C++ Compile::env方法代码示例

JVMState* DynamicCallGenerator::generate(JVMState* jvms) {
  GraphKit kit(jvms);
  Compile* C = kit.C;
  PhaseGVN& gvn = kit.gvn();

  if (C->log() != NULL) {
    C->log()->elem("dynamic_call bci='%d'", jvms->bci());
  }

  // Get the constant pool cache from the caller class.
  ciMethod* caller_method = jvms->method();
  ciBytecodeStream str(caller_method);
  str.force_bci(jvms->bci());  // Set the stream to the invokedynamic bci.
  assert(str.cur_bc() == Bytecodes::_invokedynamic, "wrong place to issue a dynamic call!");
  ciCPCache* cpcache = str.get_cpcache();

  // Get the offset of the CallSite from the constant pool cache
  // pointer.
  int index = str.get_method_index();
  size_t call_site_offset = cpcache->get_f1_offset(index);

  // Load the CallSite object from the constant pool cache.
  const TypeOopPtr* cpcache_type   = TypeOopPtr::make_from_constant(cpcache);  // returns TypeAryPtr of type T_OBJECT
  const TypeOopPtr* call_site_type = TypeOopPtr::make_from_klass(C->env()->CallSite_klass());
  Node* cpcache_adr   = kit.makecon(cpcache_type);
  Node* call_site_adr = kit.basic_plus_adr(cpcache_adr, call_site_offset);
  // The oops in the constant pool cache are not compressed; load then as raw pointers.
  Node* call_site     = kit.make_load(kit.control(), call_site_adr, call_site_type, T_ADDRESS, Compile::AliasIdxRaw);

  // Load the target MethodHandle from the CallSite object.
  const TypeOopPtr* target_type = TypeOopPtr::make_from_klass(C->env()->MethodHandle_klass());
  Node* target_mh_adr = kit.basic_plus_adr(call_site, java_lang_invoke_CallSite::target_offset_in_bytes());
  Node* target_mh     = kit.make_load(kit.control(), target_mh_adr, target_type, T_OBJECT);

  address resolve_stub = SharedRuntime::get_resolve_opt_virtual_call_stub();

  CallStaticJavaNode* call = new (C, tf()->domain()->cnt()) CallStaticJavaNode(tf(), resolve_stub, method(), kit.bci());
  // invokedynamic is treated as an optimized invokevirtual.
  call->set_optimized_virtual(true);
  // Take extra care (in the presence of argument motion) not to trash the SP:
  call->set_method_handle_invoke(true);

  // Pass the target MethodHandle as first argument and shift the
  // other arguments.
  call->init_req(0 + TypeFunc::Parms, target_mh);
  uint nargs = call->method()->arg_size();
  for (uint i = 1; i < nargs; i++) {
    Node* arg = kit.argument(i - 1);
    call->init_req(i + TypeFunc::Parms, arg);
  }

  kit.set_edges_for_java_call(call);
  Node* ret = kit.set_results_for_java_call(call);
  kit.push_node(method()->return_type()->basic_type(), ret);
  return kit.transfer_exceptions_into_jvms();
}

JVMState* ParseGenerator::generate(JVMState* jvms, Parse* parent_parser) {
  Compile* C = Compile::current();

  if (is_osr()) {
    // The JVMS for a OSR has a single argument (see its TypeFunc).
    assert(jvms->depth() == 1, "no inline OSR");
  }

  if (C->failing()) {
    return NULL;  // bailing out of the compile; do not try to parse
  }

  Parse parser(jvms, method(), _expected_uses, parent_parser);
  // Grab signature for matching/allocation
#ifdef ASSERT
  if (parser.tf() != (parser.depth() == 1 ? C->tf() : tf())) {
    MutexLockerEx ml(Compile_lock, Mutex::_no_safepoint_check_flag);
    assert(C->env()->system_dictionary_modification_counter_changed(),
           "Must invalidate if TypeFuncs differ");
  }
#endif

