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Library Forwarding/wayland: For 32-bit guests, support repacking wl_interface/wl_message/wl_argument
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@ -167,6 +167,14 @@ struct guest_layout<T*> {
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const guest_layout<T>* get_pointer() const {
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return reinterpret_cast<const guest_layout<T>*>(uintptr_t { data });
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}
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T* force_get_host_pointer() {
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return reinterpret_cast<T*>(uintptr_t { data });
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}
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const T* force_get_host_pointer() const {
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return reinterpret_cast<const T*>(uintptr_t { data });
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}
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};
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template<typename T>
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@ -5,6 +5,7 @@ $end_info$
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*/
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#include <string_view>
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#include <unordered_map>
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#include <wayland-client.h>
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#include <stdio.h>
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@ -19,15 +20,219 @@ $end_info$
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#include <charconv>
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#include <cstring>
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#include <map>
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#include <span>
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#include <string>
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#include <ranges>
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template<>
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struct guest_layout<wl_argument> {
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#ifdef IS_32BIT_THUNK
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using type = uint32_t;
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#else
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using type = wl_argument;
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#endif
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type data;
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guest_layout& operator=(const wl_argument from) {
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#ifdef IS_32BIT_THUNK
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data = from.u;
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#else
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data = from;
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#endif
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return *this;
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}
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};
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#include "thunkgen_host_libwayland-client.inl"
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// Maps guest interface to host_interfaces
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static std::unordered_map<guest_layout<const wl_interface>*, wl_interface*> guest_to_host_interface;
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static wl_interface* get_proxy_interface(wl_proxy* proxy) {
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// wl_proxy is a private struct, but its first member is the wl_interface pointer
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return *reinterpret_cast<wl_interface**>(proxy);
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}
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static void assert_is_valid_host_interface(const wl_interface* interface) {
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// The 32-bit data layout of wl_interface differs from the 64-bit one due to
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// its pointer members. Our repacking code takes care of these differences.
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//
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// To ensure this indeed functions properly, a simple consistency check is
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// applied here: If any of the message counts are absurdly high, it means
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// data from pointer members leaked into other members.
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if ((uint32_t)interface->method_count >= 0x1000 || (uint32_t)interface->event_count >= 0x1000) {
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fprintf(stderr, "ERROR: Expected %p to be a host wl_interface, but it's not\n", interface);
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std::abort();
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}
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}
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#ifdef IS_32BIT_THUNK
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static void assert_is_valid_guest_interface(guest_layout<const wl_interface*> guest_interface) {
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// Consistency check for expected data layout.
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// See assert_is_valid_host_interface for details
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const wl_interface* as_host_interface = (const wl_interface*)guest_interface.force_get_host_pointer();
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if ((uint32_t)as_host_interface->method_count < 0x1000 && (uint32_t)as_host_interface->event_count < 0x1000) {
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fprintf(stderr, "ERROR: Expected %p to be a guest wl_interface, but it's not\n", guest_interface.force_get_host_pointer());
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std::abort();
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}
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}
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static void repack_guest_wl_interface_to_host(guest_layout<const wl_interface*> guest_interface_ptr, wl_interface* host_interface) {
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auto& guest_interface = *guest_interface_ptr.get_pointer();
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static_assert(sizeof(guest_interface) == 24);
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*host_interface = host_layout<wl_interface> { guest_interface }.data;
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fex_apply_custom_repacking_entry(reinterpret_cast<host_layout<wl_interface>&>(*host_interface), guest_interface);
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}
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// Maps guest interface pointers to host pointers
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static const wl_interface* lookup_wl_interface(guest_layout<const wl_interface*> interface) {
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// Used e.g. for wl_shm_pool_destroy
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if (interface.force_get_host_pointer() == nullptr) {
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return nullptr;
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}
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auto [host_interface_it, inserted] = guest_to_host_interface.emplace(interface.get_pointer(), nullptr);
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if (!inserted) {
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assert_is_valid_host_interface(host_interface_it->second);
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return host_interface_it->second;
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}
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assert_is_valid_guest_interface(interface);
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fprintf(stderr, "Unknown wayland interface %p, adding to registry\n", interface.get_pointer());
