mirror of
https://github.com/ziglang/zig.git
synced 2026-02-12 20:37:54 +00:00
cast -> cast_llvm, cast_c -> cast (doesn't work on LLVM backend)
This commit is contained in:
drew
Andrew Kelley
parent
f33af8f071
commit
0249344a47
@ -19,7 +19,7 @@ test {
|
||||
_ = @import("behavior/bugs/4769_b.zig");
|
||||
_ = @import("behavior/bugs/6850.zig");
|
||||
_ = @import("behavior/call.zig");
|
||||
_ = @import("behavior/cast_c.zig");
|
||||
_ = @import("behavior/cast.zig");
|
||||
_ = @import("behavior/defer.zig");
|
||||
_ = @import("behavior/enum.zig");
|
||||
_ = @import("behavior/hasdecl.zig");
|
||||
@ -52,7 +52,7 @@ test {
|
||||
_ = @import("behavior/bugs/1741.zig");
|
||||
_ = @import("behavior/bugs/2006.zig");
|
||||
_ = @import("behavior/bugs/3112.zig");
|
||||
_ = @import("behavior/cast.zig");
|
||||
_ = @import("behavior/cast_llvm.zig");
|
||||
_ = @import("behavior/error.zig");
|
||||
_ = @import("behavior/eval.zig");
|
||||
_ = @import("behavior/floatop.zig");
|
||||
|
||||
@ -2,18 +2,95 @@ const std = @import("std");
|
||||
const expect = std.testing.expect;
|
||||
const mem = std.mem;
|
||||
const maxInt = std.math.maxInt;
|
||||
const native_endian = @import("builtin").target.cpu.arch.endian();
|
||||
|
||||
test "pointer reinterpret const float to int" {
|
||||
// The hex representation is 0x3fe3333333333303.
|
||||
const float: f64 = 5.99999999999994648725e-01;
|
||||
const float_ptr = &float;
|
||||
const int_ptr = @ptrCast(*const i32, float_ptr);
|
||||
const int_val = int_ptr.*;
|
||||
if (native_endian == .Little)
|
||||
try expect(int_val == 0x33333303)
|
||||
else
|
||||
try expect(int_val == 0x3fe33333);
|
||||
test "int to ptr cast" {
|
||||
const x = @as(usize, 13);
|
||||
const y = @intToPtr(*u8, x);
|
||||
const z = @ptrToInt(y);
|
||||
try expect(z == 13);
|
||||
}
|
||||
|
||||
test "integer literal to pointer cast" {
|
||||
const vga_mem = @intToPtr(*u16, 0xB8000);
|
||||
try expect(@ptrToInt(vga_mem) == 0xB8000);
|
||||
}
|
||||
|
||||
test "peer type resolution: ?T and T" {
|
||||
try expect(peerTypeTAndOptionalT(true, false).? == 0);
|
||||
try expect(peerTypeTAndOptionalT(false, false).? == 3);
|
||||
comptime {
|
||||
try expect(peerTypeTAndOptionalT(true, false).? == 0);
|
||||
try expect(peerTypeTAndOptionalT(false, false).? == 3);
|
||||
}
|
||||
}
|
||||
fn peerTypeTAndOptionalT(c: bool, b: bool) ?usize {
|
||||
if (c) {
|
||||
return if (b) null else @as(usize, 0);
|
||||
}
|
||||
|
||||
return @as(usize, 3);
|
||||
}
|
||||
|
||||
test "resolve undefined with integer" {
|
||||
try testResolveUndefWithInt(true, 1234);
|
||||
comptime try testResolveUndefWithInt(true, 1234);
|
||||
}
|
||||
fn testResolveUndefWithInt(b: bool, x: i32) !void {
|
||||
const value = if (b) x else undefined;
|
||||
if (b) {
|
||||
try expect(value == x);
|
||||
}
|
||||
}
|
||||
|
||||
test "@intCast i32 to u7" {
|
||||
var x: u128 = maxInt(u128);
|
||||
var y: i32 = 120;
|
||||
var z = x >> @intCast(u7, y);
|
||||
try expect(z == 0xff);
|
||||
}
|
||||
|
||||
test "@intCast to comptime_int" {
|
||||
try expect(@intCast(comptime_int, 0) == 0);
|
||||
}
|
||||
|
||||
test "implicit cast comptime numbers to any type when the value fits" {
|
||||
const a: u64 = 255;
|
||||
var b: u8 = a;
|
||||
try expect(b == 255);
|
||||
}
|
||||
|
||||
test "implicit cast comptime_int to comptime_float" {
|
