Commit 9bf1681990
Changed files (6)
src
codegen
test
src/codegen/c.zig
@@ -226,6 +226,36 @@ pub const DeclGen = struct {
try dg.renderDeclName(decl, writer);
}
+ /// Assumes that int_val is an int greater than maxInt(u64) and has > 64 and <= 128 bits.
+ fn renderBigInt(
+ writer: anytype,
+ int_val: anytype,
+ ) error{ OutOfMemory, AnalysisFail }!void {
+ const int_info = @typeInfo(@TypeOf(int_val)).Int;
+ const is_signed = int_info.signedness == .signed;
+ const is_neg = int_val < 0;
+ comptime assert(int_info.bits > 64 and int_info.bits <= 128);
+
+ // Clang and GCC don't support 128-bit integer constants but will hopefully unfold them
+ // if we construct one manually.
+ const magnitude = std.math.absCast(int_val);
+
+ const high = @truncate(u64, magnitude >> 64);
+ const low = @truncate(u64, magnitude);
+
+ // (int128_t)/<->( ( (uint128_t)( val_high << 64 )u ) + (uint128_t)val_low/u )
+ if (is_signed) try writer.writeAll("(int128_t)");
+ if (is_neg) try writer.writeByte('-');
+
+ assert(high > 0);
+ try writer.print("(((uint128_t)0x{x}u<<64)", .{ high });
+
+ if (low > 0)
+ try writer.print("+(uint128_t)0x{x}u", .{ low });
+
+ return writer.writeByte(')');
+ }
+
fn renderValue(
dg: *DeclGen,
writer: anytype,
@@ -240,18 +270,18 @@ pub const DeclGen = struct {
const c_bits = toCIntBits(ty.intInfo(dg.module.getTarget()).bits) orelse
return dg.fail("TODO: C backend: implement integer types larger than 128 bits", .{});
switch (c_bits) {
- 8 => return writer.writeAll("0xaaU"),
- 16 => return writer.writeAll("0xaaaaU"),
- 32 => return writer.writeAll("0xaaaaaaaaU"),
- 64 => return writer.writeAll("0xaaaaaaaaaaaaaaaaUL"),
- 128 => return writer.writeAll("0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaULL"),
+ 8 => return writer.writeAll("0xaau"),
+ 16 => return writer.writeAll("0xaaaau"),
+ 32 => return writer.writeAll("0xaaaaaaaau"),
+ 64 => return writer.writeAll("0xaaaaaaaaaaaaaaaau"),
+ 128 => return renderBigInt(writer, @as(u128, 0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)),
else => unreachable,
}
},
.Float => {
switch (ty.floatBits(dg.module.getTarget())) {
- 32 => return writer.writeAll("zig_bitcast_f32_u32(0xaaaaaaaa)"),
- 64 => return writer.writeAll("zig_bitcast_f64_u64(0xaaaaaaaaaaaaaaaa)"),
+ 32 => return writer.writeAll("zig_bitcast_f32_u32(0xaaaaaaaau)"),
+ 64 => return writer.writeAll("zig_bitcast_f64_u64(0xaaaaaaaaaaaaaaaau)"),
else => return dg.fail("TODO float types > 64 bits are not support in renderValue() as of now", .{}),
}
},
@@ -265,10 +295,18 @@ pub const DeclGen = struct {
}
}
switch (ty.zigTypeTag()) {
- .Int => {
- if (ty.isSignedInt())
- return writer.print("{d}", .{val.toSignedInt()});
- return writer.print("{d}", .{val.toUnsignedInt()});
+ .Int => switch (val.tag()) {
+ .int_big_positive => try renderBigInt(writer, val.castTag(.int_big_positive).?.asBigInt().to(u128) catch {
+ return dg.fail("TODO implement integer constants larger than 128 bits", .{});
+ }),
+ .int_big_negative => try renderBigInt(writer, val.castTag(.int_big_negative).?.asBigInt().to(i128) catch {
+ return dg.fail("TODO implement integer constants larger than 128 bits", .{});
+ }),
+ else => {
+ if (ty.isSignedInt())
+ return writer.print("{d}", .{val.toSignedInt()});
+ return writer.print("{d}u", .{val.toUnsignedInt()});
+ }
},
.Float => {
if (ty.floatBits(dg.module.getTarget()) <= 64) {
@@ -286,8 +324,17 @@ pub const DeclGen = struct {
return dg.fail("TODO: C backend: implement lowering large float values", .{});
},
.Pointer => switch (val.tag()) {
- .null_value, .zero => try writer.writeAll("NULL"),
- .one => try writer.writeAll("1"),
+ .null_value => try writer.writeAll("NULL"),
+ // Technically this should produce NULL but the integer literal 0 will always coerce
+ // to the assigned pointer type. Note this is just a hack to fix warnings from ordered comparisons (<, >, etc)
+ // between pointers and 0, which is an extension to begin with.
