Xcode Make Sure a Valid Revision Exists in the Repository and Try Again

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pstore is a lightweight persistent suspend-merely key/value store intended for utilize equally a back-terminate for the LLVM Program Repository.

Its design goals are:

  • Operation approaching that of an in-memory hash table
  • Good back up for parallel compilations
  • Multiple indices
  • In-procedure

Table of Contents

  • Building pstore
    • Prerequisites
    • Building
      • Standalone
      • Inside LLVM
  • Getting started
    • Using the read and write utilities

Edifice pstore

Prerequisites

pstore is built and tested on a variety of platforms:

  • Ubuntu Linux twenty.04.3 LTS: edifice with GCC 7.5.0, GCC 10.three.0, Clang eight.0.1, and Clang 12.0.0. We too build with the official GCC 5.5.0 docker image.
  • macOS: building with Xcode xiii.two
  • Windows: edifice with Visual Studio 2019 and 2022

In addition, there's support for FreeBSD 11, NetBSD nine.1, and Solaris 11.4.

To build it, yous'll also demand the following tools:

  • cmake (version iii.4 or after, version three.8 or later if using Visual Studio)

Optionally:

  • Doxygen for building the documentation
  • GraphViz for graph rendering
  • Node.js for the ElectronJS-based broker dashboard and some system tests.
  • Python 2.7 or later for running the organization tests besides as a few utilities
  • Valgrind for actress validation of the executables (enabled past passing the -D PSTORE_VALGRIND=Yeah argument when running cmake to generate the build)

Building

pstore may be built either every bit a standalone collection of libraries, header files, and utilities or as a project within the LLVM framework.

Standalone

The pstore build organisation uses cmake. If you're not very familiar with cmake, there's a small utility (found in utils/make_build.py) which will create an out-of-tree directory in which to build the project and run cmake with the correct arguments for your platform.

python ./utils/make_build.py cmake ‑‑build build_linux

The build directory volition be one of build_linux, build_mac, build_win32, and then on.

Inside LLVM

Make sure that pstore is located within the llvm-projection directory tree. For example, to build pstore inside LLVM with Program Repository Support (llvm-project-prepo):

git clone http://github.com/SNSystems/llvm-project-prepo.git              cd              llvm git clone http://github.com/SNSystems/pstore.git              cd              -

Build LLVM as normal enabling the pstore subproject in improver to whatever others. For example:

mkdir build              cd              build cmake -G Ninja \       -D LLVM_ENABLE_PROJECTS=                "clang;pstore"                            \       -D LLVM_TARGETS_TO_BUILD=X86 \       -D LLVM_TOOL_CLANG_TOOLS_EXTRA_BUILD=Off \       ../llvm ninja

Getting started

Using the read and write utilities

The pstore-read and pstore-write tools provide a simple way to experiment with the capabilities of the pstore library. Consider the post-obit exchange:

$              echo              foo              >              foo.txt $              echo              bar              >              bar.txt $ pstore-write --add together-file mykey,foo.txt pstore.db $ pstore-read pstore.db mykey foo $ pstore-write --add together-file mykey,bar.txt pstore.db $ pstore-read pstore.db mykey bar $ pstore-read --revision=1 pstore.db mykey foo $ pstore-dump --log pstore.db ---  - file              :              path              :              pstore.db       size              :              488   log              :              - { number: ii, size: 56, time: 2020-xi-19T15:24:04Z }       - { number: 1, size: 56, time: 2020-11-19T15:23:52Z }       - { number: 0, size: 0, time: 2020-xi-19T15:23:52Z } ... $

Allow'southward pick this apart one step at a time…

$              repeat              foo              >              foo.txt $              echo              bar              >              bar.txt

Create two files which comprise curt text strings that nosotros'll presently record in a pstore file:

$ pstore-write --add-file mykey,foo.txt pstore.db

This control creates a new pstore file named pstore.db or appends to that file if it already exists. The choice of file name is arbitrary. The tool creates an entry in one of the pstore indexes with the key "mykey" which has a corresponding value string "foo\north" as read from the foo.txt file we created earlier.

$ pstore-read pstore.db mykey foo

Next we use the pstore-read utility to search the pstore.db file for key named "mykey" and impress its value. Happily it prints "foo\n": the same string that we passed to pstore-write above.

$ pstore-write --add-file mykey,bar.txt pstore.db

Now we run pstore-write once more but this fourth dimension associating the value "bar" (plus the inevitable newline) with the primal "mykey".

$ pstore-read pstore.db mykey bar

Running pstore-read a second time prints "bar" showing that the key "mykey" has been updated.

$ pstore-read --revision=ane pstore.db mykey foo

This control is a petty more than interesting. Here we've retrieved the original value that was linked to "mykey". Each fourth dimension that pstore-write stores information in a pstore file, information technology does so in a self-independent transaction. Each transaction is appended to the file, preserving the previous contents. The first transaction in a pstore file is number 0 (which is e'er empty). The first fourth dimension information is added, transaction 1 is created; the second time, we build transaction ii, and then on. Whatever redundant information stays in the file — and is immutable — until the garbage collector (pstore-vacuumd) runs. This property enables a store to be read without any need for locks.

$ pstore-dump --log pstore.db

The pstore-dump control allows us to inspect the innards of a pstore file. Information technology produces a YAML dump of the requested structures: the transaction log in this example showing a list of all of the transactions in the file (newest kickoff), how much information each of them is conveying, and when that data was committed. At that place is a small number of other utilities in the tools/ directory which allow various aspects of a pstore file to be explored.

millerthister.blogspot.com

Source: https://github.com/SNSystems/pstore

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