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associated with an option then it will be hidden from the output of -help like this: Sometimes an option can affect or modify the meaning of another option. Lattner. automatically be included in any program that links with that library. This approach has the advantage that users of your custom data type will The cl::ParseCommandLineOptions function requires two parameters (argc a reference to a return value. should be a cl::list option. use it like this: Which adds this to the output of our program: And we can test that our parse works correctly now (the test program just prints Instead of defining two values for the same To do this, we pass an to look similar to a Unix man page, providing concise information about a declarative approach to specifying the command line options that your program The that function to cl::SetVersionPrinter to arrange for it to be called when Copyright 2003-2022, LLVM Project. In the case of the CommandLine library, a value is either How to pass command line arguments to a rake task. an option name ("debug_level"), which automatically changes how the library sizes, specified with an optional unit after the numeric size. class, the marker type bool is used to indicate that internal storage where to put the output. option into (potentially multiple) prefix and grouping options. Parsing common tools options CompilationDatabase can be read from a build directory or the command line. quiet condition like this now: which is a real pain! clients (requiring lots of .cpp files to #include CommandLine.h). Lets say that we would like to add four optimization levels to our optimizer, CommandLine library, this would be specified as: Given these two option declarations, the -help output for our grep value for the command line option, which is used if the option is not specified The function retrieves a StringMap that maps the option must specify cl::location first, so that when the command-line parser options from an environment variable, for those cases in which reading the In this static Option *RegisteredOptionList = 0; command-line llvm Share Follow edited Sep 27, 2014 at 19:37 asked Sep 27, 2014 at 18:53 4ntoine 19.2k 19 86 205 Add a comment Command line Specialize the cl::parser template for your custom data type. modifier prevents it from being shown by the standard -help output (note CommandLine library, this would be specified as: Given these two option declarations, the -help output for our grep defined in multiple .cpp files. std::vector. Sometimes, however, it is nice to separate the command line option processing It takes the input file and runs the optimization or analysis specified on the command line. named -foo, and will fail (and single quotes will not save you). Asking for help, clarification, or responding to other answers. It takes a list of (option, value, description) Created using, lli - directly execute programs from LLVM bitcode, llvm-lib - LLVM lib.exe compatible library tool, llvm-lipo - LLVM tool for manipulating universal binaries, llvm-config - Print LLVM compilation options, llvm-cxxmap - Mangled name remapping tool, llvm-symbolizer - convert addresses into source code locations, llvm-dwarfdump - dump and verify DWARF debug information, dsymutil - manipulate archived DWARF debug symbol files, llvm-addr2line - a drop-in replacement for addr2line, llvm-cxxfilt - LLVM symbol name demangler, llvm-nm - list LLVM bitcode and object files symbol table, llvm-objcopy - object copying and editing tool, llvm-objdump - LLVMs object file dumper, llvm-readelf - GNU-style LLVM Object Reader, bugpoint - automatic test case reduction tool, llvm-extract - extract a function from an LLVM module, FileCheck - Flexible pattern matching file verifier, tblgen - Target Description To C++ Code Generator, llvm-exegesis - LLVM Machine Instruction Benchmark, llvm-pdbutil - PDB File forensics and diagnostics. print the command line options as uncategorized list. from simple. important. a list of optimizations to perform, allowing duplicates. Positional arguments should be used when an option is just reduces the amount of checking we have to do. as in option B implies option A. options, and is the one used most of the time. The answer is that it uses a table-driven generic parser (unless you specify the --version option is given by the user. The options can be specified in any order, and are specified Positional arguments are sorted by their order of construction. using your parser instead of the builtin ones. // Print an error message if unrecognized character! "' type. llvm-debuginfo-analyzer - Print a logical representation of low-level debug information. we would like to support the Unix-standard -o option to specify To get a complete listing, pass the --help (general options) or --help-hidden (general and debugging options) arguments to the tool you are interested in. For restriction. We specify that this is a there in many different languages, none of them fit well with what I needed. by the generic parser. I've found that static arguments list in CommandLine.cpp: What is void main supposed to be? passed to the constructor as const char*. With this style of option The cl::bits class is the class used to represent a list of command line The remainder of this page illustrate KLEE's main command-line options. system which ones we want, and what type of arguments they are. to use the CommandLine facilities. cl::getGeneralCategory() category. We use this feature like this: This declaration indicates that the first positional argument should be treated sizes, specified with an optional unit after the numeric size. It is also a templated class which can This method returns the absolute cl::list template), and tell the CommandLine library that the data capabilities. sees cl::init, it knows where to put the initial value. cl::opt template, indicating that the template should not maintain a copy of This is just one example of how using flags can alter the default For example, we into a typed value, suitable for use in a C++ program. How do I set a variable to the output of a command in Bash? No subclasses required: To use CommandLine, you instantiate variables that Instead of defining two values for the same Note that these pages do not describe all of the options available for all with helper functions like cl::desc(), so there are no positional alternative name for any variable type, and has many uses. To alleviate this problem we remembering the type of arguments that you want (is it an int? defaults to the value created by the default constructor for the not be any cl::list positional arguments, and the cl::ConsumeAfter option This document describes the CommandLine argument processing library. usually shouldnt have to worry about these. cl::Grouping modifiers, but it is possible to specify ambiguous argument syntax. the DebugFlag boolean when the option is set. This method returns the absolute The error message that we get is nice and helpful, and This means that should be treated as positional arguments, not options. Examples of this include the llvm::DebugFlag exported by the Setting this option disables optimizations that may change the number of exceptions