| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| import java.lang.reflect.Method; |
| |
| /** |
| * Tests properties of some string operations represented by intrinsics. |
| */ |
| public class Main { |
| |
| static final String ABC = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
| static final String XYZ = "XYZ"; |
| |
| // |
| // Variant intrinsics remain in the loop, but invariant references are hoisted out of the loop. |
| // |
| /// CHECK-START: int Main.liveIndexOf() licm (before) |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringIndexOf loop:{{B\d+}} outer_loop:none |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringIndexOfAfter loop:{{B\d+}} outer_loop:none |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringStringIndexOf loop:{{B\d+}} outer_loop:none |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringStringIndexOfAfter loop:{{B\d+}} outer_loop:none |
| // |
| /// CHECK-START: int Main.liveIndexOf() licm (after) |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringIndexOf loop:{{B\d+}} outer_loop:none |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringIndexOfAfter loop:{{B\d+}} outer_loop:none |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringStringIndexOf loop:none |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringStringIndexOfAfter loop:none |
| static int liveIndexOf() { |
| int k = ABC.length() + XYZ.length(); // does LoadString before loops |
| for (char c = 'A'; c <= 'Z'; c++) { |
| k += ABC.indexOf(c); |
| } |
| for (char c = 'A'; c <= 'Z'; c++) { |
| k += ABC.indexOf(c, 4); |
| } |
| for (char c = 'A'; c <= 'Z'; c++) { |
| k += ABC.indexOf(XYZ); |
| } |
| for (char c = 'A'; c <= 'Z'; c++) { |
| k += ABC.indexOf(XYZ, 2); |
| } |
| return k; |
| } |
| |
| // |
| // All dead intrinsics can be removed completely. |
| // |
| /// CHECK-START: int Main.deadIndexOf() dead_code_elimination$initial (before) |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringIndexOf loop:{{B\d+}} outer_loop:none |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringIndexOfAfter loop:{{B\d+}} outer_loop:none |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringStringIndexOf loop:{{B\d+}} outer_loop:none |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringStringIndexOfAfter loop:{{B\d+}} outer_loop:none |
| // |
| /// CHECK-START: int Main.deadIndexOf() dead_code_elimination$initial (after) |
| /// CHECK-NOT: InvokeVirtual intrinsic:StringIndexOf |
| /// CHECK-NOT: InvokeVirtual intrinsic:StringIndexOfAfter |
| /// CHECK-NOT: InvokeVirtual intrinsic:StringStringIndexOf |
| /// CHECK-NOT: InvokeVirtual intrinsic:StringStringIndexOfAfter |
| static int deadIndexOf() { |
| int k = ABC.length() + XYZ.length(); // does LoadString before loops |
| for (char c = 'A'; c <= 'Z'; c++) { |
| int d = ABC.indexOf(c); |
| } |
| for (char c = 'A'; c <= 'Z'; c++) { |
| int d = ABC.indexOf(c, 4); |
| } |
| for (char c = 'A'; c <= 'Z'; c++) { |
| int d = ABC.indexOf(XYZ); |
| } |
| for (char c = 'A'; c <= 'Z'; c++) { |
| int d = ABC.indexOf(XYZ, 2); |
| } |
| return k; |
| } |
| |
| // |
| // Explicit null check on receiver, implicit null check on argument prevents hoisting. |
| // |
| /// CHECK-START: int Main.indexOfExceptions(java.lang.String, java.lang.String) licm (after) |
| /// CHECK-DAG: <<String:l\d+>> NullCheck loop:<<Loop:B\d+>> outer_loop:none |
| /// CHECK-DAG: InvokeVirtual [<<String>>,{{l\d+}}] intrinsic:StringStringIndexOf loop:<<Loop>> outer_loop:none |