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host_interface_it->second = new wl_interface;
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wl_interface* host_interface = host_interface_it->second;
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repack_guest_wl_interface_to_host(interface, host_interface);
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return host_interface_it->second;
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}
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void fex_custom_repack_entry(host_layout<wl_interface>& into, guest_layout<wl_interface> const& from) {
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// NOTE: These arrays are complements to global symbols in the guest, so we
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// never explicitly free this memory
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auto& host_interface = into.data;
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into.data.methods = new wl_message[into.data.method_count];
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into.data.events = new wl_message[into.data.event_count];
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memset((void*)host_interface.methods, 0, sizeof(wl_message) * host_interface.method_count);
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for (int i = 0; i < host_interface.method_count; ++i) {
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const auto& guest_method { from.data.methods.get_pointer()[i] };
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host_layout<wl_message> host_method { guest_method };
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fex_apply_custom_repacking_entry(host_method, guest_method);
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memcpy((void*)&host_interface.methods[i], &host_method, sizeof(host_method));
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}
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memset((void*)host_interface.events, 0, sizeof(wl_message) * host_interface.event_count);
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for (int i = 0; i < host_interface.event_count; ++i) {
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const auto& guest_event { from.data.events.get_pointer()[i] };
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host_layout<wl_message> host_event { guest_event };
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fex_apply_custom_repacking_entry(host_event, guest_event);
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memcpy((void*)&host_interface.events[i], &host_event, sizeof(host_event));
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}
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}
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bool fex_custom_repack_exit(guest_layout<wl_interface>&, host_layout<wl_interface> const&) {
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fprintf(stderr, "Should not be called: %s\n", __PRETTY_FUNCTION__);
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std::abort();
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}
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void fex_custom_repack_entry(host_layout<wl_message>& into, guest_layout<wl_message> const& from) {
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auto& host_method = into.data;
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auto num_types = std::ranges::count_if(std::string_view { host_method.signature }, isalpha);
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if (num_types) {
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host_method.types = new const wl_interface*[num_types];
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for (int type = 0; type < num_types; ++type) {
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auto guest_interface_addr = from.data.types.get_pointer()[type];
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host_method.types[type] = guest_interface_addr.force_get_host_pointer() ? lookup_wl_interface(guest_interface_addr) : nullptr;
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}
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}
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}
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bool fex_custom_repack_exit(guest_layout<wl_message>&, host_layout<wl_message> const&) {
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fprintf(stderr, "Should not be called: %s\n", __PRETTY_FUNCTION__);
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std::abort();
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}
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#else
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const wl_interface* lookup_wl_interface(guest_layout<const wl_interface*> interface) {
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return interface.force_get_host_pointer();
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}
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#endif
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static wl_proxy* fexfn_impl_libwayland_client_wl_proxy_create(wl_proxy* proxy, guest_layout<const wl_interface*> guest_interface_raw) {
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auto host_interface = lookup_wl_interface(guest_interface_raw);
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return fexldr_ptr_libwayland_client_wl_proxy_create(proxy, host_interface);
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}
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#define WL_CLOSURE_MAX_ARGS 20
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static auto
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fex_wl_remap_argument_list(guest_layout<wl_argument*> args, const wl_message& message) {
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#ifndef IS_32BIT_THUNK
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// Cast to host layout and return as std::span
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wl_argument* host_args = host_layout<wl_argument*> { args }.data;
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return std::span<wl_argument, WL_CLOSURE_MAX_ARGS> { host_args, WL_CLOSURE_MAX_ARGS };
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#else
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// Return a new array of elements zero-extended to 64-bit
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std::array<wl_argument, WL_CLOSURE_MAX_ARGS> host_args;
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int arg_count = std::ranges::count_if(std::string_view { message.signature }, isalpha);
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for (int i = 0; i < arg_count; ++i) {
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// NOTE: wl_argument can store a pointer argument, so for 32-bit guests
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// we need to make sure the upper 32-bits are explicitly zeroed
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std::memset(&host_args[i], 0, sizeof(host_args[i]));
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std::memcpy(&host_args[i], &args.get_pointer()[i], sizeof(args.get_pointer()[i]));
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}
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return host_args;
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#endif
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}
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extern "C" void
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fexfn_impl_libwayland_client_wl_proxy_marshal_array(
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wl_proxy *proxy, uint32_t opcode,
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guest_layout<wl_argument*> args) {
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auto host_args = fex_wl_remap_argument_list(args, get_proxy_interface(proxy)->methods[opcode]);
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fexldr_ptr_libwayland_client_wl_proxy_marshal_array(proxy, opcode, host_args.data());
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}
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static wl_proxy*
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fex_wl_proxy_marshal_array(
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wl_proxy *proxy, uint32_t opcode,
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guest_layout<wl_argument*> args,
