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 {
31 // ConstPoolId2AddrMap - A map from constant pool ids to the corresponding
32 // CONSTPOOL_ENTRY addresses.
33 SmallVector<intptr_t, 16> ConstPoolId2AddrMap;
35 // JumpTableId2AddrMap - A map from inline jumptable ids to the
36 // corresponding inline jump table bases.
37 SmallVector<intptr_t, 16> JumpTableId2AddrMap;
39 // PCLabelMap - A map from PC labels to addresses.
40 DenseMap<unsigned, intptr_t> PCLabelMap;
43 explicit ARMJITInfo(ARMTargetMachine &tm) : TM(tm) { useGOT = false; }
45 /// replaceMachineCodeForFunction - Make it so that calling the function
46 /// whose machine code is at OLD turns into a call to NEW, perhaps by
47 /// overwriting OLD with a branch to NEW. This is used for self-modifying
50 virtual void replaceMachineCodeForFunction(void *Old, void *New);
52 /// emitGlobalValueNonLazyPtr - Use the specified MachineCodeEmitter object
53 /// to emit a Mac OS X non-lazy pointer which contains the address of the
55 virtual void *emitGlobalValueNonLazyPtr(const GlobalValue *GV, void *Ptr,
56 MachineCodeEmitter &MCE);
58 /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
59 /// small native function that simply calls the function at the specified
61 virtual void *emitFunctionStub(const Function* F, void *Fn,
62 MachineCodeEmitter &MCE);
64 /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
65 virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
67 /// relocate - Before the JIT can run a block of code that has been emitted,
68 /// it must rewrite the code to contain the actual addresses of any
69 /// referenced global symbols.
70 virtual void relocate(void *Function, MachineRelocation *MR,
71 unsigned NumRelocs, unsigned char* GOTBase);
73 /// hasCustomConstantPool - Allows a target to specify that constant
74 /// pool address resolution is handled by the target.
75 virtual bool hasCustomConstantPool() const { return true; }
77 /// hasCustomJumpTables - Allows a target to specify that jumptables
78 /// are emitted by the target.
79 virtual bool hasCustomJumpTables() const { return true; }
81 /// allocateSeparateGVMemory - If true, globals should be placed in
82 /// separately allocated heap memory rather than in the same
83 /// code memory allocated by MachineCodeEmitter.
84 virtual bool allocateSeparateGVMemory() const {
92 /// Initialize - Initialize internal stage. Get the list of constant pool
93 /// Resize constant pool ids to CONSTPOOL_ENTRY addresses map.
94 void Initialize(const MachineFunction &MF) {
95 const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
96 ConstPoolId2AddrMap.resize(AFI->getNumConstPoolEntries());
97 JumpTableId2AddrMap.resize(AFI->getNumJumpTables());
100 /// getConstantPoolEntryAddr - The ARM target puts all constant
101 /// pool entries into constant islands. This returns the address of the
102 /// constant pool entry of the specified index.
103 intptr_t getConstantPoolEntryAddr(unsigned CPI) const {
104 assert(CPI < ConstPoolId2AddrMap.size());
105 return ConstPoolId2AddrMap[CPI];
108 /// addConstantPoolEntryAddr - Map a Constant Pool Index to the address
109 /// where its associated value is stored. When relocations are processed,
110 /// this value will be used to resolve references to the constant.
111 void addConstantPoolEntryAddr(unsigned CPI, intptr_t Addr) {
112 assert(CPI < ConstPoolId2AddrMap.size());
113 ConstPoolId2AddrMap[CPI] = Addr;
116 /// getJumpTableBaseAddr - The ARM target inline all jump tables within
117 /// text section of the function. This returns the address of the base of
118 /// the jump table of the specified index.
119 intptr_t getJumpTableBaseAddr(unsigned JTI) const {
120 assert(JTI < JumpTableId2AddrMap.size());
121 return JumpTableId2AddrMap[JTI];
124 /// addJumpTableBaseAddr - Map a jump table index to the address where
125 /// the corresponding inline jump table is emitted. When relocations are
126 /// processed, this value will be used to resolve references to the
128 void addJumpTableBaseAddr(unsigned JTI, intptr_t Addr) {
129 assert(JTI < JumpTableId2AddrMap.size());
130 JumpTableId2AddrMap[JTI] = Addr;
133 /// getPCLabelAddr - Retrieve the address of the PC label of the specified id.
134 intptr_t getPCLabelAddr(unsigned Id) const {
135 DenseMap<unsigned, intptr_t>::const_iterator I = PCLabelMap.find(Id);
136 assert(I != PCLabelMap.end());
140 /// addPCLabelAddr - Remember the address of the specified PC label.
141 void addPCLabelAddr(unsigned Id, intptr_t Addr) {
142 PCLabelMap.insert(std::make_pair(Id, Addr));
146 /// resolveRelocDestAddr - Resolve the resulting address of the relocation
147 /// if it's not already solved. Constantpool entries must be resolved by
149 intptr_t resolveRelocDestAddr(MachineRelocation *MR) const;