JIT.cpp revision e7fd553b3be8b95dc0946cd3267bc2db859cd3d8
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" 25e7fd553b3be8b95dc0946cd3267bc2db859cd3d8Chris Lattner#include "llvm/Support/MutexGuard.h" 26df5a37efc997288da520ff4889443e3560d95387Reid Spencer#include "llvm/System/DynamicLibrary.h" 27bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner#include "llvm/Target/TargetMachine.h" 284d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner#include "llvm/Target/TargetJITInfo.h" 29954da37bb492b519f5c31dc360f2a142567e08b4Reid Spencer#include <iostream> 30c19aadee66b744311afe6e420847e80822a765f2Chris Lattnerusing namespace llvm; 31abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman 322fe4bb06c6c40d16b7a5ae9cdf6bb6fe94d51be0Chris Lattnerstatic struct RegisterJIT { 332fe4bb06c6c40d16b7a5ae9cdf6bb6fe94d51be0Chris Lattner RegisterJIT() { JIT::Register(); } 342fe4bb06c6c40d16b7a5ae9cdf6bb6fe94d51be0Chris Lattner} JITRegistrator; 352fe4bb06c6c40d16b7a5ae9cdf6bb6fe94d51be0Chris Lattner 362f51914d828b462b054195e73c75448f24e01979Jeff Cohennamespace llvm { 372f51914d828b462b054195e73c75448f24e01979Jeff Cohen void LinkInJIT() { 382f51914d828b462b054195e73c75448f24e01979Jeff Cohen } 392f51914d828b462b054195e73c75448f24e01979Jeff Cohen} 402f51914d828b462b054195e73c75448f24e01979Jeff Cohen 414d326fa9bea5b80147edf14d1521fc41ce315275Chris LattnerJIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji) 42ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer : ExecutionEngine(MP), TM(tm), TJI(tji), state(MP) { 43bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner setTargetData(TM.getTargetData()); 44abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman 45abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman // Initialize MCE 46906f5fa5c8bb790201c79a33ea6d906f9f57f827Misha Brukman MCE = createEmitter(*this); 47f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 4850872d5385463cf1d2e23a758516e7f818e1af24Brian Gaeke // Add target data 49ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 50ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer FunctionPassManager& PM = state.getPM(locked); 51b93b0347d8715e9f2ded1dc56a086f92aeedfb86Chris Lattner PM.add(new TargetData(*TM.getTargetData())); 5250872d5385463cf1d2e23a758516e7f818e1af24Brian Gaeke 534d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Compile LLVM Code down to machine code in the intermediate representation 544d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner TJI.addPassesToJITCompile(PM); 554d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 564d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Turn the machine code intermediate representation into bytes in memory that 574d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // may be executed. 584d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner if (TM.addPassesToEmitMachineCode(PM, *MCE)) { 59cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner std::cerr << "Target '" << TM.getName() 604d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner << "' doesn't support machine code emission!\n"; 614d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner abort(); 624d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner } 63bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner} 64bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner 654d326fa9bea5b80147edf14d1521fc41ce315275Chris LattnerJIT::~JIT() { 664d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner delete MCE; 674d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner delete &TM; 684d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 694d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 7070975eef572b9e132bbaade16ba9edb76f15f287Brian Gaeke/// run - Start execution with the specified function and arguments. 7105a1a306bcfba2b533dc1210d24924e5f3e9ed0eChris Lattner/// 72ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris LattnerGenericValue JIT::runFunction(Function *F, 73ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris Lattner const std::vector<GenericValue> &ArgValues) { 74b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner assert(F && "Function *F was null at entry to run()"); 75b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner 76b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner void *FPtr = getPointerToFunction(F); 777c45d7898bdfdc29a61a58b678e13ed41333ed51Chris Lattner assert(FPtr && "Pointer to fn's code was null after getPointerToFunction"); 78f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner const FunctionType *FTy = F->getFunctionType(); 79e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner const Type *RetTy = FTy->getReturnType(); 80bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner 81e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner assert((FTy->getNumParams() <= ArgValues.size() || FTy->isVarArg()) && 82e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner "Too many arguments passed into function!"); 83e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner assert(FTy->getNumParams() == ArgValues.size() && 84e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner "This doesn't support passing arguments through varargs (yet)!"); 85e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner 86ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman // Handle some common cases first. These cases correspond to common `main' 87e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner // prototypes. 88d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner if (RetTy == Type::IntTy || RetTy == Type::UIntTy || RetTy == Type::VoidTy) { 89f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner switch (ArgValues.size()) { 90f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner case 3: 91f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if ((FTy->getParamType(0) == Type::IntTy || 92f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner FTy->getParamType(0) == Type::UIntTy) && 93f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner isa<PointerType>(FTy->getParamType(1)) && 94f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner isa<PointerType>(FTy->getParamType(2))) { 95f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner int (*PF)(int, char **, const char **) = 96f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner (int(*)(int, char **, const char **))FPtr; 97ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman 98f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner // Call the function. 99e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 100f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner rv.IntVal = PF(ArgValues[0].IntVal, (char **)GVTOP(ArgValues[1]), 101f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner (const char **)GVTOP(ArgValues[2])); 102f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner return rv; 103f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner } 104f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner break; 105174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner case 2: 106f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if ((FTy->getParamType(0) == Type::IntTy || 107174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner FTy->getParamType(0) == Type::UIntTy) && 108174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner isa<PointerType>(FTy->getParamType(1))) { 109174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner int (*PF)(int, char **) = (int(*)(int, char **))FPtr; 110ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman 111174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner // Call the function. 