471 lines
13 KiB
Zig
471 lines
13 KiB
Zig
const std = @import("std");
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const assert = std.debug.assert;
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const mem = std.mem;
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test "int to ptr cast" {
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const x = usize(13);
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const y = @intToPtr(*u8, x);
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const z = @ptrToInt(y);
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assert(z == 13);
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}
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test "integer literal to pointer cast" {
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const vga_mem = @intToPtr(*u16, 0xB8000);
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assert(@ptrToInt(vga_mem) == 0xB8000);
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}
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test "pointer reinterpret const float to int" {
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const float: f64 = 5.99999999999994648725e-01;
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const float_ptr = &float;
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const int_ptr = @ptrCast(*const i32, float_ptr);
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const int_val = int_ptr.*;
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assert(int_val == 858993411);
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}
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test "implicitly cast a pointer to a const pointer of it" {
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var x: i32 = 1;
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const xp = &x;
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funcWithConstPtrPtr(xp);
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assert(x == 2);
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}
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fn funcWithConstPtrPtr(x: *const *i32) void {
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x.*.* += 1;
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}
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test "implicitly cast a container to a const pointer of it" {
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const z = Struct(void){ .x = void{} };
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assert(0 == @sizeOf(@typeOf(z)));
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assert(void{} == Struct(void).pointer(z).x);
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assert(void{} == Struct(void).pointer(&z).x);
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assert(void{} == Struct(void).maybePointer(z).x);
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assert(void{} == Struct(void).maybePointer(&z).x);
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assert(void{} == Struct(void).maybePointer(null).x);
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const s = Struct(u8){ .x = 42 };
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assert(0 != @sizeOf(@typeOf(s)));
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assert(42 == Struct(u8).pointer(s).x);
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assert(42 == Struct(u8).pointer(&s).x);
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assert(42 == Struct(u8).maybePointer(s).x);
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assert(42 == Struct(u8).maybePointer(&s).x);
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assert(0 == Struct(u8).maybePointer(null).x);
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const u = Union{ .x = 42 };
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assert(42 == Union.pointer(u).x);
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assert(42 == Union.pointer(&u).x);
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assert(42 == Union.maybePointer(u).x);
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assert(42 == Union.maybePointer(&u).x);
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assert(0 == Union.maybePointer(null).x);
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const e = Enum.Some;
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assert(Enum.Some == Enum.pointer(e));
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assert(Enum.Some == Enum.pointer(&e));
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assert(Enum.Some == Enum.maybePointer(e));
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assert(Enum.Some == Enum.maybePointer(&e));
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assert(Enum.None == Enum.maybePointer(null));
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}
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fn Struct(comptime T: type) type {
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return struct {
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const Self = this;
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x: T,
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fn pointer(self: *const Self) Self {
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return self.*;
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}
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fn maybePointer(self: ?*const Self) Self {
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const none = Self{ .x = if (T == void) void{} else 0 };
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return (self orelse &none).*;
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}
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};
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}
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const Union = union {
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x: u8,
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fn pointer(self: *const Union) Union {
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return self.*;
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}
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fn maybePointer(self: ?*const Union) Union {
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const none = Union{ .x = 0 };
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return (self orelse &none).*;
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}
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};
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const Enum = enum {
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None,
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Some,
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fn pointer(self: *const Enum) Enum {
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return self.*;
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}
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fn maybePointer(self: ?*const Enum) Enum {
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return (self orelse &Enum.None).*;
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}
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};
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test "implicitly cast indirect pointer to maybe-indirect pointer" {
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const S = struct {
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const Self = this;
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x: u8,
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fn constConst(p: *const *const Self) u8 {
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return p.*.x;
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}
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fn maybeConstConst(p: ?*const *const Self) u8 {
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return p.?.*.x;
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}
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fn constConstConst(p: *const *const *const Self) u8 {
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return p.*.*.x;
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}
