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Sema: implement comptime coerce_result_ptr and alloc
This is progress towards being able to use `builtin.cpu.arch` instead of the `stage2_arch` workaround. The next blocker is comptime `elemVal`.
This commit is contained in:
Andrew Kelley
parent
2a701a92c4
commit
e851d89113
53
src/Sema.zig
53
src/Sema.zig
@ -1340,29 +1340,50 @@ fn zirCoerceResultPtr(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileE
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const pointee_ty = try sema.resolveType(block, src, bin_inst.lhs);
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const ptr = sema.resolveInst(bin_inst.rhs);
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// Create a runtime bitcast instruction with exactly the type the pointer wants.
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const ptr_ty = try Type.ptr(sema.arena, .{
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.pointee_type = pointee_ty,
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.@"addrspace" = target_util.defaultAddressSpace(sema.mod.getTarget(), .local),
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});
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try sema.requireRuntimeBlock(block, src);
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const bitcasted_ptr = try block.addTyOp(.bitcast, ptr_ty, ptr);
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if (Air.refToIndex(ptr)) |ptr_inst| {
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if (sema.air_instructions.items(.tag)[ptr_inst] == .constant) {
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const air_datas = sema.air_instructions.items(.data);
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const ptr_val = sema.air_values.items[air_datas[ptr_inst].ty_pl.payload];
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if (ptr_val.castTag(.inferred_alloc)) |inferred_alloc| {
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// Add the stored instruction to the set we will use to resolve peer types
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// for the inferred allocation.
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// This instruction will not make it to codegen; it is only to participate
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// in the `stored_inst_list` of the `inferred_alloc`.
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const operand = try block.addTyOp(.bitcast, pointee_ty, .void_value);
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try inferred_alloc.data.stored_inst_list.append(sema.arena, operand);
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switch (ptr_val.tag()) {
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.inferred_alloc => {
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const inferred_alloc = &ptr_val.castTag(.inferred_alloc).?.data;
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// Add the stored instruction to the set we will use to resolve peer types
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// for the inferred allocation.
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// This instruction will not make it to codegen; it is only to participate
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// in the `stored_inst_list` of the `inferred_alloc`.
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const operand = try block.addTyOp(.bitcast, pointee_ty, .void_value);
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try inferred_alloc.stored_inst_list.append(sema.arena, operand);
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},
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.inferred_alloc_comptime => {
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const iac = ptr_val.castTag(.inferred_alloc_comptime).?;
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// There will be only one coerce_result_ptr because we are running at comptime.
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// The alloc will turn into a Decl.
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var anon_decl = try block.startAnonDecl();
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defer anon_decl.deinit();
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iac.data = try anon_decl.finish(
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try pointee_ty.copy(anon_decl.arena()),
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Value.undef,
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);
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return sema.addConstant(
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ptr_ty,
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try Value.Tag.decl_ref_mut.create(sema.arena, .{
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.decl = iac.data,
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.runtime_index = block.runtime_index,
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}),
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);
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},
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.decl_ref_mut => return sema.addConstant(ptr_ty, ptr_val),
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else => {},
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}
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}
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}
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try sema.requireRuntimeBlock(block, src);
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const bitcasted_ptr = try block.addTyOp(.bitcast, ptr_ty, ptr);
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return bitcasted_ptr;
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}
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@ -1996,6 +2017,9 @@ fn zirAlloc(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.I
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const ty_src: LazySrcLoc = .{ .node_offset_var_decl_ty = inst_data.src_node };
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const var_decl_src = inst_data.src();
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const var_type = try sema.resolveType(block, ty_src, inst_data.operand);
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if (block.is_comptime) {
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return sema.analyzeComptimeAlloc(block, var_type);
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}
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const ptr_type = try Type.ptr(sema.arena, .{
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.pointee_type = var_type,
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.@"addrspace" = target_util.defaultAddressSpace(sema.mod.getTarget(), .local),
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@ -13418,9 +13442,10 @@ fn analyzeComptimeAlloc(
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defer anon_decl.deinit();
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const decl = try anon_decl.finish(
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try var_type.copy(anon_decl.arena()),
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// AstGen guarantees there will be a store before the first load, so we put a value
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// here indicating there is no valid value.
