From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 js/src/wasm/WasmRealm.cpp | 152 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 js/src/wasm/WasmRealm.cpp

(limited to 'js/src/wasm/WasmRealm.cpp')

diff --git a/js/src/wasm/WasmRealm.cpp b/js/src/wasm/WasmRealm.cpp
new file mode 100644
index 0000000000..8907715c8f
--- /dev/null
+++ b/js/src/wasm/WasmRealm.cpp
@@ -0,0 +1,152 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ *
+ * Copyright 2016 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "wasm/WasmRealm.h"
+
+#include "vm/GlobalObject.h"
+#include "vm/Realm.h"
+#include "wasm/WasmDebug.h"
+#include "wasm/WasmInstance.h"
+#include "wasm/WasmProcess.h"
+
+#include "debugger/DebugAPI-inl.h"
+#include "wasm/WasmInstance-inl.h"
+
+using namespace js;
+using namespace wasm;
+
+wasm::Realm::Realm(JSRuntime* rt) : runtime_(rt) {}
+
+wasm::Realm::~Realm() { MOZ_ASSERT(instances_.empty()); }
+
+struct InstanceComparator {
+  const Instance& target;
+  explicit InstanceComparator(const Instance& target) : target(target) {}
+
+  int operator()(const Instance* instance) const {
+    if (instance == &target) {
+      return 0;
+    }
+
+    // Instances can share code, so the segments can be equal (though they
+    // can't partially overlap).  If the codeBases are equal, we sort by
+    // Instance address.  Thus a Code may map to many instances.
+
+    // Compare by the first tier, always.
+
+    Tier instanceTier = instance->code().stableTier();
+    Tier targetTier = target.code().stableTier();
+
+    if (instance->codeBase(instanceTier) == target.codeBase(targetTier)) {
+      return instance < &target ? -1 : 1;
+    }
+
+    return target.codeBase(targetTier) < instance->codeBase(instanceTier) ? -1
+                                                                          : 1;
+  }
+};
+
+bool wasm::Realm::registerInstance(JSContext* cx,
+                                   Handle<WasmInstanceObject*> instanceObj) {
+  MOZ_ASSERT(runtime_ == cx->runtime());
+
+  Instance& instance = instanceObj->instance();
+  MOZ_ASSERT(this == &instance.realm()->wasm);
+
+  instance.ensureProfilingLabels(cx->runtime()->geckoProfiler().enabled());
+
+  if (instance.debugEnabled() &&
+      instance.realm()->debuggerObservesAllExecution()) {
+    instance.debug().ensureEnterFrameTrapsState(cx, &instance, true);
+  }
+
+  {
+    if (!instances_.reserve(instances_.length() + 1)) {
+      return false;
+    }
+
+    auto runtimeInstances = cx->runtime()->wasmInstances.lock();
+    if (!runtimeInstances->reserve(runtimeInstances->length() + 1)) {
+      return false;
+    }
+
+    // To avoid implementing rollback, do not fail after mutations start.
+
+    InstanceComparator cmp(instance);
+    size_t index;
+
+    // The following section is not unsafe, but simulated OOM do not consider
+    // the fact that these insert calls are guarded by the previous reserve
+    // calls.
+    AutoEnterOOMUnsafeRegion oomUnsafe;
+    (void)oomUnsafe;
+
+    MOZ_ALWAYS_FALSE(
+        BinarySearchIf(instances_, 0, instances_.length(), cmp, &index));
+    MOZ_ALWAYS_TRUE(instances_.insert(instances_.begin() + index, &instance));
+
+    MOZ_ALWAYS_FALSE(BinarySearchIf(runtimeInstances.get(), 0,
+                                    runtimeInstances->length(), cmp, &index));
+    MOZ_ALWAYS_TRUE(
+        runtimeInstances->insert(runtimeInstances->begin() + index, &instance));
+  }
+
+  // Notify the debugger after wasmInstances is unlocked.
+  DebugAPI::onNewWasmInstance(cx, instanceObj);
+  return true;
+}
+
+void wasm::Realm::unregisterInstance(Instance& instance) {
+  InstanceComparator cmp(instance);
+  size_t index;
+
+  if (BinarySearchIf(instances_, 0, instances_.length(), cmp, &index)) {
+    instances_.erase(instances_.begin() + index);
+  }
+
+  auto runtimeInstances = runtime_->wasmInstances.lock();
+  if (BinarySearchIf(runtimeInstances.get(), 0, runtimeInstances->length(), cmp,
+                     &index)) {
+    runtimeInstances->erase(runtimeInstances->begin() + index);
+  }
+}
+
+void wasm::Realm::ensureProfilingLabels(bool profilingEnabled) {
+  for (Instance* instance : instances_) {
+    instance->ensureProfilingLabels(profilingEnabled);
+  }
+}
+
+void wasm::Realm::addSizeOfExcludingThis(MallocSizeOf mallocSizeOf,
+                                         size_t* realmTables) {
+  *realmTables += instances_.sizeOfExcludingThis(mallocSizeOf);
+}
+
+void wasm::InterruptRunningCode(JSContext* cx) {
+  auto runtimeInstances = cx->runtime()->wasmInstances.lock();
+  for (Instance* instance : runtimeInstances.get()) {
+    instance->setInterrupt();
+  }
+}
+
+void wasm::ResetInterruptState(JSContext* cx) {
+  auto runtimeInstances = cx->runtime()->wasmInstances.lock();
+  for (Instance* instance : runtimeInstances.get()) {
+    instance->resetInterrupt(cx);
+  }
+}
-- 
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