-//===-- ExecutionEngine.cpp - Common Implementation shared by EE's --------===//
+//===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file defines the common interface used by the various execution engine
// subclasses.
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "jit"
-#include "ExecutionEngine.h"
-#include "GenericValue.h"
-#include "llvm/DerivedTypes.h"
+#include "Interpreter/Interpreter.h"
+#include "JIT/JIT.h"
#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/IntrinsicLowering.h"
#include "llvm/Module.h"
+#include "llvm/ModuleProvider.h"
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/Target/TargetData.h"
#include "Support/Debug.h"
#include "Support/Statistic.h"
+#include "Support/DynamicLinker.h"
#include "Config/dlfcn.h"
-#include "JIT/VM.h"
-#include "Interpreter/Interpreter.h"
+using namespace llvm;
-Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
+namespace {
+ Statistic<> NumInitBytes("lli", "Number of bytes of global vars initialized");
+ Statistic<> NumGlobals ("lli", "Number of global vars initialized");
+}
+
+ExecutionEngine::ExecutionEngine(ModuleProvider *P) :
+ CurMod(*P->getModule()), MP(P) {
+ assert(P && "ModuleProvider is null?");
+}
+
+ExecutionEngine::ExecutionEngine(Module *M) : CurMod(*M), MP(0) {
+ assert(M && "Module is null?");
+}
+
+ExecutionEngine::~ExecutionEngine() {
+ delete MP;
+}
-ExecutionEngine *ExecutionEngine::create (Module *M, bool ForceInterpreter,
- bool TraceMode) {
+/// getGlobalValueAtAddress - Return the LLVM global value object that starts
+/// at the specified address.
+///
+const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
+ // If we haven't computed the reverse mapping yet, do so first.
+ if (GlobalAddressReverseMap.empty()) {
+ for (std::map<const GlobalValue*, void *>::iterator I =
+ GlobalAddressMap.begin(), E = GlobalAddressMap.end(); I != E; ++I)
+ GlobalAddressReverseMap.insert(std::make_pair(I->second, I->first));
+ }
+
+ std::map<void *, const GlobalValue*>::iterator I =
+ GlobalAddressReverseMap.find(Addr);
+ return I != GlobalAddressReverseMap.end() ? I->second : 0;
+}
+
+// CreateArgv - Turn a vector of strings into a nice argv style array of
+// pointers to null terminated strings.
+//
+static void *CreateArgv(ExecutionEngine *EE,
+ const std::vector<std::string> &InputArgv) {
+ unsigned PtrSize = EE->getTargetData().getPointerSize();
+ char *Result = new char[(InputArgv.size()+1)*PtrSize];
+
+ DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
+ const Type *SBytePtr = PointerType::get(Type::SByteTy);
+
+ for (unsigned i = 0; i != InputArgv.size(); ++i) {
+ unsigned Size = InputArgv[i].size()+1;
+ char *Dest = new char[Size];
+ DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
+
+ std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
+ Dest[Size-1] = 0;
+
+ // Endian safe: Result[i] = (PointerTy)Dest;
+ EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
+ SBytePtr);
+ }
+
+ // Null terminate it
+ EE->StoreValueToMemory(PTOGV(0),
+ (GenericValue*)(Result+InputArgv.size()*PtrSize),
+ SBytePtr);
+ return Result;
+}
+
+/// runFunctionAsMain - This is a helper function which wraps runFunction to
+/// handle the common task of starting up main with the specified argc, argv,
+/// and envp parameters.
+int ExecutionEngine::runFunctionAsMain(Function *Fn,
+ const std::vector<std::string> &argv,
+ const char * const * envp) {
+ std::vector<GenericValue> GVArgs;
+ GenericValue GVArgc;
+ GVArgc.IntVal = argv.size();
+ GVArgs.push_back(GVArgc); // Arg #0 = argc.
+ GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
+ assert(((char **)GVTOP(GVArgs[1]))[0] && "argv[0] was null after CreateArgv");
+
+ std::vector<std::string> EnvVars;
+ for (unsigned i = 0; envp[i]; ++i)
+ EnvVars.push_back(envp[i]);
+ GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
+ return runFunction(Fn, GVArgs).IntVal;
+}
+
+
+
+/// If possible, create a JIT, unless the caller specifically requests an
+/// Interpreter or there's an error. If even an Interpreter cannot be created,
+/// NULL is returned.
+///
+ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
+ bool ForceInterpreter,
+ IntrinsicLowering *IL) {
ExecutionEngine *EE = 0;
- // If there is nothing that is forcing us to use the interpreter, make a JIT.
- if (!ForceInterpreter && !TraceMode)
- EE = VM::create(M);
+ // Unless the interpreter was explicitly selected, try making a JIT.
+ if (!ForceInterpreter)
+ EE = JIT::create(MP, IL);
// If we can't make a JIT, make an interpreter instead.
- if (EE == 0)
- EE = Interpreter::create(M, TraceMode);
+ try {
+ if (EE == 0)
+ EE = Interpreter::create(MP->materializeModule(), IL);
+ } catch (...) {
+ EE = 0;
+ }
+
+ if (EE == 0) delete IL;
return EE;
}
-// getPointerToGlobal - This returns the address of the specified global
-// value. This may involve code generation if it's a function.
