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const std = @import("std");
const StaticExport = @import("./static_export.zig");
const Sizes = @import("./sizes.zig");
pub const is_bindgen: bool = std.meta.globalOption("bindgen", bool) orelse false;
const headers = @import("./headers.zig");
fn isNullableType(comptime Type: type) bool {
return @typeInfo(Type) == .Optional;
}
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 {
// var NewReturnType = FromType;
// if (NewReturnType == anyopaque) {
// return FromType;
// }
// var ReturnTypeInfo: std.builtin.TypeInfo = @typeInfo(FromType);
// if (ReturnTypeInfo == .Pointer and NewReturnType != *anyopaque) {
// NewReturnType = ReturnTypeInfo.Pointer.child;
// ReturnTypeInfo = @typeInfo(NewReturnType);
// }
// switch (ReturnTypeInfo) {
// .Union,
// .Struct,
// .Enum,
// => {
// if (@hasDecl(ReturnTypeInfo., "Type")) {
// return NewReturnType;
// }
// },
// else => {},
// }
// return 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 });
const align_symbol = std.fmt.comptimePrint("{s}__{s}_align", .{ namespace, name });
pub const byte_size = brk: {
const identifier = std.fmt.comptimePrint("{s}__{s}", .{ namespace, name });
if (@hasDecl(Sizes, identifier)) {
break :brk @field(Sizes, identifier);
} else {
break :brk 0;
}
};
pub const align_size = brk: {
const identifier = std.fmt.comptimePrint("{s}__{s}_align", .{ namespace, name });
if (@hasDecl(Sizes, identifier)) {
break :brk @field(Sizes, identifier);
} else {
break :brk 0;
}
};
pub const Bytes = if (byte_size > 16) [byte_size]u8 else std.meta.Int(.unsigned, byte_size * 8);
pub const Return = struct {
pub const Type = Parent;
pub const is_return = true;
};
fn pointerChild(comptime Type: type) type {
if (@typeInfo(Type) == .Pointer) {
return @typeInfo(Type).Pointer.child_type;
}
return Type;
}
pub fn symbolName(comptime typeName: []const u8) []const u8 {
if (comptime namespace.len > 0) {
return comptime std.fmt.comptimePrint("{s}__{s}__{s}", .{ namespace, name, typeName });
} else {
return comptime std.fmt.comptimePrint("{s}__{s}", .{ 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 matchNullable(comptime ExpectedReturnType: type, comptime ExternReturnType: type, value: ExternReturnType) ExpectedReturnType {
if (comptime isNullableType(ExpectedReturnType) != isNullableType(ExternReturnType)) {
return value.?;
} else if (comptime (@typeInfo(ExpectedReturnType) == .Enum) and (@typeInfo(ExternReturnType) != .Enum)) {
return @intToEnum(ExpectedReturnType, value);
} else {
return value;
}
}
pub inline fn cppFn(comptime typeName: []const u8, args: anytype) (ret: {
@setEvalBranchQuota(99999);
if (!@hasDecl(Parent, typeName)) {
@compileError(@typeName(Parent) ++ " is missing cppFn: " ++ typeName);
}
break :ret std.meta.declarationInfo(Parent, typeName).data.Fn.return_type;
}) {
@setEvalBranchQuota(99999);
if (comptime is_bindgen) {
unreachable;
} else {
const Fn = comptime @field(headers, symbolName(typeName));
return matchNullable(
comptime std.meta.declarationInfo(Parent, typeName).data.Fn.return_type,
comptime @typeInfo(@TypeOf(Fn)).Fn.return_type.?,
@call(.{}, Fn, args),
);
}
}
};
}
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