mem_map.h revision 6e6078ab06e16bb4032b363316360f3b76685e30
1db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom/* 2db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * Copyright (C) 2008 The Android Open Source Project 3db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * 4db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * Licensed under the Apache License, Version 2.0 (the "License"); 5db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * you may not use this file except in compliance with the License. 6db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * You may obtain a copy of the License at 7db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * 8db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * http://www.apache.org/licenses/LICENSE-2.0 9db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * 10db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * Unless required by applicable law or agreed to in writing, software 11db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * distributed under the License is distributed on an "AS IS" BASIS, 12db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * See the License for the specific language governing permissions and 14db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom * limitations under the License. 15db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom */ 16db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 17fc0e3219edc9a5bf81b166e82fd5db2796eb6a0dBrian Carlstrom#ifndef ART_RUNTIME_MEM_MAP_H_ 18fc0e3219edc9a5bf81b166e82fd5db2796eb6a0dBrian Carlstrom#define ART_RUNTIME_MEM_MAP_H_ 19db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 203eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi#include "base/mutex.h" 213eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 221c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier#include <string> 233eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi#include <map> 241c23e1edb7361bbaec6e57fca86d8d3797960ad2Mathieu Chartier 2527ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom#include <stddef.h> 26a168c83a1d247094e9efb1244b0f73a5f1e1ed97Elliott Hughes#include <sys/mman.h> // For the PROT_* and MAP_* constants. 2727ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom#include <sys/types.h> 28db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 29bad0267eaab9d6a522d05469ff90501deefdb88bMathieu Chartier#include "base/allocator.h" 3027ec961a1da540ba7f16c07a682585ab167317adBrian Carlstrom#include "globals.h" 31db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 32db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstromnamespace art { 33db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 34c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#if defined(__LP64__) && (!defined(__x86_64__) || defined(__APPLE__)) 35c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#define USE_ART_LOW_4G_ALLOCATOR 1 36c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#else 37c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#define USE_ART_LOW_4G_ALLOCATOR 0 38c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#endif 39c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers 40c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers#ifdef __linux__ 41c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogersstatic constexpr bool kMadviseZeroes = true; 42c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers#else 43c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogersstatic constexpr bool kMadviseZeroes = false; 44c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers#endif 45c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers 46db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom// Used to keep track of mmap segments. 47d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// 48d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// On 64b systems not supporting MAP_32BIT, the implementation of MemMap will do a linear scan 49d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// for free pages. For security, the start of this scan should be randomized. This requires a 50d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// dynamic initializer. 51d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// For this to work, it is paramount that there are no other static initializers that access MemMap. 52d8f26dbebe72c1cbdfa85bdeeb003283c7435db3Andreas Gampe// Otherwise, calls might see uninitialized values. 53db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstromclass MemMap { 54db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom public: 55ecd3a6fc6e29d7dc4cb825c5282a8054ac52b8cfElliott Hughes // Request an anonymous region of length 'byte_count' and a requested base address. 562cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier // Use null as the requested base address if you don't care. 575c42c29b89286e5efa4a4613132b09051ce5945bVladimir Marko // "reuse" allows re-mapping an address range from an existing mapping. 