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/AsmParser/Parser.h"
19 #include "llvm/Bitcode/ReaderWriter.h"
20 #include "llvm/IR/LLVMContext.h"
21 #include "llvm/IR/Module.h"
22 #include "llvm/IR/Verifier.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 #include <memory>
32 using namespace llvm;
33
34 static cl::opt<std::string> InputFilename(cl::Positional,
35 cl::desc("<input .llvm file>"),
36 cl::init("-"));
37
38 static cl::opt<std::string> OutputFilename("o",
39 cl::desc("Override output filename"),
40 cl::value_desc("filename"));
41
42 static cl::opt<bool> Force("f", cl::desc("Enable binary output on terminals"));
43
44 static cl::opt<bool> DisableOutput("disable-output", cl::desc("Disable output"),
45 cl::init(false));
46
47 static cl::opt<bool> EmitModuleHash("module-hash", cl::desc("Emit module hash"),
48 cl::init(false));
49
50 static cl::opt<bool> DumpAsm("d", cl::desc("Print assembly as parsed"),
51 cl::Hidden);
52
53 static cl::opt<bool>
54 DisableVerify("disable-verify", cl::Hidden,
55 cl::desc("Do not run verifier on input LLVM (dangerous!)"));
56
57 static cl::opt<bool> PreserveBitcodeUseListOrder(
58 "preserve-bc-uselistorder",
59 cl::desc("Preserve use-list order when writing LLVM bitcode."),
60 cl::init(true), cl::Hidden);
61
WriteOutputFile(const Module * M)62 static void WriteOutputFile(const Module *M) {
63 // Infer the output filename if needed.
64 if (OutputFilename.empty()) {
65 if (InputFilename == "-") {
66 OutputFilename = "-";
67 } else {
68 StringRef IFN = InputFilename;
69 OutputFilename = (IFN.endswith(".ll") ? IFN.drop_back(3) : IFN).str();
70 OutputFilename += ".bc";
71 }
72 }
73
74 std::error_code EC;
75 std::unique_ptr<tool_output_file> Out(
76 new tool_output_file(OutputFilename, EC, sys::fs::F_None));
77 if (EC) {
78 errs() << EC.message() << '\n';
79 exit(1);
80 }
81
82 if (Force || !CheckBitcodeOutputToConsole(Out->os(), true))
83 WriteBitcodeToFile(M, Out->os(), PreserveBitcodeUseListOrder, nullptr,
84 EmitModuleHash);
85
86 // Declare success.
87 Out->keep();
88 }
89
main(int argc,char ** argv)90 int main(int argc, char **argv) {
91 // Print a stack trace if we signal out.
92 sys::PrintStackTraceOnErrorSignal(argv[0]);
93 PrettyStackTraceProgram X(argc, argv);
94 LLVMContext Context;
95 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
96 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
97
98 // Parse the file now...
99 SMDiagnostic Err;
100 std::unique_ptr<Module> M = parseAssemblyFile(InputFilename, Err, Context);
101 if (!M.get()) {
102 Err.print(argv[0], errs());
103 return 1;
104 }
105
106 if (!DisableVerify) {
107 std::string ErrorStr;
108 raw_string_ostream OS(ErrorStr);
109 if (verifyModule(*M.get(), &OS)) {
110 errs() << argv[0]
111 << ": assembly parsed, but does not verify as correct!\n";
112 errs() << OS.str();
113 return 1;
114 }
115 }
116
117 if (DumpAsm)
118 errs() << "Here's the assembly:\n" << *M.get();
119
120 if (!DisableOutput)
121 WriteOutputFile(M.get());
122
123 return 0;
124 }
125