-//===-- Emitter.cpp - Write machine code to executable memory -------------===//
-//
+//===-- JITEmitter.cpp - Write machine code to executable memory ----------===//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This file defines a MachineCodeEmitter object that is used by the JIT to
#include "JIT.h"
#include "llvm/Constant.h"
#include "llvm/Module.h"
+#include "llvm/Type.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineRelocation.h"
+#include "llvm/ExecutionEngine/JITMemoryManager.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetJITInfo.h"
+#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/MutexGuard.h"
+#include "llvm/System/Disassembler.h"
#include "llvm/ADT/Statistic.h"
-#include "llvm/System/Memory.h"
+#include <algorithm>
using namespace llvm;
-namespace {
- Statistic<> NumBytes("jit", "Number of bytes of machine code compiled");
- JIT *TheJIT = 0;
-}
+STATISTIC(NumBytes, "Number of bytes of machine code compiled");
+STATISTIC(NumRelos, "Number of relocations applied");
+static JIT *TheJIT = 0;
//===----------------------------------------------------------------------===//
-// JITMemoryManager code.
+// JIT lazy compilation code.
//
namespace {
- /// JITMemoryManager - Manage memory for the JIT code generation in a logical,
- /// sane way. This splits a large block of MAP_NORESERVE'd memory into two
- /// sections, one for function stubs, one for the functions themselves. We
- /// have to do this because we may need to emit a function stub while in the
- /// middle of emitting a function, and we don't know how large the function we
- /// are emitting is. This never bothers to release the memory, because when
- /// we are ready to destroy the JIT, the program exits.
- class JITMemoryManager {
- sys::MemoryBlock MemBlock; // Virtual memory block allocated RWX
- unsigned char *MemBase; // Base of block of memory, start of stub mem
- unsigned char *FunctionBase; // Start of the function body area
- unsigned char *CurStubPtr, *CurFunctionPtr;
- public:
- JITMemoryManager();
-
- inline unsigned char *allocateStub(unsigned StubSize);
- inline unsigned char *startFunctionBody();
- inline void endFunctionBody(unsigned char *FunctionEnd);
- };
-}
-
-JITMemoryManager::JITMemoryManager() {
- // Allocate a 16M block of memory...
- MemBlock = sys::Memory::AllocateRWX((16 << 20));
- MemBase = reinterpret_cast<unsigned char*>(MemBlock.base());
- FunctionBase = MemBase + 512*1024; // Use 512k for stubs
-
- // Allocate stubs backwards from the function base, allocate functions forward
- // from the function base.
- CurStubPtr = CurFunctionPtr = FunctionBase;
-}
+ class JITResolverState {
+ private:
+ /// FunctionToStubMap - Keep track of the stub created for a particular
+ /// function so that we can reuse them if necessary.
+ std::map<Function*, void*> FunctionToStubMap;
-unsigned char *JITMemoryManager::allocateStub(unsigned StubSize) {
- CurStubPtr -= StubSize;
- if (CurStubPtr < MemBase) {
- std::cerr << "JIT ran out of memory for function stubs!\n";
- abort();
- }
- return CurStubPtr;
-}
+ /// StubToFunctionMap - Keep track of the function that each stub
+ /// corresponds to.
+ std::map<void*, Function*> StubToFunctionMap;
-unsigned char *JITMemoryManager::startFunctionBody() {
- // Round up to an even multiple of 8 bytes, this should eventually be target
- // specific.
- return (unsigned char*)(((intptr_t)CurFunctionPtr + 7) & ~7);
-}
+ public:
+ std::map<Function*, void*>& getFunctionToStubMap(const MutexGuard& locked) {
+ assert(locked.holds(TheJIT->lock));
+ return FunctionToStubMap;
+ }
-void JITMemoryManager::endFunctionBody(unsigned char *FunctionEnd) {
- assert(FunctionEnd > CurFunctionPtr);
- CurFunctionPtr = FunctionEnd;
-}
+ std::map<void*, Function*>& getStubToFunctionMap(const MutexGuard& locked) {
+ assert(locked.holds(TheJIT->lock));
+ return StubToFunctionMap;
+ }
+ };
-//===----------------------------------------------------------------------===//
-// JIT lazy compilation code.
-//
-namespace {
/// JITResolver - Keep track of, and resolve, call sites for functions that
/// have not yet been compiled.
class JITResolver {
- /// MCE - The MachineCodeEmitter to use to emit stubs with.
- MachineCodeEmitter &MCE;
-
/// LazyResolverFn - The target lazy resolver function that we actually
/// rewrite instructions to use.
TargetJITInfo::LazyResolverFn LazyResolverFn;
- // FunctionToStubMap - Keep track of the stub created for a particular
- // function so that we can reuse them if necessary.
