mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-14 16:33:28 +00:00
Jello is now part of LLI
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5133 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
0eb172cc4a
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a3b58e8e1b
@ -1,62 +0,0 @@
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//===-- Callback.cpp - Trap handler for function resolution ---------------===//
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//
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// This file defines the SIGSEGV handler which is invoked when a reference to a
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// non-codegen'd function is found.
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//
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//===----------------------------------------------------------------------===//
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#include "VM.h"
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#include "Support/Statistic.h"
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#include <signal.h>
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#include <ucontext.h>
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#include <iostream>
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static VM *TheVM = 0;
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static void TrapHandler(int TN, siginfo_t *SI, ucontext_t *ucp) {
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assert(TN == SIGSEGV && "Should be SIGSEGV!");
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#ifdef REG_EIP /* this code does not compile on Sparc! */
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if (SI->si_code != SEGV_MAPERR || SI->si_addr != 0 ||
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ucp->uc_mcontext.gregs[REG_EIP] != 0) {
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std::cerr << "Bad SEGV encountered!\n";
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abort();
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}
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// The call instruction should have pushed the return value onto the stack...
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unsigned RefAddr = *(unsigned*)ucp->uc_mcontext.gregs[REG_ESP];
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RefAddr -= 4; // Backtrack to the reference itself...
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DEBUG(std::cerr << "In SEGV handler! Addr=0x" << std::hex << RefAddr
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<< " ESP=0x" << ucp->uc_mcontext.gregs[REG_ESP] << std::dec
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<< ": Resolving call to function: "
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<< TheVM->getFunctionReferencedName((void*)RefAddr) << "\n");
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// Sanity check to make sure this really is a call instruction...
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assert(((unsigned char*)RefAddr)[-1] == 0xE8 && "Not a call instr!");
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unsigned NewVal = (unsigned)TheVM->resolveFunctionReference((void*)RefAddr);
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// Rewrite the call target... so that we don't fault every time we execute
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// the call.
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*(unsigned*)RefAddr = NewVal-RefAddr-4;
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// Change the instruction pointer to be the real target of the call...
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ucp->uc_mcontext.gregs[REG_EIP] = NewVal;
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#endif
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}
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void VM::registerCallback() {
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TheVM = this;
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// Register the signal handler...
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struct sigaction SA;
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SA.sa_sigaction = (void (*)(int, siginfo_t*, void*))TrapHandler;
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sigfillset(&SA.sa_mask); // Block all signals while codegen'ing
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SA.sa_flags = SA_NOCLDSTOP|SA_SIGINFO; // Get siginfo
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sigaction(SIGSEGV, &SA, 0); // Install the handler
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}
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@ -1,107 +0,0 @@
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//===-- Emitter.cpp - Write machine code to executable memory -------------===//
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//
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// This file defines a MachineCodeEmitter object that is used by Jello to write
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// machine code to memory and remember where relocatable values lie.
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//
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//===----------------------------------------------------------------------===//
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#include "VM.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/Function.h"
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#include "Support/Statistic.h"
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namespace {
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Statistic<> NumBytes("jello", "Number of bytes of machine code compiled");
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class Emitter : public MachineCodeEmitter {
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VM &TheVM;
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unsigned char *CurBlock;
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unsigned char *CurByte;
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std::vector<std::pair<BasicBlock*, unsigned *> > BBRefs;
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std::map<BasicBlock*, unsigned> BBLocations;
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public:
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Emitter(VM &vm) : TheVM(vm) {}
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virtual void startFunction(MachineFunction &F);
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virtual void finishFunction(MachineFunction &F);
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virtual void startBasicBlock(MachineBasicBlock &BB);
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virtual void emitByte(unsigned char B);
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virtual void emitPCRelativeDisp(Value *V);
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virtual void emitGlobalAddress(GlobalValue *V);
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};
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}
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MachineCodeEmitter *VM::createEmitter(VM &V) {
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return new Emitter(V);
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}
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#define _POSIX_MAPPED_FILES
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#include <unistd.h>
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#include <sys/mman.h>
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static void *getMemory() {
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return mmap(0, 4096*2, PROT_READ|PROT_WRITE|PROT_EXEC,
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MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
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}
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void Emitter::startFunction(MachineFunction &F) {
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CurBlock = (unsigned char *)getMemory();
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CurByte = CurBlock; // Start writing at the beginning of the fn.
