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Mypal/js/src/wasm/WasmInstance.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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/WasmInstance.h"
#include "jit/BaselineJIT.h"
#include "jit/JitCommon.h"
#include "wasm/WasmModule.h"
#include "jsobjinlines.h"
#include "vm/ArrayBufferObject-inl.h"
using namespace js;
using namespace js::jit;
using namespace js::wasm;
using mozilla::BinarySearch;
using mozilla::BitwiseCast;
using mozilla::IsNaN;
using mozilla::Swap;
class SigIdSet
{
typedef HashMap<const Sig*, uint32_t, SigHashPolicy, SystemAllocPolicy> Map;
Map map_;
public:
~SigIdSet() {
MOZ_ASSERT_IF(!JSRuntime::hasLiveRuntimes(), !map_.initialized() || map_.empty());
}
bool ensureInitialized(JSContext* cx) {
if (!map_.initialized() && !map_.init()) {
ReportOutOfMemory(cx);
return false;
}
return true;
}
bool allocateSigId(JSContext* cx, const Sig& sig, const void** sigId) {
Map::AddPtr p = map_.lookupForAdd(sig);
if (p) {
MOZ_ASSERT(p->value() > 0);
p->value()++;
*sigId = p->key();
return true;
}
UniquePtr<Sig> clone = MakeUnique<Sig>();
if (!clone || !clone->clone(sig) || !map_.add(p, clone.get(), 1)) {
ReportOutOfMemory(cx);
return false;
}
*sigId = clone.release();
MOZ_ASSERT(!(uintptr_t(*sigId) & SigIdDesc::ImmediateBit));
return true;
}
void deallocateSigId(const Sig& sig, const void* sigId) {
Map::Ptr p = map_.lookup(sig);
MOZ_RELEASE_ASSERT(p && p->key() == sigId && p->value() > 0);
p->value()--;
if (!p->value()) {
js_delete(p->key());
map_.remove(p);
}
}
};
ExclusiveData<SigIdSet>* sigIdSet = nullptr;
bool
js::wasm::InitInstanceStaticData()
{
MOZ_ASSERT(!sigIdSet);
sigIdSet = js_new<ExclusiveData<SigIdSet>>(mutexid::WasmSigIdSet);
return sigIdSet != nullptr;
}
void
js::wasm::ShutDownInstanceStaticData()
{
MOZ_ASSERT(sigIdSet);
js_delete(sigIdSet);
sigIdSet = nullptr;
}
const void**
Instance::addressOfSigId(const SigIdDesc& sigId) const
{
MOZ_ASSERT(sigId.globalDataOffset() >= InitialGlobalDataBytes);
return (const void**)(codeSegment().globalData() + sigId.globalDataOffset());
}
FuncImportTls&
Instance::funcImportTls(const FuncImport& fi)
{
MOZ_ASSERT(fi.tlsDataOffset() >= InitialGlobalDataBytes);
return *(FuncImportTls*)(codeSegment().globalData() + fi.tlsDataOffset());
}
TableTls&
Instance::tableTls(const TableDesc& td) const
{
MOZ_ASSERT(td.globalDataOffset >= InitialGlobalDataBytes);
return *(TableTls*)(codeSegment().globalData() + td.globalDataOffset);
}
bool
Instance::callImport(JSContext* cx, uint32_t funcImportIndex, unsigned argc, const uint64_t* argv,
MutableHandleValue rval)
{
const FuncImport& fi = metadata().funcImports[funcImportIndex];
InvokeArgs args(cx);
if (!args.init(cx, argc))
return false;
bool hasI64Arg = false;
MOZ_ASSERT(fi.sig().args().length() == argc);
for (size_t i = 0; i < argc; i++) {
switch (fi.sig().args()[i]) {
case ValType::I32:
args[i].set(Int32Value(*(int32_t*)&argv[i]));
break;
case ValType::F32:
args[i].set(JS::CanonicalizedDoubleValue(*(float*)&argv[i]));
break;
case ValType::F64:
args[i].set(JS::CanonicalizedDoubleValue(*(double*)&argv[i]));
break;
case ValType::I64: {
if (!JitOptions.wasmTestMode) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_WASM_BAD_I64);
return false;
}
RootedObject obj(cx, CreateI64Object(cx, *(int64_t*)&argv[i]));
if (!obj)
return false;
args[i].set(ObjectValue(*obj));
hasI64Arg = true;
break;
}
case ValType::I8x16:
case ValType::I16x8:
case ValType::I32x4:
case ValType::F32x4:
case ValType::B8x16:
case ValType::B16x8:
case ValType::B32x4:
MOZ_CRASH("unhandled type in callImport");
}
}
FuncImportTls& import = funcImportTls(fi);
RootedFunction importFun(cx, &import.obj->as<JSFunction>());
RootedValue fval(cx, ObjectValue(*import.obj));
RootedValue thisv(cx, UndefinedValue());
if (!Call(cx, fval, thisv, args, rval))
return false;
// Throw an error if returning i64 and not in test mode.