||||
comptime try expect(@as(comptime_float, 10) == @as(f32, 10));
|
||||
try expect(2 == 2.0);
|
||||
}
|
||||
|
||||
test "comptime_int @intToFloat" {
|
||||
{
|
||||
const result = @intToFloat(f16, 1234);
|
||||
try expect(@TypeOf(result) == f16);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @intToFloat(f32, 1234);
|
||||
try expect(@TypeOf(result) == f32);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @intToFloat(f64, 1234);
|
||||
try expect(@TypeOf(result) == f64);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @intToFloat(f128, 1234);
|
||||
try expect(@TypeOf(result) == f128);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
// big comptime_int (> 64 bits) to f128 conversion
|
||||
{
|
||||
const result = @intToFloat(f128, 0x1_0000_0000_0000_0000);
|
||||
try expect(@TypeOf(result) == f128);
|
||||
try expect(result == 0x1_0000_0000_0000_0000.0);
|
||||
}
|
||||
}
|
||||
|
||||
test "@floatToInt" {
|
||||
@ -22,46 +99,162 @@ test "@floatToInt" {
|
||||
}
|
||||
|
||||
fn testFloatToInts() !void {
|
||||
try expectFloatToInt(f16, 255.1, u8, 255);
|
||||
try expectFloatToInt(f16, 127.2, i8, 127);
|
||||
try expectFloatToInt(f16, -128.2, i8, -128);
|
||||
const x = @as(i32, 1e4);
|
||||
try expect(x == 10000);
|
||||
const y = @floatToInt(i32, @as(f32, 1e4));
|
||||
try expect(y == 10000);
|
||||
try expectFloatToInt(f32, 255.1, u8, 255);
|
||||
try expectFloatToInt(f32, 127.2, i8, 127);
|
||||
try expectFloatToInt(f32, -128.2, i8, -128);
|
||||
}
|
||||
|
||||
fn expectFloatToInt(comptime F: type, f: F, comptime I: type, i: I) !void {
|
||||
try expect(@floatToInt(I, f) == i);
|
||||
}
|
||||
|
||||
test "implicit cast from [*]T to ?*c_void" {
|
||||
var a = [_]u8{ 3, 2, 1 };
|
||||
var runtime_zero: usize = 0;
|
||||
incrementVoidPtrArray(a[runtime_zero..].ptr, 3);
|
||||
try expect(std.mem.eql(u8, &a, &[_]u8{ 4, 3, 2 }));
|
||||
test "implicitly cast indirect pointer to maybe-indirect pointer" {
|
||||
const S = struct {
|
||||
const Self = @This();
|
||||
x: u8,
|
||||
fn constConst(p: *const *const Self) u8 {
|
||||
return p.*.x;
|
||||
}
|
||||
fn maybeConstConst(p: ?*const *const Self) u8 {
|
||||
return p.?.*.x;
|
||||
}
|
||||
fn constConstConst(p: *const *const *const Self) u8 {
|
||||
return p.*.*.x;
|
||||
}
|
||||
fn maybeConstConstConst(p: ?*const *const *const Self) u8 {
|
||||
return p.?.*.*.x;
|
||||
}
|
||||
};
|
||||
const s = S{ .x = 42 };
|
||||
const p = &s;
|
||||
const q = &p;
|
||||
const r = &q;
|
||||
try expect(42 == S.constConst(q));
|
||||
try expect(42 == S.maybeConstConst(q));
|
||||
try expect(42 == S.constConstConst(r));
|
||||
try expect(42 == S.maybeConstConstConst(r));
|
||||
}
|
||||
|
||||
fn incrementVoidPtrArray(array: ?*c_void, len: usize) void {
|
||||
var n: usize = 0;
|
||||
while (n < len) : (n += 1) {
|
||||
@ptrCast([*]u8, array.?)[n] += 1;
|
||||
test "@intCast comptime_int" {
|
||||
const result = @intCast(i32, 1234);
|
||||
try expect(@TypeOf(result) == i32);
|
||||
try expect(result == 1234);
|
||||
}
|
||||
|
||||
test "@floatCast comptime_int and comptime_float" {
|
||||
{
|
||||
const result = @floatCast(f16, 1234);
|
||||
try expect(@TypeOf(result) == f16);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @floatCast(f16, 1234.0);
|
||||
try expect(@TypeOf(result) == f16);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @floatCast(f32, 1234);
