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/*
* Copyright (C) 2008 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 object pool
*/
#include "Hprof.h"
static HashTable *gClassHashTable;
int hprofStartup_Class()
{
gClassHashTable = dvmHashTableCreate(128, NULL);
if (gClassHashTable == NULL) {
return UNIQUE_ERROR();
}
return 0;
}
int hprofShutdown_Class()
{
dvmHashTableFree(gClassHashTable);
return 0;
}
static u4 computeClassHash(const ClassObject *clazz)
{
u4 hash;
const char *cp;
char c;
cp = clazz->descriptor;
hash = (u4)clazz->classLoader;
while ((c = *cp++) != '\0') {
hash = hash * 31 + c;
}
return hash;
}
static int classCmp(const void *v1, const void *v2)
{
const ClassObject *c1 = (const ClassObject *)v1;
const ClassObject *c2 = (const ClassObject *)v2;
intptr_t diff;
diff = (uintptr_t)c1->classLoader - (uintptr_t)c2->classLoader;
if (diff == 0) {
return strcmp(c1->descriptor, c2->descriptor);
}
return diff;
}
static int getPrettyClassNameId(const char *descriptor) {
std::string name(dvmHumanReadableDescriptor(descriptor));
return hprofLookupStringId(name.c_str());
}
hprof_class_object_id hprofLookupClassId(const ClassObject *clazz)
{
void *val;
if (clazz == NULL) {
/* Someone's probably looking up the superclass
* of java.lang.Object or of a primitive class.
*/
return (hprof_class_object_id)0;
}
dvmHashTableLock(gClassHashTable);
/* We're using the hash table as a list.
* TODO: replace the hash table with a more suitable structure
*/
val = dvmHashTableLookup(gClassHashTable, computeClassHash(clazz),
(void *)clazz, classCmp, true);
assert(val != NULL);
#ifdef NDEBUG
// variable defined but not used warning breaks -Werror
(void)val;
#endif
dvmHashTableUnlock(gClassHashTable);
/* Make sure that the class's name is in the string table.
* This is a bunch of extra work that we only have to do
* because of the order of tables in the output file
* (strings need to be dumped before classes).
*/
getPrettyClassNameId(clazz->descriptor);
return (hprof_class_object_id)clazz;
}
int hprofDumpClasses(hprof_context_t *ctx)
{
HashIter iter;
hprof_record_t *rec = &ctx->curRec;
int err;
dvmHashTableLock(gClassHashTable);
for (err = 0, dvmHashIterBegin(gClassHashTable, &iter);
err == 0 && !dvmHashIterDone(&iter);
dvmHashIterNext(&iter))
{
err = hprofStartNewRecord(ctx, HPROF_TAG_LOAD_CLASS, HPROF_TIME);
if (err == 0) {
const ClassObject *clazz;
clazz = (const ClassObject *)dvmHashIterData(&iter);
assert(clazz != NULL);
/* LOAD CLASS format:
*
* u4: class serial number (always > 0)
* ID: class object ID
* u4: stack trace serial number
* ID: class name string ID
*
* We use the address of the class object structure as its ID.
*/
hprofAddU4ToRecord(rec, clazz->serialNumber);
hprofAddIdToRecord(rec, (hprof_class_object_id)clazz);
hprofAddU4ToRecord(rec, HPROF_NULL_STACK_TRACE);
hprofAddIdToRecord(rec, getPrettyClassNameId(clazz->descriptor));
}
}
dvmHashTableUnlock(gClassHashTable);
return err;
}
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