if (!JitOptions.wasmTestMode && fi.sig().ret() == ExprType::I64) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_WASM_BAD_I64);
return false;
}
// Don't try to optimize if the function has at least one i64 arg or if
// it returns an int64. GenerateJitExit relies on this, as does the
// type inference code below in this function.
if (hasI64Arg || fi.sig().ret() == ExprType::I64)
return true;
// The import may already have become optimized.
void* jitExitCode = codeBase() + fi.jitExitCodeOffset();
if (import.code == jitExitCode)
return true;
// Test if the function is JIT compiled.
if (!importFun->hasScript())
return true;
JSScript* script = importFun->nonLazyScript();
if (!script->hasBaselineScript()) {
MOZ_ASSERT(!script->hasIonScript());
return true;
}
// Don't enable jit entry when we have a pending ion builder.
// Take the interpreter path which will link it and enable
// the fast path on the next call.
if (script->baselineScript()->hasPendingIonBuilder())
return true;
// Currently we can't rectify arguments. Therefore disable if argc is too low.
if (importFun->nargs() > fi.sig().args().length())
return true;
// Ensure the argument types are included in the argument TypeSets stored in
// the TypeScript. This is necessary for Ion, because the import will use
// the skip-arg-checks entry point.
//
// Note that the TypeScript is never discarded while the script has a
// BaselineScript, so if those checks hold now they must hold at least until
// the BaselineScript is discarded and when that happens the import is
// patched back.
if (!TypeScript::ThisTypes(script)->hasType(TypeSet::UndefinedType()))
return true;
for (uint32_t i = 0; i < importFun->nargs(); i++) {
TypeSet::Type type = TypeSet::UnknownType();
switch (fi.sig().args()[i]) {
case ValType::I32: type = TypeSet::Int32Type(); break;
case ValType::I64: MOZ_CRASH("can't happen because of above guard");
case ValType::F32: type = TypeSet::DoubleType(); break;
case ValType::F64: type = TypeSet::DoubleType(); break;
case ValType::I8x16: MOZ_CRASH("NYI");
case ValType::I16x8: MOZ_CRASH("NYI");
case ValType::I32x4: MOZ_CRASH("NYI");
case ValType::F32x4: MOZ_CRASH("NYI");
case ValType::B8x16: MOZ_CRASH("NYI");
case ValType::B16x8: MOZ_CRASH("NYI");
case ValType::B32x4: MOZ_CRASH("NYI");
}
if (!TypeScript::ArgTypes(script, i)->hasType(type))
return true;
}
// Let's optimize it!