- std::map<Function*, void*> FunctionToStubMap;
+ JITResolverState state;
- // StubToFunctionMap - Keep track of the function that each stub corresponds
- // to.
- std::map<void*, Function*> StubToFunctionMap;
+ /// ExternalFnToStubMap - This is the equivalent of FunctionToStubMap for
+ /// external functions.
+ std::map<void*, void*> ExternalFnToStubMap;
+
+ //map addresses to indexes in the GOT
+ std::map<void*, unsigned> revGOTMap;
+ unsigned nextGOTIndex;
+ static JITResolver *TheJITResolver;
public:
- JITResolver(MachineCodeEmitter &mce) : MCE(mce) {
- LazyResolverFn =
- TheJIT->getJITInfo().getLazyResolverFunction(JITCompilerFn);
+ JITResolver(JIT &jit) : nextGOTIndex(0) {
+ TheJIT = &jit;
+
+ LazyResolverFn = jit.getJITInfo().getLazyResolverFunction(JITCompilerFn);
+ assert(TheJITResolver == 0 && "Multiple JIT resolvers?");
+ TheJITResolver = this;
+ }
+
+ ~JITResolver() {
+ TheJITResolver = 0;
}
/// getFunctionStub - This returns a pointer to a function stub, creating
/// one on demand as needed.
void *getFunctionStub(Function *F);
+ /// getExternalFunctionStub - Return a stub for the function at the
+ /// specified address, created lazily on demand.
+ void *getExternalFunctionStub(void *FnAddr);
+
/// AddCallbackAtLocation - If the target is capable of rewriting an
/// instruction without the use of a stub, record the location of the use so
/// we know which function is being used at the location.
void *AddCallbackAtLocation(Function *F, void *Location) {
+ MutexGuard locked(TheJIT->lock);
/// Get the target-specific JIT resolver function.
- StubToFunctionMap[Location] = F;
- return (void*)LazyResolverFn;
+ state.getStubToFunctionMap(locked)[Location] = F;
+ return (void*)(intptr_t)LazyResolverFn;
}
+ /// getGOTIndexForAddress - Return a new or existing index in the GOT for
+ /// an address. This function only manages slots, it does not manage the
+ /// contents of the slots or the memory associated with the GOT.
+ unsigned getGOTIndexForAddr(void *addr);
+
/// JITCompilerFn - This function is called to resolve a stub to a compiled
/// address. If the LLVM Function corresponding to the stub has not yet
/// been compiled, this function compiles it first.
};
}
-/// getJITResolver - This function returns the one instance of the JIT resolver.
-///
-static JITResolver &getJITResolver(MachineCodeEmitter *MCE = 0) {
- static JITResolver TheJITResolver(*MCE);
- return TheJITResolver;
+JITResolver *JITResolver::TheJITResolver = 0;
+
+#if (defined(__POWERPC__) || defined (__ppc__) || defined(_POWER)) && \
+ defined(__APPLE__)
+extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
+#endif
+
+/// synchronizeICache - On some targets, the JIT emitted code must be
+/// explicitly refetched to ensure correct execution.
+static void synchronizeICache(const void *Addr, size_t len) {
+#if (defined(__POWERPC__) || defined (__ppc__) || defined(_POWER)) && \
+ defined(__APPLE__)
+ sys_icache_invalidate(Addr, len);
+#endif
}
/// getFunctionStub - This returns a pointer to a function stub, creating
/// one on demand as needed.
void *JITResolver::getFunctionStub(Function *F) {
+ MutexGuard locked(TheJIT->lock);
+
// If we already have a stub for this function, recycle it.
- void *&Stub = FunctionToStubMap[F];
+ void *&Stub = state.getFunctionToStubMap(locked)[F];
if (Stub) return Stub;
// Call the lazy resolver function unless we already KNOW it is an external
// function, in which case we just skip the lazy resolution step.
- void *Actual = (void*)LazyResolverFn;
- if (F->hasExternalLinkage())
+ void *Actual = (void*)(intptr_t)LazyResolverFn;
+ if (F->isDeclaration() && !F->hasNotBeenReadFromBitcode())
Actual = TheJIT->getPointerToFunction(F);
-
+
// Otherwise, codegen a new stub. For now, the stub will call the lazy
// resolver function.
- Stub = TheJIT->getJITInfo().emitFunctionStub(Actual, MCE);
+ Stub = TheJIT->getJITInfo().emitFunctionStub(Actual,
+ *TheJIT->getCodeEmitter());
- if (F->hasExternalLinkage()) {
+ if (Actual != (void*)(intptr_t)LazyResolverFn) {
// If we are getting the stub for an external function, we really want the
// address of the stub in the GlobalAddressMap for the JIT, not the address
// of the external function.
