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72b0e155fd
Summary:
Currently llvm::SplitModule as the first step globalizes all local objects, which might not be desirable in some scenarios.
This change adds a new flag to llvm::SplitModule that uses SCC approach to search for a balanced partition without the need to externalize symbols.
Such partition might not be possible or fully balanced for a given number of partitions, and is a function of the module properties (global/local dependencies within the module).
Joint development Tobias Edler von Koch (tobias@codeaurora.org) and Sergei Larin (slarin@codeaurora.org)
Subscribers: llvm-commits, joker.eph
Differential Revision: http://reviews.llvm.org/D16124
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258083 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
//===-- llvm-split: command line tool for testing module splitter ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This program can be used to test the llvm::SplitModule function.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IRReader/IRReader.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Transforms/Utils/SplitModule.h"
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using namespace llvm;
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
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cl::init("-"), cl::value_desc("filename"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Override output filename"),
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cl::value_desc("filename"));
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static cl::opt<unsigned> NumOutputs("j", cl::Prefix, cl::init(2),
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cl::desc("Number of output files"));
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static cl::opt<bool>
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PreserveLocals("preserve-locals", cl::Prefix, cl::init(false),
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cl::desc("Split without externalizing locals"));
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int main(int argc, char **argv) {
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LLVMContext &Context = getGlobalContext();
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SMDiagnostic Err;
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cl::ParseCommandLineOptions(argc, argv, "LLVM module splitter\n");
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std::unique_ptr<Module> M = parseIRFile(InputFilename, Err, Context);
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if (!M) {
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Err.print(argv[0], errs());
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return 1;
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}
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unsigned I = 0;
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SplitModule(std::move(M), NumOutputs, [&](std::unique_ptr<Module> MPart) {
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std::error_code EC;
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std::unique_ptr<tool_output_file> Out(new tool_output_file(
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OutputFilename + utostr(I++), EC, sys::fs::F_None));
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if (EC) {
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errs() << EC.message() << '\n';
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exit(1);
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}
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WriteBitcodeToFile(MPart.get(), Out->os());
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// Declare success.
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Out->keep();
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}, PreserveLocals);
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return 0;
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}
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