mirror of
https://github.com/ziglang/zig.git
synced 2026-02-05 22:16:58 +00:00
C backend: basic big ints, fix airPtrToInt, array references, pointer arithmetic UB with NULL, implement airPtrElemPtr/Val, fix redundant indirection/references with arrays
-add additional test cases that were found to be passing -add basic int128 test cases which previously did not pass but weren't covered -most test cases in cast.zig now pass -i128/u128 or smaller int constants can now be rendered -unsigned int constants are now always suffixed with 'u' to prevent random compile errors -pointers with a val tag of 'zero' now just emit a 0 constant which coerces to the pointer type and fixes some warnings with ordered comparisons -pointers with a val tag of 'one' are now casted back to the pointer type -support pointers with a u64 val -fix bug where rendering an array's type will emit more indirection than is needed -render uint128_t/int128_t manually when needed -implement ptr_add/sub AIR handlers manually so they manually cast to int types which avoids UB if the result or ptr operand is NULL -implement airPtrElemVal/Ptr -airAlloc for arrays will not allocate a ref as the local for the array is already a reference/pointer to the array itself -fix airPtrToInt by casting to the int type
This commit is contained in:
drew
Andrew Kelley
parent
952d865bd2
commit
9bf1681990
@ -226,6 +226,36 @@ pub const DeclGen = struct {
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try dg.renderDeclName(decl, writer);
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}
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/// Assumes that int_val is an int greater than maxInt(u64) and has > 64 and <= 128 bits.
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fn renderBigInt(
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writer: anytype,
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int_val: anytype,
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) error{ OutOfMemory, AnalysisFail }!void {
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const int_info = @typeInfo(@TypeOf(int_val)).Int;
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const is_signed = int_info.signedness == .signed;
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const is_neg = int_val < 0;
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comptime assert(int_info.bits > 64 and int_info.bits <= 128);
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// Clang and GCC don't support 128-bit integer constants but will hopefully unfold them
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// if we construct one manually.
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const magnitude = std.math.absCast(int_val);
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const high = @truncate(u64, magnitude >> 64);
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const low = @truncate(u64, magnitude);
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// (int128_t)/<->( ( (uint128_t)( val_high << 64 )u ) + (uint128_t)val_low/u )
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if (is_signed) try writer.writeAll("(int128_t)");
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if (is_neg) try writer.writeByte('-');
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assert(high > 0);
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try writer.print("(((uint128_t)0x{x}u<<64)", .{ high });
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if (low > 0)
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try writer.print("+(uint128_t)0x{x}u", .{ low });
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return writer.writeByte(')');
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}
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fn renderValue(
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dg: *DeclGen,
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writer: anytype,
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@ -240,18 +270,18 @@ pub const DeclGen = struct {
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const c_bits = toCIntBits(ty.intInfo(dg.module.getTarget()).bits) orelse
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return dg.fail("TODO: C backend: implement integer types larger than 128 bits", .{});
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switch (c_bits) {
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8 => return writer.writeAll("0xaaU"),
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16 => return writer.writeAll("0xaaaaU"),
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32 => return writer.writeAll("0xaaaaaaaaU"),
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64 => return writer.writeAll("0xaaaaaaaaaaaaaaaaUL"),
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128 => return writer.writeAll("0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaULL"),
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8 => return writer.writeAll("0xaau"),
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16 => return writer.writeAll("0xaaaau"),
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32 => return writer.writeAll("0xaaaaaaaau"),
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64 => return writer.writeAll("0xaaaaaaaaaaaaaaaau"),
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128 => return renderBigInt(writer, @as(u128, 0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)),
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else => unreachable,
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}
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},
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.Float => {
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switch (ty.floatBits(dg.module.getTarget())) {
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32 => return writer.writeAll("zig_bitcast_f32_u32(0xaaaaaaaa)"),
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64 => return writer.writeAll("zig_bitcast_f64_u64(0xaaaaaaaaaaaaaaaa)"),
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32 => return writer.writeAll("zig_bitcast_f32_u32(0xaaaaaaaau)"),
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64 => return writer.writeAll("zig_bitcast_f64_u64(0xaaaaaaaaaaaaaaaau)"),
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else => return dg.fail("TODO float types > 64 bits are not support in renderValue() as of now", .{}),
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}
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},
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@ -265,10 +295,18 @@ pub const DeclGen = struct {
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}
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}
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switch (ty.zigTypeTag()) {
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.Int => {
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if (ty.isSignedInt())
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return writer.print("{d}", .{val.toSignedInt()});
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return writer.print("{d}", .{val.toUnsignedInt()});
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.Int => switch (val.tag()) {
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.int_big_positive => try renderBigInt(writer, val.castTag(.int_big_positive).?.asBigInt().to(u128) catch {
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return dg.fail("TODO implement integer constants larger than 128 bits", .{});
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}),
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.int_big_negative => try renderBigInt(writer, val.castTag(.int_big_negative).?.asBigInt().to(i128) catch {
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return dg.fail("TODO implement integer constants larger than 128 bits", .{});
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}),