TheJIT->updateGlobalMapping(F, Stub);
}
- DEBUG(std::cerr << "JIT: Stub emitted at [" << Stub << "] for function '"
- << F->getName() << "\n");
+ // Invalidate the icache if necessary.
+ synchronizeICache(Stub, TheJIT->getCodeEmitter()->getCurrentPCValue() -
+ (intptr_t)Stub);
+
+ DOUT << "JIT: Stub emitted at [" << Stub << "] for function '"
+ << F->getName() << "'\n";
// Finally, keep track of the stub-to-Function mapping so that the
// JITCompilerFn knows which function to compile!
- StubToFunctionMap[Stub] = F;
+ state.getStubToFunctionMap(locked)[Stub] = F;
+ return Stub;
+}
+
+/// getExternalFunctionStub - Return a stub for the function at the
+/// specified address, created lazily on demand.
+void *JITResolver::getExternalFunctionStub(void *FnAddr) {
+ // If we already have a stub for this function, recycle it.
+ void *&Stub = ExternalFnToStubMap[FnAddr];
+ if (Stub) return Stub;
+
+ Stub = TheJIT->getJITInfo().emitFunctionStub(FnAddr,
+ *TheJIT->getCodeEmitter());
+
+ // Invalidate the icache if necessary.
+ synchronizeICache(Stub, TheJIT->getCodeEmitter()->getCurrentPCValue() -
+ (intptr_t)Stub);
+
+ DOUT << "JIT: Stub emitted at [" << Stub
+ << "] for external function at '" << FnAddr << "'\n";
return Stub;
}
+unsigned JITResolver::getGOTIndexForAddr(void* addr) {
+ unsigned idx = revGOTMap[addr];
+ if (!idx) {
+ idx = ++nextGOTIndex;
+ revGOTMap[addr] = idx;
+ DOUT << "Adding GOT entry " << idx
+ << " for addr " << addr << "\n";
+ }
+ return idx;
+}
+
/// JITCompilerFn - This function is called when a lazy compilation stub has
/// been entered. It looks up which function this stub corresponds to, compiles
/// it if necessary, then returns the resultant function pointer.
void *JITResolver::JITCompilerFn(void *Stub) {
- JITResolver &JR = getJITResolver();
-
+ JITResolver &JR = *TheJITResolver;
+
+ MutexGuard locked(TheJIT->lock);
+
// The address given to us for the stub may not be exactly right, it might be
// a little bit after the stub. As such, use upper_bound to find it.
std::map<void*, Function*>::iterator I =
- JR.StubToFunctionMap.upper_bound(Stub);
- assert(I != JR.StubToFunctionMap.begin() && "This is not a known stub!");
+ JR.state.getStubToFunctionMap(locked).upper_bound(Stub);
+ assert(I != JR.state.getStubToFunctionMap(locked).begin() &&
+ "This is not a known stub!");
Function *F = (--I)->second;
- // The target function will rewrite the stub so that the compilation callback
- // function is no longer called from this stub.
- JR.StubToFunctionMap.erase(I);
-
- DEBUG(std::cerr << "JIT: Lazily resolving function '" << F->getName()
- << "' In stub ptr = " << Stub << " actual ptr = "
- << I->first << "\n");
-
- void *Result = TheJIT->getPointerToFunction(F);
+ // If we have already code generated the function, just return the address.
+ void *Result = TheJIT->getPointerToGlobalIfAvailable(F);
+
+ if (!Result) {
+ // Otherwise we don't have it, do lazy compilation now.
+
+ // If lazy compilation is disabled, emit a useful error message and abort.
+ if (TheJIT->isLazyCompilationDisabled()) {
+ cerr << "LLVM JIT requested to do lazy compilation of function '"
+ << F->getName() << "' when lazy compiles are disabled!\n";
+ abort();
+ }
+
+ // We might like to remove the stub from the StubToFunction map.
+ // We can't do that! Multiple threads could be stuck, waiting to acquire the
+ // lock above. As soon as the 1st function finishes compiling the function,
+ // the next one will be released, and needs to be able to find the function
+ // it needs to call.
+ //JR.state.getStubToFunctionMap(locked).erase(I);
+
+ DOUT << "JIT: Lazily resolving function '" << F->getName()
+ << "' In stub ptr = " << Stub << " actual ptr = "
+ << I->first << "\n";
+
+ Result = TheJIT->getPointerToFunction(F);
+ }
// We don't need to reuse this stub in the future, as F is now compiled.
- JR.FunctionToStubMap.erase(F);
+ JR.state.getFunctionToStubMap(locked).erase(F);
// FIXME: We could rewrite all references to this stub if we knew them.
