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,
42 // Try to register the program as a source of symbols to resolve against.
44 // FIXME: Don't do this here.
45 sys::DynamicLibrary::LoadLibraryPermanently(0, NULL);
47 // If the target supports JIT code generation, create the JIT.
48 if (TargetJITInfo *TJ = TM->getJITInfo())
49 return new MCJIT(M, TM, *TJ, new MCJITMemoryManager(JMM), OptLevel,
53 *ErrorStr = "target does not support JIT code generation";
57 MCJIT::MCJIT(Module *m, TargetMachine *tm, TargetJITInfo &tji,
58 RTDyldMemoryManager *MM, CodeGenOpt::Level OptLevel,
59 bool AllocateGVsWithCode)
60 : ExecutionEngine(m), TM(tm), MemMgr(MM), M(m), OS(Buffer), Dyld(MM) {
62 PM.add(new TargetData(*TM->getTargetData()));
64 // Turn the machine code intermediate representation into bytes in memory
65 // that may be executed.
66 if (TM->addPassesToEmitMC(PM, Ctx, OS, CodeGenOpt::Default, false)) {
67 report_fatal_error("Target does not support MC emission!");
71 // FIXME: When we support multiple modules, we'll want to move the code
72 // gen and finalization out of the constructor here and do it more
73 // on-demand as part of getPointerToFunction().
75 // Flush the output buffer so the SmallVector gets its data.
78 // Load the object into the dynamic linker.
79 // FIXME: It would be nice to avoid making yet another copy.
80 MemoryBuffer *MB = MemoryBuffer::getMemBufferCopy(StringRef(Buffer.data(),
82 if (Dyld.loadObject(MB))
83 report_fatal_error(Dyld.getErrorString());
84 // Resolve any relocations.
85 Dyld.resolveRelocations();
92 void *MCJIT::getPointerToBasicBlock(BasicBlock *BB) {
93 report_fatal_error("not yet implemented");
97 void *MCJIT::getPointerToFunction(Function *F) {
98 if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
99 bool AbortOnFailure = !F->hasExternalWeakLinkage();
100 void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
101 addGlobalMapping(F, Addr);
105 Twine Name = TM->getMCAsmInfo()->getGlobalPrefix() + F->getName();
106 return (void*)Dyld.getSymbolAddress(Name.str());
109 void *MCJIT::recompileAndRelinkFunction(Function *F) {
110 report_fatal_error("not yet implemented");
113 void MCJIT::freeMachineCodeForFunction(Function *F) {
114 report_fatal_error("not yet implemented");
117 GenericValue MCJIT::runFunction(Function *F,
118 const std::vector<GenericValue> &ArgValues) {
119 assert(F && "Function *F was null at entry to run()");
121 void *FPtr = getPointerToFunction(F);
122 assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
123 const FunctionType *FTy = F->getFunctionType();
124 const Type *RetTy = FTy->getReturnType();
126 assert((FTy->getNumParams() == ArgValues.size() ||
127 (FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
128 "Wrong number of arguments passed into function!");
129 assert(FTy->getNumParams() == ArgValues.size() &&
130 "This doesn't support passing arguments through varargs (yet)!");
132 // Handle some common cases first. These cases correspond to common `main'
134 if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
135 switch (ArgValues.size()) {
137 if (FTy->getParamType(0)->isIntegerTy(32) &&
138 FTy->getParamType(1)->isPointerTy() &&
139 FTy->getParamType(2)->isPointerTy()) {
140 int (*PF)(int, char **, const char **) =
141 (int(*)(int, char **, const char **))(intptr_t)FPtr;
143 // Call the function.
145 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
146 (char **)GVTOP(ArgValues[1]),
147 (const char **)GVTOP(ArgValues[2])));
152 if (FTy->getParamType(0)->isIntegerTy(32) &&
153 FTy->getParamType(1)->isPointerTy()) {
154 int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
156 // Call the function.
158 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
159 (char **)GVTOP(ArgValues[1])));
164 if (FTy->getNumParams() == 1 &&
165 FTy->getParamType(0)->isIntegerTy(32)) {
167 int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
168 rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
175 // Handle cases where no arguments are passed first.
176 if (ArgValues.empty()) {
178 switch (RetTy->getTypeID()) {
179 default: llvm_unreachable("Unknown return type for function call!");
180 case Type::IntegerTyID: {
181 unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
183 rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
184 else if (BitWidth <= 8)
185 rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
186 else if (BitWidth <= 16)
187 rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
188 else if (BitWidth <= 32)
189 rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
190 else if (BitWidth <= 64)
191 rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
193 llvm_unreachable("Integer types > 64 bits not supported");
197 rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
199 case Type::FloatTyID:
200 rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
202 case Type::DoubleTyID:
203 rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
205 case Type::X86_FP80TyID:
206 case Type::FP128TyID:
207 case Type::PPC_FP128TyID:
208 llvm_unreachable("long double not supported yet");
210 case Type::PointerTyID:
211 return PTOGV(((void*(*)())(intptr_t)FPtr)());
215 assert("Full-featured argument passing not supported yet!");
216 return GenericValue();