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else => {
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if (ty.isSignedInt())
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return writer.print("{d}", .{val.toSignedInt()});
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return writer.print("{d}u", .{val.toUnsignedInt()});
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}
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},
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.Float => {
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if (ty.floatBits(dg.module.getTarget()) <= 64) {
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@ -286,8 +324,17 @@ pub const DeclGen = struct {
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return dg.fail("TODO: C backend: implement lowering large float values", .{});
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},
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.Pointer => switch (val.tag()) {
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.null_value, .zero => try writer.writeAll("NULL"),
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.one => try writer.writeAll("1"),
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.null_value => try writer.writeAll("NULL"),
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// Technically this should produce NULL but the integer literal 0 will always coerce
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// to the assigned pointer type. Note this is just a hack to fix warnings from ordered comparisons (<, >, etc)
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// between pointers and 0, which is an extension to begin with.
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.zero => try writer.writeByte('0'),
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.one => {
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// int constants like 1 will not cast to the pointer however.
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try writer.writeAll("((");
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try dg.renderType(writer, ty);
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return writer.writeAll(")1)");
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},
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.decl_ref => {
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const decl = val.castTag(.decl_ref).?.data;
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return dg.renderDeclValue(writer, ty, val, decl);
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@ -316,6 +363,11 @@ pub const DeclGen = struct {
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const decl = val.castTag(.extern_fn).?.data;
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try dg.renderDeclName(decl, writer);
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},
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.int_u64 => {
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try writer.writeAll("((");
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try dg.renderType(writer, ty);
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try writer.print(")0x{x}u)", .{val.toUnsignedInt()});
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},
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else => unreachable,
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},
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.Array => {
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@ -728,6 +780,8 @@ pub const DeclGen = struct {
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.i32 => try w.writeAll("int32_t"),
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.u64 => try w.writeAll("uint64_t"),
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.i64 => try w.writeAll("int64_t"),
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.u128 => try w.writeAll("uint128_t"),
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.i128 => try w.writeAll("int128_t"),
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.usize => try w.writeAll("uintptr_t"),
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.isize => try w.writeAll("intptr_t"),
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.c_short => try w.writeAll("short"),
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@ -787,8 +841,9 @@ pub const DeclGen = struct {
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},
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.Array => {
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// We are referencing the array so it will decay to a C pointer.
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try dg.renderType(w, t.elemType());
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return w.writeAll(" *");
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// NB: arrays are not really types in C so they are either specified in the declaration
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// or are already pointed to; our only job is to render the element's type.
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return dg.renderType(w, t.elemType());
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},
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.Optional => {
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var opt_buf: Type.Payload.ElemType = undefined;
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@ -1068,12 +1123,15 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
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.unreach => try airUnreach(f),
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.fence => try airFence(f, inst),
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.ptr_add => try airPtrAddSub (f, inst, " + "),
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.ptr_sub => try airPtrAddSub (f, inst, " - "),
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// TODO use a different strategy for add that communicates to the optimizer
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// that wrapping is UB.
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.add, .ptr_add => try airBinOp (f, inst, " + "),
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.add => try airBinOp (f, inst, " + "),
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// TODO use a different strategy for sub that communicates to the optimizer
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// that wrapping is UB.
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.sub, .ptr_sub => try airBinOp (f, inst, " - "),
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.sub => try airBinOp (f, inst, " - "),
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// TODO use a different strategy for mul that communicates to the optimizer
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// that wrapping is UB.
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.mul => try airBinOp (f, inst, " * "),
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@ -1187,7 +1245,7 @@ fn genBody(f: *Function, body: []const Air.Inst.Index) error{ AnalysisFail, OutO
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.ptr_slice_len_ptr => try airPtrSliceFieldPtr(f, inst, ".len;\n"),
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.ptr_slice_ptr_ptr => try airPtrSliceFieldPtr(f, inst, ".ptr;\n"),
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.ptr_elem_val => try airPtrElemVal(f, inst, "["),
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.ptr_elem_val => try airPtrElemVal(f, inst),
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.ptr_elem_ptr => try airPtrElemPtr(f, inst),
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.slice_elem_val => try airSliceElemVal(f, inst),
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.slice_elem_ptr => try airSliceElemPtr(f, inst),
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@ -1240,20 +1298,39 @@ fn airPtrSliceFieldPtr(f: *Function, inst: Air.Inst.Index, suffix: []const u8) !
