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//===-- llvm-diff.cpp - Module comparator command-line driver ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the command-line driver for the difference engine.
//
//===----------------------------------------------------------------------===//
#include "DiffLog.h"
#include "DifferenceEngine.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Type.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
#include <utility>
using namespace llvm;
/// Reads a module from a file. On error, messages are written to stderr
/// and null is returned.
static Module *ReadModule(LLVMContext &Context, StringRef Name) {
SMDiagnostic Diag;
Module *M = ParseIRFile(Name, Diag, Context);
if (!M)
Diag.print("llvm-diff", errs());
return M;
}
static void diffGlobal(DifferenceEngine &Engine, Module *L, Module *R,
StringRef Name) {
// Drop leading sigils from the global name.
if (Name.startswith("@")) Name = Name.substr(1);
Function *LFn = L->getFunction(Name);
Function *RFn = R->getFunction(Name);
if (LFn && RFn)
Engine.diff(LFn, RFn);
else if (!LFn && !RFn)
errs() << "No function named @" << Name << " in either module\n";
else if (!LFn)
errs() << "No function named @" << Name << " in left module\n";
else
errs() << "No function named @" << Name << " in right module\n";
}
static cl::opt<std::string> LeftFilename(cl::Positional,
cl::desc("<first file>"),
cl::Required);
static cl::opt<std::string> RightFilename(cl::Positional,
cl::desc("<second file>"),
cl::Required);
static cl::list<std::string> GlobalsToCompare(cl::Positional,
cl::desc("<globals to compare>"));
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv);
LLVMContext Context;
// Load both modules. Die if that fails.
Module *LModule = ReadModule(Context, LeftFilename);
Module *RModule = ReadModule(Context, RightFilename);
if (!LModule || !RModule) return 1;
DiffConsumer Consumer;
DifferenceEngine Engine(Consumer);
// If any global names were given, just diff those.
if (!GlobalsToCompare.empty()) {
for (unsigned I = 0, E = GlobalsToCompare.size(); I != E; ++I)
diffGlobal(Engine, LModule, RModule, GlobalsToCompare[I]);
// Otherwise, diff everything in the module.
} else {
Engine.diff(LModule, RModule);
}
delete LModule;
delete RModule;
return Consumer.hadDifferences();
}
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