1 //===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Optimizations may be specified an arbitrary number of times on the command
11 // line, they are run in the order specified.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Module.h"
16 #include "llvm/PassManager.h"
17 #include "llvm/Bytecode/Reader.h"
18 #include "llvm/Bytecode/WriteBytecodePass.h"
19 #include "llvm/Assembly/PrintModulePass.h"
20 #include "llvm/Analysis/Verifier.h"
21 #include "llvm/Target/TargetMachine.h"
22 #include "llvm/Target/TargetMachineImpls.h"
23 #include "llvm/Support/PassNameParser.h"
24 #include "llvm/System/Signals.h"
25 #include "Support/SystemUtils.h"
32 // The OptimizationList is automatically populated with registered Passes by the
35 static cl::list<const PassInfo*, bool,
36 FilteredPassNameParser<PassInfo::Optimization> >
37 OptimizationList(cl::desc("Optimizations available:"));
40 // Other command line options...
42 static cl::opt<std::string>
43 InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
45 static cl::opt<std::string>
46 OutputFilename("o", cl::desc("Override output filename"),
47 cl::value_desc("filename"), cl::init("-"));
50 Force("f", cl::desc("Overwrite output files"));
53 PrintEachXForm("p", cl::desc("Print module after each transformation"));
56 NoOutput("disable-output",
57 cl::desc("Do not write result bytecode file"), cl::Hidden);
60 NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
63 Quiet("q", cl::desc("Don't print 'program modified' message"));
66 //===----------------------------------------------------------------------===//
69 int main(int argc, char **argv) {
70 cl::ParseCommandLineOptions(argc, argv,
71 " llvm .bc -> .bc modular optimizer\n");
72 PrintStackTraceOnErrorSignal();
74 // Allocate a full target machine description only if necessary...
75 // FIXME: The choice of target should be controllable on the command line.
76 std::auto_ptr<TargetMachine> target;
78 TargetMachine* TM = NULL;
79 std::string ErrorMessage;
81 // Load the input module...
82 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
84 std::cerr << argv[0] << ": ";
85 if (ErrorMessage.size())
86 std::cerr << ErrorMessage << "\n";
88 std::cerr << "bytecode didn't read correctly.\n";
92 // Figure out what stream we are supposed to write to...
93 std::ostream *Out = &std::cout; // Default to printing to stdout...
94 if (OutputFilename != "-") {
95 if (!Force && std::ifstream(OutputFilename.c_str())) {
96 // If force is not specified, make sure not to overwrite a file!
97 std::cerr << argv[0] << ": error opening '" << OutputFilename
98 << "': file exists!\n"
99 << "Use -f command line argument to force output\n";
102 Out = new std::ofstream(OutputFilename.c_str());
105 std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
109 // Make sure that the Output file gets unlinked from the disk if we get a
111 RemoveFileOnSignal(OutputFilename);
114 // If the output is set to be emitted to standard out, and standard out is a
115 // console, print out a warning message and refuse to do it. We don't impress
116 // anyone by spewing tons of binary goo to a terminal.
117 if (Out == &std::cout && isStandardOutAConsole() && !Force && !NoOutput) {
118 std::cerr << "WARNING: It looks like you're attempting to print out a "
119 << "bytecode file. I'm\ngoing to pretend you didn't ask me to do"
120 << " this (for your own good). If you\nREALLY want to taste LLVM"
121 << " bytecode first hand, you can force output with the\n'-f'"
126 // Create a PassManager to hold and optimize the collection of passes we are
131 // Add an appropriate TargetData instance for this module...
132 Passes.add(new TargetData("opt", M.get()));
134 // Create a new optimization pass for each one specified on the command line
135 for (unsigned i = 0; i < OptimizationList.size(); ++i) {
136 const PassInfo *Opt = OptimizationList[i];
138 if (Opt->getNormalCtor())
139 Passes.add(Opt->getNormalCtor()());
140 else if (Opt->getTargetCtor()) {
142 if (target.get() == NULL)
143 target.reset(allocateSparcTargetMachine()); // FIXME: target option
145 assert(target.get() && "Could not allocate target machine!");
146 Passes.add(Opt->getTargetCtor()(*target.get()));
148 std::cerr << argv[0] << ": cannot create pass: " << Opt->getPassName()
152 Passes.add(new PrintModulePass(&std::cerr));
155 // Check that the module is well formed on completion of optimization
157 Passes.add(createVerifierPass());
159 // Write bytecode out to disk or cout as the last step...
161 Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
163 // Now that we have all of the passes ready, run them.
164 if (Passes.run(*M.get()))