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218 lines
8.1 KiB
Plaintext
218 lines
8.1 KiB
Plaintext
=pod
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=head1 NAME
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llvm2xpp - LLVM bitcode to LLVM C++ IR translator
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=head1 SYNOPSIS
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B<llvm2cpp> [I<options>] [I<filename>]
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=head1 DESCRIPTION
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B<llvm2cpp> translates from LLVM bitcode (.bc files) to a
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corresponding C++ source file that will make calls against the LLVM C++ API to
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build the same module as the input. By default, the C++ output is a complete
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program that builds the module, verifies it and then emits the module as
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LLVM assembly. This technique assists with testing because the input to
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B<llvm2cpp> and the output of the generated C++ program should be identical.
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If F<filename> is omitted or is C<->, then B<llvm2cpp> reads its input from
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standard input.
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If an output file is not specified with the B<-o> option, then
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B<llvm2cpp> sends its output to a file or standard output by following
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these rules:
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=over
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=item *
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If the input is standard input, then the output is standard output.
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=item *
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If the input is a file that ends with C<.bc>, then the output file is of
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the same name, except that the suffix is changed to C<.cpp>.
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=item *
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If the input is a file that does not end with the C<.bc> suffix, then the
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output file has the same name as the input file, except that the C<.cpp>
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suffix is appended.
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=back
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=head1 OPTIONS
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=over
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=item B<-f>
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Force overwrite. Normally, B<llvm2cpp> will refuse to overwrite an
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output file that already exists. With this option, B<llvm2cpp>
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will overwrite the output file and replace it with new C++ source code.
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=item B<--help>
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Print a summary of command line options.
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=item B<-f>
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Normally, B<llvm2cpp> will not overwrite an existing output file. With this
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option, that default behavior is changed and the program will overwrite existing
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output files.
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=item B<-o> F<filename>
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Specify the output file name. If F<filename> is C<->, then B<llvm2cpp>
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sends its output to standard output.
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=item B<-funcname> F<functionName>
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Specify the name of the function to be generated. The generated code contains a
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single function that produces the input module. By default its name is
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I<makeLLVMModule>. The B<-funcname> option overrides this default and allows
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you to control the name of the generated function. This is handy in conjunction
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with the B<-fragment> option when you only want B<llvm2cpp> to generate a
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single function that produces the module. With both options, such generated code
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could be I<#included> into another program.
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=item B<-for>
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Specify the name of the thing for which C++ code should be generated. By default
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the entire input module is re-generated. However, use of the various B<-gen-*>
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options can restrict what is produced. This option indicates what that
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restriction is.
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=item B<-gen-program>
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Specify that the output should be a complete program. Such program will recreate
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B<llvm2cpp>'s input as an LLVM module, verify that module, and then write out
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the module in LLVM assembly format. This is useful for doing identity tests
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where the output of the generated program is identical to the input to
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B<llvm2cpp>. The LLVM DejaGnu test suite can make use of this fact. This is the
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default form of generated output.
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If the B<-for> option is given with this option, it specifies the module
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identifier to use for the module created.
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=item B<-gen-module>
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Specify that the output should be a function that regenerates the module. It is
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assumed that this output will be #included into another program that has already
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arranged for the correct header files to be #included. The function generated
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takes no arguments and returns a I<Module*>.
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If the B<-for> option is given with this option, it specifies the module
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identifier to use in creating the module returned by the generated function.
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=item B<-gen-contents>
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Specify that the output should be a function that adds the contents of the input
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module to another module. It is assumed that the output will be #included into
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another program that has already arranged for the correct header files to be
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#included. The function generated takes a single argument of type I<Module*> and
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returns that argument. Note that Module level attributes such as endianess,
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pointer size, target triple and inline asm are not passed on from the input
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module to the destination module. Only the sub-elements of the module (types,
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constants, functions, global variables) will be added to the input module.
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If the B<-for> option is given with this option, it specifies the module
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identifier to set in the input module by the generated function.
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=item B<-gen-function>
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Specify that the output should be a function that produces the definitions
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necessary for a specific function to be added to a module. It is assumed that
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the output will be #included into another program that has already arranged
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for the correct header files to be #included. The function generated takes a
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single argument of type I<Module*> and returns the I<Function*> that it added to
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the module. Note that only those things (types, constants, etc.) directly
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needed in the definition of the function will be placed in the generated
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function.
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The B<-for> option must be given with this option or an error will be produced.
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The value of the option must be the name of a function in the input module for
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which code should be generated. If the named function does not exist an error
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will be produced.
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=item B<-gen-inline>
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This option is very analagous to B<-gen-function> except that the generated
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function will not re-produce the target function's definition. Instead, the body
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of the target function is inserted into some other function passed as an
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argument to the generated function. Similarly any arguments to the function must
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be passed to the generated function. The result of the generated function is the
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first basic block of the target function.
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The B<-for> option works the same way as it does for B<-gen-function>.
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=item B<-gen-variable>
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Specify that the output should be a function that produces the definitions
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necessary for a specific global variable to be added to a module. It is assumed
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that the output will be #included into another program that has already arranged
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for the correct header files to be #included. The function generated takes a
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single argument of type I<Module*> and returns the I<GlobalVariable*> that it
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added to the module. Note that only those things (types, constants, etc.)
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directly needed in the definition of the global variable will be placed in the
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generated function.
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The B<-for> option must be given with this option or an error will be produced.
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THe value of the option must be the name of a global variable in the input
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module for which code should be generated. If the named global variable does not
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exist an error will be produced.
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=item B<-gen-type>
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Specify that the output should be a function that produces the definitions
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necessary for specific type to be added to a module. It is assumed that the
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otuput will be #included into another program that has already arranged for the
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correct header files to be #included. The function generated take a single
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argument of type I<Module*> and returns the I<Type*> that it added to the
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module. Note that the generated function will only add the necessary type
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definitions to (possibly recursively) define the requested type.
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The B<-for> option must be given with this option or an error will be produced.
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The value of the option must be the name of a global type in the input module
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for which code should be generated. If the named type does not exist an error
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will be produced.
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=item B<-stats>
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Show pass statistics (not interesting in this program).
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=item B<-time-passes>
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Show pass timing statistics (not interesting in this program).
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=item B<-version>
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Show the version number of this program.
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=back
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=head1 EXIT STATUS
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If B<llvm2cpp> succeeds, it will exit with 0. Otherwise, if an error
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occurs, it will exit with a non-zero value.
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=head1 SEE ALSO
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L<llvm-as|llvm-as> L<tblgen|tblgen>
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=head1 NOTES
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This tool may be removed from a future version of LLVM. Instead, its
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functionality may be incorporated into the llc tool. It would then act similarly
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to other targets except its output would be C++ source that could be compiled to
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construct the input program.
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=head1 AUTHORS
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Written by Reid Spencer (L<http://hlvm.org>).
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=cut
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