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guest_layout<const wl_interface*> guest_interface,
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std::optional<uint32_t> version,
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std::optional<uint32_t> flags) {
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auto interface = lookup_wl_interface(guest_interface);
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assert_is_valid_host_interface(get_proxy_interface(proxy));
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auto host_args = fex_wl_remap_argument_list(args, get_proxy_interface(proxy)->methods[opcode]);
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if (false) {
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} else if (!version && !flags) {
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return nullptr;
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} else if (version && flags) {
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// wl_proxy_marshal_array_flags is only available starting from Wayland 1.19.91
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#if WAYLAND_VERSION_MAJOR * 10000 + WAYLAND_VERSION_MINOR * 100 + WAYLAND_VERSION_MICRO >= 11991
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return fexldr_ptr_libwayland_client_wl_proxy_marshal_array_flags(proxy, opcode, interface, version.value(), flags.value(), host_args.data());
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#else
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fprintf(stderr, "Host Wayland version is too old to support FEX thunking\n");
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__builtin_trap();
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#endif
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} else {
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fprintf(stderr, "Invalid configuration\n");
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__builtin_trap();
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}
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}
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extern "C" wl_proxy*
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fexfn_impl_libwayland_client_wl_proxy_marshal_array_flags(
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wl_proxy *proxy, uint32_t opcode,
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guest_layout<const wl_interface*> interface,
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uint32_t version, uint32_t flags,
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guest_layout<wl_argument*> args) {
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return fex_wl_proxy_marshal_array(proxy, opcode, args, interface, version, flags);
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}
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// See wayland-util.h for documentation on protocol message signatures
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template<char> struct ArgType;
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template<> struct ArgType<'s'> { using type = const char*; };
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@ -46,21 +251,25 @@ static void WaylandFinalizeHostTrampolineForGuestListener(void (*callback)()) {
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}
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extern "C" int fexfn_impl_libwayland_client_wl_proxy_add_listener(struct wl_proxy *proxy,
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guest_layout<void (**)(void)> callback_raw, void* data) {
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guest_layout<void (**)(void)> callback_table_raw, void* data) {
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auto interface = get_proxy_interface(proxy);
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assert_is_valid_host_interface(interface);
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auto callback_table = callback_table_raw.force_get_host_pointer();
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for (int i = 0; i < interface->event_count; ++i) {
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auto signature_view = std::string_view { interface->events[i].signature };
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// A leading number indicates the minimum protocol version
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uint32_t since_version = 0;
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auto [ptr, res] = std::from_chars(signature_view.begin(), signature_view.end(), since_version, 10);
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std::string signature { ptr, &*signature_view.end() };
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auto signature = std::string { signature_view.substr(ptr - signature_view.begin()) };
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// ? just indicates that the argument may be null, so it doesn't change the signature
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signature.erase(std::remove(signature.begin(), signature.end(), '?'), signature.end());
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auto callback = reinterpret_cast<void(*)()>(uintptr_t { callback_raw.get_pointer()[i].data });
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auto callback = callback_table[i];
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if (signature == "") {
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// E.g. xdg_toplevel::close
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@ -162,15 +371,15 @@ extern "C" int fexfn_impl_libwayland_client_wl_proxy_add_listener(struct wl_prox
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}
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// Pass the original function pointer table to the host wayland library. This ensures the table is valid until the listener is unregistered.
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return fexldr_ptr_libwayland_client_wl_proxy_add_listener(proxy,
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reinterpret_cast<void(**)(void)>(callback_raw.get_pointer()),
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data);
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return fexldr_ptr_libwayland_client_wl_proxy_add_listener(proxy, callback_table, data);
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}
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wl_interface* fexfn_impl_libwayland_client_fex_wl_exchange_interface_pointer(wl_interface* guest_interface, char const* name) {
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auto host_interface = reinterpret_cast<wl_interface*>(dlsym(fexldr_ptr_libwayland_client_so, (std::string { name } + "_interface").c_str()));
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void fexfn_impl_libwayland_client_fex_wl_exchange_interface_pointer(guest_layout<wl_interface*> guest_interface_raw, const char* name) {
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auto& guest_interface = *guest_interface_raw.get_pointer();
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auto& host_interface = guest_to_host_interface[reinterpret_cast<guest_layout<const wl_interface>*>(&guest_interface)];
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host_interface = reinterpret_cast<wl_interface*>(dlsym(fexldr_ptr_libwayland_client_so, (std::string { name } + "_interface").c_str()));
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if (!host_interface) {
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fprintf(stderr, "Could not find host interface corresponding to %p (%s)\n", guest_interface, name);
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fprintf(stderr, "Could not find host interface corresponding to %p (%s)\n", &guest_interface, name);
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std::abort();
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}
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@ -178,23 +387,34 @@ wl_interface* fexfn_impl_libwayland_client_fex_wl_exchange_interface_pointer(wl_
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// them into the rodata section of the application itself instead of the
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// library. To copy the host information to them on startup, we must
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// temporarily disable write-protection on this data hence.
