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Implement offsetOf builtin function

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This commit is contained in:
Jimmi Holst Christensen 2022-01-08 13:00:49 +01:00
parent 3f586781b6
commit d8d5e2d4b9
2 changed files with 38 additions and 4 deletions
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32
src/Sema.zig
View File

@ -11000,8 +11000,36 @@ fn zirBitOffsetOf(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError
fn zirOffsetOf(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.Inst.Ref {
const inst_data = sema.code.instructions.items(.data)[inst].pl_node;
const src = inst_data.src();
return sema.fail(block, src, "TODO: Sema.zirOffsetOf", .{});
sema.src = .{ .node_offset_bin_op = inst_data.src_node };
const lhs_src: LazySrcLoc = .{ .node_offset_bin_lhs = inst_data.src_node };
const rhs_src: LazySrcLoc = .{ .node_offset_bin_rhs = inst_data.src_node };
const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
const ty = try sema.resolveType(block, lhs_src, extra.lhs);
const field_name = try sema.resolveConstString(block, rhs_src, extra.rhs);
try sema.resolveTypeLayout(block, lhs_src, ty);
if (ty.tag() != .@"struct") {
return sema.fail(
block,
lhs_src,
"expected struct type, found '{}'",
.{ty},
);
}
const index = ty.structFields().getIndex(field_name) orelse {
return sema.fail(
block,
rhs_src,
"struct '{}' has no field '{s}'",
.{ ty, field_name },
);
};
const target = sema.mod.getTarget();
const offset = ty.structFieldOffset(index, target);
return sema.addIntUnsigned(Type.comptime_int, offset);
}
/// Returns `true` if the type was a comptime_int.

10
src/type.zig
View File

@ -3777,7 +3777,10 @@ pub const Type = extern union {
var offset: u64 = 0;
var big_align: u32 = 0;
for (struct_obj.fields.values()) |field, i| {
if (!field.ty.hasCodeGenBits()) continue;
if (!field.ty.hasCodeGenBits()) {
if (i == index) return offset;
continue;
}
const field_align = field.normalAlignment(target);
big_align = @maximum(big_align, field_align);
@ -3794,7 +3797,10 @@ pub const Type = extern union {
var big_align: u32 = 0;
var running_bits: u16 = 0;
for (struct_obj.fields.values()) |field, i| {
if (!field.ty.hasCodeGenBits()) continue;
if (!field.ty.hasCodeGenBits()) {
if (i == index) return offset;
continue;
}
const field_align = field.packedAlignment();
if (field_align == 0) {