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 /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
53 /// small native function that simply calls the function at the specified
55 virtual void *emitFunctionStub(const Function* F, void *Fn,
56 MachineCodeEmitter &MCE);
58 /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
59 virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
61 /// relocate - Before the JIT can run a block of code that has been emitted,
62 /// it must rewrite the code to contain the actual addresses of any
63 /// referenced global symbols.
64 virtual void relocate(void *Function, MachineRelocation *MR,
65 unsigned NumRelocs, unsigned char* GOTBase);
67 /// hasCustomConstantPool - Allows a target to specify that constant
68 /// pool address resolution is handled by the target.
69 virtual bool hasCustomConstantPool() const { return true; }
71 /// hasCustomJumpTables - Allows a target to specify that jumptables
72 /// are emitted by the target.
73 virtual bool hasCustomJumpTables() const { return true; }
75 /// allocateSeparateGVMemory - If true, globals should be placed in
76 /// separately allocated heap memory rather than in the same
77 /// code memory allocated by MachineCodeEmitter.
78 virtual bool allocateSeparateGVMemory() const {
86 /// Initialize - Initialize internal stage. Get the list of constant pool
87 /// Resize constant pool ids to CONSTPOOL_ENTRY addresses map.
88 void Initialize(const MachineFunction &MF) {
89 const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
90 ConstPoolId2AddrMap.resize(AFI->getNumConstPoolEntries());
91 JumpTableId2AddrMap.resize(AFI->getNumJumpTables());
94 /// getConstantPoolEntryAddr - The ARM target puts all constant
95 /// pool entries into constant islands. This returns the address of the
96 /// constant pool entry of the specified index.
97 intptr_t getConstantPoolEntryAddr(unsigned CPI) const {
98 assert(CPI < ConstPoolId2AddrMap.size());
99 return ConstPoolId2AddrMap[CPI];
102 /// addConstantPoolEntryAddr - Map a Constant Pool Index to the address
103 /// where its associated value is stored. When relocations are processed,
104 /// this value will be used to resolve references to the constant.
105 void addConstantPoolEntryAddr(unsigned CPI, intptr_t Addr) {
106 assert(CPI < ConstPoolId2AddrMap.size());
107 ConstPoolId2AddrMap[CPI] = Addr;
110 /// getJumpTableBaseAddr - The ARM target inline all jump tables within
111 /// text section of the function. This returns the address of the base of
112 /// the jump table of the specified index.
113 intptr_t getJumpTableBaseAddr(unsigned JTI) const {
114 assert(JTI < JumpTableId2AddrMap.size());
115 return JumpTableId2AddrMap[JTI];
118 /// addJumpTableBaseAddr - Map a jump table index to the address where
119 /// the corresponding inline jump table is emitted. When relocations are
120 /// processed, this value will be used to resolve references to the
122 void addJumpTableBaseAddr(unsigned JTI, intptr_t Addr) {
123 assert(JTI < JumpTableId2AddrMap.size());
124 JumpTableId2AddrMap[JTI] = Addr;
127 /// getPCLabelAddr - Retrieve the address of the PC label of the specified id.
128 intptr_t getPCLabelAddr(unsigned Id) const {
129 DenseMap<unsigned, intptr_t>::const_iterator I = PCLabelMap.find(Id);
130 assert(I != PCLabelMap.end());
134 /// addPCLabelAddr - Remember the address of the specified PC label.
135 void addPCLabelAddr(unsigned Id, intptr_t Addr) {
136 PCLabelMap.insert(std::make_pair(Id, Addr));
140 /// resolveRelocDestAddr - Resolve the resulting address of the relocation
141 /// if it's not already solved. Constantpool entries must be resolved by
143 intptr_t resolveRelocDestAddr(MachineRelocation *MR) const;