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-rw-r--r--js/src/wasm/WasmBuiltins.cpp1980
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diff --git a/js/src/wasm/WasmBuiltins.cpp b/js/src/wasm/WasmBuiltins.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ *
+ * Copyright 2017 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/WasmBuiltins.h"
+
+#include "mozilla/Atomics.h"
+
+#include "fdlibm.h"
+#include "jslibmath.h"
+#include "jsmath.h"
+
+#include "gc/Allocator.h"
+#include "jit/AtomicOperations.h"
+#include "jit/InlinableNatives.h"
+#include "jit/MacroAssembler.h"
+#include "jit/Simulator.h"
+#include "js/experimental/JitInfo.h" // JSJitInfo
+#include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_*
+#include "js/friend/StackLimits.h" // js::AutoCheckRecursionLimit
+#include "threading/Mutex.h"
+#include "util/Memory.h"
+#include "util/Poison.h"
+#include "vm/BigIntType.h"
+#include "vm/ErrorObject.h"
+#include "wasm/WasmCodegenTypes.h"
+#include "wasm/WasmDebug.h"
+#include "wasm/WasmDebugFrame.h"
+#include "wasm/WasmGcObject.h"
+#include "wasm/WasmInstance.h"
+#include "wasm/WasmStubs.h"
+
+#include "debugger/DebugAPI-inl.h"
+#include "vm/ErrorObject-inl.h"
+#include "vm/Stack-inl.h"
+#include "wasm/WasmInstance-inl.h"
+
+using namespace js;
+using namespace jit;
+using namespace wasm;
+
+using mozilla::HashGeneric;
+using mozilla::MakeEnumeratedRange;
+
+static const unsigned BUILTIN_THUNK_LIFO_SIZE = 64 * 1024;
+
+// ============================================================================
+// WebAssembly builtin C++ functions called from wasm code to implement internal
+// wasm operations: type descriptions.
+
+// Some abbreviations, for the sake of conciseness.
+#define _F64 MIRType::Double
+#define _F32 MIRType::Float32
+#define _I32 MIRType::Int32
+#define _I64 MIRType::Int64
+#define _PTR MIRType::Pointer
+#define _RoN MIRType::RefOrNull
+#define _VOID MIRType::None
+#define _END MIRType::None
+#define _Infallible FailureMode::Infallible
+#define _FailOnNegI32 FailureMode::FailOnNegI32
+#define _FailOnNullPtr FailureMode::FailOnNullPtr
+#define _FailOnInvalidRef FailureMode::FailOnInvalidRef
+
+namespace js {
+namespace wasm {
+
+const SymbolicAddressSignature SASigSinNativeD = {
+ SymbolicAddress::SinNativeD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigSinFdlibmD = {
+ SymbolicAddress::SinFdlibmD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigCosNativeD = {
+ SymbolicAddress::CosNativeD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigCosFdlibmD = {
+ SymbolicAddress::CosFdlibmD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigTanNativeD = {
+ SymbolicAddress::TanNativeD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigTanFdlibmD = {
+ SymbolicAddress::TanFdlibmD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigASinD = {
+ SymbolicAddress::ASinD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigACosD = {
+ SymbolicAddress::ACosD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigATanD = {
+ SymbolicAddress::ATanD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigCeilD = {
+ SymbolicAddress::CeilD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigCeilF = {
+ SymbolicAddress::CeilF, _F32, _Infallible, 1, {_F32, _END}};
+const SymbolicAddressSignature SASigFloorD = {
+ SymbolicAddress::FloorD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigFloorF = {
+ SymbolicAddress::FloorF, _F32, _Infallible, 1, {_F32, _END}};
+const SymbolicAddressSignature SASigTruncD = {
+ SymbolicAddress::TruncD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigTruncF = {
+ SymbolicAddress::TruncF, _F32, _Infallible, 1, {_F32, _END}};
+const SymbolicAddressSignature SASigNearbyIntD = {
+ SymbolicAddress::NearbyIntD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigNearbyIntF = {
+ SymbolicAddress::NearbyIntF, _F32, _Infallible, 1, {_F32, _END}};
+const SymbolicAddressSignature SASigExpD = {
+ SymbolicAddress::ExpD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigLogD = {
+ SymbolicAddress::LogD, _F64, _Infallible, 1, {_F64, _END}};
+const SymbolicAddressSignature SASigPowD = {
+ SymbolicAddress::PowD, _F64, _Infallible, 2, {_F64, _F64, _END}};
+const SymbolicAddressSignature SASigATan2D = {
+ SymbolicAddress::ATan2D, _F64, _Infallible, 2, {_F64, _F64, _END}};
+const SymbolicAddressSignature SASigMemoryGrowM32 = {
+ SymbolicAddress::MemoryGrowM32, _I32, _Infallible, 2, {_PTR, _I32, _END}};
+const SymbolicAddressSignature SASigMemoryGrowM64 = {
+ SymbolicAddress::MemoryGrowM64, _I64, _Infallible, 2, {_PTR, _I64, _END}};
+const SymbolicAddressSignature SASigMemorySizeM32 = {
+ SymbolicAddress::MemorySizeM32, _I32, _Infallible, 1, {_PTR, _END}};
+const SymbolicAddressSignature SASigMemorySizeM64 = {
+ SymbolicAddress::MemorySizeM64, _I64, _Infallible, 1, {_PTR, _END}};
+const SymbolicAddressSignature SASigWaitI32M32 = {
+ SymbolicAddress::WaitI32M32,
+ _I32,
+ _FailOnNegI32,
+ 4,
+ {_PTR, _I32, _I32, _I64, _END}};
+const SymbolicAddressSignature SASigWaitI32M64 = {
+ SymbolicAddress::WaitI32M64,
+ _I32,
+ _FailOnNegI32,
+ 4,
+ {_PTR, _I64, _I32, _I64, _END}};
+const SymbolicAddressSignature SASigWaitI64M32 = {
+ SymbolicAddress::WaitI64M32,
+ _I32,
+ _FailOnNegI32,
+ 4,
+ {_PTR, _I32, _I64, _I64, _END}};
+const SymbolicAddressSignature SASigWaitI64M64 = {
+ SymbolicAddress::WaitI64M64,
+ _I32,
+ _FailOnNegI32,
+ 4,
+ {_PTR, _I64, _I64, _I64, _END}};
+const SymbolicAddressSignature SASigWakeM32 = {
+ SymbolicAddress::WakeM32, _I32, _FailOnNegI32, 3, {_PTR, _I32, _I32, _END}};
+const SymbolicAddressSignature SASigWakeM64 = {
+ SymbolicAddress::WakeM64, _I32, _FailOnNegI32, 3, {_PTR, _I64, _I32, _END}};
+const SymbolicAddressSignature SASigMemCopyM32 = {
+ SymbolicAddress::MemCopyM32,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I32, _I32, _I32, _PTR, _END}};
+const SymbolicAddressSignature SASigMemCopySharedM32 = {
+ SymbolicAddress::MemCopySharedM32,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I32, _I32, _I32, _PTR, _END}};
+const SymbolicAddressSignature SASigMemCopyM64 = {
+ SymbolicAddress::MemCopyM64,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I64, _I64, _I64, _PTR, _END}};
+const SymbolicAddressSignature SASigMemCopySharedM64 = {
+ SymbolicAddress::MemCopySharedM64,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I64, _I64, _I64, _PTR, _END}};
+const SymbolicAddressSignature SASigDataDrop = {
+ SymbolicAddress::DataDrop, _VOID, _FailOnNegI32, 2, {_PTR, _I32, _END}};
+const SymbolicAddressSignature SASigMemFillM32 = {
+ SymbolicAddress::MemFillM32,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I32, _I32, _I32, _PTR, _END}};
+const SymbolicAddressSignature SASigMemFillSharedM32 = {
+ SymbolicAddress::MemFillSharedM32,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I32, _I32, _I32, _PTR, _END}};
+const SymbolicAddressSignature SASigMemFillM64 = {
+ SymbolicAddress::MemFillM64,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I64, _I32, _I64, _PTR, _END}};
+const SymbolicAddressSignature SASigMemFillSharedM64 = {
+ SymbolicAddress::MemFillSharedM64,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I64, _I32, _I64, _PTR, _END}};
+const SymbolicAddressSignature SASigMemDiscardM32 = {
+ SymbolicAddress::MemDiscardM32,
+ _VOID,
+ _FailOnNegI32,
+ 4,
+ {_PTR, _I32, _I32, _PTR, _END}};
+const SymbolicAddressSignature SASigMemDiscardSharedM32 = {
+ SymbolicAddress::MemDiscardSharedM32,
+ _VOID,
+ _FailOnNegI32,
+ 4,
+ {_PTR, _I32, _I32, _PTR, _END}};
+const SymbolicAddressSignature SASigMemDiscardM64 = {
+ SymbolicAddress::MemDiscardM64,
+ _VOID,
+ _FailOnNegI32,
+ 4,
+ {_PTR, _I64, _I64, _PTR, _END}};
+const SymbolicAddressSignature SASigMemDiscardSharedM64 = {
+ SymbolicAddress::MemDiscardSharedM64,
+ _VOID,
+ _FailOnNegI32,
+ 4,
+ {_PTR, _I64, _I64, _PTR, _END}};
+const SymbolicAddressSignature SASigMemInitM32 = {
+ SymbolicAddress::MemInitM32,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I32, _I32, _I32, _I32, _END}};
+const SymbolicAddressSignature SASigMemInitM64 = {
+ SymbolicAddress::MemInitM64,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I64, _I32, _I32, _I32, _END}};
+const SymbolicAddressSignature SASigTableCopy = {
+ SymbolicAddress::TableCopy,
+ _VOID,
+ _FailOnNegI32,
+ 6,
+ {_PTR, _I32, _I32, _I32, _I32, _I32, _END}};