| static int indexOfExceptions(String s, String t) { |
| int k = 0; |
| for (char c = 'A'; c <= 'Z'; c++) { |
| k += s.indexOf(t); |
| } |
| return k; |
| } |
| |
| // |
| // Allows combining of returned "this". Also ensures that similar looking append() calls |
| // are not combined somehow through returned result. |
| // |
| /// CHECK-START: int Main.bufferLen2() instruction_simplifier (before) |
| /// CHECK-DAG: <<New:l\d+>> NewInstance |
| /// CHECK-DAG: <<String1:l\d+>> LoadString |
| /// CHECK-DAG: <<Append1:l\d+>> InvokeVirtual [<<New>>,<<String1>>] intrinsic:StringBufferAppend |
| /// CHECK-DAG: <<String2:l\d+>> LoadString |
| /// CHECK-DAG: <<Append2:l\d+>> InvokeVirtual [{{l\d+}},<<String2>>] intrinsic:StringBufferAppend |
| /// CHECK-DAG: InvokeVirtual [{{l\d+}}] intrinsic:StringBufferLength |
| // |
| /// CHECK-START: int Main.bufferLen2() instruction_simplifier (after) |
| /// CHECK-DAG: <<New:l\d+>> NewInstance |
| /// CHECK-DAG: <<String1:l\d+>> LoadString |
| /// CHECK-DAG: <<Append1:l\d+>> InvokeVirtual [<<New>>,<<String1>>] intrinsic:StringBufferAppend |
| /// CHECK-DAG: <<String2:l\d+>> LoadString |
| /// CHECK-DAG: <<Append2:l\d+>> InvokeVirtual [<<New>>,<<String2>>] intrinsic:StringBufferAppend |
| /// CHECK-DAG: InvokeVirtual [<<New>>] intrinsic:StringBufferLength |
| static int bufferLen2() { |
| StringBuffer s = new StringBuffer(); |
| return s.append("x").append("y").length(); |
| } |
| |
| static int bufferLen2Smali() throws Exception { |
| Class<?> c = Class.forName("Smali"); |
| Method m = c.getMethod("bufferLen2"); |
| return (Integer) m.invoke(null); |
| } |
| |
| // |
| // Allows combining of returned "this". Also ensures that similar looking append() calls |
| // are not combined somehow through returned result. |
| // |
| /// CHECK-START: int Main.builderLen2() instruction_simplifier (before) |
| /// CHECK-DAG: <<New:l\d+>> NewInstance |
| /// CHECK-DAG: <<String1:l\d+>> LoadString |
| /// CHECK-DAG: <<Append1:l\d+>> InvokeVirtual [<<New>>,<<String1>>] intrinsic:StringBuilderAppend |
| /// CHECK-DAG: <<String2:l\d+>> LoadString |
| /// CHECK-DAG: <<Append2:l\d+>> InvokeVirtual [{{l\d+}},<<String2>>] intrinsic:StringBuilderAppend |
| /// CHECK-DAG: InvokeVirtual [{{l\d+}}] intrinsic:StringBuilderLength |
| // |
| /// CHECK-START: int Main.builderLen2() instruction_simplifier (after) |
| /// CHECK-DAG: <<New:l\d+>> NewInstance |
| /// CHECK-DAG: <<String1:l\d+>> LoadString |
| /// CHECK-DAG: <<Append1:l\d+>> InvokeVirtual [<<New>>,<<String1>>] intrinsic:StringBuilderAppend |
| /// CHECK-DAG: <<String2:l\d+>> LoadString |
| /// CHECK-DAG: <<Append2:l\d+>> InvokeVirtual [<<New>>,<<String2>>] intrinsic:StringBuilderAppend |
| /// CHECK-DAG: InvokeVirtual [<<New>>] intrinsic:StringBuilderLength |
| static int builderLen2() { |
| StringBuilder s = new StringBuilder(); |
| return s.append("x").append("y").length(); |
| } |
| |
| static int builderLen2Smali() throws Exception { |
| Class<?> c = Class.forName("Smali"); |
| Method m = c.getMethod("builderLen2"); |
| return (Integer) m.invoke(null); |
| } |
| |
| // |
| // Similar situation in a loop. |
| // |
| /// CHECK-START: int Main.bufferLoopAppender() instruction_simplifier (before) |
| /// CHECK-DAG: <<New:l\d+>> NewInstance loop:none |
| /// CHECK-DAG: <<String1:l\d+>> LoadString loop:<<Loop:B\d+>> |
| /// CHECK-DAG: <<Null1:l\d+>> NullCheck [<<New>>] loop:<<Loop>> |
| /// CHECK-DAG: <<Append1:l\d+>> InvokeVirtual [<<Null1>>,<<String1>>] intrinsic:StringBufferAppend loop:<<Loop>> |
