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Add support for new types of values
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5256 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -8,6 +8,8 @@
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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/CodeGen/MachineConstantPool.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Function.h"
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#include "Support/Statistic.h"
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@ -22,15 +24,22 @@ namespace {
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std::vector<std::pair<BasicBlock*, unsigned *> > BBRefs;
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std::map<BasicBlock*, unsigned> BBLocations;
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std::vector<void*> ConstantPoolAddresses;
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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 emitConstantPool(MachineConstantPool *MCP);
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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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virtual void emitGlobalAddress(GlobalValue *V, bool isPCRelative);
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virtual void emitGlobalAddress(const std::string &Name, bool isPCRelative);
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virtual void emitFunctionConstantValueAddress(unsigned ConstantNum,
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int Offset);
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private:
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void emitAddress(void *Addr, bool isPCRelative);
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};
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}
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@ -44,7 +53,7 @@ MachineCodeEmitter *VM::createEmitter(VM &V) {
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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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return mmap(0, 4096*8, PROT_READ|PROT_WRITE|PROT_EXEC,
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MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
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}
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@ -56,6 +65,7 @@ void Emitter::startFunction(MachineFunction &F) {
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}
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void Emitter::finishFunction(MachineFunction &F) {
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ConstantPoolAddresses.clear();
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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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@ -66,11 +76,24 @@ void Emitter::finishFunction(MachineFunction &F) {
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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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DEBUG(std::cerr << "Finished CodeGen of [0x" << 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::emitConstantPool(MachineConstantPool *MCP) {
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const std::vector<Constant*> &Constants = MCP->getConstants();
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for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
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// For now we just allocate some memory on the heap, this can be
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// dramatically improved.
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const Type *Ty = ((Value*)Constants[i])->getType();
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void *Addr = malloc(TheVM.getTargetData().getTypeSize(Ty));
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TheVM.InitializeMemory(Constants[i], Addr);
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ConstantPoolAddresses.push_back(Addr);
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}
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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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@ -89,19 +112,39 @@ void Emitter::emitByte(unsigned char B) {
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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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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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// emitAddress - Emit an address in either direct or PCRelative form...
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//
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void Emitter::emitAddress(void *Addr, bool isPCRelative) {
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if (isPCRelative) {
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*(unsigned*)CurByte = (unsigned)Addr - (unsigned)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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*(void**)CurByte = Addr;
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}
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CurByte += 4;
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}
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void Emitter::emitGlobalAddress(GlobalValue *V, bool isPCRelative) {
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if (isPCRelative) { // must be a call, this is a major hack!
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TheVM.addFunctionRef(CurByte, cast<Function>(V));
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emitAddress(0, isPCRelative); // Delayed resolution...
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} else {
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emitAddress(TheVM.getPointerToGlobal(V), isPCRelative);
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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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void Emitter::emitGlobalAddress(const std::string &Name, bool isPCRelative) {
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emitAddress(TheVM.getPointerToNamedFunction(Name), isPCRelative);
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}
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void Emitter::emitFunctionConstantValueAddress(unsigned ConstantNum,
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int Offset) {
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assert(ConstantNum < ConstantPoolAddresses.size() &&
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"Invalid ConstantPoolIndex!");
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*(void**)CurByte = (char*)ConstantPoolAddresses[ConstantNum]+Offset;
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CurByte += 4;
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}
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