LLVMTargetMachine.cpp revision 459525df1e003597077197b5f802bd5d9cd7d94c
1//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===// 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 file implements the LLVMTargetMachine class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/Target/TargetMachine.h" 15#include "llvm/PassManager.h" 16#include "llvm/Pass.h" 17#include "llvm/Assembly/PrintModulePass.h" 18#include "llvm/Analysis/LoopPass.h" 19#include "llvm/CodeGen/Passes.h" 20#include "llvm/CodeGen/Collector.h" 21#include "llvm/Target/TargetOptions.h" 22#include "llvm/Transforms/Scalar.h" 23#include "llvm/Support/CommandLine.h" 24using namespace llvm; 25 26static cl::opt<bool> PrintLSR("print-lsr-output", cl::Hidden, 27 cl::desc("Print LLVM IR produced by the loop-reduce pass")); 28static cl::opt<bool> PrintISelInput("print-isel-input", cl::Hidden, 29 cl::desc("Print LLVM IR input to isel pass")); 30static cl::opt<bool> PrintEmittedAsm("print-emitted-asm", cl::Hidden, 31 cl::desc("Dump emitter generated instructions as assembly")); 32static cl::opt<bool> PrintGCInfo("print-gc", cl::Hidden, 33 cl::desc("Dump garbage collector data")); 34 35// Hidden options to help debugging 36static cl::opt<bool> 37EnableSinking("enable-sinking", cl::init(false), cl::Hidden, 38 cl::desc("Perform sinking on machine code")); 39static cl::opt<bool> 40PerformLICM("machine-licm", 41 cl::init(false), cl::Hidden, 42 cl::desc("Perform loop-invariant code motion on machine code")); 43 44// When this works it will be on by default. 45static cl::opt<bool> 46DisablePostRAScheduler("disable-post-RA-scheduler", 47 cl::desc("Disable scheduling after register allocation"), 48 cl::init(true)); 49 50FileModel::Model 51LLVMTargetMachine::addPassesToEmitFile(FunctionPassManager &PM, 52 std::ostream &Out, 53 CodeGenFileType FileType, 54 bool Fast) { 55 // Standard LLVM-Level Passes. 56 57 // Run loop strength reduction before anything else. 58 if (!Fast) { 59 PM.add(createLoopStrengthReducePass(getTargetLowering())); 60 if (PrintLSR) 61 PM.add(new PrintFunctionPass("\n\n*** Code after LSR *** \n", &cerr)); 62 } 63 64 PM.add(createGCLoweringPass()); 65 66 if (!ExceptionHandling) 67 PM.add(createLowerInvokePass(getTargetLowering())); 68 69 // Make sure that no unreachable blocks are instruction selected. 70 PM.add(createUnreachableBlockEliminationPass()); 71 72 if (!Fast) 73 PM.add(createCodeGenPreparePass(getTargetLowering())); 74 75 if (PrintISelInput) 76 PM.add(new PrintFunctionPass("\n\n*** Final LLVM Code input to ISel *** \n", 77 &cerr)); 78 79 // Ask the target for an isel. 80 if (addInstSelector(PM, Fast)) 81 return FileModel::Error; 82 83 // Print the instruction selected machine code... 84 if (PrintMachineCode) 85 PM.add(createMachineFunctionPrinterPass(cerr)); 86 87 if (PerformLICM) 88 PM.add(createMachineLICMPass()); 89 90 if (EnableSinking) 91 PM.add(createMachineSinkingPass()); 92 93 // Perform register allocation to convert to a concrete x86 representation 94 PM.add(createRegisterAllocator()); 95 96 if (PrintMachineCode) 97 PM.add(createMachineFunctionPrinterPass(cerr)); 98 99 PM.add(createLowerSubregsPass()); 100 101 if (PrintMachineCode) // Print the subreg lowered code 102 PM.add(createMachineFunctionPrinterPass(cerr)); 103 104 // Run post-ra passes. 105 if (addPostRegAlloc(PM, Fast) && PrintMachineCode) 106 PM.add(createMachineFunctionPrinterPass(cerr)); 107 108 // Insert prolog/epilog code. Eliminate abstract frame index references... 109 PM.add(createPrologEpilogCodeInserter()); 110 111 // Second pass scheduler. 112 if (!Fast && !DisablePostRAScheduler) 113 PM.add(createPostRAScheduler()); 114 115 // Branch folding must be run after regalloc and prolog/epilog insertion. 116 if (!Fast) 117 PM.add(createBranchFoldingPass(getEnableTailMergeDefault())); 118 119 PM.add(createGCMachineCodeAnalysisPass()); 120 if (PrintMachineCode) 121 PM.add(createMachineFunctionPrinterPass(cerr)); 122 123 if (PrintGCInfo) 124 PM.add(createCollectorMetadataPrinter(*cerr)); 125 126 // Fold redundant debug labels. 