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//===-- JITEmitter.cpp - Write machine code to executable memory ----------===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This file defines a MachineCodeEmitter object that is used by the JIT to
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// write machine code to memory and remember where relocatable values are.
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "jit"
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#include "JITDebugRegisterer.h"
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#include "JITDwarfEmitter.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/Constants.h"
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#include "llvm/Module.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Analysis/DebugInfo.h"
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#include "llvm/CodeGen/JITCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineCodeInfo.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineRelocation.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/ExecutionEngine/JITEventListener.h"
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#include "llvm/ExecutionEngine/JITMemoryManager.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetJITInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MutexGuard.h"
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#include "llvm/Support/ValueHandle.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/System/Disassembler.h"
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#include "llvm/System/Memory.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/ValueMap.h"
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STATISTIC(NumBytes, "Number of bytes of machine code compiled");
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STATISTIC(NumRelos, "Number of relocations applied");
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STATISTIC(NumRetries, "Number of retries with more memory");
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// A declaration may stop being a declaration once it's fully read from bitcode.
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// This function returns true if F is fully read and is still a declaration.
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static bool isNonGhostDeclaration(const Function *F) {
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return F->isDeclaration() && !F->isMaterializable();
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//===----------------------------------------------------------------------===//
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// JIT lazy compilation code.
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class JITResolverState;
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template<typename ValueTy>
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struct NoRAUWValueMapConfig : public ValueMapConfig<ValueTy> {
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typedef JITResolverState *ExtraData;
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static void onRAUW(JITResolverState *, Value *Old, Value *New) {
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assert(false && "The JIT doesn't know how to handle a"
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" RAUW on a value it has emitted.");
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struct CallSiteValueMapConfig : public NoRAUWValueMapConfig<Function*> {
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typedef JITResolverState *ExtraData;
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static void onDelete(JITResolverState *JRS, Function *F);
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class JITResolverState {
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typedef ValueMap<Function*, void*, NoRAUWValueMapConfig<Function*> >
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FunctionToLazyStubMapTy;
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typedef std::map<void*, AssertingVH<Function> > CallSiteToFunctionMapTy;
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typedef ValueMap<Function *, SmallPtrSet<void*, 1>,
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CallSiteValueMapConfig> FunctionToCallSitesMapTy;
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typedef std::map<AssertingVH<GlobalValue>, void*> GlobalToIndirectSymMapTy;
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/// FunctionToLazyStubMap - Keep track of the lazy stub created for a
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/// particular function so that we can reuse them if necessary.
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FunctionToLazyStubMapTy FunctionToLazyStubMap;
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/// CallSiteToFunctionMap - Keep track of the function that each lazy call
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/// site corresponds to, and vice versa.
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CallSiteToFunctionMapTy CallSiteToFunctionMap;
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FunctionToCallSitesMapTy FunctionToCallSitesMap;
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/// GlobalToIndirectSymMap - Keep track of the indirect symbol created for a
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/// particular GlobalVariable so that we can reuse them if necessary.
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GlobalToIndirectSymMapTy GlobalToIndirectSymMap;
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/// Instance of the JIT this ResolverState serves.
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JITResolverState(JIT *jit) : FunctionToLazyStubMap(this),
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FunctionToCallSitesMap(this),
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FunctionToLazyStubMapTy& getFunctionToLazyStubMap(
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const MutexGuard& locked) {
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assert(locked.holds(TheJIT->lock));
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return FunctionToLazyStubMap;
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GlobalToIndirectSymMapTy& getGlobalToIndirectSymMap(const MutexGuard& locked) {
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assert(locked.holds(TheJIT->lock));
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return GlobalToIndirectSymMap;
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pair<void *, Function *> LookupFunctionFromCallSite(
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const MutexGuard &locked, void *CallSite) const {
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assert(locked.holds(TheJIT->lock));
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// The address given to us for the stub may not be exactly right, it might be
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// a little bit after the stub. As such, use upper_bound to find it.
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CallSiteToFunctionMapTy::const_iterator I =
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CallSiteToFunctionMap.upper_bound(CallSite);
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assert(I != CallSiteToFunctionMap.begin() &&
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"This is not a known call site!");
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void AddCallSite(const MutexGuard &locked, void *CallSite, Function *F) {
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assert(locked.holds(TheJIT->lock));
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bool Inserted = CallSiteToFunctionMap.insert(
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std::make_pair(CallSite, F)).second;
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assert(Inserted && "Pair was already in CallSiteToFunctionMap");
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FunctionToCallSitesMap[F].insert(CallSite);
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void EraseAllCallSitesForPrelocked(Function *F);
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// Erases _all_ call sites regardless of their function. This is used to
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// unregister the stub addresses from the StubToResolverMap in
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void EraseAllCallSitesPrelocked();
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/// JITResolver - Keep track of, and resolve, call sites for functions that
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/// have not yet been compiled.
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typedef JITResolverState::FunctionToLazyStubMapTy FunctionToLazyStubMapTy;
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typedef JITResolverState::CallSiteToFunctionMapTy CallSiteToFunctionMapTy;
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typedef JITResolverState::GlobalToIndirectSymMapTy GlobalToIndirectSymMapTy;
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/// LazyResolverFn - The target lazy resolver function that we actually
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/// rewrite instructions to use.
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TargetJITInfo::LazyResolverFn LazyResolverFn;
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JITResolverState state;
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/// ExternalFnToStubMap - This is the equivalent of FunctionToLazyStubMap
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/// for external functions. TODO: Of course, external functions don't need
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/// a lazy stub. It's actually here to make it more likely that far calls
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/// succeed, but no single stub can guarantee that. I'll remove this in a
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/// subsequent checkin when I actually fix far calls.
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std::map<void*, void*> ExternalFnToStubMap;
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/// revGOTMap - map addresses to indexes in the GOT
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std::map<void*, unsigned> revGOTMap;
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unsigned nextGOTIndex;
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/// Instance of JIT corresponding to this Resolver.