+const SymbolicAddressSignature SASigElemDrop = {
+ SymbolicAddress::ElemDrop, _VOID, _FailOnNegI32, 2, {_PTR, _I32, _END}};
+const SymbolicAddressSignature SASigTableFill = {
+ SymbolicAddress::TableFill,
+ _VOID,
+ _FailOnNegI32,
+ 5,
+ {_PTR, _I32, _RoN, _I32, _I32, _END}};
+const SymbolicAddressSignature SASigTableGet = {SymbolicAddress::TableGet,
+ _RoN,
+ _FailOnInvalidRef,
+ 3,
+ {_PTR, _I32, _I32, _END}};
+const SymbolicAddressSignature SASigTableGrow = {
+ SymbolicAddress::TableGrow,
+ _I32,
+ _Infallible,
+ 4,
+ {_PTR, _RoN, _I32, _I32, _END}};
+const SymbolicAddressSignature SASigTableInit = {
+ SymbolicAddress::TableInit,
+ _VOID,
+ _FailOnNegI32,
+ 6,
+ {_PTR, _I32, _I32, _I32, _I32, _I32, _END}};
+const SymbolicAddressSignature SASigTableSet = {SymbolicAddress::TableSet,
+ _VOID,
+ _FailOnNegI32,
+ 4,
+ {_PTR, _I32, _RoN, _I32, _END}};
+const SymbolicAddressSignature SASigTableSize = {
+ SymbolicAddress::TableSize, _I32, _Infallible, 2, {_PTR, _I32, _END}};
+const SymbolicAddressSignature SASigRefFunc = {
+ SymbolicAddress::RefFunc, _RoN, _FailOnInvalidRef, 2, {_PTR, _I32, _END}};
+const SymbolicAddressSignature SASigPostBarrier = {
+ SymbolicAddress::PostBarrier, _VOID, _Infallible, 2, {_PTR, _PTR, _END}};
+const SymbolicAddressSignature SASigPostBarrierPrecise = {
+ SymbolicAddress::PostBarrierPrecise,
+ _VOID,
+ _Infallible,
+ 3,
+ {_PTR, _PTR, _RoN, _END}};
+const SymbolicAddressSignature SASigPostBarrierPreciseWithOffset = {
+ SymbolicAddress::PostBarrierPreciseWithOffset,
+ _VOID,
+ _Infallible,
+ 4,
+ {_PTR, _PTR, _I32, _RoN, _END}};
+const SymbolicAddressSignature SASigExceptionNew = {
+ SymbolicAddress::ExceptionNew, _RoN, _FailOnNullPtr, 2, {_PTR, _RoN, _END}};
+const SymbolicAddressSignature SASigThrowException = {
+ SymbolicAddress::ThrowException,
+ _VOID,
+ _FailOnNegI32,
+ 2,
+ {_PTR, _RoN, _END}};
+const SymbolicAddressSignature SASigStructNew = {
+ SymbolicAddress::StructNew, _RoN, _FailOnNullPtr, 2, {_PTR, _PTR, _END}};
+const SymbolicAddressSignature SASigStructNewUninit = {
+ SymbolicAddress::StructNewUninit,
+ _RoN,
+ _FailOnNullPtr,
+ 2,
+ {_PTR, _PTR, _END}};
+const SymbolicAddressSignature SASigArrayNew = {SymbolicAddress::ArrayNew,
+ _RoN,
+ _FailOnNullPtr,
+ 3,
+ {_PTR, _I32, _PTR, _END}};
+const SymbolicAddressSignature SASigArrayNewUninit = {
+ SymbolicAddress::ArrayNewUninit,
+ _RoN,
+ _FailOnNullPtr,
+ 3,
+ {_PTR, _I32, _PTR, _END}};
+const SymbolicAddressSignature SASigArrayNewData = {
+ SymbolicAddress::ArrayNewData,
+ _RoN,
+ _FailOnNullPtr,
+ 5,
+ {_PTR, _I32, _I32, _PTR, _I32, _END}};
+const SymbolicAddressSignature SASigArrayNewElem = {
+ SymbolicAddress::ArrayNewElem,
+ _RoN,
+ _FailOnNullPtr,
+ 5,
+ {_PTR, _I32, _I32, _PTR, _I32, _END}};
+const SymbolicAddressSignature SASigArrayCopy = {
+ SymbolicAddress::ArrayCopy,
+ _VOID,
+ _FailOnNegI32,
+ 7,
+ {_PTR, _RoN, _I32, _RoN, _I32, _I32, _I32, _END}};
+
+#define DECL_SAS_FOR_INTRINSIC(op, export, sa_name, abitype, entry, idx) \
+ const SymbolicAddressSignature SASig##sa_name = { \
+ SymbolicAddress::sa_name, _VOID, _FailOnNegI32, \
+ DECLARE_INTRINSIC_PARAM_TYPES_##op};
+
+FOR_EACH_INTRINSIC(DECL_SAS_FOR_INTRINSIC)
+#undef DECL_SAS_FOR_INTRINSIC
+
+} // namespace wasm
+} // namespace js
+
+#undef _F64
+#undef _F32
+#undef _I32
+#undef _I64
+#undef _PTR
+#undef _RoN
+#undef _VOID
+#undef _END
+#undef _Infallible
+#undef _FailOnNegI32
+#undef _FailOnNullPtr
+
+#ifdef DEBUG
+ABIArgType ToABIType(FailureMode mode) {
+ switch (mode) {
+ case FailureMode::FailOnNegI32:
+ return ArgType_Int32;
+ case FailureMode::FailOnNullPtr:
+ case FailureMode::FailOnInvalidRef:
+ return ArgType_General;
+ default:
+ MOZ_CRASH("unexpected failure mode");
+ }
+}
+
+ABIArgType ToABIType(MIRType type) {
+ switch (type) {
+ case MIRType::None:
+ case MIRType::Int32:
+ return ArgType_Int32;
+ case MIRType::Int64:
+ return ArgType_Int64;
+ case MIRType::Pointer:
+ case MIRType::RefOrNull:
+ return ArgType_General;
+ case MIRType::Float32:
+ return ArgType_Float32;
+ case MIRType::Double:
+ return ArgType_Float64;
+ default:
+ MOZ_CRASH("unexpected type");
+ }
+}
+
+ABIFunctionType ToABIType(const SymbolicAddressSignature& sig) {
+ MOZ_ASSERT_IF(sig.failureMode != FailureMode::Infallible,
+ ToABIType(sig.failureMode) == ToABIType(sig.retType));
+ int abiType = ToABIType(sig.retType) << RetType_Shift;
+ for (int i = 0; i < sig.numArgs; i++) {
+ abiType |= (ToABIType(sig.argTypes[i]) << (ArgType_Shift * (i + 1)));
+ }
+ return ABIFunctionType(abiType);
+}
+#endif
+
+// ============================================================================
+// WebAssembly builtin C++ functions called from wasm code to implement internal
+// wasm operations: implementations.
+
+#if defined(JS_CODEGEN_ARM)
+extern "C" {
+
+extern MOZ_EXPORT int64_t __aeabi_idivmod(int, int);
+
+extern MOZ_EXPORT int64_t __aeabi_uidivmod(int, int);
+}
+#endif
+
+// This utility function can only be called for builtins that are called
+// directly from wasm code.
+static JitActivation* CallingActivation(JSContext* cx) {
+ Activation* act = cx->activation();
+ MOZ_ASSERT(act->asJit()->hasWasmExitFP());
+ return act->asJit();
+}
+
+static bool WasmHandleDebugTrap() {
+ JSContext* cx = TlsContext.get(); // Cold code
+ JitActivation* activation = CallingActivation(cx);
+ Frame* fp = activation->wasmExitFP();
+ Instance* instance = GetNearestEffectiveInstance(fp);
+ const Code& code = instance->code();
+ MOZ_ASSERT(code.metadata().debugEnabled);
+
+ // The debug trap stub is the innermost frame. It's return address is the
+ // actual trap site.
+ const CallSite* site = code.lookupCallSite(fp->returnAddress());
+ MOZ_ASSERT(site);
+
+ // Advance to the actual trapping frame.
+ fp = fp->wasmCaller();
+ DebugFrame* debugFrame = DebugFrame::from(fp);
+
+ if (site->kind() == CallSite::EnterFrame) {
+ if (!instance->debug().enterFrameTrapsEnabled()) {
+ return true;
+ }
+ debugFrame->setIsDebuggee();
+ debugFrame->observe(cx);
+ if (!DebugAPI::onEnterFrame(cx, debugFrame)) {
+ if (cx->isPropagatingForcedReturn()) {
+ cx->clearPropagatingForcedReturn();
+ // Ignoring forced return because changing code execution order is
+ // not yet implemented in the wasm baseline.
+ // TODO properly handle forced return and resume wasm execution.
+ JS_ReportErrorASCII(cx,
+ "Unexpected resumption value from onEnterFrame");
+ }
+ return false;
+ }
+ return true;
+ }
+ if (site->kind() == CallSite::LeaveFrame) {
+ if (!debugFrame->updateReturnJSValue(cx)) {
+ return false;
+ }
+ bool ok = DebugAPI::onLeaveFrame(cx, debugFrame, nullptr, true);
+ debugFrame->leave(cx);
+ return ok;
+ }
+
+ DebugState& debug = instance->debug();
+ MOZ_ASSERT(debug.hasBreakpointTrapAtOffset(site->lineOrBytecode()));
+ if (debug.stepModeEnabled(debugFrame->funcIndex())) {
+ if (!DebugAPI::onSingleStep(cx)) {
+ if (cx->isPropagatingForcedReturn()) {
+ cx->clearPropagatingForcedReturn();
+ // TODO properly handle forced return.
+ JS_ReportErrorASCII(cx,
+ "Unexpected resumption value from onSingleStep");
+ }
+ return false;
+ }
+ }
+ if (debug.hasBreakpointSite(site->lineOrBytecode())) {
+ if (!DebugAPI::onTrap(cx)) {
+ if (cx->isPropagatingForcedReturn()) {
+ cx->clearPropagatingForcedReturn();
+ // TODO properly handle forced return.
+ JS_ReportErrorASCII(
+ cx, "Unexpected resumption value from breakpoint handler");
+ }
+ return false;
+ }
+ }
+ return true;
+}
+
+// Check if the pending exception, if any, is catchable by wasm.
+static bool HasCatchableException(JitActivation* activation, JSContext* cx,
+ MutableHandleValue exn) {
+ if (!cx->isExceptionPending()) {
+ return false;
+ }
+
+ // Traps are generally not catchable as wasm exceptions. The only case in
+ // which they are catchable is for Trap::ThrowReported, which the wasm
+ // compiler uses to throw exceptions and is the source of exceptions from C++.
+ if (activation->isWasmTrapping() &&
+ activation->wasmTrapData().trap != Trap::ThrowReported) {
+ return false;
+ }
+
+ if (cx->isThrowingOverRecursed() || cx->isThrowingOutOfMemory()) {
+ return false;
+ }
+
+ // Write the exception out here to exn to avoid having to get the pending
+ // exception and checking for OOM multiple times.
+ if (cx->getPendingException(exn)) {
+ // Check if a JS exception originated from a wasm trap.
