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Copy pathWasmOperations.cpp
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1866 lines (1631 loc) · 89 KB
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/*
* Copyright (C) 2019-2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WasmOperations.h"
#include "DeferGC.h"
#include "ObjectAllocationProfile.h"
#if ENABLE(WEBASSEMBLY)
#include "ButterflyInlines.h"
#include "FrameTracers.h"
#include "GCMemoryOperations.h"
#include "IteratorOperations.h"
#include "JITExceptions.h"
#include "JSArrayBufferViewInlines.h"
#include "JSCJSValueInlines.h"
#include "JSGlobalObjectInlines.h"
#include "JSWebAssemblyArray.h"
#include "JSWebAssemblyException.h"
#include "JSWebAssemblyHelpers.h"
#include "JSWebAssemblyInstance.h"
#include "JSWebAssemblyRuntimeError.h"
#include "JSWebAssemblyStruct.h"
#include "ProbeContext.h"
#include "ReleaseHeapAccessScope.h"
#include "WasmCallee.h"
#include "WasmCallingConvention.h"
#include "WasmContext.h"
#include "WasmMemory.h"
#include "WasmModuleInformation.h"
#include "WasmOMGPlan.h"
#include "WasmOSREntryData.h"
#include "WasmOSREntryPlan.h"
#include "WasmOperationsInlines.h"
#include "WasmWorklist.h"
#include <algorithm>
#include <bit>
#include <span>
#include <string.h>
#include <wtf/DataLog.h>
#include <wtf/Locker.h>
#include <wtf/StdLibExtras.h>
IGNORE_WARNINGS_BEGIN("frame-address")
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
namespace Wasm {
namespace WasmOperationsInternal {
static constexpr bool verbose = false;
}
JSC_DEFINE_JIT_OPERATION(operationJSToWasmEntryWrapperBuildFrame, JSToWasmCallee*, (void* sp, CallFrame* callFrame, WebAssemblyFunction* function))
{
dataLogLnIf(WasmOperationsInternal::verbose, "operationJSToWasmEntryWrapperBuildFrame sp: ", RawPointer(sp), " fp: ", RawPointer(callFrame));
auto* globalObject = function->realm();
VM& vm = globalObject->vm();
if (function->taintedness() >= SourceTaintedOrigin::IndirectlyTainted)
vm.setMightBeExecutingTaintedCode();
WasmOperationPrologueCallFrameTracer tracer(vm, callFrame, OUR_RETURN_ADDRESS);
auto* callee = function->jsToWasmCallee();
ASSERT(function);
ASSERT(callee->compilationMode() == CompilationMode::JSToWasmMode);
ASSERT(&callee->rtt() == function->rtt());
ASSERT(callee->frameSize() + JSToWasmCallee::SpillStackSpaceAligned == (reinterpret_cast<uintptr_t>(callFrame) - reinterpret_cast<uintptr_t>(sp)));
dataLogLnIf(WasmOperationsInternal::verbose, "operationJSToWasmEntryWrapperBuildFrame setting callee: ", RawHex(CalleeBits::encodeNativeCallee(callee)));
dataLogLnIf(WasmOperationsInternal::verbose, "operationJSToWasmEntryWrapperBuildFrame wasm callee: ", RawHex(callee->wasmCallee().encodedBits()));
auto scope = DECLARE_THROW_SCOPE(vm);
auto calleeSPOffsetFromFP = -(static_cast<intptr_t>(callee->frameSize()) + JSToWasmCallee::SpillStackSpaceAligned - JSToWasmCallee::RegisterStackSpaceAligned);
const RTT& signature = *function->rtt();
if (signature.argumentsOrResultsIncludeV128() || signature.argumentsOrResultsIncludeExnref()) [[unlikely]] {
throwVMTypeError(globalObject, scope, Wasm::errorMessageForExceptionType(Wasm::ExceptionType::TypeErrorInvalidValueUse));
OPERATION_RETURN(scope, callee);
}
auto access = [sp, callFrame]<typename V>(auto* arr, int i) -> V* {
dataLogLnIf(WasmOperationsInternal::verbose, "fp[", (&reinterpret_cast<uint8_t*>(arr)[i / sizeof(uint8_t)] - reinterpret_cast<uint8_t*>(callFrame)), "] sp[", (&reinterpret_cast<uint8_t*>(arr)[i / sizeof(uint8_t)] - reinterpret_cast<uint8_t*>(sp)), "](", RawHex(reinterpret_cast<V*>(arr)[i / sizeof(V)]), ")");
return &reinterpret_cast<V*>(arr)[i / sizeof(V)];
};
CallInformation wasmFrameConvention = wasmCallingConvention().callInformationFor(signature, CallRole::Caller);
uint64_t* registerSpace = reinterpret_cast<uint64_t*>(sp);
for (unsigned i = 0; i < signature.argumentCount(); ++i) {
JSValue jsArg = callFrame->argument(i);
Type type = signature.argumentType(i);
dataLogLnIf(WasmOperationsInternal::verbose, "Arg ", i, " ", wasmFrameConvention.params[i].location);
uint64_t value = toWebAssemblyValue(globalObject, type, jsArg);
OPERATION_RETURN_IF_EXCEPTION(scope, callee);
if (wasmFrameConvention.params[i].location.isStackArgument()) {
auto dst = wasmFrameConvention.params[i].location.offsetFromSP() + calleeSPOffsetFromFP;
if (type.isI32() || type.isF32())
*access.operator()<uint32_t>(callFrame, dst) = static_cast<uint32_t>(value);
else
*access.operator()<uint64_t>(callFrame, dst) = value;
} else {
int dst = 0;
if (wasmFrameConvention.params[i].location.isFPR())
dst = GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + FPRInfo::toArgumentIndex(wasmFrameConvention.params[i].location.fpr()) * bytesForWidth(Width::Width64);
else
dst = GPRInfo::toArgumentIndex(wasmFrameConvention.params[i].location.gpr()) * sizeof(UCPURegister);
ASSERT(dst >= 0);
dataLogLnIf(WasmOperationsInternal::verbose, "* Register Arg ", i, " ", dst);
if (type.isI32() || type.isF32())
value = static_cast<uint64_t>(static_cast<uint32_t>(value));
*access.operator()<uint64_t>(registerSpace, dst) = value;
}
}
OPERATION_RETURN(scope, callee);
}
// Marshalls wasm return values into JS: a single JSValue for one result, or a JSArray for multi-value.