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explicit JITResolver(JIT &jit, JITEmitter &je)
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: state(&jit), nextGOTIndex(0), JE(je), TheJIT(&jit) {
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LazyResolverFn = jit.getJITInfo().getLazyResolverFunction(JITCompilerFn);
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/// getLazyFunctionStubIfAvailable - This returns a pointer to a function's
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/// lazy-compilation stub if it has already been created.
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void *getLazyFunctionStubIfAvailable(Function *F);
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/// getLazyFunctionStub - This returns a pointer to a function's
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/// lazy-compilation stub, creating one on demand as needed.
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void *getLazyFunctionStub(Function *F);
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/// getExternalFunctionStub - Return a stub for the function at the
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/// specified address, created lazily on demand.
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void *getExternalFunctionStub(void *FnAddr);
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/// getGlobalValueIndirectSym - Return an indirect symbol containing the
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/// specified GV address.
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void *getGlobalValueIndirectSym(GlobalValue *V, void *GVAddress);
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/// getGOTIndexForAddress - Return a new or existing index in the GOT for
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/// an address. This function only manages slots, it does not manage the
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/// contents of the slots or the memory associated with the GOT.
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unsigned getGOTIndexForAddr(void *addr);
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/// JITCompilerFn - This function is called to resolve a stub to a compiled
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/// address. If the LLVM Function corresponding to the stub has not yet
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/// been compiled, this function compiles it first.
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static void *JITCompilerFn(void *Stub);
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class StubToResolverMapTy {
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/// Map a stub address to a specific instance of a JITResolver so that
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/// lazily-compiled functions can find the right resolver to use.
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std::map<void*, JITResolver*> Map;
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/// Guards Map from concurrent accesses.
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mutable sys::Mutex Lock;
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/// Registers a Stub to be resolved by Resolver.
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void RegisterStubResolver(void *Stub, JITResolver *Resolver) {
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MutexGuard guard(Lock);
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Map.insert(std::make_pair(Stub, Resolver));
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/// Unregisters the Stub when it's invalidated.
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void UnregisterStubResolver(void *Stub) {
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MutexGuard guard(Lock);
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/// Returns the JITResolver instance that owns the Stub.
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JITResolver *getResolverFromStub(void *Stub) const {
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MutexGuard guard(Lock);
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// The address given to us for the stub may not be exactly right, it might
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// be a little bit after the stub. As such, use upper_bound to find it.
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// This is the same trick as in LookupFunctionFromCallSite from
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std::map<void*, JITResolver*>::const_iterator I = Map.upper_bound(Stub);
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assert(I != Map.begin() && "This is not a known stub!");
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/// True if any stubs refer to the given resolver. Only used in an assert().
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bool ResolverHasStubs(JITResolver* Resolver) const {
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MutexGuard guard(Lock);
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for (std::map<void*, JITResolver*>::const_iterator I = Map.begin(),
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E = Map.end(); I != E; ++I) {
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if (I->second == Resolver)
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/// This needs to be static so that a lazy call stub can access it with no
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/// context except the address of the stub.
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ManagedStatic<StubToResolverMapTy> StubToResolverMap;
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/// JITEmitter - The JIT implementation of the MachineCodeEmitter, which is
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/// used to output functions to memory for execution.
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class JITEmitter : public JITCodeEmitter {
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JITMemoryManager *MemMgr;
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// When outputting a function stub in the context of some other function, we
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// save BufferBegin/BufferEnd/CurBufferPtr here.
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uint8_t *SavedBufferBegin, *SavedBufferEnd, *SavedCurBufferPtr;
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// When reattempting to JIT a function after running out of space, we store
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// the estimated size of the function we're trying to JIT here, so we can
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// ask the memory manager for at least this much space. When we
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// successfully emit the function, we reset this back to zero.
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uintptr_t SizeEstimate;
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/// Relocations - These are the relocations that the function needs, as
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std::vector<MachineRelocation> Relocations;
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/// MBBLocations - This vector is a mapping from MBB ID's to their address.
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/// It is filled in by the StartMachineBasicBlock callback and queried by
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/// the getMachineBasicBlockAddress callback.
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std::vector<uintptr_t> MBBLocations;
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/// ConstantPool - The constant pool for the current function.
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MachineConstantPool *ConstantPool;
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/// ConstantPoolBase - A pointer to the first entry in the constant pool.
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void *ConstantPoolBase;
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/// ConstPoolAddresses - Addresses of individual constant pool entries.
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SmallVector<uintptr_t, 8> ConstPoolAddresses;
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/// JumpTable - The jump tables for the current function.
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MachineJumpTableInfo *JumpTable;
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/// JumpTableBase - A pointer to the first entry in the jump table.
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/// Resolver - This contains info about the currently resolved functions.
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JITResolver Resolver;
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/// DE - The dwarf emitter for the jit.
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OwningPtr<JITDwarfEmitter> DE;
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/// DR - The debug registerer for the jit.
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OwningPtr<JITDebugRegisterer> DR;
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/// LabelLocations - This vector is a mapping from Label ID's to their
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DenseMap<MCSymbol*, uintptr_t> LabelLocations;
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/// MMI - Machine module info for exception informations
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MachineModuleInfo* MMI;
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// CurFn - The llvm function being emitted. Only valid during
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const Function *CurFn;
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/// Information about emitted code, which is passed to the
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/// JITEventListeners. This is reset in startFunction and used in
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JITEvent_EmittedFunctionDetails EmissionDetails;
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void *FunctionBody; // Beginning of the function's allocation.
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void *Code; // The address the function's code actually starts at.