+ if (exn.isObject() && exn.toObject().is<ErrorObject>()) {
+ ErrorObject& err = exn.toObject().as<ErrorObject>();
+ if (err.fromWasmTrap()) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ MOZ_ASSERT(cx->isThrowingOutOfMemory());
+ return false;
+}
+
+// Unwind the entire activation in response to a thrown exception. This function
+// is responsible for notifying the debugger of each unwound frame. The return
+// value is the new stack address which the calling stub will set to the sp
+// register before executing a return instruction.
+//
+// This function will also look for try-catch handlers and, if not trapping or
+// throwing an uncatchable exception, will write the handler info in the return
+// argument and return true.
+//
+// Returns false if a handler isn't found or shouldn't be used (e.g., traps).
+
+bool wasm::HandleThrow(JSContext* cx, WasmFrameIter& iter,
+ jit::ResumeFromException* rfe) {
+ // WasmFrameIter iterates down wasm frames in the activation starting at
+ // JitActivation::wasmExitFP(). Calling WasmFrameIter::startUnwinding pops
+ // JitActivation::wasmExitFP() once each time WasmFrameIter is incremented,
+ // ultimately leaving exit FP null when the WasmFrameIter is done(). This
+ // is necessary to prevent a DebugFrame from being observed again after we
+ // just called onLeaveFrame (which would lead to the frame being re-added
+ // to the map of live frames, right as it becomes trash).
+
+ MOZ_ASSERT(CallingActivation(cx) == iter.activation());
+ MOZ_ASSERT(!iter.done());
+ iter.setUnwind(WasmFrameIter::Unwind::True);
+
+ // Live wasm code on the stack is kept alive (in TraceJitActivation) by
+ // marking the instance of every wasm::Frame found by WasmFrameIter.
+ // However, as explained above, we're popping frames while iterating which
+ // means that a GC during this loop could collect the code of frames whose
+ // code is still on the stack. This is actually mostly fine: as soon as we
+ // return to the throw stub, the entire stack will be popped as a whole,
+ // returning to the C++ caller. However, we must keep the throw stub alive
+ // itself which is owned by the innermost instance.
+ Rooted<WasmInstanceObject*> keepAlive(cx, iter.instance()->object());
+
+ JitActivation* activation = CallingActivation(cx);
+ RootedValue exn(cx);
+ bool hasCatchableException = HasCatchableException(activation, cx, &exn);
+
+ for (; !iter.done(); ++iter) {
+ // Wasm code can enter same-compartment realms, so reset cx->realm to
+ // this frame's realm.
+ cx->setRealmForJitExceptionHandler(iter.instance()->realm());
+
+ // Only look for an exception handler if there's a catchable exception.
+ if (hasCatchableException) {
+ const wasm::Code& code = iter.instance()->code();
+ const uint8_t* pc = iter.resumePCinCurrentFrame();
+ Tier tier;
+ const wasm::TryNote* tryNote = code.lookupTryNote((void*)pc, &tier);
+
+ if (tryNote) {
+ cx->clearPendingException();
+ RootedAnyRef ref(cx, AnyRef::null());
+ if (!BoxAnyRef(cx, exn, &ref)) {
+ MOZ_ASSERT(cx->isThrowingOutOfMemory());
+ hasCatchableException = false;
+ continue;
+ }
+
+ MOZ_ASSERT(iter.instance() == iter.instance());
+ iter.instance()->setPendingException(ref);
+
+ rfe->kind = ExceptionResumeKind::WasmCatch;
+ rfe->framePointer = (uint8_t*)iter.frame();
+ rfe->instance = iter.instance();
+
+ rfe->stackPointer =
+ (uint8_t*)(rfe->framePointer - tryNote->landingPadFramePushed());
+ rfe->target =
+ iter.instance()->codeBase(tier) + tryNote->landingPadEntryPoint();
+
+ // Make sure to clear trapping state if we got here due to a trap.
+ if (activation->isWasmTrapping()) {
+ activation->finishWasmTrap();
+ }
+
+ return true;
+ }
+ }
+
+ if (!iter.debugEnabled()) {
+ continue;
+ }
+
+ DebugFrame* frame = iter.debugFrame();
+ frame->clearReturnJSValue();
+
+ // Assume ResumeMode::Terminate if no exception is pending --
+ // no onExceptionUnwind handlers must be fired.
+ if (cx->isExceptionPending()) {
+ if (!DebugAPI::onExceptionUnwind(cx, frame)) {
+ if (cx->isPropagatingForcedReturn()) {
+ cx->clearPropagatingForcedReturn();
+ // Unexpected trap return -- raising error since throw recovery
+ // is not yet implemented in the wasm baseline.
+ // TODO properly handle forced return and resume wasm execution.
+ JS_ReportErrorASCII(
+ cx, "Unexpected resumption value from onExceptionUnwind");
+ }
+ }
+ }
+
+ bool ok = DebugAPI::onLeaveFrame(cx, frame, nullptr, false);
+ if (ok) {
+ // Unexpected success from the handler onLeaveFrame -- raising error
+ // since throw recovery is not yet implemented in the wasm baseline.
+ // TODO properly handle success and resume wasm execution.
+ JS_ReportErrorASCII(cx, "Unexpected success from onLeaveFrame");
+ }
+ frame->leave(cx);
+ }
+
+ MOZ_ASSERT(!cx->activation()->asJit()->isWasmTrapping(),
+ "unwinding clears the trapping state");
+
+ // In case of no handler, exit wasm via ret().
+ // FailInstanceReg signals to wasm stub to do a failure return.
+ rfe->kind = ExceptionResumeKind::Wasm;
+ rfe->framePointer = (uint8_t*)iter.unwoundCallerFP();
+ rfe->stackPointer = (uint8_t*)iter.unwoundAddressOfReturnAddress();
+ rfe->instance = (Instance*)FailInstanceReg;
+ rfe->target = nullptr;
+ return false;
+}
+
+static void* WasmHandleThrow(jit::ResumeFromException* rfe) {
+ JSContext* cx = TlsContext.get(); // Cold code
+ JitActivation* activation = CallingActivation(cx);
+ WasmFrameIter iter(activation);
+ // We can ignore the return result here because the throw stub code
+ // can just check the resume kind to see if a handler was found or not.
+ HandleThrow(cx, iter, rfe);
+ return rfe;
+}
+
+// Has the same return-value convention as HandleTrap().
+static void* CheckInterrupt(JSContext* cx, JitActivation* activation) {
+ ResetInterruptState(cx);
+
+ if (!CheckForInterrupt(cx)) {
+ return nullptr;
+ }
+
+ void* resumePC = activation->wasmTrapData().resumePC;
+ activation->finishWasmTrap();
+ return resumePC;
+}
+
+// The calling convention between this function and its caller in the stub
+// generated by GenerateTrapExit() is:
+// - return nullptr if the stub should jump to the throw stub to unwind
+// the activation;
+// - return the (non-null) resumePC that should be jumped if execution should
+// resume after the trap.
+static void* WasmHandleTrap() {
+ JSContext* cx = TlsContext.get(); // Cold code
+ JitActivation* activation = CallingActivation(cx);
+
+ switch (activation->wasmTrapData().trap) {
+ case Trap::Unreachable: {
+ ReportTrapError(cx, JSMSG_WASM_UNREACHABLE);
+ return nullptr;
+ }
+ case Trap::IntegerOverflow: {
+ ReportTrapError(cx, JSMSG_WASM_INTEGER_OVERFLOW);
+ return nullptr;
+ }
+ case Trap::InvalidConversionToInteger: {
+ ReportTrapError(cx, JSMSG_WASM_INVALID_CONVERSION);
+ return nullptr;
+ }
+ case Trap::IntegerDivideByZero: {
+ ReportTrapError(cx, JSMSG_WASM_INT_DIVIDE_BY_ZERO);
+ return nullptr;
+ }
+ case Trap::IndirectCallToNull: {
+ ReportTrapError(cx, JSMSG_WASM_IND_CALL_TO_NULL);
+ return nullptr;
+ }
+ case Trap::IndirectCallBadSig: {
+ ReportTrapError(cx, JSMSG_WASM_IND_CALL_BAD_SIG);
+ return nullptr;
+ }
+ case Trap::NullPointerDereference: {
+ ReportTrapError(cx, JSMSG_WASM_DEREF_NULL);
+ return nullptr;
+ }
+ case Trap::BadCast: {
+ ReportTrapError(cx, JSMSG_WASM_BAD_CAST);
+ return nullptr;
+ }
+ case Trap::OutOfBounds: {
+ ReportTrapError(cx, JSMSG_WASM_OUT_OF_BOUNDS);
+ return nullptr;
+ }
+ case Trap::UnalignedAccess: {
+ ReportTrapError(cx, JSMSG_WASM_UNALIGNED_ACCESS);
+ return nullptr;
+ }
+ case Trap::CheckInterrupt:
+ return CheckInterrupt(cx, activation);
+ case Trap::StackOverflow: {
+ // Instance::setInterrupt() causes a fake stack overflow. Since
+ // Instance::setInterrupt() is called racily, it's possible for a real
+ // stack overflow to trap, followed by a racy call to setInterrupt().
+ // Thus, we must check for a real stack overflow first before we
+ // CheckInterrupt() and possibly resume execution.
+ AutoCheckRecursionLimit recursion(cx);
+ if (!recursion.check(cx)) {
+ return nullptr;
+ }
+ if (activation->wasmExitInstance()->isInterrupted()) {
+ return CheckInterrupt(cx, activation);
+ }
+ ReportTrapError(cx, JSMSG_OVER_RECURSED);
+ return nullptr;
+ }
+ case Trap::ThrowReported:
+ // Error was already reported under another name.
