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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.
*/
/*
* Common string pool for the profiler
*/
#include "Hprof.h"
static HashTable *gStringHashTable;
int
hprofStartup_String()
{
gStringHashTable = dvmHashTableCreate(512, free);
if (gStringHashTable == NULL) {
return UNIQUE_ERROR();
}
return 0;
}
int
hprofShutdown_String()
{
dvmHashTableFree(gStringHashTable);
return 0;
}
static u4
computeUtf8Hash(const char *str)
{
u4 hash = 0;
const char *cp;
char c;
cp = str;
while ((c = *cp++) != '\0') {
hash = hash * 31 + c;
}
return hash;
}
hprof_string_id
hprofLookupStringId(const char *str)
{
void *val;
u4 hashValue;
dvmHashTableLock(gStringHashTable);
hashValue = computeUtf8Hash(str);
val = dvmHashTableLookup(gStringHashTable, hashValue, (void *)str,
(HashCompareFunc)strcmp, false);
if (val == NULL) {
const char *newStr;
newStr = strdup(str);
val = dvmHashTableLookup(gStringHashTable, hashValue, (void *)newStr,
(HashCompareFunc)strcmp, true);
assert(val != NULL);
}
dvmHashTableUnlock(gStringHashTable);
return (hprof_string_id)val;
}
int
hprofDumpStrings(hprof_context_t *ctx)
{
HashIter iter;
hprof_record_t *rec = &ctx->curRec;
int err;
dvmHashTableLock(gStringHashTable);
for (err = 0, dvmHashIterBegin(gStringHashTable, &iter);
err == 0 && !dvmHashIterDone(&iter);
dvmHashIterNext(&iter))
{
err = hprofStartNewRecord(ctx, HPROF_TAG_STRING, HPROF_TIME);
if (err == 0) {
const char *str;
str = (const char *)dvmHashIterData(&iter);
assert(str != NULL);
/* STRING format:
*
* ID: ID for this string
* [u1]*: UTF8 characters for string (NOT NULL terminated)
* (the record format encodes the length)
*
* We use the address of the string data as its ID.
*/
err = hprofAddU4ToRecord(rec, (u4)str);
if (err == 0) {
err = hprofAddUtf8StringToRecord(rec, str);
}
}
}
dvmHashTableUnlock(gStringHashTable);
return err;
}
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