C++ LLVMState::shared方法代码示例

    virtual void perform() {
      for(;;) { // forever

        BackgroundCompileRequest* req = 0;

        // Lock, wait, get a request, unlock
        {
          thread::Mutex::LockGuard guard(mutex_);

          if(pause_) {
            state = cPaused;

            paused_ = true;
            pause_condition_.signal();

            while(pause_) {
              condition_.wait(mutex_);
            }

            state = cUnknown;
            paused_ = false;
          }

          // If we've been asked to stop, do so now.
          if(stop_) return;

          while(pending_requests_.size() == 0) {
            state = cIdle;

            // unlock and wait...
            condition_.wait(mutex_);

            if(stop_) return;
          }

          // now locked again, shift a request
          req = pending_requests_.front();
          pending_requests_.pop_front();

          state = cRunning;
        }

        // mutex now unlock, allowing others to push more requests
        //


        LLVMCompiler* jit = new LLVMCompiler();

        {
          timer::Running timer(ls_->time_spent);
          jit->compile(ls_, req->vmmethod(), req->is_block());
          jit->generate_function(ls_);
        }

        if(show_machine_code_) {
          jit->show_machine_code();
        }

        // Ok, compiled, generated machine code, now update MachineMethod

        // Ok, now we are manipulating managed memory, so make
        // sure the GC doesn't run.
        ls_->shared().gc_dependent();

        req->vmmethod()->set_jitted(jit->llvm_function(),
                                    jit->code_bytes(),
                                    jit->function_pointer());

        if(req->is_block()) {
          BlockEnvironment* be = req->block_env();
          if(!be) {
            llvm::outs() << "Fatal error in JIT. Expected a BlockEnvironment.\n";
          } else {
            be->set_native_function(jit->function_pointer());
          }
        } else {
          MachineMethod* mm = req->machine_method();
          if(!mm) {
            llvm::outs() << "Fatal error in JIT. Expected a MachineMethod.\n";
          } else {
            mm->update(req->vmmethod(), jit);
            mm->activate();
          }
        }

        int which = ls_->add_jitted_method();
        if(ls_->config().jit_show_compiling) {
          llvm::outs() << "[[[ JIT finished background compiling "
                    << which
                    << (req->is_block() ? " (block)" : " (method)")
                    << " ]]]\n";
        }

        delete req;

        // We don't depend on the GC here, so let it run independent
        // of us.
        ls_->shared().gc_independent();
      }
    }

    virtual void perform() {
      const char* thread_name = "rbx.jit";
      ManagedThread::set_current(ls_, thread_name);

      ls_->set_run_state(ManagedThread::eIndependent);

      RUBINIUS_THREAD_START(thread_name, ls_->thread_id(), 1);

#ifndef RBX_WINDOWS
      sigset_t set;
      sigfillset(&set);
      pthread_sigmask(SIG_SETMASK, &set, NULL);
#endif

      for(;;) { // forever

        BackgroundCompileRequest* req = 0;

        // Lock, wait, get a request, unlock
        {
          utilities::thread::Mutex::LockGuard guard(mutex_);

          if(pause_) {
            state = cPaused;

            paused_ = true;
            pause_condition_.broadcast();

            if(stop_) goto halt;

            while(pause_) {
              condition_.wait(mutex_);
              if(stop_) goto halt;
            }

            state = cUnknown;
            paused_ = false;
          }

          // If we've been asked to stop, do so now.
          if(stop_) goto halt;


          while(pending_requests_.empty()) {
            state = cIdle;

            // unlock and wait...
            condition_.wait(mutex_);

            if(stop_) goto halt;
          }

          // now locked again, shift a request
          req = pending_requests_.front();

          state = cRunning;
        }

        // This isn't ideal, but it's the safest. Keep the GC from
        // running while we're building the IR.
        ls_->gc_dependent();

        Context ctx(ls_);
        jit::Compiler jit(&ctx);

        // mutex now unlock, allowing others to push more requests
        //

        current_req_ = req;
        current_compiler_ = &jit;

        int spec_id = 0;
        Class* cls = req->receiver_class();
        if(cls && !cls->nil_p()) {
          spec_id = cls->class_id();
        }

        void* func = 0;
        {
          timer::Running<1000000> timer(ls_->shared().stats.jit_time_spent);

          jit.compile(req);

          func = jit.generate_function();
        }

        // We were unable to compile this function, likely
        // because it's got something we don't support.
        if(!func) {
          if(ls_->config().jit_show_compiling) {
            CompiledCode* code = req->method();
            llvm::outs() << "[[[ JIT error background compiling "
                      << ls_->enclosure_name(code) << "#" << ls_->symbol_debug_str(code->name())
                      << (req->is_block() ? " (block)" : " (method)")
                      << " ]]]\n";
          }
          // If someone was waiting on this, wake them up.
          if(utilities::thread::Condition* cond = req->waiter()) {
            cond->signal();
          }
//.........这里部分代码省略.........

 ~NoAccessManagedMemory() {
   ls_->shared().gc_dependent();
 }

 NoAccessManagedMemory(LLVMState* ls)
   : ls_(ls)
 {
   ls_->shared().gc_independent();
 }