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/Transforms/PrintModulePass.h"
14 #include "llvm/Support/CommandLine.h"
15 #include "llvm/Module.h"
16 #include "llvm/Method.h"
21 cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
22 cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
23 cl::Flag Force ("f", "Overwrite output files");
24 cl::Flag DumpAsm ("d", "Print bytecode before native code generation",
26 cl::Flag DoNotEmitAssembly("noasm", "Do not emit assembly code", cl::Hidden);
27 cl::Flag TraceBBValues ("trace",
28 "Trace values at basic block and method exits");
29 cl::Flag TraceMethodValues("tracem", "Trace values only at method exits");
30 cl::Flag DebugTrace ("dumptrace",
31 "output trace code to a <fn>.trace.ll file",
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 ostream *Out; // Stream to print on
83 bool DeleteStream; // Delete stream in dtor?
85 inline EmitAssembly(const TargetMachine &T, ostream *O, bool D)
86 : Target(T), Out(O), DeleteStream(D) {}
89 virtual bool doPassFinalization(Module *M) {
90 // TODO: This should be performed as a moduleCleanup function, but we don't
92 Target.emitAssembly(M, *Out);
94 if (DeleteStream) delete Out;
100 //===---------------------------------------------------------------------===//
103 // Entry point for the llc compiler.
104 //===---------------------------------------------------------------------===//
106 int main(int argc, char **argv) {
107 cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
109 // Allocate a target... in the future this will be controllable on the
111 auto_ptr<TargetMachine> target(allocateSparcTargetMachine());
112 assert(target.get() && "Could not allocate target machine!");
114 TargetMachine &Target = *target.get();
116 // Load the module to be compiled...
117 auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
119 cerr << "bytecode didn't read correctly.\n";
123 // Build up all of the passes that we want to do to the module...
124 vector<Pass*> Passes;
126 // Replace malloc and free instructions with library calls
127 Passes.push_back(new LowerAllocations(Target.DataLayout));
129 // Hoist constants out of PHI nodes into predecessor BB's
130 Passes.push_back(new HoistPHIConstants());
132 if (TraceBBValues || TraceMethodValues) // If tracing enabled...
133 // Insert trace code in all methods in the module
134 Passes.push_back(new InsertTraceCode(TraceBBValues,
135 TraceBBValues || TraceMethodValues));
138 if (DebugTrace) { // If Trace Debugging is enabled...
139 // Then write the module with tracing code out in assembly form
140 assert(InputFilename != "-" && "files on stdin not supported with tracing");
141 string traceFileName = GetFileNameRoot(InputFilename) + ".trace.ll";
143 ostream *os = new ofstream(traceFileName.c_str(),
144 (Force ? 0 : ios::noreplace)|ios::out);
146 cerr << "Error opening " << traceFileName << "!\n";
151 Passes.push_back(new PrintModulePass("", os, true));
154 // If LLVM dumping after transformations is requested, add it to the pipeline
156 Passes.push_back(new PrintModulePass("Method after xformations: \n",&cerr));
158 // Generate Target code...
159 Passes.push_back(new GenerateCodeForTarget(Target));
161 if (!DoNotEmitAssembly) { // If asm output is enabled...
162 // Figure out where we are going to send the output...
164 if (OutputFilename != "") { // Specified an output filename?
165 Out = new ofstream(OutputFilename.c_str(),
166 (Force ? 0 : ios::noreplace)|ios::out);
168 if (InputFilename == "-") {
169 OutputFilename = "-";
172 string OutputFilename = GetFileNameRoot(InputFilename);
173 OutputFilename += ".s";
174 Out = new ofstream(OutputFilename.c_str(),
175 (Force ? 0 : ios::noreplace)|ios::out);
177 cerr << "Error opening " << OutputFilename << "!\n";
184 // Output assembly language to the .s file
185 Passes.push_back(new EmitAssembly(Target, Out, Out != &cout));
188 // Run our queue of passes all at once now, efficiently. This form of
189 // runAllPasses frees the Pass objects after runAllPasses completes.
190 Pass::runAllPassesAndFree(M.get(), Passes);