indirect_reference_table.cc revision 726079d3e2e50854cd6ca4c393f4529a796dba58
16c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes/* 26c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Copyright (C) 2009 The Android Open Source Project 36c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * 46c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Licensed under the Apache License, Version 2.0 (the "License"); 56c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * you may not use this file except in compliance with the License. 66c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * You may obtain a copy of the License at 76c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * 86c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * http://www.apache.org/licenses/LICENSE-2.0 96c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * 106c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Unless required by applicable law or agreed to in writing, software 116c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * distributed under the License is distributed on an "AS IS" BASIS, 126c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 136c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * See the License for the specific language governing permissions and 146c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * limitations under the License. 156c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes */ 166c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 176c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes#include "indirect_reference_table.h" 18a2501990dd0f68baf38ce19251949d7bb3ecfe5aElliott Hughes#include "jni_internal.h" 196c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes#include "reference_table.h" 20a2501990dd0f68baf38ce19251949d7bb3ecfe5aElliott Hughes#include "runtime.h" 215a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers#include "thread.h" 22cdd1d2d3fee0711b8b11db99f2dfb80113520100Ian Rogers#include "utils.h" 236c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 246c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes#include <cstdlib> 256c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 266c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughesnamespace art { 276c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 286c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughesstatic void AbortMaybe() { 29a2501990dd0f68baf38ce19251949d7bb3ecfe5aElliott Hughes // If -Xcheck:jni is on, it'll give a more detailed error before aborting. 30a2501990dd0f68baf38ce19251949d7bb3ecfe5aElliott Hughes if (!Runtime::Current()->GetJavaVM()->check_jni) { 31a2501990dd0f68baf38ce19251949d7bb3ecfe5aElliott Hughes // Otherwise, we want to abort rather than hand back a bad reference. 32a2501990dd0f68baf38ce19251949d7bb3ecfe5aElliott Hughes LOG(FATAL) << "JNI ERROR (app bug): see above."; 33a2501990dd0f68baf38ce19251949d7bb3ecfe5aElliott Hughes } 346c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 356c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 366c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott HughesIndirectReferenceTable::IndirectReferenceTable(size_t initialCount, 376c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes size_t maxCount, IndirectRefKind desiredKind) 386c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes{ 396c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes CHECK_GT(initialCount, 0U); 406c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes CHECK_LE(initialCount, maxCount); 41408f79aeb676251ba35667a64e86c20638d7cb0bIan Rogers CHECK_NE(desiredKind, kSirtOrInvalid); 426c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 43cf4c6c41b0084dc4567ff709fb8ce9ebd72b26acElliott Hughes table_ = reinterpret_cast<const Object**>(malloc(initialCount * sizeof(const Object*))); 446c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes CHECK(table_ != NULL); 456c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes#ifndef NDEBUG 46cf4c6c41b0084dc4567ff709fb8ce9ebd72b26acElliott Hughes memset(table_, 0xd1, initialCount * sizeof(const Object*)); 476c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes#endif 486c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 496c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes slot_data_ = reinterpret_cast<IndirectRefSlot*>(calloc(initialCount, sizeof(IndirectRefSlot))); 506c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes CHECK(slot_data_ != NULL); 516c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 52dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers segment_state_.all = IRT_FIRST_SEGMENT; 536c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes alloc_entries_ = initialCount; 546c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes max_entries_ = maxCount; 556c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes kind_ = desiredKind; 566c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 576c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 586c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott HughesIndirectReferenceTable::~IndirectReferenceTable() { 596c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes free(table_); 606c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes free(slot_data_); 616c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes table_ = NULL; 626c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes slot_data_ = NULL; 636c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes alloc_entries_ = max_entries_ = -1; 646c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 656c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 666c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes/* 676c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Make sure that the entry at "idx" is correctly paired with "iref". 686c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes */ 696c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughesbool IndirectReferenceTable::CheckEntry(const char* what, IndirectRef iref, int idx) const { 70cf4c6c41b0084dc4567ff709fb8ce9ebd72b26acElliott Hughes const Object* obj = table_[idx]; 716c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes IndirectRef checkRef = ToIndirectRef(obj, idx); 726c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (checkRef != iref) { 736c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(ERROR) << "JNI ERROR (app bug): attempt to " << what 746c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes << " stale " << kind_ << " " << iref 756c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes << " (should be " << checkRef << ")"; 766c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes AbortMaybe(); 776c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 786c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 796c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return true; 806c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 816c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 82cf4c6c41b0084dc4567ff709fb8ce9ebd72b26acElliott HughesIndirectRef IndirectReferenceTable::Add(uint32_t cookie, const Object* obj) { 836c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes IRTSegmentState prevState; 846c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes prevState.all = cookie; 85dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers size_t topIndex = segment_state_.parts.topIndex; 866c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 876c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK(obj != NULL); 88cdd1d2d3fee0711b8b11db99f2dfb80113520100Ian Rogers // TODO: stronger sanity check on the object (such as in heap) 89395520eaa47eca25b92e86188accf3095d60af49Brian Carlstrom DCHECK(IsAligned(reinterpret_cast<intptr_t>(obj), 8)) << reinterpret_cast<const