github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/tools/checklocks/test/parameters.go (about)

     1  // Copyright 2020 The gVisor Authors.
     2  //
     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  package test
    16  
    17  func testParameterPassingbyAddrValid(tc *oneGuardStruct) {
    18  	tc.mu.Lock()
    19  	nestedWithGuardByAddr(&tc.guardedField, &tc.unguardedField)
    20  	tc.mu.Unlock()
    21  }
    22  
    23  func testParameterPassingByAddrInalid(tc *oneGuardStruct) {
    24  	nestedWithGuardByAddr(&tc.guardedField, &tc.unguardedField) // +checklocksfail
    25  }
    26  
    27  func testParameterPassingByValueValid(tc *oneGuardStruct) {
    28  	tc.mu.Lock()
    29  	nestedWithGuardByValue(tc.guardedField, tc.unguardedField)
    30  	tc.mu.Unlock()
    31  }
    32  
    33  func testParameterPassingByValueInalid(tc *oneGuardStruct) {
    34  	nestedWithGuardByValue(tc.guardedField, tc.unguardedField) // +checklocksfail
    35  }
    36  
    37  func nestedWithGuardByAddr(guardedField, unguardedField *int) {
    38  	*guardedField = 4
    39  	*unguardedField = 5
    40  }
    41  
    42  func nestedWithGuardByValue(guardedField, unguardedField int) {
    43  	// read the fields to keep SA4009 static analyzer happy.
    44  	_ = guardedField
    45  	_ = unguardedField
    46  	guardedField = 4
    47  	unguardedField = 5
    48  }