JIT.cpp revision 2fe4bb06c6c40d16b7a5ae9cdf6bb6fe94d51be0
14d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===// 2f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 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. 7f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman// 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> 29c19aadee66b744311afe6e420847e80822a765f2Chris Lattnerusing namespace llvm; 30abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman 312fe4bb06c6c40d16b7a5ae9cdf6bb6fe94d51be0Chris Lattnerstatic struct RegisterJIT { 322fe4bb06c6c40d16b7a5ae9cdf6bb6fe94d51be0Chris Lattner RegisterJIT() { JIT::Register(); } 332fe4bb06c6c40d16b7a5ae9cdf6bb6fe94d51be0Chris Lattner} JITRegistrator; 342fe4bb06c6c40d16b7a5ae9cdf6bb6fe94d51be0Chris Lattner 354d326fa9bea5b80147edf14d1521fc41ce315275Chris LattnerJIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji) 36ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer : ExecutionEngine(MP), TM(tm), TJI(tji), state(MP) { 37bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner setTargetData(TM.getTargetData()); 38abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman 39abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman // Initialize MCE 40906f5fa5c8bb790201c79a33ea6d906f9f57f827Misha Brukman MCE = createEmitter(*this); 41f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 4250872d5385463cf1d2e23a758516e7f818e1af24Brian Gaeke // Add target data 43ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 44ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer FunctionPassManager& PM = state.getPM(locked); 45cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner PM.add(new TargetData(TM.getTargetData())); 4650872d5385463cf1d2e23a758516e7f818e1af24Brian Gaeke 474d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Compile LLVM Code down to machine code in the intermediate representation 484d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner TJI.addPassesToJITCompile(PM); 494d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 504d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Turn the machine code intermediate representation into bytes in memory that 514d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // may be executed. 524d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner if (TM.addPassesToEmitMachineCode(PM, *MCE)) { 53cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner std::cerr << "Target '" << TM.getName() 544d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner << "' doesn't support machine code emission!\n"; 554d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner abort(); 564d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner } 57bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner} 58bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner 594d326fa9bea5b80147edf14d1521fc41ce315275Chris LattnerJIT::~JIT() { 604d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner delete MCE; 614d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner delete &TM; 624d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 634d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 6470975eef572b9e132bbaade16ba9edb76f15f287Brian Gaeke/// run - Start execution with the specified function and arguments. 6505a1a306bcfba2b533dc1210d24924e5f3e9ed0eChris Lattner/// 66ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris LattnerGenericValue JIT::runFunction(Function *F, 67ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris Lattner const std::vector<GenericValue> &ArgValues) { 68b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner assert(F && "Function *F was null at entry to run()"); 69b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner 70b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner void *FPtr = getPointerToFunction(F); 717c45d7898bdfdc29a61a58b678e13ed41333ed51Chris Lattner assert(FPtr && "Pointer to fn's code was null after getPointerToFunction"); 72f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner const FunctionType *FTy = F->getFunctionType(); 73e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner const Type *RetTy = FTy->getReturnType(); 74bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner 75e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner assert((FTy->getNumParams() <= ArgValues.size() || FTy->isVarArg()) && 76e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner "Too many arguments passed into function!"); 77e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner assert(FTy->getNumParams() == ArgValues.size() && 78e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner "This doesn't support passing arguments through varargs (yet)!"); 79e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner 80ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman // Handle some common cases first. These cases correspond to common `main' 81e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner // prototypes. 82d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner if (RetTy == Type::IntTy || RetTy == Type::UIntTy || RetTy == Type::VoidTy) { 83f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner switch (ArgValues.size()) { 84f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner case 3: 85f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if ((FTy->getParamType(0) == Type::IntTy || 86f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner FTy->getParamType(0) == Type::UIntTy) && 87f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner isa<PointerType>(FTy->getParamType(1)) && 88f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner isa<PointerType>(FTy->getParamType(2))) { 89f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner int (*PF)(int, char **, const char **) = 90f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner (int(*)(int, char **, const char **))FPtr; 91ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman 92f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner // Call the function. 93e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 94f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner rv.IntVal = PF(ArgValues[0].IntVal, (char **)GVTOP(ArgValues[1]), 95f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner (const char **)GVTOP(ArgValues[2])); 96f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner return rv; 97f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner } 98f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner break; 99174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner case 2: 100f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if ((FTy->getParamType(0) == Type::IntTy || 101174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner FTy->getParamType(0) == Type::UIntTy) && 102174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner isa<PointerType>(FTy->getParamType(1))) { 103174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner int (*PF)(int, char **) = (int(*)(int, char **))FPtr; 104ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman 105174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner // Call the function. 