JIT.cpp revision b93b0347d8715e9f2ded1dc56a086f92aeedfb86
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 352f51914d828b462b054195e73c75448f24e01979Jeff Cohennamespace llvm { 362f51914d828b462b054195e73c75448f24e01979Jeff Cohen void LinkInJIT() { 372f51914d828b462b054195e73c75448f24e01979Jeff Cohen } 382f51914d828b462b054195e73c75448f24e01979Jeff Cohen} 392f51914d828b462b054195e73c75448f24e01979Jeff Cohen 404d326fa9bea5b80147edf14d1521fc41ce315275Chris LattnerJIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji) 41ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer : ExecutionEngine(MP), TM(tm), TJI(tji), state(MP) { 42bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner setTargetData(TM.getTargetData()); 43abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman 44abb027cf412944db4d27579ba3ae00717d23c25eMisha Brukman // Initialize MCE 45906f5fa5c8bb790201c79a33ea6d906f9f57f827Misha Brukman MCE = createEmitter(*this); 46f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman 4750872d5385463cf1d2e23a758516e7f818e1af24Brian Gaeke // Add target data 48ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 49ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer FunctionPassManager& PM = state.getPM(locked); 50b93b0347d8715e9f2ded1dc56a086f92aeedfb86Chris Lattner PM.add(new TargetData(*TM.getTargetData())); 5150872d5385463cf1d2e23a758516e7f818e1af24Brian Gaeke 524d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Compile LLVM Code down to machine code in the intermediate representation 534d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner TJI.addPassesToJITCompile(PM); 544d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 554d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Turn the machine code intermediate representation into bytes in memory that 564d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // may be executed. 574d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner if (TM.addPassesToEmitMachineCode(PM, *MCE)) { 58cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner std::cerr << "Target '" << TM.getName() 594d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner << "' doesn't support machine code emission!\n"; 604d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner abort(); 614d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner } 62bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner} 63bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner 644d326fa9bea5b80147edf14d1521fc41ce315275Chris LattnerJIT::~JIT() { 654d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner delete MCE; 664d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner delete &TM; 674d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 684d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 6970975eef572b9e132bbaade16ba9edb76f15f287Brian Gaeke/// run - Start execution with the specified function and arguments. 7005a1a306bcfba2b533dc1210d24924e5f3e9ed0eChris Lattner/// 71ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris LattnerGenericValue JIT::runFunction(Function *F, 72ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris Lattner const std::vector<GenericValue> &ArgValues) { 73b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner assert(F && "Function *F was null at entry to run()"); 74b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner 75b47130c580385a5a2c922c480a85438b2bb80293Chris Lattner void *FPtr = getPointerToFunction(F); 767c45d7898bdfdc29a61a58b678e13ed41333ed51Chris Lattner assert(FPtr && "Pointer to fn's code was null after getPointerToFunction"); 77f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner const FunctionType *FTy = F->getFunctionType(); 78e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner const Type *RetTy = FTy->getReturnType(); 79bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner 80e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner assert((FTy->getNumParams() <= ArgValues.size() || FTy->isVarArg()) && 81e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner "Too many arguments passed into function!"); 82e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner assert(FTy->getNumParams() == ArgValues.size() && 83e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner "This doesn't support passing arguments through varargs (yet)!"); 84e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner 85ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman // Handle some common cases first. These cases correspond to common `main' 86e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner // prototypes. 87d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner if (RetTy == Type::IntTy || RetTy == Type::UIntTy || RetTy == Type::VoidTy) { 88f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner switch (ArgValues.size()) { 89f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner case 3: 90f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if ((FTy->getParamType(0) == Type::IntTy || 91f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner FTy->getParamType(0) == Type::UIntTy) && 92f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner isa<PointerType>(FTy->getParamType(1)) && 93f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner isa<PointerType>(FTy->getParamType(2))) { 94f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner int (*PF)(int, char **, const char **) = 95f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner (int(*)(int, char **, const char **))FPtr; 96ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman 97f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner // Call the function. 98e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 99f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner rv.IntVal = PF(ArgValues[0].IntVal, (char **)GVTOP(ArgValues[1]), 100f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner (const char **)GVTOP(ArgValues[2])); 101f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner return rv; 102f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner } 103f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner break; 104174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner case 2: 105f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if ((FTy->getParamType(0) == Type::IntTy || 106174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner FTy->getParamType(0) == Type::UIntTy) && 107174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner isa<PointerType>(FTy->getParamType(1))) { 108174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner int (*PF)(int, char **) = (int(*)(int, char **))FPtr; 109ec8430270a9f1adbf9b790319a1d4781658359fdMisha Brukman 110174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner // Call the function. 