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cbe: implement field_parent_ptr

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This commit is contained in:
Jacob Young 2022-10-24 21:22:28 -04:00
parent 361035fe7a
commit 54326cc554
2 changed files with 41 additions and 12 deletions
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51
src/codegen/c.zig
View File

@ -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)});

2
test/behavior/field_parent_ptr.zig
View File

@ -4,7 +4,6 @@ const builtin = @import("builtin");
test "@fieldParentPtr non-first field" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
try testParentFieldPtr(&foo.c);
comptime try testParentFieldPtr(&foo.c);
}
@ -12,7 +11,6 @@ test "@fieldParentPtr non-first field" {
test "@fieldParentPtr first field" {
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest;
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
try testParentFieldPtrFirst(&foo.a);
comptime try testParentFieldPtrFirst(&foo.a);
}