+
+ // What we will do is set the compiled function address to map to the
+ // same GOT entry as the stub so that later clients may update the GOT
+ // if they see it still using the stub address.
+ // Note: this is done so the Resolver doesn't have to manage GOT memory
+ // Do this without allocating map space if the target isn't using a GOT
+ if(JR.revGOTMap.find(Stub) != JR.revGOTMap.end())
+ JR.revGOTMap[Result] = JR.revGOTMap[Stub];
+
return Result;
}
//===----------------------------------------------------------------------===//
-// JIT MachineCodeEmitter code.
+// JITEmitter code.
//
namespace {
- /// Emitter - The JIT implementation of the MachineCodeEmitter, which is used
- /// to output functions to memory for execution.
- class Emitter : public MachineCodeEmitter {
- JITMemoryManager MemMgr;
-
- // CurBlock - The start of the current block of memory. CurByte - The
- // current byte being emitted to.
- unsigned char *CurBlock, *CurByte;
+ /// JITEmitter - The JIT implementation of the MachineCodeEmitter, which is
+ /// used to output functions to memory for execution.
+ class JITEmitter : public MachineCodeEmitter {
+ JITMemoryManager *MemMgr;
// When outputting a function stub in the context of some other function, we
- // save CurBlock and CurByte here.
- unsigned char *SavedCurBlock, *SavedCurByte;
-
- // ConstantPoolAddresses - Contains the location for each entry in the
- // constant pool.
- std::vector<void*> ConstantPoolAddresses;
+ // save BufferBegin/BufferEnd/CurBufferPtr here.
+ unsigned char *SavedBufferBegin, *SavedBufferEnd, *SavedCurBufferPtr;
/// Relocations - These are the relocations that the function needs, as
/// emitted.
std::vector<MachineRelocation> Relocations;
+
+ /// MBBLocations - This vector is a mapping from MBB ID's to their address.
+ /// It is filled in by the StartMachineBasicBlock callback and queried by
+ /// the getMachineBasicBlockAddress callback.
+ std::vector<intptr_t> MBBLocations;
+
+ /// ConstantPool - The constant pool for the current function.
+ ///
+ MachineConstantPool *ConstantPool;
+
+ /// ConstantPoolBase - A pointer to the first entry in the constant pool.
+ ///
+ void *ConstantPoolBase;
+
+ /// JumpTable - The jump tables for the current function.
+ ///
+ MachineJumpTableInfo *JumpTable;
+
+ /// JumpTableBase - A pointer to the first entry in the jump table.
+ ///
+ void *JumpTableBase;
+
+ /// Resolver - This contains info about the currently resolved functions.
+ JITResolver Resolver;
public:
- Emitter(JIT &jit) { TheJIT = &jit; }
+ JITEmitter(JIT &jit, JITMemoryManager *JMM) : Resolver(jit) {
+ MemMgr = JMM ? JMM : JITMemoryManager::CreateDefaultMemManager();
+ if (jit.getJITInfo().needsGOT()) {
+ MemMgr->AllocateGOT();
+ DOUT << "JIT is managing a GOT\n";
+ }
+ }
+ ~JITEmitter() {
+ delete MemMgr;
+ }
+
+ JITResolver &getJITResolver() { return Resolver; }
virtual void startFunction(MachineFunction &F);
- virtual void finishFunction(MachineFunction &F);
- virtual void emitConstantPool(MachineConstantPool *MCP);
- virtual void startFunctionStub(unsigned StubSize);
+ virtual bool finishFunction(MachineFunction &F);
+
+ void emitConstantPool(MachineConstantPool *MCP);
+ void initJumpTableInfo(MachineJumpTableInfo *MJTI);
+ void emitJumpTableInfo(MachineJumpTableInfo *MJTI);
+
+ virtual void startFunctionStub(unsigned StubSize, unsigned Alignment = 1);
virtual void* finishFunctionStub(const Function *F);
- virtual void emitByte(unsigned char B);
- virtual void emitWord(unsigned W);
- virtual void emitWordAt(unsigned W, unsigned *Ptr);
virtual void addRelocation(const MachineRelocation &MR) {
Relocations.push_back(MR);
}
+
+ virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) {
+ if (MBBLocations.size() <= (unsigned)MBB->getNumber())
+ MBBLocations.resize((MBB->getNumber()+1)*2);
+ MBBLocations[MBB->getNumber()] = getCurrentPCValue();
+ }
- virtual uint64_t getCurrentPCValue();
- virtual uint64_t getCurrentPCOffset();
- virtual uint64_t getGlobalValueAddress(GlobalValue *V);
- virtual uint64_t getGlobalValueAddress(const char *Name);
- virtual uint64_t getConstantPoolEntryAddress(unsigned Entry);
-
- // 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);
+ virtual intptr_t getConstantPoolEntryAddress(unsigned Entry) const;
+ virtual intptr_t getJumpTableEntryAddress(unsigned Entry) const;
+
+ virtual intptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
+ assert(MBBLocations.size() > (unsigned)MBB->getNumber() &&
+ MBBLocations[MBB->getNumber()] && "MBB not emitted!");
+ return MBBLocations[MBB->getNumber()];
+ }
+ /// deallocateMemForFunction - Deallocate all memory for the specified
+ /// function body.
