+++ /dev/null
-//===-- Callback.cpp - Trap handler for function resolution ---------------===//
-//
-// This file defines the handler which is invoked when a reference to a
-// non-codegen'd function is found. This file defines target specific code
-// which is used by the JIT.
-//
-//===----------------------------------------------------------------------===//
-
-#include "VM.h"
-#include "Support/Statistic.h"
-#include "llvm/CodeGen/MachineCodeEmitter.h"
-#include <iostream>
-
-static VM *TheVM = 0;
-
-// CompilationCallback - Invoked the first time that a call site is found,
-// which causes lazy compilation of the target function.
-//
-void VM::CompilationCallback() {
-#if defined(i386) || defined(__i386__) || defined(__x86__)
- unsigned *StackPtr = (unsigned*)__builtin_frame_address(0);
- unsigned RetAddr = (unsigned)__builtin_return_address(0);
-
- assert(StackPtr[1] == RetAddr &&
- "Could not find return address on the stack!");
- bool isStub = ((unsigned char*)RetAddr)[0] == 0xCD; // Interrupt marker?
-
- // The call instruction should have pushed the return value onto the stack...
- RetAddr -= 4; // Backtrack to the reference itself...
-
- DEBUG(std::cerr << "In callback! Addr=0x" << std::hex << RetAddr
- << " ESP=0x" << (unsigned)StackPtr << std::dec
- << ": Resolving call to function: "
- << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n");
-
- // Sanity check to make sure this really is a call instruction...
- assert(((unsigned char*)RetAddr)[-1] == 0xE8 && "Not a call instr!");
-
- unsigned NewVal = (unsigned)TheVM->resolveFunctionReference((void*)RetAddr);
-
- // Rewrite the call target... so that we don't fault every time we execute
- // the call.
- *(unsigned*)RetAddr = NewVal-RetAddr-4;
-
- if (isStub) {
- // If this is a stub, rewrite the call into an unconditional branch
- // instruction so that two return addresses are not pushed onto the stack
- // when the requested function finally gets called. This also makes the
- // 0xCD byte (interrupt) dead, so the marker doesn't effect anything.
- ((unsigned char*)RetAddr)[-1] = 0xE9;
- }
-
- // Change the return address to reexecute the call instruction...
- StackPtr[1] -= 5;
-#else
- abort();
-#endif
-}
-
-/// emitStubForFunction - This virtual method is used by the JIT when it needs
-/// to emit the address of a function for a function whose code has not yet
-/// been generated. In order to do this, it generates a stub which jumps to
-/// the lazy function compiler, which will eventually get fixed to call the
-/// function directly.
-///
-void *VM::emitStubForFunction(const Function &F) {
-#if defined(i386) || defined(__i386__) || defined(__x86__)
- MCE->startFunctionStub(F, 6);
- MCE->emitByte(0xE8); // Call with 32 bit pc-rel destination...
- MCE->emitGlobalAddress((GlobalValue*)&F, true);
- MCE->emitByte(0xCD); // Interrupt - Just a marker identifying the stub!
- return MCE->finishFunctionStub(F);
-#else
- abort();
-#endif
-}
-
-void VM::registerCallback() {
- TheVM = this;
-}
-
-
if (Arch == "x86") {
TargetMachineAllocator = allocateX86TargetMachine;
} else if (Arch == "sparc") {
- TargetMachineAllocator = allocateSparcTargetMachine;
+ //TargetMachineAllocator = allocateSparcTargetMachine;
}
if (TargetMachineAllocator) {
if (Arch == "x86") {
MCE = createX86Emitter(*this);
} else if (Arch == "sparc") {
- MCE = createSparcEmitter(*this);
+ //MCE = createSparcEmitter(*this);
}
setupPassManager();
- registerCallback();
emitGlobals();
}
PassManager PM; // Passes to compile a function
MachineCodeEmitter *MCE; // MCE object
- // FunctionRefs - A mapping between addresses that refer to unresolved
- // functions and the LLVM function object itself. This is used by the fault
- // handler to lazily patch up references...
- //
- std::map<void*, Function*> FunctionRefs;
-
public:
VM(Module *M, TargetMachine *tm);
~VM();
virtual int run(const std::string &FnName,
const std::vector<std::string> &Args);
- void addFunctionRef(void *Ref, Function *F) {
- FunctionRefs[Ref] = F;
- }
-
- const std::string &getFunctionReferencedName(void *RefAddr);
-
- void *resolveFunctionReference(void *RefAddr);
-
/// getPointerToNamedFunction - This method returns the address of the
/// specified function by using the dlsym function call. As such it is only
/// useful for resolving library symbols, not code generated symbols.
