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/*
* Copyright (C) 2016-2024 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 "JSToWasm.h"
#include "WasmCallee.h"
#include <wtf/Gigacage.h>
#include <wtf/WTFConfig.h>
#if ENABLE(WEBASSEMBLY) && ENABLE(JIT)
#include "CCallHelpers.h"
#include "JSCJSValueInlines.h"
#include "JSWebAssemblyInstance.h"
#include "MaxFrameExtentForSlowPathCall.h"
#include "WasmCallingConvention.h"
#include "WasmContext.h"
#include "WasmOperations.h"
#include "WasmThunks.h"
#include "WasmToJS.h"
#include "WebAssemblyFunctionBase.h"
namespace JSC {
namespace Wasm {
static void marshallJSResult(CCallHelpers& jit, const FunctionSignature& signature, const CallInformation& wasmFrameConvention, const RegisterAtOffsetList& savedResultRegisters, CCallHelpers::JumpList& exceptionChecks)
{
auto boxNativeCalleeResult = [](CCallHelpers& jit, Type type, ValueLocation src, JSValueRegs dst) {
JIT_COMMENT(jit, "boxNativeCalleeResult ", type);
switch (type.kind) {
case TypeKind::Void:
jit.moveTrustedValue(jsUndefined(), dst);
break;
case TypeKind::I32:
jit.zeroExtend32ToWord(src.jsr().payloadGPR(), dst.payloadGPR());
jit.boxInt32(dst.payloadGPR(), dst, DoNotHaveTagRegisters);
break;
case TypeKind::F32:
jit.convertFloatToDouble(src.fpr(), src.fpr());
FALLTHROUGH;
case TypeKind::F64: {
jit.moveTrustedValue(jsNumber(PNaN), dst);
auto isNaN = jit.branchIfNaN(src.fpr());
#if USE(JSVALUE64)
jit.boxDouble(src.fpr(), dst, DoNotHaveTagRegisters);
#else
jit.boxDouble(src.fpr(), dst);
#endif
isNaN.link(&jit);
break;
}
default: {
if (isRefType(type))
jit.moveValueRegs(src.jsr(), dst);
else
jit.breakpoint();
}
}
};
if (signature.returnsVoid())
jit.moveTrustedValue(jsUndefined(), JSRInfo::returnValueJSR);
else if (signature.returnCount() == 1) {
if (signature.returnType(0).isI64()) {
JIT_COMMENT(jit, "convert wasm return to big int");
JSValueRegs inputJSR = wasmFrameConvention.results[0].location.jsr();
jit.prepareWasmCallOperation(GPRInfo::wasmContextInstancePointer);
jit.setupArguments<decltype(operationConvertToBigInt)>(GPRInfo::wasmContextInstancePointer, inputJSR);
jit.callOperation<OperationPtrTag>(operationConvertToBigInt);
} else
boxNativeCalleeResult(jit, signature.returnType(0), wasmFrameConvention.results[0].location, JSRInfo::returnValueJSR);
} else {
IndexingType indexingType = ArrayWithUndecided;
JSValueRegs scratchJSR = JSValueRegs {
#if USE(JSVALUE32_64)
wasmCallingConvention().prologueScratchGPRs[2],
#endif
wasmCallingConvention().prologueScratchGPRs[1]
};
ASSERT(scratchJSR.payloadGPR() != GPRReg::InvalidGPRReg);
#if USE(JSVALUE32_64)
ASSERT(scratchJSR.tagGPR() != GPRReg::InvalidGPRReg);
ASSERT(scratchJSR.payloadGPR() != scratchJSR.tagGPR());
#endif
// We can use the first floating point register as a scratch since it will always be moved onto the stack before other values.
FPRReg fprScratch = wasmCallingConvention().fprArgs[0];
JIT_COMMENT(jit, "scratchFPR: ", fprScratch, " - Scratch jsr: ", scratchJSR, " - saved result registers: ", savedResultRegisters);
bool hasI64 = false;
for (unsigned i = 0; i < signature.returnCount(); ++i) {
ValueLocation loc = wasmFrameConvention.results[i].location;
Type type = signature.returnType(i);
hasI64 |= type.isI64();
if (loc.isGPR() || loc.isFPR()) {
#if USE(JSVALUE32_64)
ASSERT(!loc.isGPR() || savedResultRegisters.find(loc.jsr().payloadGPR())->offset() + 4 == savedResultRegisters.find(loc.jsr().tagGPR())->offset());
#endif
auto address = CCallHelpers::Address(CCallHelpers::stackPointerRegister, wasmFrameConvention.headerAndArgumentStackSizeInBytes);
switch (type.kind) {
case TypeKind::F32:
case TypeKind::F64:
boxNativeCalleeResult(jit, type, loc, scratchJSR);
jit.storeValue(scratchJSR, address.withOffset(savedResultRegisters.find(loc.fpr())->offset()));
break;
case TypeKind::I64:
jit.storeValue(loc.jsr(), address.withOffset(savedResultRegisters.find(loc.jsr().payloadGPR())->offset()));
break;
default:
boxNativeCalleeResult(jit, type, loc, scratchJSR);
jit.storeValue(scratchJSR, address.withOffset(savedResultRegisters.find(loc.jsr().payloadGPR())->offset()));
break;
}
} else {
if (!type.isI64()) {
auto location = CCallHelpers::Address(CCallHelpers::stackPointerRegister, loc.offsetFromSP());
ValueLocation tmp;
switch (type.kind) {
case TypeKind::F32:
tmp = ValueLocation { fprScratch };
jit.loadFloat(location, fprScratch);
break;
case TypeKind::F64:
tmp = ValueLocation { fprScratch };
jit.loadDouble(location, fprScratch);
break;
case TypeKind::I32:
tmp = ValueLocation { scratchJSR };
jit.load32(location, scratchJSR.payloadGPR());
break;
default:
tmp = ValueLocation { scratchJSR };
jit.loadValue(location, scratchJSR);
break;
}
boxNativeCalleeResult(jit, type, tmp, scratchJSR);
jit.storeValue(scratchJSR, location);
}
}
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;
}
}
// Now, all return values are stored in memory. So we can call functions can clobber caller-save registers.