112174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner GenericValue rv; 113174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner rv.IntVal = PF(ArgValues[0].IntVal, (char **)GVTOP(ArgValues[1])); 114174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner return rv; 115174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner } 116174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner break; 117f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner case 1: 118f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner if (FTy->getNumParams() == 1 && 119f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman (FTy->getParamType(0) == Type::IntTy || 120f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner FTy->getParamType(0) == Type::UIntTy)) { 121e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 122f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner int (*PF)(int) = (int(*)(int))FPtr; 123f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner rv.IntVal = PF(ArgValues[0].IntVal); 124f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner return rv; 125f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner } 126f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner break; 127e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner } 128e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner } 129e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner 130e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner // Handle cases where no arguments are passed first. 131e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner if (ArgValues.empty()) { 132e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 133e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner switch (RetTy->getTypeID()) { 134e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner default: assert(0 && "Unknown return type for function call!"); 135e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::BoolTyID: 136e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.BoolVal = ((bool(*)())FPtr)(); 137e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 138e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::SByteTyID: 139e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UByteTyID: 140e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.SByteVal = ((char(*)())FPtr)(); 141e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 142e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::ShortTyID: 143e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UShortTyID: 144e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.ShortVal = ((short(*)())FPtr)(); 145e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 146e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::VoidTyID: 147e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::IntTyID: 148e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UIntTyID: 149e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.IntVal = ((int(*)())FPtr)(); 150e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 151e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::LongTyID: 152e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::ULongTyID: 153e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.LongVal = ((int64_t(*)())FPtr)(); 154e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 155e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::FloatTyID: 156e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.FloatVal = ((float(*)())FPtr)(); 157e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 158e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::DoubleTyID: 159e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.DoubleVal = ((double(*)())FPtr)(); 160d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner return rv; 161e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::PointerTyID: 162e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return PTOGV(((void*(*)())FPtr)()); 163d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner } 164ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris Lattner } 16570975eef572b9e132bbaade16ba9edb76f15f287Brian Gaeke 166cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Okay, this is not one of our quick and easy cases. Because we don't have a 167cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // full FFI, we have to codegen a nullary stub function that just calls the 168cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // function we are interested in, passing in constants for all of the 169cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // arguments. Make this function and return. 170cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 171cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // First, create the function. 172cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner FunctionType *STy=FunctionType::get(RetTy, std::vector<const Type*>(), false); 173cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Function *Stub = new Function(STy, Function::InternalLinkage, "", 174cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner F->getParent()); 175cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 176cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Insert a basic block. 177cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner BasicBlock *StubBB = new BasicBlock("", Stub); 178cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 179cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Convert all of the GenericValue arguments over to constants. Note that we 180cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // currently don't support varargs. 181cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner std::vector<Value*> Args; 182cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) { 183cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Constant *C = 0; 184cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner const Type *ArgTy = FTy->getParamType(i); 185cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner const GenericValue &AV = ArgValues[i]; 186cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner switch (ArgTy->getTypeID()) { 187cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner default: assert(0 && "Unknown argument type for function call!"); 188cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::BoolTyID: C = ConstantBool::get(AV.BoolVal); break; 189cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::SByteTyID: C = ConstantSInt::get(ArgTy, AV.SByteVal); break; 190cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UByteTyID: C = ConstantUInt::get(ArgTy, AV.UByteVal); break; 191cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::ShortTyID: C = ConstantSInt::get(ArgTy, AV.ShortVal); break; 192cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UShortTyID: C = ConstantUInt::get(ArgTy, AV.UShortVal); break; 193cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::IntTyID: C = ConstantSInt::get(ArgTy, AV.IntVal); break; 194cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UIntTyID: C = ConstantUInt::get(ArgTy, AV.UIntVal); break; 195cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::LongTyID: C = ConstantSInt::get(ArgTy, AV.LongVal); break; 196cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::ULongTyID: C = ConstantUInt::get(ArgTy, AV.ULongVal); break; 197cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::FloatTyID: C = ConstantFP ::get(ArgTy, AV.FloatVal); break; 198cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::DoubleTyID: C = ConstantFP ::get(ArgTy, AV.DoubleVal); break; 199cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::PointerTyID: 200cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner void *ArgPtr = GVTOP(AV); 201cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner if (sizeof(void*) == 4) { 202cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantSInt::get(Type::IntTy, (int)(intptr_t)ArgPtr); 203cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } else { 204cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantSInt::get(Type::LongTy, (intptr_t)ArgPtr); 205cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 206cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantExpr::getCast(C, ArgTy); // Cast the integer to pointer 207cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner break; 208cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 209cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Args.push_back(C); 210cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 211cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 212a471e045b7cef5da428bdada4a362a4be671ef0bChris Lattner CallInst *TheCall = new CallInst(F, Args, "", StubBB); 213a471e045b7cef5da428bdada4a362a4be671ef0bChris Lattner TheCall->setTailCall(); 214cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner if (TheCall->getType() != Type::VoidTy) 215cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner new ReturnInst(TheCall, StubBB); // Return result of the call. 216cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner else 217cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner new ReturnInst(StubBB); // Just return void. 218cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 219cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Finally, return the value returned by our nullary stub function. 220cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner return runFunction(Stub, std::vector<GenericValue>()); 221bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner} 2224d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2234d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// runJITOnFunction - Run the FunctionPassManager full of 2244d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// just-in-time compilation passes on F, hopefully filling in 2254d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// GlobalAddress[F] with the address of F's machine code. 2264d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 2274d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid JIT::runJITOnFunction(Function *F) { 2284d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner static bool isAlreadyCodeGenerating = false; 2294d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!"); 23000b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohen 231ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 2324d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2334d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // JIT the function 2344d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner isAlreadyCodeGenerating = true; 235ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer state.getPM(locked).run(*F); 2364d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner isAlreadyCodeGenerating = false; 237c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 238c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the function referred to a global variable that had not yet been 239c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // emitted, it allocates memory for the global, but doesn't emit it yet. Emit 240c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // all of these globals now. 241ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer while (!state.getPendingGlobals(locked).empty()) { 242ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer const GlobalVariable *GV = state.getPendingGlobals(locked).back(); 243ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer state.getPendingGlobals(locked).pop_back(); 244c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner EmitGlobalVariable(GV); 245c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 2464d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 2474d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2484d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// getPointerToFunction - This method is used to get the address of the 2494d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// specified function, compiling it if neccesary. 2504d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 2514d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid *JIT::getPointerToFunction(Function *F) { 252ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 253ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer 254c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (void *Addr = getPointerToGlobalIfAvailable(F)) 255c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Addr; // Check if function already code gen'd 2564d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2574d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Make sure we read in the function if it exists in this Module 258f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if (F->hasNotBeenReadFromBytecode()) 2590050ef831912eea2377c815bc59c09ed828f2684Chris Lattner try { 2600050ef831912eea2377c815bc59c09ed828f2684Chris Lattner MP->materializeFunction(F); 2610050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } catch ( std::string& errmsg ) { 2620050ef831912eea2377c815bc59c09ed828f2684Chris Lattner std::cerr << "Error reading function '" << F->getName() 2630050ef831912eea2377c815bc59c09ed828f2684Chris Lattner << "' from bytecode file: " << errmsg << "\n"; 2640050ef831912eea2377c815bc59c09ed828f2684Chris Lattner abort(); 2650050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } catch (...) { 2660050ef831912eea2377c815bc59c09ed828f2684Chris Lattner std::cerr << "Error reading function '" << F->getName() 2670050ef831912eea2377c815bc59c09ed828f2684Chris Lattner << "from bytecode file!