Home | History | Annotate | Download | only in slang 
      1 //===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 //  This utility may be invoked in the following manner:
     11 //   llvm-as --help         - Output information about command line switches
     12 //   llvm-as [options]      - Read LLVM asm from stdin, write bitcode to stdout
     13 //   llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode
     14 //                            to the x.bc file.
     15 //
     16 //===----------------------------------------------------------------------===//
     17 
     18 #include "llvm/IR/LLVMContext.h"
     19 #include "llvm/IR/Verifier.h"
     20 #include "llvm/AsmParser/Parser.h"
     21 #include "llvm/Bitcode/ReaderWriter.h"
     22 #include "llvm/IR/Module.h"
     23 #include "llvm/Support/CommandLine.h"
     24 #include "llvm/Support/FileSystem.h"
     25 #include "llvm/Support/ManagedStatic.h"
     26 #include "llvm/Support/PrettyStackTrace.h"
     27 #include "llvm/Support/Signals.h"
     28 #include "llvm/Support/SourceMgr.h"
     29 #include "llvm/Support/SystemUtils.h"
     30 #include "llvm/Support/ToolOutputFile.h"
     31 
     32 #include "slang_bitcode_gen.h"
     33 #include "slang_version.h"
     34 
     35 #include <memory>
     36 using namespace llvm;
     37 
     38 static cl::opt<std::string>
     39 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
     40 
     41 static cl::opt<std::string>
     42 OutputFilename("o", cl::desc("Override output filename"),
     43                cl::value_desc("filename"));
     44 
     45 static cl::opt<bool>
     46 Force("f", cl::desc("Enable binary output on terminals"));
     47 
     48 static cl::opt<bool>
     49 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
     50 
     51 static cl::opt<uint32_t>
     52 TargetAPI("target-api", cl::desc("Specify RenderScript target API version "
     53                                  "(0 = development API) (default is 0)"),
     54           cl::init(0));
     55 
     56 static cl::opt<bool>
     57 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
     58 
     59 static cl::opt<bool>
     60 DisableVerify("disable-verify", cl::Hidden,
     61               cl::desc("Do not run verifier on input LLVM (dangerous!)"));
     62 
     63 
     64 static void WriteOutputFile(const Module *M, uint32_t ModuleTargetAPI) {
     65   // Infer the output filename if needed.
     66   if (OutputFilename.empty()) {
     67     if (InputFilename == "-") {
     68       OutputFilename = "-";
     69     } else {
     70       std::string IFN = InputFilename;
     71       int Len = IFN.length();
     72       if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
     73         // Source ends in .ll
     74         OutputFilename = std::string(IFN.begin(), IFN.end()-3);
     75       } else {
     76         OutputFilename = IFN;   // Append a .bc to it
     77       }
     78       OutputFilename += ".bc";
     79     }
     80   }
     81 
     82   std::error_code EC;
     83   std::unique_ptr<tool_output_file> Out
     84   (new tool_output_file(OutputFilename.c_str(), EC, llvm::sys::fs::F_None));
     85   if (EC) {
     86     // TODO(srhines): This isn't actually very specific and needs cleanup.
     87     errs() << EC.message() << '\n';
     88     exit(1);
     89   }
     90 
     91   if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) {
     92     slang::writeBitcode(Out->os(), *M,
     93         /* TargetAPI = */ ModuleTargetAPI,
     94         /* OptimizationLevel = */ 3,
     95         /* GenerateDebugInfo = */ false);
     96 
     97     if (!Out->os().has_error()) {
     98       // Declare success.
     99       Out->keep();
    100     }
    101   }
    102 }
    103 
    104 int main(int argc, char **argv) {
    105   // Print a stack trace if we signal out.
    106   sys::PrintStackTraceOnErrorSignal();
    107   PrettyStackTraceProgram X(argc, argv);
    108   LLVMContext &Context = getGlobalContext();
    109   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
    110   cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
    111 
    112   // Check target API.
    113   uint32_t ActualTargetAPI = (TargetAPI == 0) ? RS_DEVELOPMENT_API : TargetAPI;
    114 
    115   if (ActualTargetAPI != RS_DEVELOPMENT_API &&
    116       (ActualTargetAPI < SLANG_MINIMUM_TARGET_API ||
    117        ActualTargetAPI > SLANG_MAXIMUM_TARGET_API)) {
    118     errs() << "target API level '" << ActualTargetAPI << "' is out of range "
    119            << "('" << SLANG_MINIMUM_TARGET_API << "' - '"
    120            << SLANG_MAXIMUM_TARGET_API << "')\n";
    121     return 1;
    122   }
    123 
    124   // Parse the file now...
    125   SMDiagnostic Err;
    126   std::unique_ptr<Module> M(parseAssemblyFile(InputFilename, Err, Context));
    127   if (M.get() == 0) {
    128     Err.print(argv[0], errs());
    129     return 1;
    130   }
    131 
    132   if (!DisableVerify) {
    133     std::string Err;
    134     raw_string_ostream stream(Err);
    135     if (verifyModule(*M.get(), &stream)) {
    136       errs() << argv[0]
    137              << ": assembly parsed, but does not verify as correct!\n";
    138       errs() << Err;
    139       return 1;
    140     }
    141   }
    142 
    143   if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
    144 
    145   if (!DisableOutput)
    146     WriteOutputFile(M.get(), ActualTargetAPI);
    147 
    148   return 0;
    149 }
    150