Allow for specification of which JIT to run on the commandline.
`lli -march=x86' or `lli -march=sparc' will forcefully select the JIT even on a
different platform. Running lli without the -march option will select the JIT
for the platform that it's currently running on.
Pro: can test Sparc JIT (debug printing mode) on X86 -- faster to compile/link
LLVM source base to test changes.
Con: Linking lli on x86 now pulls in all the Sparc libs -> longer link time
(but X86 can bear it, right?)
In the future, perhaps this should be a ./configure option to enable/disable
target JITting...
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6360 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/JIT/SparcEmitter.cpp b/lib/ExecutionEngine/JIT/SparcEmitter.cpp
new file mode 100644
index 0000000..77f48b2
--- /dev/null
+++ b/lib/ExecutionEngine/JIT/SparcEmitter.cpp
@@ -0,0 +1,218 @@
+//===-- SparcEmitter.cpp - Write machine code to executable memory --------===//
+//
+// This file defines a MachineCodeEmitter object that is used by Jello to write
+// machine code to memory and remember where relocatable values lie.
+//
+//===----------------------------------------------------------------------===//
+
+#include "VM.h"
+#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Function.h"
+#include "Support/Statistic.h"
+// FIXME
+#include "../../../lib/Target/Sparc/SparcV9CodeEmitter.h"
+
+namespace {
+ Statistic<> NumBytes("jello", "Number of bytes of machine code compiled");
+
+ class SparcEmitter : public MachineCodeEmitter {
+ VM &TheVM;
+
+ unsigned char *CurBlock, *CurByte;
+
+ // When outputting a function stub in the context of some other function, we
+ // save CurBlock and CurByte here.
+ unsigned char *SavedCurBlock, *SavedCurByte;
+
+ std::vector<std::pair<BasicBlock*,
+ std::pair<unsigned*,MachineInstr*> > > BBRefs;
+ std::map<BasicBlock*, unsigned> BBLocations;
+ std::vector<void*> ConstantPoolAddresses;
+ public:
+ SparcEmitter(VM &vm) : TheVM(vm) {}
+
+ virtual void startFunction(MachineFunction &F);
+ virtual void finishFunction(MachineFunction &F);
+ virtual void emitConstantPool(MachineConstantPool *MCP);
+ virtual void startBasicBlock(MachineBasicBlock &BB);
+ virtual void startFunctionStub(const Function &F, unsigned StubSize);
+ virtual void* finishFunctionStub(const Function &F);
+ virtual void emitByte(unsigned char B);
+ virtual void emitPCRelativeDisp(Value *V);
+ virtual void emitGlobalAddress(GlobalValue *V, bool isPCRelative);
+ virtual void emitGlobalAddress(const std::string &Name, bool isPCRelative);
+ virtual void emitFunctionConstantValueAddress(unsigned ConstantNum,
+ int Offset);
+
+ virtual void saveBBreference(BasicBlock *BB, MachineInstr &MI);
+
+ private:
+ void emitAddress(void *Addr, bool isPCRelative);
+ };
+}
+
+MachineCodeEmitter *VM::createSparcEmitter(VM &V) {
+ return new SparcEmitter(V);
+}
+
+
+#define _POSIX_MAPPED_FILES
+#include <unistd.h>
+#include <sys/mman.h>
+
+// FIXME: This should be rewritten to support a real memory manager for
+// executable memory pages!
+static void *getMemory(unsigned NumPages) {
+ return mmap(0, 4096*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
+ MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
+}
+
+
+void SparcEmitter::startFunction(MachineFunction &F) {
+ CurBlock = (unsigned char *)getMemory(8);
+ CurByte = CurBlock; // Start writing at the beginning of the fn.
+ TheVM.addGlobalMapping(F.getFunction(), CurBlock);
+}
+
+void SparcEmitter::finishFunction(MachineFunction &F) {
+ ConstantPoolAddresses.clear();
+ for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
+ // Re-write branches to BasicBlocks for the entire function
+ unsigned Location = BBLocations[BBRefs[i].first];
+ unsigned *Ref = BBRefs[i].second.first;
+ MachineInstr *MI = BBRefs[i].second.second;
+ for (unsigned i=0, e = MI->getNumOperands(); i != e; ++i) {
+ MachineOperand &op = MI->getOperand(i);
+ if (op.isImmediate()) {
+ MI->SetMachineOperandConst(i, op.getType(), Location);
+ break;
+ }
+ }
+ unsigned fixedInstr = SparcV9CodeEmitter::getBinaryCodeForInstr(*MI);
+ *Ref = fixedInstr;
+ }
+ BBRefs.clear();
+ BBLocations.clear();
+
+ NumBytes += CurByte-CurBlock;
+
+ DEBUG(std::cerr << "Finished CodeGen of [0x" << std::hex
+ << (unsigned)(intptr_t)CurBlock
+ << std::dec << "] Function: " << F.getFunction()->getName()
+ << ": " << CurByte-CurBlock << " bytes of text\n");
+}
+
+void SparcEmitter::emitConstantPool(MachineConstantPool *MCP) {
+ const std::vector<Constant*> &Constants = MCP->getConstants();
+ for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
+ // For now we just allocate some memory on the heap, this can be
+ // dramatically improved.