586c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes // 596c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes // The word "anonymous" in this context means "not backed by a file". The supplied 60a25dce9b452ba17ef7cef768926c884177a3025eNicolas Geoffray // 'name' will be used -- on systems that support it -- to give the mapping 616c9c06dbb0b16714079afaedbebd3d548aa832b2Elliott Hughes // a name. 624a289ed61242964b921434de7d375f46480472a1Brian Carlstrom // 632cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier // On success, returns returns a MemMap instance. On failure, returns null. 64a25dce9b452ba17ef7cef768926c884177a3025eNicolas Geoffray static MemMap* MapAnonymous(const char* name, 6542bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier uint8_t* addr, 6642bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier size_t byte_count, 6742bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int prot, 6842bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier bool low_4gb, 6942bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier bool reuse, 70a25dce9b452ba17ef7cef768926c884177a3025eNicolas Geoffray std::string* error_msg, 713071f80075de7ecc434b668bfc4b3f3e09cdc8fdBilyan Borisov bool use_ashmem = !kIsTargetLinux); 72db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 731baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky // Create placeholder for a region allocated by direct call to mmap. 741baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky // This is useful when we do not have control over the code calling mmap, 751baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky // but when we still want to keep track of it in the list. 761baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky // The region is not considered to be owned and will not be unmmaped. 771baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky static MemMap* MapDummy(const char* name, uint8_t* addr, size_t byte_count); 781baabf0726eb285284e0c908ccba9f209b399faeDavid Srbecky 79db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom // Map part of a file, taking care of non-page aligned offsets. The 80db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom // "start" offset is absolute, not relative. 81db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom // 822cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier // On success, returns returns a MemMap instance. On failure, returns null. 8342bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier static MemMap* MapFile(size_t byte_count, 8442bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int prot, 8542bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int flags, 8642bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int fd, 8742bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier off_t start, 8842bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier bool low_4gb, 8942bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier const char* filename, 9042bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier std::string* error_msg) { 9142bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier return MapFileAtAddress(nullptr, 9242bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier byte_count, 9342bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier prot, 9442bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier flags, 9542bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier fd, 9642bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier start, 9742bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier /*low_4gb*/low_4gb, 9842bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier /*reuse*/false, 9942bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier filename, 10042bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier error_msg); 1014a289ed61242964b921434de7d375f46480472a1Brian Carlstrom } 1024a289ed61242964b921434de7d375f46480472a1Brian Carlstrom 103ebe2dfcb1346d2010787ebbb15ae2965fcd2b223Mathieu Chartier // Map part of a file, taking care of non-page aligned offsets. The "start" offset is absolute, 104ebe2dfcb1346d2010787ebbb15ae2965fcd2b223Mathieu Chartier // not relative. This version allows requesting a specific address for the base of the mapping. 105ebe2dfcb1346d2010787ebbb15ae2965fcd2b223Mathieu Chartier // "reuse" allows us to create a view into an existing mapping where we do not take ownership of 106ebe2dfcb1346d2010787ebbb15ae2965fcd2b223Mathieu Chartier // the memory. If error_msg is null then we do not print /proc/maps to the log if 107ebe2dfcb1346d2010787ebbb15ae2965fcd2b223Mathieu Chartier // MapFileAtAddress fails. This helps improve performance of the fail case since reading and 108ebe2dfcb1346d2010787ebbb15ae2965fcd2b223Mathieu Chartier // printing /proc/maps takes several milliseconds in the worst case. 1094a289ed61242964b921434de7d375f46480472a1Brian Carlstrom // 1102cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier // On success, returns returns a MemMap instance. On failure, returns null. 11142bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier static MemMap* MapFileAtAddress(uint8_t* addr, 11242bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier size_t byte_count, 11342bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int prot, 11442bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int flags, 11542bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int fd, 11642bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier off_t start, 11742bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier bool low_4gb, 11842bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier bool reuse, 11942bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier const char* filename, 1208d31bbd3d6536de12bc20e3d29cfe03fe848f9daIan Rogers std::string* error_msg); 121db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 1222cebb24bfc3247d3e9be138a3350106737455918Mathieu Chartier // Releases the memory mapping. 