1 //===-- MCJIT.cpp - MC-based Just-in-Time Compiler --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 #include "MCJITMemoryManager.h"
12 #include "llvm/DerivedTypes.h"
13 #include "llvm/Function.h"
14 #include "llvm/ExecutionEngine/GenericValue.h"
15 #include "llvm/ExecutionEngine/MCJIT.h"
16 #include "llvm/ExecutionEngine/JITMemoryManager.h"
17 #include "llvm/MC/MCAsmInfo.h"
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Support/DynamicLibrary.h"
20 #include "llvm/Support/MemoryBuffer.h"
21 #include "llvm/Target/TargetData.h"
27 static struct RegisterJIT {
28 RegisterJIT() { MCJIT::Register(); }
33 extern "C" void LLVMLinkInMCJIT() {
36 ExecutionEngine *MCJIT::createJIT(Module *M,
37 std::string *ErrorStr,
38 JITMemoryManager *JMM,
39 CodeGenOpt::Level OptLevel,
44 const SmallVectorImpl<std::string>& MAttrs) {
45 // Try to register the program as a source of symbols to resolve against.
47 // FIXME: Don't do this here.
48 sys::DynamicLibrary::LoadLibraryPermanently(0, NULL);
50 // Pick a target either via -march or by guessing the native arch.
52 // FIXME: This should be lifted out of here, it isn't something which should
53 // be part of the JIT policy, rather the burden for this selection should be
55 TargetMachine *TM = MCJIT::selectTarget(M, MArch, MCPU, MAttrs, ErrorStr);
56 if (!TM || (ErrorStr && ErrorStr->length() > 0)) return 0;
57 TM->setCodeModel(CMM);
59 // If the target supports JIT code generation, create the JIT.
60 if (TargetJITInfo *TJ = TM->getJITInfo())
61 return new MCJIT(M, TM, *TJ, new MCJITMemoryManager(JMM), OptLevel,
65 *ErrorStr = "target does not support JIT code generation";
69 MCJIT::MCJIT(Module *m, TargetMachine *tm, TargetJITInfo &tji,
70 RTDyldMemoryManager *MM, CodeGenOpt::Level OptLevel,
71 bool AllocateGVsWithCode)
72 : ExecutionEngine(m), TM(tm), MemMgr(MM), M(m), OS(Buffer), Dyld(MM) {
74 PM.add(new TargetData(*TM->getTargetData()));
76 // Turn the machine code intermediate representation into bytes in memory
77 // that may be executed.
78 if (TM->addPassesToEmitMC(PM, Ctx, OS, CodeGenOpt::Default, false)) {
79 report_fatal_error("Target does not support MC emission!");
83 // FIXME: When we support multiple modules, we'll want to move the code
84 // gen and finalization out of the constructor here and do it more
85 // on-demand as part of getPointerToFunction().
87 // Flush the output buffer so the SmallVector gets its data.
90 // Load the object into the dynamic linker.
91 // FIXME: It would be nice to avoid making yet another copy.
92 MemoryBuffer *MB = MemoryBuffer::getMemBufferCopy(StringRef(Buffer.data(),
94 if (Dyld.loadObject(MB))
95 report_fatal_error(Dyld.getErrorString());
102 void *MCJIT::getPointerToBasicBlock(BasicBlock *BB) {
103 report_fatal_error("not yet implemented");
107 void *MCJIT::getPointerToFunction(Function *F) {
108 if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
109 bool AbortOnFailure = !F->hasExternalWeakLinkage();
110 void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
111 addGlobalMapping(F, Addr);
115 Twine Name = TM->getMCAsmInfo()->getGlobalPrefix() + F->getName();
116 return (void*)Dyld.getSymbolAddress(Name.str());
119 void *MCJIT::recompileAndRelinkFunction(Function *F) {
120 report_fatal_error("not yet implemented");
123 void MCJIT::freeMachineCodeForFunction(Function *F) {
124 report_fatal_error("not yet implemented");
127 GenericValue MCJIT::runFunction(Function *F,
128 const std::vector<GenericValue> &ArgValues) {
129 assert(F && "Function *F was null at entry to run()");
131 void *FPtr = getPointerToFunction(F);
132 assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
133 const FunctionType *FTy = F->getFunctionType();
134 const Type *RetTy = FTy->getReturnType();
136 assert((FTy->getNumParams() == ArgValues.size() ||
137 (FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
138 "Wrong number of arguments passed into function!");
139 assert(FTy->getNumParams() == ArgValues.size() &&
140 "This doesn't support passing arguments through varargs (yet)!");
142 // Handle some common cases first. These cases correspond to common `main'
144 if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
145 switch (ArgValues.size()) {
147 if (FTy->getParamType(0)->isIntegerTy(32) &&
148 FTy->getParamType(1)->isPointerTy() &&
149 FTy->getParamType(2)->isPointerTy()) {
150 int (*PF)(int, char **, const char **) =
151 (int(*)(int, char **, const char **))(intptr_t)FPtr;
153 // Call the function.
155 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
156 (char **)GVTOP(ArgValues[1]),
157 (const char **)GVTOP(ArgValues[2])));
162 if (FTy->getParamType(0)->isIntegerTy(32) &&
163 FTy->getParamType(1)->isPointerTy()) {
164 int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
166 // Call the function.
168 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
169 (char **)GVTOP(ArgValues[1])));
174 if (FTy->getNumParams() == 1 &&
175 FTy->getParamType(0)->isIntegerTy(32)) {
177 int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
178 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
185 // Handle cases where no arguments are passed first.
186 if (ArgValues.empty()) {
188 switch (RetTy->getTypeID()) {
189 default: llvm_unreachable("Unknown return type for function call!");
190 case Type::IntegerTyID: {
191 unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
193 rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
194 else if (BitWidth <= 8)
195 rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
196 else if (BitWidth <= 16)
197 rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
198 else if (BitWidth <= 32)
199 rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
200 else if (BitWidth <= 64)
201 rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
203 llvm_unreachable("Integer types > 64 bits not supported");
207 rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
209 case Type::FloatTyID:
210 rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
212 case Type::DoubleTyID:
213 rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
215 case Type::X86_FP80TyID:
216 case Type::FP128TyID:
217 case Type::PPC_FP128TyID:
218 llvm_unreachable("long double not supported yet");
220 case Type::PointerTyID:
221 return PTOGV(((void*(*)())(intptr_t)FPtr)());
225 assert("Full-featured argument passing not supported yet!");
226 return GenericValue();