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void *ExceptionTable;
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EmittedCode() : FunctionBody(0), Code(0), ExceptionTable(0) {}
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struct EmittedFunctionConfig : public ValueMapConfig<const Function*> {
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typedef JITEmitter *ExtraData;
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static void onDelete(JITEmitter *, const Function*);
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static void onRAUW(JITEmitter *, const Function*, const Function*);
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ValueMap<const Function *, EmittedCode,
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EmittedFunctionConfig> EmittedFunctions;
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/// Instance of the JIT
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JITEmitter(JIT &jit, JITMemoryManager *JMM, TargetMachine &TM)
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: SizeEstimate(0), Resolver(jit, *this), MMI(0), CurFn(0),
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EmittedFunctions(this), TheJIT(&jit) {
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MemMgr = JMM ? JMM : JITMemoryManager::CreateDefaultMemManager();
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if (jit.getJITInfo().needsGOT()) {
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MemMgr->AllocateGOT();
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DEBUG(dbgs() << "JIT is managing a GOT\n");
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if (JITExceptionHandling || JITEmitDebugInfo) {
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DE.reset(new JITDwarfEmitter(jit));
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if (JITEmitDebugInfo) {
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DR.reset(new JITDebugRegisterer(TM));
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/// classof - Methods for support type inquiry through isa, cast, and
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static inline bool classof(const MachineCodeEmitter*) { return true; }
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JITResolver &getJITResolver() { return Resolver; }
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virtual void startFunction(MachineFunction &F);
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virtual bool finishFunction(MachineFunction &F);
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void emitConstantPool(MachineConstantPool *MCP);
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void initJumpTableInfo(MachineJumpTableInfo *MJTI);
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void emitJumpTableInfo(MachineJumpTableInfo *MJTI);
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void startGVStub(const GlobalValue* GV,
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unsigned StubSize, unsigned Alignment = 1);
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void startGVStub(void *Buffer, unsigned StubSize);
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virtual void *allocIndirectGV(const GlobalValue *GV,
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const uint8_t *Buffer, size_t Size,
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/// allocateSpace - Reserves space in the current block if any, or
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/// allocate a new one of the given size.
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virtual void *allocateSpace(uintptr_t Size, unsigned Alignment);
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/// allocateGlobal - Allocate memory for a global. Unlike allocateSpace,
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/// this method does not allocate memory in the current output buffer,
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/// because a global may live longer than the current function.
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virtual void *allocateGlobal(uintptr_t Size, unsigned Alignment);
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virtual void addRelocation(const MachineRelocation &MR) {
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Relocations.push_back(MR);
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virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) {
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if (MBBLocations.size() <= (unsigned)MBB->getNumber())
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MBBLocations.resize((MBB->getNumber()+1)*2);
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MBBLocations[MBB->getNumber()] = getCurrentPCValue();
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if (MBB->hasAddressTaken())
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TheJIT->addPointerToBasicBlock(MBB->getBasicBlock(),
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(void*)getCurrentPCValue());
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DEBUG(dbgs() << "JIT: Emitting BB" << MBB->getNumber() << " at ["
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<< (void*) getCurrentPCValue() << "]\n");
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virtual uintptr_t getConstantPoolEntryAddress(unsigned Entry) const;
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virtual uintptr_t getJumpTableEntryAddress(unsigned Entry) const;
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virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const{
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assert(MBBLocations.size() > (unsigned)MBB->getNumber() &&
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MBBLocations[MBB->getNumber()] && "MBB not emitted!");
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return MBBLocations[MBB->getNumber()];
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/// retryWithMoreMemory - Log a retry and deallocate all memory for the
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/// given function. Increase the minimum allocation size so that we get
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/// more memory next time.
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void retryWithMoreMemory(MachineFunction &F);
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/// deallocateMemForFunction - Deallocate all memory for the specified
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void deallocateMemForFunction(const Function *F);
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virtual void processDebugLoc(DebugLoc DL, bool BeforePrintingInsn);
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virtual void emitLabel(MCSymbol *Label) {
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LabelLocations[Label] = getCurrentPCValue();
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virtual DenseMap<MCSymbol*, uintptr_t> *getLabelLocations() {
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return &LabelLocations;
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virtual uintptr_t getLabelAddress(MCSymbol *Label) const {
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assert(LabelLocations.count(Label) && "Label not emitted!");
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return LabelLocations.find(Label)->second;
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virtual void setModuleInfo(MachineModuleInfo* Info) {
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if (DE.get()) DE->setModuleInfo(Info);
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void *getPointerToGlobal(GlobalValue *GV, void *Reference,
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bool MayNeedFarStub);
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void *getPointerToGVIndirectSym(GlobalValue *V, void *Reference);
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void CallSiteValueMapConfig::onDelete(JITResolverState *JRS, Function *F) {
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JRS->EraseAllCallSitesForPrelocked(F);
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void JITResolverState::EraseAllCallSitesForPrelocked(Function *F) {
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FunctionToCallSitesMapTy::iterator F2C = FunctionToCallSitesMap.find(F);
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if (F2C == FunctionToCallSitesMap.end())
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StubToResolverMapTy &S2RMap = *StubToResolverMap;
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for (SmallPtrSet<void*, 1>::const_iterator I = F2C->second.begin(),
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E = F2C->second.end(); I != E; ++I) {
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S2RMap.UnregisterStubResolver(*I);
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bool Erased = CallSiteToFunctionMap.erase(*I);
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assert(Erased && "Missing call site->function mapping");
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FunctionToCallSitesMap.erase(F2C);
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void JITResolverState::EraseAllCallSitesPrelocked() {
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StubToResolverMapTy &S2RMap = *StubToResolverMap;
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for (CallSiteToFunctionMapTy::const_iterator
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I = CallSiteToFunctionMap.begin(),
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E = CallSiteToFunctionMap.end(); I != E; ++I) {
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S2RMap.UnregisterStubResolver(I->first);
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CallSiteToFunctionMap.clear();
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FunctionToCallSitesMap.clear();
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JITResolver::~JITResolver() {
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// No need to lock because we're in the destructor, and state isn't shared.
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state.EraseAllCallSitesPrelocked();
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assert(!StubToResolverMap->ResolverHasStubs(this) &&
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"Resolver destroyed with stubs still alive.");
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/// getLazyFunctionStubIfAvailable - This returns a pointer to a function stub
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/// if it has already been created.
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void *JITResolver::getLazyFunctionStubIfAvailable(Function *F) {
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MutexGuard locked(TheJIT->lock);
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// If we already have a stub for this function, recycle it.
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return state.getFunctionToLazyStubMap(locked).lookup(F);
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/// getFunctionStub - This returns a pointer to a function stub, creating
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/// one on demand as needed.
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void *JITResolver::getLazyFunctionStub(Function *F) {
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MutexGuard locked(TheJIT->lock);
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// If we already have a lazy stub for this function, recycle it.
