Commit e851d89113
Changed files (4)
src
test
src/Sema.zig
@@ -1340,29 +1340,50 @@ fn zirCoerceResultPtr(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileE
const pointee_ty = try sema.resolveType(block, src, bin_inst.lhs);
const ptr = sema.resolveInst(bin_inst.rhs);
- // Create a runtime bitcast instruction with exactly the type the pointer wants.
const ptr_ty = try Type.ptr(sema.arena, .{
.pointee_type = pointee_ty,
.@"addrspace" = target_util.defaultAddressSpace(sema.mod.getTarget(), .local),
});
- try sema.requireRuntimeBlock(block, src);
- const bitcasted_ptr = try block.addTyOp(.bitcast, ptr_ty, ptr);
if (Air.refToIndex(ptr)) |ptr_inst| {
if (sema.air_instructions.items(.tag)[ptr_inst] == .constant) {
const air_datas = sema.air_instructions.items(.data);
const ptr_val = sema.air_values.items[air_datas[ptr_inst].ty_pl.payload];
- if (ptr_val.castTag(.inferred_alloc)) |inferred_alloc| {
- // Add the stored instruction to the set we will use to resolve peer types
- // for the inferred allocation.
- // This instruction will not make it to codegen; it is only to participate
- // in the `stored_inst_list` of the `inferred_alloc`.
- const operand = try block.addTyOp(.bitcast, pointee_ty, .void_value);
- try inferred_alloc.data.stored_inst_list.append(sema.arena, operand);
+ switch (ptr_val.tag()) {
+ .inferred_alloc => {
+ const inferred_alloc = &ptr_val.castTag(.inferred_alloc).?.data;
+ // Add the stored instruction to the set we will use to resolve peer types
+ // for the inferred allocation.
+ // This instruction will not make it to codegen; it is only to participate
+ // in the `stored_inst_list` of the `inferred_alloc`.
+ const operand = try block.addTyOp(.bitcast, pointee_ty, .void_value);
+ try inferred_alloc.stored_inst_list.append(sema.arena, operand);
+ },
+ .inferred_alloc_comptime => {
+ const iac = ptr_val.castTag(.inferred_alloc_comptime).?;
+ // There will be only one coerce_result_ptr because we are running at comptime.
+ // The alloc will turn into a Decl.
+ var anon_decl = try block.startAnonDecl();
+ defer anon_decl.deinit();
+ iac.data = try anon_decl.finish(
+ try pointee_ty.copy(anon_decl.arena()),
+ Value.undef,
+ );
+ return sema.addConstant(
+ ptr_ty,
+ try Value.Tag.decl_ref_mut.create(sema.arena, .{
+ .decl = iac.data,
+ .runtime_index = block.runtime_index,
+ }),
+ );
+ },
+ .decl_ref_mut => return sema.addConstant(ptr_ty, ptr_val),
+ else => {},
}
}
}
-
+ try sema.requireRuntimeBlock(block, src);
+ const bitcasted_ptr = try block.addTyOp(.bitcast, ptr_ty, ptr);
return bitcasted_ptr;
}
@@ -1996,6 +2017,9 @@ fn zirAlloc(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.I
const ty_src: LazySrcLoc = .{ .node_offset_var_decl_ty = inst_data.src_node };
const var_decl_src = inst_data.src();
const var_type = try sema.resolveType(block, ty_src, inst_data.operand);
+ if (block.is_comptime) {
+ return sema.analyzeComptimeAlloc(block, var_type);
+ }
const ptr_type = try Type.ptr(sema.arena, .{
.pointee_type = var_type,
.@"addrspace" = target_util.defaultAddressSpace(sema.mod.getTarget(), .local),
@@ -13418,9 +13442,10 @@ fn analyzeComptimeAlloc(
defer anon_decl.deinit();
const decl = try anon_decl.finish(
try var_type.copy(anon_decl.arena()),
- // AstGen guarantees there will be a store before the first load, so we put a value
- // here indicating there is no valid value.
- Value.initTag(.unreachable_value),
+ // There will be stores before the first load, but they may be to sub-elements or
+ // sub-fields. So we need to initialize with undef to allow the mechanism to expand
+ // into fields/elements and have those overridden with stored values.