// This is required to convert values to BigInt.
if (hasI64) {
for (unsigned i = 0; i < signature.returnCount(); ++i) {
ValueLocation loc = wasmFrameConvention.results[i].location;
Type type = signature.returnType(i);
if (!type.isI64())
continue;
constexpr JSValueRegs valueJSR = preferredArgumentJSR<decltype(operationConvertToBigInt), 1>();
CCallHelpers::Address address { CCallHelpers::stackPointerRegister };
if (loc.isGPR() || loc.isFPR()) {
#if USE(JSVALUE32_64)
ASSERT(savedResultRegisters.find(loc.jsr().payloadGPR())->offset() + 4 == savedResultRegisters.find(loc.jsr().tagGPR())->offset());
#endif
address = address.withOffset(savedResultRegisters.find(loc.jsr().payloadGPR())->offset() + wasmFrameConvention.headerAndArgumentStackSizeInBytes);
} else
address = address.withOffset(loc.offsetFromSP());
jit.loadValue(address, valueJSR);
jit.prepareWasmCallOperation(GPRInfo::wasmContextInstancePointer);
jit.setupArguments<decltype(operationConvertToBigInt)>(GPRInfo::wasmContextInstancePointer, valueJSR);
jit.callOperation<OperationPtrTag>(operationConvertToBigInt);
jit.storeValue(JSRInfo::returnValueJSR, address);
}
}
constexpr GPRReg savedResultsGPR = preferredArgumentGPR<decltype(operationAllocateResultsArray), 3>();
jit.move(CCallHelpers::stackPointerRegister, savedResultsGPR);
if constexpr (!!maxFrameExtentForSlowPathCall)
jit.subPtr(CCallHelpers::TrustedImm32(maxFrameExtentForSlowPathCall), CCallHelpers::stackPointerRegister);
static_assert(GPRInfo::wasmContextInstancePointer != savedResultsGPR);
jit.prepareWasmCallOperation(GPRInfo::wasmContextInstancePointer);
jit.setupArguments<decltype(operationAllocateResultsArray)>(GPRInfo::wasmContextInstancePointer, CCallHelpers::TrustedImmPtr(&signature), indexingType, savedResultsGPR);
JIT_COMMENT(jit, "operationAllocateResultsArray");
jit.callOperation<OperationPtrTag>(operationAllocateResultsArray);
static_assert(CCallHelpers::operationExceptionRegister<operationAllocateResultsArray>() != InvalidGPRReg, "We don't have a VM readily available so we rely on exception being returned");
exceptionChecks.append(jit.branchTestPtr(CCallHelpers::NonZero, CCallHelpers::operationExceptionRegister<operationAllocateResultsArray>()));
if constexpr (!!maxFrameExtentForSlowPathCall)
jit.addPtr(CCallHelpers::TrustedImm32(maxFrameExtentForSlowPathCall), CCallHelpers::stackPointerRegister);
jit.boxCell(GPRInfo::returnValueGPR, JSRInfo::returnValueJSR);
}
}
MacroAssemblerCodeRef<JITThunkPtrTag> createJSToWasmJITShared()
{
static LazyNeverDestroyed<MacroAssemblerCodeRef<JITThunkPtrTag>> codeRef;
static std::once_flag onceKey;
std::call_once(onceKey, [&] {
// JIT version of js_to_wasm_wrapper_entry
// If you change this, make sure to modify WebAssembly.asm:op(js_to_wasm_wrapper_entry)
CCallHelpers jit;
CCallHelpers::JumpList exceptionChecks;
CCallHelpers::JumpList stackOverflow;
CCallHelpers::JumpList buildEntryFrameThrew;
auto calleeSaves = Wasm::JSEntrypointCallee::calleeSaveRegistersImpl();
jit.emitFunctionPrologue();
jit.subPtr(CCallHelpers::TrustedImmPtr(Wasm::JSEntrypointCallee::SpillStackSpaceAligned), CCallHelpers::stackPointerRegister);
jit.emitSaveCalleeSavesFor(calleeSaves);
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::regWS0);
jit.loadPtr(CCallHelpers::Address(GPRInfo::regWS0, WebAssemblyFunction::offsetOfInstance()), GPRInfo::wasmContextInstancePointer);
// Now, the current frame is fully set up for exceptions.
// Allocate stack space
JIT_COMMENT(jit, "stack overflow check");
jit.load32(CCallHelpers::Address(GPRInfo::regWS0, WebAssemblyFunction::offsetOfFrameSize()), GPRInfo::regWS1);
jit.subPtr(CCallHelpers::stackPointerRegister, GPRInfo::regWS1, GPRInfo::regWS1);
#if !CPU(ADDRESS64)
stackOverflow.append(jit.branchPtr(CCallHelpers::Above, GPRInfo::regWS1, GPRInfo::callFrameRegister));
#endif
stackOverflow.append(jit.branchPtr(CCallHelpers::LessThanOrEqual, GPRInfo::regWS1, CCallHelpers::Address(GPRInfo::wasmContextInstancePointer, JSWebAssemblyInstance::offsetOfSoftStackLimit())));
jit.move(GPRInfo::regWS1, CCallHelpers::stackPointerRegister);
jit.move(CCallHelpers::stackPointerRegister, GPRInfo::argumentGPR0);
jit.storePtr(GPRInfo::wasmContextInstancePointer, CCallHelpers::addressFor(CallFrameSlot::codeBlock));
// Save the current Callee before putting in our boxed callee for the stack visitor
#if USE(JSVALUE64)
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::wasmBaseMemoryPointer);
jit.transferPtr(CCallHelpers::Address(GPRInfo::regWS0, WebAssemblyFunction::offsetOfBoxedJSToWasmCallee()), CCallHelpers::addressFor(CallFrameSlot::callee));
#else
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::regWS1);
jit.push(GPRInfo::regWS1);
jit.push(GPRInfo::regWS1);
jit.transferPtr(CCallHelpers::Address(GPRInfo::regWS0, WebAssemblyFunction::offsetOfBoxedJSToWasmCallee()), CCallHelpers::addressFor(CallFrameSlot::callee));
#endif
// Prepare frame
jit.setupArguments<decltype(operationJSToWasmEntryWrapperBuildFrame)>(GPRInfo::argumentGPR0, GPRInfo::callFrameRegister, GPRInfo::regWS0);
jit.callOperation<OperationPtrTag>(operationJSToWasmEntryWrapperBuildFrame);
// Restore Callee slot regardless
#if USE(JSVALUE64)
jit.storePtr(GPRInfo::wasmBaseMemoryPointer, CCallHelpers::addressFor(CallFrameSlot::callee));
#else
jit.transferPtr(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 0), CCallHelpers::addressFor(CallFrameSlot::callee));
jit.addPtr(CCallHelpers::TrustedImm32(2 * 8), CCallHelpers::stackPointerRegister);
#endif