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void *&Stub = state.getFunctionToLazyStubMap(locked)[F];
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if (Stub) return Stub;
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// Call the lazy resolver function if we are JIT'ing lazily. Otherwise we
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// must resolve the symbol now.
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void *Actual = TheJIT->isCompilingLazily()
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? (void *)(intptr_t)LazyResolverFn : (void *)0;
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// If this is an external declaration, attempt to resolve the address now
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// to place in the stub.
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if (isNonGhostDeclaration(F) || F->hasAvailableExternallyLinkage()) {
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Actual = TheJIT->getPointerToFunction(F);
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// If we resolved the symbol to a null address (eg. a weak external)
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// don't emit a stub. Return a null pointer to the application.
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if (!Actual) return 0;
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TargetJITInfo::StubLayout SL = TheJIT->getJITInfo().getStubLayout();
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JE.startGVStub(F, SL.Size, SL.Alignment);
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// Codegen a new stub, calling the lazy resolver or the actual address of the
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// external function, if it was resolved.
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Stub = TheJIT->getJITInfo().emitFunctionStub(F, Actual, JE);
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if (Actual != (void*)(intptr_t)LazyResolverFn) {
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// If we are getting the stub for an external function, we really want the
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// address of the stub in the GlobalAddressMap for the JIT, not the address
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// of the external function.
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TheJIT->updateGlobalMapping(F, Stub);
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DEBUG(dbgs() << "JIT: Lazy stub emitted at [" << Stub << "] for function '"
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<< F->getName() << "'\n");
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if (TheJIT->isCompilingLazily()) {
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// Register this JITResolver as the one corresponding to this call site so
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// JITCompilerFn will be able to find it.
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StubToResolverMap->RegisterStubResolver(Stub, this);
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// Finally, keep track of the stub-to-Function mapping so that the
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// JITCompilerFn knows which function to compile!
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state.AddCallSite(locked, Stub, F);
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} else if (!Actual) {
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// If we are JIT'ing non-lazily but need to call a function that does not
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// exist yet, add it to the JIT's work list so that we can fill in the
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// stub address later.
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assert(!isNonGhostDeclaration(F) && !F->hasAvailableExternallyLinkage() &&
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"'Actual' should have been set above.");
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TheJIT->addPendingFunction(F);
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/// getGlobalValueIndirectSym - Return a lazy pointer containing the specified
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void *JITResolver::getGlobalValueIndirectSym(GlobalValue *GV, void *GVAddress) {
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MutexGuard locked(TheJIT->lock);
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// If we already have a stub for this global variable, recycle it.
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void *&IndirectSym = state.getGlobalToIndirectSymMap(locked)[GV];
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if (IndirectSym) return IndirectSym;
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// Otherwise, codegen a new indirect symbol.
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IndirectSym = TheJIT->getJITInfo().emitGlobalValueIndirectSym(GV, GVAddress,
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DEBUG(dbgs() << "JIT: Indirect symbol emitted at [" << IndirectSym
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<< "] for GV '" << GV->getName() << "'\n");
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/// getExternalFunctionStub - Return a stub for the function at the
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/// specified address, created lazily on demand.
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void *JITResolver::getExternalFunctionStub(void *FnAddr) {
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// If we already have a stub for this function, recycle it.
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void *&Stub = ExternalFnToStubMap[FnAddr];
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if (Stub) return Stub;
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TargetJITInfo::StubLayout SL = TheJIT->getJITInfo().getStubLayout();
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JE.startGVStub(0, SL.Size, SL.Alignment);
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Stub = TheJIT->getJITInfo().emitFunctionStub(0, FnAddr, JE);
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DEBUG(dbgs() << "JIT: Stub emitted at [" << Stub
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<< "] for external function at '" << FnAddr << "'\n");
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unsigned JITResolver::getGOTIndexForAddr(void* addr) {
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unsigned idx = revGOTMap[addr];
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idx = ++nextGOTIndex;
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revGOTMap[addr] = idx;
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DEBUG(dbgs() << "JIT: Adding GOT entry " << idx << " for addr ["
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/// JITCompilerFn - This function is called when a lazy compilation stub has
631
/// been entered. It looks up which function this stub corresponds to, compiles
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/// it if necessary, then returns the resultant function pointer.
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void *JITResolver::JITCompilerFn(void *Stub) {
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JITResolver *JR = StubToResolverMap->getResolverFromStub(Stub);
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assert(JR && "Unable to find the corresponding JITResolver to the call site");
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// Only lock for getting the Function. The call getPointerToFunction made
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// in this function might trigger function materializing, which requires
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// JIT lock to be unlocked.
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MutexGuard locked(JR->TheJIT->lock);
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// The address given to us for the stub may not be exactly right, it might
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// be a little bit after the stub. As such, use upper_bound to find it.
648
pair<void*, Function*> I =
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JR->state.LookupFunctionFromCallSite(locked, Stub);
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// If we have already code generated the function, just return the address.
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void *Result = JR->TheJIT->getPointerToGlobalIfAvailable(F);
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// Otherwise we don't have it, do lazy compilation now.
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// If lazy compilation is disabled, emit a useful error message and abort.
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if (!JR->TheJIT->isCompilingLazily()) {
662
report_fatal_error("LLVM JIT requested to do lazy compilation of function '"
663
+ F->getName() + "' when lazy compiles are disabled!");
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DEBUG(dbgs() << "JIT: Lazily resolving function '" << F->getName()
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<< "' In stub ptr = " << Stub << " actual ptr = "
668
<< ActualPtr << "\n");
670
Result = JR->TheJIT->getPointerToFunction(F);
673
// Reacquire the lock to update the GOT map.
674
MutexGuard locked(JR->TheJIT->lock);
676
// We might like to remove the call site from the CallSiteToFunction map, but
677
// we can't do that! Multiple threads could be stuck, waiting to acquire the
678
// lock above. As soon as the 1st function finishes compiling the function,
679
// the next one will be released, and needs to be able to find the function it
682
// FIXME: We could rewrite all references to this stub if we knew them.
684
// What we will do is set the compiled function address to map to the
685
// same GOT entry as the stub so that later clients may update the GOT
686
// if they see it still using the stub address.