|
||||
try expect(@TypeOf(result) == f32);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @floatCast(f32, 1234.0);
|
||||
try expect(@TypeOf(result) == f32);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
}
|
||||
|
||||
test "compile time int to ptr of function" {
|
||||
try foobar(FUNCTION_CONSTANT);
|
||||
test "coerce undefined to optional" {
|
||||
try expect(MakeType(void).getNull() == null);
|
||||
try expect(MakeType(void).getNonNull() != null);
|
||||
}
|
||||
|
||||
pub const FUNCTION_CONSTANT = @intToPtr(PFN_void, maxInt(usize));
|
||||
pub const PFN_void = fn (*c_void) callconv(.C) void;
|
||||
fn MakeType(comptime T: type) type {
|
||||
return struct {
|
||||
fn getNull() ?T {
|
||||
return null;
|
||||
}
|
||||
|
||||
fn foobar(func: PFN_void) !void {
|
||||
try std.testing.expect(@ptrToInt(func) == maxInt(usize));
|
||||
fn getNonNull() ?T {
|
||||
return @as(T, undefined);
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
test "implicit ptr to *c_void" {
|
||||
var a: u32 = 1;
|
||||
var ptr: *align(@alignOf(u32)) c_void = &a;
|
||||
var b: *u32 = @ptrCast(*u32, ptr);
|
||||
try expect(b.* == 1);
|
||||
var ptr2: ?*align(@alignOf(u32)) c_void = &a;
|
||||
var c: *u32 = @ptrCast(*u32, ptr2.?);
|
||||
try expect(c.* == 1);
|
||||
test "implicit cast from *[N]T to [*c]T" {
|
||||
var x: [4]u16 = [4]u16{ 0, 1, 2, 3 };
|
||||
var y: [*c]u16 = &x;
|
||||
|
||||
try expect(std.mem.eql(u16, x[0..4], y[0..4]));
|
||||
x[0] = 8;
|
||||
y[3] = 6;
|
||||
try expect(std.mem.eql(u16, x[0..4], y[0..4]));
|
||||
}
|
||||
|
||||
test "*usize to *void" {
|
||||
var i = @as(usize, 0);
|
||||
var v = @ptrCast(*void, &i);
|
||||
v.* = {};
|
||||
}
|
||||
|
||||
test "@intToEnum passed a comptime_int to an enum with one item" {
|
||||
const E = enum { A };
|
||||
const x = @intToEnum(E, 0);
|
||||
try expect(x == E.A);
|
||||
}
|
||||
|
||||
test "@intCast to u0 and use the result" {
|
||||
const S = struct {
|
||||
fn doTheTest(zero: u1, one: u1, bigzero: i32) !void {
|
||||
try expect((one << @intCast(u0, bigzero)) == 1);
|
||||
try expect((zero << @intCast(u0, bigzero)) == 0);
|
||||
}
|
||||
};
|
||||
try S.doTheTest(0, 1, 0);
|
||||
comptime try S.doTheTest(0, 1, 0);
|
||||
}
|
||||
|
||||
test "peer result null and comptime_int" {
|
||||
const S = struct {
|
||||
fn blah(n: i32) ?i32 {
|
||||
if (n == 0) {
|
||||
return null;
|
||||
} else if (n < 0) {
|
||||
return -1;
|
||||
} else {
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
try expect(S.blah(0) == null);
|
||||
comptime try expect(S.blah(0) == null);
|
||||
try expect(S.blah(10).? == 1);
|
||||
comptime try expect(S.blah(10).? == 1);
|
||||
try expect(S.blah(-10).? == -1);
|
||||
comptime try expect(S.blah(-10).? == -1);
|
||||
}
|
||||
|
||||
test "*const ?[*]const T to [*c]const [*c]const T" {
|
||||
var array = [_]u8{ 'o', 'k' };
|
||||
const opt_array_ptr: ?[*]const u8 = &array;
|
||||
const a: *const ?[*]const u8 = &opt_array_ptr;
|
||||
const b: [*c]const [*c]const u8 = a;
|
||||
try expect(b.*[0] == 'o');
|
||||
try expect(b[0][1] == 'k');
|
||||
}
|
||||
|
||||
test "array coersion to undefined at runtime" {
|
||||
@setRuntimeSafety(true);
|
||||
|
||||
var array = [4]u8{ 3, 4, 5, 6 };
|
||||
var undefined_val = [4]u8{ 0xAA, 0xAA, 0xAA, 0xAA };
|
||||
|
||||
try expect(std.mem.eql(u8, &array, &array));
