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wasm: Implement opt_payload_ptr

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Implements lowering constants for pointers of value 'opt_payload_ptr'.
The offset is calculated by determining the abi size of the full type and
then substracting the payload size.
This commit is contained in:
Luuk de Gram 2022-03-23 18:33:48 +01:00
parent a9a629f89a
commit 685f05b562
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GPG Key ID: A8CFE58E4DC7D664
1 changed files with 18 additions and 1 deletions
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19
src/arch/wasm/CodeGen.zig
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@ -1886,6 +1886,23 @@ fn lowerParentPtr(self: *Self, ptr_val: Value, ptr_child_ty: Type) InnerError!WV
.offset = @intCast(u32, offset),
} };
},
.opt_payload_ptr => {
const payload_ptr = ptr_val.castTag(.opt_payload_ptr).?.data;
const parent_ptr = try self.lowerParentPtr(payload_ptr.container_ptr, payload_ptr.container_ty);
var buf: Type.Payload.ElemType = undefined;
const payload_ty = payload_ptr.container_ty.optionalChild(&buf);
if (!payload_ty.hasRuntimeBitsIgnoreComptime() or payload_ty.isPtrLikeOptional()) {
return parent_ptr;
}
const abi_size = payload_ptr.container_ty.abiSize(self.target);
const offset = abi_size - payload_ty.abiSize(self.target);
return WValue{ .memory_offset = .{
.pointer = parent_ptr.memory,
.offset = @intCast(u32, offset),
} };
},
else => |tag| return self.fail("TODO: Implement lowerParentPtr for tag: {}", .{tag}),
}
}
@ -1948,7 +1965,7 @@ fn lowerConstant(self: *Self, val: Value, ty: Type) InnerError!WValue {
else => unreachable,
},
.Pointer => switch (val.tag()) {
.field_ptr, .elem_ptr => {
.field_ptr, .elem_ptr, .opt_payload_ptr => {
return self.lowerParentPtr(val, ty.childType());
},
.int_u64, .one => return WValue{ .imm32 = @intCast(u32, val.toUnsignedInt(target)) },