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ARMJITInfo.h
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1 //===-- ARMJITInfo.h - ARM implementation of the JIT interface -*- C++ -*-===//
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 contains the declaration of the ARMJITInfo class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef ARMJITINFO_H
15 #define ARMJITINFO_H
16 
17 #include "ARMMachineFunctionInfo.h"
18 #include "llvm/ADT/DenseMap.h"
19 #include "llvm/ADT/SmallVector.h"
24 
25 namespace llvm {
26  class ARMTargetMachine;
27 
28  class ARMJITInfo : public TargetJITInfo {
29  // ConstPoolId2AddrMap - A map from constant pool ids to the corresponding
30  // CONSTPOOL_ENTRY addresses.
31  SmallVector<intptr_t, 16> ConstPoolId2AddrMap;
32 
33  // JumpTableId2AddrMap - A map from inline jumptable ids to the
34  // corresponding inline jump table bases.
35  SmallVector<intptr_t, 16> JumpTableId2AddrMap;
36 
37  // PCLabelMap - A map from PC labels to addresses.
39 
40  // Sym2IndirectSymMap - A map from symbol (GlobalValue and ExternalSymbol)
41  // addresses to their indirect symbol addresses.
42  DenseMap<void*, intptr_t> Sym2IndirectSymMap;
43 
44  // IsPIC - True if the relocation model is PIC. This is used to determine
45  // how to codegen function stubs.
46  bool IsPIC;
47 
48  public:
49  explicit ARMJITInfo() : IsPIC(false) { useGOT = false; }
50 
51  /// replaceMachineCodeForFunction - Make it so that calling the function
52  /// whose machine code is at OLD turns into a call to NEW, perhaps by
53  /// overwriting OLD with a branch to NEW. This is used for self-modifying
54  /// code.
55  ///
56  virtual void replaceMachineCodeForFunction(void *Old, void *New);
57 
58  /// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
59  /// to emit an indirect symbol which contains the address of the specified
60  /// ptr.
61  virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
62  JITCodeEmitter &JCE);
63 
64  // getStubLayout - Returns the size and alignment of the largest call stub
65  // on ARM.
66  virtual StubLayout getStubLayout();
67 
68  /// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
69  /// small native function that simply calls the function at the specified
70  /// address.
71  virtual void *emitFunctionStub(const Function* F, void *Fn,
72  JITCodeEmitter &JCE);
73 
74  /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
76 
77  /// relocate - Before the JIT can run a block of code that has been emitted,
78  /// it must rewrite the code to contain the actual addresses of any
79  /// referenced global symbols.
80  virtual void relocate(void *Function, MachineRelocation *MR,
81  unsigned NumRelocs, unsigned char* GOTBase);
82 
83  /// hasCustomConstantPool - Allows a target to specify that constant
84  /// pool address resolution is handled by the target.
85  virtual bool hasCustomConstantPool() const { return true; }
86 
87  /// hasCustomJumpTables - Allows a target to specify that jumptables
88  /// are emitted by the target.
89  virtual bool hasCustomJumpTables() const { return true; }
90 
91  /// allocateSeparateGVMemory - If true, globals should be placed in
92  /// separately allocated heap memory rather than in the same
93  /// code memory allocated by JITCodeEmitter.
94  virtual bool allocateSeparateGVMemory() const {
95 #ifdef __APPLE__
96  return true;
97 #else
98  return false;
99 #endif
100  }
101 
102  /// Initialize - Initialize internal stage for the function being JITted.
103  /// Resize constant pool ids to CONSTPOOL_ENTRY addresses map; resize
104  /// jump table ids to jump table bases map; remember if codegen relocation
105  /// model is PIC.
106  void Initialize(const MachineFunction &MF, bool isPIC) {
107  const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
108  ConstPoolId2AddrMap.resize(AFI->getNumPICLabels());
109  JumpTableId2AddrMap.resize(AFI->getNumJumpTables());
110  IsPIC = isPIC;
111  }
112 
113  /// getConstantPoolEntryAddr - The ARM target puts all constant
114  /// pool entries into constant islands. This returns the address of the
115  /// constant pool entry of the specified index.
116  intptr_t getConstantPoolEntryAddr(unsigned CPI) const {
117  assert(CPI < ConstPoolId2AddrMap.size());
118  return ConstPoolId2AddrMap[CPI];
119  }
120 
121  /// addConstantPoolEntryAddr - Map a Constant Pool Index to the address
122  /// where its associated value is stored. When relocations are processed,
123  /// this value will be used to resolve references to the constant.
124  void addConstantPoolEntryAddr(unsigned CPI, intptr_t Addr) {
125  assert(CPI < ConstPoolId2AddrMap.size());
126  ConstPoolId2AddrMap[CPI] = Addr;
127  }
128 
129  /// getJumpTableBaseAddr - The ARM target inline all jump tables within
130  /// text section of the function. This returns the address of the base of
131  /// the jump table of the specified index.