+ void deallocateMemForFunction(Function *F) {
+ MemMgr->deallocateMemForFunction(F);
+ }
private:
void *getPointerToGlobal(GlobalValue *GV, void *Reference, bool NoNeedStub);
};
}
-MachineCodeEmitter *JIT::createEmitter(JIT &jit) {
- return new Emitter(jit);
-}
-
-void *Emitter::getPointerToGlobal(GlobalValue *V, void *Reference,
- bool DoesntNeedStub) {
+void *JITEmitter::getPointerToGlobal(GlobalValue *V, void *Reference,
+ bool DoesntNeedStub) {
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) {
/// FIXME: If we straightened things out, this could actually emit the
/// global immediately instead of queuing it for codegen later!
- GlobalVariable *GV = cast<GlobalVariable>(V);
return TheJIT->getOrEmitGlobalVariable(GV);
}
void *ResultPtr = TheJIT->getPointerToGlobalIfAvailable(F);
if (ResultPtr) return ResultPtr;
- if (F->hasExternalLinkage()) {
+ if (F->isDeclaration() && !F->hasNotBeenReadFromBitcode()) {
// If this is an external function pointer, we can force the JIT to
// 'compile' it, which really just adds it to the map.
if (DoesntNeedStub)
return TheJIT->getPointerToFunction(F);
- return getJITResolver(this).getFunctionStub(F);
+ return Resolver.getFunctionStub(F);
}
// Okay, the function has not been compiled yet, if the target callback
// mechanism is capable of rewriting the instruction directly, prefer to do
// that instead of emitting a stub.
if (DoesntNeedStub)
- return getJITResolver(this).AddCallbackAtLocation(F, Reference);
+ return Resolver.AddCallbackAtLocation(F, Reference);
// Otherwise, we have to emit a lazy resolving stub.
- return getJITResolver(this).getFunctionStub(F);
+ return Resolver.getFunctionStub(F);
}
-void Emitter::startFunction(MachineFunction &F) {
- CurByte = CurBlock = MemMgr.startFunctionBody();
- TheJIT->addGlobalMapping(F.getFunction(), CurBlock);
+void JITEmitter::startFunction(MachineFunction &F) {
+ uintptr_t ActualSize;
+ BufferBegin = CurBufferPtr = MemMgr->startFunctionBody(F.getFunction(),
+ ActualSize);
+ BufferEnd = BufferBegin+ActualSize;
+
+ // Ensure the constant pool/jump table info is at least 4-byte aligned.
+ emitAlignment(16);
+
+ emitConstantPool(F.getConstantPool());
+ initJumpTableInfo(F.getJumpTableInfo());
+
+ // About to start emitting the machine code for the function.
+ emitAlignment(std::max(F.getFunction()->getAlignment(), 8U));
+ TheJIT->updateGlobalMapping(F.getFunction(), CurBufferPtr);
+
+ MBBLocations.clear();
}
-void Emitter::finishFunction(MachineFunction &F) {
- MemMgr.endFunctionBody(CurByte);
- ConstantPoolAddresses.clear();
- NumBytes += CurByte-CurBlock;
+bool JITEmitter::finishFunction(MachineFunction &F) {
+ if (CurBufferPtr == BufferEnd) {
+ // FIXME: Allocate more space, then try again.
+ cerr << "JIT: Ran out of space for generated machine code!\n";
+ abort();
+ }
+
+ emitJumpTableInfo(F.getJumpTableInfo());
+
+ // FnStart is the start of the text, not the start of the constant pool and
+ // other per-function data.
+ unsigned char *FnStart =
+ (unsigned char *)TheJIT->getPointerToGlobalIfAvailable(F.getFunction());
+ unsigned char *FnEnd = CurBufferPtr;
+
+ MemMgr->endFunctionBody(F.getFunction(), BufferBegin, FnEnd);
+ NumBytes += FnEnd-FnStart;
if (!Relocations.empty()) {
+ NumRelos += Relocations.size();
+
// Resolve the relocations to concrete pointers.
for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
MachineRelocation &MR = Relocations[i];
void *ResultPtr;
- if (MR.isString())
+ if (MR.isString()) {
ResultPtr = TheJIT->getPointerToNamedFunction(MR.getString());
- else
+
+ // If the target REALLY wants a stub for this function, emit it now.
