#include "llvm/System/Disassembler.h"
#include "llvm/System/Memory.h"
#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/ValueMap.h"
#include <algorithm>
#ifndef NDEBUG
#include <iomanip>
// JIT lazy compilation code.
//
namespace {
+ class JITEmitter;
+ class JITResolverState;
+
+ template<typename ValueTy>
+ struct NoRAUWValueMapConfig : public ValueMapConfig<ValueTy> {
+ typedef JITResolverState *ExtraData;
+ static void onRAUW(JITResolverState *, Value *Old, Value *New) {
+ assert(false && "The JIT doesn't know how to handle a"
+ " RAUW on a value it has emitted.");
+ }
+ };
+
+ struct CallSiteValueMapConfig : public NoRAUWValueMapConfig<Function*> {
+ typedef JITResolverState *ExtraData;
+ static void onDelete(JITResolverState *JRS, Function *F);
+ };
+
class JITResolverState {
public:
- typedef std::map<AssertingVH<Function>, void*> FunctionToStubMapTy;
- typedef std::map<void*, Function*> StubToFunctionMapTy;
+ typedef ValueMap<Function*, void*, NoRAUWValueMapConfig<Function*> >
+ FunctionToStubMapTy;
+ typedef std::map<void*, AssertingVH<Function> > CallSiteToFunctionMapTy;
+ typedef ValueMap<Function *, SmallPtrSet<void*, 1>,
+ CallSiteValueMapConfig> FunctionToCallSitesMapTy;
typedef std::map<AssertingVH<GlobalValue>, void*> GlobalToIndirectSymMapTy;
private:
/// FunctionToStubMap - Keep track of the stub created for a particular
/// function so that we can reuse them if necessary.
FunctionToStubMapTy FunctionToStubMap;
- /// StubToFunctionMap - Keep track of the function that each stub
- /// corresponds to.
- StubToFunctionMapTy StubToFunctionMap;
+ /// CallSiteToFunctionMap - Keep track of the function that each lazy call
+ /// site corresponds to, and vice versa.
+ CallSiteToFunctionMapTy CallSiteToFunctionMap;
+ FunctionToCallSitesMapTy FunctionToCallSitesMap;
/// GlobalToIndirectSymMap - Keep track of the indirect symbol created for a
/// particular GlobalVariable so that we can reuse them if necessary.
GlobalToIndirectSymMapTy GlobalToIndirectSymMap;
public:
+ JITResolverState() : FunctionToStubMap(this),
+ FunctionToCallSitesMap(this) {}
+
FunctionToStubMapTy& getFunctionToStubMap(const MutexGuard& locked) {
assert(locked.holds(TheJIT->lock));
return FunctionToStubMap;
}
- StubToFunctionMapTy& getStubToFunctionMap(const MutexGuard& locked) {
+ GlobalToIndirectSymMapTy& getGlobalToIndirectSymMap(const MutexGuard& locked) {
+ assert(locked.holds(TheJIT->lock));
+ return GlobalToIndirectSymMap;
+ }
+
+ pair<void *, Function *> LookupFunctionFromCallSite(
+ const MutexGuard &locked, void *CallSite) const {
assert(locked.holds(TheJIT->lock));
- return StubToFunctionMap;
+
+ // 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.
+ CallSiteToFunctionMapTy::const_iterator I =
+ CallSiteToFunctionMap.upper_bound(CallSite);
+ assert(I != CallSiteToFunctionMap.begin() &&
+ "This is not a known call site!");
+ --I;
+ return *I;
}
- GlobalToIndirectSymMapTy& getGlobalToIndirectSymMap(const MutexGuard& locked) {
+ void AddCallSite(const MutexGuard &locked, void *CallSite, Function *F) {
assert(locked.holds(TheJIT->lock));
- return GlobalToIndirectSymMap;
+
+ bool Inserted = CallSiteToFunctionMap.insert(
+ std::make_pair(CallSite, F)).second;
+ (void)Inserted;
+ assert(Inserted && "Pair was already in CallSiteToFunctionMap");
+ FunctionToCallSitesMap[F].insert(CallSite);
+ }
+
+ // Returns the Function of the stub if a stub was erased, or NULL if there
+ // was no stub. This function uses the call-site->function map to find a
+ // relevant function, but asserts that only stubs and not other call sites
+ // will be passed in.
+ Function *EraseStub(const MutexGuard &locked, void *Stub) {
+ CallSiteToFunctionMapTy::iterator C2F_I =
+ CallSiteToFunctionMap.find(Stub);
+ if (C2F_I == CallSiteToFunctionMap.end()) {
+ // Not a stub.
+ return NULL;
+ }
+
+ Function *const F = C2F_I->second;
+#ifndef NDEBUG
+ void *RealStub = FunctionToStubMap.lookup(F);
+ assert(RealStub == Stub &&
+ "Call-site that wasn't a stub pass in to EraseStub");
+#endif
+ FunctionToStubMap.erase(F);
+ CallSiteToFunctionMap.erase(C2F_I);
+
+ // Remove the stub from the function->call-sites map, and remove the whole
+ // entry from the map if that was the last call site.
+ FunctionToCallSitesMapTy::iterator F2C_I = FunctionToCallSitesMap.find(F);
+ assert(F2C_I != FunctionToCallSitesMap.end() &&
+ "FunctionToCallSitesMap broken");
+ bool Erased = F2C_I->second.erase(Stub);
+ (void)Erased;
+ assert(Erased && "FunctionToCallSitesMap broken");
+ if (F2C_I->second.empty())
+ FunctionToCallSitesMap.erase(F2C_I);
+
+ return F;
+ }
+
+ void EraseAllCallSites(const MutexGuard &locked, Function *F) {
+ assert(locked.holds(TheJIT->lock));
+ EraseAllCallSitesPrelocked(F);
+ }
+ void EraseAllCallSitesPrelocked(Function *F) {
+ FunctionToCallSitesMapTy::iterator F2C = FunctionToCallSitesMap.find(F);
+ if (F2C == FunctionToCallSitesMap.end())
+ return;
+ for (SmallPtrSet<void*, 1>::const_iterator I = F2C->second.begin(),
+ E = F2C->second.end(); I != E; ++I) {
+ bool Erased = CallSiteToFunctionMap.erase(*I);
+ (void)Erased;
+ assert(Erased && "Missing call site->function mapping");
+ }
+ FunctionToCallSitesMap.erase(F2C);
}
};
/// have not yet been compiled.