if (!script->baselineScript()->addDependentWasmImport(cx, *this, funcImportIndex))
return false;
import.code = jitExitCode;
import.baselineScript = script->baselineScript();
return true;
}
/* static */ int32_t
Instance::callImport_void(Instance* instance, int32_t funcImportIndex, int32_t argc, uint64_t* argv)
{
JSContext* cx = instance->cx();
RootedValue rval(cx);
return instance->callImport(cx, funcImportIndex, argc, argv, &rval);
}
/* static */ int32_t
Instance::callImport_i32(Instance* instance, int32_t funcImportIndex, int32_t argc, uint64_t* argv)
{
JSContext* cx = instance->cx();
RootedValue rval(cx);
if (!instance->callImport(cx, funcImportIndex, argc, argv, &rval))
return false;
return ToInt32(cx, rval, (int32_t*)argv);
}
/* static */ int32_t
Instance::callImport_i64(Instance* instance, int32_t funcImportIndex, int32_t argc, uint64_t* argv)
{
JSContext* cx = instance->cx();
RootedValue rval(cx);
if (!instance->callImport(cx, funcImportIndex, argc, argv, &rval))
return false;
return ReadI64Object(cx, rval, (int64_t*)argv);
}
/* static */ int32_t
Instance::callImport_f64(Instance* instance, int32_t funcImportIndex, int32_t argc, uint64_t* argv)
{
JSContext* cx = instance->cx();
RootedValue rval(cx);
if (!instance->callImport(cx, funcImportIndex, argc, argv, &rval))
return false;
return ToNumber(cx, rval, (double*)argv);
}
/* static */ uint32_t
Instance::growMemory_i32(Instance* instance, uint32_t delta)
{
MOZ_ASSERT(!instance->isAsmJS());
JSContext* cx = instance->cx();
RootedWasmMemoryObject memory(cx, instance->memory_);
uint32_t ret = WasmMemoryObject::grow(memory, delta, cx);
// If there has been a moving grow, this Instance should have been notified.
MOZ_RELEASE_ASSERT(instance->tlsData_.memoryBase ==
instance->memory_->buffer().dataPointerEither());
return ret;
}
/* static */ uint32_t
Instance::currentMemory_i32(Instance* instance)
{
uint32_t byteLength = instance->memoryLength();
MOZ_ASSERT(byteLength % wasm::PageSize == 0);
return byteLength / wasm::PageSize;
}
Instance::Instance(JSContext* cx,
Handle<WasmInstanceObject*> object,
UniqueCode code,
HandleWasmMemoryObject memory,
SharedTableVector&& tables,
Handle<FunctionVector> funcImports,
const ValVector& globalImports)
: compartment_(cx->compartment()),
object_(object),
code_(Move(code)),
memory_(memory),
tables_(Move(tables))
{
MOZ_ASSERT(funcImports.length() == metadata().funcImports.length());
MOZ_ASSERT(tables_.length() == metadata().tables.length());
tlsData_.cx = cx;
tlsData_.instance = this;
tlsData_.globalData = code_->segment().globalData();
tlsData_.memoryBase = memory ? memory->buffer().dataPointerEither().unwrap() : nullptr;
tlsData_.stackLimit = *(void**)cx->stackLimitAddressForJitCode(StackForUntrustedScript);
for (size_t i = 0; i < metadata().funcImports.length(); i++) {
HandleFunction f = funcImports[i];
const FuncImport& fi = metadata().funcImports[i];
FuncImportTls& import = funcImportTls(fi);
if (!isAsmJS() && IsExportedWasmFunction(f)) {
WasmInstanceObject* calleeInstanceObj = ExportedFunctionToInstanceObject(f);
const CodeRange& codeRange = calleeInstanceObj->getExportedFunctionCodeRange(f);
Instance& calleeInstance = calleeInstanceObj->instance();
import.tls = &calleeInstance.tlsData_;