+ Value.undef,
);
try sema.mod.declareDeclDependency(sema.owner_decl, decl);
return sema.addConstant(ptr_type, try Value.Tag.decl_ref_mut.create(sema.arena, .{
test/behavior/slice.zig
@@ -3,336 +3,3 @@ const expect = std.testing.expect;
const expectEqualSlices = std.testing.expectEqualSlices;
const expectEqual = std.testing.expectEqual;
const mem = std.mem;
-
-const x = @intToPtr([*]i32, 0x1000)[0..0x500];
-const y = x[0x100..];
-test "compile time slice of pointer to hard coded address" {
- try expect(@ptrToInt(x) == 0x1000);
- try expect(x.len == 0x500);
-
- try expect(@ptrToInt(y) == 0x1100);
- try expect(y.len == 0x400);
-}
-
-test "runtime safety lets us slice from len..len" {
- var an_array = [_]u8{
- 1,
- 2,
- 3,
- };
- try expect(mem.eql(u8, sliceFromLenToLen(an_array[0..], 3, 3), ""));
-}
-
-fn sliceFromLenToLen(a_slice: []u8, start: usize, end: usize) []u8 {
- return a_slice[start..end];
-}
-
-test "implicitly cast array of size 0 to slice" {
- var msg = [_]u8{};
- try assertLenIsZero(&msg);
-}
-
-fn assertLenIsZero(msg: []const u8) !void {
- try expect(msg.len == 0);
-}
-
-test "C pointer" {
- var buf: [*c]const u8 = "kjdhfkjdhfdkjhfkfjhdfkjdhfkdjhfdkjhf";
- var len: u32 = 10;
- var slice = buf[0..len];
- try expectEqualSlices(u8, "kjdhfkjdhf", slice);
-}
-
-test "C pointer slice access" {
- var buf: [10]u32 = [1]u32{42} ** 10;
- const c_ptr = @ptrCast([*c]const u32, &buf);
-
- var runtime_zero: usize = 0;
- comptime try expectEqual([]const u32, @TypeOf(c_ptr[runtime_zero..1]));
- comptime try expectEqual(*const [1]u32, @TypeOf(c_ptr[0..1]));
-
- for (c_ptr[0..5]) |*cl| {
- try expectEqual(@as(u32, 42), cl.*);
- }
-}
-
-fn sliceSum(comptime q: []const u8) i32 {
- comptime var result = 0;
- inline for (q) |item| {
- result += item;
- }
- return result;
-}
-
-test "comptime slices are disambiguated" {
- try expect(sliceSum(&[_]u8{ 1, 2 }) == 3);
- try expect(sliceSum(&[_]u8{ 3, 4 }) == 7);
-}
-
-test "slice type with custom alignment" {
- const LazilyResolvedType = struct {
- anything: i32,
- };
- var slice: []align(32) LazilyResolvedType = undefined;
- var array: [10]LazilyResolvedType align(32) = undefined;
- slice = &array;
- slice[1].anything = 42;
- try expect(array[1].anything == 42);
-}
-
-test "access len index of sentinel-terminated slice" {
- const S = struct {
- fn doTheTest() !void {
- var slice: [:0]const u8 = "hello";
-
- try expect(slice.len == 5);
- try expect(slice[5] == 0);
- }
- };
- try S.doTheTest();
- comptime try S.doTheTest();
-}
-
-test "obtaining a null terminated slice" {
- // here we have a normal array
- var buf: [50]u8 = undefined;
-
- buf[0] = 'a';
- buf[1] = 'b';
- buf[2] = 'c';
- buf[3] = 0;
-
- // now we obtain a null terminated slice:
- const ptr = buf[0..3 :0];
- _ = ptr;
-
- var runtime_len: usize = 3;
- const ptr2 = buf[0..runtime_len :0];
- // ptr2 is a null-terminated slice
- comptime try expect(@TypeOf(ptr2) == [:0]u8);
- comptime try expect(@TypeOf(ptr2[0..2]) == *[2]u8);
- var runtime_zero: usize = 0;
- comptime try expect(@TypeOf(ptr2[runtime_zero..2]) == []u8);
-}
-