class JITResolver {
typedef JITResolverState::FunctionToStubMapTy FunctionToStubMapTy;
- typedef JITResolverState::StubToFunctionMapTy StubToFunctionMapTy;
+ typedef JITResolverState::CallSiteToFunctionMapTy CallSiteToFunctionMapTy;
typedef JITResolverState::GlobalToIndirectSymMapTy GlobalToIndirectSymMapTy;
/// LazyResolverFn - The target lazy resolver function that we actually
std::map<void*, unsigned> revGOTMap;
unsigned nextGOTIndex;
+ JITEmitter &JE;
+
static JITResolver *TheJITResolver;
public:
- explicit JITResolver(JIT &jit) : nextGOTIndex(0) {
+ explicit JITResolver(JIT &jit, JITEmitter &je) : nextGOTIndex(0), JE(je) {
TheJIT = &jit;
LazyResolverFn = jit.getJITInfo().getLazyResolverFunction(JITCompilerFn);
assert(TheJITResolver == 0 && "Multiple JIT resolvers?");
TheJITResolver = this;
}
-
+
~JITResolver() {
TheJITResolver = 0;
}
void *AddCallbackAtLocation(Function *F, void *Location) {
MutexGuard locked(TheJIT->lock);
/// Get the target-specific JIT resolver function.
- state.getStubToFunctionMap(locked)[Location] = F;
+ state.AddCallSite(locked, Location, F);
return (void*)(intptr_t)LazyResolverFn;
}
-
+
void getRelocatableGVs(SmallVectorImpl<GlobalValue*> &GVs,
SmallVectorImpl<void*> &Ptrs);
-
+
GlobalValue *invalidateStub(void *Stub);
/// getGOTIndexForAddress - Return a new or existing index in the GOT for
/// been compiled, this function compiles it first.
static void *JITCompilerFn(void *Stub);
};
+
+ /// JITEmitter - The JIT implementation of the MachineCodeEmitter, which is
+ /// used to output functions to memory for execution.
+ class JITEmitter : public JITCodeEmitter {
+ JITMemoryManager *MemMgr;
+
+ // When outputting a function stub in the context of some other function, we
+ // save BufferBegin/BufferEnd/CurBufferPtr here.
+ uint8_t *SavedBufferBegin, *SavedBufferEnd, *SavedCurBufferPtr;
+
+ // When reattempting to JIT a function after running out of space, we store
+ // the estimated size of the function we're trying to JIT here, so we can
+ // ask the memory manager for at least this much space. When we
+ // successfully emit the function, we reset this back to zero.
+ uintptr_t SizeEstimate;
+
+ /// 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<uintptr_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;
+
+ /// ConstPoolAddresses - Addresses of individual constant pool entries.
+ ///
+ SmallVector<uintptr_t, 8> ConstPoolAddresses;
+
+ /// 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;
+
+ /// DE - The dwarf emitter for the jit.
+ OwningPtr<JITDwarfEmitter> DE;
+
+ /// DR - The debug registerer for the jit.
+ OwningPtr<JITDebugRegisterer> DR;
+
+ /// LabelLocations - This vector is a mapping from Label ID's to their
+ /// address.
+ std::vector<uintptr_t> LabelLocations;
+
+ /// MMI - Machine module info for exception informations
+ MachineModuleInfo* MMI;
+
+ // GVSet - a set to keep track of which globals have been seen
+ SmallPtrSet<const GlobalVariable*, 8> GVSet;
+
+ // CurFn - The llvm function being emitted. Only valid during
+ // finishFunction().
+ const Function *CurFn;
+
+ /// Information about emitted code, which is passed to the
+ /// JITEventListeners. This is reset in startFunction and used in
+ /// finishFunction.
+ JITEvent_EmittedFunctionDetails EmissionDetails;
+
+ struct EmittedCode {
+ void *FunctionBody; // Beginning of the function's allocation.
+ void *Code; // The address the function's code actually starts at.
+ void *ExceptionTable;
+ EmittedCode() : FunctionBody(0), Code(0), ExceptionTable(0) {}
+ };
+ struct EmittedFunctionConfig : public ValueMapConfig<const Function*> {
+ typedef JITEmitter *ExtraData;
+ static void onDelete(JITEmitter *, const Function*);
+ static void onRAUW(JITEmitter *, const Function*, const Function*);
+ };
+ ValueMap<const Function *, EmittedCode,
+ EmittedFunctionConfig> EmittedFunctions;
+
+ // CurFnStubUses - For a given Function, a vector of stubs that it
+ // references. This facilitates the JIT detecting that a stub is no
+ // longer used, so that it may be deallocated.
+ DenseMap<AssertingVH<const Function>, SmallVector<void*, 1> > CurFnStubUses;
+
+ // StubFnRefs - For a given pointer to a stub, a set of Functions which
+ // reference the stub. When the count of a stub's references drops to zero,
+ // the stub is unused.
+ DenseMap<void *, SmallPtrSet<const Function*, 1> > StubFnRefs;
+
+ DebugLocTuple PrevDLT;
+
+ public:
+ JITEmitter(JIT &jit, JITMemoryManager *JMM, TargetMachine &TM)
+ : SizeEstimate(0), Resolver(jit, *this), MMI(0), CurFn(0),
+ EmittedFunctions(this) {
+ MemMgr = JMM ? JMM : JITMemoryManager::CreateDefaultMemManager();
+ if (jit.getJITInfo().needsGOT()) {
+ MemMgr->AllocateGOT();
+ DEBUG(errs() << "JIT is managing a GOT\n");
+ }
+
+ if (DwarfExceptionHandling || JITEmitDebugInfo) {
+ DE.reset(new JITDwarfEmitter(jit));
+ }
+ if (JITEmitDebugInfo) {
+ DR.reset(new JITDebugRegisterer(TM));
+ }
+ }
+ ~JITEmitter() {
+ delete MemMgr;
+ }
+
+ /// classof - Methods for support type inquiry through isa, cast, and
+ /// dyn_cast:
+ ///
+ static inline bool classof(const JITEmitter*) { return true; }
+ static inline bool classof(const MachineCodeEmitter*) { return true; }
+
+ JITResolver &getJITResolver() { return Resolver; }
+
+ virtual void startFunction(MachineFunction &F);
+ virtual bool finishFunction(MachineFunction &F);
+
+ void emitConstantPool(MachineConstantPool *MCP);
+ void initJumpTableInfo(MachineJumpTableInfo *MJTI);
+ void emitJumpTableInfo(MachineJumpTableInfo *MJTI);
+
+ virtual void startGVStub(const GlobalValue* GV, unsigned StubSize,
+ unsigned Alignment = 1);
+ virtual void startGVStub(const GlobalValue* GV, void *Buffer,
+ unsigned StubSize);
+ virtual void* finishGVStub(const GlobalValue *GV);
+
+ /// allocateSpace - Reserves space in the current block if any, or
+ /// allocate a new one of the given size.