JSC_DEFINE_JIT_OPERATION(operationJSToWasmEntryWrapperBuildReturnFrame, EncodedJSValue, (void* sp, CallFrame* callFrame))
{
dataLogLnIf(WasmOperationsInternal::verbose, "operationJSToWasmEntryWrapperBuildReturnFrame sp: ", RawPointer(sp), " fp: ", RawPointer(callFrame));
auto* instance = callFrame->wasmInstance();
ASSERT(instance);
ASSERT(instance->realm());
VM& vm = instance->vm();
WasmOperationPrologueCallFrameTracer tracer(vm, callFrame, OUR_RETURN_ADDRESS);
uint64_t* registerSpace = reinterpret_cast<uint64_t*>(sp);
auto* callee = uncheckedDowncast<JSToWasmCallee>(uncheckedDowncast<Wasm::Callee>(callFrame->callee().asNativeCallee()));
ASSERT(callee->compilationMode() == CompilationMode::JSToWasmMode);
auto scope = DECLARE_THROW_SCOPE(vm);
const RTT& signature = callee->rtt();
auto access = [sp, callFrame]<typename V>(auto* arr, int i) -> V* {
dataLogLnIf(WasmOperationsInternal::verbose, "fp[", (&reinterpret_cast<uint8_t*>(arr)[i / sizeof(uint8_t)] - reinterpret_cast<uint8_t*>(callFrame)), "] sp[", (&reinterpret_cast<uint8_t*>(arr)[i / sizeof(uint8_t)] - reinterpret_cast<uint8_t*>(sp)), "](", reinterpret_cast<V*>(arr)[i / sizeof(V)], ")");
return &reinterpret_cast<V*>(arr)[i / sizeof(V)];
};
if (signature.returnsVoid())
OPERATION_RETURN(scope, JSValue::encode(jsUndefined()));
if (signature.returnCount() == 1) {
if constexpr (WasmOperationsInternal::verbose) {
CallInformation wasmFrameConvention = wasmCallingConvention().callInformationFor(signature, CallRole::Caller);
dataLogLn("* Register Return ", wasmFrameConvention.results[0].location);
}
JSValue result;
if (signature.returnType(0).isI32())
result = jsNumber(*access.operator()<int32_t>(registerSpace, 0));
else if (signature.returnType(0).isI64()) {
result = JSBigInt::makeHeapBigIntOrBigInt32(instance->realm(), *access.operator()<int64_t>(registerSpace, 0));
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
} else if (signature.returnType(0).isF32())
result = jsNumber(purifyNaN(*access.operator()<float>(registerSpace, GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + 0)));
else if (signature.returnType(0).isF64())
result = jsNumber(purifyNaN(*access.operator()<double>(registerSpace, GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + 0)));
else if (isRefType(signature.returnType(0)))
result = *access.operator()<JSValue>(registerSpace, 0);
else
// the JIT thunk emits a breakpoint here, so we can just fail our assertion as well
RELEASE_ASSERT_NOT_REACHED();
OPERATION_RETURN(scope, JSValue::encode(result));
}
CallInformation wasmFrameConvention = wasmCallingConvention().callInformationFor(signature, CallRole::Caller);
IndexingType indexingType = ArrayWithUndecided;
for (unsigned i = 0; i < signature.returnCount(); ++i) {
Type type = signature.returnType(i);
switch (type.kind()) {
case TypeKind::I32:
indexingType = leastUpperBoundOfIndexingTypes(indexingType, ArrayWithInt32);
break;
case TypeKind::F32:
case TypeKind::F64:
indexingType = leastUpperBoundOfIndexingTypes(indexingType, ArrayWithDouble);
break;
default:
indexingType = leastUpperBoundOfIndexingTypes(indexingType, ArrayWithContiguous);
break;
}
}
JSGlobalObject* globalObject = instance->realm();
JSArray* resultArray = JSArray::tryCreate(vm, globalObject->arrayStructureForIndexingTypeDuringAllocation(indexingType), signature.returnCount());
if (!resultArray) [[unlikely]] {
throwOutOfMemoryError(globalObject, scope);
OPERATION_RETURN(scope, encodedJSValue());
}
// calleeSP = sp + RegisterStackSpaceAligned (we only subtracted RegisterStackSpace from callee's actual SP)
// This is correct even after tail calls, where the callee's frame size may differ from the original.