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auto page_begin = reinterpret_cast<uintptr_t>(guest_interface) & ~uintptr_t { 0xfff };
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auto page_begin = reinterpret_cast<uintptr_t>(guest_interface_raw.force_get_host_pointer()) & ~uintptr_t { 0xfff };
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if (0 != mprotect((void*)page_begin, 0x1000, PROT_READ | PROT_WRITE)) {
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fprintf(stderr, "ERROR: %s\n", strerror(errno));
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std::abort();
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}
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#ifdef IS_32BIT_THUNK
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// Requires struct repacking for wl_interface
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#error Not implemented
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#ifndef IS_32BIT_THUNK
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memcpy(&guest_interface, host_interface, sizeof(wl_interface));
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#else
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memcpy(guest_interface, host_interface, sizeof(wl_interface));
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guest_interface = to_guest(to_host_layout(*host_interface));
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// NOTE: These arrays are complements to global symbols in the guest, so we
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// never explicitly free this memory
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guest_interface.data.methods.data = (uintptr_t)new guest_layout<wl_message>[host_interface->method_count];
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for (int i = 0; i < host_interface->method_count; ++i) {
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guest_interface.data.methods.get_pointer()[i] = to_guest(to_host_layout(host_interface->methods[i]));
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guest_interface.data.methods.get_pointer()[i].data.types = to_guest(to_host_layout(host_interface->methods[i].types));
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}
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guest_interface.data.events.data = (uintptr_t)new guest_layout<wl_message>[host_interface->event_count];
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for (int i = 0; i < host_interface->event_count; ++i) {
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guest_interface.data.events.get_pointer()[i] = to_guest(to_host_layout(host_interface->events[i]));
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guest_interface.data.events.get_pointer()[i].data.types = to_guest(to_host_layout(host_interface->events[i].types));
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}
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#endif
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// TODO: Disabled until we ensure the interface data is indeed stored in rodata
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// mprotect((void*)page_begin, 0x1000, PROT_READ);
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return host_interface;
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}
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void fexfn_impl_libwayland_client_fex_wl_get_method_signature(wl_proxy* proxy, uint32_t opcode, char* out) {
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@ -16,25 +16,34 @@ struct fex_gen_param {};
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template<> struct fex_gen_type<wl_display> : fexgen::opaque_type {};
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template<> struct fex_gen_type<wl_proxy> : fexgen::opaque_type {};
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template<> struct fex_gen_type<wl_interface> : fexgen::opaque_type {};
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template<> struct fex_gen_type<wl_event_queue> : fexgen::opaque_type {};
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// Passed over Wayland's wire protocol for some functions
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template<> struct fex_gen_type<wl_array> {};
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template<> struct fex_gen_type<wl_array> : fexgen::emit_layout_wrappers {};
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#ifdef IS_32BIT_THUNK
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// wl_interface and wl_message reference each other through pointers
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template<> struct fex_gen_type<wl_interface> : fexgen::emit_layout_wrappers {};
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template<> struct fex_gen_config<&wl_interface::methods> : fexgen::custom_repack {};
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template<> struct fex_gen_config<&wl_interface::events> : fexgen::custom_repack {};