+ virtual void *allocateSpace(uintptr_t Size, unsigned Alignment);
+
+ /// allocateGlobal - Allocate memory for a global. Unlike allocateSpace,
+ /// this method does not allocate memory in the current output buffer,
+ /// because a global may live longer than the current function.
+ virtual void *allocateGlobal(uintptr_t Size, unsigned Alignment);
+
+ 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();
+ DEBUG(errs() << "JIT: Emitting BB" << MBB->getNumber() << " at ["
+ << (void*) getCurrentPCValue() << "]\n");
+ }
+
+ virtual uintptr_t getConstantPoolEntryAddress(unsigned Entry) const;
+ virtual uintptr_t getJumpTableEntryAddress(unsigned Entry) const;
+
+ virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
+ assert(MBBLocations.size() > (unsigned)MBB->getNumber() &&
+ MBBLocations[MBB->getNumber()] && "MBB not emitted!");
+ return MBBLocations[MBB->getNumber()];
+ }
+
+ /// retryWithMoreMemory - Log a retry and deallocate all memory for the
+ /// given function. Increase the minimum allocation size so that we get
+ /// more memory next time.
+ void retryWithMoreMemory(MachineFunction &F);
+
+ /// deallocateMemForFunction - Deallocate all memory for the specified
+ /// function body.
+ void deallocateMemForFunction(const Function *F);
+
+ /// AddStubToCurrentFunction - Mark the current function being JIT'd as
+ /// using the stub at the specified address. Allows
+ /// deallocateMemForFunction to also remove stubs no longer referenced.
+ void AddStubToCurrentFunction(void *Stub);
+
+ virtual void processDebugLoc(DebugLoc DL, bool BeforePrintingInsn);
+
+ virtual void emitLabel(uint64_t LabelID) {
+ if (LabelLocations.size() <= LabelID)
+ LabelLocations.resize((LabelID+1)*2);
+ LabelLocations[LabelID] = getCurrentPCValue();
+ }
+
+ virtual uintptr_t getLabelAddress(uint64_t LabelID) const {
+ assert(LabelLocations.size() > (unsigned)LabelID &&
+ LabelLocations[LabelID] && "Label not emitted!");
+ return LabelLocations[LabelID];
+ }
+
+ virtual void setModuleInfo(MachineModuleInfo* Info) {
+ MMI = Info;
+ if (DE.get()) DE->setModuleInfo(Info);
+ }
+
+ void setMemoryExecutable() {
+ MemMgr->setMemoryExecutable();
+ }
+
+ JITMemoryManager *getMemMgr() const { return MemMgr; }
+
+ private:
+ void *getPointerToGlobal(GlobalValue *GV, void *Reference,
+ bool MayNeedFarStub);
+ void *getPointerToGVIndirectSym(GlobalValue *V, void *Reference);
+ unsigned addSizeOfGlobal(const GlobalVariable *GV, unsigned Size);
+ unsigned addSizeOfGlobalsInConstantVal(const Constant *C, unsigned Size);
+ unsigned addSizeOfGlobalsInInitializer(const Constant *Init, unsigned Size);
+ unsigned GetSizeOfGlobalsInBytes(MachineFunction &MF);
+ };
}
JITResolver *JITResolver::TheJITResolver = 0;
+void CallSiteValueMapConfig::onDelete(JITResolverState *JRS, Function *F) {
+ JRS->EraseAllCallSitesPrelocked(F);
+}
+
/// getFunctionStubIfAvailable - This returns a pointer to a function stub
/// if it has already been created.
void *JITResolver::getFunctionStubIfAvailable(Function *F) {
MutexGuard locked(TheJIT->lock);
// If we already have a stub for this function, recycle it.
- void *&Stub = state.getFunctionToStubMap(locked)[F];
- return Stub;
+ return state.getFunctionToStubMap(locked).lookup(F);
}
/// getFunctionStub - This returns a pointer to a function stub, creating
void *&Stub = state.getFunctionToStubMap(locked)[F];
if (Stub) return Stub;
- // Call the lazy resolver function unless we are JIT'ing non-lazily, in which
- // case we must resolve the symbol now.
- void *Actual = TheJIT->isLazyCompilationDisabled()
- ? (void *)0 : (void *)(intptr_t)LazyResolverFn;
-
+ // Call the lazy resolver function if we are JIT'ing lazily. Otherwise we
+ // must resolve the symbol now.
+ void *Actual = TheJIT->isCompilingLazily()
+ ? (void *)(intptr_t)LazyResolverFn : (void *)0;
+
// If this is an external declaration, attempt to resolve the address now
// to place in the stub.
if (F->isDeclaration() && !F->hasNotBeenReadFromBitcode()) {
Actual = TheJIT->getPointerToFunction(F);
// If we resolved the symbol to a null address (eg. a weak external)
- // don't emit a stub. Return a null pointer to the application. If dlsym
- // stubs are enabled, not being able to resolve the address is not
- // meaningful.
- if (!Actual && !TheJIT->areDlsymStubsEnabled()) return 0;
+ // don't emit a stub. Return a null pointer to the application.
+ if (!Actual) return 0;
}
// Codegen a new stub, calling the lazy resolver or the actual address of the
// external function, if it was resolved.
- Stub = TheJIT->getJITInfo().emitFunctionStub(F, Actual,
- *TheJIT->getCodeEmitter());
+ Stub = TheJIT->getJITInfo().emitFunctionStub(F, Actual, JE);
if (Actual != (void*)(intptr_t)LazyResolverFn) {
// If we are getting the stub for an external function, we really want the
// Finally, keep track of the stub-to-Function mapping so that the
// JITCompilerFn knows which function to compile!
