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 "llvm/Target/TargetJITInfo.h"
18 #include "llvm/CodeGen/MachineConstantPool.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineJumpTableInfo.h"
21 #include "llvm/ADT/DenseMap.h"
22 #include "llvm/ADT/SmallVector.h"
25 class ARMTargetMachine;
27 class ARMJITInfo : public TargetJITInfo {
30 // MCPEs - List of the constant pool entries for the current machine
31 // function that's being processed.
32 const std::vector<MachineConstantPoolEntry> *MCPEs;
34 // ConstPoolId2AddrMap - A map from constant pool ids to the corresponding
35 // CONSTPOOL_ENTRY addresses.
36 SmallVector<intptr_t, 16> ConstPoolId2AddrMap;
38 // JumpTableId2AddrMap - A map from inline jumptable ids to the
39 // corresponding inline jump table bases.
40 SmallVector<intptr_t, 16> JumpTableId2AddrMap;
42 // PCLabelMap - A map from PC labels to addresses.
43 DenseMap<unsigned, intptr_t> PCLabelMap;
46 explicit ARMJITInfo(ARMTargetMachine &tm) : TM(tm) { useGOT = false; }
48 /// replaceMachineCodeForFunction - Make it so that calling the function
49 /// whose machine code is at OLD turns into a call to NEW, perhaps by
50 /// overwriting OLD with a branch to NEW. This is used for self-modifying
53 virtual void replaceMachineCodeForFunction(void *Old, void *New);
55 /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
56 /// small native function that simply calls the function at the specified
58 virtual void *emitFunctionStub(const Function* F, void *Fn,
59 MachineCodeEmitter &MCE);
61 /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
62 virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
64 /// relocate - Before the JIT can run a block of code that has been emitted,
65 /// it must rewrite the code to contain the actual addresses of any
66 /// referenced global symbols.
67 virtual void relocate(void *Function, MachineRelocation *MR,
68 unsigned NumRelocs, unsigned char* GOTBase);
70 /// hasCustomConstantPool - Allows a target to specify that constant
71 /// pool address resolution is handled by the target.
72 virtual bool hasCustomConstantPool() const { return true; }
74 /// hasCustomJumpTables - Allows a target to specify that jumptables
75 /// are emitted by the target.
76 virtual bool hasCustomJumpTables() const { return true; }
78 /// allocateSeparateGVMemory - If true, globals should be placed in
79 /// separately allocated heap memory rather than in the same
80 /// code memory allocated by MachineCodeEmitter.
81 virtual bool allocateSeparateGVMemory() const {
89 /// Initialize - Initialize internal stage. Get the list of constant pool
90 /// Resize constant pool ids to CONSTPOOL_ENTRY addresses map.
91 void Initialize(const MachineFunction &MF) {
92 MCPEs = &MF.getConstantPool()->getConstants();
93 ConstPoolId2AddrMap.resize(MCPEs->size());
94 JumpTableId2AddrMap.resize(MF.getJumpTableInfo()->getJumpTables().size());
97 /// getConstantPoolEntryAddr - The ARM target puts all constant
98 /// pool entries into constant islands. This returns the address of the
99 /// constant pool entry of the specified index.
100 intptr_t getConstantPoolEntryAddr(unsigned CPI) const {
101 assert(CPI < ConstPoolId2AddrMap.size());
102 return ConstPoolId2AddrMap[CPI];
105 /// addConstantPoolEntryAddr - Map a Constant Pool Index to the address
106 /// where its associated value is stored. When relocations are processed,
107 /// this value will be used to resolve references to the constant.
108 void addConstantPoolEntryAddr(unsigned CPI, intptr_t Addr) {
109 assert(CPI < ConstPoolId2AddrMap.size());
110 ConstPoolId2AddrMap[CPI] = Addr;
113 /// getJumpTableBaseAddr - The ARM target inline all jump tables within
114 /// text section of the function. This returns the address of the base of
115 /// the jump table of the specified index.
116 intptr_t getJumpTableBaseAddr(unsigned JTI) const {
117 assert(JTI < JumpTableId2AddrMap.size());
118 return JumpTableId2AddrMap[JTI];
121 /// addJumpTableBaseAddr - Map a jump table index to the address where
122 /// the corresponding inline jump table is emitted. When relocations are
123 /// processed, this value will be used to resolve references to the
125 void addJumpTableBaseAddr(unsigned JTI, intptr_t Addr) {
126 assert(JTI < JumpTableId2AddrMap.size());
127 JumpTableId2AddrMap[JTI] = Addr;
130 /// getPCLabelAddr - Retrieve the address of the PC label of the specified id.
131 intptr_t getPCLabelAddr(unsigned Id) const {
132 DenseMap<unsigned, intptr_t>::const_iterator I = PCLabelMap.find(Id);
133 assert(I != PCLabelMap.end());
137 /// addPCLabelAddr - Remember the address of the specified PC label.
138 void addPCLabelAddr(unsigned Id, intptr_t Addr) {
139 PCLabelMap.insert(std::make_pair(Id, Addr));
143 /// resolveRelocDestAddr - Resolve the resulting address of the relocation
144 /// if it's not already solved. Constantpool entries must be resolved by
146 intptr_t resolveRelocDestAddr(MachineRelocation *MR) const;