C++ JSContext::typeInferenceEnabled方法代码示例

static inline bool
UncachedInlineCall(VMFrame &f, InitialFrameFlags initial,
                   void **pret, bool *unjittable, uint32_t argc)
{
    AssertCanGC();
    JSContext *cx = f.cx;
    CallArgs args = CallArgsFromSp(argc, f.regs.sp);
    RootedFunction newfun(cx, args.callee().toFunction());

    RootedScript newscript(cx, newfun->getOrCreateScript(cx));
    if (!newscript)
        return false;

    bool construct = InitialFrameFlagsAreConstructing(initial);

    RootedScript fscript(cx, f.script());
    bool newType = construct && cx->typeInferenceEnabled() &&
        types::UseNewType(cx, fscript, f.pc());

    if (!types::TypeMonitorCall(cx, args, construct))
        return false;

    /* Try to compile if not already compiled. */
    if (ShouldJaegerCompileCallee(cx, f.script(), newscript, f.jit())) {
        CompileStatus status = CanMethodJIT(cx, newscript, newscript->code, construct,
                                            CompileRequest_JIT, f.fp());
        if (status == Compile_Error) {
            /* A runtime exception was thrown, get out. */
            return false;
        }
        if (status == Compile_Abort)
            *unjittable = true;
    }

    /*
     * Make sure we are not calling from an inline frame if we need to make a
     * call object for the callee, as doing so could trigger GC and cause
     * jitcode discarding / frame expansion.
     */
    if (f.regs.inlined() && newfun->isHeavyweight()) {
        ExpandInlineFrames(cx->compartment);
        JS_ASSERT(!f.regs.inlined());
    }

    /*
     * Preserve f.regs.fp while pushing the new frame, for the invariant that
     * f.regs reflects the state when we entered the stub call. This handoff is
     * tricky: we need to make sure that f.regs is not updated to the new
     * frame, and we also need to ensure that cx->regs still points to f.regs
     * when space is reserved, in case doing so throws an exception.
     */
    FrameRegs regs = f.regs;

    /* Get pointer to new frame/slots, prepare arguments. */
    if (!cx->stack.pushInlineFrame(cx, regs, args, *newfun, newscript, initial, &f.stackLimit))
        return false;

    /* Finish the handoff to the new frame regs. */
    PreserveRegsGuard regsGuard(cx, regs);

    /*
     * If newscript was successfully compiled, run it. Skip for calls which
     * will be constructing a new type object for 'this'.
     */
    if (!newType) {
        if (JITScript *jit = newscript->getJIT(regs.fp()->isConstructing(), cx->compartment->compileBarriers())) {
            if (jit->invokeEntry) {
                *pret = jit->invokeEntry;

                /* Restore the old fp around and let the JIT code repush the new fp. */
                regs.popFrame((Value *) regs.fp());
                return true;
            }
        }
    }

    /*
     * Otherwise, run newscript in the interpreter. Expand any inlined frame we
     * are calling from, as the new frame is not associated with the VMFrame
     * and will not have its prevpc info updated if frame expansion is
     * triggered while interpreting.
     */
    if (f.regs.inlined()) {
        ExpandInlineFrames(cx->compartment);
        JS_ASSERT(!f.regs.inlined());
        regs.fp()->resetInlinePrev(f.fp(), f.regs.pc);
    }

    JS_CHECK_RECURSION(cx, return false);

    RootedScript script(cx, newscript);
    bool ok = RunScript(cx, script, cx->fp());
    f.cx->stack.popInlineFrame(regs);

    if (ok) {
        RootedScript fscript(cx, f.script());
        types::TypeScript::Monitor(f.cx, fscript, f.pc(), args.rval());
    }

    *pret = NULL;
//.........这里部分代码省略.........