- state.getStubToFunctionMap(locked)[Stub] = F;
-
+ state.AddCallSite(locked, Stub, F);
+
// If we are JIT'ing non-lazily but need to call a function that does not
// exist yet, add it to the JIT's work list so that we can fill in the stub
// address later.
- if (!Actual && TheJIT->isLazyCompilationDisabled())
+ if (!Actual && !TheJIT->isCompilingLazily())
if (!F->isDeclaration() || F->hasNotBeenReadFromBitcode())
TheJIT->addPendingFunction(F);
-
+
return Stub;
}
// Otherwise, codegen a new indirect symbol.
IndirectSym = TheJIT->getJITInfo().emitGlobalValueIndirectSym(GV, GVAddress,
- *TheJIT->getCodeEmitter());
+ JE);
- DEBUG(errs() << "JIT: Indirect symbol emitted at [" << IndirectSym
+ DEBUG(errs() << "JIT: Indirect symbol emitted at [" << IndirectSym
<< "] for GV '" << GV->getName() << "'\n");
return IndirectSym;
void *&Stub = ExternalFnToStubMap[FnAddr];
if (Stub) return Stub;
- Stub = TheJIT->getJITInfo().emitFunctionStub(0, FnAddr,
- *TheJIT->getCodeEmitter());
+ Stub = TheJIT->getJITInfo().emitFunctionStub(0, FnAddr, JE);
DEBUG(errs() << "JIT: Stub emitted at [" << Stub
<< "] for external function at '" << FnAddr << "'\n");
void JITResolver::getRelocatableGVs(SmallVectorImpl<GlobalValue*> &GVs,
SmallVectorImpl<void*> &Ptrs) {
MutexGuard locked(TheJIT->lock);
-
- FunctionToStubMapTy &FM = state.getFunctionToStubMap(locked);
+
+ const FunctionToStubMapTy &FM = state.getFunctionToStubMap(locked);
GlobalToIndirectSymMapTy &GM = state.getGlobalToIndirectSymMap(locked);
-
- for (FunctionToStubMapTy::iterator i = FM.begin(), e = FM.end(); i != e; ++i){
+
+ for (FunctionToStubMapTy::const_iterator i = FM.begin(), e = FM.end();
+ i != e; ++i){
Function *F = i->first;
if (F->isDeclaration() && F->hasExternalLinkage()) {
GVs.push_back(i->first);
GlobalValue *JITResolver::invalidateStub(void *Stub) {
MutexGuard locked(TheJIT->lock);
-
- FunctionToStubMapTy &FM = state.getFunctionToStubMap(locked);
- StubToFunctionMapTy &SM = state.getStubToFunctionMap(locked);
+
GlobalToIndirectSymMapTy &GM = state.getGlobalToIndirectSymMap(locked);
-
+
// Look up the cheap way first, to see if it's a function stub we are
// invalidating. If so, remove it from both the forward and reverse maps.
- if (SM.find(Stub) != SM.end()) {
- Function *F = SM[Stub];
- SM.erase(Stub);
- FM.erase(F);
+ if (Function *F = state.EraseStub(locked, Stub)) {
return F;
}
-
+
// Otherwise, it might be an indirect symbol stub. Find it and remove it.
for (GlobalToIndirectSymMapTy::iterator i = GM.begin(), e = GM.end();
i != e; ++i) {
GM.erase(i);
return GV;
}
-
+
// Lastly, check to see if it's in the ExternalFnToStubMap.
for (std::map<void *, void *>::iterator i = ExternalFnToStubMap.begin(),
e = ExternalFnToStubMap.end(); i != e; ++i) {
ExternalFnToStubMap.erase(i);
break;
}
-
+
return 0;
}
/// it if necessary, then returns the resultant function pointer.
void *JITResolver::JITCompilerFn(void *Stub) {
JITResolver &JR = *TheJITResolver;
-
+
Function* F = 0;
void* ActualPtr = 0;
// JIT lock to be unlocked.
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.
- StubToFunctionMapTy::iterator I =
- JR.state.getStubToFunctionMap(locked).upper_bound(Stub);
- assert(I != JR.state.getStubToFunctionMap(locked).begin() &&
- "This is not a known stub!");
- F = (--I)->second;
- ActualPtr = I->first;
+ // 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.
+ pair<void*, Function*> I =
+ JR.state.LookupFunctionFromCallSite(locked, Stub);
+ F = I.second;
+ ActualPtr = I.first;
}
// 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()) {
+ if (!TheJIT->isCompilingLazily()) {
llvm_report_error("LLVM JIT requested to do lazy compilation of function '"
+ F->getName() + "' when lazy compiles are disabled!");
}
-
- // 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);
DEBUG(errs() << "JIT: Lazily resolving function '" << F->getName()
<< "' In stub ptr = " << Stub << " actual ptr = "
Result = TheJIT->getPointerToFunction(F);
}
-
- // Reacquire the lock to erase the stub in the map.
+
+ // Reacquire the lock to update the GOT map.
MutexGuard locked(TheJIT->lock);
- // We don't need to reuse this stub in the future, as F is now compiled.
- JR.state.getFunctionToStubMap(locked).erase(F);
+ // We might like to remove the call site from the CallSiteToFunction map, but
+ // 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.
// FIXME: We could rewrite all references to this stub if we knew them.
//===----------------------------------------------------------------------===//
// JITEmitter code.
//
-namespace {
- /// JITEmitter - The JIT implementation of the MachineCodeEmitter, which is
- /// used to output functions to memory for execution.
- class JITEmitter : public JITCodeEmitter {
- JITMemoryManager *MemMgr;
-
- // When outputting a function stub in the context of some other function, we
- // save BufferBegin/BufferEnd/CurBufferPtr here.
- uint8_t *SavedBufferBegin, *SavedBufferEnd, *SavedCurBufferPtr;
-
- // When reattempting to JIT a function after running out of space, we store
- // the estimated size of the function we're trying to JIT here, so we can
- // ask the memory manager for at least this much space. When we
- // successfully emit the function, we reset this back to zero.
- uintptr_t SizeEstimate;
-
- /// 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<uintptr_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;
-
- /// ConstPoolAddresses - Addresses of individual constant pool entries.