import.code = calleeInstance.codeSegment().base() + codeRange.funcNonProfilingEntry();
import.baselineScript = nullptr;
import.obj = calleeInstanceObj;
} else {
import.tls = &tlsData_;
import.code = codeBase() + fi.interpExitCodeOffset();
import.baselineScript = nullptr;
import.obj = f;
}
}
for (size_t i = 0; i < tables_.length(); i++) {
const TableDesc& td = metadata().tables[i];
TableTls& table = tableTls(td);
table.length = tables_[i]->length();
table.base = tables_[i]->base();
}
uint8_t* globalData = code_->segment().globalData();
for (size_t i = 0; i < metadata().globals.length(); i++) {
const GlobalDesc& global = metadata().globals[i];
if (global.isConstant())
continue;
uint8_t* globalAddr = globalData + global.offset();
switch (global.kind()) {
case GlobalKind::Import: {
globalImports[global.importIndex()].writePayload(globalAddr);
break;
}
case GlobalKind::Variable: {
const InitExpr& init = global.initExpr();
switch (init.kind()) {
case InitExpr::Kind::Constant: {
init.val().writePayload(globalAddr);
break;
}
case InitExpr::Kind::GetGlobal: {
const GlobalDesc& imported = metadata().globals[init.globalIndex()];
globalImports[imported.importIndex()].writePayload(globalAddr);
break;
}
}
break;
}
case GlobalKind::Constant: {
MOZ_CRASH("skipped at the top");
}
}
}
}
bool
Instance::init(JSContext* cx)
{
if (memory_ && memory_->movingGrowable() && !memory_->addMovingGrowObserver(cx, object_))
return false;
for (const SharedTable& table : tables_) {
if (table->movingGrowable() && !table->addMovingGrowObserver(cx, object_))
return false;
}
if (!metadata().sigIds.empty()) {
ExclusiveData<SigIdSet>::Guard lockedSigIdSet = sigIdSet->lock();
if (!lockedSigIdSet->ensureInitialized(cx))
return false;
for (const SigWithId& sig : metadata().sigIds) {
const void* sigId;
if (!lockedSigIdSet->allocateSigId(cx, sig, &sigId))
return false;
*addressOfSigId(sig.id) = sigId;
}
}
return true;
}
Instance::~Instance()
{
compartment_->wasm.unregisterInstance(*this);
for (unsigned i = 0; i < metadata().funcImports.length(); i++) {
FuncImportTls& import = funcImportTls(metadata().funcImports[i]);
if (import.baselineScript)
import.baselineScript->removeDependentWasmImport(*this, i);
}
if (!metadata().sigIds.empty()) {
ExclusiveData<SigIdSet>::Guard lockedSigIdSet = sigIdSet->lock();
for (const SigWithId& sig : metadata().sigIds) {
if (const void* sigId = *addressOfSigId(sig.id))
lockedSigIdSet->deallocateSigId(sig, sigId);
}
}
}
size_t
Instance::memoryMappedSize() const
{
return memory_->buffer().wasmMappedSize();
}
bool
Instance::memoryAccessInGuardRegion(uint8_t* addr, unsigned numBytes) const
{
MOZ_ASSERT(numBytes > 0);
if (!metadata().usesMemory())
return false;
uint8_t* base = memoryBase().unwrap(/* comparison */);
if (addr < base)
return false;
size_t lastByteOffset = addr - base + (numBytes - 1);
return lastByteOffset >= memoryLength() && lastByteOffset < memoryMappedSize();
}
void
Instance::tracePrivate(JSTracer* trc)
{
// This method is only called from WasmInstanceObject so the only reason why
// TraceEdge is called is so that the pointer can be updated during a moving
// GC. TraceWeakEdge may sound better, but it is less efficient given that
// we know object_ is already marked.
