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