+ return nullptr;
+ case Trap::Limit:
+ break;
+ }
+
+ MOZ_CRASH("unexpected trap");
+}
+
+static void WasmReportV128JSCall() {
+ JSContext* cx = TlsContext.get(); // Cold code
+ JS_ReportErrorNumberUTF8(cx, GetErrorMessage, nullptr,
+ JSMSG_WASM_BAD_VAL_TYPE);
+}
+
+static int32_t CoerceInPlace_ToInt32(Value* rawVal) {
+ JSContext* cx = TlsContext.get(); // Cold code
+
+ int32_t i32;
+ RootedValue val(cx, *rawVal);
+ if (!ToInt32(cx, val, &i32)) {
+ *rawVal = PoisonedObjectValue(0x42);
+ return false;
+ }
+
+ *rawVal = Int32Value(i32);
+ return true;
+}
+
+static int32_t CoerceInPlace_ToBigInt(Value* rawVal) {
+ JSContext* cx = TlsContext.get(); // Cold code
+
+ RootedValue val(cx, *rawVal);
+ BigInt* bi = ToBigInt(cx, val);
+ if (!bi) {
+ *rawVal = PoisonedObjectValue(0x43);
+ return false;
+ }
+
+ *rawVal = BigIntValue(bi);
+ return true;
+}
+
+static int32_t CoerceInPlace_ToNumber(Value* rawVal) {
+ JSContext* cx = TlsContext.get(); // Cold code
+
+ double dbl;
+ RootedValue val(cx, *rawVal);
+ if (!ToNumber(cx, val, &dbl)) {
+ *rawVal = PoisonedObjectValue(0x42);
+ return false;
+ }
+
+ *rawVal = DoubleValue(dbl);
+ return true;
+}
+
+static void* BoxValue_Anyref(Value* rawVal) {
+ JSContext* cx = TlsContext.get(); // Cold code
+ RootedValue val(cx, *rawVal);
+ RootedAnyRef result(cx, AnyRef::null());
+ if (!BoxAnyRef(cx, val, &result)) {
+ return nullptr;
+ }
+ return result.get().forCompiledCode();
+}
+
+static int32_t CoerceInPlace_JitEntry(int funcExportIndex, Instance* instance,
+ Value* argv) {
+ JSContext* cx = TlsContext.get(); // Cold code
+
+ const Code& code = instance->code();
+ const FuncExport& fe =
+ code.metadata(code.stableTier()).funcExports[funcExportIndex];
+ const FuncType& funcType = code.metadata().getFuncExportType(fe);
+
+ for (size_t i = 0; i < funcType.args().length(); i++) {
+ HandleValue arg = HandleValue::fromMarkedLocation(&argv[i]);
+ switch (funcType.args()[i].kind()) {
+ case ValType::I32: {
+ int32_t i32;
+ if (!ToInt32(cx, arg, &i32)) {
+ return false;
+ }
+ argv[i] = Int32Value(i32);
+ break;
+ }
+ case ValType::I64: {
+ // In this case we store a BigInt value as there is no value type
+ // corresponding directly to an I64. The conversion to I64 happens
+ // in the JIT entry stub.
+ BigInt* bigint = ToBigInt(cx, arg);
+ if (!bigint) {
+ return false;
+ }
+ argv[i] = BigIntValue(bigint);
+ break;
+ }
+ case ValType::F32:
+ case ValType::F64: {
+ double dbl;
+ if (!ToNumber(cx, arg, &dbl)) {
+ return false;
+ }
+ // No need to convert double-to-float for f32, it's done inline
+ // in the wasm stub later.
+ argv[i] = DoubleValue(dbl);
+ break;
+ }
+ case ValType::Ref: {
+ // Guarded against by temporarilyUnsupportedReftypeForEntry()
+ MOZ_RELEASE_ASSERT(funcType.args()[i].refType().isExtern());
+ // Leave Object and Null alone, we will unbox inline. All we need
+ // to do is convert other values to an Object representation.
+ if (!arg.isObjectOrNull()) {
+ RootedAnyRef result(cx, AnyRef::null());
+ if (!BoxAnyRef(cx, arg, &result)) {
+ return false;
+ }
+ argv[i].setObject(*result.get().asJSObject());
+ }
+ break;
+ }
+ case ValType::V128: {
+ // Guarded against by hasV128ArgOrRet()
+ MOZ_CRASH("unexpected input argument in CoerceInPlace_JitEntry");
+ }
+ default: {
+ MOZ_CRASH("unexpected input argument in CoerceInPlace_JitEntry");
+ }
+ }
+ }
+
+ return true;
+}
+
+// Allocate a BigInt without GC, corresponds to the similar VMFunction.
+static BigInt* AllocateBigIntTenuredNoGC() {
+ JSContext* cx = TlsContext.get(); // Cold code (the caller is elaborate)
+
+ return cx->newCell<BigInt, NoGC>(gc::Heap::Tenured);
+}
+
+static int64_t DivI64(uint32_t x_hi, uint32_t x_lo, uint32_t y_hi,
+ uint32_t y_lo) {
+ int64_t x = ((uint64_t)x_hi << 32) + x_lo;
+ int64_t y = ((uint64_t)y_hi << 32) + y_lo;
+ MOZ_ASSERT(x != INT64_MIN || y != -1);
+ MOZ_ASSERT(y != 0);
+ return x / y;
+}
+
+static int64_t UDivI64(uint32_t x_hi, uint32_t x_lo, uint32_t y_hi,
+ uint32_t y_lo) {
+ uint64_t x = ((uint64_t)x_hi << 32) + x_lo;
+ uint64_t y = ((uint64_t)y_hi << 32) + y_lo;
+ MOZ_ASSERT(y != 0);
+ return int64_t(x / y);
+}
+
+static int64_t ModI64(uint32_t x_hi, uint32_t x_lo, uint32_t y_hi,
+ uint32_t y_lo) {
+ int64_t x = ((uint64_t)x_hi << 32) + x_lo;
+ int64_t y = ((uint64_t)y_hi << 32) + y_lo;
+ MOZ_ASSERT(x != INT64_MIN || y != -1);
+ MOZ_ASSERT(y != 0);
+ return x % y;
+}
+
+static int64_t UModI64(uint32_t x_hi, uint32_t x_lo, uint32_t y_hi,
+ uint32_t y_lo) {
+ uint64_t x = ((uint64_t)x_hi << 32) + x_lo;
+ uint64_t y = ((uint64_t)y_hi << 32) + y_lo;
+ MOZ_ASSERT(y != 0);
+ return int64_t(x % y);
+}
+
+static int64_t TruncateDoubleToInt64(double input) {
+ // Note: INT64_MAX is not representable in double. It is actually
+ // INT64_MAX + 1. Therefore also sending the failure value.
+ if (input >= double(INT64_MAX) || input < double(INT64_MIN) ||
+ std::isnan(input)) {
+ return int64_t(0x8000000000000000);
+ }
+ return int64_t(input);
+}
+
+static uint64_t TruncateDoubleToUint64(double input) {
+ // Note: UINT64_MAX is not representable in double. It is actually
+ // UINT64_MAX + 1. Therefore also sending the failure value.
+ if (input >= double(UINT64_MAX) || input <= -1.0 || std::isnan(input)) {
+ return int64_t(0x8000000000000000);
+ }
+ return uint64_t(input);
+}
+
+static int64_t SaturatingTruncateDoubleToInt64(double input) {
+ // Handle in-range values (except INT64_MIN).
+ if (fabs(input) < -double(INT64_MIN)) {
+ return int64_t(input);
+ }
+ // Handle NaN.
+ if (std::isnan(input)) {
+ return 0;
+ }
+ // Handle positive overflow.
+ if (input > 0) {
+ return INT64_MAX;
+ }
+ // Handle negative overflow.
+ return INT64_MIN;
+}
+
+static uint64_t SaturatingTruncateDoubleToUint64(double input) {
+ // Handle positive overflow.
+ if (input >= -double(INT64_MIN) * 2.0) {
+ return UINT64_MAX;
+ }
+ // Handle in-range values.
+ if (input > -1.0) {
+ return uint64_t(input);
+ }
+ // Handle NaN and negative overflow.
+ return 0;
+}
+
+static double Int64ToDouble(int32_t x_hi, uint32_t x_lo) {
+ int64_t x = int64_t((uint64_t(x_hi) << 32)) + int64_t(x_lo);
+ return double(x);
+}
+
+static float Int64ToFloat32(int32_t x_hi, uint32_t x_lo) {
+ int64_t x = int64_t((uint64_t(x_hi) << 32)) + int64_t(x_lo);
+ return float(x);
+}
+
+static double Uint64ToDouble(int32_t x_hi, uint32_t x_lo) {
+ uint64_t x = (uint64_t(x_hi) << 32) + uint64_t(x_lo);
+ return double(x);
+}
+
+static float Uint64ToFloat32(int32_t x_hi, uint32_t x_lo) {
+ uint64_t x = (uint64_t(x_hi) << 32) + uint64_t(x_lo);
+ return float(x);
+}
+
+template <class F>
+static inline void* FuncCast(F* funcPtr, ABIFunctionType abiType) {
+ void* pf = JS_FUNC_TO_DATA_PTR(void*, funcPtr);
+#ifdef JS_SIMULATOR
+ pf = Simulator::RedirectNativeFunction(pf, abiType);
+#endif
+ return pf;
+}
+
+#ifdef WASM_CODEGEN_DEBUG
+void wasm::PrintI32(int32_t val) { fprintf(stderr, "i32(%d) ", val); }
+
+void wasm::PrintPtr(uint8_t* val) { fprintf(stderr, "ptr(%p) ", val); }
+
+void wasm::PrintF32(float val) { fprintf(stderr, "f32(%f) ", val); }
+
+void wasm::PrintF64(double val) { fprintf(stderr, "f64(%lf) ", val); }
+
+void wasm::PrintText(const char* out) { fprintf(stderr, "%s", out); }
+#endif
+
+void* wasm::AddressOf(SymbolicAddress imm, ABIFunctionType* abiType) {
+ // See NeedsBuiltinThunk for a classification of the different names here.