static_assert(CCallHelpers::operationExceptionRegister<operationJSToWasmEntryWrapperBuildFrame>() != InvalidGPRReg, "We don't have a VM readily available so we rely on exception being returned");
JIT_COMMENT(jit, "Exception check: ", CCallHelpers::operationExceptionRegister<operationJSToWasmEntryWrapperBuildFrame>());
buildEntryFrameThrew.append(jit.branchTestPtr(CCallHelpers::NonZero, CCallHelpers::operationExceptionRegister<operationJSToWasmEntryWrapperBuildFrame>()));
jit.move(GPRInfo::returnValueGPR, GPRInfo::regWS0);
// Memory
#if USE(JSVALUE64)
jit.loadPair64(GPRInfo::wasmContextInstancePointer, CCallHelpers::TrustedImm32(JSWebAssemblyInstance::offsetOfCachedMemory()), GPRInfo::wasmBaseMemoryPointer, GPRInfo::wasmBoundsCheckingSizeRegister);
jit.cageConditionally(Gigacage::Primitive, GPRInfo::wasmBaseMemoryPointer, GPRInfo::wasmBoundsCheckingSizeRegister, GPRInfo::regWA0);
#endif
#if CPU(ARM64)
jit.loadPair64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 0 * 8), GPRInfo::regWA0, GPRInfo::regWA1);
jit.loadPair64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 2 * 8), GPRInfo::regWA2, GPRInfo::regWA3);
jit.loadPair64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 4 * 8), GPRInfo::regWA4, GPRInfo::regWA5);
jit.loadPair64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 6 * 8), GPRInfo::regWA6, GPRInfo::regWA7);
#elif CPU(X86_64)
jit.loadPair64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 0 * 8), GPRInfo::regWA0, GPRInfo::regWA1);
jit.loadPair64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 2 * 8), GPRInfo::regWA2, GPRInfo::regWA3);
jit.loadPair64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 4 * 8), GPRInfo::regWA4, GPRInfo::regWA5);
#elif USE(JSVALUE64)
jit.load64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 0 * 8), GPRInfo::regWA0);
jit.load64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 1 * 8), GPRInfo::regWA1);
jit.load64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 2 * 8), GPRInfo::regWA2);
jit.load64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 3 * 8), GPRInfo::regWA3);
jit.load64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 4 * 8), GPRInfo::regWA4);
jit.load64(CCallHelpers::Address(CCallHelpers::stackPointerRegister, 5 * 8), GPRInfo::regWA5);
#else
jit.loadPair32(CCallHelpers::stackPointerRegister, CCallHelpers::TrustedImm32(0 * 8), GPRInfo::regWA0, GPRInfo::regWA1);
jit.loadPair32(CCallHelpers::stackPointerRegister, CCallHelpers::TrustedImm32(1 * 8), GPRInfo::regWA2, GPRInfo::regWA3);
#endif
#if CPU(ARM64)
jit.loadPairDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 0) * 8), FPRInfo::argumentFPR0, FPRInfo::argumentFPR1);
jit.loadPairDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 2) * 8), FPRInfo::argumentFPR2, FPRInfo::argumentFPR3);
jit.loadPairDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 4) * 8), FPRInfo::argumentFPR4, FPRInfo::argumentFPR5);
jit.loadPairDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 6) * 8), FPRInfo::argumentFPR6, FPRInfo::argumentFPR7);
#elif CPU(X86_64) || CPU(RISCV64)
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 0) * 8), FPRInfo::argumentFPR0);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 1) * 8), FPRInfo::argumentFPR1);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 2) * 8), FPRInfo::argumentFPR2);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 3) * 8), FPRInfo::argumentFPR3);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 4) * 8), FPRInfo::argumentFPR4);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 5) * 8), FPRInfo::argumentFPR5);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 6) * 8), FPRInfo::argumentFPR6);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 7) * 8), FPRInfo::argumentFPR7);
#elif CPU(ARM_THUMB2)
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 0 * 8), FPRInfo::argumentFPR0);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 1 * 8), FPRInfo::argumentFPR1);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 2 * 8), FPRInfo::argumentFPR2);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 3 * 8), FPRInfo::argumentFPR3);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 4 * 8), FPRInfo::argumentFPR4);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 5 * 8), FPRInfo::argumentFPR5);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 6 * 8), FPRInfo::argumentFPR6);
jit.loadDouble(CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 7 * 8), FPRInfo::argumentFPR7);
#endif
// Pop argument space values
jit.addPtr(CCallHelpers::TrustedImmPtr(Wasm::JSEntrypointCallee::RegisterStackSpaceAligned), CCallHelpers::stackPointerRegister);
#if ASSERT_ENABLED
for (int32_t i = 0; i < 30; ++i)
jit.storePtr(CCallHelpers::TrustedImmPtr(0xbeef), CCallHelpers::Address(CCallHelpers::stackPointerRegister, -i * static_cast<int32_t>(sizeof(Register))));
#endif
JIT_COMMENT(jit, "Re-load WebAssemblyFunction Callee");
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::regWS1);
JIT_COMMENT(jit, "Replace the WebAssemblyFunction Callee with our JSToWasm NativeCallee");
jit.transferPtr(CCallHelpers::Address(GPRInfo::regWS1, WebAssemblyFunction::offsetOfBoxedJSToWasmCallee()), CCallHelpers::addressFor(CallFrameSlot::callee));
if constexpr (is32Bit())
jit.store32(CCallHelpers::TrustedImm32(JSValue::NativeCalleeTag), CCallHelpers::tagFor(CallFrameSlot::callee));
jit.storePtr(GPRInfo::wasmContextInstancePointer, CCallHelpers::addressFor(CallFrameSlot::codeBlock));
// FIXME: We could load the entrypoint much earlier on ARM64 since we have a ton of scratch registers and already have callee in a register. Maybe that's profitable?
