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Evan Cheng148b6a42007-07-05 21:15:40 +00001//===- ARMJITInfo.h - ARM implementation of the JIT interface --*- C++ -*-===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner4ee451d2007-12-29 20:36:04 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Evan Cheng148b6a42007-07-05 21:15:40 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file contains the declaration of the ARMJITInfo class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef ARMJITINFO_H
15#define ARMJITINFO_H
16
Evan Chengf1bbb952008-11-08 00:51:41 +000017#include "ARMMachineFunctionInfo.h"
Evan Cheng25e04782008-11-04 00:50:32 +000018#include "llvm/CodeGen/MachineConstantPool.h"
Evan Cheng4df60f52008-11-07 09:06:08 +000019#include "llvm/CodeGen/MachineFunction.h"
20#include "llvm/CodeGen/MachineJumpTableInfo.h"
Evan Chengf1bbb952008-11-08 00:51:41 +000021#include "llvm/Target/TargetJITInfo.h"
Evan Cheng25e04782008-11-04 00:50:32 +000022#include "llvm/ADT/DenseMap.h"
Evan Cheng938b9d82008-10-31 19:55:13 +000023#include "llvm/ADT/SmallVector.h"
Evan Cheng148b6a42007-07-05 21:15:40 +000024
25namespace llvm {
26 class ARMTargetMachine;
27
28 class ARMJITInfo : public TargetJITInfo {
Evan Cheng0f282432008-10-29 23:55:43 +000029 // ConstPoolId2AddrMap - A map from constant pool ids to the corresponding
30 // CONSTPOOL_ENTRY addresses.
Evan Cheng4df60f52008-11-07 09:06:08 +000031 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;
Evan Cheng0f282432008-10-29 23:55:43 +000036
Evan Cheng25e04782008-11-04 00:50:32 +000037 // PCLabelMap - A map from PC labels to addresses.
38 DenseMap<unsigned, intptr_t> PCLabelMap;
39
Evan Cheng3cc82232008-11-08 07:38:22 +000040 // IsPIC - True if the relocation model is PIC. This is used to determine
41 // how to codegen function stubs.
42 bool IsPIC;
43
Evan Cheng148b6a42007-07-05 21:15:40 +000044 public:
Evan Cheng3cc82232008-11-08 07:38:22 +000045 explicit ARMJITInfo() : IsPIC(false) { useGOT = false; }
Evan Cheng148b6a42007-07-05 21:15:40 +000046
47 /// replaceMachineCodeForFunction - Make it so that calling the function
48 /// whose machine code is at OLD turns into a call to NEW, perhaps by
49 /// overwriting OLD with a branch to NEW. This is used for self-modifying
50 /// code.
51 ///
52 virtual void replaceMachineCodeForFunction(void *Old, void *New);
53
Evan Chenge96a4902008-11-08 01:31:27 +000054 /// emitGlobalValueNonLazyPtr - Use the specified MachineCodeEmitter object
55 /// to emit a Mac OS X non-lazy pointer which contains the address of the
56 /// specified ptr.
57 virtual void *emitGlobalValueNonLazyPtr(const GlobalValue *GV, void *Ptr,
58 MachineCodeEmitter &MCE);
59
Evan Cheng148b6a42007-07-05 21:15:40 +000060 /// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
61 /// small native function that simply calls the function at the specified
62 /// address.
Nicolas Geoffray51cc3c12008-04-16 20:46:05 +000063 virtual void *emitFunctionStub(const Function* F, void *Fn,
64 MachineCodeEmitter &MCE);
Evan Cheng148b6a42007-07-05 21:15:40 +000065
66 /// getLazyResolverFunction - Expose the lazy resolver to the JIT.
67 virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
68
69 /// relocate - Before the JIT can run a block of code that has been emitted,
70 /// it must rewrite the code to contain the actual addresses of any
71 /// referenced global symbols.
72 virtual void relocate(void *Function, MachineRelocation *MR,
73 unsigned NumRelocs, unsigned char* GOTBase);
Evan Cheng25e04782008-11-04 00:50:32 +000074
Jim Grosbachbc6d8762008-10-28 18:25:49 +000075 /// hasCustomConstantPool - Allows a target to specify that constant
76 /// pool address resolution is handled by the target.
77 virtual bool hasCustomConstantPool() const { return true; }
78
Evan Cheng4df60f52008-11-07 09:06:08 +000079 /// hasCustomJumpTables - Allows a target to specify that jumptables
80 /// are emitted by the target.
81 virtual bool hasCustomJumpTables() const { return true; }
82
Evan Chengb0b53492008-11-04 09:30:48 +000083 /// allocateSeparateGVMemory - If true, globals should be placed in
84 /// separately allocated heap memory rather than in the same
85 /// code memory allocated by MachineCodeEmitter.