+ switch (imm) {
+ case SymbolicAddress::HandleDebugTrap:
+ *abiType = Args_General0;
+ return FuncCast(WasmHandleDebugTrap, *abiType);
+ case SymbolicAddress::HandleThrow:
+ *abiType = Args_General1;
+ return FuncCast(WasmHandleThrow, *abiType);
+ case SymbolicAddress::HandleTrap:
+ *abiType = Args_General0;
+ return FuncCast(WasmHandleTrap, *abiType);
+ case SymbolicAddress::ReportV128JSCall:
+ *abiType = Args_General0;
+ return FuncCast(WasmReportV128JSCall, *abiType);
+ case SymbolicAddress::CallImport_General:
+ *abiType = Args_Int32_GeneralInt32Int32General;
+ return FuncCast(Instance::callImport_general, *abiType);
+ case SymbolicAddress::CoerceInPlace_ToInt32:
+ *abiType = Args_General1;
+ return FuncCast(CoerceInPlace_ToInt32, *abiType);
+ case SymbolicAddress::CoerceInPlace_ToBigInt:
+ *abiType = Args_General1;
+ return FuncCast(CoerceInPlace_ToBigInt, *abiType);
+ case SymbolicAddress::CoerceInPlace_ToNumber:
+ *abiType = Args_General1;
+ return FuncCast(CoerceInPlace_ToNumber, *abiType);
+ case SymbolicAddress::CoerceInPlace_JitEntry:
+ *abiType = Args_General3;
+ return FuncCast(CoerceInPlace_JitEntry, *abiType);
+ case SymbolicAddress::ToInt32:
+ *abiType = Args_Int_Double;
+ return FuncCast<int32_t(double)>(JS::ToInt32, *abiType);
+ case SymbolicAddress::BoxValue_Anyref:
+ *abiType = Args_General1;
+ return FuncCast(BoxValue_Anyref, *abiType);
+ case SymbolicAddress::AllocateBigInt:
+ *abiType = Args_General0;
+ return FuncCast(AllocateBigIntTenuredNoGC, *abiType);
+ case SymbolicAddress::DivI64:
+ *abiType = Args_General4;
+ return FuncCast(DivI64, *abiType);
+ case SymbolicAddress::UDivI64:
+ *abiType = Args_General4;
+ return FuncCast(UDivI64, *abiType);
+ case SymbolicAddress::ModI64:
+ *abiType = Args_General4;
+ return FuncCast(ModI64, *abiType);
+ case SymbolicAddress::UModI64:
+ *abiType = Args_General4;
+ return FuncCast(UModI64, *abiType);
+ case SymbolicAddress::TruncateDoubleToUint64:
+ *abiType = Args_Int64_Double;
+ return FuncCast(TruncateDoubleToUint64, *abiType);
+ case SymbolicAddress::TruncateDoubleToInt64:
+ *abiType = Args_Int64_Double;
+ return FuncCast(TruncateDoubleToInt64, *abiType);
+ case SymbolicAddress::SaturatingTruncateDoubleToUint64:
+ *abiType = Args_Int64_Double;
+ return FuncCast(SaturatingTruncateDoubleToUint64, *abiType);
+ case SymbolicAddress::SaturatingTruncateDoubleToInt64:
+ *abiType = Args_Int64_Double;
+ return FuncCast(SaturatingTruncateDoubleToInt64, *abiType);
+ case SymbolicAddress::Uint64ToDouble:
+ *abiType = Args_Double_IntInt;
+ return FuncCast(Uint64ToDouble, *abiType);
+ case SymbolicAddress::Uint64ToFloat32:
+ *abiType = Args_Float32_IntInt;
+ return FuncCast(Uint64ToFloat32, *abiType);
+ case SymbolicAddress::Int64ToDouble:
+ *abiType = Args_Double_IntInt;
+ return FuncCast(Int64ToDouble, *abiType);
+ case SymbolicAddress::Int64ToFloat32:
+ *abiType = Args_Float32_IntInt;
+ return FuncCast(Int64ToFloat32, *abiType);
+#if defined(JS_CODEGEN_ARM)
+ case SymbolicAddress::aeabi_idivmod:
+ *abiType = Args_General2;
+ return FuncCast(__aeabi_idivmod, *abiType);
+ case SymbolicAddress::aeabi_uidivmod:
+ *abiType = Args_General2;
+ return FuncCast(__aeabi_uidivmod, *abiType);
+#endif
+ case SymbolicAddress::ModD:
+ *abiType = Args_Double_DoubleDouble;
+ return FuncCast(NumberMod, *abiType);
+ case SymbolicAddress::SinNativeD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(sin, *abiType);
+ case SymbolicAddress::SinFdlibmD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::sin, *abiType);
+ case SymbolicAddress::CosNativeD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(cos, *abiType);
+ case SymbolicAddress::CosFdlibmD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::cos, *abiType);
+ case SymbolicAddress::TanNativeD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(tan, *abiType);
+ case SymbolicAddress::TanFdlibmD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::tan, *abiType);
+ case SymbolicAddress::ASinD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::asin, *abiType);
+ case SymbolicAddress::ACosD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::acos, *abiType);
+ case SymbolicAddress::ATanD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::atan, *abiType);
+ case SymbolicAddress::CeilD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::ceil, *abiType);
+ case SymbolicAddress::CeilF:
+ *abiType = Args_Float32_Float32;
+ return FuncCast<float(float)>(fdlibm::ceilf, *abiType);
+ case SymbolicAddress::FloorD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::floor, *abiType);
+ case SymbolicAddress::FloorF:
+ *abiType = Args_Float32_Float32;
+ return FuncCast<float(float)>(fdlibm::floorf, *abiType);
+ case SymbolicAddress::TruncD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::trunc, *abiType);
+ case SymbolicAddress::TruncF:
+ *abiType = Args_Float32_Float32;
+ return FuncCast<float(float)>(fdlibm::truncf, *abiType);
+ case SymbolicAddress::NearbyIntD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::nearbyint, *abiType);
+ case SymbolicAddress::NearbyIntF:
+ *abiType = Args_Float32_Float32;
+ return FuncCast<float(float)>(fdlibm::nearbyintf, *abiType);
+ case SymbolicAddress::ExpD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::exp, *abiType);
+ case SymbolicAddress::LogD:
+ *abiType = Args_Double_Double;
+ return FuncCast<double(double)>(fdlibm::log, *abiType);
+ case SymbolicAddress::PowD:
+ *abiType = Args_Double_DoubleDouble;
+ return FuncCast(ecmaPow, *abiType);
+ case SymbolicAddress::ATan2D:
+ *abiType = Args_Double_DoubleDouble;
+ return FuncCast(ecmaAtan2, *abiType);
+
+ case SymbolicAddress::MemoryGrowM32:
+ *abiType = Args_Int32_GeneralInt32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemoryGrowM32));
+ return FuncCast(Instance::memoryGrow_m32, *abiType);
+ case SymbolicAddress::MemoryGrowM64:
+ *abiType = Args_Int64_GeneralInt64;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemoryGrowM64));
+ return FuncCast(Instance::memoryGrow_m64, *abiType);
+ case SymbolicAddress::MemorySizeM32:
+ *abiType = Args_Int32_General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemorySizeM32));
+ return FuncCast(Instance::memorySize_m32, *abiType);
+ case SymbolicAddress::MemorySizeM64:
+ *abiType = Args_Int64_General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemorySizeM64));
+ return FuncCast(Instance::memorySize_m64, *abiType);
+ case SymbolicAddress::WaitI32M32:
+ *abiType = Args_Int32_GeneralInt32Int32Int64;
+ MOZ_ASSERT(*abiType == ToABIType(SASigWaitI32M32));
+ return FuncCast(Instance::wait_i32_m32, *abiType);
+ case SymbolicAddress::WaitI32M64:
+ *abiType = Args_Int32_GeneralInt64Int32Int64;
+ MOZ_ASSERT(*abiType == ToABIType(SASigWaitI32M64));
+ return FuncCast(Instance::wait_i32_m64, *abiType);
+ case SymbolicAddress::WaitI64M32:
+ *abiType = Args_Int32_GeneralInt32Int64Int64;
+ MOZ_ASSERT(*abiType == ToABIType(SASigWaitI64M32));
+ return FuncCast(Instance::wait_i64_m32, *abiType);
+ case SymbolicAddress::WaitI64M64:
+ *abiType = Args_Int32_GeneralInt64Int64Int64;
+ MOZ_ASSERT(*abiType == ToABIType(SASigWaitI64M64));
+ return FuncCast(Instance::wait_i64_m64, *abiType);
+ case SymbolicAddress::WakeM32:
+ *abiType = Args_Int32_GeneralInt32Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigWakeM32));
+ return FuncCast(Instance::wake_m32, *abiType);
+ case SymbolicAddress::WakeM64:
+ *abiType = Args_Int32_GeneralInt64Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigWakeM64));
+ return FuncCast(Instance::wake_m64, *abiType);
+ case SymbolicAddress::MemCopyM32:
+ *abiType = Args_Int32_GeneralInt32Int32Int32General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemCopyM32));
+ return FuncCast(Instance::memCopy_m32, *abiType);
+ case SymbolicAddress::MemCopySharedM32:
+ *abiType = Args_Int32_GeneralInt32Int32Int32General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemCopySharedM32));
+ return FuncCast(Instance::memCopyShared_m32, *abiType);
+ case SymbolicAddress::MemCopyM64:
+ *abiType = Args_Int32_GeneralInt64Int64Int64General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemCopyM64));
+ return FuncCast(Instance::memCopy_m64, *abiType);
+ case SymbolicAddress::MemCopySharedM64:
+ *abiType = Args_Int32_GeneralInt64Int64Int64General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemCopySharedM64));
+ return FuncCast(Instance::memCopyShared_m64, *abiType);
+ case SymbolicAddress::DataDrop:
+ *abiType = Args_Int32_GeneralInt32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigDataDrop));
+ return FuncCast(Instance::dataDrop, *abiType);
+ case SymbolicAddress::MemFillM32:
+ *abiType = Args_Int32_GeneralInt32Int32Int32General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemFillM32));
+ return FuncCast(Instance::memFill_m32, *abiType);
