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/Analysis/Verifier.h"
20 #include "llvm/Assembly/Parser.h"
21 #include "llvm/Bitcode/ReaderWriter.h"
22 #include "llvm/IR/Module.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/ManagedStatic.h"
25 #include "llvm/Support/PrettyStackTrace.h"
26 #include "llvm/Support/Signals.h"
27 #include "llvm/Support/SourceMgr.h"
28 #include "llvm/Support/SystemUtils.h"
29 #include "llvm/Support/ToolOutputFile.h"
30 #include <memory>
31 using namespace llvm;
32
33 static cl::opt<std::string>
34 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
35
36 static cl::opt<std::string>
37 OutputFilename("o", cl::desc("Override output filename"),
38 cl::value_desc("filename"));
39
40 static cl::opt<bool>
41 Force("f", cl::desc("Enable binary output on terminals"));
42
43 static cl::opt<bool>
44 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
45
46 static cl::opt<bool>
47 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
48
49 static cl::opt<bool>
50 DisableVerify("disable-verify", cl::Hidden,
51 cl::desc("Do not run verifier on input LLVM (dangerous!)"));
52
WriteOutputFile(const Module * M)53 static void WriteOutputFile(const Module *M) {
54 // Infer the output filename if needed.
55 if (OutputFilename.empty()) {
56 if (InputFilename == "-") {
57 OutputFilename = "-";
58 } else {
59 std::string IFN = InputFilename;
60 int Len = IFN.length();
61 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
62 // Source ends in .ll
63 OutputFilename = std::string(IFN.begin(), IFN.end()-3);
64 } else {
65 OutputFilename = IFN; // Append a .bc to it
66 }
67 OutputFilename += ".bc";
68 }
69 }
70
71 std::string ErrorInfo;
72 OwningPtr<tool_output_file> Out(new tool_output_file(
73 OutputFilename.c_str(), ErrorInfo, sys::fs::F_Binary));
74 if (!ErrorInfo.empty()) {
75 errs() << ErrorInfo << '\n';
76 exit(1);
77 }
78
79 if (Force || !CheckBitcodeOutputToConsole(Out->os(), true))
80 WriteBitcodeToFile(M, Out->os());
81
82 // Declare success.
83 Out->keep();
84 }
85
main(int argc,char ** argv)86 int main(int argc, char **argv) {
87 // Print a stack trace if we signal out.
88 sys::PrintStackTraceOnErrorSignal();
89 PrettyStackTraceProgram X(argc, argv);
90 LLVMContext &Context = getGlobalContext();
91 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
92 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
93
94 // Parse the file now...
95 SMDiagnostic Err;
96 OwningPtr<Module> M(ParseAssemblyFile(InputFilename, Err, Context));
97 if (M.get() == 0) {
98 Err.print(argv[0], errs());
99 return 1;
100 }
101
102 if (!DisableVerify) {
103 std::string Err;
104 if (verifyModule(*M.get(), ReturnStatusAction, &Err)) {
105 errs() << argv[0]
106 << ": assembly parsed, but does not verify as correct!\n";
107 errs() << Err;
108 return 1;
109 }
110 }
111
112 if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
113
114 if (!DisableOutput)
115 WriteOutputFile(M.get());
116
117 return 0;
118 }
119