12390443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier ~MemMap() REQUIRES(!Locks::mem_maps_lock_); 124db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 1250d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom const std::string& GetName() const { 1260d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom return name_; 1270d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom } 1280d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom 1299bdf108885a27ba05fae8501725649574d7c491bVladimir Marko bool Sync(); 1309bdf108885a27ba05fae8501725649574d7c491bVladimir Marko 131d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien bool Protect(int prot); 132d88fa26892ad5ddebb7ab3407cdc574c54ed8258Logan Chien 133c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers void MadviseDontNeedAndZero(); 134c5f17732d8144491c642776b6b48c85dfadf4b52Ian Rogers 1351c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers int GetProtect() const { 1361c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers return prot_; 1371c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers } 1381c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers 13913735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* Begin() const { 14030fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers return begin_; 141db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom } 142db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 14330fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers size_t Size() const { 14430fab40ee5a07af6b8c3b6b0e9438071695a57f4Ian Rogers return size_; 145db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom } 146db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 147379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier // Resize the mem-map by unmapping pages at the end. Currently only supports shrinking. 148379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier void SetSize(size_t new_size); 149379d09fe3c3feb7c2a2fb5a3623689b5ace7e79bMathieu Chartier 15013735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* End() const { 1512fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier return Begin() + Size(); 1522fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier } 1532fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier 1540d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom void* BaseBegin() const { 1550d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom return base_begin_; 1560d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom } 1570d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom 1580d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom size_t BaseSize() const { 1590d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom return base_size_; 1600d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom } 1610d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom 1620d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom void* BaseEnd() const { 16313735955f39b3b304c37d2b2840663c131262c18Ian Rogers return reinterpret_cast<uint8_t*>(BaseBegin()) + BaseSize(); 1640d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom } 1650d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstrom 1662fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier bool HasAddress(const void* addr) const { 1672fde53367dbe721e5273c34b590e67112322cc9eMathieu Chartier return Begin() <= addr && addr < End(); 168b765be0d656c3073402693aeaf64e95a0e49f218Brian Carlstrom } 169b765be0d656c3073402693aeaf64e95a0e49f218Brian Carlstrom 170fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi // Unmap the pages at end and remap them to create another memory map. 17142bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier MemMap* RemapAtEnd(uint8_t* new_end, 17242bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier const char* tail_name, 17342bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int tail_prot, 174a25dce9b452ba17ef7cef768926c884177a3025eNicolas Geoffray std::string* error_msg, 1753071f80075de7ecc434b668bfc4b3f3e09cdc8fdBilyan Borisov bool use_ashmem = !kIsTargetLinux); 176cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier 1773eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi static bool CheckNoGaps(MemMap* begin_map, MemMap* end_map) 17890443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(!Locks::mem_maps_lock_); 17917a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko static void DumpMaps(std::ostream& os, bool terse = false) 18090443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(!Locks::mem_maps_lock_); 1813eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 182bad0267eaab9d6a522d05469ff90501deefdb88bMathieu Chartier typedef AllocationTrackingMultiMap<void*, MemMap*, kAllocatorTagMaps> Maps; 183bad0267eaab9d6a522d05469ff90501deefdb88bMathieu Chartier 18490443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier static void Init() REQUIRES(!Locks::mem_maps_lock_); 18590443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier static void Shutdown() REQUIRES(!Locks::mem_maps_lock_); 1866e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier 1876edb9aecdbe8b31f7ae1d35f21d013631337a424Hiroshi Yamauchi // If the map is PROT_READ, try to read each page of the map to check it is in fact readable (not 1886edb9aecdbe8b31f7ae1d35f21d013631337a424Hiroshi Yamauchi // faulting). This is used to diagnose a bug b/19894268 where mprotect doesn't seem to be working 1896edb9aecdbe8b31f7ae1d35f21d013631337a424Hiroshi Yamauchi // intermittently. 