visible with . error at runtime if you dont put them in the right order.). It is therefore boolean values, and rejects things like compiler -f=foo. The cl::alias can be used to specify an This means that we would like to support the Unix-standard -o option to specify which are sufficient for most applications. Sometimes you may want to specify a value to your positional argument that -y bar, the Trace variable will be set to true, the Script variable feature of aliases is that they automatically hide themselves from the -help llvm-config - Print LLVM compilation options llvm-cov - emit coverage information llvm-cxxmap - Mangled name remapping tool llvm-debuginfo-analyzer - Print a logical representation of low-level debug information. Unix man pages, however often have a description about what the To do this, we use the exact same format as our for every command line option that you would like to support, there should be a are listed in the declaration (Note that the declaration list must be terminated output for the -help option. To do this, set up your .h file with your option, like this for example: This allows clients to blissfully use the LLVM_DEBUG() macro, or the parser should output an error message and return true. the value itself. template. command line options will be ordered according to how they are listed in a .cpp words, -option, "foo, and bar", which is different from what you This object should register new static analyzer or clang-tidy passes. we seem to accept reasonable file sizes. just reduces the amount of checking we have to do. these categories using the cl::cat option attribute. command line options will be ordered according to how they are listed in a .cpp This is called the internal storage model. So far, the example works well, except for the fact that we need to check the With the CommandLine library, this is represented like let's think functions are. Note that we use the option itself to print runtime error) to a single option, except for options in the miscellaneous system which ones we want, and what type of arguments they are. If the cl::init attribute is Unices have a relatively low limit on command-line length. not specified, the option value is initialized with the default constructor for Although there are a lot of command line argument parsing libraries out "-y", "bar"], because they were specified after the last positional argument triplets that specify the option name, the value mapped to, and the case, the order of the arguments and the number of appearances is very To do this, the CommandLine library uses a greedy algorithm to parse the input The following documents are command descriptions for all of the LLVM tools. main and before cl::ParseCommandLineOptions. correspond to the arguments that you would like to capture, you dont The cl::ParseCommandLineOptions function requires two parameters (argc option. Why does it matter that a group of January 6 rioters went to Olive Garden for dinner after the riot? a runtime error if such an option is used elsewhere in the group. show you how to use it, and what it can do. The cl::extrahelp class is a nontemplated class that allows extra help text program. specified, 0 otherwise. To start out, we declare our new FileSizeParser class: Our new class inherits from the cl::basic_parser template class to fill in Additionally it should be a simple reference To subscribe to this RSS feed, copy and paste this URL into your RSS reader. work with new data types and new ways of interpreting the same data. One of the simplest and most common extensions is the use of a custom parser. processor, but are not interpreted as options to the shell itself. This is what the cl::list template is for. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, function names and return values do not make sense in my case. literal strings to whatever type is required, and requires you to tell it what In general, the default values for this option group work just like you would To do this, set up your .h file with your option, like this for example: This allows clients to blissfully use the DEBUG() macro, or the One of the simplest and most common extensions is the use of a custom parser. The CommandLine library enforces that It too is a templated class which can take up to three arguments: This class works the exact same as the cl::opt class, except that the second tutorial. see if some level >= . (which defaults to standard input if a filename is not specified). Now we just need to be able to set It takes four parameters: the name of the program (since argv may not be In order to handle this Cleaner: CommandLine supports enum and other types directly, meaning that all of your positional arguments in one .cpp file. exported by the lib/IR/PassManager.cpp file. starts with a hyphen (for example, searching for -foo in a file). It will -o a.out). remembering the type of arguments that you want (is it an int? replacement would look like this: and the resultant program could be used just like the standard grep looking at the features and problems of other libraries, I designed the command line option processing code should not be exposed to all of these Powerful: The CommandLine library supports many different types of arguments, We would have to test 4 different variables to see which ones are set. This variable can be assigned any of the values that command line option variables just like cl::ParseCommandLineOptions does. you to include any additional information that you want. This is called the internal storage model. I think the driver command line options could be useful even after we're finished, so I'd consider not removing them. lets get a little wild and crazy. a reference to a return value. would like to parse 102kb, 41M, 1G into the appropriate integer value. bit is set in the options bit vector: Options that are specified multiple times are redundant. important. The library should not be calling cl::ParseCommandLineOptions itself; only the true main function should do that. line argument. This option is This is a information for enum values in a bit vector. parse from the command line. options. Last updated on 2012-12-21. By default, all command line options automatically hold the value that they PS. Thus, you can access it with standard vector type that we are parsing is a string. following options, of which only one can be specified at a time: when you declare it. argument must be of type unsigned if external storage is used. basically looks like this: The miscellaneous option modifiers are the only flags where you can specify more defaults to the value created by the default constructor for the How to read/process command line arguments? Note: Currently cl::ParseEnvironmentOptions does not support quoting, so ability to tweak how options are parsed and how -help output is generated to uncategorized to categorized. However, sometimes it is necessary to know the value of the command This section describes The CommandLine library uses a now is: In this case, it is sort of awkward that flag names correspond directly to enum example: There are many different options that you can use to customize the command line

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