Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 239 insertions, 0 deletions

diff --git a/js/src/wasm/WasmIntrinsic.cpp b/js/src/wasm/WasmIntrinsic.cpp
new file mode 100644
index 0000000000..cc43ed887c
--- /dev/null
+++ b/js/src/wasm/WasmIntrinsic.cpp
@@ -0,0 +1,239 @@
+/* -*- 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 2021 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/WasmIntrinsic.h"
+
+#include "util/Text.h"
+#include "vm/GlobalObject.h"
+
+#include "wasm/WasmGenerator.h"
+#include "wasm/WasmIntrinsicGenerated.h"
+#include "wasm/WasmJS.h"
+#include "wasm/WasmModule.h"
+#include "wasm/WasmOpIter.h"
+#include "wasm/WasmValidate.h"
+
+using namespace js;
+using namespace js::wasm;
+
+#define INTR_DECL(op, export, sa_name, abitype, entry, idx) \
+  static const ValType Intrinsic##op##_Params[] =           \
+      DECLARE_INTRINSIC_SAS_PARAM_VALTYPES_##op;            \
+                                                            \
+  const Intrinsic Intrinsic##op = {                         \
+      export,                                               \
+      mozilla::Span<const ValType>(Intrinsic##op##_Params), \
+      SASig##sa_name,                                       \
+  };
+
+FOR_EACH_INTRINSIC(INTR_DECL)
+#undef INTR_DECL
+
+bool Intrinsic::funcType(FuncType* type) const {
+  ValTypeVector paramVec;
+  if (!paramVec.append(params.data(), params.data() + params.size())) {
+    return false;
+  }
+  *type = FuncType(std::move(paramVec), ValTypeVector());
+  return true;
+}
+
+/* static */
+const Intrinsic& Intrinsic::getFromId(IntrinsicId id) {
+  switch (id) {
+#define OP(op, export, sa_name, abitype, entry, idx) \
+  case IntrinsicId::op:                              \
+    return Intrinsic##op;
+    FOR_EACH_INTRINSIC(OP)
+#undef OP
+    default:
+      MOZ_CRASH("unexpected intrinsic");
+  }
+}
+
+bool EncodeIntrinsicBody(const Intrinsic& intrinsic, IntrinsicId id,
+                         Bytes* body) {
+  Encoder encoder(*body);
+  if (!EncodeLocalEntries(encoder, ValTypeVector())) {
+    return false;
+  }
+  for (uint32_t i = 0; i < intrinsic.params.size(); i++) {
+    if (!encoder.writeOp(Op::LocalGet) || !encoder.writeVarU32(i)) {
+      return false;
+    }
+  }
+  if (!encoder.writeOp(MozOp::Intrinsic)) {
+    return false;
+  }
+  if (!encoder.writeVarU32(uint32_t(id))) {
+    return false;
+  }
+  if (!encoder.writeOp(Op::End)) {
+    return false;
+  }
+  return true;
+}
+
+bool wasm::CompileIntrinsicModule(JSContext* cx,
+                                  const mozilla::Span<IntrinsicId> ids,
+                                  Shareable sharedMemory,
+                                  MutableHandle<WasmModuleObject*> result) {
+  // Create the options manually, enabling intrinsics
+  FeatureOptions featureOptions;
+  featureOptions.intrinsics = true;
+
+  // Initialize the compiler environment, choosing the best tier possible
+  SharedCompileArgs compileArgs = CompileArgs::buildAndReport(
+      cx, ScriptedCaller(), featureOptions, /* reportOOM */ true);
+  if (!compileArgs) {
+    return false;
+  }
+  CompilerEnvironment compilerEnv(
+      CompileMode::Once, IonAvailable(cx) ? Tier::Optimized : Tier::Baseline,
+      DebugEnabled::False);
+  compilerEnv.computeParameters();
+
+  // Build a module environment
+  ModuleEnvironment moduleEnv(compileArgs->features);
+  if (!moduleEnv.init()) {
+    ReportOutOfMemory(cx);
+    return false;
+  }
+
+  // Add (import (memory 0))
+  CacheableName emptyString;
+  CacheableName memoryString;
+  if (!CacheableName::fromUTF8Chars("memory", &memoryString)) {
+    ReportOutOfMemory(cx);
+    return false;
+  }
+  if (!moduleEnv.imports.append(Import(std::move(emptyString),
+                                       std::move(memoryString),
+                                       DefinitionKind::Memory))) {
+    ReportOutOfMemory(cx);
+    return false;
+  }
+  moduleEnv.memory = Some(MemoryDesc(Limits(0, Nothing(), sharedMemory)));
+
+  // Add (type (func (params ...))) for each intrinsic. The function types will
+  // be deduplicated by the runtime
+  for (uint32_t funcIndex = 0; funcIndex < ids.size(); funcIndex++) {
+    const IntrinsicId& id = ids[funcIndex];
+    const Intrinsic& intrinsic = Intrinsic::getFromId(id);
+
+    FuncType type;
+    if (!intrinsic.funcType(&type) ||
+        !moduleEnv.types->addType(std::move(type))) {
+      ReportOutOfMemory(cx);
+      return false;
+    }
+  }
+
+  // Add (func (type $i)) declarations. Do this after all types have been added
+  // as the function declaration metadata uses pointers into the type vectors
+  // that must be stable.