+ .zero => try writer.writeByte('0'),
+ .one => {
+ // int constants like 1 will not cast to the pointer however.
+ try writer.writeAll("((");
+ try dg.renderType(writer, ty);
+ return writer.writeAll(")1)");
+ },
.decl_ref => {
const decl = val.castTag(.decl_ref).?.data;
return dg.renderDeclValue(writer, ty, val, decl);
@@ -316,6 +363,11 @@ pub const DeclGen = struct {
const decl = val.castTag(.extern_fn).?.data;
try dg.renderDeclName(decl, writer);
},
+ .int_u64 => {
+ try writer.writeAll("((");
+ try dg.renderType(writer, ty);
+ try writer.print(")0x{x}u)", .{val.toUnsignedInt()});
+ },
else => unreachable,
},
.Array => {
@@ -728,6 +780,8 @@ pub const DeclGen = struct {
.i32 => try w.writeAll("int32_t"),
.u64 => try w.writeAll("uint64_t"),
.i64 => try w.writeAll("int64_t"),
+ .u128 => try w.writeAll("uint128_t"),
+ .i128 => try w.writeAll("int128_t"),
.usize => try w.writeAll("uintptr_t"),
.isize => try w.writeAll("intptr_t"),
.c_short => try w.writeAll("short"),
@@ -787,8 +841,9 @@ pub const DeclGen = struct {
},
.Array => {
// We are referencing the array so it will decay to a C pointer.
- try dg.renderType(w, t.elemType());
- return w.writeAll(" *");
+ // NB: arrays are not really types in C so they are either specified in the declaration
+ // or are already pointed to; our only job is to render the element's type.
+ return dg.renderType(w, t.elemType());
},
.Optional => {
var opt_buf: Type.Payload.ElemType = undefined;
@@ -1068,12 +1123,15 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
.unreach => try airUnreach(f),
.fence => try airFence(f, inst),
+ .ptr_add => try airPtrAddSub (f, inst, " + "),
+ .ptr_sub => try airPtrAddSub (f, inst, " - "),
+
// TODO use a different strategy for add that communicates to the optimizer
// that wrapping is UB.
- .add, .ptr_add => try airBinOp (f, inst, " + "),
+ .add => try airBinOp (f, inst, " + "),
// TODO use a different strategy for sub that communicates to the optimizer
// that wrapping is UB.
- .sub, .ptr_sub => try airBinOp (f, inst, " - "),
+ .sub => try airBinOp (f, inst, " - "),
// TODO use a different strategy for mul that communicates to the optimizer
// that wrapping is UB.
.mul => try airBinOp (f, inst, " * "),
@@ -1187,7 +1245,7 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
.ptr_slice_len_ptr => try airPtrSliceFieldPtr(f, inst, ".len;\n"),
.ptr_slice_ptr_ptr => try airPtrSliceFieldPtr(f, inst, ".ptr;\n"),
- .ptr_elem_val => try airPtrElemVal(f, inst, "["),
+ .ptr_elem_val => try airPtrElemVal(f, inst),
.ptr_elem_ptr => try airPtrElemPtr(f, inst),
.slice_elem_val => try airSliceElemVal(f, inst),
.slice_elem_ptr => try airSliceElemPtr(f, inst),
@@ -1240,20 +1298,39 @@ fn airPtrSliceFieldPtr(f: *Function, inst: Air.Inst.Index, suffix: []const u8) !
