JIT.cpp revision df5a37efc997288da520ff4889443e3560d95387
14d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===// 2b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 5b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// This file was developed by the LLVM research group and is distributed under 6b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// the University of Illinois Open Source License. See LICENSE.TXT for details. 7b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 9bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner// 104d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner// This tool implements a just-in-time compiler for LLVM, allowing direct 114d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner// execution of LLVM bytecode in an efficient manner. 12bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner// 13bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner//===----------------------------------------------------------------------===// 14bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner 154d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner#include "JIT.h" 16cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner#include "llvm/Constants.h" 17c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner#include "llvm/DerivedTypes.h" 184d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner#include "llvm/Function.h" 19c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner#include "llvm/GlobalVariable.h" 20cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner#include "llvm/Instructions.h" 210f4f7d9eb72dec2a72ec596fb3d611a241893bb7Misha Brukman#include "llvm/ModuleProvider.h" 224d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner#include "llvm/CodeGen/MachineCodeEmitter.h" 234d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner#include "llvm/CodeGen/MachineFunction.h" 249722294d30fff2a432d8e171eb904f33956353e2Brian Gaeke#include "llvm/ExecutionEngine/GenericValue.h" 25df5a37efc997288da520ff4889443e3560d95387Reid Spencer#include "llvm/System/DynamicLibrary.h" 26bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner#include "llvm/Target/TargetMachine.h" 274d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner#include "llvm/Target/TargetJITInfo.h" 28954da37bb492b519f5c31dc360f2a142567e08b4Reid Spencer#include <iostream> 29954da37bb492b519f5c31dc360f2a142567e08b4Reid Spencer 30c19aadee66b744311afe6e420847e80822a765f2Chris Lattnerusing namespace llvm; 31abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman 324d326fa9bea5b80147edf14d1521fc41ce315275Chris LattnerJIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji) 331e60a9165dc4d6ce5650dacc026f2942696af920Chris Lattner : ExecutionEngine(MP), TM(tm), TJI(tji), PM(MP) { 34bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner setTargetData(TM.getTargetData()); 35abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman 36abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman // Initialize MCE 37906f5fa5c8bb790201c79a33ea6d906f9f57f827Misha Brukman MCE = createEmitter(*this); 381e60a9165dc4d6ce5650dacc026f2942696af920Chris Lattner 3950872d5385463cf1d2e23a758516e7f818e1af24Brian Gaeke // Add target data 40cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner PM.add(new TargetData(TM.getTargetData())); 4150872d5385463cf1d2e23a758516e7f818e1af24Brian Gaeke 424d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Compile LLVM Code down to machine code in the intermediate representation 434d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner TJI.addPassesToJITCompile(PM); 444d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 454d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Turn the machine code intermediate representation into bytes in memory that 464d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // may be executed. 474d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner if (TM.addPassesToEmitMachineCode(PM, *MCE)) { 48cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner std::cerr << "Target '" << TM.getName() 494d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner << "' doesn't support machine code emission!\n"; 504d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner abort(); 514d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner } 52bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner} 53bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner 544d326fa9bea5b80147edf14d1521fc41ce315275Chris LattnerJIT::~JIT() { 554d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner delete MCE; 564d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner delete &TM; 574d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 584d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 5970975eef572b9e132bbaade16ba9edb76f15f287Brian Gaeke/// run - Start execution with the specified function and arguments. 6005a1a306bcfba2b533dc1210d24924e5f3e9ed0eChris Lattner/// 61ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris LattnerGenericValue JIT::runFunction(Function *F, 62ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris Lattner const std::vector<GenericValue> &ArgValues) { 63b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner assert(F && "Function *F was null at entry to run()"); 64b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner 65b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner void *FPtr = getPointerToFunction(F); 667c45d7898bdfdc29a61a58b678e13ed41333ed51Chris Lattner assert(FPtr && "Pointer to fn's code was null after getPointerToFunction"); 67f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner const FunctionType *FTy = F->getFunctionType(); 68e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner const Type *RetTy = FTy->getReturnType(); 69bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner 70e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner assert((FTy->getNumParams() <= ArgValues.size() || FTy->isVarArg()) && 71e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner "Too many arguments passed into function!"); 72e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner assert(FTy->getNumParams() == ArgValues.size() && 73e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner "This doesn't support passing arguments through varargs (yet)!"); 74e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner 75ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman // Handle some common cases first. These cases correspond to common `main' 76e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner // prototypes. 77d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner if (RetTy == Type::IntTy || RetTy == Type::UIntTy || RetTy == Type::VoidTy) { 78f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner switch (ArgValues.size()) { 79f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner case 3: 80174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner if ((FTy->getParamType(0) == Type::IntTy || 81f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner FTy->getParamType(0) == Type::UIntTy) && 82f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner isa<PointerType>(FTy->getParamType(1)) && 83f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner isa<PointerType>(FTy->getParamType(2))) { 84f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner int (*PF)(int, char **, const char **) = 85f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner (int(*)(int, char **, const char **))FPtr; 86ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman 87f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner // Call the function. 