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>
38 using namespace llvm;
39
40 static cl::opt<std::string>
41 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
42
43 static cl::opt<std::string>
44 OutputFilename("o", cl::desc("Override output filename"),
45 cl::value_desc("filename"));
46
47 static cl::opt<bool>
48 Force("f", cl::desc("Enable binary output on terminals"));
49
50 static cl::opt<bool>
51 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
52
53 static cl::opt<uint32_t>
54 TargetAPI("target-api", cl::desc("Specify RenderScript target API version "
55 "(0 = development API) (default is 0)"),
56 cl::init(0));
57
58 static cl::opt<bool>
59 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
60
61 static cl::opt<bool>
62 DisableVerify("disable-verify", cl::Hidden,
63 cl::desc("Do not run verifier on input LLVM (dangerous!)"));
64
stripUnknownAttributes(llvm::Module * M)65 static void stripUnknownAttributes(llvm::Module *M) {
66 for (llvm::Function &F : *M)
67 slang::stripUnknownAttributes(F);
68 }
69
WriteOutputFile(const Module * M,uint32_t ModuleTargetAPI)70 static 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
main(int argc,char ** argv)110 int 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