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/*
* Copyright (C) 2010 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.
*/
#include "Dalvik.h"
#include "alloc/HeapBitmap.h"
#include "alloc/HeapSource.h"
#include "alloc/Verify.h"
#include "alloc/Visit.h"
/*
* Visitor applied to each reference field when searching for things
* that point to an object. Sets the argument to NULL when a match is
* found.
*/
static void dumpReferencesVisitor(void *pObj, void *arg)
{
Object *obj = *(Object **)pObj;
Object *lookingFor = *(Object **)arg;
if (lookingFor != NULL && lookingFor == obj) {
*(Object **)arg = NULL;
}
}
/*
* Visitor applied to each bitmap element to search for things that
* point to an object. Logs a message when a match is found.
*/
static void dumpReferencesCallback(Object *obj, void *arg)
{
if (obj == (Object *)arg) {
return;
}
dvmVisitObject(dumpReferencesVisitor, obj, &arg);
if (arg == NULL) {
ALOGD("Found %p in the heap @ %p", arg, obj);
dvmDumpObject(obj);
}
}
/*
* Visitor applied to each root to search for things that point to an
* object. Logs a message when a match is found.
*/
static void dumpReferencesRootVisitor(void *ptr, u4 threadId,
RootType type, void *arg)
{
Object *obj = *(Object **)ptr;
Object *lookingFor = *(Object **)arg;
if (obj == lookingFor) {
ALOGD("Found %p in a root @ %p", arg, ptr);
}
}
/*
* Searches the roots and heap for object references.
*/
static void dumpReferences(const Object *obj)
{
HeapBitmap *bitmap = dvmHeapSourceGetLiveBits();
void *arg = (void *)obj;
dvmVisitRoots(dumpReferencesRootVisitor, arg);
dvmHeapBitmapWalk(bitmap, dumpReferencesCallback, arg);
}
/*
* Checks that the given reference points to a valid object.
*/
static void verifyReference(void *addr, void *arg)
{
Object *obj;
bool isValid;
assert(addr != NULL);
obj = *(Object **)addr;
if (obj == NULL) {
isValid = true;
} else {
isValid = dvmIsValidObject(obj);
}
if (!isValid) {
Object **parent = (Object **)arg;
if (*parent != NULL) {
ALOGE("Verify of object %p failed", *parent);
dvmDumpObject(*parent);
*parent = NULL;
}
ALOGE("Verify of reference %p @ %p failed", obj, addr);
dvmDumpObject(obj);
}
}
/*
* Verifies an object reference.
*/
void dvmVerifyObject(const Object *obj)
{
Object *arg = const_cast<Object*>(obj);
dvmVisitObject(verifyReference, arg, &arg);
if (arg == NULL) {
dumpReferences(obj);
dvmAbort();
}
}
/*
* Helper function to call dvmVerifyObject from a bitmap walker.
*/
static void verifyBitmapCallback(Object *obj, void *arg)
{
dvmVerifyObject(obj);
}
/*
* Verifies the object references in a heap bitmap. Assumes the VM is
* suspended.
*/
void dvmVerifyBitmap(const HeapBitmap *bitmap)
{
dvmHeapBitmapWalk(bitmap, verifyBitmapCallback, NULL);
}
/*
* Helper function to call verifyReference from the root verifier.
*/
static void verifyRootReference(void *addr, u4 threadId,
RootType type, void *arg)
{
verifyReference(addr, arg);
}
/*
* Verifies references in the roots.
*/
void dvmVerifyRoots()
{
dvmVisitRoots(verifyRootReference, NULL);
}
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