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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.
*/
#include "Hprof.h"
#include "HprofStack.h"
#include "alloc/HeapInternal.h"
static HashTable *gStackFrameHashTable;
static u4 computeStackFrameHash(const StackFrameEntry *stackFrameEntry);
int
hprofStartup_StackFrame()
{
HashIter iter;
/* Cache the string "<unknown>" for use when the source file is
* unknown.
*/
hprofLookupStringId("<unknown>");
/* This will be called when a GC begins. */
for (dvmHashIterBegin(gStackFrameHashTable, &iter);
!dvmHashIterDone(&iter);
dvmHashIterNext(&iter)) {
StackFrameEntry *stackFrameEntry;
const Method *method;
/* Clear the 'live' bit at the start of the GC pass. */
stackFrameEntry = (StackFrameEntry *) dvmHashIterData(&iter);
stackFrameEntry->live = 0;
method = stackFrameEntry->frame.method;
if (method == NULL) {
continue;
}
/* Make sure the method name, descriptor, and source file are in
* the string table, and that the method class is in the class
* table. This is needed because strings and classes will be dumped
* before stack frames.
*/
if (method->name) {
hprofLookupStringId(method->name);
}
DexStringCache cache;
const char* descriptor;
dexStringCacheInit(&cache);
descriptor = dexProtoGetMethodDescriptor(&method->prototype, &cache);
hprofLookupStringId(descriptor);
dexStringCacheRelease(&cache);
const char* sourceFile = dvmGetMethodSourceFile(method);
if (sourceFile) {
hprofLookupStringId(sourceFile);
}
if (method->clazz) {
hprofLookupClassId(method->clazz);
}
}
return 0;
}
int
hprofShutdown_StackFrame()
{
HashIter iter;
/* This will be called when a GC has completed. */
for (dvmHashIterBegin(gStackFrameHashTable, &iter);
!dvmHashIterDone(&iter);
dvmHashIterNext(&iter)) {
const StackFrameEntry *stackFrameEntry;
/*
* If the 'live' bit is 0, the frame is not in use by any current
* heap object and may be destroyed.
*/
stackFrameEntry = (const StackFrameEntry *) dvmHashIterData(&iter);
if (!stackFrameEntry->live) {
dvmHashTableRemove(gStackFrameHashTable,
computeStackFrameHash(stackFrameEntry),
(void*) stackFrameEntry);
free((void*) stackFrameEntry);
}
}
return 0;
}
/* Only hash the 'frame' portion of the StackFrameEntry. */
static u4
computeStackFrameHash(const StackFrameEntry *stackFrameEntry)
{
u4 hash = 0;
const char *cp = (char *) &stackFrameEntry->frame;
int i;
for (i = 0; i < (int) sizeof(StackFrame); i++) {
hash = 31 * hash + cp[i];
}
return hash;
}
/* Only compare the 'frame' portion of the StackFrameEntry. */
static int
stackFrameCmp(const void *tableItem, const void *looseItem)
{
return memcmp(&((StackFrameEntry *)tableItem)->frame,
&((StackFrameEntry *) looseItem)->frame, sizeof(StackFrame));
}
static StackFrameEntry *
stackFrameDup(const StackFrameEntry *stackFrameEntry)
{
StackFrameEntry *newStackFrameEntry = malloc(sizeof(StackFrameEntry));
memcpy(newStackFrameEntry, stackFrameEntry, sizeof(StackFrameEntry));
return newStackFrameEntry;
}
hprof_stack_frame_id
hprofLookupStackFrameId(const StackFrameEntry *stackFrameEntry)
{
StackFrameEntry *val;
u4 hashValue;
/*
* Create the hash table on first contact. We can't do this in
* hprofStartupStackFrame, because we have to compute stack trace
* serial numbers and place them into object headers before the
* rest of hprof is triggered by a GC event.
*/
if (gStackFrameHashTable == NULL) {
gStackFrameHashTable = dvmHashTableCreate(512, free);
}
dvmHashTableLock(gStackFrameHashTable);
hashValue = computeStackFrameHash(stackFrameEntry);
val = dvmHashTableLookup(gStackFrameHashTable, hashValue,
(void *)stackFrameEntry, (HashCompareFunc)stackFrameCmp, false);
if (val == NULL) {
const StackFrameEntry *newStackFrameEntry;
newStackFrameEntry = stackFrameDup(stackFrameEntry);
val = dvmHashTableLookup(gStackFrameHashTable, hashValue,
(void *)newStackFrameEntry, (HashCompareFunc)stackFrameCmp, true);
assert(val != NULL);
}
/* Mark the frame as live (in use by an object in the current heap). */
val->live = 1;
dvmHashTableUnlock(gStackFrameHashTable);
return (hprof_stack_frame_id) val;
}
int
hprofDumpStackFrames(hprof_context_t *ctx)
{
HashIter iter;
hprof_record_t *rec = &ctx->curRec;
dvmHashTableLock(gStackFrameHashTable);
for (dvmHashIterBegin(gStackFrameHashTable, &iter);
!dvmHashIterDone(&iter);
dvmHashIterNext(&iter))
{
const StackFrameEntry *stackFrameEntry;
const Method *method;
int pc;
const char *sourceFile;
ClassObject *clazz;
int lineNum;
hprofStartNewRecord(ctx, HPROF_TAG_STACK_FRAME, HPROF_TIME);
stackFrameEntry = (const StackFrameEntry *) dvmHashIterData(&iter);
assert(stackFrameEntry != NULL);
method = stackFrameEntry->frame.method;
pc = stackFrameEntry->frame.pc;
sourceFile = dvmGetMethodSourceFile(method);
if (sourceFile == NULL) {
sourceFile = "<unknown>";
lineNum = 0;
} else {
lineNum = dvmLineNumFromPC(method, pc);
}
clazz = (ClassObject *) hprofLookupClassId(method->clazz);
/* STACK FRAME format:
*
* ID: ID for this stack frame
* ID: ID for the method name
* ID: ID for the method descriptor
* ID: ID for the source file name
* u4: class serial number
* u4: line number, 0 = no line information
*
* We use the address of the stack frame as its ID.
*/
DexStringCache cache;
const char* descriptor;
dexStringCacheInit(&cache);
descriptor = dexProtoGetMethodDescriptor(&method->prototype, &cache);
hprofAddIdToRecord(rec, (u4) stackFrameEntry);
hprofAddIdToRecord(rec, hprofLookupStringId(method->name));
hprofAddIdToRecord(rec, hprofLookupStringId(descriptor));
hprofAddIdToRecord(rec, hprofLookupStringId(sourceFile));
hprofAddU4ToRecord(rec, (u4) clazz->serialNumber);
hprofAddU4ToRecord(rec, (u4) lineNum);
dexStringCacheRelease(&cache);
}
dvmHashTableUnlock(gStackFrameHashTable);
return 0;
}
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