void*>(obj); 906c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK(table_ != NULL); 916c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK_LE(alloc_entries_, max_entries_); 92dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers DCHECK_GE(segment_state_.parts.numHoles, prevState.parts.numHoles); 936c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 946c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (topIndex == alloc_entries_) { 956c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes /* reached end of allocated space; did we hit buffer max? */ 966c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (topIndex == max_entries_) { 976c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(ERROR) << "JNI ERROR (app bug): " << kind_ << " table overflow " 986c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes << "(max=" << max_entries_ << ")"; 996c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes Dump(); 1006c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(FATAL); // TODO: operator<< for IndirectReferenceTable 1016c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 1026c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 1036c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes size_t newSize = alloc_entries_ * 2; 1046c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (newSize > max_entries_) { 1056c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes newSize = max_entries_; 1066c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 1076c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK_GT(newSize, alloc_entries_); 1086c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 109cf4c6c41b0084dc4567ff709fb8ce9ebd72b26acElliott Hughes table_ = (const Object**) realloc(table_, newSize * sizeof(const Object*)); 1106c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes slot_data_ = (IndirectRefSlot*) realloc(slot_data_, newSize * sizeof(IndirectRefSlot)); 1116c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (table_ == NULL || slot_data_ == NULL) { 1126c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(ERROR) << "JNI ERROR (app bug): unable to expand " 1136c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes << kind_ << " table (from " 1146c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes << alloc_entries_ << " to " << newSize 1156c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes << ", max=" << max_entries_ << ")"; 1166c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes Dump(); 1176c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(FATAL); // TODO: operator<< for IndirectReferenceTable 1186c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 1196c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 1206c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes // Clear the newly-allocated slot_data_ elements. 1216c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes memset(slot_data_ + alloc_entries_, 0, (newSize - alloc_entries_) * sizeof(IndirectRefSlot)); 1226c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 1236c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes alloc_entries_ = newSize; 1246c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 1256c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 1266c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes /* 1276c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * We know there's enough room in the table. Now we just need to find 1286c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * the right spot. If there's a hole, find it and fill it; otherwise, 1296c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * add to the end of the list. 1306c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes */ 1316c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes IndirectRef result; 132dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers int numHoles = segment_state_.parts.numHoles - prevState.parts.numHoles; 1336c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (numHoles > 0) { 1346c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK_GT(topIndex, 1U); 1356c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes /* find the first hole; likely to be near the end of the list */ 136cf4c6c41b0084dc4567ff709fb8ce9ebd72b26acElliott Hughes const Object** pScan = &table_[topIndex - 1]; 1376c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK(*pScan != NULL); 1386c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes while (*--pScan != NULL) { 1396c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK_GE(pScan, table_ + prevState.parts.topIndex); 1406c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 1416c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes UpdateSlotAdd(obj, pScan - table_); 1426c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes result = ToIndirectRef(obj, pScan - table_); 1436c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes *pScan = obj; 144dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers segment_state_.parts.numHoles--; 1456c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } else { 1466c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes /* add to the end */ 1476c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes UpdateSlotAdd(obj, topIndex); 1486c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes result = ToIndirectRef(obj, topIndex); 1496c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes table_[topIndex++] = obj; 150dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers segment_state_.parts.topIndex = topIndex; 1516c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 1525a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers if (false) { 1535a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers LOG(INFO) << "+++ added at " << ExtractIndex(result) << " top=" << segment_state_.parts.topIndex 1545a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers << " holes=" << segment_state_.parts.numHoles; 1555a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers } 1566c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 1576c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK(result != NULL); 1586c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return result; 1596c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 1606c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 161726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughesvoid IndirectReferenceTable::AssertEmpty() { 162726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes if (begin() != end()) { 163726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes Dump(); 164726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes LOG(FATAL) << "Internal Error: non-empty local reference table"; 165726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes } 166726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes} 167726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes 1686c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes/* 1696c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Verify that the indirect table lookup is valid. 