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Merge pull request #16192 from mlugg/builtins-infer-dest-ty-fixes

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Follow-up to cast builtin result type inference
This commit is contained in:
Andrew Kelley 2023-06-25 12:38:56 -07:00 • committed by GitHub
commit df389b62de
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10 changed files with 318 additions and 28 deletions
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2
doc/langref.html.in
View file

@ -10267,7 +10267,7 @@ pub fn main() void {
foo(Set1.B);
}
fn foo(set1: Set1) void {
const x = @as(Set2, @errSetCast(set1));
const x: Set2 = @errSetCast(set1);
std.debug.print("value: {}\n", .{x});
}
{#code_end#}

14
src/AstGen.zig
View file

@ -6483,11 +6483,11 @@ fn forExpr(
return astgen.failTok(ident_tok, "cannot capture reference to range", .{});
}
const start_node = node_data[input].lhs;
const start_val = try expr(parent_gz, scope, .{ .rl = .none }, start_node);
const start_val = try expr(parent_gz, scope, .{ .rl = .{ .coerced_ty = .usize_type } }, start_node);
const end_node = node_data[input].rhs;
const end_val = if (end_node != 0)
try expr(parent_gz, scope, .{ .rl = .none }, node_data[input].rhs)
try expr(parent_gz, scope, .{ .rl = .{ .coerced_ty = .usize_type } }, node_data[input].rhs)
else
.none;
@ -8053,17 +8053,9 @@ fn ptrCast(
}
// Full cast including result type
const need_result_type_builtin = if (flags.ptr_cast)
"@ptrCast"
else if (flags.align_cast)
"@alignCast"
else if (flags.addrspace_cast)
"@addrSpaceCast"
else
unreachable;
const cursor = maybeAdvanceSourceCursorToMainToken(gz, root_node);
const result_type = try ri.rl.resultType(gz, root_node, need_result_type_builtin);
const result_type = try ri.rl.resultType(gz, root_node, flags.needResultTypeBuiltinName());
const operand = try expr(gz, scope, .{ .rl = .none }, node);
try emitDbgStmt(gz, cursor);
const result = try gz.addExtendedPayloadSmall(.ptr_cast_full, flags_i, Zir.Inst.BinNode{

40
src/Module.zig
View file

@ -34,6 +34,7 @@ const isUpDir = @import("introspect.zig").isUpDir;
const clang = @import("clang.zig");
const InternPool = @import("InternPool.zig");
const Alignment = InternPool.Alignment;
const BuiltinFn = @import("BuiltinFn.zig");
comptime {
@setEvalBranchQuota(4000);
@ -2273,6 +2274,41 @@ pub const SrcLoc = struct {
.node_offset_builtin_call_arg3 => |n| return src_loc.byteOffsetBuiltinCallArg(gpa, n, 3),
.node_offset_builtin_call_arg4 => |n| return src_loc.byteOffsetBuiltinCallArg(gpa, n, 4),
.node_offset_builtin_call_arg5 => |n| return src_loc.byteOffsetBuiltinCallArg(gpa, n, 5),
.node_offset_ptrcast_operand => |node_off| {
const tree = try src_loc.file_scope.getTree(gpa);
const main_tokens = tree.nodes.items(.main_token);
const node_datas = tree.nodes.items(.data);
const node_tags = tree.nodes.items(.tag);
var node = src_loc.declRelativeToNodeIndex(node_off);
while (true) {
switch (node_tags[node]) {
.builtin_call_two, .builtin_call_two_comma => {},
else => break,
}
if (node_datas[node].lhs == 0) break; // 0 args
if (node_datas[node].rhs != 0) break; // 2 args
const builtin_token = main_tokens[node];
const builtin_name = tree.tokenSlice(builtin_token);
const info = BuiltinFn.list.get(builtin_name) orelse break;
switch (info.tag) {
else => break,
.ptr_cast,
.align_cast,
.addrspace_cast,
.const_cast,
.volatile_cast,
=> {},
}
node = node_datas[node].lhs;
}
return nodeToSpan(tree, node);
},
.node_offset_array_access_index => |node_off| {
const tree = try src_loc.file_scope.getTree(gpa);
const node_datas = tree.nodes.items(.data);
@ -2887,6 +2923,9 @@ pub const LazySrcLoc = union(enum) {
node_offset_builtin_call_arg3: i32,
node_offset_builtin_call_arg4: i32,
node_offset_builtin_call_arg5: i32,
/// Like `node_offset_builtin_call_arg0` but recurses through arbitrarily many calls
/// to pointer cast builtins.
node_offset_ptrcast_operand: i32,
/// The source location points to the index expression of an array access
/// expression, found by taking this AST node index offset from the containing
/// Decl AST node, which points to an array access AST node. Next, navigate
@ -3145,6 +3184,7 @@ pub const LazySrcLoc = union(enum) {
.node_offset_builtin_call_arg3,
.node_offset_builtin_call_arg4,
.node_offset_builtin_call_arg5,
.node_offset_ptrcast_operand,
.node_offset_array_access_index,
.node_offset_slice_ptr,
.node_offset_slice_start,

