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const std = @import("std");
const StaticExport = @import("./static_export.zig");
const Sizes = @import("./sizes.zig");
const is_bindgen: bool = std.meta.globalOption("bindgen", bool) orelse false;
pub fn Shimmer(comptime _namespace: []const u8, comptime _name: []const u8, comptime Parent: type) type {
return struct {
pub const namespace = _namespace;
pub const name = _name;
fn toCppType(comptime FromType: ?type) ?type {
return comptime brk: {
var NewReturnType = FromType orelse c_void;
if (NewReturnType == c_void) {
break :brk FromType;
}
var ReturnTypeInfo: std.builtin.TypeInfo = @typeInfo(FromType orelse c_void);
if (ReturnTypeInfo == .Pointer and NewReturnType != *c_void) {
NewReturnType = ReturnTypeInfo.Pointer.child;
ReturnTypeInfo = @typeInfo(NewReturnType);
}
switch (ReturnTypeInfo) {
.Union,
.Struct,
.Enum,
=> {
if (@hasDecl(ReturnTypeInfo, "Type")) {
break :brk NewReturnType;
}
},
else => {},
}
break :brk FromType;
};
}
pub const align_of_symbol = std.fmt.comptimePrint("{s}__{s}_object_align_", .{ namespace, name });
pub const size_of_symbol = std.fmt.comptimePrint("{s}__{s}_object_size_", .{ namespace, name });
pub const byte_size = brk: {
const identifier = std.fmt.comptimePrint("{s}__{s}", .{ namespace, name });
const align_symbol = std.fmt.comptimePrint("{s}__{s}_align", .{ namespace, name });
if (@hasDecl(Sizes, identifier)) {
break :brk @field(Sizes, identifier); //+ @field(Sizes, align_symbol);
} else {
break :brk 0;
}
};
pub const Bytes = [byte_size]u8;
pub inline fn getConvertibleType(comptime ZigType: type) type {
if (@typeInfo(ZigType) == .Struct) {
const Struct: std.builtin.TypeInfo.Struct = ChildType.Struct;
for (Struct.fields) |field| {
if (std.mem.eql(u8, field.name, "ref")) {
return field.field_type;
}
}
}
return ZigType;
}
fn pointerChild(comptime Type: type) type {
if (@typeInfo(Type) == .Pointer) {
return @typeInfo(Type).Pointer.child_type;
}
return Type;
}
pub inline fn toZigType(comptime ZigType: type, comptime CppType: type, value: CppType) *ZigType {
if (comptime hasRef(ZigType)) {
// *WTF::String => Wtf.String{ = value}, via casting instead of copying
if (comptime @typeInfo(CppType) == .Pointer and @typeInfo(ZigType) != .Pointer) {
return @bitCast(ZigType, @ptrToInt(value));
}
}
return @as(ZigType, value);
}
pub fn symbolName(comptime typeName: []const u8) []const u8 {
return comptime std.fmt.comptimePrint("{s}__{s}__{s}", .{ namespace, name, typeName });
}
pub fn exportFunctions(comptime Functions: anytype) [std.meta.fieldNames(@TypeOf(Functions)).len]StaticExport {
const FunctionsType = @TypeOf(Functions);
return comptime brk: {
var functions: [std.meta.fieldNames(FunctionsType).len]StaticExport = undefined;
for (std.meta.fieldNames(FunctionsType)) |fn_name, i| {
const Function = @TypeOf(@field(Functions, fn_name));
if (@typeInfo(Function) != .Fn) {
@compileError("Expected " ++ @typeName(Parent) ++ "." ++ @typeName(Function) ++ " to be a function but received " ++ @tagName(@typeInfo(Function)));
}
var Fn: std.builtin.TypeInfo.Fn = @typeInfo(Function).Fn;
if (Fn.calling_convention != .C) {
@compileError("Expected " ++ @typeName(Parent) ++ "." ++ @typeName(Function) ++ " to have a C Calling Convention.");
}
const export_name = symbolName(fn_name);
functions[i] = StaticExport{
.Type = Function,
.symbol_name = export_name,
.local_name = fn_name,
.Parent = Parent,
};
}
break :brk functions;
};
}
pub inline fn zigFn(comptime typeName: []const u8, args: anytype) (@typeInfo(@TypeOf(@field(Parent, typeName))).Fn.return_type orelse void) {
const identifier = symbolName(typeName);
const func = comptime @typeInfo(Parent).Struct.fields[std.meta.fieldIndex(Parent, typeName)].field_type;
const ReturnType = comptime @typeInfo(func).Fn.return_type orelse c_void;
const Func: type = comptime brk: {
var FuncType: std.builtin.TypeInfo = @typeInfo(@TypeOf(func));
var Fn: std.builtin.TypeInfo.Fn = FuncType.Fn;
Fn.calling_convention = std.builtin.CallingConvention.C;
Fn.return_type = toCppType(Fn.return_type);
const ArgsType = @TypeOf(args);
for (std.meta.fieldNames(args)) |field, i| {
Fn.args[i] = std.builtin.TypeInfo.FnArg{
.is_generic = false,
.is_noalias = false,
.arg_type = @typeInfo(ArgsType).fields[i].field_type,
};
}
FuncType.Fn = Fn;
break :brk @Type(FuncType);
};
comptime @export(Func, .{ .name = identifier });
unreachable;
}
pub inline fn cppFn(comptime typeName: []const u8, args: anytype) (ret: {
if (!@hasDecl(Parent, typeName)) {
@compileError(@typeName(Parent) ++ " is missing cppFn: " ++ typeName);
}
break :ret std.meta.declarationInfo(Parent, typeName).data.Fn.return_type;
}) {
if (comptime is_bindgen) {
unreachable;
} else {
const identifier = comptime std.fmt.comptimePrint("{s}__{s}__{s}", .{ namespace, name, typeName });
const func = comptime @typeInfo(Parent).Struct.fields[std.meta.fieldIndex(Parent, typeName)].field_type;
const ReturnType = comptime @typeInfo(func).Fn.return_type orelse c_void;
const Func: type = comptime brk: {
var FuncType: std.builtin.TypeInfo = @typeInfo(@TypeOf(func));
var Fn: std.builtin.TypeInfo.Fn = FuncType.Fn;
Fn.calling_convention = std.builtin.CallingConvention.C;
Fn.return_type = toCppType(Fn.return_type);
const ArgsType = @TypeOf(args);
for (std.meta.fieldNames(args)) |field, i| {
Fn.args[i] = std.builtin.TypeInfo.FnArg{
.is_generic = false,
.is_noalias = false,
.arg_type = @typeInfo(ArgsType).fields[i].field_type,
};
}
FuncType.Fn = Fn;
break :brk @Type(FuncType);
};
const Outgoing = comptime @extern(Func, std.builtin.ExternOptions{ .name = identifier });
return toZigType(
ReturnType,
@typeInfo(Func).Fn.return_type orelse void,
@call(.{}, Outgoing, args),
);
}
}
};
}
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