+ case SymbolicAddress::MemFillSharedM32:
+ *abiType = Args_Int32_GeneralInt32Int32Int32General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemFillSharedM32));
+ return FuncCast(Instance::memFillShared_m32, *abiType);
+ case SymbolicAddress::MemFillM64:
+ *abiType = Args_Int32_GeneralInt64Int32Int64General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemFillM64));
+ return FuncCast(Instance::memFill_m64, *abiType);
+ case SymbolicAddress::MemFillSharedM64:
+ *abiType = Args_Int32_GeneralInt64Int32Int64General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemFillSharedM64));
+ return FuncCast(Instance::memFillShared_m64, *abiType);
+ case SymbolicAddress::MemDiscardM32:
+ *abiType = Args_Int32_GeneralInt32Int32General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemDiscardM32));
+ return FuncCast(Instance::memDiscard_m32, *abiType);
+ case SymbolicAddress::MemDiscardSharedM32:
+ *abiType = Args_Int32_GeneralInt32Int32General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemDiscardSharedM32));
+ return FuncCast(Instance::memDiscardShared_m32, *abiType);
+ case SymbolicAddress::MemDiscardM64:
+ *abiType = Args_Int32_GeneralInt64Int64General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemDiscardM64));
+ return FuncCast(Instance::memDiscard_m64, *abiType);
+ case SymbolicAddress::MemDiscardSharedM64:
+ *abiType = Args_Int32_GeneralInt64Int64General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemDiscardSharedM64));
+ return FuncCast(Instance::memDiscardShared_m64, *abiType);
+ case SymbolicAddress::MemInitM32:
+ *abiType = Args_Int32_GeneralInt32Int32Int32Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemInitM32));
+ return FuncCast(Instance::memInit_m32, *abiType);
+ case SymbolicAddress::MemInitM64:
+ *abiType = Args_Int32_GeneralInt64Int32Int32Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigMemInitM64));
+ return FuncCast(Instance::memInit_m64, *abiType);
+ case SymbolicAddress::TableCopy:
+ *abiType = Args_Int32_GeneralInt32Int32Int32Int32Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigTableCopy));
+ return FuncCast(Instance::tableCopy, *abiType);
+ case SymbolicAddress::ElemDrop:
+ *abiType = Args_Int32_GeneralInt32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigElemDrop));
+ return FuncCast(Instance::elemDrop, *abiType);
+ case SymbolicAddress::TableFill:
+ *abiType = Args_Int32_GeneralInt32GeneralInt32Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigTableFill));
+ return FuncCast(Instance::tableFill, *abiType);
+ case SymbolicAddress::TableInit:
+ *abiType = Args_Int32_GeneralInt32Int32Int32Int32Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigTableInit));
+ return FuncCast(Instance::tableInit, *abiType);
+ case SymbolicAddress::TableGet:
+ *abiType = Args_General_GeneralInt32Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigTableGet));
+ return FuncCast(Instance::tableGet, *abiType);
+ case SymbolicAddress::TableGrow:
+ *abiType = Args_Int32_GeneralGeneralInt32Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigTableGrow));
+ return FuncCast(Instance::tableGrow, *abiType);
+ case SymbolicAddress::TableSet:
+ *abiType = Args_Int32_GeneralInt32GeneralInt32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigTableSet));
+ return FuncCast(Instance::tableSet, *abiType);
+ case SymbolicAddress::TableSize:
+ *abiType = Args_Int32_GeneralInt32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigTableSize));
+ return FuncCast(Instance::tableSize, *abiType);
+ case SymbolicAddress::RefFunc:
+ *abiType = Args_General_GeneralInt32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigRefFunc));
+ return FuncCast(Instance::refFunc, *abiType);
+ case SymbolicAddress::PostBarrier:
+ *abiType = Args_Int32_GeneralGeneral;
+ MOZ_ASSERT(*abiType == ToABIType(SASigPostBarrier));
+ return FuncCast(Instance::postBarrier, *abiType);
+ case SymbolicAddress::PostBarrierPrecise:
+ *abiType = Args_Int32_GeneralGeneralGeneral;
+ MOZ_ASSERT(*abiType == ToABIType(SASigPostBarrierPrecise));
+ return FuncCast(Instance::postBarrierPrecise, *abiType);
+ case SymbolicAddress::PostBarrierPreciseWithOffset:
+ *abiType = Args_Int32_GeneralGeneralInt32General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigPostBarrierPreciseWithOffset));
+ return FuncCast(Instance::postBarrierPreciseWithOffset, *abiType);
+ case SymbolicAddress::StructNew:
+ *abiType = Args_General2;
+ MOZ_ASSERT(*abiType == ToABIType(SASigStructNew));
+ return FuncCast(Instance::structNew, *abiType);
+ case SymbolicAddress::StructNewUninit:
+ *abiType = Args_General2;
+ MOZ_ASSERT(*abiType == ToABIType(SASigStructNewUninit));
+ return FuncCast(Instance::structNewUninit, *abiType);
+ case SymbolicAddress::ArrayNew:
+ *abiType = Args_General_GeneralInt32General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigArrayNew));
+ return FuncCast(Instance::arrayNew, *abiType);
+ case SymbolicAddress::ArrayNewUninit:
+ *abiType = Args_General_GeneralInt32General;
+ MOZ_ASSERT(*abiType == ToABIType(SASigArrayNewUninit));
+ return FuncCast(Instance::arrayNewUninit, *abiType);
+ case SymbolicAddress::ArrayNewData:
+ *abiType = Args_General_GeneralInt32Int32GeneralInt32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigArrayNewData));
+ return FuncCast(Instance::arrayNewData, *abiType);
+ case SymbolicAddress::ArrayNewElem:
+ *abiType = Args_General_GeneralInt32Int32GeneralInt32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigArrayNewElem));
+ return FuncCast(Instance::arrayNewElem, *abiType);
+ case SymbolicAddress::ArrayCopy:
+ *abiType = Args_Int32_GeneralGeneralInt32GeneralInt32Int32Int32;
+ MOZ_ASSERT(*abiType == ToABIType(SASigArrayCopy));
+ return FuncCast(Instance::arrayCopy, *abiType);
+
+ case SymbolicAddress::ExceptionNew:
+ *abiType = Args_General2;
+ MOZ_ASSERT(*abiType == ToABIType(SASigExceptionNew));
+ return FuncCast(Instance::exceptionNew, *abiType);
+ case SymbolicAddress::ThrowException:
+ *abiType = Args_Int32_GeneralGeneral;
+ MOZ_ASSERT(*abiType == ToABIType(SASigThrowException));
+ return FuncCast(Instance::throwException, *abiType);
+
+#ifdef WASM_CODEGEN_DEBUG
+ case SymbolicAddress::PrintI32:
+ *abiType = Args_General1;
+ return FuncCast(PrintI32, *abiType);
+ case SymbolicAddress::PrintPtr:
+ *abiType = Args_General1;
+ return FuncCast(PrintPtr, *abiType);
+ case SymbolicAddress::PrintF32:
+ *abiType = Args_Int_Float32;
+ return FuncCast(PrintF32, *abiType);
+ case SymbolicAddress::PrintF64:
+ *abiType = Args_Int_Double;
+ return FuncCast(PrintF64, *abiType);
+ case SymbolicAddress::PrintText:
+ *abiType = Args_General1;
+ return FuncCast(PrintText, *abiType);
+#endif
+#define DECL_SAS_TYPE_AND_FN(op, export, sa_name, abitype, entry, idx) \
+ case SymbolicAddress::sa_name: \
+ *abiType = abitype; \
+ return FuncCast(entry, *abiType);
+ FOR_EACH_INTRINSIC(DECL_SAS_TYPE_AND_FN)
+#undef DECL_SAS_TYPE_AND_FN
+ case SymbolicAddress::Limit:
+ break;
+ }
+
+ MOZ_CRASH("Bad SymbolicAddress");
+}
+
+bool wasm::IsRoundingFunction(SymbolicAddress callee, jit::RoundingMode* mode) {
+ switch (callee) {
+ case SymbolicAddress::FloorD:
+ case SymbolicAddress::FloorF:
+ *mode = jit::RoundingMode::Down;
+ return true;
+ case SymbolicAddress::CeilD:
+ case SymbolicAddress::CeilF:
+ *mode = jit::RoundingMode::Up;
+ return true;
+ case SymbolicAddress::TruncD:
+ case SymbolicAddress::TruncF:
+ *mode = jit::RoundingMode::TowardsZero;
+ return true;
+ case SymbolicAddress::NearbyIntD:
+ case SymbolicAddress::NearbyIntF:
+ *mode = jit::RoundingMode::NearestTiesToEven;
+ return true;
+ default:
+ return false;
+ }
+}
+
+bool wasm::NeedsBuiltinThunk(SymbolicAddress sym) {
+ // Also see "The Wasm Builtin ABIs" in WasmFrame.h.
+ switch (sym) {
+ // No thunk, because they do their work within the activation
+ case SymbolicAddress::HandleThrow: // GenerateThrowStub
+ case SymbolicAddress::HandleTrap: // GenerateTrapExit
+ return false;
+
+ // No thunk, because some work has to be done within the activation before
+ // the activation exit: when called, arbitrary wasm registers are live and
+ // must be saved, and the stack pointer may not be aligned for any ABI.
+ case SymbolicAddress::HandleDebugTrap: // GenerateDebugTrapStub
+
+ // No thunk, because their caller manages the activation exit explicitly
+ case SymbolicAddress::CallImport_General: // GenerateImportInterpExit
+ case SymbolicAddress::CoerceInPlace_ToInt32: // GenerateImportJitExit
+ case SymbolicAddress::CoerceInPlace_ToNumber: // GenerateImportJitExit
+ case SymbolicAddress::CoerceInPlace_ToBigInt: // GenerateImportJitExit
+ case SymbolicAddress::BoxValue_Anyref: // GenerateImportJitExit
+ return false;
+
+#ifdef WASM_CODEGEN_DEBUG
+ // No thunk, because they call directly into C++ code that does not interact
+ // with the rest of the VM at all.