-//
+/// getPointerToGlobal - This returns the address of the specified global
+/// value. This may involve code generation if it's a function.
+///
void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
return getPointerToFunction(F);
- assert(GlobalAddress[GV] && "Global hasn't had an address allocated yet?");
- return GlobalAddress[GV];
+ assert(GlobalAddressMap[GV] && "Global hasn't had an address allocated yet?");
+ return GlobalAddressMap[GV];
}
+/// FIXME: document
+///
GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
GenericValue Result;
if (isa<ConstantPointerNull>(C)) {
Result.PointerVal = 0;
} else if (const ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)){
- Result = PTOGV(getPointerToGlobal(CPR->getValue()));
+ if (Function *F =
+ const_cast<Function*>(dyn_cast<Function>(CPR->getValue())))
+ Result = PTOGV(getPointerToFunctionOrStub(F));
+ else
+ Result = PTOGV(getOrEmitGlobalVariable(
+ cast<GlobalVariable>(CPR->getValue())));
} else {
assert(0 && "Unknown constant pointer type!");
return Result;
}
+/// FIXME: document
+///
void ExecutionEngine::StoreValueToMemory(GenericValue Val, GenericValue *Ptr,
- const Type *Ty) {
+ const Type *Ty) {
if (getTargetData().isLittleEndian()) {
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID:
}
}
+/// FIXME: document
+///
GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
const Type *Ty) {
GenericValue Result;
}
}
-void *ExecutionEngine::CreateArgv(const std::vector<std::string> &InputArgv) {
- if (getTargetData().getPointerSize() == 8) { // 64 bit target?
- PointerTy *Result = new PointerTy[InputArgv.size()+1];
- DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
-
- for (unsigned i = 0; i < InputArgv.size(); ++i) {
- unsigned Size = InputArgv[i].size()+1;
- char *Dest = new char[Size];
- DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
-
- copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
- Dest[Size-1] = 0;
-
- // Endian safe: Result[i] = (PointerTy)Dest;
- StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i), Type::LongTy);
- }
- Result[InputArgv.size()] = 0;
- return Result;
-
- } else { // 32 bit target?
- int *Result = new int[InputArgv.size()+1];
- DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
-
- for (unsigned i = 0; i < InputArgv.size(); ++i) {
- unsigned Size = InputArgv[i].size()+1;
- char *Dest = new char[Size];
- DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
-
- copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
- Dest[Size-1] = 0;
-
- // Endian safe: Result[i] = (PointerTy)Dest;
- StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i), Type::IntTy);
- }
- Result[InputArgv.size()] = 0; // null terminate it
- return Result;
- }
-}
-
/// EmitGlobals - Emit all of the global variables to memory, storing their
/// addresses into GlobalAddress. This must make sure to copy the contents of
/// their initializers into the memory.
// Allocate some memory for it!
unsigned Size = TD.getTypeSize(Ty);
- GlobalAddress[I] = new char[Size];
- NumInitBytes += Size;
+ addGlobalMapping(I, new char[Size]);
DEBUG(std::cerr << "Global '" << I->getName() << "' -> "
- << (void*)GlobalAddress[I] << "\n");
+ << getPointerToGlobal(I) << "\n");
} else {
- // On Sparc, RTLD_SELF is already defined and it's not zero
- // Linux/x86 wants to use a 0, other systems may differ
-#ifndef RTLD_SELF
-#define RTLD_SELF 0
-#endif
- // External variable reference, try to use dlsym to get a pointer to it in
- // the LLI image.
- if (void *SymAddr = dlsym(RTLD_SELF, I->getName().c_str()))
- GlobalAddress[I] = SymAddr;
+ // External variable reference. Try to use the dynamic loader to
+ // get a pointer to it.
+ if (void *SymAddr = GetAddressOfSymbol(I->getName().c_str()))
+ addGlobalMapping(I, SymAddr);
else {
std::cerr << "Could not resolve external global address: "
<< I->getName() << "\n";
for (Module::giterator I = getModule().gbegin(), E = getModule().gend();
I != E; ++I)
if (!I->isExternal())
- InitializeMemory(I->getInitializer(), GlobalAddress[I]);
+ EmitGlobalVariable(I);
}
+// EmitGlobalVariable - This method emits the specified global variable to the
+// address specified in GlobalAddresses, or allocates new memory if it's not
+// already in the map.
+void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
+ void *GA = getPointerToGlobalIfAvailable(GV);
+ const Type *ElTy = GV->getType()->getElementType();
+ if (GA == 0) {
+ // If it's not already specified, allocate memory for the global.
+ GA = new char[getTargetData().getTypeSize(ElTy)];
+ addGlobalMapping(GV, GA);
+ }
+
+ InitializeMemory(GV->getInitializer(), GA);
+ NumInitBytes += getTargetData().getTypeSize(ElTy);
+ ++NumGlobals;
+}
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