1/* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16import { CmdOptions } from "../cmdOptions"; 17import { 18 IRNode 19} from "../irnodes"; 20import { PandaGen } from "../pandagen"; 21import { VariableScope } from "../scope"; 22import { 23 loadLexicalEnv, 24 newLexicalEnv, 25 storeAccumulator 26} from "./bcGenUtil"; 27import { CacheList, getVregisterCache } from "./vregisterCache"; 28 29function createLexEnv(pandaGen: PandaGen, scope: VariableScope): IRNode[] { 30 let lexEnvVars = scope.getNumLexEnv(); 31 let insns: IRNode[] = []; 32 let scopeInfoIdx: number | undefined = undefined; 33 let lexVarInfo = scope.getLexVarInfo(); 34 if (CmdOptions.isDebugMode()) { 35 scopeInfoIdx = pandaGen.appendScopeInfo(lexVarInfo); 36 } 37 38 insns.push( 39 newLexicalEnv(lexEnvVars, scopeInfoIdx), 40 storeAccumulator(getVregisterCache(pandaGen, CacheList.LexEnv)) 41 ); 42 43 return insns; 44} 45 46function loadLexEnv(pandaGen: PandaGen): IRNode[] { 47 let insns: IRNode[] = []; 48 49 insns.push( 50 loadLexicalEnv(), 51 storeAccumulator(getVregisterCache(pandaGen, CacheList.LexEnv)), 52 ); 53 return insns; 54} 55 56export function expandLexEnv(pandaGen: PandaGen): IRNode[] { 57 let scope = pandaGen.getScope()!.getNearestVariableScope(); 58 let insns: IRNode[]; 59 60 if (!scope) { 61 throw new Error("pandagen must have one variable scope"); 62 } 63 64 if (scope.need2CreateLexEnv()) { 65 insns = createLexEnv(pandaGen, scope); 66 } else { 67 insns = loadLexEnv(pandaGen); 68 } 69 70 return insns; 71} 72