106174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner GenericValue rv; 107174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner rv.IntVal = PF(ArgValues[0].IntVal, (char **)GVTOP(ArgValues[1])); 108174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner return rv; 109174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner } 110174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner break; 111f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner case 1: 112f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner if (FTy->getNumParams() == 1 && 113f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman (FTy->getParamType(0) == Type::IntTy || 114f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner FTy->getParamType(0) == Type::UIntTy)) { 115e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 116f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner int (*PF)(int) = (int(*)(int))FPtr; 117f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner rv.IntVal = PF(ArgValues[0].IntVal); 118f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner return rv; 119f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner } 120f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner break; 121e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner } 122e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner } 123e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner 124e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner // Handle cases where no arguments are passed first. 125e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner if (ArgValues.empty()) { 126e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 127e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner switch (RetTy->getTypeID()) { 128e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner default: assert(0 && "Unknown return type for function call!"); 129e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::BoolTyID: 130e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.BoolVal = ((bool(*)())FPtr)(); 131e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 132e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::SByteTyID: 133e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UByteTyID: 134e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.SByteVal = ((char(*)())FPtr)(); 135e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 136e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::ShortTyID: 137e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UShortTyID: 138e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.ShortVal = ((short(*)())FPtr)(); 139e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 140e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::VoidTyID: 141e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::IntTyID: 142e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UIntTyID: 143e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.IntVal = ((int(*)())FPtr)(); 144e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 145e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::LongTyID: 146e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::ULongTyID: 147e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.LongVal = ((int64_t(*)())FPtr)(); 148e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 149e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::FloatTyID: 150e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.FloatVal = ((float(*)())FPtr)(); 151e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 152e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::DoubleTyID: 153e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.DoubleVal = ((double(*)())FPtr)(); 154d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner return rv; 155e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::PointerTyID: 156e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return PTOGV(((void*(*)())FPtr)()); 157d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner } 158ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris Lattner } 15970975eef572b9e132bbaade16ba9edb76f15f287Brian Gaeke 160cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Okay, this is not one of our quick and easy cases. Because we don't have a 161cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // full FFI, we have to codegen a nullary stub function that just calls the 162cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // function we are interested in, passing in constants for all of the 163cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // arguments. Make this function and return. 164cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 165cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // First, create the function. 166cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner FunctionType *STy=FunctionType::get(RetTy, std::vector<const Type*>(), false); 167cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Function *Stub = new Function(STy, Function::InternalLinkage, "", 168cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner F->getParent()); 169cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 170cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Insert a basic block. 171cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner BasicBlock *StubBB = new BasicBlock("", Stub); 172cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 173cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Convert all of the GenericValue arguments over to constants. Note that we 174cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // currently don't support varargs. 175cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner std::vector<Value*> Args; 176cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) { 177cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Constant *C = 0; 178cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner const Type *ArgTy = FTy->getParamType(i); 179cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner const GenericValue &AV = ArgValues[i]; 180cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner switch (ArgTy->getTypeID()) { 181cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner default: assert(0 && "Unknown argument type for function call!"); 182cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::BoolTyID: C = ConstantBool::get(AV.BoolVal); break; 183cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::SByteTyID: C = ConstantSInt::get(ArgTy, AV.SByteVal); break; 184cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UByteTyID: C = ConstantUInt::get(ArgTy, AV.UByteVal); break; 185cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::ShortTyID: C = ConstantSInt::get(ArgTy, AV.ShortVal); break; 186cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UShortTyID: C = ConstantUInt::get(ArgTy, AV.UShortVal); break; 187cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::IntTyID: C = ConstantSInt::get(ArgTy, AV.IntVal); break; 188cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UIntTyID: C = ConstantUInt::get(ArgTy, AV.UIntVal); break; 189cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::LongTyID: C = ConstantSInt::get(ArgTy, AV.LongVal); break; 190cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::ULongTyID: C = ConstantUInt::get(ArgTy, AV.ULongVal); break; 191cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::FloatTyID: C = ConstantFP ::get(ArgTy, AV.FloatVal); break; 192cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::DoubleTyID: C = ConstantFP ::get(ArgTy, AV.DoubleVal); break; 193cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::PointerTyID: 194cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner void *ArgPtr = GVTOP(AV); 195cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner if (sizeof(void*) == 4) { 196cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantSInt::get(Type::IntTy, (int)(intptr_t)ArgPtr); 197cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } else { 198cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantSInt::get(Type::LongTy, (intptr_t)ArgPtr); 199cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 200cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantExpr::getCast(C, ArgTy); // Cast the integer to pointer 201cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner break; 202cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 203cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Args.push_back(C); 204cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 205cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 206a471e045b7cef5da428bdada4a362a4be671ef0bChris Lattner CallInst *TheCall = new CallInst(F, Args, "", StubBB); 207a471e045b7cef5da428bdada4a362a4be671ef0bChris Lattner TheCall->setTailCall(); 208cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner if (TheCall->getType() != Type::VoidTy) 209cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner new ReturnInst(TheCall, StubBB); // Return result of the call. 210cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner else 211cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner new ReturnInst(StubBB); // Just return void. 212cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 213cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Finally, return the value returned by our nullary stub function. 214cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner return runFunction(Stub, std::vector<GenericValue>()); 215bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner} 2164d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2174d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// runJITOnFunction - Run the FunctionPassManager full of 2184d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// just-in-time compilation passes on F, hopefully filling in 2194d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// GlobalAddress[F] with the address of F's machine code. 2204d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 2214d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid JIT::runJITOnFunction(Function *F) { 2224d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner static bool isAlreadyCodeGenerating = false; 2234d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!"); 22400b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohen 225ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 2264d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2274d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // JIT the function 2284d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner isAlreadyCodeGenerating = true; 229ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer state.getPM(locked).run(*F); 2304d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner isAlreadyCodeGenerating = false; 231c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 232c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the function referred to a global variable that had not yet been 233c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // emitted, it allocates memory for the global, but doesn't emit it yet. Emit 234c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // all of these globals now. 235ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer while (!state.getPendingGlobals(locked).empty()) { 236ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer const GlobalVariable *GV = state.getPendingGlobals(locked).back(); 237ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer state.getPendingGlobals(locked).pop_back(); 238c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner EmitGlobalVariable(GV); 239c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 2404d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 2414d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2424d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// getPointerToFunction - This method is used to get the address of the 2434d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// specified function, compiling it if neccesary. 2444d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 2454d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid *JIT::getPointerToFunction(Function *F) { 246ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 247ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer 248c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (void *Addr = getPointerToGlobalIfAvailable(F)) 249c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Addr; // Check if function already code gen'd 2504d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2514d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Make sure we read in the function if it exists in this Module 252f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if (F->hasNotBeenReadFromBytecode()) 2530050ef831912eea2377c815bc59c09ed828f2684Chris Lattner try { 2540050ef831912eea2377c815bc59c09ed828f2684Chris Lattner MP->materializeFunction(F); 2550050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } catch ( std::string& errmsg ) { 2560050ef831912eea2377c815bc59c09ed828f2684Chris Lattner std::cerr << "Error reading function '" << F->getName() 2570050ef831912eea2377c815bc59c09ed828f2684Chris Lattner << "' from bytecode file: " << errmsg << "\n"; 2580050ef831912eea2377c815bc59c09ed828f2684Chris Lattner abort(); 2590050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } catch (...) { 2600050ef831912eea2377c815bc59c09ed828f2684Chris Lattner std::cerr << "Error reading function '" << F->getName() 2610050ef831912eea2377c815bc59c09ed828f2684Chris Lattner << "from bytecode file!