- ///
- SmallVector<uintptr_t, 8> ConstPoolAddresses;
-
- /// 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;
-
- /// DE - The dwarf emitter for the jit.
- OwningPtr<JITDwarfEmitter> DE;
-
- /// DR - The debug registerer for the jit.
- OwningPtr<JITDebugRegisterer> DR;
-
- /// LabelLocations - This vector is a mapping from Label ID's to their
- /// address.
- std::vector<uintptr_t> LabelLocations;
-
- /// MMI - Machine module info for exception informations
- MachineModuleInfo* MMI;
-
- // GVSet - a set to keep track of which globals have been seen
- SmallPtrSet<const GlobalVariable*, 8> GVSet;
-
- // CurFn - The llvm function being emitted. Only valid during
- // finishFunction().
- const Function *CurFn;
-
- /// Information about emitted code, which is passed to the
- /// JITEventListeners. This is reset in startFunction and used in
- /// finishFunction.
- JITEvent_EmittedFunctionDetails EmissionDetails;
-
- // CurFnStubUses - For a given Function, a vector of stubs that it
- // references. This facilitates the JIT detecting that a stub is no
- // longer used, so that it may be deallocated.
- DenseMap<const Function *, SmallVector<void*, 1> > CurFnStubUses;
-
- // StubFnRefs - For a given pointer to a stub, a set of Functions which
- // reference the stub. When the count of a stub's references drops to zero,
- // the stub is unused.
- DenseMap<void *, SmallPtrSet<const Function*, 1> > StubFnRefs;
-
- // ExtFnStubs - A map of external function names to stubs which have entries
- // in the JITResolver's ExternalFnToStubMap.
- StringMap<void *> ExtFnStubs;
-
- DebugLocTuple PrevDLT;
-
- public:
- JITEmitter(JIT &jit, JITMemoryManager *JMM, TargetMachine &TM)
- : SizeEstimate(0), Resolver(jit), MMI(0), CurFn(0) {
- MemMgr = JMM ? JMM : JITMemoryManager::CreateDefaultMemManager();
- if (jit.getJITInfo().needsGOT()) {
- MemMgr->AllocateGOT();
- DEBUG(errs() << "JIT is managing a GOT\n");
- }
-
- if (DwarfExceptionHandling || JITEmitDebugInfo) {
- DE.reset(new JITDwarfEmitter(jit));
- }
- if (JITEmitDebugInfo) {
- DR.reset(new JITDebugRegisterer(TM));
- }
- }
- ~JITEmitter() {
- delete MemMgr;
- }
-
- /// classof - Methods for support type inquiry through isa, cast, and
- /// dyn_cast:
- ///
- static inline bool classof(const JITEmitter*) { return true; }
- static inline bool classof(const MachineCodeEmitter*) { return true; }
-
- JITResolver &getJITResolver() { return Resolver; }
-
- virtual void startFunction(MachineFunction &F);
- virtual bool finishFunction(MachineFunction &F);
-
- void emitConstantPool(MachineConstantPool *MCP);
- void initJumpTableInfo(MachineJumpTableInfo *MJTI);
- void emitJumpTableInfo(MachineJumpTableInfo *MJTI);
-
- virtual void startGVStub(const GlobalValue* GV, unsigned StubSize,
- unsigned Alignment = 1);
- virtual void startGVStub(const GlobalValue* GV, void *Buffer,
- unsigned StubSize);
- virtual void* finishGVStub(const GlobalValue *GV);
-
- /// allocateSpace - Reserves space in the current block if any, or
- /// allocate a new one of the given size.
- virtual void *allocateSpace(uintptr_t Size, unsigned Alignment);
-
- /// allocateGlobal - Allocate memory for a global. Unlike allocateSpace,
- /// this method does not allocate memory in the current output buffer,
- /// because a global may live longer than the current function.
- virtual void *allocateGlobal(uintptr_t Size, unsigned Alignment);
-
- 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();
- DEBUG(errs() << "JIT: Emitting BB" << MBB->getNumber() << " at ["
- << (void*) getCurrentPCValue() << "]\n");
- }
-
- virtual uintptr_t getConstantPoolEntryAddress(unsigned Entry) const;
- virtual uintptr_t getJumpTableEntryAddress(unsigned Entry) const;
-
- virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
- assert(MBBLocations.size() > (unsigned)MBB->getNumber() &&
- MBBLocations[MBB->getNumber()] && "MBB not emitted!");
- return MBBLocations[MBB->getNumber()];
- }
-
- /// retryWithMoreMemory - Log a retry and deallocate all memory for the
- /// given function. Increase the minimum allocation size so that we get
- /// more memory next time.
- void retryWithMoreMemory(MachineFunction &F);
-
- /// deallocateMemForFunction - Deallocate all memory for the specified
- /// function body.
- void deallocateMemForFunction(const Function *F);
-
- /// AddStubToCurrentFunction - Mark the current function being JIT'd as
- /// using the stub at the specified address. Allows
- /// deallocateMemForFunction to also remove stubs no longer referenced.
- void AddStubToCurrentFunction(void *Stub);
-
- /// getExternalFnStubs - Accessor for the JIT to find stubs emitted for
- /// MachineRelocations that reference external functions by name.
- const StringMap<void*> &getExternalFnStubs() const { return ExtFnStubs; }
-
- virtual void processDebugLoc(DebugLoc DL);
-
- virtual void emitLabel(uint64_t LabelID) {
- if (LabelLocations.size() <= LabelID)
- LabelLocations.resize((LabelID+1)*2);
- LabelLocations[LabelID] = getCurrentPCValue();
- }
-
- virtual uintptr_t getLabelAddress(uint64_t LabelID) const {
- assert(LabelLocations.size() > (unsigned)LabelID &&
- LabelLocations[LabelID] && "Label not emitted!");
- return LabelLocations[LabelID];
- }
-
- virtual void setModuleInfo(MachineModuleInfo* Info) {
- MMI = Info;
- if (DE.get()) DE->setModuleInfo(Info);
- }
-
- void setMemoryExecutable() {
- MemMgr->setMemoryExecutable();
- }
-
- JITMemoryManager *getMemMgr() const { return MemMgr; }
-
- private:
- void *getPointerToGlobal(GlobalValue *GV, void *Reference, bool NoNeedStub);
- void *getPointerToGVIndirectSym(GlobalValue *V, void *Reference,
- bool NoNeedStub);
- unsigned addSizeOfGlobal(const GlobalVariable *GV, unsigned Size);
- unsigned addSizeOfGlobalsInConstantVal(const Constant *C, unsigned Size);
- unsigned addSizeOfGlobalsInInitializer(const Constant *Init, unsigned Size);
- unsigned GetSizeOfGlobalsInBytes(MachineFunction &MF);
- };
-}
-
void *JITEmitter::getPointerToGlobal(GlobalValue *V, void *Reference,
- bool DoesntNeedStub) {
+ bool MayNeedFarStub) {
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V))
return TheJIT->getOrEmitGlobalVariable(GV);
// If we have already compiled the function, return a pointer to its body.