| /// CHECK-DAG: <<String2:l\d+>> LoadString loop:<<Loop>> |
| /// CHECK-DAG: <<Append2:l\d+>> InvokeVirtual [{{l\d+}},<<String2>>] intrinsic:StringBufferAppend loop:<<Loop>> |
| /// CHECK-DAG: <<String3:l\d+>> LoadString loop:<<Loop>> |
| /// CHECK-DAG: <<Append3:l\d+>> InvokeVirtual [{{l\d+}},<<String3>>] intrinsic:StringBufferAppend loop:<<Loop>> |
| /// CHECK-DAG: InvokeVirtual [{{l\d+}}] intrinsic:StringBufferLength loop:none |
| // |
| /// CHECK-START: int Main.bufferLoopAppender() instruction_simplifier (after) |
| /// CHECK-DAG: <<New:l\d+>> NewInstance loop:none |
| /// CHECK-DAG: <<String1:l\d+>> LoadString loop:<<Loop:B\d+>> |
| /// CHECK-DAG: <<Append1:l\d+>> InvokeVirtual [<<New>>,<<String1>>] intrinsic:StringBufferAppend loop:<<Loop>> |
| /// CHECK-DAG: <<String2:l\d+>> LoadString loop:<<Loop>> |
| /// CHECK-DAG: <<Append2:l\d+>> InvokeVirtual [<<New>>,<<String2>>] intrinsic:StringBufferAppend loop:<<Loop>> |
| /// CHECK-DAG: <<String3:l\d+>> LoadString loop:<<Loop>> |
| /// CHECK-DAG: <<Append3:l\d+>> InvokeVirtual [<<New>>,<<String3>>] intrinsic:StringBufferAppend loop:<<Loop>> |
| /// CHECK-DAG: InvokeVirtual [<<New>>] intrinsic:StringBufferLength loop:none |
| static int bufferLoopAppender() { |
| StringBuffer b = new StringBuffer(); |
| for (int i = 0; i < 10; i++) { |
| b.append("x").append("y").append("z"); |
| } |
| return b.length(); |
| } |
| |
| static int bufferLoopAppenderSmali() throws Exception { |
| Class<?> c = Class.forName("Smali"); |
| Method m = c.getMethod("bufferLoopAppender"); |
| return (Integer) m.invoke(null); |
| } |
| |
| // |
| // Similar situation in a loop. |
| // |
| /// CHECK-START: int Main.builderLoopAppender() instruction_simplifier (before) |
| /// CHECK-DAG: <<New:l\d+>> NewInstance loop:none |
| /// CHECK-DAG: <<String1:l\d+>> LoadString loop:<<Loop:B\d+>> |
| /// CHECK-DAG: <<Null1:l\d+>> NullCheck [<<New>>] loop:<<Loop>> |
| /// CHECK-DAG: <<Append1:l\d+>> InvokeVirtual [<<Null1>>,<<String1>>] intrinsic:StringBuilderAppend loop:<<Loop>> |
| /// CHECK-DAG: <<String2:l\d+>> LoadString loop:<<Loop>> |
| /// CHECK-DAG: <<Append2:l\d+>> InvokeVirtual [{{l\d+}},<<String2>>] intrinsic:StringBuilderAppend loop:<<Loop>> |
| /// CHECK-DAG: <<String3:l\d+>> LoadString loop:<<Loop>> |
| /// CHECK-DAG: <<Append3:l\d+>> InvokeVirtual [{{l\d+}},<<String3>>] intrinsic:StringBuilderAppend loop:<<Loop>> |
| /// CHECK-DAG: InvokeVirtual [{{l\d+}}] intrinsic:StringBuilderLength loop:none |
| // |
| /// CHECK-START: int Main.builderLoopAppender() instruction_simplifier (after) |
| /// CHECK-DAG: <<New:l\d+>> NewInstance loop:none |
| /// CHECK-DAG: <<String1:l\d+>> LoadString loop:<<Loop:B\d+>> |
| /// CHECK-DAG: <<Append1:l\d+>> InvokeVirtual [<<New>>,<<String1>>] intrinsic:StringBuilderAppend loop:<<Loop>> |
| /// CHECK-DAG: <<String2:l\d+>> LoadString loop:<<Loop>> |
| /// CHECK-DAG: <<Append2:l\d+>> InvokeVirtual [<<New>>,<<String2>>] intrinsic:StringBuilderAppend loop:<<Loop>> |
| /// CHECK-DAG: <<String3:l\d+>> LoadString loop:<<Loop>> |
| /// CHECK-DAG: <<Append3:l\d+>> InvokeVirtual [<<New>>,<<String3>>] intrinsic:StringBuilderAppend loop:<<Loop>> |
| /// CHECK-DAG: InvokeVirtual [<<New>>] intrinsic:StringBuilderLength loop:none |
| static int builderLoopAppender() { |
| StringBuilder b = new StringBuilder(); |
| for (int i = 0; i < 10; i++) { |
| b.append("x").append("y").append("z"); |
| } |
| return b.length(); |
| } |
| |
| static int builderLoopAppenderSmali() throws Exception { |