687
// Note: this is done so the Resolver doesn't have to manage GOT memory
688
// Do this without allocating map space if the target isn't using a GOT
689
if(JR->revGOTMap.find(Stub) != JR->revGOTMap.end())
690
JR->revGOTMap[Result] = JR->revGOTMap[Stub];
695
//===----------------------------------------------------------------------===//
698
void *JITEmitter::getPointerToGlobal(GlobalValue *V, void *Reference,
699
bool MayNeedFarStub) {
700
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V))
701
return TheJIT->getOrEmitGlobalVariable(GV);
703
if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
704
return TheJIT->getPointerToGlobal(GA->resolveAliasedGlobal(false));
706
// If we have already compiled the function, return a pointer to its body.
707
Function *F = cast<Function>(V);
709
void *FnStub = Resolver.getLazyFunctionStubIfAvailable(F);
711
// Return the function stub if it's already created. We do this first so
712
// that we're returning the same address for the function as any previous
713
// call. TODO: Yes, this is wrong. The lazy stub isn't guaranteed to be
714
// close enough to call.
718
// If we know the target can handle arbitrary-distance calls, try to
719
// return a direct pointer.
720
if (!MayNeedFarStub) {
721
// If we have code, go ahead and return that.
722
void *ResultPtr = TheJIT->getPointerToGlobalIfAvailable(F);
723
if (ResultPtr) return ResultPtr;
725
// If this is an external function pointer, we can force the JIT to
726
// 'compile' it, which really just adds it to the map.
727
if (isNonGhostDeclaration(F) || F->hasAvailableExternallyLinkage())
728
return TheJIT->getPointerToFunction(F);
731
// Otherwise, we may need a to emit a stub, and, conservatively, we always do
732
// so. Note that it's possible to return null from getLazyFunctionStub in the
733
// case of a weak extern that fails to resolve.
734
return Resolver.getLazyFunctionStub(F);
737
void *JITEmitter::getPointerToGVIndirectSym(GlobalValue *V, void *Reference) {
738
// Make sure GV is emitted first, and create a stub containing the fully
740
void *GVAddress = getPointerToGlobal(V, Reference, false);
741
void *StubAddr = Resolver.getGlobalValueIndirectSym(V, GVAddress);
745
void JITEmitter::processDebugLoc(DebugLoc DL, bool BeforePrintingInsn) {
746
if (DL.isUnknown()) return;
747
if (!BeforePrintingInsn) return;
749
const LLVMContext &Context = EmissionDetails.MF->getFunction()->getContext();
751
if (DL.getScope(Context) != 0 && PrevDL != DL) {
752
JITEvent_EmittedFunctionDetails::LineStart NextLine;
753
NextLine.Address = getCurrentPCValue();
755
EmissionDetails.LineStarts.push_back(NextLine);
761
static unsigned GetConstantPoolSizeInBytes(MachineConstantPool *MCP,
762
const TargetData *TD) {
763
const std::vector<MachineConstantPoolEntry> &Constants = MCP->getConstants();
764
if (Constants.empty()) return 0;
767
for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
768
MachineConstantPoolEntry CPE = Constants[i];
769
unsigned AlignMask = CPE.getAlignment() - 1;
770
Size = (Size + AlignMask) & ~AlignMask;
771
const Type *Ty = CPE.getType();
772
Size += TD->getTypeAllocSize(Ty);
777
void JITEmitter::startFunction(MachineFunction &F) {
778
DEBUG(dbgs() << "JIT: Starting CodeGen of Function "
779
<< F.getFunction()->getName() << "\n");
781
uintptr_t ActualSize = 0;
782
// Set the memory writable, if it's not already
783
MemMgr->setMemoryWritable();
785
if (SizeEstimate > 0) {
786
// SizeEstimate will be non-zero on reallocation attempts.
787
ActualSize = SizeEstimate;
790
BufferBegin = CurBufferPtr = MemMgr->startFunctionBody(F.getFunction(),
792
BufferEnd = BufferBegin+ActualSize;
793
EmittedFunctions[F.getFunction()].FunctionBody = BufferBegin;
795
// Ensure the constant pool/jump table info is at least 4-byte aligned.
798
emitConstantPool(F.getConstantPool());
799
if (MachineJumpTableInfo *MJTI = F.getJumpTableInfo())
800
initJumpTableInfo(MJTI);
802
// About to start emitting the machine code for the function.
803
emitAlignment(std::max(F.getFunction()->getAlignment(), 8U));
804
TheJIT->updateGlobalMapping(F.getFunction(), CurBufferPtr);
805
EmittedFunctions[F.getFunction()].Code = CurBufferPtr;
807
MBBLocations.clear();
809
EmissionDetails.MF = &F;
810
EmissionDetails.LineStarts.clear();
813
bool JITEmitter::finishFunction(MachineFunction &F) {
814
if (CurBufferPtr == BufferEnd) {
815
// We must call endFunctionBody before retrying, because
816
// deallocateMemForFunction requires it.
817
MemMgr->endFunctionBody(F.getFunction(), BufferBegin, CurBufferPtr);
818
retryWithMoreMemory(F);
822
if (MachineJumpTableInfo *MJTI = F.getJumpTableInfo())
823
emitJumpTableInfo(MJTI);
825
// FnStart is the start of the text, not the start of the constant pool and
826
// other per-function data.
828
(uint8_t *)TheJIT->getPointerToGlobalIfAvailable(F.getFunction());
830
// FnEnd is the end of the function's machine code.
831
uint8_t *FnEnd = CurBufferPtr;
833
if (!Relocations.empty()) {
834
CurFn = F.getFunction();
835
NumRelos += Relocations.size();
837
// Resolve the relocations to concrete pointers.
838
for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
839
MachineRelocation &MR = Relocations[i];
841
if (!MR.letTargetResolve()) {
842
if (MR.isExternalSymbol()) {
843
ResultPtr = TheJIT->getPointerToNamedFunction(MR.getExternalSymbol(),
845
DEBUG(dbgs() << "JIT: Map \'" << MR.getExternalSymbol() << "\' to ["
846
<< ResultPtr << "]\n");
848
// If the target REALLY wants a stub for this function, emit it now.