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return f.fail("TODO: C backend: airPtrSliceFieldPtr", .{});
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}
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fn airPtrElemVal(f: *Function, inst: Air.Inst.Index, prefix: []const u8) !CValue {
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const is_volatile = false; // TODO
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if (!is_volatile and f.liveness.isUnused(inst))
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return CValue.none;
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fn airPtrElemVal(f: *Function, inst: Air.Inst.Index) !CValue {
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const bin_op = f.air.instructions.items(.data)[inst].bin_op;
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const slice_ty = f.air.typeOf(bin_op.lhs);
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if (!slice_ty.isVolatilePtr() and f.liveness.isUnused(inst)) return CValue.none;
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_ = prefix;
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return f.fail("TODO: C backend: airPtrElemVal", .{});
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const arr = try f.resolveInst(bin_op.lhs);
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const index = try f.resolveInst(bin_op.rhs);
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const writer = f.object.writer();
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const local = try f.allocLocal(f.air.typeOfIndex(inst), .Const);
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try writer.writeAll(" = ");
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try f.writeCValue(writer, arr);
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try writer.writeByte('[');
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try f.writeCValue(writer, index);
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try writer.writeAll("];\n");
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return local;
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}
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fn airPtrElemPtr(f: *Function, inst: Air.Inst.Index) !CValue {
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if (f.liveness.isUnused(inst))
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return CValue.none;
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if (f.liveness.isUnused(inst)) return CValue.none;
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return f.fail("TODO: C backend: airPtrElemPtr", .{});
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const ty_pl = f.air.instructions.items(.data)[inst].ty_pl;
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const bin_op = f.air.extraData(Air.Bin, ty_pl.payload).data;
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const arr = try f.resolveInst(bin_op.lhs);
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const index = try f.resolveInst(bin_op.rhs);
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const writer = f.object.writer();
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const local = try f.allocLocal(f.air.typeOfIndex(inst), .Const);
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try writer.writeAll(" = &");
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try f.writeCValue(writer, arr);
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try writer.writeByte('[');
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try f.writeCValue(writer, index);
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try writer.writeAll("];\n");
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return local;
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}
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fn airSliceElemVal(f: *Function, inst: Air.Inst.Index) !CValue {
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@ -1317,6 +1394,10 @@ fn airAlloc(f: *Function, inst: Air.Inst.Index) !CValue {
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const local = try f.allocLocal(elem_type, mutability);
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try writer.writeAll(";\n");
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// Arrays are already pointers so they don't need to be referenced.
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if (elem_type.zigTypeTag() == .Array)
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return CValue{ .local = local.local };
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return CValue{ .local_ref = local.local };
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}
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@ -1810,6 +1891,33 @@ fn airBinOp(f: *Function, inst: Air.Inst.Index, operator: [*:0]const u8) !CValue
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return local;
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}
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fn airPtrAddSub(f: *Function, inst: Air.Inst.Index, operator: [*:0]const u8) !CValue {
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if (f.liveness.isUnused(inst))
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return CValue.none;
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const bin_op = f.air.instructions.items(.data)[inst].bin_op;
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const lhs = try f.resolveInst(bin_op.lhs);
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const rhs = try f.resolveInst(bin_op.rhs);
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const writer = f.object.writer();
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const inst_ty = f.air.typeOfIndex(inst);
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const local = try f.allocLocal(inst_ty, .Const);
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// We must convert to and from integer types to prevent UB if the operation results in a NULL pointer,
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// or if LHS is NULL. The operation is only UB if the result is NULL and then dereferenced.
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try writer.writeAll(" = (");
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try f.renderType(writer, inst_ty);
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try writer.writeAll(")(((uintptr_t)");
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try f.writeCValue(writer, lhs);
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try writer.print("){s}(", .{operator});
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try f.writeCValue(writer, rhs);
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try writer.writeAll("*sizeof(");
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try f.renderType(writer, inst_ty.childType());
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try writer.print(")));\n", .{});
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return local;
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}
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fn airMinMax(f: *Function, inst: Air.Inst.Index, operator: [*:0]const u8) !CValue {
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if (f.liveness.isUnused(inst)) return CValue.none;
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@ -2529,7 +2637,9 @@ fn airPtrToInt(f: *Function, inst: Air.Inst.Index) !CValue {
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const writer = f.object.writer();
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const operand = try f.resolveInst(un_op);
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try writer.writeAll(" = ");
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try writer.writeAll(" = (");
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try f.renderType(writer, inst_ty);
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try writer.writeAll(")");
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try f.writeCValue(writer, operand);
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try writer.writeAll(";\n");
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return local;
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@ -2,6 +2,7 @@ const builtin = @import("builtin");
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test {
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// Tests that pass for stage1, stage2, and the C backend.