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TheVM.addGlobalMapping(F.getFunction(), CurBlock);
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}
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void Emitter::finishFunction(MachineFunction &F) {
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for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
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unsigned Location = BBLocations[BBRefs[i].first];
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unsigned *Ref = BBRefs[i].second;
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*Ref = Location-(unsigned)Ref-4;
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}
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BBRefs.clear();
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BBLocations.clear();
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NumBytes += CurByte-CurBlock;
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DEBUG(std::cerr << "Finished CodeGen of [" << std::hex << (unsigned)CurBlock
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<< std::dec << "] Function: " << F.getFunction()->getName()
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<< ": " << CurByte-CurBlock << " bytes of text\n");
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}
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void Emitter::startBasicBlock(MachineBasicBlock &BB) {
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BBLocations[BB.getBasicBlock()] = (unsigned)CurByte;
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}
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void Emitter::emitByte(unsigned char B) {
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*CurByte++ = B; // Write the byte to memory
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}
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// emitPCRelativeDisp - For functions, just output a displacement that will
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// cause a reference to the zero page, which will cause a seg-fault, causing
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// things to get resolved on demand. Keep track of these markers.
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//
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// For basic block references, keep track of where the references are so they
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// may be patched up when the basic block is defined.
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//
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void Emitter::emitPCRelativeDisp(Value *V) {
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if (Function *F = dyn_cast<Function>(V)) {
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TheVM.addFunctionRef(CurByte, F);
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unsigned ZeroAddr = -(unsigned)CurByte-4; // Calculate displacement to null
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*(unsigned*)CurByte = ZeroAddr; // 4 byte offset
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CurByte += 4;
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} else {
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BasicBlock *BB = cast<BasicBlock>(V); // Keep track of reference...
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BBRefs.push_back(std::make_pair(BB, (unsigned*)CurByte));
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CurByte += 4;
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}
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}
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void Emitter::emitGlobalAddress(GlobalValue *V) {
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*(void**)CurByte = TheVM.getPointerToGlobal(V);
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CurByte += 4;
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}
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//===-- 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 "Support/Statistic.h"
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#include "VM.h"
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#include <iostream>
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Statistic<> NumInitBytes("jello", "Number of bytes of data area initialized");
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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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DEBUG(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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NumInitBytes += TD.getTypeSize (Init->getType ());
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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 (ConstantFP *CF = dyn_cast <ConstantFP> (Init)) {
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switch (CF->getType ()->getPrimitiveID ()) {
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case Type::FloatTyID:
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*(float*)Addr = CF->getValue ();
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return;
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case Type::DoubleTyID:
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*(double*)Addr = CF->getValue ();
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return;
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default: break;
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}
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} else if (ConstantPointerNull *CP = dyn_cast <ConstantPointerNull> (Init)) {
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// Fill the space with a NULL pointer.
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*(void **)Addr = NULL;
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return;
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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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std::cerr << "Offending constant: " << Init << "\n";
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assert(0 && "Don't know how to emit this constant to memory!");
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}
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@ -1,10 +0,0 @@
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LEVEL = ../..
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TOOLNAME = jello
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USEDLIBS = bcreader vmcore codegen x86 support.a target.a scalaropts.a
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# Have gcc tell the linker to export symbols from the program so that
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# dynamically loaded modules can be linked against them.
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#
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TOOLLINKOPTS = -ldl
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include $(LEVEL)/Makefile.common
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//===-- jello.cpp - LLVM Just in Time Compiler ----------------------------===//
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//
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// This tool implements a just-in-time compiler for LLVM, allowing direct
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// execution of LLVM bytecode in an efficient manner.
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//
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//===----------------------------------------------------------------------===//
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#include "VM.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/Function.h"
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#include <dlfcn.h> // dlsym access
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VM::~VM() {
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delete MCE;
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}
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/// setupPassManager - Initialize the VM PassManager object with all of the
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/// passes needed for the target to generate code.
