1 //===- ARMJITInfo.h - ARM implementation of the JIT interface --*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the declaration of the ARMJITInfo class.
12 //===----------------------------------------------------------------------===//
17 #include "ARMMachineFunctionInfo.h"
18 #include "llvm/CodeGen/MachineConstantPool.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineJumpTableInfo.h"
21 #include "llvm/Target/TargetJITInfo.h"
22 #include "llvm/ADT/DenseMap.h"
23 #include "llvm/ADT/SmallVector.h"
26 class ARMTargetMachine;
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;
33 // JumpTableId2AddrMap - A map from inline jumptable ids to the
34 // corresponding inline jump table bases.
35 SmallVector<intptr_t, 16> JumpTableId2AddrMap;
37 // PCLabelMap - A map from PC labels to addresses.
38 DenseMap<unsigned, intptr_t> PCLabelMap;
40 // Sym2IndirectSymMap - A map from symbol (GlobalValue and ExternalSymbol)
41 // addresses to their indirect symbol addresses.
42 DenseMap<void*, intptr_t> Sym2IndirectSymMap;
44 // IsPIC - True if the relocation model is PIC. This is used to determine
45 // how to codegen function stubs.
49 explicit ARMJITInfo() : IsPIC(false) { useGOT = false; }
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
56 virtual void replaceMachineCodeForFunction(void *Old, void *New);
58 /// emitGlobalValueIndirectSym - Use the specified MachineCodeEmitter object
59 /// to emit an indirect symbol which contains the address of the specified
61 virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
62 MachineCodeEmitter &MCE);
64 /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
65 /// small native function that simply calls the function at the specified
67 virtual void *emitFunctionStub(const Function* F, void *Fn,
68 MachineCodeEmitter &MCE);
70 /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
71 virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
73 /// relocate - Before the JIT can run a block of code that has been emitted,
74 /// it must rewrite the code to contain the actual addresses of any
75 /// referenced global symbols.
76 virtual void relocate(void *Function, MachineRelocation *MR,
77 unsigned NumRelocs, unsigned char* GOTBase);
79 /// hasCustomConstantPool - Allows a target to specify that constant
80 /// pool address resolution is handled by the target.
81 virtual bool hasCustomConstantPool() const { return true; }
83 /// hasCustomJumpTables - Allows a target to specify that jumptables
84 /// are emitted by the target.
85 virtual bool hasCustomJumpTables() const { return true; }
87 /// allocateSeparateGVMemory - If true, globals should be placed in
88 /// separately allocated heap memory rather than in the same
89 /// code memory allocated by MachineCodeEmitter.
90 virtual bool allocateSeparateGVMemory() const {
98 /// Initialize - Initialize internal stage for the function being JITted.
99 /// Resize constant pool ids to CONSTPOOL_ENTRY addresses map; resize
100 /// jump table ids to jump table bases map; remember if codegen relocation
102 void Initialize(const MachineFunction &MF, bool isPIC) {
103 const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
104 ConstPoolId2AddrMap.resize(AFI->getNumConstPoolEntries());
105 JumpTableId2AddrMap.resize(AFI->getNumJumpTables());
109 /// getConstantPoolEntryAddr - The ARM target puts all constant
110 /// pool entries into constant islands. This returns the address of the
111 /// constant pool entry of the specified index.
112 intptr_t getConstantPoolEntryAddr(unsigned CPI) const {
113 assert(CPI < ConstPoolId2AddrMap.size());
114 return ConstPoolId2AddrMap[CPI];
117 /// addConstantPoolEntryAddr - Map a Constant Pool Index to the address
118 /// where its associated value is stored. When relocations are processed,
119 /// this value will be used to resolve references to the constant.
120 void addConstantPoolEntryAddr(unsigned CPI, intptr_t Addr) {
121 assert(CPI < ConstPoolId2AddrMap.size());
122 ConstPoolId2AddrMap[CPI] = Addr;
125 /// getJumpTableBaseAddr - The ARM target inline all jump tables within
126 /// text section of the function. This returns the address of the base of
127 /// the jump table of the specified index.
128 intptr_t getJumpTableBaseAddr(unsigned JTI) const {
129 assert(JTI < JumpTableId2AddrMap.size());
130 return JumpTableId2AddrMap[JTI];
133 /// addJumpTableBaseAddr - Map a jump table index to the address where
134 /// the corresponding inline jump table is emitted. When relocations are
135 /// processed, this value will be used to resolve references to the
137 void addJumpTableBaseAddr(unsigned JTI, intptr_t Addr) {
138 assert(JTI < JumpTableId2AddrMap.size());
139 JumpTableId2AddrMap[JTI] = Addr;
142 /// getPCLabelAddr - Retrieve the address of the PC label of the specified id.
143 intptr_t getPCLabelAddr(unsigned Id) const {
144 DenseMap<unsigned, intptr_t>::const_iterator I = PCLabelMap.find(Id);
145 assert(I != PCLabelMap.end());
149 /// addPCLabelAddr - Remember the address of the specified PC label.
150 void addPCLabelAddr(unsigned Id, intptr_t Addr) {
151 PCLabelMap.insert(std::make_pair(Id, Addr));
154 /// getIndirectSymAddr - Retrieve the address of the indirect symbol of the
155 /// specified symbol located at address. Returns 0 if the indirect symbol
156 /// has not been emitted.
157 intptr_t getIndirectSymAddr(void *Addr) const {
158 DenseMap<void*,intptr_t>::const_iterator I= Sym2IndirectSymMap.find(Addr);
159 if (I != Sym2IndirectSymMap.end())
164 /// addIndirectSymAddr - Add a mapping from address of an emitted symbol to
165 /// its indirect symbol address.
166 void addIndirectSymAddr(void *SymAddr, intptr_t IndSymAddr) {
167 Sym2IndirectSymMap.insert(std::make_pair(SymAddr, IndSymAddr));
171 /// resolveRelocDestAddr - Resolve the resulting address of the relocation
172 /// if it's not already solved. Constantpool entries must be resolved by
174 intptr_t resolveRelocDestAddr(MachineRelocation *MR) const;