auto calleeSPOffsetFromFP = reinterpret_cast<intptr_t>(sp)
+ static_cast<intptr_t>(JSToWasmCallee::RegisterStackSpaceAligned)
- reinterpret_cast<intptr_t>(callFrame);
for (unsigned i = 0; i < signature.returnCount(); ++i) {
ValueLocation loc = wasmFrameConvention.results[i].location;
Type type = signature.returnType(i);
JSValue result;
if (loc.isGPR() || loc.isFPR()) {
switch (type.kind()) {
case TypeKind::I32:
result = jsNumber(*access.operator()<int32_t>(registerSpace, GPRInfo::toArgumentIndex(loc.gpr()) * sizeof(UCPURegister)));
break;
case TypeKind::I64:
result = JSBigInt::makeHeapBigIntOrBigInt32(globalObject, *access.operator()<int64_t>(registerSpace, GPRInfo::toArgumentIndex(loc.gpr()) * sizeof(UCPURegister)));
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
break;
case TypeKind::F32:
result = jsNumber(purifyNaN(*access.operator()<float>(registerSpace, GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + FPRInfo::toArgumentIndex(loc.fpr()) * bytesForWidth(Width::Width64))));
break;
case TypeKind::F64:
result = jsNumber(purifyNaN(*access.operator()<double>(registerSpace, GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + FPRInfo::toArgumentIndex(loc.fpr()) * bytesForWidth(Width::Width64))));
break;
default:
result = *access.operator()<JSValue>(registerSpace, GPRInfo::toArgumentIndex(loc.gpr()) * sizeof(UCPURegister));
break;
}
} else {
switch (type.kind()) {
case TypeKind::I32:
result = jsNumber(*access.operator()<int32_t>(callFrame, calleeSPOffsetFromFP + loc.offsetFromSP()));
break;
case TypeKind::I64:
result = JSBigInt::makeHeapBigIntOrBigInt32(globalObject, *access.operator()<int64_t>(callFrame, calleeSPOffsetFromFP + loc.offsetFromSP()));
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
break;
case TypeKind::F32:
result = jsNumber(purifyNaN(*access.operator()<float>(callFrame, calleeSPOffsetFromFP + loc.offsetFromSP())));
break;
case TypeKind::F64:
result = jsNumber(purifyNaN(*access.operator()<double>(callFrame, calleeSPOffsetFromFP + loc.offsetFromSP())));
break;
default:
result = *access.operator()<JSValue>(callFrame, calleeSPOffsetFromFP + loc.offsetFromSP());
break;
}
}
resultArray->putDirectIndex(globalObject, i, result);
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
}
OPERATION_RETURN(scope, JSValue::encode(resultArray));
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationGetWasmCalleeStackSize, UCPUStrictInt32, (JSWebAssemblyInstance*, WasmCallableFunction* functionInfo))
{
const RTT& signature = *static_cast<WasmOrJSImportableFunctionCallLinkInfo*>(functionInfo)->rtt;
unsigned argCount = signature.argumentCount();
const auto& wasmCC = wasmCallingConvention();
CallInformation wasmCallInfo = wasmCC.callInformationFor(signature, CallRole::Callee);
RegisterAtOffsetList savedResultRegisters = wasmCallInfo.computeResultsOffsetList();
const unsigned numberOfParameters = argCount + 1; // There is a "this" argument.
const unsigned numberOfRegsForCall = CallFrame::headerSizeInRegisters + roundArgumentCountToAlignFrame(numberOfParameters);
ASSERT(!(numberOfRegsForCall % stackAlignmentRegisters()));
const unsigned numberOfBytesForCall = numberOfRegsForCall * sizeof(Register) - sizeof(CallerFrameAndPC);
const unsigned numberOfBytesForSavedResults = savedResultRegisters.sizeOfAreaInBytes();
const unsigned stackOffset = WTF::roundUpToMultipleOf<stackAlignmentBytes()>(std::max(numberOfBytesForCall, numberOfBytesForSavedResults));
return toUCPUStrictInt32(stackOffset);
}
JSC_DEFINE_JIT_OPERATION(operationWasmToJSExitMarshalArguments, void, (void* sp, CallFrame* callFrame, void* argumentRegisters, JSWebAssemblyInstance* instance))
{
auto access = []<typename V>(auto* arr, int i) -> V* {
return &reinterpret_cast<V*>(arr)[i / sizeof(V)];
};
// We need to set up them immediately before potentially throwing anything.
auto singletonCallee = CalleeBits::boxNativeCallee(&WasmToJSCallee::singleton());
*access.operator()<uintptr_t>(callFrame, CallFrameSlot::codeBlock * sizeof(Register)) = std::bit_cast<uintptr_t>(instance);
*access.operator()<uintptr_t>(callFrame, CallFrameSlot::callee * sizeof(Register)) = std::bit_cast<uintptr_t>(singletonCallee);
CallFrame* calleeFrame = std::bit_cast<CallFrame*>(reinterpret_cast<uintptr_t>(sp) - sizeof(CallerFrameAndPC));
ASSERT(instance);
JSGlobalObject* globalObject = instance->realm();
ASSERT(globalObject);
VM& vm = instance->vm();
WasmOperationPrologueCallFrameTracer tracer(vm, callFrame, OUR_RETURN_ADDRESS);
auto scope = DECLARE_THROW_SCOPE(vm);
auto* importableFunction = *access.operator()<WasmOrJSImportableFunctionCallLinkInfo*>(callFrame, WasmToJSCallableFunctionSlot);
const RTT& signature = *importableFunction->rtt;
unsigned argCount = signature.argumentCount();
if (signature.argumentsOrResultsIncludeV128() || signature.argumentsOrResultsIncludeExnref()) [[unlikely]] {
throwVMTypeError(globalObject, scope, Wasm::errorMessageForExceptionType(Wasm::ExceptionType::TypeErrorInvalidValueUse));
OPERATION_RETURN(scope);
}
const auto& wasmCC = wasmCallingConvention().callInformationFor(signature, CallRole::Callee);
const auto& jsCC = jsCallingConvention().callInformationFor(signature, CallRole::Callee);
for (unsigned argNum = 0; argNum < argCount; ++argNum) {
Type argType = signature.argumentType(argNum);
auto wasmParam = wasmCC.params[argNum].location;
auto dst = jsCC.params[argNum].location.offsetFromFP();