-test "empty array to slice" {
- const S = struct {
- fn doTheTest() !void {
- const empty: []align(16) u8 = &[_]u8{};
- const align_1: []align(1) u8 = empty;
- const align_4: []align(4) u8 = empty;
- const align_16: []align(16) u8 = empty;
- try expectEqual(1, @typeInfo(@TypeOf(align_1)).Pointer.alignment);
- try expectEqual(4, @typeInfo(@TypeOf(align_4)).Pointer.alignment);
- try expectEqual(16, @typeInfo(@TypeOf(align_16)).Pointer.alignment);
- }
- };
-
- try S.doTheTest();
- comptime try S.doTheTest();
-}
-
-test "@ptrCast slice to pointer" {
- const S = struct {
- fn doTheTest() !void {
- var array align(@alignOf(u16)) = [5]u8{ 0xff, 0xff, 0xff, 0xff, 0xff };
- var slice: []u8 = &array;
- var ptr = @ptrCast(*u16, slice);
- try expect(ptr.* == 65535);
- }
- };
-
- try S.doTheTest();
- comptime try S.doTheTest();
-}
-
-test "slice syntax resulting in pointer-to-array" {
- const S = struct {
- fn doTheTest() !void {
- try testArray();
- try testArrayZ();
- try testArray0();
- try testArrayAlign();
- try testPointer();
- try testPointerZ();
- try testPointer0();
- try testPointerAlign();
- try testSlice();
- try testSliceZ();
- try testSlice0();
- try testSliceOpt();
- try testSliceAlign();
- }
-
- fn testArray() !void {
- var array = [5]u8{ 1, 2, 3, 4, 5 };
- var slice = array[1..3];
- comptime try expect(@TypeOf(slice) == *[2]u8);
- try expect(slice[0] == 2);
- try expect(slice[1] == 3);
- }
-
- fn testArrayZ() !void {
- var array = [5:0]u8{ 1, 2, 3, 4, 5 };
- comptime try expect(@TypeOf(array[1..3]) == *[2]u8);
- comptime try expect(@TypeOf(array[1..5]) == *[4:0]u8);
- comptime try expect(@TypeOf(array[1..]) == *[4:0]u8);
- comptime try expect(@TypeOf(array[1..3 :4]) == *[2:4]u8);
- }
-
- fn testArray0() !void {
- {
- var array = [0]u8{};
- var slice = array[0..0];
- comptime try expect(@TypeOf(slice) == *[0]u8);
- }
- {
- var array = [0:0]u8{};
- var slice = array[0..0];
- comptime try expect(@TypeOf(slice) == *[0:0]u8);
- try expect(slice[0] == 0);
- }
- }
-
- fn testArrayAlign() !void {
- var array align(4) = [5]u8{ 1, 2, 3, 4, 5 };
- var slice = array[4..5];
- comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
- try expect(slice[0] == 5);
- comptime try expect(@TypeOf(array[0..2]) == *align(4) [2]u8);
- }
-
- fn testPointer() !void {
- var array = [5]u8{ 1, 2, 3, 4, 5 };
- var pointer: [*]u8 = &array;
- var slice = pointer[1..3];
- comptime try expect(@TypeOf(slice) == *[2]u8);
- try expect(slice[0] == 2);
- try expect(slice[1] == 3);
- }
-
- fn testPointerZ() !void {
- var array = [5:0]u8{ 1, 2, 3, 4, 5 };
- var pointer: [*:0]u8 = &array;
- comptime try expect(@TypeOf(pointer[1..3]) == *[2]u8);
- comptime try expect(@TypeOf(pointer[1..3 :4]) == *[2:4]u8);
- }
-
- fn testPointer0() !void {
- var pointer: [*]const u0 = &[1]u0{0};
- var slice = pointer[0..1];
- comptime try expect(@TypeOf(slice) == *const [1]u0);
- try expect(slice[0] == 0);
- }
-
- fn testPointerAlign() !void {
- var array align(4) = [5]u8{ 1, 2, 3, 4, 5 };
- var pointer: [*]align(4) u8 = &array;
- var slice = pointer[4..5];
- comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