\n"; 2680050ef831912eea2377c815bc59c09ed828f2684Chris Lattner abort(); 2690050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } 2704d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 271c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (F->isExternal()) { 272c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToNamedFunction(F->getName()); 273c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(F, Addr); 274c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Addr; 275c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 2764d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2774d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner runJITOnFunction(F); 278c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 279c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToGlobalIfAvailable(F); 2804d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(Addr && "Code generation didn't add function to GlobalAddress table!"); 2814d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner return Addr; 2824d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 2834d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 284c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// getOrEmitGlobalVariable - Return the address of the specified global 285c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// variable, possibly emitting it to memory if needed. This is used by the 286c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// Emitter. 287c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattnervoid *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) { 288ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 289ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer 290c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Ptr = getPointerToGlobalIfAvailable(GV); 291c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (Ptr) return Ptr; 292c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 293c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the global is external, just remember the address. 294c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (GV->isExternal()) { 295df5a37efc997288da520ff4889443e3560d95387Reid Spencer Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName().c_str()); 296c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (Ptr == 0) { 297c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner std::cerr << "Could not resolve external global address: " 298c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner << GV->getName() << "\n"; 299c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner abort(); 300c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 301c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } else { 302c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the global hasn't been emitted to memory yet, allocate space. We will 303c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // actually initialize the global after current function has finished 304c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // compilation. 305f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner const Type *GlobalType = GV->getType()->getElementType(); 306a69571c7991813c93cba64e88eced6899ce93d81Owen Anderson size_t S = getTargetData()->getTypeSize(GlobalType); 307a69571c7991813c93cba64e88eced6899ce93d81Owen Anderson size_t A = getTargetData()->getTypeAlignment(GlobalType); 308f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner if (A <= 8) { 309f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner Ptr = malloc(S); 310f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner } else { 311f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner // Allocate S+A bytes of memory, then use an aligned pointer within that 312f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner // space. 313f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner Ptr = malloc(S+A); 314f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner unsigned MisAligned = ((intptr_t)Ptr & (A-1)); 315f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner unsigned Offset = MisAligned ? (A-MisAligned) : 0; 316f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner 317f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner // Trim the tail off the memory block. 318f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner realloc(Ptr, S+Offset); 319f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner Ptr = (char*)Ptr + Offset; 320f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner } 321ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer state.getPendingGlobals(locked).push_back(GV); 322c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 323c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(GV, Ptr); 324c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Ptr; 325c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner} 326c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 327c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 3284d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// recompileAndRelinkFunction - This method is used to force a function 3294d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// which has already been compiled, to be compiled again, possibly 3304d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// after it has been modified. Then the entry to the old copy is overwritten 3314d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// with a branch to the new copy. If there was no old copy, this acts 3324d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// just like JIT::getPointerToFunction(). 3334d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 3344d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid *JIT::recompileAndRelinkFunction(Function *F) { 335c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *OldAddr = getPointerToGlobalIfAvailable(F); 3364d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 337c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If it's not already compiled there is no reason to patch it up. 338c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (OldAddr == 0) { return getPointerToFunction(F); } 3394d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 340c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Delete the old function mapping. 341c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(F, 0); 342c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 343c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Recodegen the function 3444d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner runJITOnFunction(F); 345c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 346c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Update state, forward the old function to the new function. 347c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToGlobalIfAvailable(F); 3484d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(Addr && "Code generation didn't add function to GlobalAddress table!"); 3494d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner TJI.replaceMachineCodeForFunction(OldAddr, Addr); 3504d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner return Addr; 3514d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 352895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman 353