+ case SymbolicAddress::PrintI32: // Debug stub printers
+ case SymbolicAddress::PrintPtr:
+ case SymbolicAddress::PrintF32:
+ case SymbolicAddress::PrintF64:
+ case SymbolicAddress::PrintText:
+ return false;
+#endif
+
+ // Everyone else gets a thunk to handle the exit from the activation
+ case SymbolicAddress::ToInt32:
+ case SymbolicAddress::DivI64:
+ case SymbolicAddress::UDivI64:
+ case SymbolicAddress::ModI64:
+ case SymbolicAddress::UModI64:
+ case SymbolicAddress::TruncateDoubleToUint64:
+ case SymbolicAddress::TruncateDoubleToInt64:
+ case SymbolicAddress::SaturatingTruncateDoubleToUint64:
+ case SymbolicAddress::SaturatingTruncateDoubleToInt64:
+ case SymbolicAddress::Uint64ToDouble:
+ case SymbolicAddress::Uint64ToFloat32:
+ case SymbolicAddress::Int64ToDouble:
+ case SymbolicAddress::Int64ToFloat32:
+#if defined(JS_CODEGEN_ARM)
+ case SymbolicAddress::aeabi_idivmod:
+ case SymbolicAddress::aeabi_uidivmod:
+#endif
+ case SymbolicAddress::AllocateBigInt:
+ case SymbolicAddress::ModD:
+ case SymbolicAddress::SinNativeD:
+ case SymbolicAddress::SinFdlibmD:
+ case SymbolicAddress::CosNativeD:
+ case SymbolicAddress::CosFdlibmD:
+ case SymbolicAddress::TanNativeD:
+ case SymbolicAddress::TanFdlibmD:
+ case SymbolicAddress::ASinD:
+ case SymbolicAddress::ACosD:
+ case SymbolicAddress::ATanD:
+ case SymbolicAddress::CeilD:
+ case SymbolicAddress::CeilF:
+ case SymbolicAddress::FloorD:
+ case SymbolicAddress::FloorF:
+ case SymbolicAddress::TruncD:
+ case SymbolicAddress::TruncF:
+ case SymbolicAddress::NearbyIntD:
+ case SymbolicAddress::NearbyIntF:
+ case SymbolicAddress::ExpD:
+ case SymbolicAddress::LogD:
+ case SymbolicAddress::PowD:
+ case SymbolicAddress::ATan2D:
+ case SymbolicAddress::MemoryGrowM32:
+ case SymbolicAddress::MemoryGrowM64:
+ case SymbolicAddress::MemorySizeM32:
+ case SymbolicAddress::MemorySizeM64:
+ case SymbolicAddress::WaitI32M32:
+ case SymbolicAddress::WaitI32M64:
+ case SymbolicAddress::WaitI64M32:
+ case SymbolicAddress::WaitI64M64:
+ case SymbolicAddress::WakeM32:
+ case SymbolicAddress::WakeM64:
+ case SymbolicAddress::CoerceInPlace_JitEntry:
+ case SymbolicAddress::ReportV128JSCall:
+ case SymbolicAddress::MemCopyM32:
+ case SymbolicAddress::MemCopySharedM32:
+ case SymbolicAddress::MemCopyM64:
+ case SymbolicAddress::MemCopySharedM64:
+ case SymbolicAddress::DataDrop:
+ case SymbolicAddress::MemFillM32:
+ case SymbolicAddress::MemFillSharedM32:
+ case SymbolicAddress::MemFillM64:
+ case SymbolicAddress::MemFillSharedM64:
+ case SymbolicAddress::MemDiscardM32:
+ case SymbolicAddress::MemDiscardSharedM32:
+ case SymbolicAddress::MemDiscardM64:
+ case SymbolicAddress::MemDiscardSharedM64:
+ case SymbolicAddress::MemInitM32:
+ case SymbolicAddress::MemInitM64:
+ case SymbolicAddress::TableCopy:
+ case SymbolicAddress::ElemDrop:
+ case SymbolicAddress::TableFill:
+ case SymbolicAddress::TableGet:
+ case SymbolicAddress::TableGrow:
+ case SymbolicAddress::TableInit:
+ case SymbolicAddress::TableSet:
+ case SymbolicAddress::TableSize:
+ case SymbolicAddress::RefFunc:
+ case SymbolicAddress::PostBarrier:
+ case SymbolicAddress::PostBarrierPrecise:
+ case SymbolicAddress::PostBarrierPreciseWithOffset:
+ case SymbolicAddress::ExceptionNew:
+ case SymbolicAddress::ThrowException:
+ case SymbolicAddress::StructNew:
+ case SymbolicAddress::StructNewUninit:
+ case SymbolicAddress::ArrayNew:
+ case SymbolicAddress::ArrayNewUninit:
+ case SymbolicAddress::ArrayNewData:
+ case SymbolicAddress::ArrayNewElem:
+ case SymbolicAddress::ArrayCopy:
+#define OP(op, export, sa_name, abitype, entry, idx) \
+ case SymbolicAddress::sa_name:
+ FOR_EACH_INTRINSIC(OP)
+#undef OP
+ return true;
+
+ case SymbolicAddress::Limit:
+ break;
+ }
+
+ MOZ_CRASH("unexpected symbolic address");
+}
+
+// ============================================================================
+// [SMDOC] JS Fast Wasm Imports
+//
+// JS builtins that can be imported by wasm modules and called efficiently
+// through thunks. These thunks conform to the internal wasm ABI and thus can be
+// patched in for import calls. Calling a JS builtin through a thunk is much
+// faster than calling out through the generic import call trampoline which will
+// end up in the slowest C++ Instance::callImport path.
+//
+// Each JS builtin can have several overloads. These must all be enumerated in
+// PopulateTypedNatives() so they can be included in the process-wide thunk set.
+// Additionally to the traditional overloading based on types, every builtin
+// can also have a version implemented by fdlibm or the native math library.
+// This is useful for fingerprinting resistance.
+
+#define FOR_EACH_SIN_COS_TAN_NATIVE(_) \
+ _(math_sin, MathSin) \
+ _(math_tan, MathTan) \
+ _(math_cos, MathCos)
+
+#define FOR_EACH_UNARY_NATIVE(_) \
+ _(math_exp, MathExp) \
+ _(math_log, MathLog) \
+ _(math_asin, MathASin) \
+ _(math_atan, MathATan) \
+ _(math_acos, MathACos) \
+ _(math_log10, MathLog10) \
+ _(math_log2, MathLog2) \
+ _(math_log1p, MathLog1P) \
+ _(math_expm1, MathExpM1) \
+ _(math_sinh, MathSinH) \
+ _(math_tanh, MathTanH) \
+ _(math_cosh, MathCosH) \
+ _(math_asinh, MathASinH) \
+ _(math_atanh, MathATanH) \
+ _(math_acosh, MathACosH) \
+ _(math_sign, MathSign) \
+ _(math_trunc, MathTrunc) \
+ _(math_cbrt, MathCbrt)
+
+#define FOR_EACH_BINARY_NATIVE(_) \
+ _(ecmaAtan2, MathATan2) \
+ _(ecmaHypot, MathHypot) \
+ _(ecmaPow, MathPow)
+
+#define DEFINE_SIN_COS_TAN_FLOAT_WRAPPER(func, _) \
+ static float func##_native_impl_f32(float x) { \
+ return float(func##_native_impl(double(x))); \
+ } \
+ static float func##_fdlibm_impl_f32(float x) { \
+ return float(func##_fdlibm_impl(double(x))); \
+ }
+
+#define DEFINE_UNARY_FLOAT_WRAPPER(func, _) \
+ static float func##_impl_f32(float x) { \
+ return float(func##_impl(double(x))); \
+ }
+
+#define DEFINE_BINARY_FLOAT_WRAPPER(func, _) \
+ static float func##_f32(float x, float y) { \
+ return float(func(double(x), double(y))); \
+ }
+
+FOR_EACH_SIN_COS_TAN_NATIVE(DEFINE_SIN_COS_TAN_FLOAT_WRAPPER)
+FOR_EACH_UNARY_NATIVE(DEFINE_UNARY_FLOAT_WRAPPER)
+FOR_EACH_BINARY_NATIVE(DEFINE_BINARY_FLOAT_WRAPPER)
+
+#undef DEFINE_UNARY_FLOAT_WRAPPER
+#undef DEFINE_BINARY_FLOAT_WRAPPER
+
+struct TypedNative {
+ InlinableNative native;
+ ABIFunctionType abiType;
+ enum class FdlibmImpl : uint8_t { No, Yes } fdlibm;
+
+ TypedNative(InlinableNative native, ABIFunctionType abiType,
+ FdlibmImpl fdlibm)
+ : native(native), abiType(abiType), fdlibm(fdlibm) {}
+
+ using Lookup = TypedNative;
+ static HashNumber hash(const Lookup& l) {
+ return HashGeneric(uint32_t(l.native), uint32_t(l.abiType),
+ uint32_t(l.fdlibm));
+ }
+ static bool match(const TypedNative& lhs, const Lookup& rhs) {
+ return lhs.native == rhs.native && lhs.abiType == rhs.abiType &&
+ lhs.fdlibm == rhs.fdlibm;
+ }
+};
+
+using TypedNativeToFuncPtrMap =
+ HashMap<TypedNative, void*, TypedNative, SystemAllocPolicy>;
+
+static bool PopulateTypedNatives(TypedNativeToFuncPtrMap* typedNatives) {
+#define ADD_OVERLOAD(funcName, native, abiType, fdlibm) \
+ if (!typedNatives->putNew(TypedNative(InlinableNative::native, abiType, \
+ TypedNative::FdlibmImpl::fdlibm), \
+ FuncCast(funcName, abiType))) \
+ return false;
+
+#define ADD_SIN_COS_TAN_OVERLOADS(funcName, native) \
+ ADD_OVERLOAD(funcName##_native_impl, native, Args_Double_Double, No) \
+ ADD_OVERLOAD(funcName##_fdlibm_impl, native, Args_Double_Double, Yes) \
+ ADD_OVERLOAD(funcName##_native_impl_f32, native, Args_Float32_Float32, No) \
+ ADD_OVERLOAD(funcName##_fdlibm_impl_f32, native, Args_Float32_Float32, Yes)
+
+#define ADD_UNARY_OVERLOADS(funcName, native) \
+ ADD_OVERLOAD(funcName##_impl, native, Args_Double_Double, No) \
+ ADD_OVERLOAD(funcName##_impl_f32, native, Args_Float32_Float32, No)
+
+#define ADD_BINARY_OVERLOADS(funcName, native) \
+ ADD_OVERLOAD(funcName, native, Args_Double_DoubleDouble, No) \
+ ADD_OVERLOAD(funcName##_f32, native, Args_Float32_Float32Float32, No)
+
+ FOR_EACH_SIN_COS_TAN_NATIVE(ADD_SIN_COS_TAN_OVERLOADS)
+ FOR_EACH_UNARY_NATIVE(ADD_UNARY_OVERLOADS)
+ FOR_EACH_BINARY_NATIVE(ADD_BINARY_OVERLOADS)
+
+#undef ADD_UNARY_OVERLOADS
+#undef ADD_BINARY_OVERLOADS
+
+ return true;
+}
+
+#undef FOR_EACH_UNARY_NATIVE
+#undef FOR_EACH_BINARY_NATIVE
+
+// ============================================================================
+// [SMDOC] Process-wide builtin thunk set
+//
+// Thunks are inserted between wasm calls and the C++ callee and achieve two
+// things:
+// - bridging the few differences between the internal wasm ABI and the
+// external native ABI (viz. float returns on x86 and soft-fp ARM)
+// - executing an exit prologue/epilogue which in turn allows any profiling
+// iterator to see the full stack up to the wasm operation that called out
+//
+// Thunks are created for two kinds of C++ callees, enumerated above:
+// - SymbolicAddress: for statically compiled calls in the wasm module
+// - Imported JS builtins: optimized calls to imports
+//
+// All thunks are created up front, lazily, when the first wasm module is
+// compiled in the process. Thunks are kept alive until the JS engine shuts down
+// in the process. No thunks are created at runtime after initialization. This
+// simple scheme allows several simplifications:
+// - no reference counting to keep thunks alive
+// - no problems toggling W^X permissions which, because of multiple executing
+// threads, would require each thunk allocation to be on its own page
+// The cost for creating all thunks at once is relatively low since all thunks
+// fit within the smallest executable-code allocation quantum (64k).