|
||||
array = undefined;
|
||||
try expect(std.mem.eql(u8, &array, &undefined_val));
|
||||
}
|
||||
|
||||
@ -1,260 +0,0 @@
|
||||
const std = @import("std");
|
||||
const expect = std.testing.expect;
|
||||
const mem = std.mem;
|
||||
const maxInt = std.math.maxInt;
|
||||
|
||||
test "int to ptr cast" {
|
||||
const x = @as(usize, 13);
|
||||
const y = @intToPtr(*u8, x);
|
||||
const z = @ptrToInt(y);
|
||||
try expect(z == 13);
|
||||
}
|
||||
|
||||
test "integer literal to pointer cast" {
|
||||
const vga_mem = @intToPtr(*u16, 0xB8000);
|
||||
try expect(@ptrToInt(vga_mem) == 0xB8000);
|
||||
}
|
||||
|
||||
test "peer type resolution: ?T and T" {
|
||||
try expect(peerTypeTAndOptionalT(true, false).? == 0);
|
||||
try expect(peerTypeTAndOptionalT(false, false).? == 3);
|
||||
comptime {
|
||||
try expect(peerTypeTAndOptionalT(true, false).? == 0);
|
||||
try expect(peerTypeTAndOptionalT(false, false).? == 3);
|
||||
}
|
||||
}
|
||||
fn peerTypeTAndOptionalT(c: bool, b: bool) ?usize {
|
||||
if (c) {
|
||||
return if (b) null else @as(usize, 0);
|
||||
}
|
||||
|
||||
return @as(usize, 3);
|
||||
}
|
||||
|
||||
test "resolve undefined with integer" {
|
||||
try testResolveUndefWithInt(true, 1234);
|
||||
comptime try testResolveUndefWithInt(true, 1234);
|
||||
}
|
||||
fn testResolveUndefWithInt(b: bool, x: i32) !void {
|
||||
const value = if (b) x else undefined;
|
||||
if (b) {
|
||||
try expect(value == x);
|
||||
}
|
||||
}
|
||||
|
||||
test "@intCast i32 to u7" {
|
||||
var x: u128 = maxInt(u128);
|
||||
var y: i32 = 120;
|
||||
var z = x >> @intCast(u7, y);
|
||||
try expect(z == 0xff);
|
||||
}
|
||||
|
||||
test "@intCast to comptime_int" {
|
||||
try expect(@intCast(comptime_int, 0) == 0);
|
||||
}
|
||||
|
||||
test "implicit cast comptime numbers to any type when the value fits" {
|
||||
const a: u64 = 255;
|
||||
var b: u8 = a;
|
||||
try expect(b == 255);
|
||||
}
|
||||
|
||||
test "implicit cast comptime_int to comptime_float" {
|
||||
comptime try expect(@as(comptime_float, 10) == @as(f32, 10));
|
||||
try expect(2 == 2.0);
|
||||
}
|
||||
|
||||
test "comptime_int @intToFloat" {
|
||||
{
|
||||
const result = @intToFloat(f16, 1234);
|
||||
try expect(@TypeOf(result) == f16);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @intToFloat(f32, 1234);
|
||||
try expect(@TypeOf(result) == f32);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @intToFloat(f64, 1234);
|
||||
try expect(@TypeOf(result) == f64);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @intToFloat(f128, 1234);
|
||||
try expect(@TypeOf(result) == f128);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
// big comptime_int (> 64 bits) to f128 conversion
|
||||
{
|
||||
const result = @intToFloat(f128, 0x1_0000_0000_0000_0000);
|
||||
try expect(@TypeOf(result) == f128);
|
||||
try expect(result == 0x1_0000_0000_0000_0000.0);
|
||||
}
|
||||
}
|
||||
|
||||
test "@floatToInt" {
|
||||
try testFloatToInts();
|
||||
comptime try testFloatToInts();
|
||||
}
|
||||
|
||||
fn testFloatToInts() !void {
|
||||
const x = @as(i32, 1e4);
|
||||
try expect(x == 10000);
|
||||
const y = @floatToInt(i32, @as(f32, 1e4));
|
||||
try expect(y == 10000);
|
||||
try expectFloatToInt(f32, 255.1, u8, 255);
|
||||
try expectFloatToInt(f32, 127.2, i8, 127);
|
||||
try expectFloatToInt(f32, -128.2, i8, -128);
|
||||