switch (argType.kind()) {
case TypeKind::Void:
case TypeKind::Structref:
case TypeKind::Arrayref:
case TypeKind::Eqref:
case TypeKind::Anyref:
case TypeKind::Noexnref:
case TypeKind::Noneref:
case TypeKind::Nofuncref:
case TypeKind::Noexternref:
case TypeKind::I31ref:
case TypeKind::V128:
RELEASE_ASSERT_NOT_REACHED();
case TypeKind::RefNull:
case TypeKind::Ref:
case TypeKind::Externref:
case TypeKind::Funcref:
case TypeKind::Exnref:
case TypeKind::I32: {
if (wasmParam.isStack()) {
uint64_t raw = *access.operator()<UCPURegister>(callFrame, wasmParam.offsetFromFP());
if (argType.isI32())
*access.operator()<uint64_t>(calleeFrame, dst) = static_cast<uint32_t>(raw) | JSValue::NumberTag;
else
*access.operator()<uint64_t>(calleeFrame, dst) = raw;
} else {
auto raw = *access.operator()<UCPURegister>(argumentRegisters, GPRInfo::toArgumentIndex(wasmParam.gpr()) * sizeof(UCPURegister));
if (argType.isI32())
*access.operator()<uint64_t>(calleeFrame, dst) = static_cast<uint32_t>(raw) | JSValue::NumberTag;
else
*access.operator()<uint64_t>(calleeFrame, dst) = raw;
}
break;
}
case TypeKind::I64: {
if (wasmParam.isStack()) {
auto result = JSBigInt::makeHeapBigIntOrBigInt32(globalObject, *access.operator()<int64_t>(callFrame, wasmParam.offsetFromFP()));
OPERATION_RETURN_IF_EXCEPTION(scope);
*access.operator()<uint64_t>(calleeFrame, dst) = JSValue::encode(result);
} else {
auto result = JSBigInt::makeHeapBigIntOrBigInt32(globalObject, *access.operator()<int64_t>(argumentRegisters, GPRInfo::toArgumentIndex(wasmParam.gpr()) * sizeof(UCPURegister)));
OPERATION_RETURN_IF_EXCEPTION(scope);
*access.operator()<uint64_t>(calleeFrame, dst) = JSValue::encode(result);
}
break;
}
case TypeKind::F32: {
float val;
if (wasmParam.isStack())
val = *access.operator()<float>(callFrame, wasmParam.offsetFromFP());
else
val = *access.operator()<float>(argumentRegisters, GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + FPRInfo::toArgumentIndex(wasmParam.fpr()) * bytesForWidth(Width::Width64));
double marshalled = purifyNaN(val);
uint64_t raw = std::bit_cast<uint64_t>(marshalled);
raw += JSValue::DoubleEncodeOffset;
*access.operator()<uint64_t>(calleeFrame, dst) = raw;
break;
}
case TypeKind::F64:
double val;
if (wasmParam.isStack())
val = *access.operator()<double>(callFrame, wasmParam.offsetFromFP());
else
val = *access.operator()<double>(argumentRegisters, GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + FPRInfo::toArgumentIndex(wasmParam.fpr()) * bytesForWidth(Width::Width64));
double marshalled = purifyNaN(val);
uint64_t raw = std::bit_cast<uint64_t>(marshalled);
raw += JSValue::DoubleEncodeOffset;
*access.operator()<uint64_t>(calleeFrame, dst) = raw;
break;
}
}
// store this argument
*access.operator()<uint64_t>(calleeFrame, CallFrameSlot::thisArgument * static_cast<int>(sizeof(Register))) = JSValue::encode(jsUndefined());
// materializeImportJSCell and store
*access.operator()<uint64_t>(calleeFrame, CallFrameSlot::callee * sizeof(Register)) = JSValue::encode(importableFunction->importFunction.get());
*access.operator()<uint32_t>(calleeFrame, CallFrameSlot::argumentCountIncludingThis * static_cast<int>(sizeof(Register)) + LowWordOffset) = argCount + 1; // including this = +1
OPERATION_RETURN(scope);
}
ALWAYS_INLINE void assertCalleeIsReferenced(CallFrame* frame, JSWebAssemblyInstance* instance)
{
#if ASSERT_ENABLED
if (!frame->callee().isNativeCallee())
return;
CalleeGroup& calleeGroup = *instance->calleeGroup();
Wasm::Callee* callee = uncheckedDowncast<Wasm::Callee>(frame->callee().asNativeCallee());
TriState status;
{
Locker locker { calleeGroup.m_lock };
status = calleeGroup.calleeIsReferenced(locker, callee);
}
if (status == TriState::Indeterminate)
ASSERT(instance->vm().heap.isWasmCalleePendingDestruction(*callee));
else
ASSERT(status == TriState::True);
#else
UNUSED_PARAM(frame);
UNUSED_PARAM(instance);
#endif
}
JSC_DEFINE_JIT_OPERATION(operationWasmToJSExitMarshalReturnValues, void, (void* sp, CallFrame* callFrame, JSWebAssemblyInstance* instance))
{
auto access = []<typename V>(auto* arr, int i) -> V* {
return &reinterpret_cast<V*>(arr)[i / sizeof(V)];
};
void* registerSpace = sp;
assertCalleeIsReferenced(callFrame, instance);
WasmOperationPrologueCallFrameTracer tracer(instance->vm(), callFrame, OUR_RETURN_ADDRESS);
auto scope = DECLARE_THROW_SCOPE(instance->vm());
auto* importableFunction = *access.operator()<WasmOrJSImportableFunctionCallLinkInfo*>(callFrame, WasmToJSCallableFunctionSlot);
const RTT& signature = *importableFunction->rtt;
auto* globalObject = instance->realm();
auto wasmCC = wasmCallingConvention().callInformationFor(signature, CallRole::Callee);
JSValue returned = *(reinterpret_cast<JSValue*>(registerSpace));
if (!signature.returnCount())
OPERATION_RETURN(scope);
if (signature.returnCount() == 1) {
const auto& returnType = signature.returnType(0);
switch (returnType.kind()) {
case TypeKind::I32: {
if (!returned.isNumber() || !returned.isInt32()) {
// slow path
uint32_t result = JSValue::decode(std::bit_cast<EncodedJSValue>(returned)).toInt32(globalObject);
OPERATION_RETURN_IF_EXCEPTION(scope);
*access.operator()<uint64_t>(registerSpace, 0) = static_cast<uint64_t>(result);
} else {
uint64_t result = static_cast<uint64_t>(*access.operator()<uint32_t>(registerSpace, 0));
*access.operator()<uint64_t>(registerSpace, 0) = result;
}
break;
}
case TypeKind::I64: {