Function *F = cast<Function>(V);
- void *ResultPtr;
- if (!DoesntNeedStub && !TheJIT->isLazyCompilationDisabled()) {
- // Return the function stub if it's already created.
- ResultPtr = Resolver.getFunctionStubIfAvailable(F);
- if (ResultPtr)
- AddStubToCurrentFunction(ResultPtr);
- } else {
- ResultPtr = TheJIT->getPointerToGlobalIfAvailable(F);
+
+ void *FnStub = Resolver.getFunctionStubIfAvailable(F);
+ if (FnStub) {
+ // Return the function stub if it's already created. We do this first
+ // so that we're returning the same address for the function as any
+ // previous call.
+ AddStubToCurrentFunction(FnStub);
+ return FnStub;
}
+
+ // Otherwise if we have code, go ahead and return that.
+ void *ResultPtr = TheJIT->getPointerToGlobalIfAvailable(F);
if (ResultPtr) return ResultPtr;
// If this is an external function pointer, we can force the JIT to
- // 'compile' it, which really just adds it to the map. In dlsym mode,
- // external functions are forced through a stub, regardless of reloc type.
+ // 'compile' it, which really just adds it to the map.
if (F->isDeclaration() && !F->hasNotBeenReadFromBitcode() &&
- DoesntNeedStub && !TheJIT->areDlsymStubsEnabled())
+ !MayNeedFarStub)
return TheJIT->getPointerToFunction(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. This uses the lazy resolver, so is not
// legal if lazy compilation is disabled.
- if (DoesntNeedStub && !TheJIT->isLazyCompilationDisabled())
+ if (!MayNeedFarStub && TheJIT->isCompilingLazily())
return Resolver.AddCallbackAtLocation(F, Reference);
// Otherwise, we have to emit a stub.
return StubAddr;
}
-void *JITEmitter::getPointerToGVIndirectSym(GlobalValue *V, void *Reference,
- bool NoNeedStub) {
+void *JITEmitter::getPointerToGVIndirectSym(GlobalValue *V, void *Reference) {
// Make sure GV is emitted first, and create a stub containing the fully
// resolved address.
- void *GVAddress = getPointerToGlobal(V, Reference, true);
+ void *GVAddress = getPointerToGlobal(V, Reference, false);
void *StubAddr = Resolver.getGlobalValueIndirectSym(V, GVAddress);
-
+
// Add the stub to the current function's list of referenced stubs, so we can
// deallocate them if the current function is ever freed.
AddStubToCurrentFunction(StubAddr);
-
+
return StubAddr;
}
void JITEmitter::AddStubToCurrentFunction(void *StubAddr) {
- if (!TheJIT->areDlsymStubsEnabled())
- return;
-
assert(CurFn && "Stub added to current function, but current function is 0!");
-
+
SmallVectorImpl<void*> &StubsUsed = CurFnStubUses[CurFn];
StubsUsed.push_back(StubAddr);
FnRefs.insert(CurFn);
}
-void JITEmitter::processDebugLoc(DebugLoc DL) {
+void JITEmitter::processDebugLoc(DebugLoc DL, bool BeforePrintingInsn) {
if (!DL.isUnknown()) {
DebugLocTuple CurDLT = EmissionDetails.MF->getDebugLocTuple(DL);
- if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT) {
- JITEvent_EmittedFunctionDetails::LineStart NextLine;
- NextLine.Address = getCurrentPCValue();
- NextLine.Loc = DL;
- EmissionDetails.LineStarts.push_back(NextLine);
- }
+ if (BeforePrintingInsn) {
+ if (CurDLT.Scope != 0 && PrevDLT != CurDLT) {
+ JITEvent_EmittedFunctionDetails::LineStart NextLine;
+ NextLine.Address = getCurrentPCValue();
+ NextLine.Loc = DL;
+ EmissionDetails.LineStarts.push_back(NextLine);
+ }
- PrevDLT = CurDLT;
+ PrevDLT = CurDLT;
+ }
}
}
static unsigned GetJumpTableSizeInBytes(MachineJumpTableInfo *MJTI) {
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
if (JT.empty()) return 0;
-
+
unsigned NumEntries = 0;
for (unsigned i = 0, e = JT.size(); i != e; ++i)
NumEntries += JT[i].MBBs.size();
static uintptr_t RoundUpToAlign(uintptr_t Size, unsigned Alignment) {
if (Alignment == 0) Alignment = 1;
- // Since we do not know where the buffer will be allocated, be pessimistic.
+ // Since we do not know where the buffer will be allocated, be pessimistic.
return Size + Alignment;
}
unsigned JITEmitter::addSizeOfGlobal(const GlobalVariable *GV, unsigned Size) {
const Type *ElTy = GV->getType()->getElementType();
size_t GVSize = (size_t)TheJIT->getTargetData()->getTypeAllocSize(ElTy);
- size_t GVAlign =
+ size_t GVAlign =
(size_t)TheJIT->getTargetData()->getPreferredAlignment(GV);
DEBUG(errs() << "JIT: Adding in size " << GVSize << " alignment " << GVAlign);
DEBUG(GV->dump());
/// but are referenced from the constant; put them in GVSet and add their
/// size into the running total Size.
-unsigned JITEmitter::addSizeOfGlobalsInConstantVal(const Constant *C,
+unsigned JITEmitter::addSizeOfGlobalsInConstantVal(const Constant *C,
unsigned Size) {
// If its undefined, return the garbage.
if (isa<UndefValue>(C))
/// addSizeOfGLobalsInInitializer - handle any globals that we haven't seen yet
/// but are referenced from the given initializer.
