* Add baseline structural JIT code, but disable the JIT to allow llvm-gcc builds
- Support added for functions, basic blocks, constant pool, constants,
registers, and some basic support for globals, all untested
* Turn assert()s into abort()s so that unimplemented functions fail in release
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17143 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/SparcV8/SparcV8CodeEmitter.cpp b/lib/Target/SparcV8/SparcV8CodeEmitter.cpp
index e1c1c06..2e43c43 100644
--- a/lib/Target/SparcV8/SparcV8CodeEmitter.cpp
+++ b/lib/Target/SparcV8/SparcV8CodeEmitter.cpp
@@ -10,10 +10,64 @@
//
//===----------------------------------------------------------------------===//
+#include "SparcV8.h"
#include "SparcV8TargetMachine.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/MachineCodeEmitter.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/Debug.h"
+#include <cstdlib>
+#include <map>
+#include <vector>
namespace llvm {
+namespace {
+ class SparcV8CodeEmitter : public MachineFunctionPass {
+ TargetMachine &TM;
+ MachineCodeEmitter &MCE;
+
+ /// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
+ ///
+ int64_t getMachineOpValue(MachineInstr &MI, MachineOperand &MO);
+
+ // Tracks which instruction references which BasicBlock
+ std::vector<std::pair<const BasicBlock*,
+ std::pair<unsigned*,MachineInstr*> > > BBRefs;
+ // Tracks where each BasicBlock starts
+ std::map<const BasicBlock*, long> BBLocations;
+
+ public:
+ SparcV8CodeEmitter(TargetMachine &T, MachineCodeEmitter &M)
+ : TM(T), MCE(M) {}
+
+ const char *getPassName() const { return "SparcV8 Machine Code Emitter"; }
+
+ /// runOnMachineFunction - emits the given MachineFunction to memory
+ ///
+ bool runOnMachineFunction(MachineFunction &MF);
+
+ /// emitBasicBlock - emits the given MachineBasicBlock to memory
+ ///
+ void emitBasicBlock(MachineBasicBlock &MBB);
+
+ /// emitWord - write a 32-bit word to memory at the current PC
+ ///
+ void emitWord(unsigned w) { MCE.emitWord(w); }
+
+ /// getValueBit - return the particular bit of Val
+ ///
+ unsigned getValueBit(int64_t Val, unsigned bit) { return (Val >> bit) & 1; }
+
+ /// getBinaryCodeForInstr - This function, generated by the
+ /// CodeEmitterGenerator using TableGen, produces the binary encoding for
+ /// machine instructions.
+ ///
+ unsigned getBinaryCodeForInstr(MachineInstr &MI);
+ };
+}
+
/// addPassesToEmitMachineCode - Add passes to the specified pass manager to get
/// machine code emitted. This uses a MachineCodeEmitter object to handle
/// actually outputting the machine code and resolving things like the address
@@ -22,22 +76,135 @@
///
bool SparcV8TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
MachineCodeEmitter &MCE) {
+ // Keep as `true' until this is a functional JIT to allow llvm-gcc to build
return true;
- // It should go something like this:
- // PM.add(new Emitter(MCE)); // Machine code emitter pass for SparcV8
- // Delete machine code for this function after emitting it:
- // PM.add(createMachineCodeDeleter());
+
+ // Machine code emitter pass for SparcV8
+ PM.add(new SparcV8CodeEmitter(*this, MCE));
+ // Delete machine code for this function after emitting it
+ PM.add(createMachineCodeDeleter());
+ return false;
+}
+
+bool SparcV8CodeEmitter::runOnMachineFunction(MachineFunction &MF) {
+ MCE.startFunction(MF);
+ MCE.emitConstantPool(MF.getConstantPool());
+ for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
+ emitBasicBlock(*I);
+ MCE.finishFunction(MF);
+
+ // Resolve branches to BasicBlocks for the entire function
+ for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
+ long Location = BBLocations[BBRefs[i].first];
+ unsigned *Ref = BBRefs[i].second.first;
+ MachineInstr *MI = BBRefs[i].second.second;
+ DEBUG(std::cerr << "Fixup @ " << std::hex << Ref << " to 0x" << Location
+ << " in instr: " << std::dec << *MI);
+ for (unsigned ii = 0, ee = MI->getNumOperands(); ii != ee; ++ii) {
+ MachineOperand &op = MI->getOperand(ii);
+ if (op.isPCRelativeDisp()) {
+ // the instruction's branch target is made such that it branches to
+ // PC + (branchTarget * 4), so undo that arithmetic here:
+ // Location is the target of the branch
+ // Ref is the location of the instruction, and hence the PC
+ int64_t branchTarget = (Location - (long)Ref) >> 2;
+ MI->SetMachineOperandConst(ii, MachineOperand::MO_SignExtendedImmed,
+ branchTarget);
+ unsigned fixedInstr = SparcV8CodeEmitter::getBinaryCodeForInstr(*MI);
+ MCE.emitWordAt(fixedInstr, Ref);
+ break;
+ }
+ }
+ }
+ BBRefs.clear();
+ BBLocations.clear();
+
+ return false;
+}
+
+void SparcV8CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
+ for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
+ emitWord(getBinaryCodeForInstr(*I));
+}
+
+int64_t SparcV8CodeEmitter::getMachineOpValue(MachineInstr &MI,
+ MachineOperand &MO) {
+ int64_t rv = 0; // Return value; defaults to 0 for unhandled cases
+ // or things that get fixed up later by the JIT.