849
if (MR.mayNeedFarStub()) {
850
ResultPtr = Resolver.getExternalFunctionStub(ResultPtr);
852
} else if (MR.isGlobalValue()) {
853
ResultPtr = getPointerToGlobal(MR.getGlobalValue(),
854
BufferBegin+MR.getMachineCodeOffset(),
855
MR.mayNeedFarStub());
856
} else if (MR.isIndirectSymbol()) {
857
ResultPtr = getPointerToGVIndirectSym(
858
MR.getGlobalValue(), BufferBegin+MR.getMachineCodeOffset());
859
} else if (MR.isBasicBlock()) {
860
ResultPtr = (void*)getMachineBasicBlockAddress(MR.getBasicBlock());
861
} else if (MR.isConstantPoolIndex()) {
862
ResultPtr = (void*)getConstantPoolEntryAddress(MR.getConstantPoolIndex());
864
assert(MR.isJumpTableIndex());
865
ResultPtr=(void*)getJumpTableEntryAddress(MR.getJumpTableIndex());
868
MR.setResultPointer(ResultPtr);
871
// if we are managing the GOT and the relocation wants an index,
873
if (MR.isGOTRelative() && MemMgr->isManagingGOT()) {
874
unsigned idx = Resolver.getGOTIndexForAddr(ResultPtr);
876
if (((void**)MemMgr->getGOTBase())[idx] != ResultPtr) {
877
DEBUG(dbgs() << "JIT: GOT was out of date for " << ResultPtr
878
<< " pointing at " << ((void**)MemMgr->getGOTBase())[idx]
880
((void**)MemMgr->getGOTBase())[idx] = ResultPtr;
886
TheJIT->getJITInfo().relocate(BufferBegin, &Relocations[0],
887
Relocations.size(), MemMgr->getGOTBase());
890
// Update the GOT entry for F to point to the new code.
891
if (MemMgr->isManagingGOT()) {
892
unsigned idx = Resolver.getGOTIndexForAddr((void*)BufferBegin);
893
if (((void**)MemMgr->getGOTBase())[idx] != (void*)BufferBegin) {
894
DEBUG(dbgs() << "JIT: GOT was out of date for " << (void*)BufferBegin
895
<< " pointing at " << ((void**)MemMgr->getGOTBase())[idx]
897
((void**)MemMgr->getGOTBase())[idx] = (void*)BufferBegin;
901
// CurBufferPtr may have moved beyond FnEnd, due to memory allocation for
902
// global variables that were referenced in the relocations.
903
MemMgr->endFunctionBody(F.getFunction(), BufferBegin, CurBufferPtr);
905
if (CurBufferPtr == BufferEnd) {
906
retryWithMoreMemory(F);
909
// Now that we've succeeded in emitting the function, reset the
910
// SizeEstimate back down to zero.
914
BufferBegin = CurBufferPtr = 0;
915
NumBytes += FnEnd-FnStart;
917
// Invalidate the icache if necessary.
918
sys::Memory::InvalidateInstructionCache(FnStart, FnEnd-FnStart);
920
TheJIT->NotifyFunctionEmitted(*F.getFunction(), FnStart, FnEnd-FnStart,
923
// Reset the previous debug location.
926
DEBUG(dbgs() << "JIT: Finished CodeGen of [" << (void*)FnStart
927
<< "] Function: " << F.getFunction()->getName()
928
<< ": " << (FnEnd-FnStart) << " bytes of text, "
929
<< Relocations.size() << " relocations\n");
932
ConstPoolAddresses.clear();
934
// Mark code region readable and executable if it's not so already.
935
MemMgr->setMemoryExecutable();
938
if (sys::hasDisassembler()) {
939
dbgs() << "JIT: Disassembled code:\n";
940
dbgs() << sys::disassembleBuffer(FnStart, FnEnd-FnStart,
943
dbgs() << "JIT: Binary code:\n";
944
uint8_t* q = FnStart;
945
for (int i = 0; q < FnEnd; q += 4, ++i) {
949
dbgs() << "JIT: " << (long)(q - FnStart) << ": ";
951
for (int j = 3; j >= 0; --j) {
955
dbgs() << (unsigned short)q[j];
967
if (JITExceptionHandling || JITEmitDebugInfo) {
968
uintptr_t ActualSize = 0;
969
SavedBufferBegin = BufferBegin;
970
SavedBufferEnd = BufferEnd;
971
SavedCurBufferPtr = CurBufferPtr;
973
BufferBegin = CurBufferPtr = MemMgr->startExceptionTable(F.getFunction(),
975
BufferEnd = BufferBegin+ActualSize;
976
EmittedFunctions[F.getFunction()].ExceptionTable = BufferBegin;
978
uint8_t *FrameRegister = DE->EmitDwarfTable(F, *this, FnStart, FnEnd,
980
MemMgr->endExceptionTable(F.getFunction(), BufferBegin, CurBufferPtr,
982
uint8_t *EhEnd = CurBufferPtr;
983
BufferBegin = SavedBufferBegin;
984
BufferEnd = SavedBufferEnd;
985
CurBufferPtr = SavedCurBufferPtr;
987
if (JITExceptionHandling) {
988
TheJIT->RegisterTable(FrameRegister);
991
if (JITEmitDebugInfo) {
997
DR->RegisterFunction(F.getFunction(), I);
1007
void JITEmitter::retryWithMoreMemory(MachineFunction &F) {
1008
DEBUG(dbgs() << "JIT: Ran out of space for native code. Reattempting.\n");
1009
Relocations.clear(); // Clear the old relocations or we'll reapply them.
1010
ConstPoolAddresses.clear();
1012
deallocateMemForFunction(F.getFunction());
1013
// Try again with at least twice as much free space.
1014
SizeEstimate = (uintptr_t)(2 * (BufferEnd - BufferBegin));
1016
for (MachineFunction::iterator MBB = F.begin(), E = F.end(); MBB != E; ++MBB){
1017
if (MBB->hasAddressTaken())
1018
TheJIT->clearPointerToBasicBlock(MBB->getBasicBlock());
1022
/// deallocateMemForFunction - Deallocate all memory for the specified
1023
/// function body. Also drop any references the function has to stubs.
