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Passing This code compiles and runs correctly.
Code
// Cross-target WRAPPING arithmetic: `*%` `+%` `-%` are Zig operator spellings
// with no JavaScript counterpart. On the JS lane codegen_utils' lowerJsInto
// rewrites them — `*%` to `Math.imul(a, b)`, `+%`/`-%` to `| 0` coercions —
// and a miss there leaks the operator verbatim into output_emitted.js as a
// syntax error. The operands live in a store cell: cell reads are opaque to
// const-folding, so the operators reach the host emit as RUNTIME wrapping
// arithmetic on both lanes (literal operands would const-fold on the Zig lane
// and refuse before ever exercising the wrap). Every pair is chosen so the
// wrapping answer differs from the plain one.
import std/io
import std/store
std/store:new(w) { wa: 2000000000[i32], wb: 2147483647[i32], wc: -2147483647[i32] }
pub tor wmul { a: i32, b: i32 } -> i32
wmul -> a *% b
pub tor wadd { a: i32, b: i32 } -> i32
wadd -> a +% b
pub tor wsub { a: i32, b: i32 } -> i32
wsub -> a -% b
wmul(a: w.wa, b: 3): x |> std/io:print.ln("wmul={{ x:d }}")
wadd(a: w.wb, b: 1): y |> std/io:print.ln("wadd={{ y:d }}")
wsub(a: w.wc, b: 2): z |> std/io:print.ln("wsub={{ z:d }}")
Actual
wmul=1705032704
wadd=-2147483648
wsub=2147483647
Expected output
✓ Zig✓ JavaScriptwmul=1705032704
wadd=-2147483648
wsub=2147483647
Emitted Zig source
// Access compiler flags via the per-user compiler_env module
const CompilerEnv = @import("compiler_env").CompilerEnv;
pub const panic = if (@import("builtin").mode == .Debug)
@import("std").debug.FullPanic(@import("std").debug.defaultPanic)
else
@import("std").debug.simple_panic;
const __koru_bare = struct {
extern fn posix_memalign(memptr: *?*anyopaque, alignment: usize, size: usize) c_int;
extern fn free(ptr: ?*anyopaque) void;
fn bareAlloc(_: *anyopaque, len: usize, alignment: @import("std").mem.Alignment, _: usize) ?[*]u8 {
var p: ?*anyopaque = null;
const a = @max(alignment.toByteUnits(), @sizeOf(usize));
if (posix_memalign(&p, a, len) != 0) return null;
return @ptrCast(p);
}
fn bareResize(_: *anyopaque, _: []u8, _: @import("std").mem.Alignment, _: usize, _: usize) bool { return false; }
fn bareRemap(_: *anyopaque, _: []u8, _: @import("std").mem.Alignment, _: usize, _: usize) ?[*]u8 { return null; }
fn bareFree(_: *anyopaque, memory: []u8, _: @import("std").mem.Alignment, _: usize) void { free(@ptrCast(memory.ptr)); }
const vtable = @import("std").mem.Allocator.VTable{ .alloc = bareAlloc, .resize = bareResize, .remap = bareRemap, .free = bareFree };
const allocator = @import("std").mem.Allocator{ .ptr = undefined, .vtable = &vtable };
};
const __koru_backing = if (@import("builtin").link_libc) @import("std").heap.c_allocator else if (@import("builtin").os.tag == .freestanding) __koru_bare.allocator else @import("std").heap.page_allocator;
var __koru_leak_count: @import("std").atomic.Value(usize) = .init(0);
fn __koru_alloc(ctx: *anyopaque, len: usize, alignment: @import("std").mem.Alignment, ret_addr: usize) ?[*]u8 {
_ = ctx;
const r = __koru_backing.rawAlloc(len, alignment, ret_addr);
if (comptime @import("builtin").mode == .Debug) {
if (r != null) _ = __koru_leak_count.fetchAdd(1, .monotonic);
}
return r;
}
fn __koru_resize(ctx: *anyopaque, memory: []u8, alignment: @import("std").mem.Alignment, new_len: usize, ret_addr: usize) bool {
_ = ctx;
return __koru_backing.rawResize(memory, alignment, new_len, ret_addr);
}
fn __koru_remap(ctx: *anyopaque, memory: []u8, alignment: @import("std").mem.Alignment, new_len: usize, ret_addr: usize) ?[*]u8 {
_ = ctx;
return __koru_backing.rawRemap(memory, alignment, new_len, ret_addr);