MOZ_ASSERT(!gc::IsAboutToBeFinalized(&object_));
TraceEdge(trc, &object_, "wasm instance object");
for (const FuncImport& fi : metadata().funcImports)
TraceNullableEdge(trc, &funcImportTls(fi).obj, "wasm import");
for (const SharedTable& table : tables_)
table->trace(trc);
TraceNullableEdge(trc, &memory_, "wasm buffer");
}
void
Instance::trace(JSTracer* trc)
{
// Technically, instead of having this method, the caller could use
// Instance::object() to get the owning WasmInstanceObject to mark,
// but this method is simpler and more efficient. The trace hook of
// WasmInstanceObject will call Instance::tracePrivate at which point we
// can mark the rest of the children.
TraceEdge(trc, &object_, "wasm instance object");
}
SharedMem<uint8_t*>
Instance::memoryBase() const
{
MOZ_ASSERT(metadata().usesMemory());
MOZ_ASSERT(tlsData_.memoryBase == memory_->buffer().dataPointerEither());
return memory_->buffer().dataPointerEither();
}
size_t
Instance::memoryLength() const
{
return memory_->buffer().byteLength();
}
WasmInstanceObject*
Instance::objectUnbarriered() const
{
return object_.unbarrieredGet();
}
WasmInstanceObject*
Instance::object() const
{
return object_;
}
bool
Instance::callExport(JSContext* cx, uint32_t funcIndex, CallArgs args)
{
// If there has been a moving grow, this Instance should have been notified.
MOZ_RELEASE_ASSERT(!memory_ || tlsData_.memoryBase == memory_->buffer().dataPointerEither());
if (!cx->compartment()->wasm.ensureProfilingState(cx))
return false;
const FuncExport& func = metadata().lookupFuncExport(funcIndex);
// The calling convention for an external call into wasm is to pass an
// array of 16-byte values where each value contains either a coerced int32
// (in the low word), a double value (in the low dword) or a SIMD vector
// value, with the coercions specified by the wasm signature. The external
// entry point unpacks this array into the system-ABI-specified registers
// and stack memory and then calls into the internal entry point. The return
// value is stored in the first element of the array (which, therefore, must
// have length >= 1).
Vector<ExportArg, 8> exportArgs(cx);
if (!exportArgs.resize(Max<size_t>(1, func.sig().args().length())))
return false;
RootedValue v(cx);
for (unsigned i = 0; i < func.sig().args().length(); ++i) {
v = i < args.length() ? args[i] : UndefinedValue();
switch (func.sig().arg(i)) {
case ValType::I32:
if (!ToInt32(cx, v, (int32_t*)&exportArgs[i]))
return false;
break;
case ValType::I64:
if (!JitOptions.wasmTestMode) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_WASM_BAD_I64);
return false;
}
if (!ReadI64Object(cx, v, (int64_t*)&exportArgs[i]))
return false;
break;
case ValType::F32:
if (JitOptions.wasmTestMode && v.isObject()) {
if (!ReadCustomFloat32NaNObject(cx, v, (uint32_t*)&exportArgs[i]))
return false;
break;
}
if (!RoundFloat32(cx, v, (float*)&exportArgs[i]))
return false;
break;
case ValType::F64:
if (JitOptions.wasmTestMode && v.isObject()) {
if (!ReadCustomDoubleNaNObject(cx, v, (uint64_t*)&exportArgs[i]))
return false;
break;
}
if (!ToNumber(cx, v, (double*)&exportArgs[i]))
return false;
break;
case ValType::I8x16: {
SimdConstant simd;
if (!ToSimdConstant<Int8x16>(cx, v, &simd))
return false;
memcpy(&exportArgs[i], simd.asInt8x16(), Simd128DataSize);
break;
}
case ValType::I16x8: {
SimdConstant simd;
if (!ToSimdConstant<Int16x8>(cx, v, &simd))
return false;
memcpy(&exportArgs[i], simd.asInt16x8(), Simd128DataSize);
break;
}
case ValType::I32x4: {
SimdConstant simd;
if (!ToSimdConstant<Int32x4>(cx, v, &simd))
return false;
memcpy(&exportArgs[i], simd.asInt32x4(), Simd128DataSize);
break;
}
case ValType::F32x4: {
SimdConstant simd;
if (!ToSimdConstant<Float32x4>(cx, v, &simd))
return false;
memcpy(&exportArgs[i], simd.asFloat32x4(), Simd128DataSize);
break;
}
case ValType::B8x16: {
SimdConstant simd;
if (!ToSimdConstant<Bool8x16>(cx, v, &simd))
return false;
// Bool8x16 uses the same representation as Int8x16.