127 PM.add(createDebugLabelFoldingPass()); 128 129 if (PrintMachineCode) // Print the register-allocated code 130 PM.add(createMachineFunctionPrinterPass(cerr)); 131 132 if (addPreEmitPass(PM, Fast) && PrintMachineCode) 133 PM.add(createMachineFunctionPrinterPass(cerr)); 134 135 switch (FileType) { 136 default: 137 break; 138 case TargetMachine::AssemblyFile: 139 if (addAssemblyEmitter(PM, Fast, Out)) 140 return FileModel::Error; 141 return FileModel::AsmFile; 142 case TargetMachine::ObjectFile: 143 if (getMachOWriterInfo()) 144 return FileModel::MachOFile; 145 else if (getELFWriterInfo()) 146 return FileModel::ElfFile; 147 } 148 149 return FileModel::Error; 150} 151 152/// addPassesToEmitFileFinish - If the passes to emit the specified file had to 153/// be split up (e.g., to add an object writer pass), this method can be used to 154/// finish up adding passes to emit the file, if necessary. 155bool LLVMTargetMachine::addPassesToEmitFileFinish(FunctionPassManager &PM, 156 MachineCodeEmitter *MCE, 157 bool Fast) { 158 if (MCE) 159 addSimpleCodeEmitter(PM, Fast, PrintEmittedAsm, *MCE); 160 161 PM.add(createCollectorMetadataDeleter()); 162 163 // Delete machine code for this function 164 PM.add(createMachineCodeDeleter()); 165 166 return false; // success! 167} 168 169/// addPassesToEmitMachineCode - Add passes to the specified pass manager to 170/// get machine code emitted. This uses a MachineCodeEmitter object to handle 171/// actually outputting the machine code and resolving things like the address 172/// of functions. This method should returns true if machine code emission is 173/// not supported. 174/// 175bool LLVMTargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM, 176 MachineCodeEmitter &MCE, 177 bool Fast) { 178 // Standard LLVM-Level Passes. 179 180 // Run loop strength reduction before anything else. 181 if (!Fast) { 182 PM.add(createLoopStrengthReducePass(getTargetLowering())); 183 if (PrintLSR) 184 PM.add(new PrintFunctionPass("\n\n*** Code after LSR *** \n", &cerr)); 185 } 186 187 PM.add(createGCLoweringPass()); 188 189 // FIXME: Implement the invoke/unwind instructions! 190 PM.add(createLowerInvokePass(getTargetLowering())); 191 192 // Make sure that no unreachable blocks are instruction selected. 193 PM.add(createUnreachableBlockEliminationPass()); 194 195 if (!Fast) 196 PM.add(createCodeGenPreparePass(getTargetLowering())); 197 198 if (PrintISelInput) 199 PM.add(new PrintFunctionPass("\n\n*** Final LLVM Code input to ISel *** \n", 200 &cerr)); 201 202 // Ask the target for an isel. 203 if (addInstSelector(PM, Fast)) 204 return true; 205 206 // Print the instruction selected machine code... 207 if (PrintMachineCode) 208 PM.add(createMachineFunctionPrinterPass(cerr)); 209 210 if (PerformLICM) 211 PM.add(createMachineLICMPass()); 212 213 if (EnableSinking) 214 PM.add(createMachineSinkingPass()); 215 216 // Perform register allocation to convert to a concrete x86 representation 217 PM.add(createRegisterAllocator()); 218 219 if (PrintMachineCode) 220 PM.add(createMachineFunctionPrinterPass(cerr)); 221 222 PM.add(createLowerSubregsPass()); 223 224 if (PrintMachineCode) // Print the subreg lowered code 225 PM.add(createMachineFunctionPrinterPass(cerr)); 226 227 // Run post-ra passes. 228 if (addPostRegAlloc(PM, Fast) && PrintMachineCode) 229 PM.add(createMachineFunctionPrinterPass(cerr)); 230 231 // Insert prolog/epilog code. Eliminate abstract frame index references... 232 PM.add(createPrologEpilogCodeInserter()); 233 234 if (PrintMachineCode) // Print the register-allocated code 235 PM.add(createMachineFunctionPrinterPass(cerr)); 236 237 // Second pass scheduler. 238 if (!Fast) 239 PM.add(createPostRAScheduler()); 240 241 // Branch folding must be run after regalloc and prolog/epilog insertion. 242 if (!Fast) 243 PM.add(createBranchFoldingPass(getEnableTailMergeDefault())); 244 245 PM.add(createGCMachineCodeAnalysisPass()); 246 if (PrintMachineCode) 247 PM.add(createMachineFunctionPrinterPass(cerr)); 248 249 if (PrintGCInfo) 250 PM.add(createCollectorMetadataPrinter(*cerr)); 251 252 if (addPreEmitPass(PM, Fast) && PrintMachineCode) 253 PM.add(createMachineFunctionPrinterPass(cerr)); 254 255 addCodeEmitter(PM, Fast, PrintEmittedAsm, MCE); 256 257 PM.add(createCollectorMetadataDeleter()); 258 259 // Delete machine code for this function 260 PM.add(createMachineCodeDeleter()); 261 262 return false; // success! 263} 264