///
static void runAtExitHandlers();
+ /// getPointerToFunction - This returns the address of the specified function,
+ /// compiling it if necessary.
+ void *getPointerToFunction(const Function *F);
+
private:
static MachineCodeEmitter *createX86Emitter(VM &V);
static MachineCodeEmitter *createSparcEmitter(VM &V);
void setupPassManager();
- void *getPointerToFunction(const Function *F);
-
- void registerCallback();
-
- /// emitStubForFunction - This method is used by the JIT when it needs to emit
- /// the address of a function for a function whose code has not yet been
- /// generated. In order to do this, it generates a stub which jumps to the
- /// lazy function compiler, which will eventually get fixed to call the
- /// function directly.
- ///
- void *emitStubForFunction(const Function &F);
};
#endif
#include "llvm/Function.h"
#include "Support/Statistic.h"
+static VM *TheVM = 0;
+
namespace {
Statistic<> NumBytes("jello", "Number of bytes of machine code compiled");
class Emitter : public MachineCodeEmitter {
- VM &TheVM;
-
+ // CurBlock - The start of the current block of memory. CurByte - The
+ // current byte being emitted to.
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*, unsigned *> > BBRefs;
- std::map<BasicBlock*, unsigned> BBLocations;
+
+ // ConstantPoolAddresses - Contains the location for each entry in the
+ // constant pool.
std::vector<void*> ConstantPoolAddresses;
public:
- Emitter(VM &vm) : TheVM(vm) {}
+ Emitter(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);
- private:
- void emitAddress(void *Addr, bool isPCRelative);
+ virtual void emitWord(unsigned W);
+
+ virtual uint64_t getGlobalValueAddress(GlobalValue *V);
+ virtual uint64_t getGlobalValueAddress(const std::string &Name);
+ virtual uint64_t getConstantPoolEntryAddress(unsigned Entry);
+ virtual uint64_t getCurrentPCValue();
+
+ // forceCompilationOf - Force the compilation of the specified function, and
+ // return its address, because we REALLY need the address now.
+ //
+ // FIXME: This is JIT specific!
+ //
+ virtual uint64_t forceCompilationOf(Function *F);
};
}
void Emitter::startFunction(MachineFunction &F) {
- CurBlock = (unsigned char *)getMemory(8);
+ CurBlock = (unsigned char *)getMemory(16);
CurByte = CurBlock; // Start writing at the beginning of the fn.
- TheVM.addGlobalMapping(F.getFunction(), CurBlock);
+ TheVM->addGlobalMapping(F.getFunction(), CurBlock);
}
void Emitter::finishFunction(MachineFunction &F) {
ConstantPoolAddresses.clear();
- for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
- unsigned Location = BBLocations[BBRefs[i].first];
- unsigned *Ref = BBRefs[i].second;
- *Ref = Location-(unsigned)(intptr_t)Ref-4;
- }
- BBRefs.clear();
- BBLocations.clear();
-
NumBytes += CurByte-CurBlock;
DEBUG(std::cerr << "Finished CodeGen of [0x" << std::hex
// 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);
+ void *Addr = malloc(TheVM->getTargetData().getTypeSize(Ty));
+ TheVM->InitializeMemory(Constants[i], Addr);
ConstantPoolAddresses.push_back(Addr);
}
}
-
-void Emitter::startBasicBlock(MachineBasicBlock &BB) {
- BBLocations[BB.getBasicBlock()] = (unsigned)(intptr_t)CurByte;
-}
-
-
void Emitter::startFunctionStub(const Function &F, unsigned StubSize) {
SavedCurBlock = CurBlock; SavedCurByte = CurByte;
// FIXME: this is a huge waste of memory.
*CurByte++ = B; // Write the byte to memory
}
+void Emitter::emitWord(unsigned W) {
+ // FIXME: This won't work if the endianness of the host and target don't
+ // agree! (For a JIT this can't happen though. :)
+ *(unsigned*)CurByte = W;
+ CurByte += sizeof(unsigned);
+}
+
+
+uint64_t Emitter::getGlobalValueAddress(GlobalValue *V) {
+ // Try looking up the function to see if it is already compiled, if not return
+ // 0.
+ return (intptr_t)TheVM->getPointerToGlobalIfAvailable(V);
+}
+uint64_t Emitter::getGlobalValueAddress(const std::string &Name) {
+ return (intptr_t)TheVM->getPointerToNamedFunction(Name);
+}
+
+// getConstantPoolEntryAddress - Return the address of the 'ConstantNum' entry
+// in the constant pool that was last emitted with the 'emitConstantPool'
+// method.