+
+using TypedNativeToCodeRangeMap =
+ HashMap<TypedNative, uint32_t, TypedNative, SystemAllocPolicy>;
+
+using SymbolicAddressToCodeRangeArray =
+ EnumeratedArray<SymbolicAddress, SymbolicAddress::Limit, uint32_t>;
+
+struct BuiltinThunks {
+ uint8_t* codeBase;
+ size_t codeSize;
+ CodeRangeVector codeRanges;
+ TypedNativeToCodeRangeMap typedNativeToCodeRange;
+ SymbolicAddressToCodeRangeArray symbolicAddressToCodeRange;
+ uint32_t provisionalLazyJitEntryOffset;
+
+ BuiltinThunks() : codeBase(nullptr), codeSize(0) {}
+
+ ~BuiltinThunks() {
+ if (codeBase) {
+ DeallocateExecutableMemory(codeBase, codeSize);
+ }
+ }
+};
+
+Mutex initBuiltinThunks(mutexid::WasmInitBuiltinThunks);
+Atomic<const BuiltinThunks*> builtinThunks;
+
+bool wasm::EnsureBuiltinThunksInitialized() {
+ LockGuard<Mutex> guard(initBuiltinThunks);
+ if (builtinThunks) {
+ return true;
+ }
+
+ auto thunks = MakeUnique<BuiltinThunks>();
+ if (!thunks) {
+ return false;
+ }
+
+ LifoAlloc lifo(BUILTIN_THUNK_LIFO_SIZE);
+ TempAllocator tempAlloc(&lifo);
+ WasmMacroAssembler masm(tempAlloc);
+ AutoCreatedBy acb(masm, "wasm::EnsureBuiltinThunksInitialized");
+
+ for (auto sym : MakeEnumeratedRange(SymbolicAddress::Limit)) {
+ if (!NeedsBuiltinThunk(sym)) {
+ thunks->symbolicAddressToCodeRange[sym] = UINT32_MAX;
+ continue;
+ }
+
+ uint32_t codeRangeIndex = thunks->codeRanges.length();
+ thunks->symbolicAddressToCodeRange[sym] = codeRangeIndex;
+
+ ABIFunctionType abiType;
+ void* funcPtr = AddressOf(sym, &abiType);
+
+ ExitReason exitReason(sym);
+
+ CallableOffsets offsets;
+ if (!GenerateBuiltinThunk(masm, abiType, exitReason, funcPtr, &offsets)) {
+ return false;
+ }
+ if (!thunks->codeRanges.emplaceBack(CodeRange::BuiltinThunk, offsets)) {
+ return false;
+ }
+ }
+
+ TypedNativeToFuncPtrMap typedNatives;
+ if (!PopulateTypedNatives(&typedNatives)) {
+ return false;
+ }
+
+ for (TypedNativeToFuncPtrMap::Range r = typedNatives.all(); !r.empty();
+ r.popFront()) {
+ TypedNative typedNative = r.front().key();
+
+ uint32_t codeRangeIndex = thunks->codeRanges.length();
+ if (!thunks->typedNativeToCodeRange.putNew(typedNative, codeRangeIndex)) {
+ return false;
+ }
+
+ ABIFunctionType abiType = typedNative.abiType;
+ void* funcPtr = r.front().value();
+
+ ExitReason exitReason = ExitReason::Fixed::BuiltinNative;
+
+ CallableOffsets offsets;
+ if (!GenerateBuiltinThunk(masm, abiType, exitReason, funcPtr, &offsets)) {
+ return false;
+ }
+ if (!thunks->codeRanges.emplaceBack(CodeRange::BuiltinThunk, offsets)) {
+ return false;
+ }
+ }
+
+ // Provisional lazy JitEntry stub: This is a shared stub that can be installed
+ // in the jit-entry jump table. It uses the JIT ABI and when invoked will
+ // retrieve (via TlsContext()) and invoke the context-appropriate
+ // invoke-from-interpreter jit stub, thus serving as the initial, unoptimized
+ // jit-entry stub for any exported wasm function that has a jit-entry.
+
+#ifdef DEBUG
+ // We need to allow this machine code to bake in a C++ code pointer, so we
+ // disable the wasm restrictions while generating this stub.
+ JitContext jitContext;
+ bool oldFlag = jitContext.setIsCompilingWasm(false);
+#endif
+
+ Offsets provisionalLazyJitEntryOffsets;
+ if (!GenerateProvisionalLazyJitEntryStub(masm,
+ &provisionalLazyJitEntryOffsets)) {
+ return false;
+ }
+ thunks->provisionalLazyJitEntryOffset = provisionalLazyJitEntryOffsets.begin;
+
+#ifdef DEBUG
+ jitContext.setIsCompilingWasm(oldFlag);
+#endif
+
+ masm.finish();
+ if (masm.oom()) {
+ return false;
+ }
+
+ size_t allocSize = AlignBytes(masm.bytesNeeded(), ExecutableCodePageSize);
+
+ thunks->codeSize = allocSize;
+ thunks->codeBase = (uint8_t*)AllocateExecutableMemory(
+ allocSize, ProtectionSetting::Writable, MemCheckKind::MakeUndefined);
+ if (!thunks->codeBase) {
+ return false;
+ }
+
+ masm.executableCopy(thunks->codeBase);
+ memset(thunks->codeBase + masm.bytesNeeded(), 0,
+ allocSize - masm.bytesNeeded());
+
+ masm.processCodeLabels(thunks->codeBase);
+ PatchDebugSymbolicAccesses(thunks->codeBase, masm);
+
+ MOZ_ASSERT(masm.callSites().empty());
+ MOZ_ASSERT(masm.callSiteTargets().empty());
+ MOZ_ASSERT(masm.trapSites().empty());
+ MOZ_ASSERT(masm.tryNotes().empty());
+
+ if (!ExecutableAllocator::makeExecutableAndFlushICache(thunks->codeBase,
+ thunks->codeSize)) {
+ return false;
+ }
+
+ builtinThunks = thunks.release();
+ return true;
+}
+
+void wasm::ReleaseBuiltinThunks() {
+ if (builtinThunks) {
+ const BuiltinThunks* ptr = builtinThunks;
+ js_delete(const_cast<BuiltinThunks*>(ptr));
+ builtinThunks = nullptr;
+ }
+}
+
+void* wasm::SymbolicAddressTarget(SymbolicAddress sym) {
+ MOZ_ASSERT(builtinThunks);
+
+ ABIFunctionType abiType;
+ void* funcPtr = AddressOf(sym, &abiType);
+
+ if (!NeedsBuiltinThunk(sym)) {
+ return funcPtr;
+ }
+
+ const BuiltinThunks& thunks = *builtinThunks;
+ uint32_t codeRangeIndex = thunks.symbolicAddressToCodeRange[sym];
+ return thunks.codeBase + thunks.codeRanges[codeRangeIndex].begin();
+}
+
+void* wasm::ProvisionalLazyJitEntryStub() {
+ MOZ_ASSERT(builtinThunks);
+
+ const BuiltinThunks& thunks = *builtinThunks;
+ return thunks.codeBase + thunks.provisionalLazyJitEntryOffset;
+}
+
+static Maybe<ABIFunctionType> ToBuiltinABIFunctionType(
+ const FuncType& funcType) {
+ const ValTypeVector& args = funcType.args();
+ const ValTypeVector& results = funcType.results();
+
+ if (results.length() != 1) {
+ return Nothing();
+ }
+
+ uint32_t abiType;
+ switch (results[0].kind()) {
+ case ValType::F32:
+ abiType = ArgType_Float32 << RetType_Shift;
+ break;
+ case ValType::F64:
+ abiType = ArgType_Float64 << RetType_Shift;
+ break;
+ default:
+ return Nothing();
+ }
+
+ if ((args.length() + 1) > (sizeof(uint32_t) * 8 / ArgType_Shift)) {
+ return Nothing();
+ }
+
+ for (size_t i = 0; i < args.length(); i++) {
+ switch (args[i].kind()) {
+ case ValType::F32:
+ abiType |= (ArgType_Float32 << (ArgType_Shift * (i + 1)));
+ break;
+ case ValType::F64:
+ abiType |= (ArgType_Float64 << (ArgType_Shift * (i + 1)));
+ break;
+ default:
+ return Nothing();
+ }
+ }
+
+ return Some(ABIFunctionType(abiType));
+}
+
+void* wasm::MaybeGetBuiltinThunk(JSFunction* f, const FuncType& funcType) {
+ MOZ_ASSERT(builtinThunks);
+
+ if (!f->isNativeFun() || !f->hasJitInfo() ||
+ f->jitInfo()->type() != JSJitInfo::InlinableNative) {
+ return nullptr;
+ }
+
+ Maybe<ABIFunctionType> abiType = ToBuiltinABIFunctionType(funcType);
+ if (!abiType) {
+ return nullptr;
+ }
+
+ const BuiltinThunks& thunks = *builtinThunks;
+
+ // If this function should resist fingerprinting first try to lookup
+ // the fdlibm version. If that version doesn't exist we still fallback to
+ // the normal native.
+ if (math_use_fdlibm_for_sin_cos_tan() ||
+ f->realm()->behaviors().shouldResistFingerprinting()) {
+ TypedNative typedNative(f->jitInfo()->inlinableNative, *abiType,
+ TypedNative::FdlibmImpl::Yes);
+ auto p =
+ thunks.typedNativeToCodeRange.readonlyThreadsafeLookup(typedNative);
+ if (p) {
+ return thunks.codeBase + thunks.codeRanges[p->value()].begin();
+ }
+ }
+
+ TypedNative typedNative(f->jitInfo()->inlinableNative, *abiType,
+ TypedNative::FdlibmImpl::No);
+ auto p = thunks.typedNativeToCodeRange.readonlyThreadsafeLookup(typedNative);
+ if (!p) {
+ return nullptr;
+ }
+
+ return thunks.codeBase + thunks.codeRanges[p->value()].begin();
+}
+
+bool wasm::LookupBuiltinThunk(void* pc, const CodeRange** codeRange,
+ uint8_t** codeBase) {
+ if (!builtinThunks) {
+ return false;
+ }
+
+ const BuiltinThunks& thunks = *builtinThunks;
+ if (pc < thunks.codeBase || pc >= thunks.codeBase + thunks.codeSize) {
+ return false;
+ }
+
+ *codeBase = thunks.codeBase;
+
+ CodeRange::OffsetInCode target((uint8_t*)pc - thunks.codeBase);
+ *codeRange = LookupInSorted(thunks.codeRanges, target);
+
+ return !!*codeRange;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 12:55:59 +0000