memcpy(&exportArgs[i], simd.asInt8x16(), Simd128DataSize);
break;
}
case ValType::B16x8: {
SimdConstant simd;
if (!ToSimdConstant<Bool16x8>(cx, v, &simd))
return false;
// Bool16x8 uses the same representation as Int16x8.
memcpy(&exportArgs[i], simd.asInt16x8(), Simd128DataSize);
break;
}
case ValType::B32x4: {
SimdConstant simd;
if (!ToSimdConstant<Bool32x4>(cx, v, &simd))
return false;
// Bool32x4 uses the same representation as Int32x4.
memcpy(&exportArgs[i], simd.asInt32x4(), Simd128DataSize);
break;
}
}
}
{
// Push a WasmActivation to describe the wasm frames we're about to push
// when running this module. Additionally, push a JitActivation so that
// the optimized wasm-to-Ion FFI call path (which we want to be very
// fast) can avoid doing so. The JitActivation is marked as inactive so
// stack iteration will skip over it.
WasmActivation activation(cx);
JitActivation jitActivation(cx, /* active */ false);
// Call the per-exported-function trampoline created by GenerateEntry.
auto funcPtr = JS_DATA_TO_FUNC_PTR(ExportFuncPtr, codeBase() + func.entryOffset());
if (!CALL_GENERATED_2(funcPtr, exportArgs.begin(), &tlsData_))
return false;
}
if (isAsmJS() && args.isConstructing()) {
// By spec, when a JS function is called as a constructor and this
// function returns a primary type, which is the case for all asm.js
// exported functions, the returned value is discarded and an empty
// object is returned instead.
PlainObject* obj = NewBuiltinClassInstance<PlainObject>(cx);
if (!obj)
return false;
args.rval().set(ObjectValue(*obj));
return true;
}
void* retAddr = &exportArgs[0];
JSObject* retObj = nullptr;
switch (func.sig().ret()) {
case ExprType::Void:
args.rval().set(UndefinedValue());
break;
case ExprType::I32:
args.rval().set(Int32Value(*(int32_t*)retAddr));
break;
case ExprType::I64:
if (!JitOptions.wasmTestMode) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_WASM_BAD_I64);
return false;
}
retObj = CreateI64Object(cx, *(int64_t*)retAddr);
if (!retObj)
return false;
break;
case ExprType::F32:
if (JitOptions.wasmTestMode && IsNaN(*(float*)retAddr)) {
retObj = CreateCustomNaNObject(cx, (float*)retAddr);
if (!retObj)
return false;
break;
}
args.rval().set(NumberValue(*(float*)retAddr));
break;
case ExprType::F64:
if (JitOptions.wasmTestMode && IsNaN(*(double*)retAddr)) {
retObj = CreateCustomNaNObject(cx, (double*)retAddr);
if (!retObj)
return false;
break;
}
args.rval().set(NumberValue(*(double*)retAddr));
break;
case ExprType::I8x16:
retObj = CreateSimd<Int8x16>(cx, (int8_t*)retAddr);
if (!retObj)
return false;
break;
case ExprType::I16x8:
retObj = CreateSimd<Int16x8>(cx, (int16_t*)retAddr);
if (!retObj)
return false;
break;
case ExprType::I32x4:
retObj = CreateSimd<Int32x4>(cx, (int32_t*)retAddr);
if (!retObj)
return false;
break;
case ExprType::F32x4:
retObj = CreateSimd<Float32x4>(cx, (float*)retAddr);
if (!retObj)
return false;
break;
case ExprType::B8x16:
retObj = CreateSimd<Bool8x16>(cx, (int8_t*)retAddr);
if (!retObj)
return false;
break;
case ExprType::B16x8:
