128 lines
4.6 KiB
C++
128 lines
4.6 KiB
C++
// Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CHROMIUMOS_WIDE_PROFILING_ADDRESS_MAPPER_H_
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#define CHROMIUMOS_WIDE_PROFILING_ADDRESS_MAPPER_H_
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#include <stdint.h>
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#include <list>
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namespace quipper {
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class AddressMapper {
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public:
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AddressMapper() {}
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// Copy constructor: copies mappings from |source| to this AddressMapper. This
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// is useful for copying mappings from parent to child process upon fork(). It
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// is also useful to copy kernel mappings to any process that is created.
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AddressMapper(const AddressMapper& source);
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// Maps a new address range to quipper space.
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// |remove_existing_mappings| indicates whether to remove old mappings that
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// collide with the new range in real address space, indicating it has been
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// unmapped.
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// Returns true if mapping was successful.
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bool Map(const uint64_t real_addr,
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const uint64_t length,
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bool remove_existing_mappings);
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// Like Map(real_addr, length, remove_existing_mappings). |id| is an
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// identifier value to be stored along with the mapping. AddressMapper does
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// not care whether it is unique compared to all other IDs passed in. That is
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// up to the caller to keep track of.
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// |offset_base| represents the offset within the original region at which the
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// mapping begins. The original region can be much larger than the mapped
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// region.
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// e.g. Given a mapped region with base=0x4000 and size=0x2000 mapped with
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// offset_base=0x10000, then the address 0x5000 maps to an offset of 0x11000
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// (0x5000 - 0x4000 + 0x10000).
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bool MapWithID(const uint64_t real_addr,
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const uint64_t length,
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const uint64_t id,
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const uint64_t offset_base,
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bool remove_existing_mappings);
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// Looks up |real_addr| and returns the mapped address.
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bool GetMappedAddress(const uint64_t real_addr, uint64_t* mapped_addr) const;
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// Looks up |real_addr| and returns the mapping's ID and offset from the
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// start of the mapped space.
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bool GetMappedIDAndOffset(const uint64_t real_addr,
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uint64_t* id,
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uint64_t* offset) const;
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// Returns true if there are no mappings.
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bool IsEmpty() const {
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return mappings_.empty();
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}
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// Returns the number of address ranges that are currently mapped.
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unsigned int GetNumMappedRanges() const {
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return mappings_.size();
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}
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// Returns the maximum length of quipper space containing mapped areas.
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// There may be gaps in between blocks.
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// If the result is 2^64 (all of quipper space), this returns 0. Call
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// IsEmpty() to distinguish this from actual emptiness.
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uint64_t GetMaxMappedLength() const;
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// Dumps the state of the address mapper to logs. Useful for debugging.
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void DumpToLog() const;
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private:
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struct MappedRange {
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uint64_t real_addr;
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uint64_t mapped_addr;
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uint64_t size;
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uint64_t id;
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uint64_t offset_base;
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// Length of unmapped space after this range.
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uint64_t unmapped_space_after;
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// Determines if this range intersects another range in real space.
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inline bool Intersects(const MappedRange& range) const {
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return (real_addr <= range.real_addr + range.size - 1) &&
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(real_addr + size - 1 >= range.real_addr);
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}
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// Determines if this range fully covers another range in real space.
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inline bool Covers(const MappedRange& range) const {
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return (real_addr <= range.real_addr) &&
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(real_addr + size - 1 >= range.real_addr + range.size - 1);
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}
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// Determines if this range fully contains another range in real space.
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// This is different from Covers() in that the boundaries cannot overlap.
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inline bool Contains(const MappedRange& range) const {
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return (real_addr < range.real_addr) &&
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(real_addr + size - 1 > range.real_addr + range.size - 1);
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}
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// Determines if this range contains the given address |addr|.
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inline bool ContainsAddress(uint64_t addr) const {
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return (addr >= real_addr && addr <= real_addr + size - 1);
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}
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};
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// TODO(sque): implement with set or map to improve searching.
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typedef std::list<MappedRange> MappingList;
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// Removes an existing address mapping.
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// Returns true if successful, false if no mapped address range was found.
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bool Unmap(const MappedRange& range);
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// Container for all the existing mappings.
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MappingList mappings_;
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bool CheckMappings() const;
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};
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} // namespace quipper
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#endif // CHROMIUMOS_WIDE_PROFILING_ADDRESS_MAPPER_H_
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