uint64_t result = JSValue::decode(std::bit_cast<EncodedJSValue>(returned)).toBigInt64(globalObject);
OPERATION_RETURN_IF_EXCEPTION(scope);
*access.operator()<uint64_t>(registerSpace, 0) = result;
break;
}
case TypeKind::F32: {
FPRReg dest = wasmCC.results[0].location.fpr();
auto offset = GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + FPRInfo::toArgumentIndex(dest) * bytesForWidth(Width::Width64);
if (returned.isNumber()) {
if (returned.isInt32()) {
float result = static_cast<float>(*access.operator()<int32_t>(registerSpace, 0));
*access.operator()<float>(registerSpace, offset) = result;
} else {
uint64_t intermediate = *access.operator()<uint64_t>(registerSpace, 0) + JSValue::NumberTag;
double d = std::bit_cast<double>(intermediate);
*access.operator()<uint64_t>(registerSpace, offset) = static_cast<uint64_t>(std::bit_cast<uint32_t>(static_cast<float>(d)));
}
} else {
float result = static_cast<float>(JSValue::decode(std::bit_cast<EncodedJSValue>(returned)).toNumber(globalObject));
OPERATION_RETURN_IF_EXCEPTION(scope);
*access.operator()<uint64_t>(registerSpace, offset) = static_cast<uint64_t>(std::bit_cast<uint32_t>(result));
}
break;
}
case TypeKind::F64: {
FPRReg dest = wasmCC.results[0].location.fpr();
auto offset = GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + FPRInfo::toArgumentIndex(dest) * bytesForWidth(Width::Width64);
if (returned.isNumber()) {
if (returned.isInt32()) {
double result = static_cast<double>(*access.operator()<int32_t>(registerSpace, 0));
*access.operator()<double>(registerSpace, offset) = result;
} else {
uint64_t intermediate = *access.operator()<uint64_t>(registerSpace, 0) + JSValue::NumberTag;
double d = std::bit_cast<double>(intermediate);
*access.operator()<double>(registerSpace, offset) = d;
}
} else {
double result = static_cast<double>(JSValue::decode(std::bit_cast<EncodedJSValue>(returned)).toNumber(globalObject));
OPERATION_RETURN_IF_EXCEPTION(scope);
*access.operator()<double>(registerSpace, offset) = result;
}
break;
}
default: {
if (Wasm::isRefType(returnType)) {
JSValue value = JSValue::decode(std::bit_cast<EncodedJSValue>(returned));
if (value.isNull() && !returnType.isNullable()) [[unlikely]] {
throwTypeError(globalObject, scope, "Host function incorrectly returned null for a nonnullable reference type"_s);
OPERATION_RETURN(scope);
}
if (Wasm::isExternref(returnType)) {
// Do nothing.
} else if (Wasm::isFuncref(returnType)) {
// operationConvertToFuncref
WebAssemblyFunction* wasmFunction = nullptr;
WebAssemblyWrapperFunction* wasmWrapperFunction = nullptr;
if (!isWebAssemblyHostFunction(value, wasmFunction, wasmWrapperFunction) && !value.isNull()) [[unlikely]] {
throwTypeError(globalObject, scope, "Funcref value is not a function"_s);
OPERATION_RETURN(scope);
}
if (isRefWithTypeIndex(returnType) && !value.isNull()) {
Wasm::TypeIndex paramIndex = returnType.index();
Wasm::TypeIndex argIndex = (wasmFunction ? wasmFunction->rtt() : wasmWrapperFunction->rtt())->asTypeIndex();
if (paramIndex != argIndex) {
throwVMTypeError(globalObject, scope, "Argument function did not match the reference type"_s);
OPERATION_RETURN(scope);
}
}
// Validation only: value not modified so write back not needed.
} else {
// operationConvertToAnyref
value = Wasm::internalizeExternref(value);
if (!Wasm::TypeInformation::isReferenceValueAssignable(value, returnType.isNullable(), returnType.index())) [[unlikely]] {
throwTypeError(globalObject, scope, "Argument value did not match the reference type"_s);
OPERATION_RETURN(scope);
}
*access.operator()<uint64_t>(registerSpace, 0) = std::bit_cast<uint64_t>(value);
}
} else
RELEASE_ASSERT_NOT_REACHED();
}
}
OPERATION_RETURN(scope);
}
unsigned iterationCount = 0;
MarkedArgumentBuffer buffer;
buffer.ensureCapacity(signature.returnCount());
forEachInIterable(globalObject, returned, [&](VM&, JSGlobalObject*, JSValue value) -> void {
if (buffer.size() < signature.returnCount()) {
buffer.append(value);
if (buffer.hasOverflowed()) [[unlikely]]
throwOutOfMemoryError(globalObject, scope);
}
++iterationCount;
});
OPERATION_RETURN_IF_EXCEPTION(scope);
if (buffer.hasOverflowed()) {
throwOutOfMemoryError(globalObject, scope, "JS results to Wasm are too large"_s);
OPERATION_RETURN(scope);
}
if (iterationCount != signature.returnCount()) {
throwVMTypeError(globalObject, scope, "Incorrect number of values returned to Wasm from JS"_s);
OPERATION_RETURN(scope);
}
for (unsigned index = 0; index < buffer.size(); ++index) {
JSValue value = buffer.at(index);
uint64_t unboxedValue = 0;
const auto& returnType = signature.returnType(index);
switch (returnType.kind()) {
case TypeKind::I32:
unboxedValue = static_cast<uint32_t>(value.toInt32(globalObject));
OPERATION_RETURN_IF_EXCEPTION(scope);
break;
case TypeKind::I64:
unboxedValue = value.toBigInt64(globalObject);
OPERATION_RETURN_IF_EXCEPTION(scope);
break;
case TypeKind::F32:
unboxedValue = std::bit_cast<uint32_t>(value.toFloat(globalObject));
OPERATION_RETURN_IF_EXCEPTION(scope);
break;
case TypeKind::F64:
unboxedValue = std::bit_cast<uint64_t>(value.toNumber(globalObject));
OPERATION_RETURN_IF_EXCEPTION(scope);
break;
default: {
if (Wasm::isRefType(returnType)) {
if (value.isNull() && !returnType.isNullable()) [[unlikely]] {
throwTypeError(globalObject, scope, "Host function incorrectly returned null for a nonnullable reference type"_s);
OPERATION_RETURN(scope);
}
if (isExternref(returnType)) {
// Do nothing.