-unsigned JITEmitter::addSizeOfGlobalsInInitializer(const Constant *Init,
+unsigned JITEmitter::addSizeOfGlobalsInInitializer(const Constant *Init,
unsigned Size) {
if (!isa<UndefValue>(Init) &&
!isa<ConstantVector>(Init) &&
unsigned Size = 0;
GVSet.clear();
- for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
+ for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
MBB != E; ++MBB) {
for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
I != E; ++I) {
DEBUG(errs() << "JIT: About to look through initializers\n");
// Look for more globals that are referenced only from initializers.
// GVSet.end is computed each time because the set can grow as we go.
- for (SmallPtrSet<const GlobalVariable *, 8>::iterator I = GVSet.begin();
+ for (SmallPtrSet<const GlobalVariable *, 8>::iterator I = GVSet.begin();
I != GVSet.end(); I++) {
const GlobalVariable* GV = *I;
if (GV->hasInitializer())
const TargetInstrInfo* TII = F.getTarget().getInstrInfo();
MachineJumpTableInfo *MJTI = F.getJumpTableInfo();
MachineConstantPool *MCP = F.getConstantPool();
-
+
// Ensure the constant pool/jump table info is at least 4-byte aligned.
ActualSize = RoundUpToAlign(ActualSize, 16);
-
+
// Add the alignment of the constant pool
ActualSize = RoundUpToAlign(ActualSize, MCP->getConstantPoolAlignment());
// Add the jump table size
ActualSize += GetJumpTableSizeInBytes(MJTI);
-
+
// Add the alignment for the function
ActualSize = RoundUpToAlign(ActualSize,
std::max(F.getFunction()->getAlignment(), 8U));
BufferBegin = CurBufferPtr = MemMgr->startFunctionBody(F.getFunction(),
ActualSize);
BufferEnd = BufferBegin+ActualSize;
-
+ EmittedFunctions[F.getFunction()].FunctionBody = BufferBegin;
+
// Ensure the constant pool/jump table info is at least 4-byte aligned.
emitAlignment(16);
// About to start emitting the machine code for the function.
emitAlignment(std::max(F.getFunction()->getAlignment(), 8U));
TheJIT->updateGlobalMapping(F.getFunction(), CurBufferPtr);
+ EmittedFunctions[F.getFunction()].Code = CurBufferPtr;
MBBLocations.clear();
ResultPtr = TheJIT->getPointerToNamedFunction(MR.getExternalSymbol(),
false);
DEBUG(errs() << "JIT: Map \'" << MR.getExternalSymbol() << "\' to ["
- << ResultPtr << "]\n");
+ << ResultPtr << "]\n");
// If the target REALLY wants a stub for this function, emit it now.
- if (!MR.doesntNeedStub()) {
- if (!TheJIT->areDlsymStubsEnabled()) {
- ResultPtr = Resolver.getExternalFunctionStub(ResultPtr);
- } else {
- void *&Stub = ExtFnStubs[MR.getExternalSymbol()];
- if (!Stub) {
- Stub = Resolver.getExternalFunctionStub((void *)&Stub);
- AddStubToCurrentFunction(Stub);
- }
- ResultPtr = Stub;
- }
+ if (MR.mayNeedFarStub()) {
+ ResultPtr = Resolver.getExternalFunctionStub(ResultPtr);
}
} else if (MR.isGlobalValue()) {
ResultPtr = getPointerToGlobal(MR.getGlobalValue(),
BufferBegin+MR.getMachineCodeOffset(),
- MR.doesntNeedStub());
+ MR.mayNeedFarStub());
} else if (MR.isIndirectSymbol()) {
- ResultPtr = getPointerToGVIndirectSym(MR.getGlobalValue(),
- BufferBegin+MR.getMachineCodeOffset(),
- MR.doesntNeedStub());
+ ResultPtr = getPointerToGVIndirectSym(
+ MR.getGlobalValue(), BufferBegin+MR.getMachineCodeOffset());
} else if (MR.isBasicBlock()) {
ResultPtr = (void*)getMachineBasicBlockAddress(MR.getBasicBlock());
} else if (MR.isConstantPoolIndex()) {
BufferBegin = CurBufferPtr = MemMgr->startExceptionTable(F.getFunction(),
ActualSize);
BufferEnd = BufferBegin+ActualSize;
+ EmittedFunctions[F.getFunction()].ExceptionTable = BufferBegin;
uint8_t *EhStart;
uint8_t *FrameRegister = DE->EmitDwarfTable(F, *this, FnStart, FnEnd,
EhStart);
if (MMI)
MMI->EndFunction();
-
+
return false;
}
/// deallocateMemForFunction - Deallocate all memory for the specified
/// function body. Also drop any references the function has to stubs.
+/// May be called while the Function is being destroyed inside ~Value().
void JITEmitter::deallocateMemForFunction(const Function *F) {
- MemMgr->deallocateMemForFunction(F);
+ ValueMap<const Function *, EmittedCode, EmittedFunctionConfig>::iterator
+ Emitted = EmittedFunctions.find(F);
+ if (Emitted != EmittedFunctions.end()) {
+ MemMgr->deallocateFunctionBody(Emitted->second.FunctionBody);
+ MemMgr->deallocateExceptionTable(Emitted->second.ExceptionTable);
+ TheJIT->NotifyFreeingMachineCode(Emitted->second.Code);
+
+ EmittedFunctions.erase(Emitted);
+ }
// TODO: Do we need to unregister exception handling information from libgcc
// here?
// If the function did not reference any stubs, return.
if (CurFnStubUses.find(F) == CurFnStubUses.end())
return;
-
+
// For each referenced stub, erase the reference to this function, and then
// erase the list of referenced stubs.
SmallVectorImpl<void *> &StubList = CurFnStubUses[F];
for (unsigned i = 0, e = StubList.size(); i != e; ++i) {
void *Stub = StubList[i];
-
+
// If we already invalidated this stub for this function, continue.
if (StubFnRefs.count(Stub) == 0)
continue;
-
+
SmallPtrSet<const Function *, 1> &FnRefs = StubFnRefs[Stub];
FnRefs.erase(F);
-
+
// If this function was the last reference to the stub, invalidate the stub
// in the JITResolver. Were there a memory manager deallocateStub routine,
// we could call that at this point too.
