blob: b72704bd8051d33811e5d9f86c039aa90a05ef5a [file] [log] [blame]
Dan Gohmanf17a25c2007-07-18 16:29:46 +00001//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
2//
3// The LLVM Compiler Infrastructure
4//
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.
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/Target/TargetOptions.h"
21#include "llvm/Transforms/Scalar.h"
22#include "llvm/Support/CommandLine.h"
23using namespace llvm;
24
25static cl::opt<bool> PrintLSR("print-lsr-output", cl::Hidden,
26 cl::desc("Print LLVM IR produced by the loop-reduce pass"));
27static cl::opt<bool> PrintISelInput("print-isel-input", cl::Hidden,
28 cl::desc("Print LLVM IR input to isel pass"));
29
30FileModel::Model
31LLVMTargetMachine::addPassesToEmitFile(FunctionPassManager &PM,
32 std::ostream &Out,
33 CodeGenFileType FileType,
34 bool Fast) {
35 // Standard LLVM-Level Passes.
36
37 // Run loop strength reduction before anything else.
38 if (!Fast) {
39 PM.add(createLoopStrengthReducePass(getTargetLowering()));
40 if (PrintLSR)
41 PM.add(new PrintFunctionPass("\n\n*** Code after LSR *** \n", &cerr));
42 }
43
44 // FIXME: Implement efficient support for garbage collection intrinsics.
45 PM.add(createLowerGCPass());
46
47 if (!ExceptionHandling)
48 PM.add(createLowerInvokePass(getTargetLowering()));
49
50 // Make sure that no unreachable blocks are instruction selected.
51 PM.add(createUnreachableBlockEliminationPass());
52
53 if (!Fast)
54 PM.add(createCodeGenPreparePass(getTargetLowering()));
55
56 if (PrintISelInput)
57 PM.add(new PrintFunctionPass("\n\n*** Final LLVM Code input to ISel *** \n",
58 &cerr));
59
60 // Ask the target for an isel.
61 if (addInstSelector(PM, Fast))
62 return FileModel::Error;
63
64 // Print the instruction selected machine code...
65 if (PrintMachineCode)
66 PM.add(createMachineFunctionPrinterPass(cerr));
67
68 // Perform register allocation to convert to a concrete x86 representation
69 PM.add(createRegisterAllocator());
70
71 if (PrintMachineCode)
72 PM.add(createMachineFunctionPrinterPass(cerr));
73
74 // Run post-ra passes.
75 if (addPostRegAlloc(PM, Fast) && PrintMachineCode)
76 PM.add(createMachineFunctionPrinterPass(cerr));
77
78 // Insert prolog/epilog code. Eliminate abstract frame index references...
79 PM.add(createPrologEpilogCodeInserter());
80
81 // Second pass scheduler.
82 if (!Fast)
83 PM.add(createPostRAScheduler());
84
85 // Branch folding must be run after regalloc and prolog/epilog insertion.
86 if (!Fast)
87 PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
88
89 // Fold redundant debug labels.
90 PM.add(createDebugLabelFoldingPass());
91
92 if (PrintMachineCode) // Print the register-allocated code
93 PM.add(createMachineFunctionPrinterPass(cerr));
94
95 if (addPreEmitPass(PM, Fast) && PrintMachineCode)
96 PM.add(createMachineFunctionPrinterPass(cerr));
97
98 switch (FileType) {
99 default:
100 break;
101 case TargetMachine::AssemblyFile:
102 if (addAssemblyEmitter(PM, Fast, Out))
103 return FileModel::Error;
104 return FileModel::AsmFile;
105 case TargetMachine::ObjectFile:
106 if (getMachOWriterInfo())
107 return FileModel::MachOFile;
108 else if (getELFWriterInfo())
109 return FileModel::ElfFile;
110 }
111
112 return FileModel::Error;
113}
114
115/// addPassesToEmitFileFinish - If the passes to emit the specified file had to
116/// be split up (e.g., to add an object writer pass), this method can be used to
117/// finish up adding passes to emit the file, if necessary.
118bool LLVMTargetMachine::addPassesToEmitFileFinish(FunctionPassManager &PM,
119 MachineCodeEmitter *MCE,
120 bool Fast) {
121 if (MCE)
122 addSimpleCodeEmitter(PM, Fast, *MCE);
123
124 // Delete machine code for this function
125 PM.add(createMachineCodeDeleter());
126
127 return false; // success!
128}
129
130/// addPassesToEmitMachineCode - Add passes to the specified pass manager to
131/// get machine code emitted. This uses a MachineCodeEmitter object to handle
132/// actually outputting the machine code and resolving things like the address
133/// of functions. This method should returns true if machine code emission is
134/// not supported.
135///
136bool LLVMTargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
137 MachineCodeEmitter &MCE,
138 bool Fast) {
139 // Standard LLVM-Level Passes.
140
141 // Run loop strength reduction before anything else.
142 if (!Fast) {
143 PM.add(createLoopStrengthReducePass(getTargetLowering()));
144 if (PrintLSR)
145 PM.add(new PrintFunctionPass("\n\n*** Code after LSR *** \n", &cerr));
146 }
147
148 // FIXME: Implement efficient support for garbage collection intrinsics.
149 PM.add(createLowerGCPass());
150
151 // FIXME: Implement the invoke/unwind instructions!
152 PM.add(createLowerInvokePass(getTargetLowering()));
153
154 // Make sure that no unreachable blocks are instruction selected.
155 PM.add(createUnreachableBlockEliminationPass());
156
157 if (!Fast)
158 PM.add(createCodeGenPreparePass(getTargetLowering()));
159
160 if (PrintISelInput)
161 PM.add(new PrintFunctionPass("\n\n*** Final LLVM Code input to ISel *** \n",
162 &cerr));
163
164 // Ask the target for an isel.
165 if (addInstSelector(PM, Fast))
166 return true;
167
168 // Print the instruction selected machine code...
169 if (PrintMachineCode)
170 PM.add(createMachineFunctionPrinterPass(cerr));
171
172 // Perform register allocation to convert to a concrete x86 representation
173 PM.add(createRegisterAllocator());
174
175 if (PrintMachineCode)
176 PM.add(createMachineFunctionPrinterPass(cerr));
177
178 // Run post-ra passes.
179 if (addPostRegAlloc(PM, Fast) && PrintMachineCode)
180 PM.add(createMachineFunctionPrinterPass(cerr));
181
182 // Insert prolog/epilog code. Eliminate abstract frame index references...
183 PM.add(createPrologEpilogCodeInserter());
184
185 if (PrintMachineCode) // Print the register-allocated code
186 PM.add(createMachineFunctionPrinterPass(cerr));
187
188 // Second pass scheduler.
189 if (!Fast)
190 PM.add(createPostRAScheduler());
191
192 // Branch folding must be run after regalloc and prolog/epilog insertion.
193 if (!Fast)
194 PM.add(createBranchFoldingPass(getEnableTailMergeDefault()));
195
196 if (addPreEmitPass(PM, Fast) && PrintMachineCode)
197 PM.add(createMachineFunctionPrinterPass(cerr));
198
199 addCodeEmitter(PM, Fast, MCE);
200
201 // Delete machine code for this function
202 PM.add(createMachineCodeDeleter());
203
204 return false; // success!
205}