- try expect(slice[0] == 5);
- comptime try expect(@TypeOf(pointer[0..2]) == *align(4) [2]u8);
- }
-
- fn testSlice() !void {
- var array = [5]u8{ 1, 2, 3, 4, 5 };
- var src_slice: []u8 = &array;
- var slice = src_slice[1..3];
- comptime try expect(@TypeOf(slice) == *[2]u8);
- try expect(slice[0] == 2);
- try expect(slice[1] == 3);
- }
-
- fn testSliceZ() !void {
- var array = [5:0]u8{ 1, 2, 3, 4, 5 };
- var slice: [:0]u8 = &array;
- comptime try expect(@TypeOf(slice[1..3]) == *[2]u8);
- comptime try expect(@TypeOf(slice[1..]) == [:0]u8);
- comptime try expect(@TypeOf(slice[1..3 :4]) == *[2:4]u8);
- }
-
- fn testSliceOpt() !void {
- var array: [2]u8 = [2]u8{ 1, 2 };
- var slice: ?[]u8 = &array;
- comptime try expect(@TypeOf(&array, slice) == ?[]u8);
- comptime try expect(@TypeOf(slice.?[0..2]) == *[2]u8);
- }
-
- fn testSlice0() !void {
- {
- var array = [0]u8{};
- var src_slice: []u8 = &array;
- var slice = src_slice[0..0];
- comptime try expect(@TypeOf(slice) == *[0]u8);
- }
- {
- var array = [0:0]u8{};
- var src_slice: [:0]u8 = &array;
- var slice = src_slice[0..0];
- comptime try expect(@TypeOf(slice) == *[0]u8);
- }
- }
-
- fn testSliceAlign() !void {
- var array align(4) = [5]u8{ 1, 2, 3, 4, 5 };
- var src_slice: []align(4) u8 = &array;
- var slice = src_slice[4..5];
- comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
- try expect(slice[0] == 5);
- comptime try expect(@TypeOf(src_slice[0..2]) == *align(4) [2]u8);
- }
-
- fn testConcatStrLiterals() !void {
- try expectEqualSlices("a"[0..] ++ "b"[0..], "ab");
- try expectEqualSlices("a"[0.. :0] ++ "b"[0.. :0], "ab");
- }
- };
-
- try S.doTheTest();
- comptime try S.doTheTest();
-}
-
-test "slice of hardcoded address to pointer" {
- const S = struct {
- fn doTheTest() !void {
- const pointer = @intToPtr([*]u8, 0x04)[0..2];
- comptime try expect(@TypeOf(pointer) == *[2]u8);
- const slice: []const u8 = pointer;
- try expect(@ptrToInt(slice.ptr) == 4);
- try expect(slice.len == 2);
- }
- };
-
- try S.doTheTest();
-}
-
-test "type coercion of pointer to anon struct literal to pointer to slice" {
- const S = struct {
- const U = union {
- a: u32,
- b: bool,
- c: []const u8,
- };
-
- fn doTheTest() !void {
- var x1: u8 = 42;
- const t1 = &.{ x1, 56, 54 };
- var slice1: []const u8 = t1;
- try expect(slice1.len == 3);
- try expect(slice1[0] == 42);
- try expect(slice1[1] == 56);
- try expect(slice1[2] == 54);
-
- var x2: []const u8 = "hello";
- const t2 = &.{ x2, ", ", "world!" };
- // @compileLog(@TypeOf(t2));
- var slice2: []const []const u8 = t2;
- try expect(slice2.len == 3);
- try expect(mem.eql(u8, slice2[0], "hello"));
- try expect(mem.eql(u8, slice2[1], ", "));
- try expect(mem.eql(u8, slice2[2], "world!"));
- }
- };
- // try S.doTheTest();
- comptime try S.doTheTest();
-}
test/behavior/slice_stage1.zig
@@ -0,0 +1,334 @@
+const std = @import("std");
+const expect = std.testing.expect;
+const expectEqualSlices = std.testing.expectEqualSlices;
+const expectEqual = std.testing.expectEqual;
+const mem = std.mem;
+
+const x = @intToPtr([*]i32, 0x1000)[0..0x500];