JIT_COMMENT(jit, "Load callee entrypoint");
jit.loadPtr(MacroAssembler::Address(GPRInfo::regWS1, WebAssemblyFunction::offsetOfEntrypointLoadLocation()), GPRInfo::regWS0);
jit.loadPtr(MacroAssembler::Address(GPRInfo::regWS0), GPRInfo::regWS0);
// Store the new callee Callee[cfr]
JIT_COMMENT(jit, "Set the callee's interpreter Wasm::Callee");
#if USE(JSVALUE64)
jit.transferPtr(CCallHelpers::Address(GPRInfo::regWS1, WebAssemblyFunction::offsetOfBoxedWasmCallee()), CCallHelpers::calleeFrameSlot(CallFrameSlot::callee));
#else
jit.transferPtr(CCallHelpers::Address(GPRInfo::regWS1, WebAssemblyFunction::offsetOfBoxedWasmCallee() + PayloadOffset), CCallHelpers::calleeFramePayloadSlot(CallFrameSlot::callee));
jit.transferPtr(CCallHelpers::Address(GPRInfo::regWS1, WebAssemblyFunction::offsetOfBoxedWasmCallee() + TagOffset), CCallHelpers::calleeFrameTagSlot(CallFrameSlot::callee));
#endif
jit.call(GPRInfo::regWS0, WasmEntryPtrTag);
// Restore SP
// Callee[cfr]
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::regWS0);
jit.unboxNativeCallee(GPRInfo::regWS0, GPRInfo::regWS0);
jit.load32(CCallHelpers::Address(GPRInfo::regWS0, JSEntrypointCallee::offsetOfFrameSize()), GPRInfo::regWS1);
jit.addPtr(CCallHelpers::TrustedImmPtr(JSEntrypointCallee::SpillStackSpaceAligned), GPRInfo::regWS1);
#if CPU(ARM_THUMB2)
jit.subPtr(GPRInfo::callFrameRegister, GPRInfo::regWS1, GPRInfo::regWS1);
jit.move(GPRInfo::regWS1, CCallHelpers::stackPointerRegister);
#else
jit.subPtr(GPRInfo::callFrameRegister, GPRInfo::regWS1, CCallHelpers::stackPointerRegister);
#endif
// Save return registers
#if CPU(ARM64)
jit.storePair64(GPRInfo::regWA0, GPRInfo::regWA1, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 0 * 8));
jit.storePair64(GPRInfo::regWA2, GPRInfo::regWA3, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 2 * 8));
jit.storePair64(GPRInfo::regWA4, GPRInfo::regWA5, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 4 * 8));
jit.storePair64(GPRInfo::regWA6, GPRInfo::regWA7, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 6 * 8));
#elif CPU(X86_64)
jit.storePair64(GPRInfo::regWA0, GPRInfo::regWA1, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 0 * 8));
jit.storePair64(GPRInfo::regWA2, GPRInfo::regWA3, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 2 * 8));
jit.storePair64(GPRInfo::regWA4, GPRInfo::regWA5, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 4 * 8));
#elif USE(JSVALUE64)
jit.store64(GPRInfo::regWA0, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 0 * 8));
jit.store64(GPRInfo::regWA1, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 1 * 8));
jit.store64(GPRInfo::regWA2, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 2 * 8));
jit.store64(GPRInfo::regWA3, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 3 * 8));
jit.store64(GPRInfo::regWA4, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 4 * 8));
jit.store64(GPRInfo::regWA5, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 5 * 8));
#else
jit.storePair32(GPRInfo::regWA0, GPRInfo::regWA1, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 0 * 8));
jit.storePair32(GPRInfo::regWA2, GPRInfo::regWA3, CCallHelpers::Address(CCallHelpers::stackPointerRegister, 1 * 8));
#endif
#if CPU(ARM64)
jit.storePairDouble(FPRInfo::argumentFPR0, FPRInfo::argumentFPR1, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 0) * 8));
jit.storePairDouble(FPRInfo::argumentFPR2, FPRInfo::argumentFPR3, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 2) * 8));
jit.storePairDouble(FPRInfo::argumentFPR4, FPRInfo::argumentFPR5, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 4) * 8));
jit.storePairDouble(FPRInfo::argumentFPR6, FPRInfo::argumentFPR7, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 6) * 8));
#elif CPU(X86_64) || CPU(RISCV64)
jit.storeDouble(FPRInfo::argumentFPR0, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 0) * 8));
jit.storeDouble(FPRInfo::argumentFPR1, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 1) * 8));
jit.storeDouble(FPRInfo::argumentFPR2, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 2) * 8));
jit.storeDouble(FPRInfo::argumentFPR3, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 3) * 8));
jit.storeDouble(FPRInfo::argumentFPR4, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 4) * 8));
jit.storeDouble(FPRInfo::argumentFPR5, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 5) * 8));
jit.storeDouble(FPRInfo::argumentFPR6, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 6) * 8));
jit.storeDouble(FPRInfo::argumentFPR7, CCallHelpers::Address(CCallHelpers::stackPointerRegister, (GPRInfo::numberOfArgumentRegisters + 7) * 8));
#elif CPU(ARM_THUMB2)
jit.storeDouble(FPRInfo::argumentFPR0, CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 0 * 8));
jit.storeDouble(FPRInfo::argumentFPR1, CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 1 * 8));
jit.storeDouble(FPRInfo::argumentFPR2, CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 2 * 8));
jit.storeDouble(FPRInfo::argumentFPR3, CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 3 * 8));
jit.storeDouble(FPRInfo::argumentFPR4, CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 4 * 8));
