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"));
31 LLVMTargetMachine::addPassesToEmitFile(FunctionPassManager &PM,
33 CodeGenFileType FileType,
35 // Standard LLVM-Level Passes.
37 // Run loop strength reduction before anything else.
39 PM.add(createLoopStrengthReducePass(getTargetLowering()));
41 PM.add(new PrintFunctionPass("\n\n*** Code after LSR *** \n", &cerr));
44 // FIXME: Implement efficient support for garbage collection intrinsics.
45 PM.add(createLowerGCPass());
47 if (!ExceptionHandling)
48 PM.add(createLowerInvokePass(getTargetLowering()));
50 // Make sure that no unreachable blocks are instruction selected.
51 PM.add(createUnreachableBlockEliminationPass());
54 PM.add(createCodeGenPreparePass(getTargetLowering()));
57 PM.add(new PrintFunctionPass("\n\n*** Final LLVM Code input to ISel *** \n",
60 // Ask the target for an isel.
61 if (addInstSelector(PM, Fast))
62 return FileModel::Error;
64 // Print the instruction selected machine code...
66 PM.add(createMachineFunctionPrinterPass(cerr));
68 // Perform register allocation to convert to a concrete x86 representation
69 PM.add(createRegisterAllocator());
72 PM.add(createMachineFunctionPrinterPass(cerr));
74 // Run post-ra passes.
75 if (addPostRegAlloc(PM, Fast) && PrintMachineCode)
76 PM.add(createMachineFunctionPrinterPass(cerr));
78 // Insert prolog/epilog code. Eliminate abstract frame index references...
79 PM.add(createPrologEpilogCodeInserter());
81 // Second pass scheduler.
82 PM.add(createPostRAScheduler());
84 // Branch folding must be run after regalloc and prolog/epilog insertion.
86 PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
88 // Fold redundant debug labels.
89 PM.add(createDebugLabelFoldingPass());
91 if (PrintMachineCode) // Print the register-allocated code
92 PM.add(createMachineFunctionPrinterPass(cerr));
94 if (addPreEmitPass(PM, Fast) && PrintMachineCode)
95 PM.add(createMachineFunctionPrinterPass(cerr));
100 case TargetMachine::AssemblyFile:
101 if (addAssemblyEmitter(PM, Fast, Out))
102 return FileModel::Error;
103 return FileModel::AsmFile;
104 case TargetMachine::ObjectFile:
105 if (getMachOWriterInfo())
106 return FileModel::MachOFile;
107 else if (getELFWriterInfo())
108 return FileModel::ElfFile;
111 return FileModel::Error;
114 /// addPassesToEmitFileFinish - If the passes to emit the specified file had to
115 /// be split up (e.g., to add an object writer pass), this method can be used to
116 /// finish up adding passes to emit the file, if necessary.
117 bool LLVMTargetMachine::addPassesToEmitFileFinish(FunctionPassManager &PM,
118 MachineCodeEmitter *MCE,
121 addSimpleCodeEmitter(PM, Fast, *MCE);
123 // Delete machine code for this function
124 PM.add(createMachineCodeDeleter());
126 return false; // success!
129 /// addPassesToEmitMachineCode - Add passes to the specified pass manager to
130 /// get machine code emitted. This uses a MachineCodeEmitter object to handle
131 /// actually outputting the machine code and resolving things like the address
132 /// of functions. This method should returns true if machine code emission is
135 bool LLVMTargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
136 MachineCodeEmitter &MCE,
138 // Standard LLVM-Level Passes.
140 // Run loop strength reduction before anything else.
142 PM.add(createLoopStrengthReducePass(getTargetLowering()));
144 PM.add(new PrintFunctionPass("\n\n*** Code after LSR *** \n", &cerr));
147 // FIXME: Implement efficient support for garbage collection intrinsics.
148 PM.add(createLowerGCPass());
150 // FIXME: Implement the invoke/unwind instructions!
151 PM.add(createLowerInvokePass(getTargetLowering()));
153 // Make sure that no unreachable blocks are instruction selected.
154 PM.add(createUnreachableBlockEliminationPass());
157 PM.add(createCodeGenPreparePass(getTargetLowering()));
160 PM.add(new PrintFunctionPass("\n\n*** Final LLVM Code input to ISel *** \n",
163 // Ask the target for an isel.
164 if (addInstSelector(PM, Fast))
167 // Print the instruction selected machine code...
168 if (PrintMachineCode)
169 PM.add(createMachineFunctionPrinterPass(cerr));
171 // Perform register allocation to convert to a concrete x86 representation
172 PM.add(createRegisterAllocator());
174 if (PrintMachineCode)
175 PM.add(createMachineFunctionPrinterPass(cerr));
177 // Run post-ra passes.
178 if (addPostRegAlloc(PM, Fast) && PrintMachineCode)
179 PM.add(createMachineFunctionPrinterPass(cerr));
181 // Insert prolog/epilog code. Eliminate abstract frame index references...
182 PM.add(createPrologEpilogCodeInserter());
184 if (PrintMachineCode) // Print the register-allocated code
185 PM.add(createMachineFunctionPrinterPass(cerr));
187 // Second pass scheduler.
188 PM.add(createPostRAScheduler());
190 // Branch folding must be run after regalloc and prolog/epilog insertion.
192 PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
194 if (addPreEmitPass(PM, Fast) && PrintMachineCode)
195 PM.add(createMachineFunctionPrinterPass(cerr));
197 addCodeEmitter(PM, Fast, MCE);
199 // Delete machine code for this function
200 PM.add(createMachineCodeDeleter());
202 return false; // success!