}
|
||||
|
||||
fn expectFloatToInt(comptime F: type, f: F, comptime I: type, i: I) !void {
|
||||
try expect(@floatToInt(I, f) == i);
|
||||
}
|
||||
|
||||
test "implicitly cast indirect pointer to maybe-indirect pointer" {
|
||||
const S = struct {
|
||||
const Self = @This();
|
||||
x: u8,
|
||||
fn constConst(p: *const *const Self) u8 {
|
||||
return p.*.x;
|
||||
}
|
||||
fn maybeConstConst(p: ?*const *const Self) u8 {
|
||||
return p.?.*.x;
|
||||
}
|
||||
fn constConstConst(p: *const *const *const Self) u8 {
|
||||
return p.*.*.x;
|
||||
}
|
||||
fn maybeConstConstConst(p: ?*const *const *const Self) u8 {
|
||||
return p.?.*.*.x;
|
||||
}
|
||||
};
|
||||
const s = S{ .x = 42 };
|
||||
const p = &s;
|
||||
const q = &p;
|
||||
const r = &q;
|
||||
try expect(42 == S.constConst(q));
|
||||
try expect(42 == S.maybeConstConst(q));
|
||||
try expect(42 == S.constConstConst(r));
|
||||
try expect(42 == S.maybeConstConstConst(r));
|
||||
}
|
||||
|
||||
test "@intCast comptime_int" {
|
||||
const result = @intCast(i32, 1234);
|
||||
try expect(@TypeOf(result) == i32);
|
||||
try expect(result == 1234);
|
||||
}
|
||||
|
||||
test "@floatCast comptime_int and comptime_float" {
|
||||
{
|
||||
const result = @floatCast(f16, 1234);
|
||||
try expect(@TypeOf(result) == f16);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @floatCast(f16, 1234.0);
|
||||
try expect(@TypeOf(result) == f16);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @floatCast(f32, 1234);
|
||||
try expect(@TypeOf(result) == f32);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
{
|
||||
const result = @floatCast(f32, 1234.0);
|
||||
try expect(@TypeOf(result) == f32);
|
||||
try expect(result == 1234.0);
|
||||
}
|
||||
}
|
||||
|
||||
test "coerce undefined to optional" {
|
||||
try expect(MakeType(void).getNull() == null);
|
||||
try expect(MakeType(void).getNonNull() != null);
|
||||
}
|
||||
|
||||
fn MakeType(comptime T: type) type {
|
||||
return struct {
|
||||
fn getNull() ?T {
|
||||
return null;
|
||||
}
|
||||
|
||||
fn getNonNull() ?T {
|
||||
return @as(T, undefined);
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
test "implicit cast from *[N]T to [*c]T" {
|
||||
var x: [4]u16 = [4]u16{ 0, 1, 2, 3 };
|
||||
var y: [*c]u16 = &x;
|
||||
|
||||
try expect(std.mem.eql(u16, x[0..4], y[0..4]));
|
||||
x[0] = 8;
|
||||
y[3] = 6;
|
||||
try expect(std.mem.eql(u16, x[0..4], y[0..4]));
|
||||
}
|
||||
|
||||
test "*usize to *void" {
|
||||
var i = @as(usize, 0);
|
||||
var v = @ptrCast(*void, &i);
|
||||
v.* = {};
|
||||
}
|
||||
|
||||
test "@intToEnum passed a comptime_int to an enum with one item" {
|
||||
const E = enum { A };
|
||||
const x = @intToEnum(E, 0);
|
||||
try expect(x == E.A);
|
||||
}
|
||||
|
||||
test "@intCast to u0 and use the result" {
|
||||
const S = struct {
|
||||
fn doTheTest(zero: u1, one: u1, bigzero: i32) !void {
|
||||
try expect((one << @intCast(u0, bigzero)) == 1);
|
||||
try expect((zero << @intCast(u0, bigzero)) == 0);
|
||||
}
|
||||
};
|
||||
try S.doTheTest(0, 1, 0);
|
||||
comptime try S.doTheTest(0, 1, 0);
|
||||
}
|
||||
|
||||
test "peer result null and comptime_int" {
|
||||
const S = struct {
|
||||
fn blah(n: i32) ?i32 {
|
||||
if (n == 0) {
|
||||
return null;
|
||||
} else if (n < 0) {
|
||||
return -1;
|
||||
} else {
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