jit.storeDouble(FPRInfo::argumentFPR5, CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 5 * 8));
jit.storeDouble(FPRInfo::argumentFPR6, CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 6 * 8));
jit.storeDouble(FPRInfo::argumentFPR7, CCallHelpers::Address(CCallHelpers::stackPointerRegister, GPRInfo::numberOfArgumentRegisters * 4 + 7 * 8));
#endif
// Prepare frame
jit.setupArguments<decltype(operationJSToWasmEntryWrapperBuildReturnFrame)>(CCallHelpers::stackPointerRegister, GPRInfo::callFrameRegister);
jit.callOperation<OperationPtrTag>(operationJSToWasmEntryWrapperBuildReturnFrame);
#if USE(JSVALUE64)
static_assert(CCallHelpers::operationExceptionRegister<operationJSToWasmEntryWrapperBuildReturnFrame>() != InvalidGPRReg, "We don't have a VM readily available so we rely on exception being returned");
JIT_COMMENT(jit, "Exception check: ", CCallHelpers::operationExceptionRegister<operationJSToWasmEntryWrapperBuildReturnFrame>());
exceptionChecks.append(jit.branchTestPtr(CCallHelpers::NonZero, CCallHelpers::operationExceptionRegister<operationJSToWasmEntryWrapperBuildReturnFrame>()));
#else
static_assert(CCallHelpers::operationExceptionRegister<operationJSToWasmEntryWrapperBuildReturnFrame>() == InvalidGPRReg);
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::codeBlock), GPRInfo::regWA2);
jit.loadPtr(CCallHelpers::Address(GPRInfo::regWA2, JSWebAssemblyInstance::offsetOfVM()), GPRInfo::regWA2);
exceptionChecks.append(jit.branchTestPtr(CCallHelpers::NonZero, CCallHelpers::Address(GPRInfo::regWA2, VM::exceptionOffset())));
#endif
jit.emitRestoreCalleeSavesFor(calleeSaves);
jit.addPtr(CCallHelpers::TrustedImmPtr(Wasm::JSEntrypointCallee::SpillStackSpaceAligned), CCallHelpers::stackPointerRegister);
jit.emitFunctionEpilogue();
jit.ret();
stackOverflow.link(&jit);
{
JIT_COMMENT(jit, "Re-load WebAssemblyFunction Callee");
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::regWS1);
JIT_COMMENT(jit, "Replace the WebAssemblyFunction Callee with our JSToWasm NativeCallee");
jit.transferPtr(CCallHelpers::Address(GPRInfo::regWS1, WebAssemblyFunction::offsetOfBoxedJSToWasmCallee()), CCallHelpers::addressFor(CallFrameSlot::callee));
if constexpr (is32Bit())
jit.store32(CCallHelpers::TrustedImm32(JSValue::NativeCalleeTag), CCallHelpers::tagFor(CallFrameSlot::callee));
jit.storePtr(GPRInfo::wasmContextInstancePointer, CCallHelpers::addressFor(CallFrameSlot::codeBlock));
jit.jumpThunk(CodeLocationLabel<JITThunkPtrTag>(Thunks::singleton().stub(throwStackOverflowFromWasmThunkGenerator).code()));
}
buildEntryFrameThrew.link(&jit);
JIT_COMMENT(jit, "Re-load WebAssemblyFunction Callee");
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::regWS1);
JIT_COMMENT(jit, "Replace the WebAssemblyFunction Callee with our JSToWasm NativeCallee");
jit.transferPtr(CCallHelpers::Address(GPRInfo::regWS1, WebAssemblyFunction::offsetOfBoxedJSToWasmCallee()), CCallHelpers::addressFor(CallFrameSlot::callee));
if constexpr (is32Bit())
jit.store32(CCallHelpers::TrustedImm32(JSValue::NativeCalleeTag), CCallHelpers::tagFor(CallFrameSlot::callee));
jit.storePtr(GPRInfo::wasmContextInstancePointer, CCallHelpers::addressFor(CallFrameSlot::codeBlock));
exceptionChecks.link(&jit);
jit.move(GPRInfo::wasmContextInstancePointer, GPRInfo::argumentGPR0);
jit.loadPtr(CCallHelpers::Address(GPRInfo::wasmContextInstancePointer, JSWebAssemblyInstance::offsetOfVM()), GPRInfo::argumentGPR1);
jit.emitRestoreCalleeSavesFor(calleeSaves);
jit.copyCalleeSavesToVMEntryFrameCalleeSavesBuffer(GPRInfo::argumentGPR1);
// These are mostly no-ops but we leave them here for bookkeeping.
jit.prepareWasmCallOperation(GPRInfo::argumentGPR0);
jit.setupArguments<decltype(operationWasmUnwind)>(GPRInfo::argumentGPR0);
jit.callOperation<OperationPtrTag>(operationWasmUnwind);
jit.farJump(GPRInfo::returnValueGPR, ExceptionHandlerPtrTag);
LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::WasmThunk);
codeRef.construct(FINALIZE_THUNK(patchBuffer, JITThunkPtrTag, "JSToWasm"_s, "JSToWasm"));
});
return codeRef.get();
}
MacroAssemblerCodeRef<JITThunkPtrTag> wasmFunctionThunkGenerator(VM&)
{
return createJSToWasmJITShared();
}
static size_t trampolineReservedStackSize()
{
// If we are jumping to the function which can have stack-overflow check,
// then, trampoline does not need to do the check again if it is smaller than a threshold.
// 1. Caller of this trampoline ensures that at least our stack is lower than softStackLimit.
// 2. Callee may omit stack check if the frame size is less than reservedZoneSize and it does not have a call.
// Based on that, trampoline between 1 and 2 can use (softReservedZoneSize - reservedZoneSize) / 2 size safely at least.
// Note that minimumReservedZoneSize is 16KB, and we ensure that softReservedZoneSize - reservedZoneSize is at least 16KB.
return (Options::softReservedZoneSize() - Options::reservedZoneSize()) / 2;
}
static RegisterAtOffsetList usedCalleeSaveRegisters(const Wasm::FunctionSignature& signature)
{
// Pessimistically save callee saves in BoundsChecking mode since the LLInt always bounds checks
RegisterSetBuilder calleeSaves = RegisterSetBuilder::wasmPinnedRegisters();
// FIXME: Is it really worth considering functions that have void() signature? Are those actually common?