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fn maybeConstConstConst(p: ?*const *const *const Self) u8 {
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return p.?.*.*.x;
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}
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};
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const s = S{ .x = 42 };
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const p = &s;
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const q = &p;
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const r = &q;
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assert(42 == S.constConst(p));
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assert(42 == S.constConst(q));
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assert(42 == S.maybeConstConst(p));
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assert(42 == S.maybeConstConst(q));
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assert(42 == S.constConstConst(q));
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assert(42 == S.constConstConst(r));
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assert(42 == S.maybeConstConstConst(q));
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assert(42 == S.maybeConstConstConst(r));
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}
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test "explicit cast from integer to error type" {
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testCastIntToErr(error.ItBroke);
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comptime testCastIntToErr(error.ItBroke);
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}
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fn testCastIntToErr(err: error) void {
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const x = @errorToInt(err);
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const y = @intToError(x);
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assert(error.ItBroke == y);
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}
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test "peer resolve arrays of different size to const slice" {
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assert(mem.eql(u8, boolToStr(true), "true"));
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assert(mem.eql(u8, boolToStr(false), "false"));
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comptime assert(mem.eql(u8, boolToStr(true), "true"));
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comptime assert(mem.eql(u8, boolToStr(false), "false"));
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}
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fn boolToStr(b: bool) []const u8 {
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return if (b) "true" else "false";
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}
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test "peer resolve array and const slice" {
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testPeerResolveArrayConstSlice(true);
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comptime testPeerResolveArrayConstSlice(true);
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}
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fn testPeerResolveArrayConstSlice(b: bool) void {
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const value1 = if (b) "aoeu" else ([]const u8)("zz");
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const value2 = if (b) ([]const u8)("zz") else "aoeu";
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assert(mem.eql(u8, value1, "aoeu"));
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assert(mem.eql(u8, value2, "zz"));
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}
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test "integer literal to &const int" {
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const x: *const i32 = 3;
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assert(x.* == 3);
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}
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test "string literal to &const []const u8" {
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const x: *const []const u8 = "hello";
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assert(mem.eql(u8, x.*, "hello"));
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}
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test "implicitly cast from T to error!?T" {
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castToOptionalTypeError(1);
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comptime castToOptionalTypeError(1);
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}
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const A = struct {
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a: i32,
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};
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fn castToOptionalTypeError(z: i32) void {
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const x = i32(1);
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const y: error!?i32 = x;
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assert((try y).? == 1);
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const f = z;
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const g: error!?i32 = f;
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const a = A{ .a = z };
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const b: error!?A = a;
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assert((b catch unreachable).?.a == 1);
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}
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test "implicitly cast from int to error!?T" {
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implicitIntLitToOptional();
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comptime implicitIntLitToOptional();
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}
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fn implicitIntLitToOptional() void {
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const f: ?i32 = 1;
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const g: error!?i32 = 1;
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}
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test "return null from fn() error!?&T" {
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const a = returnNullFromOptionalTypeErrorRef();
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const b = returnNullLitFromOptionalTypeErrorRef();
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assert((try a) == null and (try b) == null);
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}
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fn returnNullFromOptionalTypeErrorRef() error!?*A {
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const a: ?*A = null;
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return a;
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}
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fn returnNullLitFromOptionalTypeErrorRef() error!?*A {
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return null;
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}
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test "peer type resolution: ?T and T" {
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assert(peerTypeTAndOptionalT(true, false).? == 0);
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assert(peerTypeTAndOptionalT(false, false).? == 3);
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comptime {
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assert(peerTypeTAndOptionalT(true, false).? == 0);
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assert(peerTypeTAndOptionalT(false, false).? == 3);
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}
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}
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fn peerTypeTAndOptionalT(c: bool, b: bool) ?usize {
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if (c) {
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return if (b) null else usize(0);
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}
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return usize(3);