+ if (!MR.doesntNeedFunctionStub())
+ ResultPtr = Resolver.getExternalFunctionStub(ResultPtr);
+ } else if (MR.isGlobalValue()) {
ResultPtr = getPointerToGlobal(MR.getGlobalValue(),
- CurBlock+MR.getMachineCodeOffset(),
+ BufferBegin+MR.getMachineCodeOffset(),
MR.doesntNeedFunctionStub());
+ } else if (MR.isBasicBlock()) {
+ ResultPtr = (void*)getMachineBasicBlockAddress(MR.getBasicBlock());
+ } else if (MR.isConstantPoolIndex()) {
+ ResultPtr=(void*)getConstantPoolEntryAddress(MR.getConstantPoolIndex());
+ } else {
+ assert(MR.isJumpTableIndex());
+ ResultPtr=(void*)getJumpTableEntryAddress(MR.getJumpTableIndex());
+ }
+
MR.setResultPointer(ResultPtr);
+
+ // if we are managing the GOT and the relocation wants an index,
+ // give it one
+ if (MR.isGOTRelative() && MemMgr->isManagingGOT()) {
+ unsigned idx = Resolver.getGOTIndexForAddr(ResultPtr);
+ MR.setGOTIndex(idx);
+ if (((void**)MemMgr->getGOTBase())[idx] != ResultPtr) {
+ DOUT << "GOT was out of date for " << ResultPtr
+ << " pointing at " << ((void**)MemMgr->getGOTBase())[idx]
+ << "\n";
+ ((void**)MemMgr->getGOTBase())[idx] = ResultPtr;
+ }
+ }
}
- TheJIT->getJITInfo().relocate(CurBlock, &Relocations[0],
- Relocations.size());
+ TheJIT->getJITInfo().relocate(BufferBegin, &Relocations[0],
+ Relocations.size(), MemMgr->getGOTBase());
}
- DEBUG(std::cerr << "JIT: Finished CodeGen of [" << (void*)CurBlock
- << "] Function: " << F.getFunction()->getName()
- << ": " << CurByte-CurBlock << " bytes of text, "
- << Relocations.size() << " relocations\n");
+ // Update the GOT entry for F to point to the new code.
+ if (MemMgr->isManagingGOT()) {
+ unsigned idx = Resolver.getGOTIndexForAddr((void*)BufferBegin);
+ if (((void**)MemMgr->getGOTBase())[idx] != (void*)BufferBegin) {
+ DOUT << "GOT was out of date for " << (void*)BufferBegin
+ << " pointing at " << ((void**)MemMgr->getGOTBase())[idx] << "\n";
+ ((void**)MemMgr->getGOTBase())[idx] = (void*)BufferBegin;
+ }
+ }
+
+ // Invalidate the icache if necessary.
+ synchronizeICache(FnStart, FnEnd-FnStart);
+
+ DOUT << "JIT: Finished CodeGen of [" << (void*)FnStart
+ << "] Function: " << F.getFunction()->getName()
+ << ": " << (FnEnd-FnStart) << " bytes of text, "
+ << Relocations.size() << " relocations\n";
Relocations.clear();
+
+#ifndef NDEBUG
+ if (sys::hasDisassembler())
+ DOUT << "Disassembled code:\n"
+ << sys::disassembleBuffer(FnStart, FnEnd-FnStart, (uintptr_t)FnStart);
+#endif
+
+ return false;
}
-void Emitter::emitConstantPool(MachineConstantPool *MCP) {
- const std::vector<Constant*> &Constants = MCP->getConstants();
+void JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
+ const std::vector<MachineConstantPoolEntry> &Constants = MCP->getConstants();
if (Constants.empty()) return;
- std::vector<unsigned> ConstantOffset;
- ConstantOffset.reserve(Constants.size());
+ MachineConstantPoolEntry CPE = Constants.back();
+ unsigned Size = CPE.Offset;
+ const Type *Ty = CPE.isMachineConstantPoolEntry()
+ ? CPE.Val.MachineCPVal->getType() : CPE.Val.ConstVal->getType();
+ Size += TheJIT->getTargetData()->getABITypeSize(Ty);
- // Calculate how much space we will need for all the constants, and the offset
- // each one will live in.
- unsigned TotalSize = 0;
- for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
- const Type *Ty = Constants[i]->getType();
- unsigned Size = TheJIT->getTargetData().getTypeSize(Ty);
- unsigned Alignment = TheJIT->getTargetData().getTypeAlignment(Ty);
- // Make sure to take into account the alignment requirements of the type.
- TotalSize = (TotalSize + Alignment-1) & ~(Alignment-1);
-
- // Remember the offset this element lives at.