+const y = x[0x100..];
+test "compile time slice of pointer to hard coded address" {
+ try expect(@ptrToInt(x) == 0x1000);
+ try expect(x.len == 0x500);
+
+ try expect(@ptrToInt(y) == 0x1100);
+ try expect(y.len == 0x400);
+}
+
+test "runtime safety lets us slice from len..len" {
+ var an_array = [_]u8{ 1, 2, 3 };
+ try expect(mem.eql(u8, sliceFromLenToLen(an_array[0..], 3, 3), ""));
+}
+
+fn sliceFromLenToLen(a_slice: []u8, start: usize, end: usize) []u8 {
+ return a_slice[start..end];
+}
+
+test "implicitly cast array of size 0 to slice" {
+ var msg = [_]u8{};
+ try assertLenIsZero(&msg);
+}
+
+fn assertLenIsZero(msg: []const u8) !void {
+ try expect(msg.len == 0);
+}
+
+test "C pointer" {
+ var buf: [*c]const u8 = "kjdhfkjdhfdkjhfkfjhdfkjdhfkdjhfdkjhf";
+ var len: u32 = 10;
+ var slice = buf[0..len];
+ try expectEqualSlices(u8, "kjdhfkjdhf", slice);
+}
+
+test "C pointer slice access" {
+ var buf: [10]u32 = [1]u32{42} ** 10;
+ const c_ptr = @ptrCast([*c]const u32, &buf);
+
+ var runtime_zero: usize = 0;
+ comptime try expectEqual([]const u32, @TypeOf(c_ptr[runtime_zero..1]));
+ comptime try expectEqual(*const [1]u32, @TypeOf(c_ptr[0..1]));
+
+ for (c_ptr[0..5]) |*cl| {
+ try expectEqual(@as(u32, 42), cl.*);
+ }
+}
+
+fn sliceSum(comptime q: []const u8) i32 {
+ comptime var result = 0;
+ inline for (q) |item| {
+ result += item;
+ }
+ return result;
+}
+
+test "comptime slices are disambiguated" {
+ try expect(sliceSum(&[_]u8{ 1, 2 }) == 3);
+ try expect(sliceSum(&[_]u8{ 3, 4 }) == 7);
+}
+
+test "slice type with custom alignment" {
+ const LazilyResolvedType = struct {
+ anything: i32,
+ };
+ var slice: []align(32) LazilyResolvedType = undefined;
+ var array: [10]LazilyResolvedType align(32) = undefined;
+ slice = &array;
+ slice[1].anything = 42;
+ try expect(array[1].anything == 42);
+}
+
+test "access len index of sentinel-terminated slice" {
+ const S = struct {
+ fn doTheTest() !void {
+ var slice: [:0]const u8 = "hello";
+
+ try expect(slice.len == 5);
+ try expect(slice[5] == 0);
+ }
+ };
+ try S.doTheTest();
+ comptime try S.doTheTest();
+}
+
+test "obtaining a null terminated slice" {
+ // here we have a normal array
+ var buf: [50]u8 = undefined;
+
+ buf[0] = 'a';
+ buf[1] = 'b';
+ buf[2] = 'c';
+ buf[3] = 0;
+
+ // now we obtain a null terminated slice:
+ const ptr = buf[0..3 :0];
+ _ = ptr;
+
+ var runtime_len: usize = 3;
+ const ptr2 = buf[0..runtime_len :0];
+ // ptr2 is a null-terminated slice
+ comptime try expect(@TypeOf(ptr2) == [:0]u8);
+ comptime try expect(@TypeOf(ptr2[0..2]) == *[2]u8);
+ var runtime_zero: usize = 0;
+ comptime try expect(@TypeOf(ptr2[runtime_zero..2]) == []u8);
+}
+
+test "empty array to slice" {
+ const S = struct {
+ fn doTheTest() !void {
+ const empty: []align(16) u8 = &[_]u8{};
+ const align_1: []align(1) u8 = empty;
+ const align_4: []align(4) u8 = empty;
+ const align_16: []align(16) u8 = empty;
+ try expectEqual(1, @typeInfo(@TypeOf(align_1)).Pointer.alignment);
+ try expectEqual(4, @typeInfo(@TypeOf(align_4)).Pointer.alignment);
+ try expectEqual(16, @typeInfo(@TypeOf(align_16)).Pointer.alignment);
