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 "StripUnkAttr/strip_unknown_attributes.h"
36
37#include <memory>
38using namespace llvm;
39
40static cl::opt<std::string>
41InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
42
43static cl::opt<std::string>
44OutputFilename("o", cl::desc("Override output filename"),
45               cl::value_desc("filename"));
46
47static cl::opt<bool>
48Force("f", cl::desc("Enable binary output on terminals"));
49
50static cl::opt<bool>
51DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
52
53static cl::opt<uint32_t>
54TargetAPI("target-api", cl::desc("Specify RenderScript target API version "
55                                 "(0 = development API) (default is 0)"),
56          cl::init(0));
57
58static cl::opt<bool>
59DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
60
61static cl::opt<bool>
62DisableVerify("disable-verify", cl::Hidden,
63              cl::desc("Do not run verifier on input LLVM (dangerous!)"));
64
65static void stripUnknownAttributes(llvm::Module *M) {
66  for (llvm::Function &F : *M)
67    slang::stripUnknownAttributes(F);
68}
69
70static void WriteOutputFile(const Module *M, uint32_t ModuleTargetAPI) {
71  // Infer the output filename if needed.
72  if (OutputFilename.empty()) {
73    if (InputFilename == "-") {
74      OutputFilename = "-";
75    } else {
76      std::string IFN = InputFilename;
77      int Len = IFN.length();
78      if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
79        // Source ends in .ll
80        OutputFilename = std::string(IFN.begin(), IFN.end()-3);
81      } else {
82        OutputFilename = IFN;   // Append a .bc to it
83      }
84      OutputFilename += ".bc";
85    }
86  }
87
88  std::error_code EC;
89  std::unique_ptr<tool_output_file> Out
90  (new tool_output_file(OutputFilename.c_str(), EC, llvm::sys::fs::F_None));
91  if (EC) {
92    // TODO(srhines): This isn't actually very specific and needs cleanup.
93    errs() << EC.message() << '\n';
94    exit(1);
95  }
96
97  if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) {
98    slang::writeBitcode(Out->os(), *M,
99        /* TargetAPI = */ ModuleTargetAPI,
100        /* OptimizationLevel = */ 3,
101        /* GenerateDebugInfo = */ false);
102
103    if (!Out->os().has_error()) {
104      // Declare success.
105      Out->keep();
106    }
107  }
108}
109
110int main(int argc, char **argv) {
111  // Print a stack trace if we signal out.
112  sys::PrintStackTraceOnErrorSignal(argv[0]);
113  PrettyStackTraceProgram X(argc, argv);
114  LLVMContext Context;
115  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
116  cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
117
118  // Check target API.
119  uint32_t ActualTargetAPI = (TargetAPI == 0) ? RS_DEVELOPMENT_API : TargetAPI;
120
121  if (ActualTargetAPI != RS_DEVELOPMENT_API &&
122      (ActualTargetAPI < SLANG_MINIMUM_TARGET_API ||
123       ActualTargetAPI > SLANG_MAXIMUM_TARGET_API)) {
124    errs() << "target API level '" << ActualTargetAPI << "' is out of range "
125           << "('" << SLANG_MINIMUM_TARGET_API << "' - '"
126           << SLANG_MAXIMUM_TARGET_API << "')\n";
127    return 1;
128  }
129
130  // Parse the file now...
131  SMDiagnostic Err;
132  std::unique_ptr<Module> M(parseAssemblyFile(InputFilename, Err, Context));
133  if (M.get() == 0) {
134    Err.print(argv[0], errs());
135    return 1;
136  }
137
138  if (!DisableVerify) {
139    std::string Err;
140    raw_string_ostream stream(Err);
141    if (verifyModule(*M.get(), &stream)) {
142      errs() << argv[0]
143             << ": assembly parsed, but does not verify as correct!\n";
144      errs() << Err;
145      return 1;
146    }
147  }
148
149  stripUnknownAttributes(M.get());
150
151  if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
152
153  if (!DisableOutput)
154    WriteOutputFile(M.get(), ActualTargetAPI);
155
156  return 0;
157}
158