- ConstantOffset.push_back(TotalSize);
- TotalSize += Size; // Reserve space for the constant.
- }
+ ConstantPoolBase = allocateSpace(Size, 1 << MCP->getConstantPoolAlignment());
+ ConstantPool = MCP;
- // Now that we know how much memory to allocate, do so.
- char *Pool = new char[TotalSize];
+ if (ConstantPoolBase == 0) return; // Buffer overflow.
- // Actually output all of the constants, and remember their addresses.
+ // Initialize the memory for all of the constant pool entries.
for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
- void *Addr = Pool + ConstantOffset[i];
- TheJIT->InitializeMemory(Constants[i], Addr);
- ConstantPoolAddresses.push_back(Addr);
+ void *CAddr = (char*)ConstantPoolBase+Constants[i].Offset;
+ if (Constants[i].isMachineConstantPoolEntry()) {
+ // FIXME: add support to lower machine constant pool values into bytes!
+ cerr << "Initialize memory with machine specific constant pool entry"
+ << " has not been implemented!\n";
+ abort();
+ }
+ TheJIT->InitializeMemory(Constants[i].Val.ConstVal, CAddr);
}
}
-void Emitter::startFunctionStub(unsigned StubSize) {
- SavedCurBlock = CurBlock; SavedCurByte = CurByte;
- CurByte = CurBlock = MemMgr.allocateStub(StubSize);
-}
-
-void *Emitter::finishFunctionStub(const Function *F) {
- NumBytes += CurByte-CurBlock;
- std::swap(CurBlock, SavedCurBlock);
- CurByte = SavedCurByte;
- return SavedCurBlock;
-}
-
-void Emitter::emitByte(unsigned char B) {
- *CurByte++ = B; // Write the byte to memory
-}
+void JITEmitter::initJumpTableInfo(MachineJumpTableInfo *MJTI) {
+ const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
+ if (JT.empty()) return;
+
+ unsigned NumEntries = 0;
+ for (unsigned i = 0, e = JT.size(); i != e; ++i)
+ NumEntries += JT[i].MBBs.size();
-void Emitter::emitWord(unsigned W) {
- // 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);
-}
+ unsigned EntrySize = MJTI->getEntrySize();
-void Emitter::emitWordAt(unsigned W, unsigned *Ptr) {
- *Ptr = W;
+ // Just allocate space for all the jump tables now. We will fix up the actual
+ // MBB entries in the tables after we emit the code for each block, since then
+ // we will know the final locations of the MBBs in memory.
+ JumpTable = MJTI;
+ JumpTableBase = allocateSpace(NumEntries * EntrySize, MJTI->getAlignment());
}
-uint64_t Emitter::getGlobalValueAddress(GlobalValue *V) {
- // Try looking up the function to see if it is already compiled, if not return
- // 0.
- if (Function *F = dyn_cast<Function>(V)) {
- void *Addr = TheJIT->getPointerToGlobalIfAvailable(F);
- if (Addr == 0 && F->hasExternalLinkage()) {
- // Do not output stubs for external functions.
- Addr = TheJIT->getPointerToFunction(F);
+void JITEmitter::emitJumpTableInfo(MachineJumpTableInfo *MJTI) {
+ const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
+ if (JT.empty() || JumpTableBase == 0) return;
+
+ if (TargetMachine::getRelocationModel() == Reloc::PIC_) {
+ assert(MJTI->getEntrySize() == 4 && "Cross JIT'ing?");
+ // For each jump table, place the offset from the beginning of the table
+ // to the target address.
+ int *SlotPtr = (int*)JumpTableBase;
+
+ for (unsigned i = 0, e = JT.size(); i != e; ++i) {
+ const std::vector<MachineBasicBlock*> &MBBs = JT[i].MBBs;
+ // Store the offset of the basic block for this jump table slot in the
+ // memory we allocated for the jump table in 'initJumpTableInfo'
+ intptr_t Base = (intptr_t)SlotPtr;
+ for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi)
+ *SlotPtr++ = (intptr_t)getMachineBasicBlockAddress(MBBs[mi]) - Base;
}
- return (intptr_t)Addr;
} else {
- return (intptr_t)TheJIT->getOrEmitGlobalVariable(cast<GlobalVariable>(V));
+ assert(MJTI->getEntrySize() == sizeof(void*) && "Cross JIT'ing?");
+
+ // For each jump table, map each target in the jump table to the address of
+ // an emitted MachineBasicBlock.