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Value.initTag(.unreachable_value),
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// There will be stores before the first load, but they may be to sub-elements or
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// sub-fields. So we need to initialize with undef to allow the mechanism to expand
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// into fields/elements and have those overridden with stored values.
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Value.undef,
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);
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try sema.mod.declareDeclDependency(sema.owner_decl, decl);
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return sema.addConstant(ptr_type, try Value.Tag.decl_ref_mut.create(sema.arena, .{
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@ -26,6 +26,7 @@ test {
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_ = @import("behavior/math.zig");
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_ = @import("behavior/member_func.zig");
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_ = @import("behavior/pointers.zig");
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_ = @import("behavior/slice.zig");
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_ = @import("behavior/sizeof_and_typeof.zig");
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_ = @import("behavior/struct.zig");
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_ = @import("behavior/switch.zig");
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@ -150,7 +151,7 @@ test {
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_ = @import("behavior/shuffle.zig");
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_ = @import("behavior/select.zig");
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_ = @import("behavior/sizeof_and_typeof_stage1.zig");
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_ = @import("behavior/slice.zig");
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_ = @import("behavior/slice_stage1.zig");
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_ = @import("behavior/slice_sentinel_comptime.zig");
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_ = @import("behavior/struct_stage1.zig");
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_ = @import("behavior/struct_contains_null_ptr_itself.zig");
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@ -3,336 +3,3 @@ const expect = std.testing.expect;
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const expectEqualSlices = std.testing.expectEqualSlices;
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const expectEqual = std.testing.expectEqual;
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const mem = std.mem;
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const x = @intToPtr([*]i32, 0x1000)[0..0x500];
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const y = x[0x100..];
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test "compile time slice of pointer to hard coded address" {
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try expect(@ptrToInt(x) == 0x1000);
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try expect(x.len == 0x500);
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try expect(@ptrToInt(y) == 0x1100);
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try expect(y.len == 0x400);
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}
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test "runtime safety lets us slice from len..len" {
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var an_array = [_]u8{
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1,
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2,
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3,
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};
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try expect(mem.eql(u8, sliceFromLenToLen(an_array[0..], 3, 3), ""));
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}
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fn sliceFromLenToLen(a_slice: []u8, start: usize, end: usize) []u8 {
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return a_slice[start..end];
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}
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test "implicitly cast array of size 0 to slice" {
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var msg = [_]u8{};
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try assertLenIsZero(&msg);
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}
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fn assertLenIsZero(msg: []const u8) !void {
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try expect(msg.len == 0);
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}
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test "C pointer" {
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var buf: [*c]const u8 = "kjdhfkjdhfdkjhfkfjhdfkjdhfkdjhfdkjhf";
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var len: u32 = 10;
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var slice = buf[0..len];
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try expectEqualSlices(u8, "kjdhfkjdhf", slice);
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}
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test "C pointer slice access" {
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var buf: [10]u32 = [1]u32{42} ** 10;
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const c_ptr = @ptrCast([*c]const u32, &buf);
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var runtime_zero: usize = 0;
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comptime try expectEqual([]const u32, @TypeOf(c_ptr[runtime_zero..1]));
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comptime try expectEqual(*const [1]u32, @TypeOf(c_ptr[0..1]));
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for (c_ptr[0..5]) |*cl| {
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try expectEqual(@as(u32, 42), cl.*);
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}
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}
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fn sliceSum(comptime q: []const u8) i32 {
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comptime var result = 0;
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inline for (q) |item| {
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result += item;
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}
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return result;
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}
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test "comptime slices are disambiguated" {
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try expect(sliceSum(&[_]u8{ 1, 2 }) == 3);
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try expect(sliceSum(&[_]u8{ 3, 4 }) == 7);
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}
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test "slice type with custom alignment" {
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const LazilyResolvedType = struct {
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anything: i32,
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};
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var slice: []align(32) LazilyResolvedType = undefined;
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var array: [10]LazilyResolvedType align(32) = undefined;
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slice = &array;
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slice[1].anything = 42;
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try expect(array[1].anything == 42);
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}
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test "access len index of sentinel-terminated slice" {
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const S = struct {
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fn doTheTest() !void {
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var slice: [:0]const u8 = "hello";
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try expect(slice.len == 5);