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///
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void VM::setupPassManager() {
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// Compile LLVM Code down to machine code in the intermediate representation
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if (TM.addPassesToJITCompile(PM)) {
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std::cerr << ExeName << ": target '" << TM.getName()
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<< "' doesn't support JIT compilation!\n";
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abort();
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}
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// Turn the machine code intermediate representation into bytes in memory that
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// may be executed.
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//
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if (TM.addPassesToEmitMachineCode(PM, *MCE)) {
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std::cerr << ExeName << ": target '" << TM.getName()
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<< "' doesn't support machine code emission!\n";
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abort();
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}
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}
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int VM::run(Function *F) {
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int(*PF)(int, char**) = (int(*)(int, char**))getPointerToFunction(F);
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assert(PF != 0 && "Null pointer to function?");
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unsigned NumArgs = 0;
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for (; Argv[NumArgs]; ++NumArgs)
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;
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return PF(NumArgs, Argv);
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}
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void *VM::resolveFunctionReference(void *RefAddr) {
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Function *F = FunctionRefs[RefAddr];
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assert(F && "Reference address not known!");
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void *Addr = getPointerToFunction(F);
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assert(Addr && "Pointer to function unknown!");
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FunctionRefs.erase(RefAddr);
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return Addr;
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}
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const std::string &VM::getFunctionReferencedName(void *RefAddr) {
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return FunctionRefs[RefAddr]->getName();
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}
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// getPointerToGlobal - This returns the address of the specified global
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// value. This may involve code generation if it's a function.
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//
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void *VM::getPointerToGlobal(GlobalValue *GV) {
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if (Function *F = dyn_cast<Function>(GV))
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return getPointerToFunction(F);
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assert(GlobalAddress[GV] && "Global hasn't had an address allocated yet?");
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return GlobalAddress[GV];
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}
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static void NoopFn() {}
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/// getPointerToFunction - This method is used to get the address of the
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/// specified function, compiling it if neccesary.
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///
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void *VM::getPointerToFunction(Function *F) {
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void *&Addr = GlobalAddress[F]; // Function already code gen'd
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if (Addr) return Addr;
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if (F->isExternal()) {
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// If it's an external function, look it up in the process image...
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void *Ptr = dlsym(0, F->getName().c_str());
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if (Ptr == 0) {
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std::cerr << "WARNING: Cannot resolve fn '" << F->getName()
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<< "' using a dummy noop function instead!\n";
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Ptr = (void*)NoopFn;
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}
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return Addr = Ptr;
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}
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// JIT all of the functions in the module. Eventually this will JIT functions
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// on demand. This has the effect of populating all of the non-external
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// functions into the GlobalAddress table.
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PM.run(M);
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assert(Addr && "Code generation didn't add function to GlobalAddress table!");
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return Addr;
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}
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@ -1,79 +0,0 @@
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//===-- VM.h - Definitions for Virtual Machine ------------------*- C++ -*-===//
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//
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// This file defines the top level Virtual Machine data structure.
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//
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//===----------------------------------------------------------------------===//
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#ifndef VM_H
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#define VM_H
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#include "llvm/PassManager.h"
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#include <string>
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#include <map>
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#include <vector>
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class Function;
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class GlobalValue;
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class Constant;
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class TargetMachine;
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class MachineCodeEmitter;
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class VM {
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std::string ExeName;
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Module &M; // The LLVM program we are running
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TargetMachine &TM; // The current target we are compiling to
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PassManager PM; // Passes to compile a function
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MachineCodeEmitter *MCE; // MCE object
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char **Argv;
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// GlobalAddress - A mapping between LLVM values and their native code
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// generated versions...
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std::map<const GlobalValue*, void *> GlobalAddress;
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// FunctionRefs - A mapping between addresses that refer to unresolved
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// functions and the LLVM function object itself. This is used by the fault
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// handler to lazily patch up references...