return f.fail("TODO: C backend: airPtrSliceFieldPtr", .{});
}
-fn airPtrElemVal(f: *Function, inst: Air.Inst.Index, prefix: []const u8) !CValue {
- const is_volatile = false; // TODO
- if (!is_volatile and f.liveness.isUnused(inst))
- return CValue.none;
+fn airPtrElemVal(f: *Function, inst: Air.Inst.Index) !CValue {
+ const bin_op = f.air.instructions.items(.data)[inst].bin_op;
+ const slice_ty = f.air.typeOf(bin_op.lhs);
+ if (!slice_ty.isVolatilePtr() and f.liveness.isUnused(inst)) return CValue.none;
- _ = prefix;
- return f.fail("TODO: C backend: airPtrElemVal", .{});
+ const arr = try f.resolveInst(bin_op.lhs);
+ const index = try f.resolveInst(bin_op.rhs);
+ const writer = f.object.writer();
+ const local = try f.allocLocal(f.air.typeOfIndex(inst), .Const);
+ try writer.writeAll(" = ");
+ try f.writeCValue(writer, arr);
+ try writer.writeByte('[');
+ try f.writeCValue(writer, index);
+ try writer.writeAll("];\n");
+ return local;
}
fn airPtrElemPtr(f: *Function, inst: Air.Inst.Index) !CValue {
- if (f.liveness.isUnused(inst))
- return CValue.none;
+ if (f.liveness.isUnused(inst)) return CValue.none;
- return f.fail("TODO: C backend: airPtrElemPtr", .{});
+ const ty_pl = f.air.instructions.items(.data)[inst].ty_pl;
+ const bin_op = f.air.extraData(Air.Bin, ty_pl.payload).data;
+
+ const arr = try f.resolveInst(bin_op.lhs);
+ const index = try f.resolveInst(bin_op.rhs);
+ const writer = f.object.writer();
+ const local = try f.allocLocal(f.air.typeOfIndex(inst), .Const);
+ try writer.writeAll(" = &");
+ try f.writeCValue(writer, arr);
+ try writer.writeByte('[');
+ try f.writeCValue(writer, index);
+ try writer.writeAll("];\n");
+ return local;
}
fn airSliceElemVal(f: *Function, inst: Air.Inst.Index) !CValue {
@@ -1317,6 +1394,10 @@ fn airAlloc(f: *Function, inst: Air.Inst.Index) !CValue {
const local = try f.allocLocal(elem_type, mutability);
try writer.writeAll(";\n");
+ // Arrays are already pointers so they don't need to be referenced.
+ if (elem_type.zigTypeTag() == .Array)
+ return CValue{ .local = local.local };
+
return CValue{ .local_ref = local.local };
}
@@ -1810,6 +1891,33 @@ fn airBinOp(f: *Function, inst: Air.Inst.Index, operator: [*:0]const u8) !CValue
return local;
}
+fn airPtrAddSub(f: *Function, inst: Air.Inst.Index, operator: [*:0]const u8) !CValue {
+ if (f.liveness.isUnused(inst))
+ return CValue.none;
+
+ const bin_op = f.air.instructions.items(.data)[inst].bin_op;
+ const lhs = try f.resolveInst(bin_op.lhs);
+ const rhs = try f.resolveInst(bin_op.rhs);
+
+ const writer = f.object.writer();
+ const inst_ty = f.air.typeOfIndex(inst);
+ const local = try f.allocLocal(inst_ty, .Const);
+
+ // We must convert to and from integer types to prevent UB if the operation results in a NULL pointer,
+ // or if LHS is NULL. The operation is only UB if the result is NULL and then dereferenced.
+ try writer.writeAll(" = (");
+ try f.renderType(writer, inst_ty);
+ try writer.writeAll(")(((uintptr_t)");
+ try f.writeCValue(writer, lhs);
+ try writer.print("){s}(", .{operator});
+ try f.writeCValue(writer, rhs);
+ try writer.writeAll("*sizeof(");
+ try f.renderType(writer, inst_ty.childType());
+ try writer.print(")));\n", .{});
+
+ return local;
+}
+
fn airMinMax(f: *Function, inst: Air.Inst.Index, operator: [*:0]const u8) !CValue {
if (f.liveness.isUnused(inst)) return CValue.none;
@@ -2529,7 +2637,9 @@ fn airPtrToInt(f: *Function, inst: Air.Inst.Index) !CValue {
const writer = f.object.writer();
const operand = try f.resolveInst(un_op);
- try writer.writeAll(" = ");
+ try writer.writeAll(" = (");
+ try f.renderType(writer, inst_ty);
+ try writer.writeAll(")");
try f.writeCValue(writer, operand);
try writer.writeAll(";\n");
return local;
test/behavior/cast.zig
@@ -2,70 +2,8 @@ const std = @import("std");
const expect = std.testing.expect;
const mem = std.mem;
const maxInt = std.math.maxInt;
-const Vector = std.meta.Vector;
const native_endian = @import("builtin").target.cpu.arch.endian();
-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 "pointer reinterpret const float to int" {
// The hex representation is 0x3fe3333333333303.
