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Leonard Chan 9cbbc6a096 [NewPM] Second attempt at porting ASan This is the second attempt to port ASan to new PM after D52739. This takes the initialization requried by ASan from the Module by moving it into a separate class with it's own analysis that the new PM ASan can use. Changes: - Split AddressSanitizer into 2 passes: 1 for the instrumentation on the function, and 1 for the pass itself which creates an instance of the first during it's run. The same is done for AddressSanitizerModule. - Add new PM AddressSanitizer and AddressSanitizerModule. - Add legacy and new PM analyses for reading data needed to initialize ASan with. - Removed DominatorTree dependency from ASan since it was unused. - Move GlobalsMetadata and ShadowMapping out of anonymous namespace since the new PM analysis holds these 2 classes and will need to expose them. Differential Revision: https://reviews.llvm.org/D56470 llvm-svn: 353985		2019-02-13 22:22:48 +00:00
..
llvm	[NewPM] Second attempt at porting ASan	2019-02-13 22:22:48 +00:00
build.sh	Expose LLVM version string via macro in llvm-config.h, and modify Go bindings	2014-11-19 03:34:17 +00:00
conftest.go	Initial version of Go bindings.	2014-10-16 22:48:02 +00:00
README.txt	Because of CVE-2018-6574, some compiler options and linker options are restricted to prevent arbitrary code execution.	2018-02-23 20:12:24 +00:00

README.txt

This directory contains LLVM bindings for the Go programming language
(http://golang.org).

Prerequisites
-------------

* Go 1.2+.
* CMake (to build LLVM).

Using the bindings
------------------

The package path "llvm.org/llvm/bindings/go/llvm" can be used to
import the latest development version of LLVM from SVN. Paths such as
"llvm.org/llvm.v36/bindings/go/llvm" refer to released versions of LLVM.

It is recommended to use the "-d" flag with "go get" to download the
package or a dependency, as an additional step is required to build LLVM
(see "Building LLVM" below).

Building LLVM
-------------

The script "build.sh" in this directory can be used to build LLVM and prepare
it to be used by the bindings. If you receive an error message from "go build"
like this:

    ./analysis.go:4:84: fatal error: llvm-c/Analysis.h: No such file or directory
     #include <llvm-c/Analysis.h> // If you are getting an error here read bindings/go/README.txt

or like this:

    ./llvm_dep.go:5: undefined: run_build_sh

it means that LLVM needs to be built or updated by running the script.

    $ $GOPATH/src/llvm.org/llvm/bindings/go/build.sh

Any command line arguments supplied to the script are passed to LLVM's CMake
build system. A good set of arguments to use during development are:

    $ $GOPATH/src/llvm.org/llvm/bindings/go/build.sh -DCMAKE_BUILD_TYPE=Debug -DLLVM_TARGETS_TO_BUILD=host -DBUILD_SHARED_LIBS=ON

Note that CMake keeps a cache of build settings so once you have built
LLVM there is no need to pass these arguments again after updating.

Alternatively, you can build LLVM yourself, but you must then set the
CGO_CPPFLAGS, CGO_CXXFLAGS and CGO_LDFLAGS environment variables:

    $ export CGO_CPPFLAGS="`/path/to/llvm-build/bin/llvm-config --cppflags`"
    $ export CGO_CXXFLAGS=-std=c++11
    $ export CGO_LDFLAGS="`/path/to/llvm-build/bin/llvm-config --ldflags --libs --system-libs all`"
    $ go build -tags byollvm

If you see a compilation error while compiling your code with Go 1.9.4 or later as follows,

    go build llvm.org/llvm/bindings/go/llvm: invalid flag in #cgo LDFLAGS: -Wl,-headerpad_max_install_names

you need to setup $CGO_LDFLAGS_ALLOW to allow a compiler to specify some linker options:

    $ export CGO_LDFLAGS_ALLOW='-Wl,(-search_paths_first|-headerpad_max_install_names)'