1706c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * 1716c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Returns "false" if something looks bad. 1726c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes */ 1736c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughesbool IndirectReferenceTable::GetChecked(IndirectRef iref) const { 1746c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (iref == NULL) { 1756c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(WARNING) << "Attempt to look up NULL " << kind_; 1766c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 1776c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 178408f79aeb676251ba35667a64e86c20638d7cb0bIan Rogers if (GetIndirectRefKind(iref) == kSirtOrInvalid) { 1796c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(ERROR) << "JNI ERROR (app bug): invalid " << kind_ << " " << iref; 1806c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes AbortMaybe(); 1816c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 1826c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 1836c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 184dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers int topIndex = segment_state_.parts.topIndex; 1856c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes int idx = ExtractIndex(iref); 1866c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (idx >= topIndex) { 1876c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes /* bad -- stale reference? */ 1885a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers LOG(ERROR) << "JNI ERROR (app bug): accessed stale " << kind_ << " " 1895a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers << iref << " (index " << idx << " in a table of size " << topIndex << ")"; 1906c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes AbortMaybe(); 1916c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 1926c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 1936c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 1946c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (table_[idx] == NULL) { 1956c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(ERROR) << "JNI ERROR (app bug): accessed deleted " << kind_ << " " << iref; 1966c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes AbortMaybe(); 1976c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 1986c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 1996c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 2006c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (!CheckEntry("use", iref, idx)) { 2016c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 2026c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 2036c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 2046c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return true; 2056c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 2066c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 207cf4c6c41b0084dc4567ff709fb8ce9ebd72b26acElliott Hughesstatic int LinearScan(IndirectRef iref, int bottomIndex, int topIndex, const Object** table) { 2086c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes for (int i = bottomIndex; i < topIndex; ++i) { 209cf4c6c41b0084dc4567ff709fb8ce9ebd72b26acElliott Hughes if (table[i] == reinterpret_cast<const Object*>(iref)) { 2106c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return i; 2116c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 2126c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 2136c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return -1; 2146c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 2156c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 2166c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughesbool IndirectReferenceTable::Contains(IndirectRef iref) const { 217dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers return LinearScan(iref, 0, segment_state_.parts.topIndex, table_) != -1; 2186c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 2196c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 2206c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes/* 2216c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Remove "obj" from "pRef". We extract the table offset bits from "iref" 2226c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * and zap the corresponding entry, leaving a hole if it's not at the top. 2236c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * 2246c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * If the entry is not between the current top index and the bottom index 2256c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * specified by the cookie, we don't remove anything. This is the behavior 2266c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * required by JNI's DeleteLocalRef function. 2276c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * 2286c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Note this is NOT called when a local frame is popped. This is only used 2296c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * for explicit single removals. 2306c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * 2316c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Returns "false" if nothing was removed. 2326c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes */ 2336c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughesbool IndirectReferenceTable::Remove(uint32_t cookie, IndirectRef iref) { 2346c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes IRTSegmentState prevState; 2356c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes prevState.all = cookie; 236dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers int topIndex = segment_state_.parts.topIndex; 2376c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes int bottomIndex = prevState.parts.topIndex; 2386c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 2396c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK(table_ != NULL); 2406c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes DCHECK_LE(alloc_entries_, max_entries_); 241dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers DCHECK_GE(segment_state_.parts.numHoles, prevState.parts.numHoles); 2426c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 2436c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes int idx = ExtractIndex(iref); 2446c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 245c5bfa8f49d8548d7c685a99b411311ef56bedffaElliott Hughes JavaVMExt* vm = Runtime::Current()->GetJavaVM(); 2465a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers if (GetIndirectRefKind(iref) == kSirtOrInvalid && 2475a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers Thread::Current()->SirtContains(reinterpret_cast<jobject>(iref))) { 2485a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers LOG(WARNING) << "Attempt to remove local SIRT entry from IRT, ignoring"; 2495a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers return true; 2505a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers } 251c5bfa8f49d8548d7c685a99b411311ef56bedffaElliott Hughes if (GetIndirectRefKind(iref) == kSirtOrInvalid || vm->work_around_app_jni_bugs) { 2526c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes idx = LinearScan(iref, bottomIndex, topIndex, table_); 2536c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (idx == -1) { 2546c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(WARNING) << "trying to work around app JNI bugs, but didn't find " << iref << " in table!"; 2556c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 2566c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 2576c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 2586c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 2596c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (idx < bottomIndex) { 260726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes // Wrong segment. 261726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes LOG(WARNING) << "Attempt to remove index outside index area (" << idx 262726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes << " vs " << bottomIndex << "-" << topIndex << ")"; 2636c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 2646c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 2656c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (idx >= topIndex) { 266726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes // Bad --- stale reference? 