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}
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test "peer type resolution: [0]u8 and []const u8" {
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assert(peerTypeEmptyArrayAndSlice(true, "hi").len == 0);
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assert(peerTypeEmptyArrayAndSlice(false, "hi").len == 1);
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comptime {
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assert(peerTypeEmptyArrayAndSlice(true, "hi").len == 0);
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assert(peerTypeEmptyArrayAndSlice(false, "hi").len == 1);
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}
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}
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fn peerTypeEmptyArrayAndSlice(a: bool, slice: []const u8) []const u8 {
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if (a) {
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return []const u8{};
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}
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return slice[0..1];
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}
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test "implicitly cast from [N]T to ?[]const T" {
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assert(mem.eql(u8, castToOptionalSlice().?, "hi"));
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comptime assert(mem.eql(u8, castToOptionalSlice().?, "hi"));
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}
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fn castToOptionalSlice() ?[]const u8 {
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return "hi";
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}
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test "implicitly cast from [0]T to error![]T" {
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testCastZeroArrayToErrSliceMut();
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comptime testCastZeroArrayToErrSliceMut();
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}
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fn testCastZeroArrayToErrSliceMut() void {
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assert((gimmeErrOrSlice() catch unreachable).len == 0);
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}
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fn gimmeErrOrSlice() error![]u8 {
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return []u8{};
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}
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test "peer type resolution: [0]u8, []const u8, and error![]u8" {
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{
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var data = "hi";
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const slice = data[0..];
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assert((try peerTypeEmptyArrayAndSliceAndError(true, slice)).len == 0);
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assert((try peerTypeEmptyArrayAndSliceAndError(false, slice)).len == 1);
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}
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comptime {
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var data = "hi";
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const slice = data[0..];
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assert((try peerTypeEmptyArrayAndSliceAndError(true, slice)).len == 0);
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assert((try peerTypeEmptyArrayAndSliceAndError(false, slice)).len == 1);
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}
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}
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fn peerTypeEmptyArrayAndSliceAndError(a: bool, slice: []u8) error![]u8 {
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if (a) {
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return []u8{};
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}
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return slice[0..1];
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}
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test "resolve undefined with integer" {
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testResolveUndefWithInt(true, 1234);
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comptime testResolveUndefWithInt(true, 1234);
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}
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fn testResolveUndefWithInt(b: bool, x: i32) void {
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const value = if (b) x else undefined;
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if (b) {
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assert(value == x);
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}
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}
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test "implicit cast from &const [N]T to []const T" {
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testCastConstArrayRefToConstSlice();
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comptime testCastConstArrayRefToConstSlice();
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}
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fn testCastConstArrayRefToConstSlice() void {
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const blah = "aoeu";
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const const_array_ref = &blah;
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assert(@typeOf(const_array_ref) == *const [4]u8);
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const slice: []const u8 = const_array_ref;
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assert(mem.eql(u8, slice, "aoeu"));
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}
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test "peer type resolution: error and [N]T" {
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// TODO: implicit error!T to error!U where T can implicitly cast to U
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//assert(mem.eql(u8, try testPeerErrorAndArray(0), "OK"));
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//comptime assert(mem.eql(u8, try testPeerErrorAndArray(0), "OK"));
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assert(mem.eql(u8, try testPeerErrorAndArray2(1), "OKK"));
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comptime assert(mem.eql(u8, try testPeerErrorAndArray2(1), "OKK"));
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}
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//fn testPeerErrorAndArray(x: u8) error![]const u8 {
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// return switch (x) {
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// 0x00 => "OK",
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// else => error.BadValue,
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// };
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//}
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fn testPeerErrorAndArray2(x: u8) error![]const u8 {
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return switch (x) {
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0x00 => "OK",
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0x01 => "OKK",
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else => error.BadValue,
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};
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}
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test "@floatToInt" {
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testFloatToInts();
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comptime testFloatToInts();
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}
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fn testFloatToInts() void {
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const x = i32(1e4);
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assert(x == 10000);
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const y = @floatToInt(i32, f32(1e4));