} else if (isFuncref(returnType)) {
WebAssemblyFunction* wasmFunction = nullptr;
WebAssemblyWrapperFunction* wasmWrapperFunction = nullptr;
if (!isWebAssemblyHostFunction(value, wasmFunction, wasmWrapperFunction) && !value.isNull()) [[unlikely]] {
throwTypeError(globalObject, scope, "Argument value did not match the reference type"_s);
OPERATION_RETURN(scope);
}
if (Wasm::isRefWithTypeIndex(returnType) && !value.isNull()) {
Wasm::TypeIndex paramIndex = returnType.index();
Wasm::TypeIndex argIndex = (wasmFunction ? wasmFunction->rtt() : wasmWrapperFunction->rtt())->asTypeIndex();
if (paramIndex != argIndex) {
throwTypeError(globalObject, scope, "Argument value did not match the reference type"_s);
OPERATION_RETURN(scope);
}
}
} else {
value = Wasm::internalizeExternref(value);
if (!Wasm::TypeInformation::isReferenceValueAssignable(value, returnType.isNullable(), returnType.index())) [[unlikely]] {
throwTypeError(globalObject, scope, "Argument value did not match the reference type"_s);
OPERATION_RETURN(scope);
}
}
} else
RELEASE_ASSERT_NOT_REACHED();
unboxedValue = std::bit_cast<uint64_t>(value);
}
}
auto rep = wasmCC.results[index];
if (rep.location.isGPR()) {
auto offset = GPRInfo::toArgumentIndex(rep.location.gpr()) * sizeof(UCPURegister);
*access.operator()<uint64_t>(registerSpace, offset) = unboxedValue;
} else if (rep.location.isFPR()) {
auto offset = GPRInfo::numberOfArgumentRegisters * sizeof(UCPURegister) + FPRInfo::toArgumentIndex(rep.location.fpr()) * bytesForWidth(Width::Width64);
*access.operator()<uint64_t>(registerSpace, offset) = unboxedValue;
} else
*access.operator()<uint64_t>(callFrame, rep.location.offsetFromFP()) = unboxedValue;
}
OPERATION_RETURN(scope);
}
#if ENABLE(WEBASSEMBLY_OMGJIT)
static bool shouldTriggerOMGCompile(TierUpCount& tierUp, OMGCallee* replacement, FunctionCodeIndex functionIndex)
{
if (!OMGPlan::ensureGlobalOMGAllowlist().containsWasmFunction(functionIndex)) {
dataLogLnIf(Options::verboseOSR(), "\tNot optimizing ", functionIndex, " as it's not in the allow list.");
tierUp.deferIndefinitely();
return false;
}
if (!replacement && !tierUp.checkIfOptimizationThresholdReached()) {
dataLogLnIf(Options::verboseOSR(), "\tdelayOMGCompile counter = ", tierUp, " for ", functionIndex);
dataLogLnIf(Options::verboseOSR(), "\tChoosing not to OMG-optimize ", functionIndex, " yet.");
return false;
}
return true;
}
static void triggerOMGReplacementCompile(TierUpCount& tierUp, JSWebAssemblyInstance* instance, Wasm::CalleeGroup& calleeGroup, FunctionCodeIndex functionIndex)
{
MemoryMode memoryMode = instance->memory0Mode();
bool compile = false;
{
Locker locker { tierUp.getLock() };
switch (tierUp.compilationStatusForOMG(memoryMode)) {
case TierUpCount::CompilationStatus::StartCompilation:
tierUp.setOptimizationThresholdBasedOnCompilationResult(functionIndex, CompilationResult::CompilationDeferred);
return;
case TierUpCount::CompilationStatus::NotCompiled:
compile = true;
tierUp.setCompilationStatusForOMG(memoryMode, TierUpCount::CompilationStatus::StartCompilation);
break;
case TierUpCount::CompilationStatus::Compiled:
tierUp.optimizeSoon(functionIndex);
return;
default:
break;
}
}
if (compile) {
dataLogLnIf(Options::verboseOSR(), "\ttriggerOMGReplacement for ", functionIndex);
// We need to compile the code.
Ref<Plan> plan = adoptRef(*new OMGPlan(instance->vm(), Ref<Wasm::Module>(instance->module()), functionIndex, calleeGroup.mode(), Plan::dontFinalize()));
ensureWorklist().enqueue(plan.copyRef());
if (!Options::useConcurrentJIT()) [[unlikely]]
plan->waitForCompletion();
else
tierUp.setOptimizationThresholdBasedOnCompilationResult(functionIndex, CompilationResult::CompilationDeferred);
}
}
// loadValuesIntoBuffer assumes context saved vector-width FPRs.
void loadValuesIntoBuffer(Probe::Context& context, const StackMap& values, Wasm::Context::ScratchBufferEntry* buffer)
{
constexpr bool verbose = false || WasmOperationsInternal::verbose;
dataLogLnIf(verbose, "loadValuesIntoBuffer: values.size() = ", values.size());
for (unsigned index = 0; index < values.size(); ++index) {
const OSREntryValue& value = values[index];
dataLogLnIf(Options::verboseOSR() || verbose, "OMG OSR entry values[", index, "] ", value.type(), " ", value);
if (value.isGPR()) {
switch (value.type().kind()) {
case B3::Float:
case B3::Double:
RELEASE_ASSERT_NOT_REACHED();
default:
*std::bit_cast<uint64_t*>(buffer + index) = context.gpr(value.gpr());
}
dataLogLnIf(verbose, "GPR for value ", index, " ", value.gpr(), " = ", context.gpr(value.gpr()));
} else if (value.isFPR()) {
switch (value.type().kind()) {
case B3::Float:
case B3::Double:
dataLogLnIf(verbose, "FPR for value ", index, " ", value.fpr(), " = ", context.fpr(value.fpr()));
*std::bit_cast<double*>(buffer + index) = context.fpr(value.fpr());