+ if (MO.isPCRelativeDisp()) {
+ std::cerr << "SparcV8CodeEmitter: PC-relative disp unhandled\n";
+ abort();
+ } else if (MO.isRegister()) {
+ rv = MO.getReg();
+ } else if (MO.isImmediate()) {
+ rv = MO.getImmedValue();
+ } else if (MO.isGlobalAddress()) {
+ GlobalValue *GV = MO.getGlobal();
+ if (MO.isPCRelative()) { // Global variable reference
+ if (void *Addr = (void*)(intptr_t)MCE.getGlobalValueAddress(GV)) {
+ intptr_t CurrPC = MCE.getCurrentPCValue();
+ return (int64_t) (((long)Addr - (long)CurrPC) >> 2);
+ } else {
+ std::cerr << "Unhandled pc-relative global value: " << GV << "\n";
+ abort();
+ }
+ } else { // Function reference
+ if (!(rv = (intptr_t)MCE.getGlobalValueAddress(GV))) {
+ if (Function *F = dyn_cast<Function>(GV)) {
+ std::cerr << "SparcV8CodeEmitter error: no lazy fn resolution yet!\n";
+ abort();
+#if 0
+ // Function has not yet been code generated!
+ TheJITResolver->addFunctionReference(MCE.getCurrentPCValue(),
+ cast<Function>(GV));
+ // Delayed resolution...
+ return (intptr_t)TheJITResolver->getLazyResolver(cast<Function>(GV));
+#endif
+ } else {
+ std::cerr << "Unhandled global value: " << GV << "\n";
+ abort();
+ }
+ }
+ }
+ } else if (MO.isMachineBasicBlock()) {
+ const BasicBlock *BB = MO.getMachineBasicBlock()->getBasicBlock();
+ unsigned* CurrPC = (unsigned*)(intptr_t)MCE.getCurrentPCValue();
+ BBRefs.push_back(std::make_pair(BB, std::make_pair(CurrPC, &MI)));
+ } else if (MO.isExternalSymbol()) {
+ } else if (MO.isConstantPoolIndex()) {
+ unsigned index = MO.getConstantPoolIndex();
+ rv = MCE.getConstantPoolEntryAddress(index);
+ } else if (MO.isFrameIndex()) {
+ std::cerr << "SparcV8CodeEmitter: error: Frame index unhandled!\n";
+ abort();
+ } else {
+ std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";
+ abort();
+ }
+
+ // Adjust for special meaning of operands in some instructions
+ unsigned Opcode = MI.getOpcode();
+ if (Opcode == V8::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
+ rv &= 0x03ff;
+ } else if (Opcode == V8::ORri &&!MO.isRegister() &&!MO.isImmediate()) {
+ rv = (rv >> 10) & 0x03fffff;
+ }
+
+ return rv;
}
void *SparcV8JITInfo::getJITStubForFunction(Function *F,
MachineCodeEmitter &MCE) {
- assert (0 && "SparcV8JITInfo::getJITStubForFunction not implemented");
+ std::cerr << "SparcV8JITInfo::getJITStubForFunction not implemented!\n";
+ abort();
return 0;
}
-void SparcV8JITInfo::replaceMachineCodeForFunction (void *Old, void *New) {
- assert (0 && "SparcV8JITInfo::replaceMachineCodeForFunction not implemented");
+void SparcV8JITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
+ std::cerr << "SparcV8JITInfo::replaceMachineCodeForFunction not implemented!";
+ abort();
}
-} // end llvm namespace
+#include "SparcV8GenCodeEmitter.inc"
+} // end llvm namespace