retObj = CreateSimd<Bool16x8>(cx, (int16_t*)retAddr);
if (!retObj)
return false;
break;
case ExprType::B32x4:
retObj = CreateSimd<Bool32x4>(cx, (int32_t*)retAddr);
if (!retObj)
return false;
break;
case ExprType::Limit:
MOZ_CRASH("Limit");
}
if (retObj)
args.rval().set(ObjectValue(*retObj));
return true;
}
void
Instance::onMovingGrowMemory(uint8_t* prevMemoryBase)
{
MOZ_ASSERT(!isAsmJS());
ArrayBufferObject& buffer = memory_->buffer().as<ArrayBufferObject>();
tlsData_.memoryBase = buffer.dataPointer();
code_->segment().onMovingGrow(prevMemoryBase, metadata(), buffer);
}
void
Instance::onMovingGrowTable()
{
MOZ_ASSERT(!isAsmJS());
MOZ_ASSERT(tables_.length() == 1);
TableTls& table = tableTls(metadata().tables[0]);
table.length = tables_[0]->length();
table.base = tables_[0]->base();
}
void
Instance::deoptimizeImportExit(uint32_t funcImportIndex)
{
const FuncImport& fi = metadata().funcImports[funcImportIndex];
FuncImportTls& import = funcImportTls(fi);
import.code = codeBase() + fi.interpExitCodeOffset();
import.baselineScript = nullptr;
}
static void
UpdateEntry(const Code& code, bool profilingEnabled, void** entry)
{
const CodeRange& codeRange = *code.lookupRange(*entry);
void* from = code.segment().base() + codeRange.funcNonProfilingEntry();
void* to = code.segment().base() + codeRange.funcProfilingEntry();
if (!profilingEnabled)
Swap(from, to);
MOZ_ASSERT(*entry == from);
*entry = to;
}
bool
Instance::ensureProfilingState(JSContext* cx, bool newProfilingEnabled)
{
if (code_->profilingEnabled() == newProfilingEnabled)
return true;
if (!code_->ensureProfilingState(cx, newProfilingEnabled))
return false;
// Imported wasm functions and typed function tables point directly to
// either the profiling or non-profiling prologue and must therefore be
// updated when the profiling mode is toggled.
for (const FuncImport& fi : metadata().funcImports) {
FuncImportTls& import = funcImportTls(fi);
if (import.obj && import.obj->is<WasmInstanceObject>()) {
Code& code = import.obj->as<WasmInstanceObject>().instance().code();
UpdateEntry(code, newProfilingEnabled, &import.code);
}
}
for (const SharedTable& table : tables_) {
if (!table->isTypedFunction())
continue;
// This logic will have to be generalized to match the import logic
// above if wasm can create typed function tables since a single table
// can contain elements from multiple instances.
MOZ_ASSERT(metadata().kind == ModuleKind::AsmJS);
void** array = table->internalArray();
uint32_t length = table->length();
for (size_t i = 0; i < length; i++) {
if (array[i])
UpdateEntry(*code_, newProfilingEnabled, &array[i]);
}
}
return true;
}
void
Instance::addSizeOfMisc(MallocSizeOf mallocSizeOf,
Metadata::SeenSet* seenMetadata,
ShareableBytes::SeenSet* seenBytes,
Table::SeenSet* seenTables,
size_t* code,
size_t* data) const
{
*data += mallocSizeOf(this);
code_->addSizeOfMisc(mallocSizeOf, seenMetadata, seenBytes, code, data);
for (const SharedTable& table : tables_)
*data += table->sizeOfIncludingThisIfNotSeen(mallocSizeOf, seenTables);
}
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