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gow ==> g
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README.md
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README.md
@ -4,20 +4,19 @@ Go Whole Program LLVM
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Introduction
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------------
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This project, gowllvm, provides tools for building whole-program (or
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This project, gllvm, provides tools for building whole-program (or
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whole-library) LLVM bitcode files from an unmodified C or C++
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source package. It currently runs on `*nix` platforms such as Linux,
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FreeBSD, and Mac OS X. It is a Go port of the WLLVM project, available
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at https://github.com/SRI-CSL/whole-program-llvm.
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FreeBSD, and Mac OS X. It is a Go port of the [wllvm](https://github.com/SRI-CSL/whole-program-llvm).
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gowllvm provides compiler wrappers that work in two
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gllvm provides compiler wrappers that work in two
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steps. The wrappers first invoke the compiler as normal. Then, for
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each object file, they call a bitcode compiler to produce LLVM
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bitcode. The wrappers also store the location of the generated bitcode
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file in a dedicated section of the object file. When object files are
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linked together, the contents of the dedicated sections are
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concatenated (so we don't lose the locations of any of the constituent
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bitcode files). After the build completes, one can use a gowllvm
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bitcode files). After the build completes, one can use a gllvm
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utility to read the contents of the dedicated section and link all of
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the bitcode into a single whole-program bitcode file. This utility
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works for both executable and native libraries.
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@ -25,11 +24,11 @@ works for both executable and native libraries.
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This two-phase build process is necessary to be a drop-in replacement
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for gcc or g++ in any build system. Using the LTO framework in gcc
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and the gold linker plugin works in many cases, but fails in the
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presence of static libraries in builds. gowllvm's approach has the
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presence of static libraries in builds. gllvm's approach has the
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distinct advantage of generating working binaries, in case some part
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of a build process requires that.
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gowllvm currently works with clang.
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gllvm currently works with clang.
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Installation
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------------
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@ -37,8 +36,8 @@ Installation
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Requirements
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=======
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You need the Go compiler to compile gowllvm, and the clang/clang++ executables
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to use gowllvm. Follow the instructions here to get started:
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You need the Go compiler to compile gllvm, and the clang/clang++ executables
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to use gllvm. Follow the instructions here to get started:
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https://golang.org/doc/install.
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As for now, let us name `$GOROOT` your root Go path that you can obtain by
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@ -53,10 +52,10 @@ Build
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First, you must checkout the project under the directory `$GOROOT/src`:
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```
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cd $GOROOT/src
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git clone https://github.com/loicgelle/gowllvm
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git clone https://github.com/SRI-CSL/gllvm
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```
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To build and install gowllvm on your system, type:
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To build and install gllvm on your system, type:
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```
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make install
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```
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@ -64,7 +63,7 @@ make install
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Usage
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-----
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gowllvm includes three symlinks to the program's binary: `gclang` and
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gllvm includes three symlinks to the program's binary: `gclang` and
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`gclang++`to compile C and C++, and an auxiliary tool `get-bc` for
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extracting the bitcode from a build product (object file, executable, library
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or archive).
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@ -98,7 +97,7 @@ Preserving bitcode files in a store
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Sometimes it can be useful to preserve the bitcode files produced in a
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build, either to prevent deletion or to retrieve them later. If the
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environment variable `GLLVM_BC_STORE` is set to the absolute path of
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an existing directory, then gowllvm will copy the produced bitcode files
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an existing directory, then gllvm will copy the produced bitcode files
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into that directory. The name of a copied bitcode file is the hash of the path
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to the original bitcode file. For convenience, when using both the manifest
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feature of `get-bc` and the store, the manifest will contain both the
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