}
fn __koru_free(ctx: *anyopaque, memory: []u8, alignment: @import("std").mem.Alignment, ret_addr: usize) void {
_ = ctx;
__koru_backing.rawFree(memory, alignment, ret_addr);
if (comptime @import("builtin").mode == .Debug) {
_ = __koru_leak_count.fetchSub(1, .monotonic);
}
}
const __koru_vtable = @import("std").mem.Allocator.VTable{ .alloc = __koru_alloc, .resize = __koru_resize, .remap = __koru_remap, .free = __koru_free };
pub fn koru_allocator() @import("std").mem.Allocator {
return .{ .ptr = undefined, .vtable = &__koru_vtable };
}
pub inline fn __koru_intcast(comptime T: type, x: anytype) T {
if (comptime (@import("builtin").mode == .Debug or @import("builtin").mode == .ReleaseSafe))
return @as(T, @intCast(x));
const dst = @typeInfo(T);
const src = @typeInfo(@TypeOf(x));
if (comptime (dst == .int and src == .int and dst.int.bits == src.int.bits and dst.int.signedness != src.int.signedness))
return @as(T, @bitCast(x));
return @as(T, @intCast(x));
}
pub fn koru_leak_check() void {
if (comptime @import("builtin").mode != .Debug) return;
if (__koru_leak_count.load(.acquire) == 0) return;
if (comptime @import("builtin").target.os.tag == .freestanding) {
if (comptime @import("builtin").cpu.arch == .wasm32 or @import("builtin").cpu.arch == .wasm64) {
@panic("KORU LEAK CHECK FAILED: the produced program leaked");
} else {
const __klc = struct { extern var stdout: ?*anyopaque; extern fn fputs(__s: [*:0]const u8, __st: ?*anyopaque) c_int; };
var __lb: [128]u8 = undefined;
const __lm = "KORU LEAK CHECK FAILED: allocations still outstanding at end of run: ";
@memcpy(__lb[0..__lm.len], __lm);
var __ln: usize = __lm.len;
var __lv = __koru_leak_count.load(.acquire);
var __ld: [20]u8 = undefined;
var __lk: usize = 0;
while (__lv > 0) : (__lk += 1) { __ld[__lk] = @intCast('0' + __lv % 10); __lv /= 10; }
for (0..__lk) |__li| { __lb[__ln] = __ld[__lk - 1 - __li]; __ln += 1; }
__lb[__ln] = '\n'; __ln += 1; __lb[__ln] = 0;
_ = __klc.fputs(@as([*:0]const u8, @ptrCast(&__lb)), __klc.stdout);
@trap();
}
} else {
@import("std").debug.print("KORU LEAK CHECK FAILED: the produced program leaked (trace above)\n", .{});
@import("std").process.exit(1);
}
}
pub const main_module = struct {
// std/store: 'w' created (cell + write-subflow at module scope); fields wa: i32, wb: i32, wc: i32
pub const wmul_event = struct {
pub const Input = struct {
a: i32,
b: i32,
};
pub const Output = i32;
pub inline fn handler(__koru_event_input: @This().Input) @This().Output {
return __koru_handler_impl(__koru_event_input.a, __koru_event_input.b);
}
fn __koru_handler_impl(__koru_p_0: i32, __koru_p_1: i32) @This().Output {
const __koru_event_input: @This().Input = .{ .a = __koru_p_0, .b = __koru_p_1 };
const a = __koru_event_input.a;
const b = __koru_event_input.b;
_ = &a;
_ = &b;
return a *% b;
}
};
pub const wadd_event = struct {
pub const Input = struct {
a: i32,
b: i32,
};
pub const Output = i32;
pub inline fn handler(__koru_event_input: @This().Input) @This().Output {
return __koru_handler_impl(__koru_event_input.a, __koru_event_input.b);
}
fn __koru_handler_impl(__koru_p_0: i32, __koru_p_1: i32) @This().Output {
const __koru_event_input: @This().Input = .{ .a = __koru_p_0, .b = __koru_p_1 };
const a = __koru_event_input.a;
const b = __koru_event_input.b;
_ = &a;
_ = &b;
return a +% b;
}
};
pub const wsub_event = struct {
pub const Input = struct {
a: i32,
b: i32,
};
pub const Output = i32;
pub inline fn handler(__koru_event_input: @This().Input) @This().Output {
return __koru_handler_impl(__koru_event_input.a, __koru_event_input.b);
}