if (signature.argumentCount() || !signature.returnsVoid()) {
RegisterSetBuilder tagCalleeSaves = RegisterSetBuilder::vmCalleeSaveRegisters();
tagCalleeSaves.filter(RegisterSetBuilder::runtimeTagRegisters());
calleeSaves.merge(tagCalleeSaves);
}
return RegisterAtOffsetList { calleeSaves.buildAndValidate(), RegisterAtOffsetList::OffsetBaseType::FramePointerBased };
}
CodePtr<JSEntryPtrTag> FunctionSignature::jsToWasmICEntrypoint() const
{
if (LIKELY(m_jsToWasmICCallee)) {
ASSERT(m_jsToWasmICCallee->jsEntrypoint());
return m_jsToWasmICCallee->jsEntrypoint();
}
if (Options::forceICFailure() || !Options::useWasmJIT())
return nullptr;
Locker locker(m_jitCodeLock);
// Someone else could have been creating the code when we checked before and blocked us before getting here.
if (m_jsToWasmICCallee)
return m_jsToWasmICCallee->jsEntrypoint();
CCallHelpers jit;
JIT_COMMENT(jit, "jsCallICEntrypoint");
ASSERT(!m_jsToWasmICCallee);
Ref<JSToWasmICCallee> jsToWasmICCallee = JSToWasmICCallee::create(usedCalleeSaveRegisters(*this));
const RegisterAtOffsetList& registersToSpill = *jsToWasmICCallee->calleeSaveRegistersImpl();
const Wasm::WasmCallingConvention& wasmCC = Wasm::wasmCallingConvention();
Wasm::CallInformation wasmCallInfo = wasmCC.callInformationFor(*this);
if (UNLIKELY(argumentsOrResultsIncludeV128() || argumentsOrResultsIncludeExnref()))
return nullptr;
Wasm::CallInformation jsCallInfo = Wasm::jsCallingConvention().callInformationFor(*this, Wasm::CallRole::Callee);
RegisterAtOffsetList savedResultRegisters = wasmCallInfo.computeResultsOffsetList();
unsigned totalFrameSize = registersToSpill.sizeOfAreaInBytes();
totalFrameSize += sizeof(CPURegister); // Slot for the VM's previous wasm instance.
totalFrameSize += wasmCallInfo.headerAndArgumentStackSizeInBytes;
totalFrameSize += savedResultRegisters.sizeOfAreaInBytes();
totalFrameSize = WTF::roundUpToMultipleOf<stackAlignmentBytes()>(totalFrameSize);
#if USE(JSVALUE32_64)
if (argumentsOrResultsIncludeI64())
return nullptr;
#endif
jit.emitFunctionPrologue();
jit.subPtr(MacroAssembler::TrustedImm32(totalFrameSize), MacroAssembler::stackPointerRegister);
jit.emitSave(registersToSpill);
JSValueRegs scratchJSR {
#if USE(JSVALUE32_64)
Wasm::wasmCallingConvention().prologueScratchGPRs[2],
#endif
Wasm::wasmCallingConvention().prologueScratchGPRs[1]
};
GPRReg stackLimitGPR = Wasm::wasmCallingConvention().prologueScratchGPRs[0];
CCallHelpers::JumpList slowPath;
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::wasmContextInstancePointer);
static_assert(WebAssemblyFunction::offsetOfInstance() + sizeof(WriteBarrier<JSWebAssemblyInstance>) == WebAssemblyFunction::offsetOfBoxedWasmCallee());
jit.loadPairPtr(GPRInfo::wasmContextInstancePointer, MacroAssembler::TrustedImm32(WebAssemblyFunction::offsetOfInstance()), GPRInfo::wasmContextInstancePointer, scratchJSR.payloadGPR());
if (totalFrameSize >= trampolineReservedStackSize()) {
JIT_COMMENT(jit, "stack overflow check");
jit.loadPtr(MacroAssembler::Address(GPRInfo::wasmContextInstancePointer, JSWebAssemblyInstance::offsetOfSoftStackLimit()), stackLimitGPR);
#if !CPU(ADDRESS64)
slowPath.append(jit.branchPtr(CCallHelpers::Above, MacroAssembler::stackPointerRegister, GPRInfo::callFrameRegister));
#endif
slowPath.append(jit.branchPtr(CCallHelpers::LessThanOrEqual, MacroAssembler::stackPointerRegister, stackLimitGPR));
}
// Don't store the Wasm::Callee until after our stack check.
jit.storeWasmCalleeCallee(scratchJSR.payloadGPR());
// Ensure:
// argCountPlusThis - 1 >= argumentCount()
// argCountPlusThis >= argumentCount() + 1
// FIXME: We should handle mismatched arity
// https://bugs.webkit.org/show_bug.cgi?id=196564
if (argumentCount() > 0) {
slowPath.append(jit.branch32(CCallHelpers::Below,
CCallHelpers::payloadFor(CallFrameSlot::argumentCountIncludingThis), CCallHelpers::TrustedImm32(argumentCount() + 1)));
}
bool haveTagRegisters = false;
auto materializeTagRegistersIfNeeded = [&] {
if (!haveTagRegisters) {
haveTagRegisters = true;
jit.emitMaterializeTagCheckRegisters();
}
};
// Loop backwards so we can use the first FP/GP argument as a scratch.
FPRReg scratchFPR = Wasm::wasmCallingConvention().fprArgs[0];
GPRReg scratchGPR = Wasm::wasmCallingConvention().jsrArgs[0].payloadGPR();
CCallHelpers::Address calleeFrame = CCallHelpers::Address(MacroAssembler::stackPointerRegister, 0);
for (unsigned i = argumentCount(); i--;) {
CCallHelpers::Address jsParam(GPRInfo::callFrameRegister, jsCallInfo.params[i].location.offsetFromFP());
bool isStack = wasmCallInfo.params[i].location.isStackArgument();
auto type = argumentType(i);
JIT_COMMENT(jit, "Arg ", i, " : ", type);
switch (type.kind) {
case Wasm::TypeKind::I32: {
materializeTagRegistersIfNeeded();
jit.loadValue(jsParam, scratchJSR);
slowPath.append(jit.branchIfNotInt32(scratchJSR));
if (isStack) {
CCallHelpers::Address addr { calleeFrame.withOffset(wasmCallInfo.params[i].location.offsetFromSP()) };
jit.store32(scratchJSR.payloadGPR(), addr.withOffset(PayloadOffset));
#if USE(JSVALUE32_64)
jit.store32(CCallHelpers::TrustedImm32(0), addr.withOffset(TagOffset));
#endif
} else {
jit.zeroExtend32ToWord(scratchJSR.payloadGPR(), wasmCallInfo.params[i].location.jsr().payloadGPR());
#if USE(JSVALUE32_64)
jit.move(CCallHelpers::TrustedImm32(0), wasmCallInfo.params[i].location.jsr().tagGPR());
#endif
}
break;
}
case Wasm::TypeKind::I64: {
#if USE(JSVALUE64)
jit.loadValue(jsParam, scratchJSR);
slowPath.append(jit.branchIfNotCell(scratchJSR));
slowPath.append(jit.branchIfNotHeapBigInt(scratchJSR.payloadGPR()));
if (isStack) {
// Since we're looping backwards we don't have to worry about the arguments being in registers yet so we can use them as scratches.
