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* Removed SparcEmitter.cpp; rolled into lib/Target/Sparc/SparcV9CodeEmitter.cpp

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* No more createX86Emitter() vs. createSparcEmitter() -- there can be only one
* As a result, the memory management semantics must be handled according to
  platform -- the parameters to mmap() are particularly sensitive to the host
  architecture.

llvm-svn: 6527
This commit is contained in:
Misha Brukman 2003-06-02 03:23:16 +00:00
parent c8c58138b6
commit 1c70c3f7a3
4 changed files with 23 additions and 260 deletions
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23
lib/ExecutionEngine/JIT/Emitter.cpp
View File

@ -55,7 +55,7 @@ namespace {
};
}
MachineCodeEmitter *VM::createX86Emitter(VM &V) {
MachineCodeEmitter *VM::createEmitter(VM &V) {
return new Emitter(V);
}
@ -67,8 +67,25 @@ MachineCodeEmitter *VM::createX86Emitter(VM &V) {
// 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);
#if defined(i386) || defined(__i386__) || defined(__x86__)
static const int fd = 0;
#elif defined(sparc) || defined(__sparc__) || defined(__sparcv9)
static const int fd = -1;
#else
// This is an unsupported architecture.
static const int fd = 0;
#endif
void *pa;
if (NumPages == 0) return 0;
static const long pageSize = sysconf (_SC_PAGESIZE);
pa = mmap(0, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_ANONYMOUS, fd, 0);
if (pa == MAP_FAILED) {
perror("mmap");
abort();
}
return pa;
}

8
lib/ExecutionEngine/JIT/JIT.cpp
View File

@ -43,7 +43,7 @@ ExecutionEngine *ExecutionEngine::createJIT(Module *M, unsigned Config) {
if (Arch == "x86") {
TargetMachineAllocator = allocateX86TargetMachine;
} else if (Arch == "sparc") {
//TargetMachineAllocator = allocateSparcTargetMachine;
TargetMachineAllocator = allocateSparcTargetMachine;
}
if (TargetMachineAllocator) {
@ -62,11 +62,7 @@ VM::VM(Module *M, TargetMachine *tm) : ExecutionEngine(M), TM(*tm) {
setTargetData(TM.getTargetData());
// Initialize MCE
if (Arch == "x86") {
MCE = createX86Emitter(*this);
} else if (Arch == "sparc") {
//MCE = createSparcEmitter(*this);
}
MCE = createEmitter(*this);
setupPassManager();
emitGlobals();

249
lib/ExecutionEngine/JIT/SparcEmitter.cpp
View File

@ -1,249 +0,0 @@
//===-- 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*, long> 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);
void* getMemory(unsigned NumPages);
};
}
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!
void* SparcEmitter::getMemory(unsigned NumPages) {
void *pa;
if (NumPages == 0) return 0;
static const long pageSize = sysconf (_SC_PAGESIZE);
pa = mmap(0, pageSize*NumPages, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
if (pa == MAP_FAILED) {
perror("mmap");
abort();
}
return pa;
}
void SparcEmitter::startFunction(MachineFunction &F) {
std::cerr << "Starting function " << F.getFunction()->getName() << "\n";
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) {
std::cerr << "Finishing function " << F.getFunction()->getName() << "\n";
ConstantPoolAddresses.clear();
// Re-write 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;
std::cerr << "attempting to resolve BB: " << i << "\n";
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 + (br target * 4), so undo that arithmetic here:
// Location is the target of the branch
// Ref is the location of the instruction, and hence the PC
unsigned branchTarget = (Location - (long)Ref) >> 2;
// Save the flags.
bool loBits32=false, hiBits32=false, loBits64=false, hiBits64=false;
if (op.opLoBits32()) { loBits32=true; }
if (op.opHiBits32()) { hiBits32=true; }
if (op.opLoBits64()) { loBits64=true; }
if (op.opHiBits64()) { hiBits64=true; }
MI->SetMachineOperandConst(ii, MachineOperand::MO_SignExtendedImmed,
branchTarget);
if (loBits32) { MI->setOperandLo32(ii); }
else if (hiBits32) { MI->setOperandHi32(ii); }
else if (loBits64) { MI->setOperandLo64(ii); }
else if (hiBits64) { MI->setOperandHi64(ii); }
std::cerr << "Rewrote BB ref: ";
unsigned fixedInstr = SparcV9CodeEmitter::getBinaryCodeForInstr(*MI);
*Ref = fixedInstr;
break;
}
}
}
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()] = (long)(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.
// Should be called by the emitter if its outputting a PCRelative disp
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;
}

3
lib/ExecutionEngine/JIT/VM.h
View File

@ -52,8 +52,7 @@ public:
void *getPointerToFunction(const Function *F);
private:
static MachineCodeEmitter *createX86Emitter(VM &V);
static MachineCodeEmitter *createSparcEmitter(VM &V);
static MachineCodeEmitter *createEmitter(VM &V);
void setupPassManager();
};