1024
/// May be called while the Function is being destroyed inside ~Value().
1025
void JITEmitter::deallocateMemForFunction(const Function *F) {
1026
ValueMap<const Function *, EmittedCode, EmittedFunctionConfig>::iterator
1027
Emitted = EmittedFunctions.find(F);
1028
if (Emitted != EmittedFunctions.end()) {
1029
MemMgr->deallocateFunctionBody(Emitted->second.FunctionBody);
1030
MemMgr->deallocateExceptionTable(Emitted->second.ExceptionTable);
1031
TheJIT->NotifyFreeingMachineCode(Emitted->second.Code);
1033
EmittedFunctions.erase(Emitted);
1036
// TODO: Do we need to unregister exception handling information from libgcc
1039
if (JITEmitDebugInfo) {
1040
DR->UnregisterFunction(F);
1045
void* JITEmitter::allocateSpace(uintptr_t Size, unsigned Alignment) {
1047
return JITCodeEmitter::allocateSpace(Size, Alignment);
1049
// create a new memory block if there is no active one.
1050
// care must be taken so that BufferBegin is invalidated when a
1052
BufferBegin = CurBufferPtr = MemMgr->allocateSpace(Size, Alignment);
1053
BufferEnd = BufferBegin+Size;
1054
return CurBufferPtr;
1057
void* JITEmitter::allocateGlobal(uintptr_t Size, unsigned Alignment) {
1058
// Delegate this call through the memory manager.
1059
return MemMgr->allocateGlobal(Size, Alignment);
1062
void JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
1063
if (TheJIT->getJITInfo().hasCustomConstantPool())
1066
const std::vector<MachineConstantPoolEntry> &Constants = MCP->getConstants();
1067
if (Constants.empty()) return;
1069
unsigned Size = GetConstantPoolSizeInBytes(MCP, TheJIT->getTargetData());
1070
unsigned Align = MCP->getConstantPoolAlignment();
1071
ConstantPoolBase = allocateSpace(Size, Align);
1074
if (ConstantPoolBase == 0) return; // Buffer overflow.
1076
DEBUG(dbgs() << "JIT: Emitted constant pool at [" << ConstantPoolBase
1077
<< "] (size: " << Size << ", alignment: " << Align << ")\n");
1079
// Initialize the memory for all of the constant pool entries.
1080
unsigned Offset = 0;
1081
for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
1082
MachineConstantPoolEntry CPE = Constants[i];
1083
unsigned AlignMask = CPE.getAlignment() - 1;
1084
Offset = (Offset + AlignMask) & ~AlignMask;
1086
uintptr_t CAddr = (uintptr_t)ConstantPoolBase + Offset;
1087
ConstPoolAddresses.push_back(CAddr);
1088
if (CPE.isMachineConstantPoolEntry()) {
1089
// FIXME: add support to lower machine constant pool values into bytes!
1090
report_fatal_error("Initialize memory with machine specific constant pool"
1091
"entry has not been implemented!");
1093
TheJIT->InitializeMemory(CPE.Val.ConstVal, (void*)CAddr);
1094
DEBUG(dbgs() << "JIT: CP" << i << " at [0x";
1095
dbgs().write_hex(CAddr) << "]\n");
1097
const Type *Ty = CPE.Val.ConstVal->getType();
1098
Offset += TheJIT->getTargetData()->getTypeAllocSize(Ty);
1102
void JITEmitter::initJumpTableInfo(MachineJumpTableInfo *MJTI) {
1103
if (TheJIT->getJITInfo().hasCustomJumpTables())
1105
if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline)
1108
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1109
if (JT.empty()) return;
1111
unsigned NumEntries = 0;
1112
for (unsigned i = 0, e = JT.size(); i != e; ++i)
1113
NumEntries += JT[i].MBBs.size();
1115
unsigned EntrySize = MJTI->getEntrySize(*TheJIT->getTargetData());
1117
// Just allocate space for all the jump tables now. We will fix up the actual
1118
// MBB entries in the tables after we emit the code for each block, since then
1119
// we will know the final locations of the MBBs in memory.
1121
JumpTableBase = allocateSpace(NumEntries * EntrySize,
1122
MJTI->getEntryAlignment(*TheJIT->getTargetData()));
1125
void JITEmitter::emitJumpTableInfo(MachineJumpTableInfo *MJTI) {
1126
if (TheJIT->getJITInfo().hasCustomJumpTables())
1129
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1130
if (JT.empty() || JumpTableBase == 0) return;
1133
switch (MJTI->getEntryKind()) {
1134
case MachineJumpTableInfo::EK_Inline:
1136
case MachineJumpTableInfo::EK_BlockAddress: {
1137
// EK_BlockAddress - Each entry is a plain address of block, e.g.:
1139
assert(MJTI->getEntrySize(*TheJIT->getTargetData()) == sizeof(void*) &&
1142
// For each jump table, map each target in the jump table to the address of
1143
// an emitted MachineBasicBlock.
1144
intptr_t *SlotPtr = (intptr_t*)JumpTableBase;
1146
for (unsigned i = 0, e = JT.size(); i != e; ++i) {
1147
const std::vector<MachineBasicBlock*> &MBBs = JT[i].MBBs;
1148
// Store the address of the basic block for this jump table slot in the
1149
// memory we allocated for the jump table in 'initJumpTableInfo'
1150
for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi)
1151
*SlotPtr++ = getMachineBasicBlockAddress(MBBs[mi]);
1156
case MachineJumpTableInfo::EK_Custom32:
1157
case MachineJumpTableInfo::EK_GPRel32BlockAddress:
1158
case MachineJumpTableInfo::EK_LabelDifference32: {
1159
assert(MJTI->getEntrySize(*TheJIT->getTargetData()) == 4&&"Cross JIT'ing?");
1160
// For each jump table, place the offset from the beginning of the table
1161
// to the target address.