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assert(y == 10000);
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expectFloatToInt(f16, 255.1, u8, 255);
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expectFloatToInt(f16, 127.2, i8, 127);
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expectFloatToInt(f16, -128.2, i8, -128);
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expectFloatToInt(f32, 255.1, u8, 255);
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expectFloatToInt(f32, 127.2, i8, 127);
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expectFloatToInt(f32, -128.2, i8, -128);
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}
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fn expectFloatToInt(comptime F: type, f: F, comptime I: type, i: I) void {
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assert(@floatToInt(I, f) == i);
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}
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test "cast u128 to f128 and back" {
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comptime testCast128();
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testCast128();
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}
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fn testCast128() void {
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assert(cast128Int(cast128Float(0x7fff0000000000000000000000000000)) == 0x7fff0000000000000000000000000000);
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}
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fn cast128Int(x: f128) u128 {
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return @bitCast(u128, x);
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}
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fn cast128Float(x: u128) f128 {
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return @bitCast(f128, x);
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}
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test "const slice widen cast" {
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const bytes align(4) = []u8{
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0x12,
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0x12,
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0x12,
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0x12,
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};
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const u32_value = @bytesToSlice(u32, bytes[0..])[0];
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assert(u32_value == 0x12121212);
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assert(@bitCast(u32, bytes) == 0x12121212);
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}
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test "single-item pointer of array to slice and to unknown length pointer" {
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testCastPtrOfArrayToSliceAndPtr();
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comptime testCastPtrOfArrayToSliceAndPtr();
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}
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fn testCastPtrOfArrayToSliceAndPtr() void {
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var array = "ao" ++ "eu"; // TODO https://github.com/ziglang/zig/issues/1076
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const x: [*]u8 = &array;
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x[0] += 1;
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assert(mem.eql(u8, array[0..], "boeu"));
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const y: []u8 = &array;
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y[0] += 1;
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assert(mem.eql(u8, array[0..], "coeu"));
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}
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test "cast *[1][*]const u8 to [*]const ?[*]const u8" {
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const window_name = [1][*]const u8{c"window name"};
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const x: [*]const ?[*]const u8 = &window_name;
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assert(mem.eql(u8, std.cstr.toSliceConst(x[0].?), "window name"));
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}
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test "@intCast comptime_int" {
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const result = @intCast(i32, 1234);
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assert(@typeOf(result) == i32);
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assert(result == 1234);
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}
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test "@floatCast comptime_int and comptime_float" {
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{
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const result = @floatCast(f16, 1234);
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assert(@typeOf(result) == f16);
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assert(result == 1234.0);
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}
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{
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const result = @floatCast(f16, 1234.0);
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assert(@typeOf(result) == f16);
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assert(result == 1234.0);
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}
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{
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const result = @floatCast(f32, 1234);
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assert(@typeOf(result) == f32);
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assert(result == 1234.0);
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}
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{
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const result = @floatCast(f32, 1234.0);
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assert(@typeOf(result) == f32);
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assert(result == 1234.0);
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}
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}
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test "comptime_int @intToFloat" {
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{
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const result = @intToFloat(f16, 1234);
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assert(@typeOf(result) == f16);
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assert(result == 1234.0);
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}
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{
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const result = @intToFloat(f32, 1234);
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assert(@typeOf(result) == f32);
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assert(result == 1234.0);
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}
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}
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test "@bytesToSlice keeps pointer alignment" {
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var bytes = []u8{ 0x01, 0x02, 0x03, 0x04 };
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const numbers = @bytesToSlice(u32, bytes[0..]);
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comptime assert(@typeOf(numbers) == []align(@alignOf(@typeOf(bytes))) u32);
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}
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test "@intCast i32 to u7" {
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var x: u128 = @maxValue(u128);
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var y: i32 = 120;
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var z = x >> @intCast(u7, y);
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assert(z == 0xff);
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}
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