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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef jit_Ion_h
#define jit_Ion_h
#include "mozilla/MemoryReporting.h"
#include "jscntxt.h"
#include "jscompartment.h"
#include "jit/CompileWrappers.h"
#include "jit/JitOptions.h"
#include "cobalt/configuration/configuration.h"
namespace js {
namespace jit {
class TempAllocator;
enum MethodStatus
enum AbortReason {
// A JIT context is needed to enter into either an JIT method or an instance
// of a JIT compiler. It points to a temporary allocator and the active
// JSContext, either of which may be nullptr, and the active compartment, which
// will not be nullptr.
class JitContext
JitContext(JSContext* cx, TempAllocator* temp);
JitContext(ExclusiveContext* cx, TempAllocator* temp);
JitContext(CompileRuntime* rt, CompileCompartment* comp, TempAllocator* temp);
explicit JitContext(CompileRuntime* rt);
JitContext(CompileRuntime* rt, TempAllocator* temp);
// Running context when executing on the main thread. Not available during
// compilation.
JSContext* cx;
// Allocator for temporary memory during compilation.
TempAllocator* temp;
// Wrappers with information about the current runtime/compartment for use
// during compilation.
CompileRuntime* runtime;
CompileCompartment* compartment;
int getNextAssemblerId() {
return assemblerCount_++;
JitContext* prev_;
int assemblerCount_;
// Initialize Ion statically for all JSRuntimes.
bool InitializeIon();
// Get and set the current JIT context.
JitContext* GetJitContext();
JitContext* MaybeGetJitContext();
void SetJitContext(JitContext* ctx);
bool CanIonCompileScript(JSContext* cx, JSScript* script, bool osr);
MethodStatus CanEnterAtBranch(JSContext* cx, HandleScript script,
BaselineFrame* frame, jsbytecode* pc);
MethodStatus CanEnter(JSContext* cx, RunState& state);
MethodStatus CompileFunctionForBaseline(JSContext* cx, HandleScript script, BaselineFrame* frame);
MethodStatus CanEnterUsingFastInvoke(JSContext* cx, HandleScript script, uint32_t numActualArgs);
Recompile(JSContext* cx, HandleScript script, BaselineFrame* osrFrame, jsbytecode* osrPc,
bool constructing, bool force);
enum JitExecStatus
// The method call had to be aborted due to a stack limit check. This
// error indicates that Ion never attempted to clean up frames.
// The method call resulted in an error, and IonMonkey has cleaned up
// frames.
// The method call succeeded and returned a value.
static inline bool
IsErrorStatus(JitExecStatus status)
return status == JitExec_Error || status == JitExec_Aborted;
struct EnterJitData;
bool SetEnterJitData(JSContext* cx, EnterJitData& data, RunState& state, AutoValueVector& vals);
JitExecStatus IonCannon(JSContext* cx, RunState& state);
// Used to enter Ion from C++ natives like Called from FastInvokeGuard.
JitExecStatus FastInvoke(JSContext* cx, HandleFunction fun, CallArgs& args);
// Walk the stack and invalidate active Ion frames for the invalid scripts.
void Invalidate(TypeZone& types, FreeOp* fop,
const RecompileInfoVector& invalid, bool resetUses = true,
bool cancelOffThread = true);
void Invalidate(JSContext* cx, const RecompileInfoVector& invalid, bool resetUses = true,
bool cancelOffThread = true);
bool Invalidate(JSContext* cx, JSScript* script, bool resetUses = true,
bool cancelOffThread = true);
void ToggleBarriers(JS::Zone* zone, bool needs);
class IonBuilder;
class MIRGenerator;
class LIRGraph;
class CodeGenerator;
bool OptimizeMIR(MIRGenerator* mir);
LIRGraph* GenerateLIR(MIRGenerator* mir);
CodeGenerator* GenerateCode(MIRGenerator* mir, LIRGraph* lir);
CodeGenerator* CompileBackEnd(MIRGenerator* mir);
void AttachFinishedCompilations(JSContext* cx);
void FinishOffThreadBuilder(JSContext* cx, IonBuilder* builder);
void StopAllOffThreadCompilations(Zone* zone);
void StopAllOffThreadCompilations(JSCompartment* comp);
void LazyLink(JSContext* cx, HandleScript calleescript);
uint8_t* LazyLinkTopActivation(JSContext* cx);
static inline bool
IsIonEnabled(JSContext* cx)
// The ARM64 Ion engine is not yet implemented.
#if defined(JS_CODEGEN_NONE) || defined(JS_CODEGEN_ARM64)
return false;
if (cobalt::configuration::Configuration::GetInstance()->CobaltEnableJit()) {
return cx->runtime()->options().ion() &&
cx->runtime()->options().baseline() &&
} else {
return false;
inline bool
IsIonInlinablePC(jsbytecode* pc) {
// CALL, FUNCALL, FUNAPPLY, EVAL, NEW (Normal Callsites)
// GETPROP, CALLPROP, and LENGTH. (Inlined Getters)
return IsCallPC(pc) || IsGetPropPC(pc) || IsSetPropPC(pc);
inline bool
TooManyActualArguments(unsigned nargs)
return nargs > JitOptions.maxStackArgs;
inline bool
TooManyFormalArguments(unsigned nargs)
return nargs >= SNAPSHOT_MAX_NARGS || TooManyActualArguments(nargs);
inline size_t
NumLocalsAndArgs(JSScript* script)
size_t num = 1 /* this */ + script->nfixed();
if (JSFunction* fun = script->functionNonDelazifying())
num += fun->nargs();
return num;
bool OffThreadCompilationAvailable(JSContext* cx);
void ForbidCompilation(JSContext* cx, JSScript* script);
void PurgeCaches(JSScript* script);
size_t SizeOfIonData(JSScript* script, mozilla::MallocSizeOf mallocSizeOf);
void DestroyJitScripts(FreeOp* fop, JSScript* script);
void TraceJitScripts(JSTracer* trc, JSScript* script);
bool JitSupportsFloatingPoint();
bool JitSupportsSimd();
bool JitSupportsAtomics();
} // namespace jit
} // namespace js
#endif /* jit_Ion_h */