1162
int *SlotPtr = (int*)JumpTableBase;
1164
for (unsigned i = 0, e = JT.size(); i != e; ++i) {
1165
const std::vector<MachineBasicBlock*> &MBBs = JT[i].MBBs;
1166
// Store the offset of the basic block for this jump table slot in the
1167
// memory we allocated for the jump table in 'initJumpTableInfo'
1168
uintptr_t Base = (uintptr_t)SlotPtr;
1169
for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi) {
1170
uintptr_t MBBAddr = getMachineBasicBlockAddress(MBBs[mi]);
1171
/// FIXME: USe EntryKind instead of magic "getPICJumpTableEntry" hook.
1172
*SlotPtr++ = TheJIT->getJITInfo().getPICJumpTableEntry(MBBAddr, Base);
1180
void JITEmitter::startGVStub(const GlobalValue* GV,
1181
unsigned StubSize, unsigned Alignment) {
1182
SavedBufferBegin = BufferBegin;
1183
SavedBufferEnd = BufferEnd;
1184
SavedCurBufferPtr = CurBufferPtr;
1186
BufferBegin = CurBufferPtr = MemMgr->allocateStub(GV, StubSize, Alignment);
1187
BufferEnd = BufferBegin+StubSize+1;
1190
void JITEmitter::startGVStub(void *Buffer, unsigned StubSize) {
1191
SavedBufferBegin = BufferBegin;
1192
SavedBufferEnd = BufferEnd;
1193
SavedCurBufferPtr = CurBufferPtr;
1195
BufferBegin = CurBufferPtr = (uint8_t *)Buffer;
1196
BufferEnd = BufferBegin+StubSize+1;
1199
void JITEmitter::finishGVStub() {
1200
assert(CurBufferPtr != BufferEnd && "Stub overflowed allocated space.");
1201
NumBytes += getCurrentPCOffset();
1202
BufferBegin = SavedBufferBegin;
1203
BufferEnd = SavedBufferEnd;
1204
CurBufferPtr = SavedCurBufferPtr;
1207
void *JITEmitter::allocIndirectGV(const GlobalValue *GV,
1208
const uint8_t *Buffer, size_t Size,
1209
unsigned Alignment) {
1210
uint8_t *IndGV = MemMgr->allocateStub(GV, Size, Alignment);
1211
memcpy(IndGV, Buffer, Size);
1215
// getConstantPoolEntryAddress - Return the address of the 'ConstantNum' entry
1216
// in the constant pool that was last emitted with the 'emitConstantPool'
1219
uintptr_t JITEmitter::getConstantPoolEntryAddress(unsigned ConstantNum) const {
1220
assert(ConstantNum < ConstantPool->getConstants().size() &&
1221
"Invalid ConstantPoolIndex!");
1222
return ConstPoolAddresses[ConstantNum];
1225
// getJumpTableEntryAddress - Return the address of the JumpTable with index
1226
// 'Index' in the jumpp table that was last initialized with 'initJumpTableInfo'
1228
uintptr_t JITEmitter::getJumpTableEntryAddress(unsigned Index) const {
1229
const std::vector<MachineJumpTableEntry> &JT = JumpTable->getJumpTables();
1230
assert(Index < JT.size() && "Invalid jump table index!");
1232
unsigned EntrySize = JumpTable->getEntrySize(*TheJIT->getTargetData());
1234
unsigned Offset = 0;
1235
for (unsigned i = 0; i < Index; ++i)
1236
Offset += JT[i].MBBs.size();
1238
Offset *= EntrySize;
1240
return (uintptr_t)((char *)JumpTableBase + Offset);
1243
void JITEmitter::EmittedFunctionConfig::onDelete(
1244
JITEmitter *Emitter, const Function *F) {
1245
Emitter->deallocateMemForFunction(F);
1247
void JITEmitter::EmittedFunctionConfig::onRAUW(
1248
JITEmitter *, const Function*, const Function*) {
1249
llvm_unreachable("The JIT doesn't know how to handle a"
1250
" RAUW on a value it has emitted.");
1254
//===----------------------------------------------------------------------===//
1255
// Public interface to this file
1256
//===----------------------------------------------------------------------===//
1258
JITCodeEmitter *JIT::createEmitter(JIT &jit, JITMemoryManager *JMM,
1259
TargetMachine &tm) {
1260
return new JITEmitter(jit, JMM, tm);
1263
// getPointerToFunctionOrStub - If the specified function has been
1264
// code-gen'd, return a pointer to the function. If not, compile it, or use
1265
// a stub to implement lazy compilation if available.
1267
void *JIT::getPointerToFunctionOrStub(Function *F) {
1268
// If we have already code generated the function, just return the address.
1269
if (void *Addr = getPointerToGlobalIfAvailable(F))
1272
// Get a stub if the target supports it.
1273
assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
1274
JITEmitter *JE = cast<JITEmitter>(getCodeEmitter());
1275
return JE->getJITResolver().getLazyFunctionStub(F);
1278
void JIT::updateFunctionStub(Function *F) {
1279
// Get the empty stub we generated earlier.
1280
assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
1281
JITEmitter *JE = cast<JITEmitter>(getCodeEmitter());
1282
void *Stub = JE->getJITResolver().getLazyFunctionStub(F);
1283
void *Addr = getPointerToGlobalIfAvailable(F);
1284
assert(Addr != Stub && "Function must have non-stub address to be updated.");
1286
// Tell the target jit info to rewrite the stub at the specified address,
1287
// rather than creating a new one.
1288
TargetJITInfo::StubLayout layout = getJITInfo().getStubLayout();
1289
JE->startGVStub(Stub, layout.Size);
1290
getJITInfo().emitFunctionStub(F, Addr, *getCodeEmitter());
1294
/// freeMachineCodeForFunction - release machine code memory for given Function.
1296
void JIT::freeMachineCodeForFunction(Function *F) {
1297
// Delete translation for this from the ExecutionEngine, so it will get
1298
// retranslated next time it is used.
1299
updateGlobalMapping(F, 0);
1301
// Free the actual memory for the function body and related stuff.
1302
assert(isa<JITEmitter>(JCE) && "Unexpected MCE?");
1303
cast<JITEmitter>(JCE)->deallocateMemForFunction(F);
added
removed
libclamav/c++/llvm/lib/ExecutionEngine/JIT/JITEmitter.cpp