const float: f64 = 5.99999999999994648725e-01;
@@ -78,51 +16,15 @@ test "pointer reinterpret const float to int" {
try expect(int_val == 0x3fe33333);
}
-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(f16, 255.1, u8, 255);
try expectFloatToInt(f16, 127.2, i8, 127);
try expectFloatToInt(f16, -128.2, i8, -128);
- 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 {
@@ -143,95 +45,6 @@ fn incrementVoidPtrArray(array: ?*c_void, len: usize) void {
}
}
-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 "compile time int to ptr of function" {
try foobar(FUNCTION_CONSTANT);
}
@@ -252,50 +65,3 @@ test "implicit ptr to *c_void" {
var c: *u32 = @ptrCast(*u32, ptr2.?);
try expect(c.* == 1);
}
-
-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/behavior/cast_c.zig
@@ -0,0 +1,249 @@
+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/behavior/int128.zig
@@ -0,0 +1,43 @@
+const std = @import("std");
+const expect = std.testing.expect;
+const maxInt = std.math.maxInt;
+const minInt = std.math.minInt;
+
+test "uint128" {
+ var buff: u128 = maxInt(u128);
+ try expect(buff == maxInt(u128));
+
+ const magic_const = 0x12341234123412341234123412341234;
+ buff = magic_const;
+
+ try expect(buff == magic_const);
+ try expect(magic_const == 0x12341234123412341234123412341234);
+
+ buff = 0;
+ try expect(buff == @as(u128, 0));
+}
+
+test "undefined 128 bit int" {
+ @setRuntimeSafety(true);
+
+ var undef: u128 = undefined;
+ var undef_signed: i128 = undefined;
+ try expect(undef == 0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa and @bitCast(u128, undef_signed) == undef);
+}
+
+test "int128" {
+ var buff: i128 = -1;
+ try expect(buff < 0 and (buff + 1) == 0);
+ try expect(@intCast(i8, buff) == @as(i8, -1));
+
+ buff = minInt(i128);
+ try expect(buff < 0);
+
+ // This should be uncommented once wrapping arithmetic is implemented for 128 bit ints:
+ // try expect(buff < 0 and (buff -% 1) > 0)
+}
+
+test "truncate int128" {
+ var buff: u128 = maxInt(u128);
+ try expect(@truncate(u64, buff) == maxInt(u64));
+}
\ No newline at end of file
test/behavior/pointers.zig
@@ -61,12 +61,16 @@ test "initialize const optional C pointer to null" {
test "assigning integer to C pointer" {
var x: i32 = 0;
+ var y: i32 = 1;
var ptr: [*c]u8 = 0;
var ptr2: [*c]u8 = x;
- if (false) {
- ptr;
- ptr2;
- }
+ var ptr3: [*c]u8 = 1;
+ var ptr4: [*c]u8 = y;
+
+ try expect(ptr == ptr2);
+ try expect(ptr3 == ptr4);
+ try expect(ptr3 > ptr and ptr4 > ptr2 and y > x);
+ try expect(1 > ptr and y > ptr2 and 0 < ptr3 and x < ptr4);
}
test "C pointer comparison and arithmetic" {
test/behavior.zig
@@ -2,6 +2,7 @@ const builtin = @import("builtin");
test {
// Tests that pass for stage1, stage2, and the C backend.
+ _ = @import("behavior/align.zig");
_ = @import("behavior/basic.zig");
_ = @import("behavior/bitcast.zig");
_ = @import("behavior/bool.zig");
@@ -19,16 +20,18 @@ test {
_ = @import("behavior/bugs/4769_b.zig");
_ = @import("behavior/bugs/6850.zig");
_ = @import("behavior/call.zig");
+ _ = @import("behavior/cast_c.zig");
_ = @import("behavior/defer.zig");
_ = @import("behavior/enum.zig");
_ = @import("behavior/hasdecl.zig");
_ = @import("behavior/hasfield.zig");
_ = @import("behavior/if.zig");
- _ = @import("behavior/struct.zig");
- _ = @import("behavior/truncate.zig");
+ _ = @import("behavior/int128.zig");
_ = @import("behavior/null.zig");
+ _ = @import("behavior/pointers.zig");
_ = @import("behavior/ptrcast.zig");
_ = @import("behavior/pub_enum.zig");
+ _ = @import("behavior/struct.zig");
_ = @import("behavior/truncate.zig");
_ = @import("behavior/underscore.zig");
_ = @import("behavior/usingnamespace.zig");
@@ -39,7 +42,6 @@ test {
if (builtin.object_format != .c) {
// Tests that pass for stage1 and stage2 but not the C backend.
- _ = @import("behavior/align.zig");
_ = @import("behavior/array.zig");
_ = @import("behavior/atomics.zig");
_ = @import("behavior/basic_llvm.zig");
@@ -60,7 +62,6 @@ test {
_ = @import("behavior/maximum_minimum.zig");
_ = @import("behavior/null_llvm.zig");
_ = @import("behavior/optional.zig");
- _ = @import("behavior/pointers.zig");
_ = @import("behavior/popcount.zig");
_ = @import("behavior/saturating_arithmetic.zig");
_ = @import("behavior/sizeof_and_typeof.zig");