88e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 89f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner rv.IntVal = PF(ArgValues[0].IntVal, (char **)GVTOP(ArgValues[1]), 90f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner (const char **)GVTOP(ArgValues[2])); 91f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner return rv; 92f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner } 93f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner break; 94174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner case 2: 95174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner if ((FTy->getParamType(0) == Type::IntTy || 96174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner FTy->getParamType(0) == Type::UIntTy) && 97174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner isa<PointerType>(FTy->getParamType(1))) { 98174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner int (*PF)(int, char **) = (int(*)(int, char **))FPtr; 99ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman 100174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner // Call the function. 101174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner GenericValue rv; 102174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner rv.IntVal = PF(ArgValues[0].IntVal, (char **)GVTOP(ArgValues[1])); 103174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner return rv; 104174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner } 105174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner break; 106f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner case 1: 107f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner if (FTy->getNumParams() == 1 && 108f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner (FTy->getParamType(0) == Type::IntTy || 109f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner FTy->getParamType(0) == Type::UIntTy)) { 110e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 111f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner int (*PF)(int) = (int(*)(int))FPtr; 112f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner rv.IntVal = PF(ArgValues[0].IntVal); 113f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner return rv; 114f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner } 115f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner break; 116e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner } 117e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner } 118e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner 119e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner // Handle cases where no arguments are passed first. 120e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner if (ArgValues.empty()) { 121e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 122e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner switch (RetTy->getTypeID()) { 123e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner default: assert(0 && "Unknown return type for function call!"); 124e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::BoolTyID: 125e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.BoolVal = ((bool(*)())FPtr)(); 126e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 127e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::SByteTyID: 128e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UByteTyID: 129e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.SByteVal = ((char(*)())FPtr)(); 130e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 131e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::ShortTyID: 132e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UShortTyID: 133e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.ShortVal = ((short(*)())FPtr)(); 134e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 135e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::VoidTyID: 136e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::IntTyID: 137e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UIntTyID: 138e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.IntVal = ((int(*)())FPtr)(); 139e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 140e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::LongTyID: 141e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::ULongTyID: 142e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.LongVal = ((int64_t(*)())FPtr)(); 143e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 144e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::FloatTyID: 145e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.FloatVal = ((float(*)())FPtr)(); 146e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 147e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::DoubleTyID: 148e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.DoubleVal = ((double(*)())FPtr)(); 149d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner return rv; 150e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::PointerTyID: 151e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return PTOGV(((void*(*)())FPtr)()); 152d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner } 153ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris Lattner } 15470975eef572b9e132bbaade16ba9edb76f15f287Brian Gaeke 155cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Okay, this is not one of our quick and easy cases. Because we don't have a 156cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // full FFI, we have to codegen a nullary stub function that just calls the 157cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // function we are interested in, passing in constants for all of the 158cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // arguments. Make this function and return. 159cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 160cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // First, create the function. 161cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner FunctionType *STy=FunctionType::get(RetTy, std::vector<const Type*>(), false); 162cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Function *Stub = new Function(STy, Function::InternalLinkage, "", 163cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner F->getParent()); 164cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 165cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Insert a basic block. 166cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner BasicBlock *StubBB = new BasicBlock("", Stub); 167cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 168cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Convert all of the GenericValue arguments over to constants. Note that we 169cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // currently don't support varargs. 170cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner std::vector<Value*> Args; 171cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) { 172cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Constant *C = 0; 173cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner const Type *ArgTy = FTy->getParamType(i); 174cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner const GenericValue &AV = ArgValues[i]; 175cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner switch (ArgTy->getTypeID()) { 176cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner default: assert(0 && "Unknown argument type for function call!"); 177cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::BoolTyID: C = ConstantBool::get(AV.BoolVal); break; 178cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::SByteTyID: C = ConstantSInt::get(ArgTy, AV.SByteVal); break; 179cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UByteTyID: C = ConstantUInt::get(ArgTy, AV.UByteVal); break; 180cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::ShortTyID: C = ConstantSInt::get(ArgTy, AV.ShortVal); break; 181cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UShortTyID: C = ConstantUInt::get(ArgTy, AV.UShortVal); break; 182cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::IntTyID: C = ConstantSInt::get(ArgTy, AV.IntVal); break; 183cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UIntTyID: C = ConstantUInt::get(ArgTy, AV.UIntVal); break; 184cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::LongTyID: C = ConstantSInt::get(ArgTy, AV.LongVal); break; 185cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::ULongTyID: C = ConstantUInt::get(ArgTy, AV.ULongVal); break; 186cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::FloatTyID: C = ConstantFP ::get(ArgTy, AV.FloatVal); break; 187cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::DoubleTyID: C = ConstantFP ::get(ArgTy, AV.DoubleVal); break; 188cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::PointerTyID: 189cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner void *ArgPtr = GVTOP(AV); 190cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner if (sizeof(void*) == 4) { 191cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantSInt::get(Type::IntTy, (int)(intptr_t)ArgPtr); 192cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } else { 193cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantSInt::get(Type::LongTy, (intptr_t)ArgPtr); 194cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 195cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantExpr::getCast(C, ArgTy); // Cast the integer to pointer 196cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner break; 197cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 198cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Args.push_back(C); 199cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 200cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 201cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Value *TheCall = new CallInst(F, Args, "", StubBB); 202cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner if (TheCall->getType() != Type::VoidTy) 203cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner new ReturnInst(TheCall, StubBB); // Return result of the call. 204cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner else 205cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner new ReturnInst(StubBB); // Just return void. 206cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 207cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Finally, return the value returned by our nullary stub function. 208cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner return runFunction(Stub, std::vector<GenericValue>()); 209bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner} 2104d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2114d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// runJITOnFunction - Run the FunctionPassManager full of 2124d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// just-in-time compilation passes on F, hopefully filling in 2134d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// GlobalAddress[F] with the address of F's machine code. 2144d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 2154d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid JIT::runJITOnFunction(Function *F) { 2164d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner static bool isAlreadyCodeGenerating = false; 2174d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!"); 2184d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2194d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // JIT the function 2204d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner isAlreadyCodeGenerating = true; 2214d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner PM.run(*F); 2224d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner isAlreadyCodeGenerating = false; 223c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 224c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the function referred to a global variable that had not yet been 225c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // emitted, it allocates memory for the global, but doesn't emit it yet. Emit 226c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // all of these globals now. 227c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner while (!PendingGlobals.empty()) { 228c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner const GlobalVariable *GV = PendingGlobals.back(); 229c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner PendingGlobals.pop_back(); 230c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner EmitGlobalVariable(GV); 231c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 2324d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 2334d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2344d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// getPointerToFunction - This method is used to get the address of the 2354d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// specified function, compiling it if neccesary. 2364d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 2374d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid *JIT::getPointerToFunction(Function *F) { 238c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (void *Addr = getPointerToGlobalIfAvailable(F)) 239c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Addr; // Check if function already code gen'd 2404d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2414d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Make sure we read in the function if it exists in this Module 2420050ef831912eea2377c815bc59c09ed828f2684Chris Lattner if (F->hasNotBeenReadFromBytecode()) 2430050ef831912eea2377c815bc59c09ed828f2684Chris Lattner try { 2440050ef831912eea2377c815bc59c09ed828f2684Chris Lattner MP->materializeFunction(F); 2450050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } catch ( std::string& errmsg ) { 2460050ef831912eea2377c815bc59c09ed828f2684Chris Lattner std::cerr << "Error reading function '" << F->getName() 2470050ef831912eea2377c815bc59c09ed828f2684Chris Lattner << "' from bytecode file: " << errmsg << "\n"; 2480050ef831912eea2377c815bc59c09ed828f2684Chris Lattner abort(); 2490050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } catch (...) { 2500050ef831912eea2377c815bc59c09ed828f2684Chris Lattner std::cerr << "Error reading function '" << F->getName() 2510050ef831912eea2377c815bc59c09ed828f2684Chris Lattner << "from bytecode file!