  GraphKit& exits = parser.exits();

  if (C->failing()) {
    while (exits.pop_exception_state() != NULL) ;
    return NULL;
  }

  assert(exits.jvms()->same_calls_as(jvms), "sanity");

  // Simply return the exit state of the parser,
  // augmented by any exceptional states.
  return exits.transfer_exceptions_into_jvms();
}

//.........这里部分代码省略.........

  const TypeTuple *r = call->tf()->domain();
  for (int i1 = 0; i1 < method()->arg_size(); i1++) {
    if (call->in(TypeFunc::Parms + i1)->is_top() && r->field_at(TypeFunc::Parms + i1) != Type::HALF) {
      assert(Compile::current()->inlining_incrementally(), "shouldn't happen during parsing");
      return;
    }
  }

  if (call->in(TypeFunc::Memory)->is_top()) {
    assert(Compile::current()->inlining_incrementally(), "shouldn't happen during parsing");
    return;
  }

  Compile* C = Compile::current();
  // Remove inlined methods from Compiler's lists.
  if (call->is_macro()) {
    C->remove_macro_node(call);
  }

  // Make a clone of the JVMState that appropriate to use for driving a parse
  JVMState* old_jvms = call->jvms();
  JVMState* jvms = old_jvms->clone_shallow(C);
  uint size = call->req();
  SafePointNode* map = new (C) SafePointNode(size, jvms);
  for (uint i1 = 0; i1 < size; i1++) {
    map->init_req(i1, call->in(i1));
  }

  // Make sure the state is a MergeMem for parsing.
  if (!map->in(TypeFunc::Memory)->is_MergeMem()) {
    Node* mem = MergeMemNode::make(C, map->in(TypeFunc::Memory));
    C->initial_gvn()->set_type_bottom(mem);
    map->set_req(TypeFunc::Memory, mem);
  }

  uint nargs = method()->arg_size();
  // blow away old call arguments
  Node* top = C->top();
  for (uint i1 = 0; i1 < nargs; i1++) {
    map->set_req(TypeFunc::Parms + i1, top);
  }
  jvms->set_map(map);

  // Make enough space in the expression stack to transfer
  // the incoming arguments and return value.
  map->ensure_stack(jvms, jvms->method()->max_stack());
  for (uint i1 = 0; i1 < nargs; i1++) {
    map->set_argument(jvms, i1, call->in(TypeFunc::Parms + i1));
  }

  // This check is done here because for_method_handle_inline() method
  // needs jvms for inlined state.
  if (!do_late_inline_check(jvms)) {
    map->disconnect_inputs(NULL, C);
    return;
  }

  C->print_inlining_insert(this);

  CompileLog* log = C->log();
  if (log != NULL) {
    log->head("late_inline method='%d'", log->identify(method()));
    JVMState* p = jvms;
    while (p != NULL) {
      log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
      p = p->caller();
    }
    log->tail("late_inline");
  }

  // Setup default node notes to be picked up by the inlining
  Node_Notes* old_nn = C->default_node_notes();
  if (old_nn != NULL) {
    Node_Notes* entry_nn = old_nn->clone(C);
    entry_nn->set_jvms(jvms);
    C->set_default_node_notes(entry_nn);
  }

  // Now perform the inling using the synthesized JVMState
  JVMState* new_jvms = _inline_cg->generate(jvms, NULL);
  if (new_jvms == NULL)  return;  // no change
  if (C->failing())      return;

  // Capture any exceptional control flow
  GraphKit kit(new_jvms);

  // Find the result object
  Node* result = C->top();
  int   result_size = method()->return_type()->size();
  if (result_size != 0 && !kit.stopped()) {
    result = (result_size == 1) ? kit.pop() : kit.pop_pair();
  }

  C->set_has_loops(C->has_loops() || _inline_cg->method()->has_loops());
  C->env()->notice_inlined_method(_inline_cg->method());
  C->set_inlining_progress(true);

  kit.replace_call(call, result);
}