| Class<?> c = Class.forName("Smali"); |
| Method m = c.getMethod("bufferLoopAppender"); |
| return (Integer) m.invoke(null); |
| } |
| |
| // |
| // All calls in the loop-body and thus loop can be eliminated. |
| // |
| /// CHECK-START: int Main.bufferDeadLoop() instruction_simplifier (before) |
| /// CHECK-DAG: Phi loop:<<Loop:B\d+>> |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringBufferToString loop:<<Loop>> |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringStringIndexOfAfter loop:<<Loop>> |
| // |
| /// CHECK-START: int Main.bufferDeadLoop() loop_optimization (after) |
| /// CHECK-NOT: Phi |
| /// CHECK-NOT: InvokeVirtual intrinsic:StringBufferToString |
| /// CHECK-NOT: InvokeVirtual intrinsic:StringStringIndexOfAfter |
| static int bufferDeadLoop() { |
| StringBuffer b = new StringBuffer(); |
| String x = "x"; |
| for (int i = 0; i < 10; i++) { |
| int d = b.toString().indexOf(x, 1); |
| } |
| return b.length(); |
| } |
| |
| // |
| // All calls in the loop-body and thus loop can be eliminated. |
| // |
| /// CHECK-START: int Main.builderDeadLoop() instruction_simplifier (before) |
| /// CHECK-DAG: Phi loop:<<Loop:B\d+>> |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringBuilderToString loop:<<Loop>> |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringStringIndexOfAfter loop:<<Loop>> |
| // |
| /// CHECK-START: int Main.builderDeadLoop() loop_optimization (after) |
| /// CHECK-NOT: Phi |
| /// CHECK-NOT: InvokeVirtual intrinsic:StringBuilderToString |
| /// CHECK-NOT: InvokeVirtual intrinsic:StringStringIndexOfAfter |
| static int builderDeadLoop() { |
| StringBuilder b = new StringBuilder(); |
| String x = "x"; |
| for (int i = 0; i < 10; i++) { |
| int d = b.toString().indexOf(x, 1); |
| } |
| return b.length(); |
| } |
| |
| // Regression b/33656359: StringBuffer x is passed to constructor of String |
| // (this caused old code to crash due to missing nullptr check). |
| // |
| /// CHECK-START: void Main.doesNothing() instruction_simplifier (before) |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringBufferToString |
| // |
| /// CHECK-START: void Main.doesNothing() instruction_simplifier (after) |
| /// CHECK-DAG: InvokeVirtual intrinsic:StringBufferToString |
| static void doesNothing() { |
| StringBuffer x = new StringBuffer(); |
| String y = new String(x); |
| x.toString(); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| expectEquals(1865, liveIndexOf()); |
| expectEquals(29, deadIndexOf()); |
| |
| try { |
| indexOfExceptions(null, XYZ); |
| throw new Error("Expected: NPE"); |
| } catch (NullPointerException e) { |
| } |
| try { |
| indexOfExceptions(ABC, null); |
| throw new Error("Expected: NPE"); |
| } catch (NullPointerException e) { |
| } |
| expectEquals(598, indexOfExceptions(ABC, XYZ)); |
| |
| expectEquals(2, bufferLen2()); |
| expectEquals(2, bufferLen2Smali()); |
| expectEquals(2, builderLen2()); |
| expectEquals(2, builderLen2Smali()); |
| expectEquals(30, bufferLoopAppender()); |
| expectEquals(30, bufferLoopAppenderSmali()); |
| expectEquals(30, builderLoopAppender()); |
| expectEquals(30, builderLoopAppenderSmali()); |
| expectEquals(0, bufferDeadLoop()); |
| expectEquals(0, builderDeadLoop()); |
| |
| doesNothing(); |
| |
| System.out.println("passed"); |
| } |
| |
| private static void expectEquals(int expected, int result) { |
| if (expected != result) { |
| throw new Error("Expected: " + expected + ", found: " + result); |
| } |
| } |
| } |