fn __koru_handler_impl(__koru_p_0: i32, __koru_p_1: i32) @This().Output {
const __koru_event_input: @This().Input = .{ .a = __koru_p_0, .b = __koru_p_1 };
const a = __koru_event_input.a;
const b = __koru_event_input.b;
_ = &a;
_ = &b;
return a -% b;
}
};
// >>> FLOW: tests/regression/200_COMPILER_FEATURES/230_CODEGEN/230_005_wrapping_ops_cross_target/input.k:25 ~input:wmul()
pub fn flow0() void {
const x: i32 = blk: {
break :blk __koru_store_w.wa *% 3;
};
(struct { fn __kout(__fd: i32, __b: []const u8) void { if (@import("builtin").os.tag == .freestanding) { const __kc = struct { extern var stdout: ?*anyopaque; extern var stderr: ?*anyopaque; extern fn fputs(__s: [*:0]const u8, __st: ?*anyopaque) c_int; }; var __kt: [4096]u8 = undefined; for (0..(__b.len + __kt.len - 2) / (__kt.len - 1)) |__ki| { const __kn = @min(__kt.len - 1, __b.len - __ki * (__kt.len - 1)); @memcpy(__kt[0..__kn], __b[__ki * (__kt.len - 1)..][0..__kn]); __kt[__kn] = 0; @import("std").mem.doNotOptimizeAway(__kc.fputs(@as([*:0]const u8, @ptrCast(&__kt)), if (__fd == 2) __kc.stderr else __kc.stdout)); } } else { @import("std").mem.doNotOptimizeAway(@import("std").posix.write(__fd, __b) catch @as(usize, 0)); } } fn __kw(comptime __f: []const u8, __a: anytype) void { var __kb: [65536]u8 = undefined; const __ks = @import("std").fmt.bufPrint(&__kb, __f, __a) catch __kb[0..0]; __kout(1, __ks); } }).__kw("wmul={d}\n", .{x});
}
// >>> FLOW: tests/regression/200_COMPILER_FEATURES/230_CODEGEN/230_005_wrapping_ops_cross_target/input.k:26 ~input:wadd()
pub fn flow1() void {
const y: i32 = blk: {
break :blk __koru_store_w.wb +% 1;
};
(struct { fn __kout(__fd: i32, __b: []const u8) void { if (@import("builtin").os.tag == .freestanding) { const __kc = struct { extern var stdout: ?*anyopaque; extern var stderr: ?*anyopaque; extern fn fputs(__s: [*:0]const u8, __st: ?*anyopaque) c_int; }; var __kt: [4096]u8 = undefined; for (0..(__b.len + __kt.len - 2) / (__kt.len - 1)) |__ki| { const __kn = @min(__kt.len - 1, __b.len - __ki * (__kt.len - 1)); @memcpy(__kt[0..__kn], __b[__ki * (__kt.len - 1)..][0..__kn]); __kt[__kn] = 0; @import("std").mem.doNotOptimizeAway(__kc.fputs(@as([*:0]const u8, @ptrCast(&__kt)), if (__fd == 2) __kc.stderr else __kc.stdout)); } } else { @import("std").mem.doNotOptimizeAway(@import("std").posix.write(__fd, __b) catch @as(usize, 0)); } } fn __kw(comptime __f: []const u8, __a: anytype) void { var __kb: [65536]u8 = undefined; const __ks = @import("std").fmt.bufPrint(&__kb, __f, __a) catch __kb[0..0]; __kout(1, __ks); } }).__kw("wadd={d}\n", .{y});
}
// >>> FLOW: tests/regression/200_COMPILER_FEATURES/230_CODEGEN/230_005_wrapping_ops_cross_target/input.k:27 ~input:wsub()
pub fn flow2() void {
const z: i32 = blk: {
break :blk __koru_store_w.wc -% 2;
};
(struct { fn __kout(__fd: i32, __b: []const u8) void { if (@import("builtin").os.tag == .freestanding) { const __kc = struct { extern var stdout: ?*anyopaque; extern var stderr: ?*anyopaque; extern fn fputs(__s: [*:0]const u8, __st: ?*anyopaque) c_int; }; var __kt: [4096]u8 = undefined; for (0..(__b.len + __kt.len - 2) / (__kt.len - 1)) |__ki| { const __kn = @min(__kt.len - 1, __b.len - __ki * (__kt.len - 1)); @memcpy(__kt[0..__kn], __b[__ki * (__kt.len - 1)..][0..__kn]); __kt[__kn] = 0; @import("std").mem.doNotOptimizeAway(__kc.fputs(@as([*:0]const u8, @ptrCast(&__kt)), if (__fd == 2) __kc.stderr else __kc.stdout)); } } else { @import("std").mem.doNotOptimizeAway(@import("std").posix.write(__fd, __b) catch @as(usize, 0)); } } fn __kw(comptime __f: []const u8, __a: anytype) void { var __kb: [65536]u8 = undefined; const __ks = @import("std").fmt.bufPrint(&__kb, __f, __a) catch __kb[0..0]; __kout(1, __ks); } }).__kw("wsub={d}\n", .{z});
