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stage2 ARM: implement field_parent_ptr

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joachimschmidt557 2022-08-26 22:19:27 +02:00
parent 481bd4761a
commit e2b029e2c8
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2 changed files with 18 additions and 5 deletions
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21
src/arch/arm/CodeGen.zig
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@ -2681,9 +2681,24 @@ fn airStructFieldVal(self: *Self, inst: Air.Inst.Index) !void {
fn airFieldParentPtr(self: *Self, inst: Air.Inst.Index) !void {
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const bin_op = self.air.extraData(Air.Bin, ty_pl.payload).data;
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else return self.fail("TODO implement airFieldParentPtr", .{});
return self.finishAir(inst, result, .{ bin_op.lhs, bin_op.rhs, .none });
const extra = self.air.extraData(Air.FieldParentPtr, ty_pl.payload).data;
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else result: {
const field_ptr = try self.resolveInst(extra.field_ptr);
const struct_ty = self.air.getRefType(ty_pl.ty).childType();
const struct_field_offset = @intCast(u32, struct_ty.structFieldOffset(extra.field_index, self.target.*));
switch (field_ptr) {
.ptr_stack_offset => |off| {
break :result MCValue{ .ptr_stack_offset = off + struct_field_offset };
},
else => {
const lhs_bind: ReadArg.Bind = .{ .mcv = field_ptr };
const rhs_bind: ReadArg.Bind = .{ .mcv = .{ .immediate = struct_field_offset } };
break :result try self.addSub(.sub, lhs_bind, rhs_bind, Type.usize, Type.usize, null);
},
}
};
return self.finishAir(inst, result, .{ extra.field_ptr, .none, .none });
}
/// An argument to a Mir instruction which is read (and possibly also

2
test/behavior/field_parent_ptr.zig
View File

@ -2,7 +2,6 @@ const expect = @import("std").testing.expect;
const builtin = @import("builtin");
test "@fieldParentPtr non-first field" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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;
@ -11,7 +10,6 @@ test "@fieldParentPtr non-first field" {
}
test "@fieldParentPtr first field" {
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
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;