break;
case B3::V128:
#if CPU(X86_64) || CPU(ARM64)
dataLogLnIf(verbose, "Vector FPR for value ", index, " ", value.fpr(), " = ", context.vector(value.fpr()));
*std::bit_cast<v128_t*>(buffer + index) = context.vector(value.fpr());
#else
UNREACHABLE_FOR_PLATFORM();
#endif
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
} else if (value.isConstant()) {
switch (value.type().kind()) {
case B3::Float:
*std::bit_cast<float*>(buffer + index) = value.floatValue();
break;
case B3::Double:
*std::bit_cast<double*>(buffer + index) = value.doubleValue();
break;
case B3::V128:
RELEASE_ASSERT_NOT_REACHED();
break;
default:
*std::bit_cast<uint64_t*>(buffer + index) = value.value();
}
} else if (value.isStack()) {
auto* baseLoad = std::bit_cast<uint8_t*>(context.fp()) + value.offsetFromFP();
auto* baseStore = std::bit_cast<uint8_t*>(buffer + index);
if (value.type().isFloat() || value.type().isVector()) {
dataLogLnIf(verbose, "Stack float or vector for value ", index, " fp offset ", value.offsetFromFP(), " = ",
*std::bit_cast<v128_t*>(baseLoad),
" or double ", *std::bit_cast<double*>(baseLoad));
} else
dataLogLnIf(verbose, "Stack for value ", index, " fp[", value.offsetFromFP(), "] = ", RawHex(*std::bit_cast<uint64_t*>(baseLoad)), " ", static_cast<int32_t>(*std::bit_cast<uint64_t*>(baseLoad)), " ", *std::bit_cast<int64_t*>(baseLoad));
switch (value.type().kind()) {
case B3::Float:
*std::bit_cast<float*>(baseStore) = *std::bit_cast<float*>(baseLoad);
break;
case B3::Double:
*std::bit_cast<double*>(baseStore) = *std::bit_cast<double*>(baseLoad);
break;
case B3::V128:
*std::bit_cast<v128_t*>(baseStore) = *std::bit_cast<v128_t*>(baseLoad);
break;
default:
*std::bit_cast<uint64_t*>(baseStore) = *std::bit_cast<uint64_t*>(baseLoad);
break;
}
} else
RELEASE_ASSERT_NOT_REACHED();
}
}
SUPPRESS_ASAN
static void doOSREntry(JSWebAssemblyInstance* instance, Probe::Context& context, BBQCallee& callee, OMGOSREntryCallee& osrEntryCallee, OSREntryData& osrEntryData)
{
auto returnWithoutOSREntry = [&] {
context.gpr(GPRInfo::nonPreservedNonArgumentGPR0) = 0;
};
RELEASE_ASSERT(osrEntryCallee.osrEntryScratchBufferSize() == osrEntryData.values().size());
auto* buffer = instance->vm().wasmContext.scratchBufferForSize(osrEntryCallee.osrEntryScratchBufferSize());
if (!buffer)
return returnWithoutOSREntry();
dataLogLnIf(Options::verboseOSR(), callee, ": OMG OSR entry: functionCodeIndex=", osrEntryData.functionIndex(), " got entry callee ", RawPointer(&osrEntryCallee));
// 1. Place required values in scratch buffer.
loadValuesIntoBuffer(context, osrEntryData.values(), buffer);
// 2. Restore callee saves.
auto dontRestoreRegisters = RegisterSet::stackRegisters();
for (const RegisterAtOffset& entry : *callee.calleeSaveRegisters()) {
if (dontRestoreRegisters.contains(entry.reg(), IgnoreVectors))
continue;
if (entry.reg().isGPR())
context.gpr(entry.reg().gpr()) = *std::bit_cast<UCPURegister*>(std::bit_cast<uint8_t*>(context.fp()) + entry.offset());
else
context.fpr(entry.reg().fpr()) = *std::bit_cast<double*>(std::bit_cast<uint8_t*>(context.fp()) + entry.offset());
}
// 3. Function epilogue, like a tail-call.
UCPURegister* framePointer = std::bit_cast<UCPURegister*>(context.fp());
#if CPU(X86_64)
// move(framePointerRegister, stackPointerRegister);
// pop(framePointerRegister);
context.fp() = std::bit_cast<UCPURegister*>(*framePointer);
context.sp() = framePointer + 1;
static_assert(prologueStackPointerDelta() == sizeof(void*) * 1);
#elif CPU(ARM64E) || CPU(ARM64)
// move(framePointerRegister, stackPointerRegister);
// popPair(framePointerRegister, linkRegister);
context.fp() = std::bit_cast<UCPURegister*>(*framePointer);
context.gpr(ARM64Registers::lr) = std::bit_cast<UCPURegister>(*(framePointer + 1));
context.sp() = framePointer + 2;
static_assert(prologueStackPointerDelta() == sizeof(void*) * 2);
#if CPU(ARM64E)
// LR needs to be untagged since OSR entry function prologue will tag it with SP. This is similar to tail-call.
context.gpr(ARM64Registers::lr) = std::bit_cast<UCPURegister>(untagCodePtrWithStackPointerForJITCall(context.gpr<void*>(ARM64Registers::lr), context.sp()));
#endif
#elif CPU(RISCV64)
// move(framePointerRegister, stackPointerRegister);
// popPair(framePointerRegister, linkRegister);
context.fp() = std::bit_cast<UCPURegister*>(*framePointer);
context.gpr(RISCV64Registers::ra) = std::bit_cast<UCPURegister>(*(framePointer + 1));
context.sp() = framePointer + 2;
static_assert(prologueStackPointerDelta() == sizeof(void*) * 2);
#else
#error Unsupported architecture.
#endif
// 4. Configure argument registers to jump to OSR entry from the caller of this runtime function.
context.gpr(GPRInfo::argumentGPR0) = std::bit_cast<UCPURegister>(buffer); // Modify this only when we definitely tier up.