+ }
+ };
+
+ try S.doTheTest();
+ comptime try S.doTheTest();
+}
+
+test "@ptrCast slice to pointer" {
+ const S = struct {
+ fn doTheTest() !void {
+ var array align(@alignOf(u16)) = [5]u8{ 0xff, 0xff, 0xff, 0xff, 0xff };
+ var slice: []u8 = &array;
+ var ptr = @ptrCast(*u16, slice);
+ try expect(ptr.* == 65535);
+ }
+ };
+
+ try S.doTheTest();
+ comptime try S.doTheTest();
+}
+
+test "slice syntax resulting in pointer-to-array" {
+ const S = struct {
+ fn doTheTest() !void {
+ try testArray();
+ try testArrayZ();
+ try testArray0();
+ try testArrayAlign();
+ try testPointer();
+ try testPointerZ();
+ try testPointer0();
+ try testPointerAlign();
+ try testSlice();
+ try testSliceZ();
+ try testSlice0();
+ try testSliceOpt();
+ try testSliceAlign();
+ }
+
+ fn testArray() !void {
+ var array = [5]u8{ 1, 2, 3, 4, 5 };
+ var slice = array[1..3];
+ comptime try expect(@TypeOf(slice) == *[2]u8);
+ try expect(slice[0] == 2);
+ try expect(slice[1] == 3);
+ }
+
+ fn testArrayZ() !void {
+ var array = [5:0]u8{ 1, 2, 3, 4, 5 };
+ comptime try expect(@TypeOf(array[1..3]) == *[2]u8);
+ comptime try expect(@TypeOf(array[1..5]) == *[4:0]u8);
+ comptime try expect(@TypeOf(array[1..]) == *[4:0]u8);
+ comptime try expect(@TypeOf(array[1..3 :4]) == *[2:4]u8);
+ }
+
+ fn testArray0() !void {
+ {
+ var array = [0]u8{};
+ var slice = array[0..0];
+ comptime try expect(@TypeOf(slice) == *[0]u8);
+ }
+ {
+ var array = [0:0]u8{};
+ var slice = array[0..0];
+ comptime try expect(@TypeOf(slice) == *[0:0]u8);
+ try expect(slice[0] == 0);
+ }
+ }
+
+ fn testArrayAlign() !void {
+ var array align(4) = [5]u8{ 1, 2, 3, 4, 5 };
+ var slice = array[4..5];
+ comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
+ try expect(slice[0] == 5);
+ comptime try expect(@TypeOf(array[0..2]) == *align(4) [2]u8);
+ }
+
+ fn testPointer() !void {
+ var array = [5]u8{ 1, 2, 3, 4, 5 };
+ var pointer: [*]u8 = &array;
+ var slice = pointer[1..3];
+ comptime try expect(@TypeOf(slice) == *[2]u8);
+ try expect(slice[0] == 2);
+ try expect(slice[1] == 3);
+ }
+
+ fn testPointerZ() !void {
+ var array = [5:0]u8{ 1, 2, 3, 4, 5 };
+ var pointer: [*:0]u8 = &array;
+ comptime try expect(@TypeOf(pointer[1..3]) == *[2]u8);
+ comptime try expect(@TypeOf(pointer[1..3 :4]) == *[2:4]u8);
+ }
+
+ fn testPointer0() !void {
+ var pointer: [*]const u0 = &[1]u0{0};
+ var slice = pointer[0..1];
+ comptime try expect(@TypeOf(slice) == *const [1]u0);
+ try expect(slice[0] == 0);
+ }
+
+ fn testPointerAlign() !void {
+ var array align(4) = [5]u8{ 1, 2, 3, 4, 5 };
+ var pointer: [*]align(4) u8 = &array;
+ var slice = pointer[4..5];
+ comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
+ try expect(slice[0] == 5);
+ comptime try expect(@TypeOf(pointer[0..2]) == *align(4) [2]u8);
+ }
+
+ fn testSlice() !void {
+ var array = [5]u8{ 1, 2, 3, 4, 5 };
+ var src_slice: []u8 = &array;
+ var slice = src_slice[1..3];
+ comptime try expect(@TypeOf(slice) == *[2]u8);
+ try expect(slice[0] == 2);
+ try expect(slice[1] == 3);
+ }
+
+ fn testSliceZ() !void {
+ var array = [5:0]u8{ 1, 2, 3, 4, 5 };