jit.toBigInt64(scratchJSR.payloadGPR(), stackLimitGPR, scratchGPR, Wasm::wasmCallingConvention().jsrArgs[1].payloadGPR());
jit.store64(stackLimitGPR, calleeFrame.withOffset(wasmCallInfo.params[i].location.offsetFromSP()));
} else {
static_assert(isX86() || noOverlap(GPRInfo::wasmBaseMemoryPointer, GPRInfo::numberTagRegister, GPRInfo::notCellMaskRegister));
GPRReg scratch = isX86() ? scratchGPR : GPRInfo::wasmBaseMemoryPointer;
if (wasmCallInfo.params[i].location.jsr().payloadGPR() == scratch) {
scratch = GPRInfo::numberTagRegister;
// FIXME: In theory this only needs to restore the numberTagRegister not both but this is rare.
haveTagRegisters = false;
}
jit.toBigInt64(scratchJSR.payloadGPR(), wasmCallInfo.params[i].location.jsr().payloadGPR(), stackLimitGPR, scratch);
}
#else
UNUSED_PARAM(scratchGPR);
UNREACHABLE_FOR_PLATFORM();
#endif
break;
}
case Wasm::TypeKind::Ref:
case Wasm::TypeKind::RefNull:
case Wasm::TypeKind::Funcref:
case Wasm::TypeKind::Externref: {
if (Wasm::isFuncref(type) || (Wasm::isRefWithTypeIndex(type) && Wasm::TypeInformation::get(type.index).is<Wasm::FunctionSignature>())) {
// Ensure we have a WASM exported function.
jit.loadValue(jsParam, scratchJSR);
auto isNull = jit.branchIfNull(scratchJSR);
if (!type.isNullable())
slowPath.append(isNull);
slowPath.append(jit.branchIfNotCell(scratchJSR));
jit.emitLoadStructure(scratchJSR.payloadGPR(), scratchJSR.payloadGPR());
jit.loadCompactPtr(CCallHelpers::Address(scratchJSR.payloadGPR(), Structure::classInfoOffset()), scratchJSR.payloadGPR());
static_assert(std::is_final<WebAssemblyFunction>::value, "We do not check for subtypes below");
static_assert(std::is_final<WebAssemblyWrapperFunction>::value, "We do not check for subtypes below");
auto isWasmFunction = jit.branchPtr(CCallHelpers::Equal, scratchJSR.payloadGPR(), CCallHelpers::TrustedImmPtr(WebAssemblyFunction::info()));
slowPath.append(jit.branchPtr(CCallHelpers::NotEqual, scratchJSR.payloadGPR(), CCallHelpers::TrustedImmPtr(WebAssemblyWrapperFunction::info())));
isWasmFunction.link(&jit);
if (Wasm::isRefWithTypeIndex(type)) {
jit.loadPtr(jsParam, scratchJSR.payloadGPR());
jit.loadPtr(CCallHelpers::Address(scratchJSR.payloadGPR(), WebAssemblyFunctionBase::offsetOfSignatureIndex()), scratchJSR.payloadGPR());
slowPath.append(jit.branchPtr(CCallHelpers::NotEqual, scratchJSR.payloadGPR(), CCallHelpers::TrustedImmPtr(type.index)));
}
if (type.isNullable())
isNull.link(&jit);
} else if (!Wasm::isExternref(type)) {
// FIXME: this should implement some fast paths for, e.g., i31refs and other
// types that can be easily handled.
slowPath.append(jit.jump());
}
if (isStack) {
jit.loadValue(jsParam, scratchJSR);
if (!type.isNullable())
slowPath.append(jit.branchIfNull(scratchJSR));
jit.storeValue(scratchJSR, calleeFrame.withOffset(wasmCallInfo.params[i].location.offsetFromSP()));
} else {
auto externJSR = wasmCallInfo.params[i].location.jsr();
jit.loadValue(jsParam, externJSR);
if (!type.isNullable())
slowPath.append(jit.branchIfNull(externJSR));
}
break;
}
case Wasm::TypeKind::F32:
case Wasm::TypeKind::F64: {
materializeTagRegistersIfNeeded();
if (!isStack)
scratchFPR = wasmCallInfo.params[i].location.fpr();
jit.loadValue(jsParam, scratchJSR);
#if USE(JSVALUE64)
slowPath.append(jit.branchIfNotNumber(scratchJSR, InvalidGPRReg));
#elif USE(JSVALUE32_64)
slowPath.append(jit.branchIfNotNumber(scratchJSR, stackLimitGPR));
#endif
auto isInt32 = jit.branchIfInt32(scratchJSR);
#if USE(JSVALUE64)
jit.unboxDouble(scratchJSR.payloadGPR(), scratchJSR.payloadGPR(), scratchFPR);
#elif USE(JSVALUE32_64)
jit.unboxDouble(scratchJSR, scratchFPR);
#endif
if (argumentType(i).isF32())
jit.convertDoubleToFloat(scratchFPR, scratchFPR);
auto done = jit.jump();
isInt32.link(&jit);
if (argumentType(i).isF32())
jit.convertInt32ToFloat(scratchJSR.payloadGPR(), scratchFPR);
else
jit.convertInt32ToDouble(scratchJSR.payloadGPR(), scratchFPR);
done.link(&jit);
if (isStack) {
CCallHelpers::Address addr { calleeFrame.withOffset(wasmCallInfo.params[i].location.offsetFromSP()) };
if (argumentType(i).isF32()) {
jit.storeFloat(scratchFPR, addr.withOffset(PayloadOffset));
#if USE(JSVALUE32_64)
jit.store32(CCallHelpers::TrustedImm32(0), addr.withOffset(TagOffset));
#endif
} else
jit.storeDouble(scratchFPR, addr);
}
break;
}
case Wasm::TypeKind::V128:
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
// At this point, we're committed to doing a fast call.