267726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes LOG(WARNING) << "Attempt to remove invalid index " << idx 268726079d3e2e50854cd6ca4c393f4529a796dba58Elliott Hughes << " (bottom=" << bottomIndex << " top=" << topIndex << ")"; 2696c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 2706c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 2716c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 2726c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (idx == topIndex-1) { 2736c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes // Top-most entry. Scan up and consume holes. 2746c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 275c5bfa8f49d8548d7c685a99b411311ef56bedffaElliott Hughes if (!vm->work_around_app_jni_bugs && !CheckEntry("remove", iref, idx)) { 2766c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 2776c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 2786c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 2796c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes table_[idx] = NULL; 280dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers int numHoles = segment_state_.parts.numHoles - prevState.parts.numHoles; 2816c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (numHoles != 0) { 2826c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes while (--topIndex > bottomIndex && numHoles != 0) { 2835a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers if (false) { 2845a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers LOG(INFO) << "+++ checking for hole at " << topIndex-1 2855a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers << " (cookie=" << cookie << ") val=" << table_[topIndex - 1]; 2865a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers } 2876c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (table_[topIndex-1] != NULL) { 2886c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes break; 2896c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 2905a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers if (false) { 2915a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers LOG(INFO) << "+++ ate hole at " << (topIndex - 1); 2925a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers } 2936c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes numHoles--; 2946c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 295dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers segment_state_.parts.numHoles = numHoles + prevState.parts.numHoles; 296dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers segment_state_.parts.topIndex = topIndex; 2976c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } else { 298dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers segment_state_.parts.topIndex = topIndex-1; 2995a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers if (false) { 3005a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers LOG(INFO) << "+++ ate last entry " << topIndex - 1; 3015a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers } 3026c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 3036c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } else { 3046c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes /* 3056c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * Not the top-most entry. This creates a hole. We NULL out the 3066c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * entry to prevent somebody from deleting it twice and screwing up 3076c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes * the hole count. 3086c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes */ 3096c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes if (table_[idx] == NULL) { 3106c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(INFO) << "--- WEIRD: removing null entry " << idx; 3116c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 3126c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 313c5bfa8f49d8548d7c685a99b411311ef56bedffaElliott Hughes if (!vm->work_around_app_jni_bugs && !CheckEntry("remove", iref, idx)) { 3146c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return false; 3156c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 3166c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 3176c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes table_[idx] = NULL; 318dc51b79e65abcdad094ccd5e5a2caf5153433d49Ian Rogers segment_state_.parts.numHoles++; 3195a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers if (false) { 3205a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers LOG(INFO) << "+++ left hole at " << idx << ", holes=" << segment_state_.parts.numHoles; 3215a7a74a042e73a355f5cedffa0d2faf5340028faIan Rogers } 3226c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 3236c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 3246c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return true; 3256c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 3266c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 327410c0c876f326e14c176a39ba21fc4dd3f7db8abElliott Hughesvoid IndirectReferenceTable::VisitRoots(Heap::RootVisitor* visitor, void* arg) { 328410c0c876f326e14c176a39ba21fc4dd3f7db8abElliott Hughes typedef IndirectReferenceTable::iterator It; // TODO: C++0x auto 329410c0c876f326e14c176a39ba21fc4dd3f7db8abElliott Hughes for (It it = begin(), end = this->end(); it != end; ++it) { 330410c0c876f326e14c176a39ba21fc4dd3f7db8abElliott Hughes visitor(**it, arg); 331410c0c876f326e14c176a39ba21fc4dd3f7db8abElliott Hughes } 332410c0c876f326e14c176a39ba21fc4dd3f7db8abElliott Hughes} 333410c0c876f326e14c176a39ba21fc4dd3f7db8abElliott Hughes 3346c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughesstd::ostream& operator<<(std::ostream& os, IndirectRefKind rhs) { 3356c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes switch (rhs) { 336408f79aeb676251ba35667a64e86c20638d7cb0bIan Rogers case kSirtOrInvalid: 337408f79aeb676251ba35667a64e86c20638d7cb0bIan Rogers os << "stack indirect reference table or invalid reference"; 3386c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes break; 3396c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes case kLocal: 3406c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes os << "local reference"; 3416c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes break; 3426c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes case kGlobal: 3436c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes os << "global reference"; 3446c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes break; 3456c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes case kWeakGlobal: 3466c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes os << "weak global reference"; 3476c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes break; 3486c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes default: 3496c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes os << "IndirectRefKind[" << static_cast<int>(rhs) << "]"; 3506c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes break; 3516c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes } 3526c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes return os; 3536c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 3546c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 3556c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughesvoid IndirectReferenceTable::Dump() const { 3566c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes LOG(WARNING) << kind_ << " table dump:"; 3577577075b147fd8fa37ca41e7a32d1124676776ceElliott Hughes std::vector<const Object*> entries(table_, table_ + Capacity()); 3586c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes ReferenceTable::Dump(entries); 3596c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} 3606c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes 3616c1a394b47c85c8d1723fc3b156a3b1b0b29a757Elliott Hughes} // namespace art 362