111174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner GenericValue rv; 112174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner rv.IntVal = PF(ArgValues[0].IntVal, (char **)GVTOP(ArgValues[1])); 113174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner return rv; 114174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner } 115174f2264649d9ae062bdb0a038131c2836596be5Chris Lattner break; 116f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner case 1: 117f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner if (FTy->getNumParams() == 1 && 118f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman (FTy->getParamType(0) == Type::IntTy || 119f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner FTy->getParamType(0) == Type::UIntTy)) { 120e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 121f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner int (*PF)(int) = (int(*)(int))FPtr; 122f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner rv.IntVal = PF(ArgValues[0].IntVal); 123f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner return rv; 124f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner } 125f7bedf447e080cb57c64d6f0cbf6fbeb9f4c596eChris Lattner break; 126e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner } 127e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner } 128e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner 129e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner // Handle cases where no arguments are passed first. 130e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner if (ArgValues.empty()) { 131e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner GenericValue rv; 132e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner switch (RetTy->getTypeID()) { 133e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner default: assert(0 && "Unknown return type for function call!"); 134e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::BoolTyID: 135e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.BoolVal = ((bool(*)())FPtr)(); 136e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 137e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::SByteTyID: 138e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UByteTyID: 139e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.SByteVal = ((char(*)())FPtr)(); 140e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 141e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::ShortTyID: 142e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UShortTyID: 143e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.ShortVal = ((short(*)())FPtr)(); 144e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 145e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::VoidTyID: 146e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::IntTyID: 147e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::UIntTyID: 148e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.IntVal = ((int(*)())FPtr)(); 149e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 150e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::LongTyID: 151e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::ULongTyID: 152e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.LongVal = ((int64_t(*)())FPtr)(); 153e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 154e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::FloatTyID: 155e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.FloatVal = ((float(*)())FPtr)(); 156e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return rv; 157e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::DoubleTyID: 158e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner rv.DoubleVal = ((double(*)())FPtr)(); 159d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner return rv; 160e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner case Type::PointerTyID: 161e5eab142a51373dd3bee758ea958575afbfce259Chris Lattner return PTOGV(((void*(*)())FPtr)()); 162d297aea5f24f2ad369162b8c1084cda4dcc839f0Chris Lattner } 163ff0f1bb32a439cf82cb09ee29544c894a2bfe877Chris Lattner } 16470975eef572b9e132bbaade16ba9edb76f15f287Brian Gaeke 165cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Okay, this is not one of our quick and easy cases. Because we don't have a 166cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // full FFI, we have to codegen a nullary stub function that just calls the 167cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // function we are interested in, passing in constants for all of the 168cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // arguments. Make this function and return. 169cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 170cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // First, create the function. 171cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner FunctionType *STy=FunctionType::get(RetTy, std::vector<const Type*>(), false); 172cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Function *Stub = new Function(STy, Function::InternalLinkage, "", 173cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner F->getParent()); 174cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 175cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Insert a basic block. 176cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner BasicBlock *StubBB = new BasicBlock("", Stub); 177cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 178cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Convert all of the GenericValue arguments over to constants. Note that we 179cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // currently don't support varargs. 180cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner std::vector<Value*> Args; 181cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) { 182cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Constant *C = 0; 183cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner const Type *ArgTy = FTy->getParamType(i); 184cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner const GenericValue &AV = ArgValues[i]; 185cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner switch (ArgTy->getTypeID()) { 186cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner default: assert(0 && "Unknown argument type for function call!"); 187cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::BoolTyID: C = ConstantBool::get(AV.BoolVal); break; 188cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::SByteTyID: C = ConstantSInt::get(ArgTy, AV.SByteVal); break; 189cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UByteTyID: C = ConstantUInt::get(ArgTy, AV.UByteVal); break; 190cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::ShortTyID: C = ConstantSInt::get(ArgTy, AV.ShortVal); break; 191cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UShortTyID: C = ConstantUInt::get(ArgTy, AV.UShortVal); break; 192cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::IntTyID: C = ConstantSInt::get(ArgTy, AV.IntVal); break; 193cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::UIntTyID: C = ConstantUInt::get(ArgTy, AV.UIntVal); break; 194cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::LongTyID: C = ConstantSInt::get(ArgTy, AV.LongVal); break; 195cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::ULongTyID: C = ConstantUInt::get(ArgTy, AV.ULongVal); break; 196cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::FloatTyID: C = ConstantFP ::get(ArgTy, AV.FloatVal); break; 197cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::DoubleTyID: C = ConstantFP ::get(ArgTy, AV.DoubleVal); break; 198cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner case Type::PointerTyID: 199cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner void *ArgPtr = GVTOP(AV); 200cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner if (sizeof(void*) == 4) { 201cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantSInt::get(Type::IntTy, (int)(intptr_t)ArgPtr); 202cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } else { 203cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantSInt::get(Type::LongTy, (intptr_t)ArgPtr); 204cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 205cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner C = ConstantExpr::getCast(C, ArgTy); // Cast the integer to pointer 206cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner break; 207cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 208cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner Args.push_back(C); 209cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner } 210cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 211a471e045b7cef5da428bdada4a362a4be671ef0bChris Lattner CallInst *TheCall = new CallInst(F, Args, "", StubBB); 212a471e045b7cef5da428bdada4a362a4be671ef0bChris Lattner TheCall->setTailCall(); 213cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner if (TheCall->getType() != Type::VoidTy) 214cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner new ReturnInst(TheCall, StubBB); // Return result of the call. 215cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner else 216cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner new ReturnInst(StubBB); // Just return void. 217cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner 218cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner // Finally, return the value returned by our nullary stub function. 219cc22e9f406cf21e3a2036bf6628ee7a5c850d42cChris Lattner return runFunction(Stub, std::vector<GenericValue>()); 220bd199fb1148b9e16c4e6f3d0ee386c2505a55b71Chris Lattner} 2214d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2224d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// runJITOnFunction - Run the FunctionPassManager full of 2234d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// just-in-time compilation passes on F, hopefully filling in 2244d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// GlobalAddress[F] with the address of F's machine code. 2254d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 2264d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid JIT::runJITOnFunction(Function *F) { 2274d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner static bool isAlreadyCodeGenerating = false; 2284d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!"); 22900b16889ab461b7ecef1c91ade101186b7f1fce2Jeff Cohen 230ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 2314d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2324d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // JIT the function 2334d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner isAlreadyCodeGenerating = true; 234ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer state.getPM(locked).run(*F); 2354d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner isAlreadyCodeGenerating = false; 236c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 237c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the function referred to a global variable that had not yet been 238c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // emitted, it allocates memory for the global, but doesn't emit it yet. Emit 239c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // all of these globals now. 240ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer while (!state.getPendingGlobals(locked).empty()) { 241ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer const GlobalVariable *GV = state.getPendingGlobals(locked).back(); 242ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer state.getPendingGlobals(locked).pop_back(); 243c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner EmitGlobalVariable(GV); 244c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 2454d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 2464d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2474d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// getPointerToFunction - This method is used to get the address of the 2484d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// specified function, compiling it if neccesary. 2494d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 2504d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid *JIT::getPointerToFunction(Function *F) { 251ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 252ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer 253c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (void *Addr = getPointerToGlobalIfAvailable(F)) 254c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Addr; // Check if function already code gen'd 2554d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2564d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner // Make sure we read in the function if it exists in this Module 257f976c856fcc5055f3fc7d9f070d72c2d027c1d9dMisha Brukman if (F->hasNotBeenReadFromBytecode()) 2580050ef831912eea2377c815bc59c09ed828f2684Chris Lattner try { 2590050ef831912eea2377c815bc59c09ed828f2684Chris Lattner MP->materializeFunction(F); 2600050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } catch ( std::string& errmsg ) { 2610050ef831912eea2377c815bc59c09ed828f2684Chris Lattner std::cerr << "Error reading function '" << F->getName() 2620050ef831912eea2377c815bc59c09ed828f2684Chris Lattner << "' from bytecode file: " << errmsg << "\n"; 2630050ef831912eea2377c815bc59c09ed828f2684Chris Lattner abort(); 2640050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } catch (...) { 2650050ef831912eea2377c815bc59c09ed828f2684Chris Lattner std::cerr << "Error reading function '" << F->getName() 2660050ef831912eea2377c815bc59c09ed828f2684Chris Lattner << "from bytecode file!\n"; 2670050ef831912eea2377c815bc59c09ed828f2684Chris Lattner abort(); 2680050ef831912eea2377c815bc59c09ed828f2684Chris Lattner } 2694d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 270c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (F->isExternal()) { 271c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToNamedFunction(F->getName()); 272c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(F, Addr); 273c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Addr; 274c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 2754d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 2764d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner runJITOnFunction(F); 277c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 278c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToGlobalIfAvailable(F); 2794d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(Addr && "Code generation didn't add function to GlobalAddress table!"); 2804d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner return Addr; 2814d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 2824d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 283c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// getOrEmitGlobalVariable - Return the address of the specified global 284c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// variable, possibly emitting it to memory if needed. This is used by the 285c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner/// Emitter. 