61
src/Sema.zig
View file

@ -1820,8 +1820,25 @@ pub fn resolveType(sema: *Sema, block: *Block, src: LazySrcLoc, zir_ref: Zir.Ins
return ty;
}
fn resolveCastDestType(sema: *Sema, block: *Block, src: LazySrcLoc, zir_ref: Zir.Inst.Ref, builtin_name: []const u8) !Type {
return sema.resolveType(block, src, zir_ref) catch |err| switch (err) {
fn resolveCastDestType(
sema: *Sema,
block: *Block,
src: LazySrcLoc,
zir_ref: Zir.Inst.Ref,
strat: enum { remove_eu_opt, remove_eu, remove_opt },
builtin_name: []const u8,
) !Type {
const mod = sema.mod;
const remove_eu = switch (strat) {
.remove_eu_opt, .remove_eu => true,
.remove_opt => false,
};
const remove_opt = switch (strat) {
.remove_eu_opt, .remove_opt => true,
.remove_eu => false,
};
const raw_ty = sema.resolveType(block, src, zir_ref) catch |err| switch (err) {
error.GenericPoison => {
// Cast builtins use their result type as the destination type, but
// it could be an anytype argument, which we can't catch in AstGen.
@ -1836,6 +1853,18 @@ fn resolveCastDestType(sema: *Sema, block: *Block, src: LazySrcLoc, zir_ref: Zir
},
else => |e| return e,
};
if (remove_eu and raw_ty.zigTypeTag(mod) == .ErrorUnion) {
const eu_child = raw_ty.errorUnionPayload(mod);
if (remove_opt and eu_child.zigTypeTag(mod) == .Optional) {
return eu_child.childType(mod);
}
return eu_child;
}
if (remove_opt and raw_ty.zigTypeTag(mod) == .Optional) {
return raw_ty.childType(mod);
}
return raw_ty;
}
fn analyzeAsType(
@ -8304,7 +8333,7 @@ fn zirEnumFromInt(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
const src = inst_data.src();
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = inst_data.src_node };
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@enumFromInt");
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu_opt, "@enumFromInt");
const operand = try sema.resolveInst(extra.rhs);
if (dest_ty.zigTypeTag(mod) != .Enum) {
@ -9600,7 +9629,7 @@ fn zirIntCast(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = inst_data.src_node };
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@intCast");
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu_opt, "@intCast");
const operand = try sema.resolveInst(extra.rhs);
return sema.intCast(block, inst_data.src(), dest_ty, src, operand, operand_src, true);
@ -9761,7 +9790,7 @@ fn zirBitcast(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = inst_data.src_node };
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@bitCast");
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu_opt, "@bitCast");
const operand = try sema.resolveInst(extra.rhs);
const operand_ty = sema.typeOf(operand);
switch (dest_ty.zigTypeTag(mod)) {
@ -9904,7 +9933,7 @@ fn zirFloatCast(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!A
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = inst_data.src_node };
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@floatCast");
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu_opt, "@floatCast");
const operand = try sema.resolveInst(extra.rhs);
const target = mod.getTarget();
@ -20706,7 +20735,7 @@ fn zirIntFromFloat(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileErro
const src = inst_data.src();
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = inst_data.src_node };
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@intFromFloat");
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu_opt, "@intFromFloat");
const operand = try sema.resolveInst(extra.rhs);
const operand_ty = sema.typeOf(operand);
@ -20746,7 +20775,7 @@ fn zirFloatFromInt(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileErro
const src = inst_data.src();
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = inst_data.src_node };
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@floatFromInt");