\n"; 2520050ef831912eea2377c815bc59c09ed828f2684Chris Lattner abort(); 2530050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } 2544d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 255c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (F->isExternal()) { 256c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToNamedFunction(F->getName()); 257c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(F, Addr); 258c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Addr; 259c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 2604d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2614d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner runJITOnFunction(F); 262c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 263c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToGlobalIfAvailable(F); 2644d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(Addr && "Code generation didn't add function to GlobalAddress table!"); 2654d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner return Addr; 2664d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 2674d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2684d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner// getPointerToFunctionOrStub - If the specified function has been 2694d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner// code-gen'd, return a pointer to the function. If not, compile it, or use 2704d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner// a stub to implement lazy compilation if available. 2714d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner// 2724d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid *JIT::getPointerToFunctionOrStub(Function *F) { 2734d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // If we have already code generated the function, just return the address. 274c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (void *Addr = getPointerToGlobalIfAvailable(F)) 275c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Addr; 2764d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2774d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Otherwise, if the target doesn't support it, just codegen the function. 2784d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner return getPointerToFunction(F); 2794d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 2804d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 281c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// getOrEmitGlobalVariable - Return the address of the specified global 282c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// variable, possibly emitting it to memory if needed. This is used by the 283c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// Emitter. 284c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattnervoid *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) { 285c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Ptr = getPointerToGlobalIfAvailable(GV); 286c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (Ptr) return Ptr; 287c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 288c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the global is external, just remember the address. 289c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (GV->isExternal()) { 290df5a37efc997288da520ff4889443e3560d95387Reid Spencer Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName().c_str()); 291c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (Ptr == 0) { 292c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner std::cerr << "Could not resolve external global address: " 293c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner << GV->getName() << "\n"; 294c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner abort(); 295c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 296c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } else { 297c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the global hasn't been emitted to memory yet, allocate space. We will 298c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // actually initialize the global after current function has finished 299c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // compilation. 300c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner Ptr =new char[getTargetData().getTypeSize(GV->getType()->getElementType())]; 301c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner PendingGlobals.push_back(GV); 302c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 303c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(GV, Ptr); 304c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Ptr; 305c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner} 306c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 307c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 3084d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// recompileAndRelinkFunction - This method is used to force a function 3094d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// which has already been compiled, to be compiled again, possibly 3104d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// after it has been modified. Then the entry to the old copy is overwritten 3114d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// with a branch to the new copy. If there was no old copy, this acts 3124d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// just like JIT::getPointerToFunction(). 3134d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 3144d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid *JIT::recompileAndRelinkFunction(Function *F) { 315c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *OldAddr = getPointerToGlobalIfAvailable(F); 3164d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 317c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If it's not already compiled there is no reason to patch it up. 318c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (OldAddr == 0) { return getPointerToFunction(F); } 3194d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 320c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Delete the old function mapping. 321c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(F, 0); 322c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 323c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Recodegen the function 3244d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner runJITOnFunction(F); 325c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 326c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Update state, forward the old function to the new function. 327c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToGlobalIfAvailable(F); 3284d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(Addr && "Code generation didn't add function to GlobalAddress table!"); 3294d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner TJI.replaceMachineCodeForFunction(OldAddr, Addr); 3304d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner return Addr; 3314d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 332895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman 333895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman/// freeMachineCodeForFunction - release machine code memory for given Function 334895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman/// 335895eddfad43f848d5accce1789aa80be0db459d3Misha Brukmanvoid JIT::freeMachineCodeForFunction(Function *F) { 336895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman // currently a no-op 337895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman} 338