286c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattnervoid *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) { 287ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer MutexGuard locked(lock); 288ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer 289c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Ptr = getPointerToGlobalIfAvailable(GV); 290c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (Ptr) return Ptr; 291c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 292c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the global is external, just remember the address. 293c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (GV->isExternal()) { 294df5a37efc997288da520ff4889443e3560d95387Reid Spencer Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName().c_str()); 295c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (Ptr == 0) { 296c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner std::cerr << "Could not resolve external global address: " 297c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner << GV->getName() << "\n"; 298c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner abort(); 299c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 300c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } else { 301c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If the global hasn't been emitted to memory yet, allocate space. We will 302c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // actually initialize the global after current function has finished 303c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // compilation. 304f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner const Type *GlobalType = GV->getType()->getElementType(); 305a69571c7991813c93cba64e88eced6899ce93d81Owen Anderson size_t S = getTargetData()->getTypeSize(GlobalType); 306a69571c7991813c93cba64e88eced6899ce93d81Owen Anderson size_t A = getTargetData()->getTypeAlignment(GlobalType); 307f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner if (A <= 8) { 308f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner Ptr = malloc(S); 309f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner } else { 310f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner // Allocate S+A bytes of memory, then use an aligned pointer within that 311f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner // space. 312f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner Ptr = malloc(S+A); 313f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner unsigned MisAligned = ((intptr_t)Ptr & (A-1)); 314f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner unsigned Offset = MisAligned ? (A-MisAligned) : 0; 315f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner 316f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner // Trim the tail off the memory block. 317f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner realloc(Ptr, S+Offset); 318f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner Ptr = (char*)Ptr + Offset; 319f5d438c1f0e0c0ed44475ab69f03d86a3c818c60Chris Lattner } 320ee448630bdf7eb6037fe2c50518d32010c433ca3Reid Spencer state.getPendingGlobals(locked).push_back(GV); 321c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner } 322c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(GV, Ptr); 323c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner return Ptr; 324c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner} 325c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 326c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 3274d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// recompileAndRelinkFunction - This method is used to force a function 3284d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// which has already been compiled, to be compiled again, possibly 3294d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// after it has been modified. Then the entry to the old copy is overwritten 3304d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// with a branch to the new copy. If there was no old copy, this acts 3314d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// just like JIT::getPointerToFunction(). 3324d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner/// 3334d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattnervoid *JIT::recompileAndRelinkFunction(Function *F) { 334c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *OldAddr = getPointerToGlobalIfAvailable(F); 3354d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 336c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // If it's not already compiled there is no reason to patch it up. 337c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner if (OldAddr == 0) { return getPointerToFunction(F); } 3384d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner 339c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Delete the old function mapping. 340c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner addGlobalMapping(F, 0); 341c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 342c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Recodegen the function 3434d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner runJITOnFunction(F); 344c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner 345c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner // Update state, forward the old function to the new function. 346c07ed1387503d25c0b93fcf617f69329d73fc589Chris Lattner void *Addr = getPointerToGlobalIfAvailable(F); 3474d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner assert(Addr && "Code generation didn't add function to GlobalAddress table!"); 3484d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner TJI.replaceMachineCodeForFunction(OldAddr, Addr); 3494d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner return Addr; 3504d326fa9bea5b80147edf14d1521fc41ce315275Chris Lattner} 351895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman 352895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman/// freeMachineCodeForFunction - release machine code memory for given Function 353895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman/// 354895eddfad43f848d5accce1789aa80be0db459d3Misha Brukmanvoid JIT::freeMachineCodeForFunction(Function *F) { 355895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman // currently a no-op 356895eddfad43f848d5accce1789aa80be0db459d3Misha Brukman} 357