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu_opt, "@floatFromInt");
const operand = try sema.resolveInst(extra.rhs);
const operand_ty = sema.typeOf(operand);
@ -20775,7 +20804,7 @@ fn zirPtrFromInt(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!
const operand_res = try sema.resolveInst(extra.rhs);
const operand_coerced = try sema.coerce(block, Type.usize, operand_res, operand_src);
const ptr_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@ptrFromInt");
const ptr_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu, "@ptrFromInt");
try sema.checkPtrType(block, src, ptr_ty);
const elem_ty = ptr_ty.elemType2(mod);
const ptr_align = try ptr_ty.ptrAlignmentAdvanced(mod, sema);
@ -20833,7 +20862,7 @@ fn zirErrSetCast(sema: *Sema, block: *Block, extended: Zir.Inst.Extended.InstDat
const extra = sema.code.extraData(Zir.Inst.BinNode, extended.operand).data;
const src = LazySrcLoc.nodeOffset(extra.node);
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = extra.node };
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@errSetCast");
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu_opt, "@errSetCast");
const operand = try sema.resolveInst(extra.rhs);
const operand_ty = sema.typeOf(operand);
try sema.checkErrorSetType(block, src, dest_ty);
@ -20915,12 +20944,12 @@ fn zirErrSetCast(sema: *Sema, block: *Block, extended: Zir.Inst.Extended.InstDat
}
fn zirPtrCastFull(sema: *Sema, block: *Block, extended: Zir.Inst.Extended.InstData) CompileError!Air.Inst.Ref {
const flags = @as(Zir.Inst.FullPtrCastFlags, @bitCast(@as(u5, @truncate(extended.small))));
const flags: Zir.Inst.FullPtrCastFlags = @bitCast(@as(u5, @truncate(extended.small)));
const extra = sema.code.extraData(Zir.Inst.BinNode, extended.operand).data;
const src = LazySrcLoc.nodeOffset(extra.node);
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = extra.node };
const operand_src: LazySrcLoc = .{ .node_offset_ptrcast_operand = extra.node };
const operand = try sema.resolveInst(extra.rhs);
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@ptrCast"); // TODO: better error message (builtin name)
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu, flags.needResultTypeBuiltinName());
return sema.ptrCastFull(
block,
flags,
@ -20936,7 +20965,7 @@ fn zirPtrCast(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air
const src = inst_data.src();
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = inst_data.src_node };
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@ptrCast");
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu, "@ptrCast");
const operand = try sema.resolveInst(extra.rhs);
return sema.ptrCastFull(
@ -21325,7 +21354,7 @@ fn zirPtrCastNoDest(sema: *Sema, block: *Block, extended: Zir.Inst.Extended.Inst
const flags = @as(Zir.Inst.FullPtrCastFlags, @bitCast(@as(u5, @truncate(extended.small))));
const extra = sema.code.extraData(Zir.Inst.UnNode, extended.operand).data;
const src = LazySrcLoc.nodeOffset(extra.node);
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = extra.node };
const operand_src: LazySrcLoc = .{ .node_offset_ptrcast_operand = extra.node };
const operand = try sema.resolveInst(extra.operand);
const operand_ty = sema.typeOf(operand);
try sema.checkPtrOperand(block, operand_src, operand_ty);
@ -21349,7 +21378,7 @@ fn zirTruncate(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Ai
const src = inst_data.src();
const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = inst_data.src_node };
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, "@truncate");
const dest_ty = try sema.resolveCastDestType(block, src, extra.lhs, .remove_eu_opt, "@truncate");
const dest_scalar_ty = try sema.checkIntOrVectorAllowComptime(block, dest_ty, src);
const operand = try sema.resolveInst(extra.rhs);
const operand_ty = sema.typeOf(operand);