+ const Type *Ty = ((Value*)Constants[i])->getType();
+ void *Addr = malloc(TheVM.getTargetData().getTypeSize(Ty));
+ TheVM.InitializeMemory(Constants[i], Addr);
+ ConstantPoolAddresses.push_back(Addr);
+ }
+}
+
+
+void SparcEmitter::startBasicBlock(MachineBasicBlock &BB) {
+ BBLocations[BB.getBasicBlock()] = (unsigned)(intptr_t)CurByte;
+}
+
+
+void SparcEmitter::startFunctionStub(const Function &F, unsigned StubSize) {
+ SavedCurBlock = CurBlock; SavedCurByte = CurByte;
+ // FIXME: this is a huge waste of memory.
+ CurBlock = (unsigned char *)getMemory((StubSize+4095)/4096);
+ CurByte = CurBlock; // Start writing at the beginning of the fn.
+}
+
+void *SparcEmitter::finishFunctionStub(const Function &F) {
+ NumBytes += CurByte-CurBlock;
+ DEBUG(std::cerr << "Finished CodeGen of [0x" << std::hex
+ << (unsigned)(intptr_t)CurBlock
+ << std::dec << "] Function stub for: " << F.getName()
+ << ": " << CurByte-CurBlock << " bytes of text\n");
+ std::swap(CurBlock, SavedCurBlock);
+ CurByte = SavedCurByte;
+ return SavedCurBlock;
+}
+
+void SparcEmitter::emitByte(unsigned char B) {
+ *CurByte++ = B; // Write the byte to memory
+}
+
+// BasicBlock -> pair<memloc, MachineInstr>
+// when the BB is emitted, machineinstr is modified with then-currbyte,
+// processed with MCE, and written out at memloc.
+void SparcEmitter::saveBBreference(BasicBlock *BB, MachineInstr &MI) {
+ BBRefs.push_back(std::make_pair(BB, std::make_pair((unsigned*)CurByte, &MI)));
+}
+
+
+// emitPCRelativeDisp - For functions, just output a displacement that will
+// cause a reference to the zero page, which will cause a seg-fault, causing
+// things to get resolved on demand. Keep track of these markers.
+//
+// For basic block references, keep track of where the references are so they
+// may be patched up when the basic block is defined.
+//
+// BasicBlock -> pair<memloc, MachineInstr>
+// when the BB is emitted, machineinstr is modified with then-currbyte,
+// processed with MCE, and written out at memloc.
+
+void SparcEmitter::emitPCRelativeDisp(Value *V) {
+#if 0
+ BasicBlock *BB = cast<BasicBlock>(V); // Keep track of reference...
+ BBRefs.push_back(std::make_pair(BB, (unsigned*)CurByte));
+ CurByte += 4;
+#endif
+}
+
+// emitAddress - Emit an address in either direct or PCRelative form...
+//
+void SparcEmitter::emitAddress(void *Addr, bool isPCRelative) {
+#if 0
+ if (isPCRelative) {
+ *(intptr_t*)CurByte = (intptr_t)Addr - (intptr_t)CurByte-4;
+ } else {
+ *(void**)CurByte = Addr;
+ }
+ CurByte += 4;
+#endif
+}
+
+void SparcEmitter::emitGlobalAddress(GlobalValue *V, bool isPCRelative) {
+ if (isPCRelative) { // must be a call, this is a major hack!
+ // Try looking up the function to see if it is already compiled!
+ if (void *Addr = TheVM.getPointerToGlobalIfAvailable(V)) {
+ emitAddress(Addr, isPCRelative);
+ } else { // Function has not yet been code generated!
+ TheVM.addFunctionRef(CurByte, cast<Function>(V));
+
+ // Delayed resolution...
+ emitAddress((void*)VM::CompilationCallback, isPCRelative);
+ }
+ } else {
+ emitAddress(TheVM.getPointerToGlobal(V), isPCRelative);
+ }
+}
+
+void SparcEmitter::emitGlobalAddress(const std::string &Name, bool isPCRelative)
+{
+#if 0
+ emitAddress(TheVM.getPointerToNamedFunction(Name), isPCRelative);
+#endif
+}
+
+void SparcEmitter::emitFunctionConstantValueAddress(unsigned ConstantNum,
+ int Offset) {
+ assert(ConstantNum < ConstantPoolAddresses.size() &&
+ "Invalid ConstantPoolIndex!");
+ *(void**)CurByte = (char*)ConstantPoolAddresses[ConstantNum]+Offset;
+ CurByte += 4;
+}