1906edb9aecdbe8b31f7ae1d35f21d013631337a424Hiroshi Yamauchi void TryReadable(); 1916edb9aecdbe8b31f7ae1d35f21d013631337a424Hiroshi Yamauchi 192db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom private: 19342bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier MemMap(const std::string& name, 19442bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier uint8_t* begin, 19542bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier size_t size, 19642bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier void* base_begin, 19742bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier size_t base_size, 19842bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int prot, 19942bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier bool reuse, 20042bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier size_t redzone_size = 0) REQUIRES(!Locks::mem_maps_lock_); 2013eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 20217a924abde2b0f1f37f6008b451a0a75190c71ffVladimir Marko static void DumpMapsLocked(std::ostream& os, bool terse) 20390443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::mem_maps_lock_); 2043eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi static bool HasMemMap(MemMap* map) 20590443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::mem_maps_lock_); 2063eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi static MemMap* GetLargestMemMapAt(void* address) 20790443477f9a0061581c420775ce3b7eeae7468bcMathieu Chartier REQUIRES(Locks::mem_maps_lock_); 208e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier static bool ContainedWithinExistingMap(uint8_t* ptr, size_t size, std::string* error_msg) 209e58991b3b2282b5761f1a6023a16c803e1c4eb45Mathieu Chartier REQUIRES(!Locks::mem_maps_lock_); 210db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 21142bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier // Internal version of mmap that supports low 4gb emulation. 21242bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier static void* MapInternal(void* addr, 21342bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier size_t length, 21442bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int prot, 21542bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int flags, 21642bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier int fd, 21742bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier off_t offset, 21842bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier bool low_4gb); 21942bddcec51e71d206f6d3b30a881ee6c1d50a63cMathieu Chartier 220a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo const std::string name_; 22113735955f39b3b304c37d2b2840663c131262c18Ian Rogers uint8_t* const begin_; // Start of data. 222cc236d74772dda5a4161d9bc5f497fd3d956eb87Mathieu Chartier size_t size_; // Length of data. 223db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 2241c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers void* const base_begin_; // Page-aligned base address. 225fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi size_t base_size_; // Length of mapping. May be changed by RemapAtEnd (ie Zygote). 2261c849e5badc85b6753dee0c0487729b2c0529f51Ian Rogers int prot_; // Protection of the map. 227fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi 228a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo // When reuse_ is true, this is just a view of an existing mapping 229a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo // and we do not take ownership and are not responsible for 230a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo // unmapping. 231a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo const bool reuse_; 232a62a588a9202f69e53fbeb3045ea8ea5ec2587f8Jim_Guo 2331e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov const size_t redzone_size_; 2341e13374baf7dfaf442ffbf9809c37c131d681eafEvgenii Stepanov 235c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers#if USE_ART_LOW_4G_ALLOCATOR 236c3ccc1039e0bbc0744f958cb8719cf96bce5b853Ian Rogers static uintptr_t next_mem_pos_; // Next memory location to check for low_4g extent. 2378dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith#endif 2388dba5aaaffc0bc2b2580bf02f0d9095c00d26a17Stuart Monteith 2393eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi // All the non-empty MemMaps. Use a multimap as we do a reserve-and-divide (eg ElfMap::Load()). 2406e88ef6b604a7a945a466784580c42e6554c1289Mathieu Chartier static Maps* maps_ GUARDED_BY(Locks::mem_maps_lock_); 2413eed93dd5be03e5539827bebf0f414251a12e15eHiroshi Yamauchi 242fd7e7f1253927c8d7f17e7cbc259daaf51868bd3Hiroshi Yamauchi friend class MemMapTest; // To allow access to base_begin_ and base_size_. 243db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom}; 2446e6078ab06e16bb4032b363316360f3b76685e30Mathieu Chartier 2450d6adac2550113da33d42e88f0d87a57b25c5a60Brian Carlstromstd::ostream& operator<<(std::ostream& os, const MemMap& mem_map); 246277ccbd200ea43590dfc06a93ae184a765327ad0Andreas Gampestd::ostream& operator<<(std::ostream& os, const MemMap::Maps& mem_maps); 247db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 2486e6078ab06e16bb4032b363316360f3b76685e30Mathieu Chartier// Zero and release pages if possible, no requirements on alignments. 2496e6078ab06e16bb4032b363316360f3b76685e30Mathieu Chartiervoid ZeroAndReleasePages(void* address, size_t length); 2506e6078ab06e16bb4032b363316360f3b76685e30Mathieu Chartier 251db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom} // namespace art 252db4d54081f09abcbe97ffdf615874f2809a9e777Brian Carlstrom 253fc0e3219edc9a5bf81b166e82fd5db2796eb6a0dBrian Carlstrom#endif // ART_RUNTIME_MEM_MAP_H_ 254