C++ LLVMState::write_barrier方法代码示例

//.........这里部分代码省略.........
        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();
          }

          current_req_ = 0;
          current_compiler_ = 0;
          pending_requests_.pop_front();
          delete req;

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

          continue;
        }

        if(show_machine_code_) {
          jit.show_machine_code();
        }

        // If the method has had jit'ing request disabled since we started
        // JIT'ing it, discard our work.
        if(!req->machine_code()->jit_disabled()) {

          jit::RuntimeDataHolder* rd = ctx.runtime_data_holder();

          atomic::memory_barrier();
          ls_->start_method_update();

          if(!req->is_block()) {
            if(spec_id) {
              req->method()->add_specialized(spec_id, reinterpret_cast<executor>(func), rd);
            } else {
              req->method()->set_unspecialized(reinterpret_cast<executor>(func), rd);
            }
          } else {
            req->method()->set_unspecialized(reinterpret_cast<executor>(func), rd);
          }

          req->machine_code()->clear_compiling();

          // assert(req->method()->jit_data());

          ls_->end_method_update();

          rd->run_write_barrier(ls_->write_barrier(), req->method());

          ls_->shared().stats.jitted_methods++;

          if(ls_->config().jit_show_compiling) {
            CompiledCode* code = req->method();
            llvm::outs() << "[[[ JIT finished 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();
        }

        current_req_ = 0;
        current_compiler_ = 0;
        pending_requests_.pop_front();
        delete req;

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

halt:
      RUBINIUS_THREAD_STOP(thread_name, ls_->thread_id(), 1);
    }

//.........这里部分代码省略.........
            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;
        }

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

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

        jit::Compiler jit;

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

          if(req->is_block()) {
            jit.compile_block(ls_, req->method(), req->vmmethod());
          } else {
            jit.compile_method(ls_, req->method(), req->vmmethod());
          }

          func = jit.generate_function(ls_);
        }

        // 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) {
            llvm::outs() << "[[[ JIT error in background compiling ]]]\n";
          }
          // If someone was waiting on this, wake them up.
          if(thread::Condition* cond = req->waiter()) {
            cond->signal();
          }

          delete req;

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

          continue;
        }

        if(show_machine_code_) {
          jit.show_machine_code();
        }

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

        if(!req->is_block()) {
          req->method()->execute = reinterpret_cast<executor>(func);
        }
        assert(req->method()->jit_data());

        req->method()->jit_data()->run_write_barrier(ls_->write_barrier(), req->method());

        ls_->shared().stats.jitted_methods++;

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

        // If someone was waiting on this, wake them up.
        if(thread::Condition* cond = req->waiter()) {
          cond->signal();
        }

        delete req;

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