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>
36using namespace llvm;
37
38static cl::opt<std::string>
39InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
40
41static cl::opt<std::string>
42OutputFilename("o", cl::desc("Override output filename"),
43               cl::value_desc("filename"));
44
45static cl::opt<bool>
46Force("f", cl::desc("Enable binary output on terminals"));
47
48static cl::opt<bool>
49DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
50
51static cl::opt<uint32_t>
52TargetAPI("target-api", cl::desc("Specify RenderScript target API version "
53                                 "(0 = development API) (default is 0)"),
54          cl::init(0));
55
56static cl::opt<bool>
57DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
58
59static cl::opt<bool>
60DisableVerify("disable-verify", cl::Hidden,
61              cl::desc("Do not run verifier on input LLVM (dangerous!)"));
62
63
64static 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
104int 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