llvm-extract-2.71
Extract a function from an llvm module
Usage
llvm-extract [options]
--func
function-name
[filename]
Overview
The llvm-extract command takes the name of a function and extracts it from the specified LLVM bitcode file. It is primarily used as a debugging tool to reduce test cases from larger programs that are triggering a bug.
In addition to extracting the bitcode of the specified function, llvm-extract will also remove unreachable global variables, prototypes, and unused types.
The llvm-extract command reads its input from standard input if filename is omitted or if filename is -. The output is always written to standard output, unless the -o option is specified (see below).
Options
-
-f -
Enable binary output on terminals. Normally,
llvm-extractwill refuse to write raw bitcode output if the output stream is a terminal. With this option,llvm-extractwill write raw bitcode regardless of the output device.
-
--func function-name -
Extract the function named function-name from the LLVM bitcode. May be specified multiple times to extract multiple functions at once.
-
--glob global-name -
Extract the global variable named global-name from the LLVM bitcode. May be specified multiple times to extract multiple global variables at once.
-
-help -
Print a summary of command line options.
-
-o filename -
Specify the output filename. If filename is "-" (the default), then
llvm-extractsends its output to standard output.
-
-S -
Write output in LLVM intermediate language (instead of bitcode).
Exit status
If llvm-extract succeeds, it will exit with 0. Otherwise, if an error occurs, it will exit with a non-zero value.