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//
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std::map<void*, Function*> FunctionRefs;
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||||
public:
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VM(const std::string &name, char **AV, Module &m, TargetMachine &tm)
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: ExeName(name), M(m), TM(tm), Argv(AV) {
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MCE = createEmitter(*this); // Initialize MCE
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||||
setupPassManager();
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registerCallback();
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emitGlobals();
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}
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~VM();
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||||
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int run(Function *F);
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||||
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void addGlobalMapping(const Function *F, void *Addr) {
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void *&CurVal = GlobalAddress[(const GlobalValue*)F];
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assert(CurVal == 0 && "GlobalMapping already established!");
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CurVal = Addr;
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||||
}
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||||
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||||
void addFunctionRef(void *Ref, Function *F) {
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FunctionRefs[Ref] = F;
|
||||
}
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||||
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||||
const std::string &getFunctionReferencedName(void *RefAddr);
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||||
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||||
void *resolveFunctionReference(void *RefAddr);
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||||
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||||
// getPointerToGlobal - This returns the address of the specified global
|
||||
// value. This may involve code generation if it's a function.
|
||||
//
|
||||
void *getPointerToGlobal(GlobalValue *GV);
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private:
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static MachineCodeEmitter *createEmitter(VM &V);
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void setupPassManager();
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void *getPointerToFunction(Function *F);
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void registerCallback();
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void emitGlobals();
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void emitConstantToMemory(Constant *Init, void *Addr);
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};
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#endif
|
@ -1,70 +0,0 @@
|
||||
//===-- jello.cpp - LLVM Just in Time Compiler ----------------------------===//
|
||||
//
|
||||
// This tool implements a just-in-time compiler for LLVM, allowing direct
|
||||
// execution of LLVM bytecode in an efficient manner.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "llvm/Module.h"
|
||||
#include "llvm/Bytecode/Reader.h"
|
||||
#include "llvm/Target/TargetMachine.h"
|
||||
#include "llvm/Target/TargetMachineImpls.h"
|
||||
#include "Support/CommandLine.h"
|
||||
#include "VM.h"
|
||||
#include <memory>
|
||||
|
||||
namespace {
|
||||
cl::opt<std::string>
|
||||
InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
|
||||
|
||||
cl::list<std::string>
|
||||
InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
|
||||
|
||||
cl::opt<std::string>
|
||||
MainFunction("f", cl::desc("Function to execute"), cl::init("main"),
|
||||
cl::value_desc("function name"));
|
||||
}
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// main Driver function
|
||||
//
|
||||
int main(int argc, char **argv) {
|
||||
cl::ParseCommandLineOptions(argc, argv, " llvm just in time compiler\n");
|
||||
|
||||
// Allocate a target... in the future this will be controllable on the
|
||||
// command line.
|
||||
std::auto_ptr<TargetMachine> Target(
|
||||
allocateX86TargetMachine(TM::PtrSize64 | TM::BigEndian));
|
||||
assert(Target.get() && "Could not allocate target machine!");
|
||||
|
||||
// Parse the input bytecode file...
|
||||
std::string ErrorMsg;
|
||||
std::auto_ptr<Module> M(ParseBytecodeFile(InputFile, &ErrorMsg));
|
||||
if (M.get() == 0) {
|
||||
std::cerr << argv[0] << ": bytecode '" << InputFile
|
||||
<< "' didn't read correctly: << " << ErrorMsg << "\n";
|
||||
return 1;
|
||||
}
|
||||
|
||||
// Build an argv vector...
|
||||
InputArgv.insert(InputArgv.begin(), InputFile);
|
||||
char **Argv = new char*[InputArgv.size()+1];
|
||||
for (unsigned i = 0, e = InputArgv.size(); i != e; ++i) {
|
||||
Argv[i] = new char[InputArgv[i].size()+1];
|
||||
std::copy(InputArgv[i].begin(), InputArgv[i].end(), Argv[i]);
|
||||
Argv[i][InputArgv[i].size()] = 0;
|
||||
}
|
||||
Argv[InputArgv.size()] = 0;
|
||||
|
||||
// Create the virtual machine object...
|
||||
VM TheVM(argv[0], Argv, *M.get(), *Target.get());
|
||||
|
||||
Function *F = M.get()->getNamedFunction(MainFunction);
|
||||
if (F == 0) {
|
||||
std::cerr << "Could not find function '" << MainFunction <<"' in module!\n";
|
||||
return 1;
|
||||
}
|
||||
|
||||
// Run the virtual machine...
|
||||
return TheVM.run(F);
|
||||
}
|
Loading…
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Reference in New Issue
Block a user