try expect(S.blah(0) == null);
|
||||
comptime try expect(S.blah(0) == null);
|
||||
try expect(S.blah(10).? == 1);
|
||||
comptime try expect(S.blah(10).? == 1);
|
||||
try expect(S.blah(-10).? == -1);
|
||||
comptime try expect(S.blah(-10).? == -1);
|
||||
}
|
||||
|
||||
test "*const ?[*]const T to [*c]const [*c]const T" {
|
||||
var array = [_]u8{ 'o', 'k' };
|
||||
const opt_array_ptr: ?[*]const u8 = &array;
|
||||
const a: *const ?[*]const u8 = &opt_array_ptr;
|
||||
const b: [*c]const [*c]const u8 = a;
|
||||
try expect(b.*[0] == 'o');
|
||||
try expect(b[0][1] == 'k');
|
||||
}
|
||||
|
||||
test "array coersion to undefined at runtime" {
|
||||
@setRuntimeSafety(true);
|
||||
|
||||
var array = [4]u8{ 3, 4, 5, 6 };
|
||||
var undefined_val = [4]u8{ 0xAA, 0xAA, 0xAA, 0xAA };
|
||||
|
||||
try expect(std.mem.eql(u8, &array, &array));
|
||||
array = undefined;
|
||||
try expect(std.mem.eql(u8, &array, &undefined_val));
|
||||
}
|
||||
67
test/behavior/cast_llvm.zig
Normal file
67
test/behavior/cast_llvm.zig
Normal file
@ -0,0 +1,67 @@
|
||||
const std = @import("std");
|
||||
const expect = std.testing.expect;
|
||||
const mem = std.mem;
|
||||
const maxInt = std.math.maxInt;
|
||||
const native_endian = @import("builtin").target.cpu.arch.endian();
|
||||
|
||||
test "pointer reinterpret const float to int" {
|
||||
// The hex representation is 0x3fe3333333333303.
|
||||
const float: f64 = 5.99999999999994648725e-01;
|
||||
const float_ptr = &float;
|
||||
const int_ptr = @ptrCast(*const i32, float_ptr);
|
||||
const int_val = int_ptr.*;
|
||||
if (native_endian == .Little)
|
||||
try expect(int_val == 0x33333303)
|
||||
else
|
||||
try expect(int_val == 0x3fe33333);
|
||||
}
|
||||
|
||||
test "@floatToInt" {
|
||||
try testFloatToInts();
|
||||
comptime try testFloatToInts();
|
||||
}
|
||||
|
||||
fn testFloatToInts() !void {
|
||||
try expectFloatToInt(f16, 255.1, u8, 255);
|
||||
try expectFloatToInt(f16, 127.2, i8, 127);
|
||||
try expectFloatToInt(f16, -128.2, i8, -128);
|
||||
}
|
||||
|
||||
fn expectFloatToInt(comptime F: type, f: F, comptime I: type, i: I) !void {
|
||||
try expect(@floatToInt(I, f) == i);
|
||||
}
|
||||
|
||||
test "implicit cast from [*]T to ?*c_void" {
|
||||
var a = [_]u8{ 3, 2, 1 };
|
||||
var runtime_zero: usize = 0;
|
||||
incrementVoidPtrArray(a[runtime_zero..].ptr, 3);
|
||||
try expect(std.mem.eql(u8, &a, &[_]u8{ 4, 3, 2 }));
|
||||
}
|
||||
|
||||
fn incrementVoidPtrArray(array: ?*c_void, len: usize) void {
|
||||
var n: usize = 0;
|
||||
while (n < len) : (n += 1) {
|
||||
@ptrCast([*]u8, array.?)[n] += 1;
|
||||
}
|
||||
}
|
||||
|
||||
test "compile time int to ptr of function" {
|
||||
try foobar(FUNCTION_CONSTANT);
|
||||
}
|
||||
|
||||
pub const FUNCTION_CONSTANT = @intToPtr(PFN_void, maxInt(usize));
|
||||
pub const PFN_void = fn (*c_void) callconv(.C) void;
|
||||
|
||||
fn foobar(func: PFN_void) !void {
|
||||
try std.testing.expect(@ptrToInt(func) == maxInt(usize));
|
||||
}
|
||||
|
||||
test "implicit ptr to *c_void" {
|
||||
var a: u32 = 1;
|
||||
var ptr: *align(@alignOf(u32)) c_void = &a;
|
||||
var b: *u32 = @ptrCast(*u32, ptr);
|
||||
try expect(b.* == 1);
|
||||
var ptr2: ?*align(@alignOf(u32)) c_void = &a;
|
||||
var c: *u32 = @ptrCast(*u32, ptr2.?);
|
||||
try expect(c.* == 1);
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user