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try expect(slice[5] == 0);
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}
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};
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try S.doTheTest();
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comptime try S.doTheTest();
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}
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test "obtaining a null terminated slice" {
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// here we have a normal array
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var buf: [50]u8 = undefined;
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buf[0] = 'a';
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buf[1] = 'b';
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buf[2] = 'c';
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buf[3] = 0;
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// now we obtain a null terminated slice:
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const ptr = buf[0..3 :0];
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_ = ptr;
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var runtime_len: usize = 3;
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const ptr2 = buf[0..runtime_len :0];
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// ptr2 is a null-terminated slice
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comptime try expect(@TypeOf(ptr2) == [:0]u8);
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comptime try expect(@TypeOf(ptr2[0..2]) == *[2]u8);
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var runtime_zero: usize = 0;
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comptime try expect(@TypeOf(ptr2[runtime_zero..2]) == []u8);
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}
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test "empty array to slice" {
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const S = struct {
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fn doTheTest() !void {
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const empty: []align(16) u8 = &[_]u8{};
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const align_1: []align(1) u8 = empty;
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const align_4: []align(4) u8 = empty;
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const align_16: []align(16) u8 = empty;
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try expectEqual(1, @typeInfo(@TypeOf(align_1)).Pointer.alignment);
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try expectEqual(4, @typeInfo(@TypeOf(align_4)).Pointer.alignment);
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try expectEqual(16, @typeInfo(@TypeOf(align_16)).Pointer.alignment);
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}
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};
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try S.doTheTest();
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comptime try S.doTheTest();
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}
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test "@ptrCast slice to pointer" {
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const S = struct {
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fn doTheTest() !void {
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var array align(@alignOf(u16)) = [5]u8{ 0xff, 0xff, 0xff, 0xff, 0xff };
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var slice: []u8 = &array;
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var ptr = @ptrCast(*u16, slice);
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try expect(ptr.* == 65535);
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}
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};
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try S.doTheTest();
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comptime try S.doTheTest();
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}
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test "slice syntax resulting in pointer-to-array" {
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const S = struct {
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fn doTheTest() !void {
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try testArray();
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try testArrayZ();
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try testArray0();
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try testArrayAlign();
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try testPointer();
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try testPointerZ();
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try testPointer0();
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try testPointerAlign();
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try testSlice();
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try testSliceZ();
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try testSlice0();
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try testSliceOpt();
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try testSliceAlign();
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}
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fn testArray() !void {
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var array = [5]u8{ 1, 2, 3, 4, 5 };
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var slice = array[1..3];
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comptime try expect(@TypeOf(slice) == *[2]u8);
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try expect(slice[0] == 2);
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try expect(slice[1] == 3);
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}
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fn testArrayZ() !void {
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var array = [5:0]u8{ 1, 2, 3, 4, 5 };
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comptime try expect(@TypeOf(array[1..3]) == *[2]u8);
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comptime try expect(@TypeOf(array[1..5]) == *[4:0]u8);
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comptime try expect(@TypeOf(array[1..]) == *[4:0]u8);
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comptime try expect(@TypeOf(array[1..3 :4]) == *[2:4]u8);
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}
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fn testArray0() !void {
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{
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var array = [0]u8{};
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var slice = array[0..0];
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comptime try expect(@TypeOf(slice) == *[0]u8);
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}
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{
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var array = [0:0]u8{};
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var slice = array[0..0];
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comptime try expect(@TypeOf(slice) == *[0:0]u8);
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try expect(slice[0] == 0);
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}
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}
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fn testArrayAlign() !void {
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var array align(4) = [5]u8{ 1, 2, 3, 4, 5 };
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var slice = array[4..5];
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comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
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try expect(slice[0] == 5);
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comptime try expect(@TypeOf(array[0..2]) == *align(4) [2]u8);
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}
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fn testPointer() !void {
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var array = [5]u8{ 1, 2, 3, 4, 5 };
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var pointer: [*]u8 = &array;
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var slice = pointer[1..3];