\n"; 2620050ef831912eea2377c815bc59c09ed828f2684Chris Lattner abort(); 2630050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } 2644d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 265c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (F->isExternal()) { 266c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToNamedFunction(F->getName()); 267c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(F, Addr); 268c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Addr; 269c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 2704d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2714d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner runJITOnFunction(F); 272c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 273c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToGlobalIfAvailable(F); 2744d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(Addr && "Code generation didn't add function to GlobalAddress table!"); 2754d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner return Addr; 2764d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 2774d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 278c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// getOrEmitGlobalVariable - Return the address of the specified global 279c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// variable, possibly emitting it to memory if needed. This is used by the 280c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// Emitter. 281c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattnervoid *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) { 282ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 283ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer 284c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Ptr = getPointerToGlobalIfAvailable(GV); 285c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (Ptr) return Ptr; 286c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 287c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the global is external, just remember the address. 288c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (GV->isExternal()) { 289df5a37efc997288da520ff4889443e3560d95387Reid Spencer Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName().c_str()); 290c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (Ptr == 0) { 291c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner std::cerr << "Could not resolve external global address: " 292c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner << GV->getName() << "\n"; 293c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner abort(); 294c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 295c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } else { 296c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the global hasn't been emitted to memory yet, allocate space. We will 297c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // actually initialize the global after current function has finished 298c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // compilation. 299a8101c163dfb7a8c63f5ac74e878538245802fa4Chris Lattner uint64_t S = getTargetData().getTypeSize(GV->getType()->getElementType()); 30051e6a38b868b33fb5c3dcb3d502239affe762c80Chris Lattner unsigned char A = 30151e6a38b868b33fb5c3dcb3d502239affe762c80Chris Lattner getTargetData().getTypeAlignment(GV->getType()->getElementType()); 3026a9746127a168306a670eaff11925605dbea9d4fAndrew Lenharth Ptr = MCE->allocateGlobal(S, A); 303ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer state.getPendingGlobals(locked).push_back(GV); 304c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 305c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(GV, Ptr); 306c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Ptr; 307c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner} 308c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 309c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 3104d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// recompileAndRelinkFunction - This method is used to force a function 3114d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// which has already been compiled, to be compiled again, possibly 3124d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// after it has been modified. Then the entry to the old copy is overwritten 3134d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// with a branch to the new copy. If there was no old copy, this acts 3144d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// just like JIT::getPointerToFunction(). 3154d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 3164d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid *JIT::recompileAndRelinkFunction(Function *F) { 317c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *OldAddr = getPointerToGlobalIfAvailable(F); 3184d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 319c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If it's not already compiled there is no reason to patch it up. 320c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (OldAddr == 0) { return getPointerToFunction(F); } 3214d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 322c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Delete the old function mapping. 323c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(F, 0); 324c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 325c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Recodegen the function 3264d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner runJITOnFunction(F); 327c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 328c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Update state, forward the old function to the new function. 329c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToGlobalIfAvailable(F); 3304d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(Addr && "Code generation didn't add function to GlobalAddress table!"); 3314d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner TJI.replaceMachineCodeForFunction(OldAddr, Addr); 3324d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner return Addr; 3334d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 334895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman 335895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman/// freeMachineCodeForFunction - release machine code memory for given Function 336895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman/// 337895eddfad43f848d5accce1789aa80be0db459d3Misha Brukmanvoid JIT::freeMachineCodeForFunction(Function *F) { 338895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman // currently a no-op 339895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman} 340