1 //===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the LLVMTargetMachine class.
12 //===----------------------------------------------------------------------===//
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/Target/TargetOptions.h"
21 #include "llvm/Transforms/Scalar.h"
22 #include "llvm/Support/CommandLine.h"
25 static cl::opt<bool> PrintLSR("print-lsr-output", cl::Hidden,
26 cl::desc("Print LLVM IR produced by the loop-reduce pass"));
27 static cl::opt<bool> PrintISelInput("print-isel-input", cl::Hidden,
28 cl::desc("Print LLVM IR input to isel pass"));
29 static cl::opt<bool> PrintEmittedAsm("print-emitted-asm", cl::Hidden,
30 cl::desc("Dump emitter generated instructions as assembly"));
33 LLVMTargetMachine::addPassesToEmitFile(FunctionPassManager &PM,
35 CodeGenFileType FileType,
37 // Standard LLVM-Level Passes.
39 // Run loop strength reduction before anything else.
41 PM.add(createLoopStrengthReducePass(getTargetLowering()));
43 PM.add(new PrintFunctionPass("\n\n*** Code after LSR *** \n", &cerr));
46 // FIXME: Implement efficient support for garbage collection intrinsics.
47 PM.add(createLowerGCPass());
49 if (!ExceptionHandling)
50 PM.add(createLowerInvokePass(getTargetLowering()));
52 // Make sure that no unreachable blocks are instruction selected.
53 PM.add(createUnreachableBlockEliminationPass());
56 PM.add(createCodeGenPreparePass(getTargetLowering()));
59 PM.add(new PrintFunctionPass("\n\n*** Final LLVM Code input to ISel *** \n",
62 // Ask the target for an isel.
63 if (addInstSelector(PM, Fast))
64 return FileModel::Error;
66 // Print the instruction selected machine code...
68 PM.add(createMachineFunctionPrinterPass(cerr));
70 // Perform register allocation to convert to a concrete x86 representation
71 PM.add(createRegisterAllocator());
74 PM.add(createMachineFunctionPrinterPass(cerr));
76 PM.add(createLowerSubregsPass());
78 if (PrintMachineCode) // Print the subreg lowered code
79 PM.add(createMachineFunctionPrinterPass(cerr));
81 // Run post-ra passes.
82 if (addPostRegAlloc(PM, Fast) && PrintMachineCode)
83 PM.add(createMachineFunctionPrinterPass(cerr));
85 // Insert prolog/epilog code. Eliminate abstract frame index references...
86 PM.add(createPrologEpilogCodeInserter());
88 // Second pass scheduler.
90 PM.add(createPostRAScheduler());
92 // Branch folding must be run after regalloc and prolog/epilog insertion.
94 PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
96 // Fold redundant debug labels.
97 PM.add(createDebugLabelFoldingPass());
99 if (PrintMachineCode) // Print the register-allocated code
100 PM.add(createMachineFunctionPrinterPass(cerr));
102 if (addPreEmitPass(PM, Fast) && PrintMachineCode)
103 PM.add(createMachineFunctionPrinterPass(cerr));
108 case TargetMachine::AssemblyFile:
109 if (addAssemblyEmitter(PM, Fast, Out))
110 return FileModel::Error;
111 return FileModel::AsmFile;
112 case TargetMachine::ObjectFile:
113 if (getMachOWriterInfo())
114 return FileModel::MachOFile;
115 else if (getELFWriterInfo())
116 return FileModel::ElfFile;
119 return FileModel::Error;
122 /// addPassesToEmitFileFinish - If the passes to emit the specified file had to
123 /// be split up (e.g., to add an object writer pass), this method can be used to
124 /// finish up adding passes to emit the file, if necessary.
125 bool LLVMTargetMachine::addPassesToEmitFileFinish(FunctionPassManager &PM,
126 MachineCodeEmitter *MCE,
129 addSimpleCodeEmitter(PM, Fast, PrintEmittedAsm, *MCE);
131 // Delete machine code for this function
132 PM.add(createMachineCodeDeleter());
134 return false; // success!
137 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
138 /// get machine code emitted. This uses a MachineCodeEmitter object to handle
139 /// actually outputting the machine code and resolving things like the address
140 /// of functions. This method should returns true if machine code emission is
143 bool LLVMTargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
144 MachineCodeEmitter &MCE,
146 // Standard LLVM-Level Passes.
148 // Run loop strength reduction before anything else.
150 PM.add(createLoopStrengthReducePass(getTargetLowering()));
152 PM.add(new PrintFunctionPass("\n\n*** Code after LSR *** \n", &cerr));
155 // FIXME: Implement efficient support for garbage collection intrinsics.
156 PM.add(createLowerGCPass());
158 // FIXME: Implement the invoke/unwind instructions!
159 PM.add(createLowerInvokePass(getTargetLowering()));
161 // Make sure that no unreachable blocks are instruction selected.
162 PM.add(createUnreachableBlockEliminationPass());
165 PM.add(createCodeGenPreparePass(getTargetLowering()));
168 PM.add(new PrintFunctionPass("\n\n*** Final LLVM Code input to ISel *** \n",
171 // Ask the target for an isel.
172 if (addInstSelector(PM, Fast))
175 // Print the instruction selected machine code...
176 if (PrintMachineCode)
177 PM.add(createMachineFunctionPrinterPass(cerr));
179 // Perform register allocation to convert to a concrete x86 representation
180 PM.add(createRegisterAllocator());
182 if (PrintMachineCode)
183 PM.add(createMachineFunctionPrinterPass(cerr));
185 PM.add(createLowerSubregsPass());
187 if (PrintMachineCode) // Print the subreg lowered code
188 PM.add(createMachineFunctionPrinterPass(cerr));
190 // Run post-ra passes.
191 if (addPostRegAlloc(PM, Fast) && PrintMachineCode)
192 PM.add(createMachineFunctionPrinterPass(cerr));
194 // Insert prolog/epilog code. Eliminate abstract frame index references...
195 PM.add(createPrologEpilogCodeInserter());
197 if (PrintMachineCode) // Print the register-allocated code
198 PM.add(createMachineFunctionPrinterPass(cerr));
200 // Second pass scheduler.
202 PM.add(createPostRAScheduler());
204 // Branch folding must be run after regalloc and prolog/epilog insertion.
206 PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
208 if (addPreEmitPass(PM, Fast) && PrintMachineCode)
209 PM.add(createMachineFunctionPrinterPass(cerr));
211 addCodeEmitter(PM, Fast, PrintEmittedAsm, MCE);
213 // Delete machine code for this function
214 PM.add(createMachineCodeDeleter());
216 return false; // success!