diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/codegen/c.zig | 51 |
1 files changed, 41 insertions, 10 deletions
diff --git a/src/codegen/c.zig b/src/codegen/c.zig index 897af5ef65..46215039c4 100644 --- a/src/codegen/c.zig +++ b/src/codegen/c.zig @@ -583,12 +583,12 @@ pub const DeclGen = struct { }; const byte_offset_val = Value.initPayload(&byte_offset_pl.base); - var ptr_u8_pl = ptr_info; - ptr_u8_pl.data.pointee_type = Type.u8; - const ptr_u8_ty = Type.initPayload(&ptr_u8_pl.base); + var u8_ptr_pl = ptr_info; + u8_ptr_pl.data.pointee_type = Type.u8; + const u8_ptr_ty = Type.initPayload(&u8_ptr_pl.base); try writer.writeAll("&(("); - try dg.renderTypecast(writer, ptr_u8_ty); + try dg.renderTypecast(writer, u8_ptr_ty); try writer.writeByte(')'); try dg.renderParentPtr(writer, field_ptr.container_ptr, container_ptr_ty); return writer.print(")[{}]", .{try dg.fmtIntLiteral(Type.usize, byte_offset_val)}); @@ -4050,8 +4050,39 @@ fn airStructFieldPtrIndex(f: *Function, inst: Air.Inst.Index, index: u8) !CValue } fn airFieldParentPtr(f: *Function, inst: Air.Inst.Index) !CValue { - _ = inst; - return f.fail("TODO: C backend: implement airFieldParentPtr", .{}); + if (f.liveness.isUnused(inst)) return CValue.none; + + const ty_pl = f.air.instructions.items(.data)[inst].ty_pl; + const extra = f.air.extraData(Air.FieldParentPtr, ty_pl.payload).data; + + const struct_ptr_ty = f.air.typeOfIndex(inst); + const field_ptr_ty = f.air.typeOf(extra.field_ptr); + const field_ptr_val = try f.resolveInst(extra.field_ptr); + + const target = f.object.dg.module.getTarget(); + const struct_ty = struct_ptr_ty.childType(); + const field_offset = struct_ty.structFieldOffset(extra.field_index, target); + + var field_offset_pl = Value.Payload.I64{ + .base = .{ .tag = .int_i64 }, + .data = -@intCast(i64, field_offset), + }; + const field_offset_val = Value.initPayload(&field_offset_pl.base); + + var u8_ptr_pl = field_ptr_ty.ptrInfo(); + u8_ptr_pl.data.pointee_type = Type.u8; + const u8_ptr_ty = Type.initPayload(&u8_ptr_pl.base); + + const writer = f.object.writer(); + const local = try f.allocLocal(struct_ptr_ty, .Const); + try writer.writeAll(" = ("); + try f.renderTypecast(writer, struct_ptr_ty); + try writer.writeAll(")&(("); + try f.renderTypecast(writer, u8_ptr_ty); + try writer.writeByte(')'); + try f.writeCValue(writer, field_ptr_val, .Other); + try writer.print(")[{}];\n", .{try f.fmtIntLiteral(Type.isize, field_offset_val)}); + return local; } fn structFieldPtr(f: *Function, inst: Air.Inst.Index, struct_ptr_ty: Type, struct_ptr: CValue, index: u32) !CValue { @@ -4089,12 +4120,12 @@ fn structFieldPtr(f: *Function, inst: Air.Inst.Index, struct_ptr_ty: Type, struc }; const byte_offset_val = Value.initPayload(&byte_offset_pl.base); - var ptr_u8_pl = field_ptr_info; - ptr_u8_pl.data.pointee_type = Type.u8; - const ptr_u8_ty = Type.initPayload(&ptr_u8_pl.base); + var u8_ptr_pl = field_ptr_info; + u8_ptr_pl.data.pointee_type = Type.u8; + const u8_ptr_ty = Type.initPayload(&u8_ptr_pl.base); try writer.writeAll("&(("); - try f.renderTypecast(writer, ptr_u8_ty); + try f.renderTypecast(writer, u8_ptr_ty); try writer.writeByte(')'); try f.writeCValue(writer, struct_ptr, .Other); try writer.print(")[{}];\n", .{try f.fmtIntLiteral(Type.usize, byte_offset_val)}); |