86 virtual bool allocateSeparateGVMemory() const {
87#ifdef __APPLE__
88 return true;
89#else
90 return false;
91#endif
92 }
93
Evan Cheng3cc82232008-11-08 07:38:22 +000094 /// Initialize - Initialize internal stage for the function being JITted.
95 /// Resize constant pool ids to CONSTPOOL_ENTRY addresses map; resize
96 /// jump table ids to jump table bases map; remember if codegen relocation
97 /// model is PIC.
98 void Initialize(const MachineFunction &MF, bool isPIC) {
Evan Chengf1bbb952008-11-08 00:51:41 +000099 const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
100 ConstPoolId2AddrMap.resize(AFI->getNumConstPoolEntries());
101 JumpTableId2AddrMap.resize(AFI->getNumJumpTables());
Evan Cheng3cc82232008-11-08 07:38:22 +0000102 IsPIC = isPIC;
Evan Cheng938b9d82008-10-31 19:55:13 +0000103 }
104
Evan Cheng0f282432008-10-29 23:55:43 +0000105 /// getConstantPoolEntryAddr - The ARM target puts all constant
Evan Cheng4df60f52008-11-07 09:06:08 +0000106 /// pool entries into constant islands. This returns the address of the
107 /// constant pool entry of the specified index.
Evan Cheng938b9d82008-10-31 19:55:13 +0000108 intptr_t getConstantPoolEntryAddr(unsigned CPI) const {
109 assert(CPI < ConstPoolId2AddrMap.size());
110 return ConstPoolId2AddrMap[CPI];
Evan Cheng0f282432008-10-29 23:55:43 +0000111 }
Jim Grosbachbc6d8762008-10-28 18:25:49 +0000112
Evan Cheng4df60f52008-11-07 09:06:08 +0000113 /// addConstantPoolEntryAddr - Map a Constant Pool Index to the address
Jim Grosbachbc6d8762008-10-28 18:25:49 +0000114 /// where its associated value is stored. When relocations are processed,
115 /// this value will be used to resolve references to the constant.
Evan Cheng938b9d82008-10-31 19:55:13 +0000116 void addConstantPoolEntryAddr(unsigned CPI, intptr_t Addr) {
117 assert(CPI < ConstPoolId2AddrMap.size());
118 ConstPoolId2AddrMap[CPI] = Addr;
Evan Cheng0f282432008-10-29 23:55:43 +0000119 }
Evan Cheng25e04782008-11-04 00:50:32 +0000120
Evan Cheng4df60f52008-11-07 09:06:08 +0000121 /// getJumpTableBaseAddr - The ARM target inline all jump tables within
122 /// text section of the function. This returns the address of the base of
123 /// the jump table of the specified index.
124 intptr_t getJumpTableBaseAddr(unsigned JTI) const {
125 assert(JTI < JumpTableId2AddrMap.size());
126 return JumpTableId2AddrMap[JTI];
127 }
128
129 /// addJumpTableBaseAddr - Map a jump table index to the address where
130 /// the corresponding inline jump table is emitted. When relocations are
131 /// processed, this value will be used to resolve references to the
132 /// jump table.
133 void addJumpTableBaseAddr(unsigned JTI, intptr_t Addr) {
134 assert(JTI < JumpTableId2AddrMap.size());
135 JumpTableId2AddrMap[JTI] = Addr;
136 }
137
Evan Cheng25e04782008-11-04 00:50:32 +0000138 /// getPCLabelAddr - Retrieve the address of the PC label of the specified id.
139 intptr_t getPCLabelAddr(unsigned Id) const {
140 DenseMap<unsigned, intptr_t>::const_iterator I = PCLabelMap.find(Id);
141 assert(I != PCLabelMap.end());
142 return I->second;
143 }
144
145 /// addPCLabelAddr - Remember the address of the specified PC label.
146 void addPCLabelAddr(unsigned Id, intptr_t Addr) {
147 PCLabelMap.insert(std::make_pair(Id, Addr));
148 }
149
150 private:
Evan Cheng4df60f52008-11-07 09:06:08 +0000151 /// resolveRelocDestAddr - Resolve the resulting address of the relocation
Evan Cheng25e04782008-11-04 00:50:32 +0000152 /// if it's not already solved. Constantpool entries must be resolved by
153 /// ARM target.
Evan Cheng4df60f52008-11-07 09:06:08 +0000154 intptr_t resolveRelocDestAddr(MachineRelocation *MR) const;
Evan Cheng148b6a42007-07-05 21:15:40 +0000155 };
156}
157
158#endif