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 "BitWriter_3_2/ReaderWriter_3_2.h"
33 #include "BitWriter_2_9/ReaderWriter_2_9.h"
34 #include "BitWriter_2_9_func/ReaderWriter_2_9_func.h"
35
36 #include <memory>
37 using namespace llvm;
38
39 static cl::opt<std::string>
40 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
41
42 static cl::opt<std::string>
43 OutputFilename("o", cl::desc("Override output filename"),
44 cl::value_desc("filename"));
45
46 static cl::opt<bool>
47 Force("f", cl::desc("Enable binary output on terminals"));
48
49 static cl::opt<bool>
50 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
51
52 static cl::opt<bool>
53 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
54
55 static cl::opt<bool>
56 DisableVerify("disable-verify", cl::Hidden,
57 cl::desc("Do not run verifier on input LLVM (dangerous!)"));
58
59 enum BCVersion {
60 BC29, BC29Func, BC32, BCHEAD
61 };
62
63 cl::opt<BCVersion> BitcodeVersion("bitcode-version",
64 cl::desc("Set the bitcode version to be written:"),
65 cl::values(
66 clEnumValN(BC29, "BC29", "Version 2.9"),
67 clEnumVal(BC29Func, "Version 2.9 func"),
68 clEnumVal(BC32, "Version 3.2"),
69 clEnumVal(BCHEAD, "Most current version"),
70 clEnumValEnd), cl::init(BC32));
71
WriteOutputFile(const Module * M)72 static void WriteOutputFile(const Module *M) {
73 // Infer the output filename if needed.
74 if (OutputFilename.empty()) {
75 if (InputFilename == "-") {
76 OutputFilename = "-";
77 } else {
78 std::string IFN = InputFilename;
79 int Len = IFN.length();
80 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
81 // Source ends in .ll
82 OutputFilename = std::string(IFN.begin(), IFN.end()-3);
83 } else {
84 OutputFilename = IFN; // Append a .bc to it
85 }
86 OutputFilename += ".bc";
87 }
88 }
89
90 std::error_code EC;
91 std::unique_ptr<tool_output_file> Out
92 (new tool_output_file(OutputFilename.c_str(), EC, llvm::sys::fs::F_None));
93 if (EC) {
94 // TODO(srhines): This isn't actually very specific and needs cleanup.
95 errs() << EC.message() << '\n';
96 exit(1);
97 }
98
99 if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) {
100 switch(BitcodeVersion) {
101 case BC29:
102 llvm_2_9::WriteBitcodeToFile(M, Out->os());
103 break;
104 case BC29Func:
105 llvm_2_9_func::WriteBitcodeToFile(M, Out->os());
106 break;
107 case BC32:
108 llvm_3_2::WriteBitcodeToFile(M, Out->os());
109 break;
110 case BCHEAD:
111 llvm::WriteBitcodeToFile(M, Out->os());
112 break;
113 }
114 }
115
116 // Declare success.
117 Out->keep();
118 }
119
main(int argc,char ** argv)120 int main(int argc, char **argv) {
121 // Print a stack trace if we signal out.
122 sys::PrintStackTraceOnErrorSignal();
123 PrettyStackTraceProgram X(argc, argv);
124 LLVMContext &Context = getGlobalContext();
125 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
126 cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
127
128 // Parse the file now...
129 SMDiagnostic Err;
130 std::unique_ptr<Module> M(parseAssemblyFile(InputFilename, Err, Context));
131 if (M.get() == 0) {
132 Err.print(argv[0], errs());
133 return 1;
134 }
135
136 if (!DisableVerify) {
137 std::string Err;
138 raw_string_ostream stream(Err);
139 if (verifyModule(*M.get(), &stream)) {
140 errs() << argv[0]
141 << ": assembly parsed, but does not verify as correct!\n";
142 errs() << Err;
143 return 1;
144 }
145 }
146
147 if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
148
149 if (!DisableOutput)
150 WriteOutputFile(M.get());
151
152 return 0;
153 }
154