+  for (uint32_t funcIndex = 0; funcIndex < ids.size(); funcIndex++) {
+    FuncDesc decl(&(*moduleEnv.types)[funcIndex].funcType(), funcIndex);
+    if (!moduleEnv.funcs.append(decl)) {
+      ReportOutOfMemory(cx);
+      return false;
+    }
+    moduleEnv.declareFuncExported(funcIndex, true, false);
+  }
+
+  // Add (export "$name" (func $i)) declarations.
+  for (uint32_t funcIndex = 0; funcIndex < ids.size(); funcIndex++) {
+    const Intrinsic& intrinsic = Intrinsic::getFromId(ids[funcIndex]);
+
+    CacheableName exportName;
+    if (!CacheableName::fromUTF8Chars(intrinsic.exportName, &exportName) ||
+        !moduleEnv.exports.append(Export(std::move(exportName), funcIndex,
+                                         DefinitionKind::Function))) {
+      ReportOutOfMemory(cx);
+      return false;
+    }
+  }
+
+  // Compile the module functions
+  UniqueChars error;
+  ModuleGenerator mg(*compileArgs, &moduleEnv, &compilerEnv, nullptr, &error,
+                     nullptr);
+  if (!mg.init(nullptr)) {
+    ReportOutOfMemory(cx);
+    return false;
+  }
+
+  // Prepare and compile function bodies
+  Vector<Bytes, 1, SystemAllocPolicy> bodies;
+  if (!bodies.reserve(ids.size())) {
+    ReportOutOfMemory(cx);
+    return false;
+  }
+  for (uint32_t funcIndex = 0; funcIndex < ids.size(); funcIndex++) {
+    IntrinsicId id = ids[funcIndex];
+    const Intrinsic& intrinsic = Intrinsic::getFromId(ids[funcIndex]);
+
+    // Compilation may be done using other threads, ModuleGenerator requires
+    // that function bodies live until after finishFuncDefs().
+    bodies.infallibleAppend(Bytes());
+    Bytes& bytecode = bodies.back();
+
+    // Encode function body that will call the intrinsic using our builtin
+    // opcode, and launch a compile task
+    if (!EncodeIntrinsicBody(intrinsic, id, &bytecode) ||
+        !mg.compileFuncDef(funcIndex, 0, bytecode.begin(),
+                           bytecode.begin() + bytecode.length())) {
+      // This must be an OOM and will be reported by the caller
+      MOZ_ASSERT(!error);
+      ReportOutOfMemory(cx);
+      return false;
+    }
+  }
+
+  // Finish and block on function compilation
+  if (!mg.finishFuncDefs()) {
+    // This must be an OOM and will be reported by the caller
+    MOZ_ASSERT(!error);
+    ReportOutOfMemory(cx);
+    return false;
+  }
+
+  // Create a dummy bytecode vector, that will not be used
+  SharedBytes bytecode = js_new<ShareableBytes>();
+  if (!bytecode) {
+    ReportOutOfMemory(cx);
+    return false;
+  }
+
+  // Finish the module
+  SharedModule module = mg.finishModule(*bytecode, nullptr);
+  if (!module) {
+    ReportOutOfMemory(cx);
+    return false;
+  }
+
+  // Create a WasmModuleObject for the module, and return it
+  RootedObject proto(
+      cx, GlobalObject::getOrCreatePrototype(cx, JSProto_WasmModule));
+  if (!proto) {
+    ReportOutOfMemory(cx);
+    return false;
+  }
+  result.set(WasmModuleObject::create(cx, *module, proto));
+  return !!result;
+}