}
pub fn koru_start_flow() void {
const result_0 = koru_koru.start_event.handler(.{ });
const result_0_done = result_0.done;
_ = &result_0_done;
}
pub fn koru_end_flow() void {
const result_0 = koru_koru.end_event.handler(.{ });
const result_0_done = result_0.done;
_ = &result_0_done;
}
const __KoruStoreT_w = blk: {
const __info = @typeInfo(@TypeOf(.{ .wa = @as(i32, 2000000000), .wb = @as(i32, 2147483647), .wc = @as(i32, -2147483647) }));
var __fields: [__info.@"struct".fields.len]@import("std").builtin.Type.StructField = undefined;
for (__info.@"struct".fields, 0..) |__f, __i| {
__fields[__i] = .{ .name = __f.name, .type = __f.type, .default_value_ptr = null, .is_comptime = false, .alignment = __f.alignment };
}
break :blk @Type(.{ .@"struct" = .{ .layout = .auto, .fields = &__fields, .decls = &.{}, .is_tuple = false } });
};
var __koru_store_w: __KoruStoreT_w = .{ .wa = @as(i32, 2000000000), .wb = @as(i32, 2147483647), .wc = @as(i32, -2147483647) };
pub const __store_apply_w_event = struct {
pub const Input = struct {
field: i64,
value: i32,
};
pub const Output = union(enum(u8)) {
wa: i32,
wb: i32,
wc: i32,
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
// >>> PROC: __store_apply_w [tests/regression/200_COMPILER_FEATURES/230_CODEGEN/230_005_wrapping_ops_cross_target/input.k:14]
const field = __koru_event_input.field;
const value = __koru_event_input.value;
_ = &field;
_ = &value;
_ = &__koru_event_input;
return switch (field) {
0 => blk: { __koru_store_w.wa = value; break :blk .{ .wa = value }; },
1 => blk: { __koru_store_w.wb = value; break :blk .{ .wb = value }; },
2 => blk: { __koru_store_w.wc = value; break :blk .{ .wc = value }; },
else => unreachable,
};
}
};
pub const __store_announce_w_event = struct {
pub const Input = struct {
field: i64,
};
pub const Output = void;
pub inline fn handler(__koru_event_input: @This().Input) @This().Output {
return __koru_handler_impl(__koru_event_input.field);
}
fn __koru_handler_impl(__koru_p_0: i64) @This().Output {
const __koru_event_input: @This().Input = .{ .field = __koru_p_0 };
// >>> PROC: __store_announce_w [tests/regression/200_COMPILER_FEATURES/230_CODEGEN/230_005_wrapping_ops_cross_target/input.k:14]
const field = __koru_event_input.field;
_ = &field;
_ = &__koru_event_input;
return;
}
};
};
pub const koru_koru = struct {
pub const start_event = struct {
pub const Input = struct {
};
pub const Output = union(enum(u8)) {
done: struct {
},
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
_ = &__koru_event_input;
return .{ .done = .{} };
}
};
pub const end_event = struct {
pub const Input = struct {
};
pub const Output = union(enum(u8)) {
done: struct {
},
};
pub fn handler(__koru_event_input: @This().Input) @This().Output {
_ = &__koru_event_input;
return .{ .done = .{} };
}
};
};
pub fn main() void {
main_module.koru_start_flow();
main_module.flow0();
main_module.flow1();
main_module.flow2();
main_module.koru_end_flow();
if (comptime @import("builtin").mode == .Debug) koru_leak_check();
}
test {
@import("std").testing.refAllDeclsRecursive(@This());
}
Flows
flow ~new click a branch to expand · @labels scroll to their anchor
new (w, source: wa: 2000000000[i32], wb: 2147483647[i32], wc: -2147483647[i32])
flow ~wmul click a branch to expand · @labels scroll to their anchor
wmul (a: w.wa, b: 3)
flow ~wadd click a branch to expand · @labels scroll to their anchor
wadd (a: w.wb, b: 1)
flow ~wsub click a branch to expand · @labels scroll to their anchor
wsub (a: w.wc, b: 2)
Test Configuration
MUST_RUN LANGUAGES: zig js