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template<> struct fex_gen_type<wl_message> : fexgen::emit_layout_wrappers {};
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template<> struct fex_gen_config<&wl_message::types> : fexgen::custom_repack {};
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#else
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template<> struct fex_gen_type<wl_interface> : fexgen::assume_compatible_data_layout {};
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#endif
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template<> struct fex_gen_config<wl_proxy_destroy> : fexgen::custom_guest_entrypoint {};
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template<> struct fex_gen_config<wl_display_cancel_read> {};
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template<> struct fex_gen_config<wl_display_connect> {};
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template<> struct fex_gen_config<wl_display_flush> {};
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template<> struct fex_gen_config<wl_display_cancel_read> {};
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template<> struct fex_gen_config<wl_display_create_queue> {};
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template<> struct fex_gen_config<wl_display_disconnect> {};
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template<> struct fex_gen_config<wl_display_dispatch> {};
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template<> struct fex_gen_config<wl_display_dispatch_pending> {};
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template<> struct fex_gen_config<wl_display_dispatch_queue> {};
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||||
template<> struct fex_gen_config<wl_display_dispatch_queue_pending> {};
|
||||
template<> struct fex_gen_config<wl_display_flush> {};
|
||||
template<> struct fex_gen_config<wl_display_prepare_read> {};
|
||||
template<> struct fex_gen_config<wl_display_prepare_read_queue> {};
|
||||
template<> struct fex_gen_config<wl_display_read_events> {};
|
||||
@ -49,7 +58,8 @@ template<> struct fex_gen_config<wl_proxy_add_listener> : fexgen::custom_host_im
|
||||
template<> struct fex_gen_param<wl_proxy_add_listener, 1, void(**)()> : fexgen::ptr_passthrough {};
|
||||
// User-provided data pointer (not used in caller-provided callback)
|
||||
template<> struct fex_gen_param<wl_proxy_add_listener, 2, void*> : fexgen::assume_compatible_data_layout {};
|
||||
template<> struct fex_gen_config<wl_proxy_create> {};
|
||||
template<> struct fex_gen_config<wl_proxy_create> : fexgen::custom_host_impl {};
|
||||
template<> struct fex_gen_param<wl_proxy_create, 1, const wl_interface*> : fexgen::ptr_passthrough {};
|
||||
template<> struct fex_gen_config<wl_proxy_create_wrapper> {};
|
||||
template<> struct fex_gen_config<wl_proxy_get_listener> {};
|
||||
template<> struct fex_gen_config<wl_proxy_get_tag> {};
|
||||
@ -61,15 +71,19 @@ template<> struct fex_gen_config<wl_proxy_set_tag> {};
|
||||
template<> struct fex_gen_config<wl_proxy_set_user_data> {};
|
||||
template<> struct fex_gen_config<wl_proxy_wrapper_destroy> {};
|
||||
|
||||
template<> struct fex_gen_config<wl_proxy_marshal_array> {};
|
||||
template<> struct fex_gen_config<wl_proxy_marshal_array> : fexgen::custom_host_impl {};
|
||||
template<> struct fex_gen_param<wl_proxy_marshal_array, 2, wl_argument*> : fexgen::ptr_passthrough {};
|
||||
// wl_proxy_marshal_array_flags is only available starting from Wayland 1.19.91
|
||||
#if WAYLAND_VERSION_MAJOR * 10000 + WAYLAND_VERSION_MINOR * 100 + WAYLAND_VERSION_MICRO >= 11991
|
||||
template<> struct fex_gen_config<wl_proxy_marshal_array_flags> {};
|
||||
template<> struct fex_gen_config<wl_proxy_marshal_array_flags> : fexgen::custom_host_impl {};
|
||||
template<> struct fex_gen_param<wl_proxy_marshal_array_flags, 2, const wl_interface*> : fexgen::ptr_passthrough {};
|
||||
template<> struct fex_gen_param<wl_proxy_marshal_array_flags, 5, wl_argument*> : fexgen::ptr_passthrough {};
|
||||
#endif
|
||||
|
||||
// Guest notifies host about its interface. Host returns its corresponding interface pointer
|
||||
wl_interface* fex_wl_exchange_interface_pointer(wl_interface*, const char* name);
|
||||
void fex_wl_exchange_interface_pointer(wl_interface*, const char* name);
|
||||
template<> struct fex_gen_config<fex_wl_exchange_interface_pointer> : fexgen::custom_host_impl {};
|
||||
template<> struct fex_gen_param<fex_wl_exchange_interface_pointer, 0, wl_interface*> : fexgen::ptr_passthrough {};
|
||||
|
||||
// This is equivalent to reading proxy->interface->methods[opcode].signature on 64-bit.
|
||||
// On 32-bit, the data layout differs between host and guest however, so we let the host extract the data.
|
||||
|
Loading…
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Reference in New Issue
Block a user