+//
+uint64_t Emitter::getConstantPoolEntryAddress(unsigned ConstantNum) {
+ assert(ConstantNum < ConstantPoolAddresses.size() &&
+ "Invalid ConstantPoolIndex!");
+ return (intptr_t)ConstantPoolAddresses[ConstantNum];
+}
+
+// getCurrentPCValue - This returns the address that the next emitted byte
+// will be output to.
+//
+uint64_t Emitter::getCurrentPCValue() {
+ return (intptr_t)CurByte;
+}
+
+uint64_t Emitter::forceCompilationOf(Function *F) {
+ return (intptr_t)TheVM->getPointerToFunction(F);
+}
+
+#if 0
+
// emitPCRelativeDisp - For functions, just output a displacement that will
// cause a reference to the zero page, which will cause a seg-fault, causing
void Emitter::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)) {
+ if (void *Addr = TheVM->getPointerToGlobalIfAvailable(V)) {
emitAddress(Addr, isPCRelative);
} else { // Function has not yet been code generated!
- TheVM.addFunctionRef(CurByte, cast<Function>(V));
+ TheVM->addFunctionRef(CurByte, cast<Function>(V));
// Delayed resolution...
emitAddress((void*)VM::CompilationCallback, isPCRelative);
}
} else {
- emitAddress(TheVM.getPointerToGlobal(V), isPCRelative);
+ emitAddress(TheVM->getPointerToGlobal(V), isPCRelative);
}
}
-void Emitter::emitGlobalAddress(const std::string &Name, bool isPCRelative) {
- emitAddress(TheVM.getPointerToNamedFunction(Name), isPCRelative);
-}
-
void Emitter::emitFunctionConstantValueAddress(unsigned ConstantNum,
int Offset) {
assert(ConstantNum < ConstantPoolAddresses.size() &&
*(void**)CurByte = (char*)ConstantPoolAddresses[ConstantNum]+Offset;
CurByte += 4;
}
+#endif
}
}
-void *VM::resolveFunctionReference(void *RefAddr) {
- Function *F = FunctionRefs[RefAddr];
- assert(F && "Reference address not known!");
-
- void *Addr = getPointerToFunction(F);
- assert(Addr && "Pointer to function unknown!");
-
- FunctionRefs.erase(RefAddr);
- return Addr;
-}
-
-const std::string &VM::getFunctionReferencedName(void *RefAddr) {
- assert(FunctionRefs[RefAddr] && "Function address unknown!");
- return FunctionRefs[RefAddr]->getName();
-}
-
/// getPointerToFunction - This method is used to get the address of the
/// specified function, compiling it if neccesary.
///
return Addr = getPointerToNamedFunction(F->getName());
static bool isAlreadyCodeGenerating = false;
- if (isAlreadyCodeGenerating) {
- // Generate a function stub instead of reentering...
- void *SAddr = emitStubForFunction(*F);
- assert(SAddr && "Target machine doesn't support function stub generation!");
- return SAddr;
- }
+ assert(!isAlreadyCodeGenerating && "ERROR: RECURSIVE COMPILATION DETECTED!");
// FIXME: JIT all of the functions in the module. Eventually this will JIT
// functions on demand. This has the effect of populating all of the
PassManager PM; // Passes to compile a function
MachineCodeEmitter *MCE; // MCE object
- // FunctionRefs - A mapping between addresses that refer to unresolved
- // functions and the LLVM function object itself. This is used by the fault
- // handler to lazily patch up references...
- //
- std::map<void*, Function*> FunctionRefs;
-
public:
VM(Module *M, TargetMachine *tm);
~VM();
virtual int run(const std::string &FnName,
const std::vector<std::string> &Args);
- void addFunctionRef(void *Ref, Function *F) {
- FunctionRefs[Ref] = F;
- }
-
- const std::string &getFunctionReferencedName(void *RefAddr);
-
- void *resolveFunctionReference(void *RefAddr);
-
/// getPointerToNamedFunction - This method returns the address of the
/// specified function by using the dlsym function call. As such it is only
/// useful for resolving library symbols, not code generated symbols.
///
static void runAtExitHandlers();
+ /// getPointerToFunction - This returns the address of the specified function,
+ /// compiling it if necessary.
+ void *getPointerToFunction(const Function *F);
+
private:
static MachineCodeEmitter *createX86Emitter(VM &V);
static MachineCodeEmitter *createSparcEmitter(VM &V);
void setupPassManager();
- void *getPointerToFunction(const Function *F);
-
- void registerCallback();
-
- /// emitStubForFunction - This method is used by the JIT when it needs to emit
- /// the address of a function for a function whose code has not yet been
- /// generated. In order to do this, it generates a stub which jumps to the
- /// lazy function compiler, which will eventually get fixed to call the
- /// function directly.
- ///
- void *emitStubForFunction(const Function &F);
};
#endif
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