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_ = @import("behavior/align.zig");
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_ = @import("behavior/basic.zig");
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_ = @import("behavior/bitcast.zig");
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_ = @import("behavior/bool.zig");
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@ -19,16 +20,18 @@ test {
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_ = @import("behavior/bugs/4769_b.zig");
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_ = @import("behavior/bugs/6850.zig");
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_ = @import("behavior/call.zig");
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_ = @import("behavior/cast_c.zig");
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_ = @import("behavior/defer.zig");
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_ = @import("behavior/enum.zig");
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_ = @import("behavior/hasdecl.zig");
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_ = @import("behavior/hasfield.zig");
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_ = @import("behavior/if.zig");
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_ = @import("behavior/struct.zig");
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_ = @import("behavior/truncate.zig");
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_ = @import("behavior/int128.zig");
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_ = @import("behavior/null.zig");
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_ = @import("behavior/pointers.zig");
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_ = @import("behavior/ptrcast.zig");
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_ = @import("behavior/pub_enum.zig");
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_ = @import("behavior/struct.zig");
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_ = @import("behavior/truncate.zig");
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_ = @import("behavior/underscore.zig");
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_ = @import("behavior/usingnamespace.zig");
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@ -39,7 +42,6 @@ test {
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if (builtin.object_format != .c) {
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// Tests that pass for stage1 and stage2 but not the C backend.
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_ = @import("behavior/align.zig");
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_ = @import("behavior/array.zig");
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_ = @import("behavior/atomics.zig");
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_ = @import("behavior/basic_llvm.zig");
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@ -60,7 +62,6 @@ test {
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_ = @import("behavior/maximum_minimum.zig");
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_ = @import("behavior/null_llvm.zig");
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_ = @import("behavior/optional.zig");
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_ = @import("behavior/pointers.zig");
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_ = @import("behavior/popcount.zig");
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_ = @import("behavior/saturating_arithmetic.zig");
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_ = @import("behavior/sizeof_and_typeof.zig");
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@ -2,70 +2,8 @@ const std = @import("std");
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const expect = std.testing.expect;
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const mem = std.mem;
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const maxInt = std.math.maxInt;
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const Vector = std.meta.Vector;
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const native_endian = @import("builtin").target.cpu.arch.endian();
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test "int to ptr cast" {
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const x = @as(usize, 13);
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const y = @intToPtr(*u8, x);
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const z = @ptrToInt(y);
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try expect(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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try expect(@ptrToInt(vga_mem) == 0xB8000);
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}
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test "peer type resolution: ?T and T" {
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try expect(peerTypeTAndOptionalT(true, false).? == 0);
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try expect(peerTypeTAndOptionalT(false, false).? == 3);
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comptime {
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try expect(peerTypeTAndOptionalT(true, false).? == 0);
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try expect(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 @as(usize, 0);
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}
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return @as(usize, 3);
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}
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test "resolve undefined with integer" {
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try testResolveUndefWithInt(true, 1234);
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comptime try 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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try expect(value == x);
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}
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}
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test "@intCast i32 to u7" {
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var x: u128 = maxInt(u128);
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var y: i32 = 120;
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var z = x >> @intCast(u7, y);
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try expect(z == 0xff);
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}
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test "@intCast to comptime_int" {
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try expect(@intCast(comptime_int, 0) == 0);
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}
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test "implicit cast comptime numbers to any type when the value fits" {
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const a: u64 = 255;
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var b: u8 = a;
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try expect(b == 255);
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}
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test "implicit cast comptime_int to comptime_float" {
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comptime try expect(@as(comptime_float, 10) == @as(f32, 10));
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try expect(2 == 2.0);
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}
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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');
|
||||
}
|
||||
|
||||
249
test/behavior/cast_c.zig
Normal file
249
test/behavior/cast_c.zig
Normal file
@ -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');
|
||||
}
|
||||
43
test/behavior/int128.zig
Normal file
43
test/behavior/int128.zig
Normal file
@ -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));
|
||||
}
|
||||
@ -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" {
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user