1 //===-- llc.cpp - Implement the LLVM Compiler -----------------------------===//
3 // This is the llc compiler driver.
5 //===----------------------------------------------------------------------===//
7 #include "llvm/Bytecode/Reader.h"
8 #include "llvm/Target/Sparc.h"
9 #include "llvm/Target/TargetMachine.h"
10 #include "llvm/Transforms/Instrumentation/TraceValues.h"
11 #include "llvm/Transforms/LowerAllocations.h"
12 #include "llvm/Transforms/HoistPHIConstants.h"
13 #include "llvm/Assembly/PrintModulePass.h"
14 #include "llvm/Bytecode/WriteBytecodePass.h"
15 #include "llvm/Transforms/ConstantMerge.h"
16 #include "llvm/Module.h"
17 #include "llvm/Method.h"
18 #include "Support/CommandLine.h"
24 cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
25 cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
26 cl::Flag Force ("f", "Overwrite output files");
27 cl::Flag DumpAsm ("d", "Print bytecode before native code generation",
29 cl::Flag DoNotEmitAssembly("noasm", "Do not emit assembly code", cl::Hidden);
30 cl::Flag TraceBBValues ("trace",
31 "Trace values at basic block and method exits");
32 cl::Flag TraceMethodValues("tracem", "Trace values only at method exits");
35 // GetFileNameRoot - Helper function to get the basename of a filename...
36 static inline string GetFileNameRoot(const string &InputFilename) {
37 string IFN = InputFilename;
38 string outputFilename;
39 int Len = IFN.length();
40 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
41 outputFilename = string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
45 return outputFilename;
49 //===---------------------------------------------------------------------===//
50 // GenerateCodeForTarget Pass
52 // Native code generation for a specified target.
53 //===---------------------------------------------------------------------===//
55 class GenerateCodeForTarget : public Pass {
56 TargetMachine &Target;
58 inline GenerateCodeForTarget(TargetMachine &T) : Target(T) {}
60 // doPerMethodWork - This method does the actual work of generating code for
61 // the specified method.
63 bool doPerMethodWork(Method *M) {
64 if (!M->isExternal() && Target.compileMethod(M)) {
65 cerr << "Error compiling " << InputFilename << "!\n";
74 //===---------------------------------------------------------------------===//
77 // Write assembly code to specified output stream
78 //===---------------------------------------------------------------------===//
80 class EmitAssembly : public Pass {
81 const TargetMachine &Target; // Target to compile for
82 std::ostream *Out; // Stream to print on
83 bool DeleteStream; // Delete stream in dtor?
85 inline EmitAssembly(const TargetMachine &T, std::ostream *O, bool D)
86 : Target(T), Out(O), DeleteStream(D) {}
89 virtual bool doPassFinalization(Module *M) {
90 Target.emitAssembly(M, *Out);
92 if (DeleteStream) delete Out;
98 //===---------------------------------------------------------------------===//
101 // Entry point for the llc compiler.
102 //===---------------------------------------------------------------------===//
104 int main(int argc, char **argv) {
105 cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
107 // Allocate a target... in the future this will be controllable on the
109 std::auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
110 assert(target.get() && "Could not allocate target machine!");
112 TargetMachine &Target = *target.get();
114 // Load the module to be compiled...
115 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
117 cerr << "bytecode didn't read correctly.\n";
121 // Build up all of the passes that we want to do to the module...
122 std::vector<Pass*> Passes;
124 // Hoist constants out of PHI nodes into predecessor BB's
125 Passes.push_back(new HoistPHIConstants());
127 if (TraceBBValues || TraceMethodValues) { // If tracing enabled...
128 // Insert trace code in all methods in the module
129 Passes.push_back(new InsertTraceCode(TraceBBValues,
130 TraceBBValues ||TraceMethodValues));
132 // Eliminate duplication in constant pool
133 Passes.push_back(new DynamicConstantMerge());
135 // Then write out the module with tracing code before code generation
136 assert(InputFilename != "-" &&
137 "files on stdin not supported with tracing");
138 string traceFileName = GetFileNameRoot(InputFilename) + ".trace.bc";
140 if (!Force && !std::ifstream(OutputFilename.c_str())) {
141 // If force is not specified, make sure not to overwrite a file!
142 cerr << "Error opening '" << OutputFilename << "': File exists!\n"
143 << "Use -f command line argument to force output\n";
147 std::ostream *os = new std::ofstream(traceFileName.c_str());
149 cerr << "Error opening " << traceFileName
150 << "! SKIPPING OUTPUT OF TRACE CODE\n";
155 Passes.push_back(new WriteBytecodePass(os, true));
158 // Replace malloc and free instructions with library calls.
159 // Do this after tracing until lli implements these lib calls.
160 // For now, it will emulate malloc and free internally.
161 Passes.push_back(new LowerAllocations(Target.DataLayout));
163 // If LLVM dumping after transformations is requested, add it to the pipeline
165 Passes.push_back(new PrintModulePass("Code after xformations: \n",&cerr));
167 // Generate Target code...
168 Passes.push_back(new GenerateCodeForTarget(Target));
170 if (!DoNotEmitAssembly) { // If asm output is enabled...
171 // Figure out where we are going to send the output...
172 std::ostream *Out = 0;
173 if (OutputFilename != "") { // Specified an output filename?
174 if (!Force && !std::ifstream(OutputFilename.c_str())) {
175 // If force is not specified, make sure not to overwrite a file!
176 cerr << "Error opening '" << OutputFilename << "': File exists!\n"
177 << "Use -f command line argument to force output\n";
180 Out = new std::ofstream(OutputFilename.c_str());
182 if (InputFilename == "-") {
183 OutputFilename = "-";
186 string OutputFilename = GetFileNameRoot(InputFilename);
187 OutputFilename += ".s";
189 if (!Force && !std::ifstream(OutputFilename.c_str())) {
190 // If force is not specified, make sure not to overwrite a file!
191 cerr << "Error opening '" << OutputFilename << "': File exists!\n"
192 << "Use -f command line argument to force output\n";
196 Out = new std::ofstream(OutputFilename.c_str());
198 cerr << "Error opening " << OutputFilename << "!\n";
205 // Output assembly language to the .s file
206 Passes.push_back(new EmitAssembly(Target, Out, Out != &std::cout));
209 // Run our queue of passes all at once now, efficiently. This form of
210 // runAllPasses frees the Pass objects after runAllPasses completes.
211 Pass::runAllPassesAndFree(M.get(), Passes);