7
src/Zir.zig
View file

@ -2820,6 +2820,13 @@ pub const Inst = struct {
addrspace_cast: bool = false,
const_cast: bool = false,
volatile_cast: bool = false,
pub inline fn needResultTypeBuiltinName(flags: FullPtrCastFlags) []const u8 {
if (flags.ptr_cast) return "@ptrCast";
if (flags.align_cast) return "@alignCast";
if (flags.addrspace_cast) return "@addrSpaceCast";
unreachable;
}
};
/// Trailing:

122
test/behavior/cast.zig
View file

@ -2219,3 +2219,125 @@ test "peer type resolution: pointer attributes are combined correctly" {
try expectEqualSlices(u8, std.mem.span(@volatileCast(r2)), "bar");
try expectEqualSlices(u8, std.mem.span(@volatileCast(r3)), "baz");
}
test "cast builtins can wrap result in optional" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest; // TODO
const S = struct {
const MyEnum = enum(u32) { _ };
fn a() ?MyEnum {
return @enumFromInt(123);
}
fn b() ?u32 {
return @intFromFloat(42.50);
}
fn c() ?*const f32 {
const x: u32 = 1;
return @ptrCast(&x);
}
fn doTheTest() !void {
const ra = a() orelse return error.ImpossibleError;
const rb = b() orelse return error.ImpossibleError;
const rc = c() orelse return error.ImpossibleError;
comptime assert(@TypeOf(ra) == MyEnum);
comptime assert(@TypeOf(rb) == u32);
comptime assert(@TypeOf(rc) == *const f32);
try expect(@intFromEnum(ra) == 123);
try expect(rb == 42);
try expect(@as(*const u32, @ptrCast(rc)).* == 1);
}
};
try S.doTheTest();
try comptime S.doTheTest();
}
test "cast builtins can wrap result in error union" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest; // TODO
const S = struct {
const MyEnum = enum(u32) { _ };
const E = error{ImpossibleError};
fn a() E!MyEnum {
return @enumFromInt(123);
}
fn b() E!u32 {
return @intFromFloat(42.50);
}
fn c() E!*const f32 {
const x: u32 = 1;
return @ptrCast(&x);
}
fn doTheTest() !void {
const ra = try a();
const rb = try b();
const rc = try c();
comptime assert(@TypeOf(ra) == MyEnum);
comptime assert(@TypeOf(rb) == u32);
comptime assert(@TypeOf(rc) == *const f32);
try expect(@intFromEnum(ra) == 123);
try expect(rb == 42);
try expect(@as(*const u32, @ptrCast(rc)).* == 1);
}
};
try S.doTheTest();
try comptime S.doTheTest();
}
test "cast builtins can wrap result in error union and optional" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest; // TODO
const S = struct {
const MyEnum = enum(u32) { _ };
const E = error{ImpossibleError};
fn a() E!?MyEnum {
return @enumFromInt(123);
}
fn b() E!?u32 {
return @intFromFloat(42.50);
}
fn c() E!?*const f32 {
const x: u32 = 1;
return @ptrCast(&x);
}
fn doTheTest() !void {
const ra = try a() orelse return error.ImpossibleError;
const rb = try b() orelse return error.ImpossibleError;
const rc = try c() orelse return error.ImpossibleError;
comptime assert(@TypeOf(ra) == MyEnum);
comptime assert(@TypeOf(rb) == u32);
comptime assert(@TypeOf(rc) == *const f32);
try expect(@intFromEnum(ra) == 123);
try expect(rb == 42);
try expect(@as(*const u32, @ptrCast(rc)).* == 1);
}
};
try S.doTheTest();
try comptime S.doTheTest();
}

