning an empty array crash

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This commit is contained in:
Pierre Tachoire
2025-08-08 17:26:39 +02:00
parent fbd40a6514
commit b785884cd8
2 changed files with 15 additions and 5 deletions
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15
src/runtime/js.zig
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@@ -3469,11 +3469,16 @@ fn simpleZigValueToJs(isolate: v8.Isolate, value: anytype, comptime fail: bool)
else => @compileError("Invalid TypeArray type: " ++ @typeName(value_type)),
};
const buffer_len = len * bits / 8;
const backing_store = v8.BackingStore.init(isolate, buffer_len);
const data: [*]u8 = @alignCast(@ptrCast(backing_store.getData()));
@memcpy(data[0..buffer_len], @as([]const u8, @ptrCast(values))[0..buffer_len]);
const array_buffer = v8.ArrayBuffer.initWithBackingStore(isolate, &backing_store.toSharedPtr());
var array_buffer: v8.ArrayBuffer = undefined;
if (len == 0) {
array_buffer = v8.ArrayBuffer.init(isolate, 0);
} else {
const buffer_len = len * bits / 8;
const backing_store = v8.BackingStore.init(isolate, buffer_len);
const data: [*]u8 = @alignCast(@ptrCast(backing_store.getData()));
@memcpy(data[0..buffer_len], @as([]const u8, @ptrCast(values))[0..buffer_len]);
array_buffer = v8.ArrayBuffer.initWithBackingStore(isolate, &backing_store.toSharedPtr());
}
switch (@typeInfo(value_type)) {
.int => |n| switch (n.signedness) {

5
src/runtime/test_primitive_types.zig
View File

@@ -118,6 +118,10 @@ const Primitives = struct {
}
}
pub fn _returnEmptyUint8(_: *const Primitives) Env.TypedArray(u8) {
return .{ .values = &.{} };
}
pub fn _returnUint8(_: *const Primitives) Env.TypedArray(u8) {
return .{ .values = &.{ 10, 20, 250 } };
}
@@ -325,6 +329,7 @@ test "JS: primitive types" {
.{ "try { p.intu64(arr_i64) } catch(e) { e instanceof TypeError; }", "true" },
.{ "try { p.intu64(arr_u32) } catch(e) { e instanceof TypeError; }", "true" },
.{ "p.returnEmptyUint8()", "" },
.{ "p.returnUint8()", "10,20,250" },
.{ "p.returnInt8()", "10,-20,-120" },
.{ "p.returnUint16()", "10,200,2050" },