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// Copyright 2023 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/wasm/well-known-imports.h"
#include "src/wasm/wasm-code-manager.h"
namespace v8::internal::wasm {
const char* WellKnownImportName(WellKnownImport wki) {
switch (wki) {
// Generic:
case WellKnownImport::kUninstantiated:
return "uninstantiated";
case WellKnownImport::kGeneric:
return "generic";
// Functions:
case WellKnownImport::kDataViewGetInt32:
return "DataView.getInt32";
case WellKnownImport::kDataViewSetInt32:
return "DataView.setInt32";
case WellKnownImport::kDoubleToString:
return "DoubleToString";
case WellKnownImport::kIntToString:
return "IntToString";
case WellKnownImport::kParseFloat:
return "ParseFloat";
case WellKnownImport::kStringCharCodeAt:
return "String.charCodeAt";
case WellKnownImport::kStringCodePointAt:
return "String.codePointAt";
case WellKnownImport::kStringCompare:
return "String.compare";
case WellKnownImport::kStringConcat:
return "String.concat";
case WellKnownImport::kStringEquals:
return "String.equals";
case WellKnownImport::kStringFromCharCode:
return "String.fromCharCode";
case WellKnownImport::kStringFromCodePoint:
return "String.fromCodePoint";
case WellKnownImport::kStringFromWtf16Array:
return "String.fromWtf16Array";
case WellKnownImport::kStringFromWtf8Array:
return "String.fromWtf8Array";
case WellKnownImport::kStringIndexOf:
return "String.indexOf";
case WellKnownImport::kStringLength:
return "String.length";
case WellKnownImport::kStringSubstring:
return "String.substring";
case WellKnownImport::kStringToLocaleLowerCaseStringref:
return "String.toLocaleLowerCase";
case WellKnownImport::kStringToLowerCaseStringref:
return "String.toLowerCase";
case WellKnownImport::kStringToWtf16Array:
return "String.toWtf16Array";
}
}
WellKnownImportsList::UpdateResult WellKnownImportsList::Update(
base::Vector<WellKnownImport> entries) {
DCHECK_EQ(entries.size(), static_cast<size_t>(size_));
{
base::MutexGuard lock(&mutex_);
for (size_t i = 0; i < entries.size(); i++) {
WellKnownImport entry = entries[i];
DCHECK(entry != WellKnownImport::kUninstantiated);
WellKnownImport old = statuses_[i].load(std::memory_order_relaxed);
if (old == WellKnownImport::kGeneric) continue;
if (old == entry) continue;
if (old == WellKnownImport::kUninstantiated) {
statuses_[i].store(entry, std::memory_order_relaxed);
} else {
// To avoid having to clear Turbofan code multiple times, we give up
// entirely once the first problem occurs.
// This is a heuristic; we could also choose to make finer-grained
// decisions and only set {statuses_[i] = kGeneric}. We expect that
// this case won't ever happen for production modules, so guarding
// against pathological cases seems more important than being lenient
// towards almost-well-behaved modules.
for (size_t j = 0; j < entries.size(); j++) {
statuses_[j].store(WellKnownImport::kGeneric,
std::memory_order_relaxed);
}
return UpdateResult::kFoundIncompatibility;
}
}
}
return UpdateResult::kOK;
}
void WellKnownImportsList::Initialize(
base::Vector<const WellKnownImport> entries) {
DCHECK_EQ(entries.size(), static_cast<size_t>(size_));
for (size_t i = 0; i < entries.size(); i++) {
DCHECK_EQ(WellKnownImport::kUninstantiated,
statuses_[i].load(std::memory_order_relaxed));
statuses_[i].store(entries[i], std::memory_order_relaxed);
}
}
} // namespace v8::internal::wasm
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