28
test/cases/compile_errors/cast_without_result_type.zig Normal file
View file

@ -0,0 +1,28 @@
export fn a() void {
_ = @ptrFromInt(123);
}
export fn b() void {
const x = @ptrCast(@alignCast(@as(*u8, undefined)));
_ = x;
}
export fn c() void {
_ = &@intCast(@as(u64, 123));
_ = S;
}
export fn d() void {
var x: f32 = 0;
_ = x + @floatFromInt(123);
}
// error
// backend=stage2
// target=native
//
// :2:9: error: @ptrFromInt must have a known result type
// :2:9: note: use @as to provide explicit result type
// :5:15: error: @ptrCast must have a known result type
// :5:15: note: use @as to provide explicit result type
// :9:10: error: @intCast must have a known result type
// :9:10: note: use @as to provide explicit result type
// :14:13: error: @floatFromInt must have a known result type
// :14:13: note: use @as to provide explicit result type

31
test/cases/compile_errors/cast_without_result_type_due_to_generic_parameter.zig Normal file
View file

@ -0,0 +1,31 @@
export fn a() void {
bar(@ptrFromInt(123));
}
export fn b() void {
bar(@ptrCast(@alignCast(@as(*u8, undefined))));
}
export fn c() void {
bar(@intCast(@as(u64, 123)));
}
export fn d() void {
bar(@floatFromInt(123));
}
fn bar(_: anytype) void {}
// error
// backend=stage2
// target=native
//
// :2:9: error: @ptrFromInt must have a known result type
// :2:9: note: result type is unknown due to anytype parameter
// :2:9: note: use @as to provide explicit result type
// :5:9: error: @ptrCast must have a known result type
// :5:9: note: result type is unknown due to anytype parameter
// :5:9: note: use @as to provide explicit result type
// :8:9: error: @intCast must have a known result type
// :8:9: note: result type is unknown due to anytype parameter
// :8:9: note: use @as to provide explicit result type
// :11:9: error: @floatFromInt must have a known result type
// :11:9: note: result type is unknown due to anytype parameter
// :11:9: note: use @as to provide explicit result type

22
test/cases/compile_errors/nested_ptr_cast_bad_operand.zig Normal file
View file

@ -0,0 +1,22 @@
const p: ?*const u8 = null;
export fn a() void {
_ = @as(*const u32, @ptrCast(@alignCast(p)));
}
export fn b() void {
_ = @constCast(@volatileCast(123));
}
export fn c() void {
const x: ?*f32 = @constCast(@ptrCast(@addrSpaceCast(@volatileCast(p))));
_ = x;
}
// error
// backend=stage2
// target=native
//
// :3:45: error: null pointer casted to type '*const u32'
// :6:34: error: expected pointer type, found 'comptime_int'
// :9:22: error: cast increases pointer alignment
// :9:71: note: '?*const u8' has alignment '1'
// :9:22: note: '?*f32' has alignment '4'
// :9:22: note: use @alignCast to assert pointer alignment

19
test/cases/compile_errors/redundant_ptr_cast.zig Normal file
View file

@ -0,0 +1,19 @@
const p: *anyopaque = undefined;
export fn a() void {
_ = @ptrCast(@ptrCast(p));
}
export fn b() void {
const ptr1: *u32 = @alignCast(@ptrCast(@alignCast(p)));
_ = ptr1;
}
export fn c() void {
_ = @constCast(@alignCast(@ptrCast(@constCast(@volatileCast(p)))));
}
// error
// backend=stage2
// target=native
//
// :3:18: error: redundant @ptrCast
// :6:44: error: redundant @alignCast
// :10:40: error: redundant @constCast