+ var slice: [:0]u8 = &array;
+ comptime try expect(@TypeOf(slice[1..3]) == *[2]u8);
+ comptime try expect(@TypeOf(slice[1..]) == [:0]u8);
+ comptime try expect(@TypeOf(slice[1..3 :4]) == *[2:4]u8);
+ }
+
+ fn testSliceOpt() !void {
+ var array: [2]u8 = [2]u8{ 1, 2 };
+ var slice: ?[]u8 = &array;
+ comptime try expect(@TypeOf(&array, slice) == ?[]u8);
+ comptime try expect(@TypeOf(slice.?[0..2]) == *[2]u8);
+ }
+
+ fn testSlice0() !void {
+ {
+ var array = [0]u8{};
+ var src_slice: []u8 = &array;
+ var slice = src_slice[0..0];
+ comptime try expect(@TypeOf(slice) == *[0]u8);
+ }
+ {
+ var array = [0:0]u8{};
+ var src_slice: [:0]u8 = &array;
+ var slice = src_slice[0..0];
+ comptime try expect(@TypeOf(slice) == *[0]u8);
+ }
+ }
+
+ fn testSliceAlign() !void {
+ var array align(4) = [5]u8{ 1, 2, 3, 4, 5 };
+ var src_slice: []align(4) u8 = &array;
+ var slice = src_slice[4..5];
+ comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
+ try expect(slice[0] == 5);
+ comptime try expect(@TypeOf(src_slice[0..2]) == *align(4) [2]u8);
+ }
+
+ fn testConcatStrLiterals() !void {
+ try expectEqualSlices("a"[0..] ++ "b"[0..], "ab");
+ try expectEqualSlices("a"[0.. :0] ++ "b"[0.. :0], "ab");
+ }
+ };
+
+ try S.doTheTest();
+ comptime try S.doTheTest();
+}
+
+test "slice of hardcoded address to pointer" {
+ const S = struct {
+ fn doTheTest() !void {
+ const pointer = @intToPtr([*]u8, 0x04)[0..2];
+ comptime try expect(@TypeOf(pointer) == *[2]u8);
+ const slice: []const u8 = pointer;
+ try expect(@ptrToInt(slice.ptr) == 4);
+ try expect(slice.len == 2);
+ }
+ };
+
+ try S.doTheTest();
+}
+
+test "type coercion of pointer to anon struct literal to pointer to slice" {
+ const S = struct {
+ const U = union {
+ a: u32,
+ b: bool,
+ c: []const u8,
+ };
+
+ fn doTheTest() !void {
+ var x1: u8 = 42;
+ const t1 = &.{ x1, 56, 54 };
+ var slice1: []const u8 = t1;
+ try expect(slice1.len == 3);
+ try expect(slice1[0] == 42);
+ try expect(slice1[1] == 56);
+ try expect(slice1[2] == 54);
+
+ var x2: []const u8 = "hello";
+ const t2 = &.{ x2, ", ", "world!" };
+ // @compileLog(@TypeOf(t2));
+ var slice2: []const []const u8 = t2;
+ try expect(slice2.len == 3);
+ try expect(mem.eql(u8, slice2[0], "hello"));
+ try expect(mem.eql(u8, slice2[1], ", "));
+ try expect(mem.eql(u8, slice2[2], "world!"));
+ }
+ };
+ // try S.doTheTest();
+ comptime try S.doTheTest();
+}
test/behavior.zig
@@ -26,6 +26,7 @@ test {
_ = @import("behavior/math.zig");
_ = @import("behavior/member_func.zig");
_ = @import("behavior/pointers.zig");
+ _ = @import("behavior/slice.zig");
_ = @import("behavior/sizeof_and_typeof.zig");
_ = @import("behavior/struct.zig");
_ = @import("behavior/switch.zig");
@@ -150,7 +151,7 @@ test {
_ = @import("behavior/shuffle.zig");
_ = @import("behavior/select.zig");
_ = @import("behavior/sizeof_and_typeof_stage1.zig");
- _ = @import("behavior/slice.zig");
+ _ = @import("behavior/slice_stage1.zig");
_ = @import("behavior/slice_sentinel_comptime.zig");
_ = @import("behavior/struct_stage1.zig");
_ = @import("behavior/struct_contains_null_ptr_itself.zig");