StubFnRefs.erase(Stub);
// Invalidate the stub. If it is a GV stub, update the JIT's global
- // mapping for that GV to zero, otherwise, search the string map of
- // external function names to stubs and remove the entry for this stub.
+ // mapping for that GV to zero.
GlobalValue *GV = Resolver.invalidateStub(Stub);
if (GV) {
TheJIT->updateGlobalMapping(GV, 0);
- } else {
- for (StringMapIterator<void*> i = ExtFnStubs.begin(),
- e = ExtFnStubs.end(); i != e; ++i) {
- if (i->second == Stub) {
- ExtFnStubs.erase(i);
- break;
- }
- }
}
}
}
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();
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
}
} else {
assert(MJTI->getEntrySize() == sizeof(void*) && "Cross JIT'ing?");
-
- // For each jump table, map each target in the jump table to the address of
+
+ // For each jump table, map each target in the jump table to the address of
// an emitted MachineBasicBlock.
intptr_t *SlotPtr = (intptr_t*)JumpTableBase;
SavedBufferBegin = BufferBegin;
SavedBufferEnd = BufferEnd;
SavedCurBufferPtr = CurBufferPtr;
-
+
BufferBegin = CurBufferPtr = MemMgr->allocateStub(GV, StubSize, Alignment);
BufferEnd = BufferBegin+StubSize+1;
}
SavedBufferBegin = BufferBegin;
SavedBufferEnd = BufferEnd;
SavedCurBufferPtr = CurBufferPtr;
-
+
BufferBegin = CurBufferPtr = (uint8_t *)Buffer;
BufferEnd = BufferBegin+StubSize+1;
}
uintptr_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 (uintptr_t)((char *)JumpTableBase + Offset);
}
+void JITEmitter::EmittedFunctionConfig::onDelete(
+ JITEmitter *Emitter, const Function *F) {
+ Emitter->deallocateMemForFunction(F);
+}
+void JITEmitter::EmittedFunctionConfig::onRAUW(
+ JITEmitter *, const Function*, const Function*) {
+ llvm_unreachable("The JIT doesn't know how to handle a"
+ " RAUW on a value it has emitted.");
+}
+
+
//===----------------------------------------------------------------------===//
// Public interface to this file
//===----------------------------------------------------------------------===//
// 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(isa<JITEmitter>(JCE) && "Unexpected MCE?");
JITEmitter *JE = cast<JITEmitter>(getCodeEmitter());
getJITInfo().emitFunctionStubAtAddr(F, Addr, Stub, *getCodeEmitter());
}
-/// updateDlsymStubTable - Emit the data necessary to relocate the stubs
-/// that were emitted during code generation.
-///
-void JIT::updateDlsymStubTable() {
- assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
- JITEmitter *JE = cast<JITEmitter>(getCodeEmitter());
-
- SmallVector<GlobalValue*, 8> GVs;
- SmallVector<void*, 8> Ptrs;
- const StringMap<void *> &ExtFns = JE->getExternalFnStubs();
-
- JE->getJITResolver().getRelocatableGVs(GVs, Ptrs);
-
- unsigned nStubs = GVs.size() + ExtFns.size();
-
- // If there are no relocatable stubs, return.
- if (nStubs == 0)
- return;
-
- // If there are no new relocatable stubs, return.
- void *CurTable = JE->getMemMgr()->getDlsymTable();
- if (CurTable && (*(unsigned *)CurTable == nStubs))
- return;
-
- // Calculate the size of the stub info
- unsigned offset = 4 + 4 * nStubs + sizeof(intptr_t) * nStubs;
-
- SmallVector<unsigned, 8> Offsets;
- for (unsigned i = 0; i != GVs.size(); ++i) {
- Offsets.push_back(offset);
- offset += GVs[i]->getName().size() + 1;
- }
- for (StringMapConstIterator<void*> i = ExtFns.begin(), e = ExtFns.end();
- i != e; ++i) {
- Offsets.push_back(offset);
- offset += strlen(i->first()) + 1;
- }
-
- // Allocate space for the new "stub", which contains the dlsym table.
- JE->startGVStub(0, offset, 4);
-
- // Emit the number of records
- JE->emitInt32(nStubs);
-
- // Emit the string offsets
- for (unsigned i = 0; i != nStubs; ++i)
- JE->emitInt32(Offsets[i]);
-
- // Emit the pointers. Verify that they are at least 2-byte aligned, and set
- // the low bit to 0 == GV, 1 == Function, so that the client code doing the
- // relocation can write the relocated pointer at the appropriate place in
- // the stub.
- for (unsigned i = 0; i != GVs.size(); ++i) {
- intptr_t Ptr = (intptr_t)Ptrs[i];
- assert((Ptr & 1) == 0 && "Stub pointers must be at least 2-byte aligned!");
-
- if (isa<Function>(GVs[i]))
- Ptr |= (intptr_t)1;
-
- if (sizeof(Ptr) == 8)
- JE->emitInt64(Ptr);
- else
- JE->emitInt32(Ptr);
- }
- for (StringMapConstIterator<void*> i = ExtFns.begin(), e = ExtFns.end();
- i != e; ++i) {
- intptr_t Ptr = (intptr_t)i->second | 1;
-
- if (sizeof(Ptr) == 8)
- JE->emitInt64(Ptr);
- else
- JE->emitInt32(Ptr);
- }
-
- // Emit the strings.
- for (unsigned i = 0; i != GVs.size(); ++i)
- JE->emitString(GVs[i]->getName());
- for (StringMapConstIterator<void*> i = ExtFns.begin(), e = ExtFns.end();
- i != e; ++i)
- JE->emitString(i->first());
-
- // Tell the JIT memory manager where it is. The JIT Memory Manager will
- // deallocate space for the old one, if one existed.
- JE->getMemMgr()->SetDlsymTable(JE->finishGVStub(0));
-}
-
/// 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.
- void *OldPtr = updateGlobalMapping(F, 0);
-
- if (OldPtr)
- TheJIT->NotifyFreeingMachineCode(*F, OldPtr);
+ updateGlobalMapping(F, 0);
// Free the actual memory for the function body and related stuff.
assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
projects / oota-llvm.git / blobdiff