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91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
//===-- GlobalVars.cpp - Code to emit global variables to memory ----------===//
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//
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// This file contains the code to generate global variables to memory.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Constants.h"
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#include "llvm/Target/TargetMachine.h"
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#include "VM.h"
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/// EmitGlobals - Emit all of the global variables to memory, storing their
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/// addresses into GlobalAddress. This must make sure to copy the contents of
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/// their initializers into the memory.
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///
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void VM::emitGlobals() {
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const TargetData &TD = TM.getTargetData();
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// Loop over all of the global variables in the program, allocating the memory
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// to hold them.
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for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
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if (!I->isExternal()) {
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// Get the type of the global...
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const Type *Ty = I->getType()->getElementType();
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// Allocate some memory for it!
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GlobalAddress[I] = new char[TD.getTypeSize(Ty)];
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std::cerr << "Allocated global '" << I->getName()
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<< "' to addr 0x" << std::hex << GlobalAddress[I] << std::dec
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<< "\n";
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} else {
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assert(0 && "References to external globals not handled yet!");
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}
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// Now that all of the globals are set up in memory, loop through them all and
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// initialize their contents.
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for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
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if (!I->isExternal())
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emitConstantToMemory(I->getInitializer(), GlobalAddress[I]);
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}
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/// emitConstantToMemory - Use the specified LLVM constant to initialize the
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/// specified region of memory.
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///
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void VM::emitConstantToMemory(Constant *Init, void *Addr) {
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const TargetData &TD = TM.getTargetData();
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if (ConstantIntegral *CI = dyn_cast<ConstantIntegral>(Init)) {
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switch (CI->getType()->getPrimitiveID()) {
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case Type::BoolTyID:
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*(char*)Addr = cast<ConstantBool>(CI)->getValue();
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return;
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case Type::UByteTyID:
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*(unsigned char*)Addr = cast<ConstantUInt>(CI)->getValue();
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return;
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case Type::SByteTyID:
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*( signed char*)Addr = cast<ConstantSInt>(CI)->getValue();
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return;
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case Type::UShortTyID:
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*(unsigned short*)Addr = cast<ConstantUInt>(CI)->getValue();
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return;
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case Type::ShortTyID:
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*( signed short*)Addr = cast<ConstantSInt>(CI)->getValue();
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return;
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case Type::UIntTyID:
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*(unsigned int*)Addr = cast<ConstantUInt>(CI)->getValue();
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return;
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case Type::IntTyID:
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*( signed int*)Addr = cast<ConstantSInt>(CI)->getValue();
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return;
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case Type::ULongTyID:
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*(uint64_t*)Addr = cast<ConstantUInt>(CI)->getValue();
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return;
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case Type::LongTyID:
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*(int64_t*)Addr = cast<ConstantSInt>(CI)->getValue();
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return;
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default: break;
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}
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} else if (ConstantArray *CA = dyn_cast<ConstantArray>(Init)) {
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unsigned ElementSize = TD.getTypeSize(CA->getType()->getElementType());
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for (unsigned i = 0, e = CA->getType()->getNumElements(); i != e; ++i) {
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emitConstantToMemory(cast<Constant>(CA->getOperand(i)), Addr);
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Addr = (char*)Addr+ElementSize;
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}
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return;
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}
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assert(0 && "Don't know how to emit this constant to memory!");
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}
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