context.gpr(GPRInfo::nonPreservedNonArgumentGPR0) = std::bit_cast<UCPURegister>(osrEntryCallee.entrypoint().taggedPtr<>());
}
inline bool shouldOMGJIT(JSWebAssemblyInstance* instance, unsigned functionIndex)
{
auto& info = instance->module().moduleInformation();
if (info.functions[functionIndex].data.size() > Options::maximumOMGCandidateCost())
return false;
if (!Options::wasmFunctionIndexRangeToCompile().isInRange(functionIndex))
return false;
return true;
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationWasmTriggerTierUpNow, void, (CallFrame* callFrame, JSWebAssemblyInstance* instance))
{
BBQCallee& callee = uncheckedDowncast<BBQCallee>(uncheckedDowncast<Wasm::Callee>(*callFrame->callee().asNativeCallee()));
ASSERT(callee.compilationMode() == CompilationMode::BBQMode);
Wasm::CalleeGroup& calleeGroup = *instance->calleeGroup();
ASSERT(instance->memory0Mode() == calleeGroup.mode());
FunctionSpaceIndex functionIndexInSpace = callee.index();
FunctionCodeIndex functionIndex = calleeGroup.toCodeIndex(functionIndexInSpace);
TierUpCount& tierUp = callee.tierUpCounter();
if (!shouldOMGJIT(instance, functionIndex)) {
tierUp.deferIndefinitely();
return;
}
if (shouldTriggerOMGCompile(tierUp, nullptr, functionIndex))
triggerOMGReplacementCompile(tierUp, instance, calleeGroup, functionIndex);
}
#endif
#if ENABLE(WEBASSEMBLY_OMGJIT)
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationWasmTriggerOSREntryNow, void, (Probe::Context& context))
{
OSREntryData& osrEntryData = *context.arg<OSREntryData*>();
auto functionIndex = osrEntryData.functionIndex();
uint32_t loopIndex = osrEntryData.loopIndex();
JSWebAssemblyInstance* instance = context.gpr<JSWebAssemblyInstance*>(GPRInfo::wasmContextInstancePointer);
BBQCallee& callee = uncheckedDowncast<BBQCallee>(uncheckedDowncast<Wasm::Callee>(*context.gpr<CallFrame*>(MacroAssembler::framePointerRegister)->callee().asNativeCallee()));
ASSERT(callee.compilationMode() == Wasm::CompilationMode::BBQMode);
ASSERT(callee.refCount());
Wasm::CalleeGroup& calleeGroup = *instance->calleeGroup();
auto returnWithoutOSREntry = [&] {
context.gpr(GPRInfo::nonPreservedNonArgumentGPR0) = 0;
};
auto doStackCheck = [instance](OMGOSREntryCallee* callee) -> bool {
uintptr_t stackPointer = reinterpret_cast<uintptr_t>(currentStackPointer());
ASSERT(callee->stackCheckSize());
if (callee->stackCheckSize() == stackCheckNotNeeded)
return true;
uintptr_t stackExtent = stackPointer - callee->stackCheckSize();
uintptr_t stackLimit = reinterpret_cast<uintptr_t>(instance->softStackLimit());
if (stackExtent >= stackPointer || stackExtent <= stackLimit) [[unlikely]] {
dataLogLnIf(Options::verboseOSR(), "\tSkipping OMG loop tier up due to stack check; ", RawHex(stackPointer), " -> ", RawHex(stackExtent), " is past soft limit ", RawHex(stackLimit));
return false;
}
return true;
};
MemoryMode memoryMode = instance->memory0Mode();
ASSERT(memoryMode == calleeGroup.mode());
TierUpCount& tierUp = callee.tierUpCounter();
if (!shouldOMGJIT(instance, functionIndex)) {
tierUp.deferIndefinitely();
return returnWithoutOSREntry();
}
RefPtr<OMGCallee> replacement = calleeGroup.tryGetOMGCalleeConcurrently(functionIndex);
dataLogLnIf(Options::verboseOSR(), callee, ": Consider OSREntryPlan for functionCodeIndex=", osrEntryData.functionIndex(), " loopIndex#", loopIndex, " with executeCounter = ", tierUp, " ", RawPointer(replacement.get()));
if (!Options::useWasmOSR()) {
if (shouldTriggerOMGCompile(tierUp, replacement.get(), functionIndex))
triggerOMGReplacementCompile(tierUp, instance, calleeGroup, functionIndex);
// We already have an OMG replacement.
if (replacement) {
// No OSR entry points. Just defer indefinitely.
if (tierUp.osrEntryTriggers().isEmpty()) {
tierUp.dontOptimizeAnytimeSoon(functionIndex);
return;
}
// FIXME: Is this ever taken?
// Found one OSR entry point. Since we do not have a way to jettison Wasm::Callee right now, this means that tierUp function is now meaningless.
// Not call it as much as possible.
if (callee.osrEntryCallee()) {
tierUp.dontOptimizeAnytimeSoon(functionIndex);
return;
}
}
return returnWithoutOSREntry();
}
TierUpCount::CompilationStatus compilationStatus = TierUpCount::CompilationStatus::NotCompiled;
{
Locker locker { tierUp.getLock() };
compilationStatus = tierUp.compilationStatusForOMGForOSREntry(memoryMode);
}
bool triggeredSlowPathToStartCompilation = false;
switch (tierUp.osrEntryTriggers()[loopIndex]) {
case TierUpCount::TriggerReason::DontTrigger:
// The trigger isn't set, we entered because the counter reached its
// threshold.
break;
case TierUpCount::TriggerReason::CompilationDone:
// The trigger was set because compilation completed. Don't unset it
// so that further BBQ executions OSR enter as well.
break;
case TierUpCount::TriggerReason::StartCompilation: {
// We were asked to enter as soon as possible and start compiling an
// entry for the current loopIndex. Unset this trigger so we
// don't continually enter.
Locker locker { tierUp.getLock() };
TierUpCount::TriggerReason reason = tierUp.osrEntryTriggers()[loopIndex];
if (reason == TierUpCount::TriggerReason::StartCompilation) {
tierUp.osrEntryTriggers()[loopIndex] = TierUpCount::TriggerReason::DontTrigger;
triggeredSlowPathToStartCompilation = true;
}
break;
}
}
if (compilationStatus == TierUpCount::CompilationStatus::StartCompilation) {
dataLogLnIf(Options::verboseOSR(), "\tdelayOMGCompile still compiling for ", functionIndex);
tierUp.setOptimizationThresholdBasedOnCompilationResult(functionIndex, CompilationResult::CompilationDeferred);
return returnWithoutOSREntry();
}
if (OMGOSREntryCallee* osrEntryCallee = callee.osrEntryCallee()) {
if (osrEntryCallee->loopIndex() == loopIndex) {
if (!doStackCheck(osrEntryCallee))
return returnWithoutOSREntry();
return doOSREntry(instance, context, callee, *osrEntryCallee, osrEntryData);
}
}