132  intptr_t getJumpTableBaseAddr(unsigned JTI) const {
133  assert(JTI < JumpTableId2AddrMap.size());
134  return JumpTableId2AddrMap[JTI];
135  }
136 
137  /// addJumpTableBaseAddr - Map a jump table index to the address where
138  /// the corresponding inline jump table is emitted. When relocations are
139  /// processed, this value will be used to resolve references to the
140  /// jump table.
141  void addJumpTableBaseAddr(unsigned JTI, intptr_t Addr) {
142  assert(JTI < JumpTableId2AddrMap.size());
143  JumpTableId2AddrMap[JTI] = Addr;
144  }
145 
146  /// getPCLabelAddr - Retrieve the address of the PC label of the
147  /// specified id.
148  intptr_t getPCLabelAddr(unsigned Id) const {
150  assert(I != PCLabelMap.end());
151  return I->second;
152  }
153 
154  /// addPCLabelAddr - Remember the address of the specified PC label.
155  void addPCLabelAddr(unsigned Id, intptr_t Addr) {
156  PCLabelMap.insert(std::make_pair(Id, Addr));
157  }
158 
159  /// getIndirectSymAddr - Retrieve the address of the indirect symbol of the
160  /// specified symbol located at address. Returns 0 if the indirect symbol
161  /// has not been emitted.
162  intptr_t getIndirectSymAddr(void *Addr) const {
163  DenseMap<void*,intptr_t>::const_iterator I= Sym2IndirectSymMap.find(Addr);
164  if (I != Sym2IndirectSymMap.end())
165  return I->second;
166  return 0;
167  }
168 
169  /// addIndirectSymAddr - Add a mapping from address of an emitted symbol to
170  /// its indirect symbol address.
171  void addIndirectSymAddr(void *SymAddr, intptr_t IndSymAddr) {
172  Sym2IndirectSymMap.insert(std::make_pair(SymAddr, IndSymAddr));
173  }
174 
175  private:
176  /// resolveRelocDestAddr - Resolve the resulting address of the relocation
177  /// if it's not already solved. Constantpool entries must be resolved by
178  /// ARM target.
179  intptr_t resolveRelocDestAddr(MachineRelocation *MR) const;
180  };
181 }
182 
183 #endif
virtual void replaceMachineCodeForFunction(void *Old, void *New)
Definition: ARMJITInfo.cpp:29
void addJumpTableBaseAddr(unsigned JTI, intptr_t Addr)
Definition: ARMJITInfo.h:141
F(f)
virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn)
getLazyResolverFunction - Expose the lazy resolver to the JIT.
Definition: ARMJITInfo.cpp:136
void *(* JITCompilerFn)(void *)
Definition: TargetJITInfo.h:90
intptr_t getConstantPoolEntryAddr(unsigned CPI) const
Definition: ARMJITInfo.h:116
#define false
Definition: ConvertUTF.c:64
void(* LazyResolverFn)()
Definition: TargetJITInfo.h:83
intptr_t getJumpTableBaseAddr(unsigned JTI) const
Definition: ARMJITInfo.h:132
void addIndirectSymAddr(void *SymAddr, intptr_t IndSymAddr)
Definition: ARMJITInfo.h:171
unsigned getNumPICLabels() const
virtual void * emitGlobalValueIndirectSym(const GlobalValue *GV, void *ptr, JITCodeEmitter &JCE)
Definition: ARMJITInfo.cpp:141
iterator end()
Definition: DenseMap.h:57
void Initialize(const MachineFunction &MF, bool isPIC)
Definition: ARMJITInfo.h:106
virtual void * emitFunctionStub(const Function *F, void *Fn, JITCodeEmitter &JCE)
Definition: ARMJITInfo.cpp:159
void addConstantPoolEntryAddr(unsigned CPI, intptr_t Addr)
Definition: ARMJITInfo.h:124
std::pair< iterator, bool > insert(const std::pair< KeyT, ValueT > &KV)
Definition: DenseMap.h:153
virtual StubLayout getStubLayout()
Returns the maximum size and alignment for a call stub on this target.
Definition: ARMJITInfo.cpp:152
virtual bool allocateSeparateGVMemory() const
Definition: ARMJITInfo.h:94
virtual bool hasCustomConstantPool() const
Definition: ARMJITInfo.h:85
void addPCLabelAddr(unsigned Id, intptr_t Addr)
addPCLabelAddr - Remember the address of the specified PC label.
Definition: ARMJITInfo.h:155
virtual bool hasCustomJumpTables() const
Definition: ARMJITInfo.h:89
#define I(x, y, z)
Definition: MD5.cpp:54
void resize(unsigned N)
Definition: SmallVector.h:401
virtual void relocate(void *Function, MachineRelocation *MR, unsigned NumRelocs, unsigned char *GOTBase)
Definition: ARMJITInfo.cpp:267
unsigned getNumJumpTables() const
intptr_t getIndirectSymAddr(void *Addr) const
Definition: ARMJITInfo.h:162
intptr_t getPCLabelAddr(unsigned Id) const
Definition: ARMJITInfo.h:148
iterator find(const KeyT &Val)
Definition: DenseMap.h:108