#if !CPU(ARM) // ARM has no pinned registers for Wasm Memory, so no need to set them up
// We don't know what memory mode we're about to call into but it's always valid to fill both bounds checking and base memory.
jit.loadPairPtr(GPRInfo::wasmContextInstancePointer, CCallHelpers::TrustedImm32(JSWebAssemblyInstance::offsetOfCachedMemory()), GPRInfo::wasmBaseMemoryPointer, GPRInfo::wasmBoundsCheckingSizeRegister);
jit.cageConditionally(Gigacage::Primitive, GPRInfo::wasmBaseMemoryPointer, stackLimitGPR, scratchJSR.payloadGPR());
#endif
// FIXME: We could load this much earlier on ARM64 since we have a ton of scratch registers and already have callee in a register. Maybe that's profitable?
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), stackLimitGPR);
jit.loadPtr(MacroAssembler::Address(stackLimitGPR, WebAssemblyFunction::offsetOfEntrypointLoadLocation()), stackLimitGPR);
jit.loadPtr(MacroAssembler::Address(stackLimitGPR), stackLimitGPR);
jit.move(CCallHelpers::TrustedImmPtr(CalleeBits::boxNativeCallee(jsToWasmICCallee.ptr())), scratchJSR.payloadGPR());
#if USE(JSVALUE32_64)
jit.storePtr(scratchJSR.payloadGPR(), CCallHelpers::addressFor(CallFrameSlot::callee));
jit.store32(CCallHelpers::TrustedImm32(JSValue::NativeCalleeTag), CCallHelpers::addressFor(CallFrameSlot::callee).withOffset(TagOffset));
jit.storePtr(GPRInfo::wasmContextInstancePointer, CCallHelpers::addressFor(CallFrameSlot::codeBlock));
#else
static_assert(CallFrameSlot::codeBlock + 1 == CallFrameSlot::callee);
jit.storePairPtr(GPRInfo::wasmContextInstancePointer, scratchJSR.payloadGPR(), GPRInfo::callFrameRegister, CCallHelpers::TrustedImm32(CallFrameSlot::codeBlock * sizeof(Register)));
#endif
JIT_COMMENT(jit, "Make the call");
jit.call(stackLimitGPR, WasmEntryPtrTag);
// Restore stack pointer after call. We want to do this before marshalling results since stack results are stored at the top of the frame we created.
jit.addPtr(MacroAssembler::TrustedImm32(-static_cast<int32_t>(totalFrameSize)), MacroAssembler::framePointerRegister, MacroAssembler::stackPointerRegister);
CCallHelpers::JumpList exceptionChecks;
// FIXME: This assumes we don't have tag registers but we could just rematerialize them here since we already saved them.
marshallJSResult(jit, *this, wasmCallInfo, savedResultRegisters, exceptionChecks);
ASSERT(!RegisterSetBuilder::runtimeTagRegisters().contains(GPRInfo::nonPreservedNonReturnGPR, IgnoreVectors));
jit.emitRestore(registersToSpill, GPRInfo::callFrameRegister);
jit.emitFunctionEpilogue();
jit.ret();
slowPath.link(&jit);
JIT_COMMENT(jit, "Slow path start");
jit.emitRestore(registersToSpill, GPRInfo::callFrameRegister);
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::regT0);
jit.emitFunctionEpilogue();
#if CPU(ARM64E)
jit.untagReturnAddress(scratchJSR.payloadGPR());
#endif
jit.loadPtr(CCallHelpers::Address(GPRInfo::regT0, JSFunction::offsetOfExecutableOrRareData()), scratchJSR.payloadGPR());
auto hasExecutable = jit.branchTestPtr(CCallHelpers::Zero, scratchJSR.payloadGPR(), CCallHelpers::TrustedImm32(JSFunction::rareDataTag));
jit.loadPtr(CCallHelpers::Address(scratchJSR.payloadGPR(), FunctionRareData::offsetOfExecutable() - JSFunction::rareDataTag), scratchJSR.payloadGPR());
hasExecutable.link(&jit);
jit.loadPtr(CCallHelpers::Address(scratchJSR.payloadGPR(), ExecutableBase::offsetOfJITCodeWithArityCheckFor(CodeForCall)), scratchJSR.payloadGPR());
JIT_COMMENT(jit, "Slow path jump");
jit.farJump(scratchJSR.payloadGPR(), JSEntryPtrTag);
exceptionChecks.link(&jit);
JIT_COMMENT(jit, "Exception handle start");
jit.loadPtr(CCallHelpers::Address(GPRInfo::wasmContextInstancePointer, JSWebAssemblyInstance::offsetOfVM()), GPRInfo::argumentGPR0);
jit.copyCalleeSavesToVMEntryFrameCalleeSavesBuffer(GPRInfo::argumentGPR0);
jit.prepareWasmCallOperation(GPRInfo::wasmContextInstancePointer);
jit.setupArguments<decltype(Wasm::operationWasmUnwind)>(GPRInfo::wasmContextInstancePointer);
jit.callOperation<OperationPtrTag>(Wasm::operationWasmUnwind);
JIT_COMMENT(jit, "Exception handle jump");
jit.farJump(GPRInfo::returnValueGPR, ExceptionHandlerPtrTag);
LinkBuffer linkBuffer(jit, nullptr, LinkBuffer::Profile::WasmThunk, JITCompilationCanFail);
if (UNLIKELY(linkBuffer.didFailToAllocate()))
return nullptr;
auto code = FINALIZE_WASM_CODE(linkBuffer, JSEntryPtrTag, nullptr, "JS->Wasm IC %s", WTF::toCString(*this).data());
jsToWasmICCallee->setEntrypoint(WTFMove(code));
WTF::storeStoreFence();
m_jsToWasmICCallee = WTFMove(jsToWasmICCallee);
return m_jsToWasmICCallee->jsEntrypoint();
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY) && ENABLE(JIT)
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