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/Support/CommandLine.h"
17 #include "llvm/Module.h"
18 #include "llvm/Method.h"
23 cl::String InputFilename ("", "Input filename", cl::NoFlags, "-");
24 cl::String OutputFilename("o", "Output filename", cl::NoFlags, "");
25 cl::Flag Force ("f", "Overwrite output files");
26 cl::Flag DumpAsm ("d", "Print bytecode before native code generation",
28 cl::Flag DoNotEmitAssembly("noasm", "Do not emit assembly code", cl::Hidden);
29 cl::Flag TraceBBValues ("trace",
30 "Trace values at basic block and method exits");
31 cl::Flag TraceMethodValues("tracem", "Trace values only at method exits");
34 // GetFileNameRoot - Helper function to get the basename of a filename...
35 static inline string GetFileNameRoot(const string &InputFilename) {
36 string IFN = InputFilename;
37 string outputFilename;
38 int Len = IFN.length();
39 if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
40 outputFilename = string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
44 return outputFilename;
48 //===---------------------------------------------------------------------===//
49 // GenerateCodeForTarget Pass
51 // Native code generation for a specified target.
52 //===---------------------------------------------------------------------===//
54 class GenerateCodeForTarget : public Pass {
55 TargetMachine &Target;
57 inline GenerateCodeForTarget(TargetMachine &T) : Target(T) {}
59 // doPerMethodWork - This method does the actual work of generating code for
60 // the specified method.
62 bool doPerMethodWork(Method *M) {
63 if (!M->isExternal() && Target.compileMethod(M)) {
64 cerr << "Error compiling " << InputFilename << "!\n";
73 //===---------------------------------------------------------------------===//
76 // Write assembly code to specified output stream
77 //===---------------------------------------------------------------------===//
79 class EmitAssembly : public Pass {
80 const TargetMachine &Target; // Target to compile for
81 ostream *Out; // Stream to print on
82 bool DeleteStream; // Delete stream in dtor?
84 inline EmitAssembly(const TargetMachine &T, ostream *O, bool D)
85 : Target(T), Out(O), DeleteStream(D) {}
88 virtual bool doPassFinalization(Module *M) {
89 Target.emitAssembly(M, *Out);
91 if (DeleteStream) delete Out;
97 //===---------------------------------------------------------------------===//
100 // Entry point for the llc compiler.
101 //===---------------------------------------------------------------------===//
103 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 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 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 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";
139 ostream *os = new ofstream(traceFileName.c_str(),
140 (Force ? 0 : ios::noreplace)|ios::out);
142 cerr << "Error opening " << traceFileName
143 << "! SKIPPING OUTPUT OF TRACE CODE\n";
148 Passes.push_back(new WriteBytecodePass(os, true));
151 // Replace malloc and free instructions with library calls.
152 // Do this after tracing until lli implements these lib calls.
153 // For now, it will emulate malloc and free internally.
154 Passes.push_back(new LowerAllocations(Target.DataLayout));
156 // If LLVM dumping after transformations is requested, add it to the pipeline
158 Passes.push_back(new PrintModulePass("Code after xformations: \n",&cerr));
160 // Generate Target code...
161 Passes.push_back(new GenerateCodeForTarget(Target));
163 if (!DoNotEmitAssembly) { // If asm output is enabled...
164 // Figure out where we are going to send the output...
166 if (OutputFilename != "") { // Specified an output filename?
167 Out = new ofstream(OutputFilename.c_str(),
168 (Force ? 0 : ios::noreplace)|ios::out);
170 if (InputFilename == "-") {
171 OutputFilename = "-";
174 string OutputFilename = GetFileNameRoot(InputFilename);
175 OutputFilename += ".s";
176 Out = new ofstream(OutputFilename.c_str(),
177 (Force ? 0 : ios::noreplace)|ios::out);
179 cerr << "Error opening " << OutputFilename << "!\n";
186 // Output assembly language to the .s file
187 Passes.push_back(new EmitAssembly(Target, Out, Out != &cout));
190 // Run our queue of passes all at once now, efficiently. This form of
191 // runAllPasses frees the Pass objects after runAllPasses completes.
192 Pass::runAllPassesAndFree(M.get(), Passes);