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comptime try expect(@TypeOf(slice) == *[2]u8);
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try expect(slice[0] == 2);
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try expect(slice[1] == 3);
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}
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fn testPointerZ() !void {
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var array = [5:0]u8{ 1, 2, 3, 4, 5 };
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var pointer: [*:0]u8 = &array;
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comptime try expect(@TypeOf(pointer[1..3]) == *[2]u8);
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comptime try expect(@TypeOf(pointer[1..3 :4]) == *[2:4]u8);
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}
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fn testPointer0() !void {
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var pointer: [*]const u0 = &[1]u0{0};
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var slice = pointer[0..1];
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comptime try expect(@TypeOf(slice) == *const [1]u0);
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try expect(slice[0] == 0);
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}
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fn testPointerAlign() !void {
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var array align(4) = [5]u8{ 1, 2, 3, 4, 5 };
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var pointer: [*]align(4) u8 = &array;
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var slice = pointer[4..5];
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comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
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try expect(slice[0] == 5);
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comptime try expect(@TypeOf(pointer[0..2]) == *align(4) [2]u8);
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}
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fn testSlice() !void {
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var array = [5]u8{ 1, 2, 3, 4, 5 };
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var src_slice: []u8 = &array;
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var slice = src_slice[1..3];
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comptime try expect(@TypeOf(slice) == *[2]u8);
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try expect(slice[0] == 2);
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try expect(slice[1] == 3);
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}
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fn testSliceZ() !void {
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var array = [5:0]u8{ 1, 2, 3, 4, 5 };
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var slice: [:0]u8 = &array;
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comptime try expect(@TypeOf(slice[1..3]) == *[2]u8);
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comptime try expect(@TypeOf(slice[1..]) == [:0]u8);
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comptime try expect(@TypeOf(slice[1..3 :4]) == *[2:4]u8);
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}
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fn testSliceOpt() !void {
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var array: [2]u8 = [2]u8{ 1, 2 };
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var slice: ?[]u8 = &array;
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comptime try expect(@TypeOf(&array, slice) == ?[]u8);
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comptime try expect(@TypeOf(slice.?[0..2]) == *[2]u8);
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}
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fn testSlice0() !void {
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{
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var array = [0]u8{};
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var src_slice: []u8 = &array;
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var slice = src_slice[0..0];
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comptime try expect(@TypeOf(slice) == *[0]u8);
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}
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{
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var array = [0:0]u8{};
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var src_slice: [:0]u8 = &array;
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var slice = src_slice[0..0];
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comptime try expect(@TypeOf(slice) == *[0]u8);
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}
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}
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fn testSliceAlign() !void {
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var array align(4) = [5]u8{ 1, 2, 3, 4, 5 };
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var src_slice: []align(4) u8 = &array;
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var slice = src_slice[4..5];
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comptime try expect(@TypeOf(slice) == *align(4) [1]u8);
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try expect(slice[0] == 5);
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comptime try expect(@TypeOf(src_slice[0..2]) == *align(4) [2]u8);
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}
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fn testConcatStrLiterals() !void {
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try expectEqualSlices("a"[0..] ++ "b"[0..], "ab");
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try expectEqualSlices("a"[0.. :0] ++ "b"[0.. :0], "ab");
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}
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};
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try S.doTheTest();
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comptime try S.doTheTest();
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}
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test "slice of hardcoded address to pointer" {
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const S = struct {
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fn doTheTest() !void {
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const pointer = @intToPtr([*]u8, 0x04)[0..2];
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comptime try expect(@TypeOf(pointer) == *[2]u8);
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const slice: []const u8 = pointer;
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try expect(@ptrToInt(slice.ptr) == 4);
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try expect(slice.len == 2);
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}
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};
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try S.doTheTest();
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}
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test "type coercion of pointer to anon struct literal to pointer to slice" {
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const S = struct {
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const U = union {
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a: u32,
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b: bool,
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c: []const u8,
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};
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fn doTheTest() !void {
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var x1: u8 = 42;
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const t1 = &.{ x1, 56, 54 };
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var slice1: []const u8 = t1;
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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();
|
||||
}
|
||||
|
||||
334
test/behavior/slice_stage1.zig
Normal file
334
test/behavior/slice_stage1.zig
Normal file
@ -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();
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user