92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
//===-- llvm-diff.cpp - Module comparator command-line driver ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the command-line driver for the difference engine.
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//
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//===----------------------------------------------------------------------===//
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#include "DiffLog.h"
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#include "DifferenceEngine.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.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/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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#include <string>
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#include <utility>
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using namespace llvm;
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/// Reads a module from a file. On error, messages are written to stderr
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/// and null is returned.
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static std::unique_ptr<Module> readModule(LLVMContext &Context,
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StringRef Name) {
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SMDiagnostic Diag;
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std::unique_ptr<Module> M = parseIRFile(Name, Diag, Context);
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if (!M)
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Diag.print("llvm-diff", errs());
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return M;
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}
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static void diffGlobal(DifferenceEngine &Engine, Module &L, Module &R,
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StringRef Name) {
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// Drop leading sigils from the global name.
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if (Name.startswith("@")) Name = Name.substr(1);
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Function *LFn = L.getFunction(Name);
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Function *RFn = R.getFunction(Name);
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if (LFn && RFn)
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Engine.diff(LFn, RFn);
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else if (!LFn && !RFn)
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errs() << "No function named @" << Name << " in either module\n";
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else if (!LFn)
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errs() << "No function named @" << Name << " in left module\n";
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else
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errs() << "No function named @" << Name << " in right module\n";
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}
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static cl::opt<std::string> LeftFilename(cl::Positional,
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cl::desc("<first file>"),
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cl::Required);
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static cl::opt<std::string> RightFilename(cl::Positional,
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cl::desc("<second file>"),
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cl::Required);
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static cl::list<std::string> GlobalsToCompare(cl::Positional,
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cl::desc("<globals to compare>"));
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv);
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LLVMContext Context;
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// Load both modules. Die if that fails.
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std::unique_ptr<Module> LModule = readModule(Context, LeftFilename);
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std::unique_ptr<Module> RModule = readModule(Context, RightFilename);
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if (!LModule || !RModule) return 1;
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DiffConsumer Consumer;
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DifferenceEngine Engine(Consumer);
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// If any global names were given, just diff those.
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if (!GlobalsToCompare.empty()) {
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for (unsigned I = 0, E = GlobalsToCompare.size(); I != E; ++I)
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diffGlobal(Engine, *LModule, *RModule, GlobalsToCompare[I]);
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// Otherwise, diff everything in the module.
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} else {
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Engine.diff(LModule.get(), RModule.get());
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}
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return Consumer.hadDifferences();
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}
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