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initial wasm support

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This commit is contained in:
lizzie
2026-06-08 23:30:08 +00:00
parent fbb05fc5d5
commit 9e651d9460
25 changed files with 522 additions and 80 deletions
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src/common/CMakeLists.txt
+5 -1
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@@ -236,7 +236,11 @@ else()
target_link_libraries(common PUBLIC Boost::headers)
endif()
target_link_libraries(common PRIVATE OpenSSL::SSL)
target_link_libraries(common PUBLIC Boost::filesystem Boost::context httplib::httplib nlohmann_json::nlohmann_json)
target_link_libraries(common PUBLIC Boost::filesystem httplib::httplib nlohmann_json::nlohmann_json)
if (NOT PLATFORM_EMSCRIPTEN)
# Emscripten is: "bring your own implementation", boost doesn't add upstream support sadly
target_link_libraries(common PRIVATE Boost::context)
endif()
if (lz4_ADDED)
target_include_directories(common PRIVATE ${lz4_SOURCE_DIR}/lib)
src/common/fiber.cpp
+85 -12
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@@ -11,7 +11,12 @@
#include "common/fiber.h"
#include "common/virtual_buffer.h"
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#include <emscripten/fiber.h>
#else
#include <boost/context/detail/fcontext.hpp>
#endif
namespace Common {
@@ -22,36 +27,103 @@ constexpr size_t DEFAULT_STACK_SIZE = 512 * 4096;
#endif
constexpr u32 CANARY_VALUE = 0xDEADBEEF;
#ifdef __EMSCRIPTEN__
struct Fiber::FiberImpl {
FiberImpl() {}
u32 canary_1 = CANARY_VALUE;
std::array<u8, DEFAULT_STACK_SIZE> stack{};
std::array<u8, DEFAULT_STACK_SIZE> rewind_stack{};
std::array<u8, DEFAULT_STACK_SIZE> astack{};
u32 canary_2 = CANARY_VALUE;
boost::context::detail::fcontext_t context{};
boost::context::detail::fcontext_t rewind_context{};
emscripten_fiber_t* context{nullptr};
std::mutex guard;
std::function<void()> entry_point;
std::function<void()> rewind_point;
std::shared_ptr<Fiber> previous_fiber;
u8* stack_limit = nullptr;
u8* rewind_stack_limit = nullptr;
bool is_thread_fiber = false;
bool released = false;
};
void Fiber::SetRewindPoint(std::function<void()>&& rewind_func) {
impl->rewind_point = std::move(rewind_func);
Fiber::Fiber(std::function<void()>&& entry_point_func) : impl{std::make_unique<FiberImpl>()} {
impl->entry_point = std::move(entry_point_func);
emscripten_fiber_init(impl->context, [](void *user_data) -> void {
auto* fiber = static_cast<Fiber*>(user_data);
ASSERT(fiber && fiber->impl && fiber->impl->previous_fiber && fiber->impl->previous_fiber->impl);
ASSERT(fiber->impl->canary_1 == CANARY_VALUE);
ASSERT(fiber->impl->canary_2 == CANARY_VALUE);
fiber->impl->previous_fiber->impl->context = fiber->impl->context;
fiber->impl->previous_fiber->impl->guard.unlock();
fiber->impl->previous_fiber.reset();
fiber->impl->entry_point();
UNREACHABLE();
}, impl.get(), impl->stack.data(), impl->stack.size(), impl->astack.data(), impl->astack.size());
}
Fiber::Fiber() : impl{std::make_unique<FiberImpl>()} {}
Fiber::~Fiber() {
if (!impl->released) {
// Make sure the Fiber is not being used
const bool locked = impl->guard.try_lock();
ASSERT(locked && "Destroying a fiber that's still running");
if (locked) {
impl->guard.unlock();
}
}
}
void Fiber::Exit() {
ASSERT(impl->is_thread_fiber && "Exiting non main thread fiber");
if (impl->is_thread_fiber) {
impl->guard.unlock();
impl->released = true;
}
}
void Fiber::YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to) {
to.impl->guard.lock();
to.impl->previous_fiber = weak_from.lock();
emscripten_fiber_swap(to.impl->context, to.impl->previous_fiber->impl->context);
// "from" might no longer be valid if the thread was killed
if (auto from = weak_from.lock()) {
if (from->impl->previous_fiber == nullptr) {
ASSERT(false && "previous_fiber is nullptr!");
} else {
from->impl->previous_fiber->impl->guard.unlock();
from->impl->previous_fiber.reset();
}
}
}
std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
std::shared_ptr<Fiber> fiber = std::shared_ptr<Fiber>{new Fiber()};
fiber->impl->guard.lock();
fiber->impl->is_thread_fiber = true;
return fiber;
}
#else
struct Fiber::FiberImpl {
FiberImpl() {}
u32 canary_1 = CANARY_VALUE;
std::array<u8, DEFAULT_STACK_SIZE> stack{};
u32 canary_2 = CANARY_VALUE;
boost::context::detail::fcontext_t context{};
std::mutex guard;
std::function<void()> entry_point;
std::shared_ptr<Fiber> previous_fiber;
u8* stack_limit = nullptr;
bool is_thread_fiber = false;
bool released = false;
};
Fiber::Fiber(std::function<void()>&& entry_point_func) : impl{std::make_unique<FiberImpl>()} {
impl->entry_point = std::move(entry_point_func);
impl->stack_limit = impl->stack.data();
impl->rewind_stack_limit = impl->rewind_stack.data();
u8* stack_base = impl->stack_limit + DEFAULT_STACK_SIZE;
impl->context = boost::context::detail::make_fcontext(stack_base, impl->stack.size(), [](boost::context::detail::transfer_t transfer) -> void {
auto* fiber = static_cast<Fiber*>(transfer.data);
@@ -72,7 +144,7 @@ Fiber::~Fiber() {
if (!impl->released) {
// Make sure the Fiber is not being used
const bool locked = impl->guard.try_lock();
ASSERT_MSG(locked, "Destroying a fiber that's still running");
ASSERT(locked && "Destroying a fiber that's still running");
if (locked) {
impl->guard.unlock();
}
@@ -80,7 +152,7 @@ Fiber::~Fiber() {
}
void Fiber::Exit() {
ASSERT_MSG(impl->is_thread_fiber, "Exiting non main thread fiber");
ASSERT(impl->is_thread_fiber && "Exiting non main thread fiber");
if (impl->is_thread_fiber) {
impl->guard.unlock();
impl->released = true;
@@ -110,5 +182,6 @@ std::shared_ptr<Fiber> Fiber::ThreadToFiber() {
fiber->impl->is_thread_fiber = true;
return fiber;
}
#endif
} // namespace Common
src/common/fiber.h
+1 -2
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@@ -1,4 +1,4 @@
// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
@@ -45,7 +45,6 @@ public:
/// Fiber 'from' must be the currently running fiber.
static void YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to);
[[nodiscard]] static std::shared_ptr<Fiber> ThreadToFiber();
void SetRewindPoint(std::function<void()>&& rewind_func);
/// Only call from main thread's fiber
void Exit();
private: