test/563-checker-fakestring/smali/TestCase.smali

# 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.

.class public LTestCase;
.super Ljava/lang/Object;

# Test that all vregs holding the new-instance are updated after the
# StringFactory call.

## CHECK-START: java.lang.String TestCase.vregAliasing(byte[]) register (after)
## CHECK-DAG:                Return [<<String:l\d+>>]
## CHECK-DAG:     <<String>> InvokeStaticOrDirect  method_name:java.lang.String.<init>

.method public static vregAliasing([B)Ljava/lang/String;
   .registers 5

   # Create new instance of String and store it to v0, v1, v2.
   new-instance v0, Ljava/lang/String;
   move-object v1, v0
   move-object v2, v0

   # Call String.<init> on v1.
   const-string v3, "UTF8"
   invoke-direct {v1, p0, v3}, Ljava/lang/String;-><init>([BLjava/lang/String;)V

   # Return the object from v2.
   return-object v2

.end method

# Test usage of String new-instance before it is initialized.

## CHECK-START: void TestCase.compareNewInstance() register (after)
## CHECK-DAG:     <<Null:l\d+>>   InvokeStaticOrDirect method_name:Main.$noinline$HiddenNull
## CHECK-DAG:     <<String:l\d+>> NewInstance
## CHECK-DAG:     <<Cond:z\d+>>   NotEqual [<<Null>>,<<String>>]
## CHECK-DAG:                     If [<<Cond>>]

.method public static compareNewInstance()V
   .registers 3

   invoke-static {}, LMain;->$noinline$HiddenNull()Ljava/lang/Object;
   move-result-object v1

   new-instance v0, Ljava/lang/String;
   if-ne v0, v1, :return

   # Will throw NullPointerException if this branch is taken.
   const v1, 0x0
   const-string v2, "UTF8"
   invoke-direct {v0, v1, v2}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   return-void

   :return
   return-void

.end method

# Test deoptimization between String's allocation and initialization. When not
# compiling --debuggable, the NewInstance will be optimized out.

## CHECK-START: int TestCase.deoptimizeNewInstance(int[], byte[]) register (after)
## CHECK:         <<Null:l\d+>>   NullConstant
## CHECK:                         Deoptimize env:[[<<Null>>,{{.*]]}}
## CHECK:                         InvokeStaticOrDirect method_name:java.lang.String.<init>

## CHECK-START-DEBUGGABLE: int TestCase.deoptimizeNewInstance(int[], byte[]) register (after)
## CHECK:         <<String:l\d+>> NewInstance
## CHECK:                         Deoptimize env:[[<<String>>,{{.*]]}}
## CHECK:                         InvokeStaticOrDirect method_name:java.lang.String.<init>

.method public static deoptimizeNewInstance([I[B)I
   .registers 6

   const v2, 0x0
   const v1, 0x1

   new-instance v0, Ljava/lang/String; # HNewInstance(String)

   # Deoptimize here if the array is too short.
   aget v1, p0, v1              # v1 = int_array[0x1]
   add-int/2addr v2, v1         # v2 = 0x0 + v1

   # Check that we're being executed by the interpreter.
   invoke-static {}, LMain;->assertIsInterpreted()V

   # String allocation should succeed.
   const-string v3, "UTF8"
   invoke-direct {v0, p1, v3}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   # Transformed into invoke StringFactory(p1,v3).
   # The use of v0 is dropped (so HNewInstance(String) ends up having 0 uses and is removed).

   # This ArrayGet will throw ArrayIndexOutOfBoundsException.
   const v1, 0x4
   aget v1, p0, v1
   add-int/2addr v2, v1

   return v2

.end method

# Test that a redundant NewInstance is removed if not used and not compiling
# --debuggable.

## CHECK-START: java.lang.String TestCase.removeNewInstance(byte[]) register (after)
## CHECK-NOT:     NewInstance
## CHECK-NOT:     LoadClass

## CHECK-START-DEBUGGABLE: java.lang.String TestCase.removeNewInstance(byte[]) register (after)
## CHECK:         NewInstance

.method public static removeNewInstance([B)Ljava/lang/String;
   .registers 5

   new-instance v0, Ljava/lang/String;
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   return-object v0
   # Although it looks like we "use" the new-instance v0 here, the optimizing compiler
   # transforms all uses of the new-instance into uses of the StringFactory invoke.
   # therefore the HNewInstance for v0 becomes dead and is removed.

.end method

# Test #1 for irreducible loops and String.<init>.
.method public static irreducibleLoopAndStringInit1([BZ)Ljava/lang/String;
   .registers 5

   new-instance v0, Ljava/lang/String;

   # Irreducible loop
   if-eqz p1, :loop_entry
   :loop_header
   xor-int/lit8 p1, p1, 0x1
   :loop_entry
   if-eqz p1, :string_init
   goto :loop_header

   :string_init
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   return-object v0

.end method

# Test #2 for irreducible loops and String.<init>.
.method public static irreducibleLoopAndStringInit2([BZ)Ljava/lang/String;
   .registers 5

   new-instance v0, Ljava/lang/String;

   # Irreducible loop
   if-eqz p1, :loop_entry
   :loop_header
   if-eqz p1, :string_init
   :loop_entry
   xor-int/lit8 p1, p1, 0x1
   goto :loop_header

   :string_init
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   return-object v0

.end method

# Test #3 for irreducible loops and String.<init> alias.
.method public static irreducibleLoopAndStringInit3([BZ)Ljava/lang/String;
   .registers 5

   new-instance v0, Ljava/lang/String;
   move-object v2, v0

   # Irreducible loop
   if-eqz p1, :loop_entry
   :loop_header
   xor-int/lit8 p1, p1, 0x1
   :loop_entry
   if-eqz p1, :string_init
   goto :loop_header

   :string_init
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   return-object v2

.end method

# Test with a loop between allocation and String.<init>.
.method public static loopAndStringInit([BZ)Ljava/lang/String;
   .registers 5

   new-instance v0, Ljava/lang/String;

   # Loop
   :loop_header
   if-eqz p1, :loop_exit
   xor-int/lit8 p1, p1, 0x1
   goto :loop_header

   :loop_exit
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   return-object v0

.end method

# Test with a loop and aliases between allocation and String.<init>.
.method public static loopAndStringInitAlias([BZ)Ljava/lang/String;
   .registers 5

   new-instance v0, Ljava/lang/String;
   move-object v2, v0

   # Loop
   :loop_header
   if-eqz p1, :loop_exit
   xor-int/lit8 p1, p1, 0x1
   goto :loop_header

   :loop_exit
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   return-object v2

.end method

# Test deoptimization after String initialization of a phi.
## CHECK-START: int TestCase.deoptimizeNewInstanceAfterLoop(int[], byte[], int) register (after)
## CHECK:         <<Invoke:l\d+>> InvokeStaticOrDirect method_name:java.lang.String.<init>
## CHECK:                         Deoptimize env:[[<<Invoke>>,{{.*]]}}

.method public static deoptimizeNewInstanceAfterLoop([I[BI)I
   .registers 8

   const v2, 0x0
   const v1, 0x1

   new-instance v0, Ljava/lang/String; # HNewInstance(String)
   move-object v4, v0
   # Loop
   :loop_header
   if-eqz p2, :loop_exit
   xor-int/lit8 p2, p2, 0x1
   goto :loop_header

   :loop_exit
   const-string v3, "UTF8"
   invoke-direct {v0, p1, v3}, Ljava/lang/String;-><init>([BLjava/lang/String;)V

   # Deoptimize here if the array is too short.
   aget v1, p0, v1              # v1 = int_array[0x1]
   add-int/2addr v2, v1         # v2 = 0x0 + v1

   # Check that we're being executed by the interpreter.
   invoke-static {}, LMain;->assertIsInterpreted()V

   # Check that the environments contain the right string.
   invoke-static {p1, v0}, LMain;->assertEqual([BLjava/lang/String;)V
   invoke-static {p1, v4}, LMain;->assertEqual([BLjava/lang/String;)V

   # This ArrayGet will throw ArrayIndexOutOfBoundsException.
   const v1, 0x4
   aget v1, p0, v1
   add-int/2addr v2, v1

   return v2

.end method

# Test with a loop between allocation and String.<init> and a null check.
## CHECK-START: java.lang.String TestCase.loopAndStringInitAndTest(byte[], boolean) builder (after)
## CHECK-DAG:     <<Null:l\d+>>   NullConstant
## CHECK-DAG:     <<String:l\d+>> NewInstance
## CHECK-DAG:     <<Cond:z\d+>>   NotEqual [<<String>>,<<Null>>]

## CHECK-START: java.lang.String TestCase.loopAndStringInitAndTest(byte[], boolean) register (after)
## CHECK-DAG:     <<String:l\d+>> NewInstance
.method public static loopAndStringInitAndTest([BZ)Ljava/lang/String;
   .registers 5

   new-instance v0, Ljava/lang/String;

   # Loop
   :loop_header
   # Use the new-instance in the only way it can be used.
   if-nez v0, :loop_exit
   xor-int/lit8 p1, p1, 0x1
   goto :loop_header

   :loop_exit
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   return-object v0

.end method

## CHECK-START: java.lang.String TestCase.loopAndStringInitAndPhi(byte[], boolean) register (after)
## CHECK-NOT:                    NewInstance
## CHECK-DAG:   <<Invoke1:l\d+>> InvokeStaticOrDirect method_name:java.lang.String.<init>
## CHECK-DAG:   <<Invoke2:l\d+>> InvokeStaticOrDirect method_name:java.lang.String.<init>
## CHECK-DAG:   <<Phi:l\d+>>     Phi [<<Invoke2>>,<<Invoke1>>]
## CHECK-DAG:                    Return [<<Phi>>]
.method public static loopAndStringInitAndPhi([BZ)Ljava/lang/String;
   .registers 4

   if-nez p1, :allocate_other
   new-instance v0, Ljava/lang/String;

   # Loop
   :loop_header
   if-eqz p1, :loop_exit
   goto :loop_header

   :loop_exit
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   goto : exit

   :allocate_other
   const-string v1, "UTF8"
   new-instance v0, Ljava/lang/String;
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   :exit
   return-object v0

.end method

.method public static loopAndTwoStringInitAndPhi([BZZ)Ljava/lang/String;
   .registers 6

   new-instance v0, Ljava/lang/String;
   new-instance v2, Ljava/lang/String;

   if-nez p2, :allocate_other

   # Loop
   :loop_header
   if-eqz p1, :loop_exit
   goto :loop_header

   :loop_exit
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   goto :exit

   :allocate_other

   # Loop
   :loop_header2
   if-eqz p1, :loop_exit2
   goto :loop_header2

   :loop_exit2
   const-string v1, "UTF8"
   invoke-direct {v2, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   move-object v0, v2

   :exit
   return-object v0

.end method

# Regression test for a new string flowing into a catch phi.
.method public static stringAndCatch([BZ)Ljava/lang/Object;
   .registers 4

   const v0, 0x0

   :try_start_a
   new-instance v0, Ljava/lang/String;

   # Loop
   :loop_header
   if-eqz p1, :loop_exit
   goto :loop_header

   :loop_exit
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   goto :exit
   :try_end_a
   .catch Ljava/lang/Exception; {:try_start_a .. :try_end_a} :catch_a

   :catch_a
   # Initially, we create a catch phi with the potential uninitalized string, which used to
   # trip the compiler. However, using that catch phi is an error caught by the verifier, so
   # having the phi is benign.
   const v0, 0x0

   :exit
   return-object v0

.end method

# Same test as above, but with a catch phi being used by the string constructor.
.method public static stringAndCatch2([BZ)Ljava/lang/Object;
   .registers 4

   const v0, 0x0
   new-instance v0, Ljava/lang/String;

   :try_start_a
   const-string v1, "UTF8"
   :try_end_a
   .catch Ljava/lang/Exception; {:try_start_a .. :try_end_a} :catch_a

   :catch_a
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   return-object v0

.end method

# Same test as above, but with a catch phi being used by the string constructor and
# a null test.
.method public static stringAndCatch3([BZ)Ljava/lang/Object;
   .registers 4

   const v0, 0x0
   new-instance v0, Ljava/lang/String;

   :try_start_a
   const-string v1, "UTF8"
   :try_end_a
   .catch Ljava/lang/Exception; {:try_start_a .. :try_end_a} :catch_a

   :catch_a
   if-eqz v0, :unexpected
   const-string v1, "UTF8"
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   goto :exit
   :unexpected
   const-string v0, "UTF8"
   :exit
   return-object v0

.end method

# Regression test that tripped the compiler.
.method public static stringAndPhi([BZ)Ljava/lang/Object;
   .registers 4

   new-instance v0, Ljava/lang/String;
   const-string v1, "UTF8"

   :loop_header
   if-nez p1, :unused
   if-eqz p1, :invoke
   goto :loop_header

   :invoke
   invoke-direct {v0, p0, v1}, Ljava/lang/String;-><init>([BLjava/lang/String;)V
   goto :exit

   :unused
   const-string v0, "UTF8"
   if-nez p1, :exit
   goto :unused

   :exit
   return-object v0

.end method