+ intptr_t *SlotPtr = (intptr_t*)JumpTableBase;
+
+ for (unsigned i = 0, e = JT.size(); i != e; ++i) {
+ const std::vector<MachineBasicBlock*> &MBBs = JT[i].MBBs;
+ // Store the address of the basic block for this jump table slot in the
+ // memory we allocated for the jump table in 'initJumpTableInfo'
+ for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi)
+ *SlotPtr++ = getMachineBasicBlockAddress(MBBs[mi]);
+ }
}
}
-uint64_t Emitter::getGlobalValueAddress(const char *Name) {
- return (intptr_t)TheJIT->getPointerToNamedFunction(Name);
+
+void JITEmitter::startFunctionStub(unsigned StubSize, unsigned Alignment) {
+ SavedBufferBegin = BufferBegin;
+ SavedBufferEnd = BufferEnd;
+ SavedCurBufferPtr = CurBufferPtr;
+
+ BufferBegin = CurBufferPtr = MemMgr->allocateStub(StubSize, Alignment);
+ BufferEnd = BufferBegin+StubSize+1;
+}
+
+void *JITEmitter::finishFunctionStub(const Function *F) {
+ NumBytes += getCurrentPCOffset();
+ std::swap(SavedBufferBegin, BufferBegin);
+ BufferEnd = SavedBufferEnd;
+ CurBufferPtr = SavedCurBufferPtr;
+ return SavedBufferBegin;
}
// 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];
+intptr_t JITEmitter::getConstantPoolEntryAddress(unsigned ConstantNum) const {
+ assert(ConstantNum < ConstantPool->getConstants().size() &&
+ "Invalid ConstantPoolIndex!");
+ return (intptr_t)ConstantPoolBase +
+ ConstantPool->getConstants()[ConstantNum].Offset;
}
-// getCurrentPCValue - This returns the address that the next emitted byte
-// will be output to.
+// getJumpTableEntryAddress - Return the address of the JumpTable with index
+// 'Index' in the jumpp table that was last initialized with 'initJumpTableInfo'
//
-uint64_t Emitter::getCurrentPCValue() {
- return (intptr_t)CurByte;
+intptr_t JITEmitter::getJumpTableEntryAddress(unsigned Index) const {
+ const std::vector<MachineJumpTableEntry> &JT = JumpTable->getJumpTables();
+ assert(Index < JT.size() && "Invalid jump table index!");
+
+ unsigned Offset = 0;
+ unsigned EntrySize = JumpTable->getEntrySize();
+
+ for (unsigned i = 0; i < Index; ++i)
+ Offset += JT[i].MBBs.size();
+
+ Offset *= EntrySize;
+
+ return (intptr_t)((char *)JumpTableBase + Offset);
}
-uint64_t Emitter::getCurrentPCOffset() {
- return (intptr_t)CurByte-(intptr_t)CurBlock;
-}
+//===----------------------------------------------------------------------===//
+// Public interface to this file
+//===----------------------------------------------------------------------===//
-uint64_t Emitter::forceCompilationOf(Function *F) {
- return (intptr_t)TheJIT->getPointerToFunction(F);
+MachineCodeEmitter *JIT::createEmitter(JIT &jit, JITMemoryManager *JMM) {
+ return new JITEmitter(jit, JMM);
}
// getPointerToNamedFunction - This function is used as a global wrapper to
// resolve their addresses at runtime, and this is the way to do it.
extern "C" {
void *getPointerToNamedFunction(const char *Name) {
- Module &M = TheJIT->getModule();
- if (Function *F = M.getNamedFunction(Name))
+ if (Function *F = TheJIT->FindFunctionNamed(Name))
return TheJIT->getPointerToFunction(F);
return TheJIT->getPointerToNamedFunction(Name);
}
}
+
+// getPointerToFunctionOrStub - If the specified function has been
+// code-gen'd, return a pointer to the function. If not, compile it, or use
+// a stub to implement lazy compilation if available.
+//
+void *JIT::getPointerToFunctionOrStub(Function *F) {
+ // If we have already code generated the function, just return the address.
+ if (void *Addr = getPointerToGlobalIfAvailable(F))
+ return Addr;
+
+ // Get a stub if the target supports it.
+ assert(dynamic_cast<JITEmitter*>(MCE) && "Unexpected MCE?");
+ JITEmitter *JE = static_cast<JITEmitter*>(getCodeEmitter());
+ return JE->getJITResolver().getFunctionStub(F);
+}
+
+/// freeMachineCodeForFunction - release machine code memory for given Function.
+///
+void JIT::freeMachineCodeForFunction(Function *F) {
+ // Delete translation for this from the ExecutionEngine, so it will get
+ // retranslated next time it is used.
+ updateGlobalMapping(F, 0);
+
+ // Free the actual memory for the function body and related stuff.
+ assert(dynamic_cast<JITEmitter*>(MCE) && "Unexpected MCE?");
+ static_cast<JITEmitter*>(MCE)->deallocateMemForFunction(F);
+}
+
projects / oota-llvm.git / blobdiff