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Merge pull request #12198 from Vexu/stage2

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Sema: fix loading and storing of optional pointers represented as pointers
This commit is contained in:
Andrew Kelley 2022-07-22 20:47:40 -07:00 committed by GitHub
commit f591936480
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7 changed files with 145 additions and 18 deletions
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62
src/Sema.zig
View File

@ -1663,11 +1663,15 @@ fn resolveMaybeUndefValIntable(
inst: Air.Inst.Ref,
) CompileError!?Value {
const val = (try sema.resolveMaybeUndefValAllowVariables(block, src, inst)) orelse return null;
switch (val.tag()) {
.variable, .decl_ref, .decl_ref_mut => return null,
var check = val;
while (true) switch (check.tag()) {
.variable, .decl_ref, .decl_ref_mut, .comptime_field_ptr => return null,
.field_ptr => check = check.castTag(.field_ptr).?.data.container_ptr,
.elem_ptr => check = check.castTag(.elem_ptr).?.data.array_ptr,
.eu_payload_ptr, .opt_payload_ptr => check = check.cast(Value.Payload.PayloadPtr).?.data.container_ptr,
.generic_poison => return error.GenericPoison,
else => return val,
}
};
}
/// Returns all Value tags including `variable` and `undef`.
@ -3871,9 +3875,15 @@ fn zirValidateArrayInit(
const array_len = array_ty.arrayLen();
if (instrs.len != array_len) {
return sema.fail(block, init_src, "expected {d} array elements; found {d}", .{
array_len, instrs.len,
});
if (array_ty.zigTypeTag() == .Array) {
return sema.fail(block, init_src, "expected {d} array elements; found {d}", .{
array_len, instrs.len,
});
} else {
return sema.fail(block, init_src, "expected {d} vector elements; found {d}", .{
array_len, instrs.len,
});
}
}
if ((is_comptime or block.is_comptime) and
@ -7893,7 +7903,7 @@ fn zirPtrToInt(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Ai
if (!ptr_ty.isPtrAtRuntime()) {
return sema.fail(block, ptr_src, "expected pointer, found '{}'", .{ptr_ty.fmt(sema.mod)});
}
if (try sema.resolveMaybeUndefVal(block, ptr_src, ptr)) |ptr_val| {
if (try sema.resolveMaybeUndefValIntable(block, ptr_src, ptr)) |ptr_val| {
return sema.addConstant(Type.usize, ptr_val);
}
try sema.requireRuntimeBlock(block, ptr_src, ptr_src);
@ -14261,7 +14271,7 @@ fn zirStructInitEmpty(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileE
switch (obj_ty.zigTypeTag()) {
.Struct => return sema.structInitEmpty(block, obj_ty, src, src),
.Array => return arrayInitEmpty(sema, obj_ty),
.Array, .Vector => return sema.arrayInitEmpty(block, src, obj_ty),
.Void => return sema.addConstant(obj_ty, Value.void),
else => return sema.failWithArrayInitNotSupported(block, src, obj_ty),
}
@ -14286,7 +14296,15 @@ fn structInitEmpty(
return sema.finishStructInit(block, init_src, dest_src, field_inits, struct_ty, false);
}
fn arrayInitEmpty(sema: *Sema, obj_ty: Type) CompileError!Air.Inst.Ref {
fn arrayInitEmpty(sema: *Sema, block: *Block, src: LazySrcLoc, obj_ty: Type) CompileError!Air.Inst.Ref {
const arr_len = obj_ty.arrayLen();
if (arr_len != 0) {
if (obj_ty.zigTypeTag() == .Array) {
return sema.fail(block, src, "expected {d} array elements; found 0", .{arr_len});
} else {
return sema.fail(block, src, "expected {d} vector elements; found 0", .{arr_len});
}
}
if (obj_ty.sentinel()) |sentinel| {
const val = try Value.Tag.empty_array_sentinel.create(sema.arena, sentinel);
return sema.addConstant(obj_ty, val);
@ -19448,7 +19466,7 @@ fn fieldCallBind(
const raw_ptr_src = src; // TODO better source location
const raw_ptr_ty = sema.typeOf(raw_ptr);
const inner_ty = if (raw_ptr_ty.zigTypeTag() == .Pointer and raw_ptr_ty.ptrSize() == .One)
const inner_ty = if (raw_ptr_ty.zigTypeTag() == .Pointer and (raw_ptr_ty.ptrSize() == .One or raw_ptr_ty.ptrSize() == .C))
raw_ptr_ty.childType()
else
return sema.fail(block, raw_ptr_src, "expected single pointer, found '{}'", .{raw_ptr_ty.fmt(sema.mod)});
@ -20974,7 +20992,7 @@ fn coerceExtra(
.Vector => return sema.coerceArrayLike(block, dest_ty, dest_ty_src, inst, inst_src),
.Struct => {
if (inst == .empty_struct) {
return arrayInitEmpty(sema, dest_ty);
return sema.arrayInitEmpty(block, inst_src, dest_ty);
}
if (inst_ty.isTuple()) {
return sema.coerceTupleToArray(block, dest_ty, dest_ty_src, inst, inst_src);
@ -22607,7 +22625,9 @@ fn beginComptimePtrMutation(
}
},
.opt_payload_ptr => {
const opt_ptr = ptr_val.castTag(.opt_payload_ptr).?.data;
const opt_ptr = if (ptr_val.castTag(.opt_payload_ptr)) |some| some.data else {
return sema.beginComptimePtrMutation(block, src, ptr_val, try ptr_elem_ty.optionalChildAlloc(sema.arena));
};
var parent = try beginComptimePtrMutation(sema, block, src, opt_ptr.container_ptr, opt_ptr.container_ty);
switch (parent.pointee) {
.direct => |val_ptr| {
@ -22640,7 +22660,11 @@ fn beginComptimePtrMutation(
.ty = payload_ty,
},
else => unreachable,
else => return ComptimePtrMutationKit{
.decl_ref_mut = parent.decl_ref_mut,
.pointee = .{ .direct = val_ptr },
.ty = payload_ty,
},
}
},
.bad_decl_ty, .bad_ptr_ty => return parent,
@ -22922,8 +22946,13 @@ fn beginComptimePtrLoad(
(try sema.coerceInMemoryAllowed(block, tv.ty, payload_ptr.container_ty, false, target, src, src)) == .ok;
if (coerce_in_mem_ok) {
const payload_val = switch (ptr_val.tag()) {
.eu_payload_ptr => tv.val.castTag(.eu_payload).?.data,
.opt_payload_ptr => tv.val.castTag(.opt_payload).?.data,
.eu_payload_ptr => if (tv.val.castTag(.eu_payload)) |some| some.data else {
return sema.fail(block, src, "attempt to unwrap error: {s}", .{tv.val.castTag(.@"error").?.data.name});
},
.opt_payload_ptr => if (tv.val.castTag(.opt_payload)) |some| some.data else opt: {
if (tv.val.isNull()) return sema.fail(block, src, "attempt to use null value", .{});
break :opt tv.val;
},
else => unreachable,
};
tv.* = TypedValue{ .ty = payload_ty, .val = payload_val };
@ -22933,6 +22962,9 @@ fn beginComptimePtrLoad(
deref.pointee = null;
break :blk deref;
},
.null_value => {
return sema.fail(block, src, "attempt to use null value", .{});
},
.zero,
.one,

