mirror of https://github.com/acidanthera/audk.git
cf556c6a58
edk2 should have a fast and easy-to-use associative array (a dictionary) type. Red-black trees have O(log(n)) worst case time complexity for lookup, insertion, and deletion (where n is the number of nodes in the tree). They support minimum and maximum lookup with the same time complexity, hence red-black trees double as priority queues as well. Given an iterator to a red-black tree node, getting the next or previous node (which corresponds to the ordered successor or the predecessor, respectively, according to the user-defined ordering) is O(log(n)) as well. The code reflects the Binary Search Trees and Red-Black Trees chapters of Introduction to Algorithms, by Cormen, Leiserson, Rivest. One point where the implementation diverges is the first phase of the Delete() operation. During that phase, the book's algorithm copies the key and other business *contents* of the successor node (in case the successor node is affected), and releases the successor node (instead of the node that the user requested to delete). While semantically correct, this would break the above iterator validity guarantee. This implementation replaces the copying of business contents between nodes with suitable relinking of nodes, so that all iterators (except the one whose deletion is being requested) remain valid. I had written this code originally in approx. 2002. I personally own the copyright of that version and am hereby relicensing it to Red Hat, under the BSDL. I had used the original code in a few personal projects since, for example in the lbzip2-0.x parallel (de)compressor, and now I've ported the library to edk2. Both during the original implementation and now during the porting I verified all the cases and their proofs as rigorously as I could, on paper. (NB, I couldn't find any errors in the 2002 code now.) During the porting to edk2, I documented all those cases in code comments as well (at least half of the source is documentation). These comments are not blind copies of diagrams from the Algorithms book, nor are they copies from my original code -- I've done them all fresh now, and I've only matched the results against the book. Reviewers are invited to sit down with a pen, some paper, the book, and the code. The Validate() function verifies the internal red-black properties of the tree. This function helps with unit testing, and is only invoked when requested with the PcdValidateOrderedCollection feature flag. A note about diagrams: edges represented by backslash (\) characters are often written as "\_", ie. with a following underscore. This is because line-trailing backslashes are processed very early in compilation (in translation phase 2), "splicing physical source lines to form logical source lines". Since the edk2 coding style requires "//" comments for such documentation, a trailing backslash would splice the next physical line into the "scope" of the comment. To prevent this, trailing backslashes are defanged by appending underscores, which should be visually bearable. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Michael Kinney <michael.d.kinney@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15791 6f19259b-4bc3-4df7-8a09-765794883524 |
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| AppPkg | ||
| ArmPkg | ||
| ArmPlatformPkg | ||
| BaseTools | ||
| BeagleBoardPkg | ||
| Conf | ||
| CryptoPkg | ||
| DuetPkg | ||
| EdkCompatibilityPkg | ||
| EdkShellBinPkg | ||
| EdkShellPkg | ||
| EmbeddedPkg | ||
| EmulatorPkg | ||
| FatBinPkg | ||
| IntelFrameworkModulePkg | ||
| IntelFrameworkPkg | ||
| IntelFspPkg | ||
| IntelFspWrapperPkg | ||
| MdeModulePkg | ||
| MdePkg | ||
| NetworkPkg | ||
| Nt32Pkg | ||
| Omap35xxPkg | ||
| OptionRomPkg | ||
| OvmfPkg | ||
| PcAtChipsetPkg | ||
| PerformancePkg | ||
| SecurityPkg | ||
| ShellBinPkg | ||
| ShellPkg | ||
| SourceLevelDebugPkg | ||
| StdLib | ||
| StdLibPrivateInternalFiles | ||
| UefiCpuPkg | ||
| UnixPkg | ||
| BuildNotes2.txt | ||
| edksetup.bat | ||
| edksetup.sh | ||