5
src/codegen/c.zig
View File

@ -3618,8 +3618,9 @@ fn airIsErr(
const operand = try f.resolveInst(un_op);
const operand_ty = f.air.typeOf(un_op);
const local = try f.allocLocal(Type.initTag(.bool), .Const);
const payload_ty = operand_ty.errorUnionPayload();
const error_ty = operand_ty.errorUnionSet();
const err_union_ty = if (is_ptr) operand_ty.childType() else operand_ty;
const payload_ty = err_union_ty.errorUnionPayload();
const error_ty = err_union_ty.errorUnionSet();
try writer.writeAll(" = ");

3
src/codegen/llvm.zig
View File

@ -5697,7 +5697,8 @@ pub const FuncGen = struct {
const un_op = self.air.instructions.items(.data)[inst].un_op;
const operand = try self.resolveInst(un_op);
const err_union_ty = self.air.typeOf(un_op);
const operand_ty = self.air.typeOf(un_op);
const err_union_ty = if (operand_is_ptr) operand_ty.childType() else operand_ty;
const payload_ty = err_union_ty.errorUnionPayload();
const err_set_ty = try self.dg.lowerType(Type.initTag(.anyerror));
const zero = err_set_ty.constNull();

12
test/behavior/error.zig
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@ -724,3 +724,15 @@ test "simple else prong allowed even when all errors handled" {
};
try expect(value == 255);
}
test {
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_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
var err_union: anyerror!u8 = 15;
const payload_ptr = &(err_union catch unreachable);
try expect(payload_ptr.* == 15);
}

21
test/behavior/eval.zig
View File

@ -1272,3 +1272,24 @@ test "continue nested in a conditional in an inline for" {
}
try expect(x == 0);
}
test "optional pointer represented as a pointer value" {
comptime {
var val: u8 = 15;
const opt_ptr: ?*u8 = &val;
const payload_ptr = &opt_ptr.?;
try expect(payload_ptr.*.* == 15);
}
}
test "mutate through pointer-like optional at comptime" {
comptime {
var val: u8 = 15;
var opt_ptr: ?*const u8 = &val;
const payload_ptr = &opt_ptr.?;
payload_ptr.* = &@as(u8, 16);
try expect(payload_ptr.*.* == 16);
}
}

27
test/cases/compile_errors/array_init_invalid_elem_count.zig Normal file
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@ -0,0 +1,27 @@
const V = @Vector(8, u8);
const A = [8]u8;
comptime {
var v: V = V{1};
_ = v;
}
comptime {
var v: V = V{};
_ = v;
}
comptime {
var a: A = A{1};
_ = a;
}
comptime {
var a: A = A{};
_ = a;
}
// error
// backend=stage2
// target=native
//
// :4:17: error: expected 8 vector elements; found 1
// :8:17: error: expected 8 vector elements; found 0
// :12:17: error: expected 8 array elements; found 1
// :16:17: error: expected 8 array elements; found 0

33
test/cases/compile_errors/dereferencing_invalid_payload_ptr_at_comptime.zig Normal file
View File

@ -0,0 +1,33 @@
const std = @import("std");
comptime {
var val: u8 = 15;
var opt_ptr: ?*const u8 = &val;
const payload_ptr = &opt_ptr.?;
opt_ptr = null;
_ = payload_ptr.*.*;
}
comptime {
var opt: ?u8 = 15;
const payload_ptr = &opt.?;
opt = null;
_ = payload_ptr.*;
}
comptime {
var val: u8 = 15;
var err_union: anyerror!u8 = val;
const payload_ptr = &(err_union catch unreachable);
err_union = error.Foo;
_ = payload_ptr.*;
}
// error
// backend=stage2
// target=native
//
// :9:20: error: attempt to use null value
// :16:20: error: attempt to use null value
// :24:20: error: attempt to unwrap error: Foo