mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-23 15:29:51 +00:00
dced3cdb04
Patch by Michael Muller. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172214 91177308-0d34-0410-b5e6-96231b3b80d8
1302 lines
48 KiB
C++
1302 lines
48 KiB
C++
//===-- JITEmitter.cpp - Write machine code to executable memory ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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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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//===----------------------------------------------------------------------===//
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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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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "jit"
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#include "JIT.h"
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#include "JITDwarfEmitter.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/OwningPtr.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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#include "llvm/CodeGen/JITCodeEmitter.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/MachineFunction.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/DebugInfo.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/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Disassembler.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/Memory.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/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 <algorithm>
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#ifndef NDEBUG
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#include <iomanip>
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#endif
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using namespace llvm;
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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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//===----------------------------------------------------------------------===//
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// JIT lazy compilation code.
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//
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namespace {
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class JITEmitter;
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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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llvm_unreachable("The JIT doesn't know how to handle a"
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" RAUW on a value it has emitted.");
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}
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};
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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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};
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class JITResolverState {
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public:
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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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private:
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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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#ifndef NDEBUG
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/// Instance of the JIT this ResolverState serves.
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JIT *TheJIT;
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#endif
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public:
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JITResolverState(JIT *jit) : FunctionToLazyStubMap(this),
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FunctionToCallSitesMap(this) {
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#ifndef NDEBUG
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TheJIT = jit;
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#endif
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}
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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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}
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GlobalToIndirectSymMapTy& getGlobalToIndirectSymMap(const MutexGuard& lck) {
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assert(lck.holds(TheJIT->lock));
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return GlobalToIndirectSymMap;
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}
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std::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
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// might be a little bit after the stub. As such, use upper_bound to
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// 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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--I;
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return *I;
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}
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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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(void)Inserted;
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assert(Inserted && "Pair was already in CallSiteToFunctionMap");
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FunctionToCallSitesMap[F].insert(CallSite);
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}
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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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// ~JITResolver().
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void EraseAllCallSitesPrelocked();
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};
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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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class JITResolver {
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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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JITEmitter &JE;
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/// Instance of JIT corresponding to this Resolver.
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JIT *TheJIT;
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public:
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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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}
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~JITResolver();
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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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};
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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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///
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/// Guarded by Lock.
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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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public:
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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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}
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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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Map.erase(Stub);
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}
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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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// JITResolverState.
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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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--I;
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return I->second;
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}
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/// True if any stubs refer to the given resolver. Only used in an assert().
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/// O(N)
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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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return true;
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}
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return false;
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}
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};
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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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/// emitted.
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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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///
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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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///
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void *ConstantPoolBase;
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/// ConstPoolAddresses - Addresses of individual constant pool entries.
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///
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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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///
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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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///
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void *JumpTableBase;
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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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/// LabelLocations - This vector is a mapping from Label ID's to their
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/// address.
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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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// finishFunction().
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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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/// finishFunction.
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JITEvent_EmittedFunctionDetails EmissionDetails;
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struct EmittedCode {
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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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};
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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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};
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ValueMap<const Function *, EmittedCode,
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EmittedFunctionConfig> EmittedFunctions;
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DebugLoc PrevDL;
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/// Instance of the JIT
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JIT *TheJIT;
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bool JITExceptionHandling;
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public:
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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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JITExceptionHandling(TM.Options.JITExceptionHandling) {
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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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}
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if (JITExceptionHandling) {
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DE.reset(new JITDwarfEmitter(jit));
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}
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}
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~JITEmitter() {
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delete MemMgr;
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}
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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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void finishGVStub();
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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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unsigned Alignment);
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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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}
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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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}
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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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}
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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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/// function body.
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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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}
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virtual DenseMap<MCSymbol*, uintptr_t> *getLabelLocations() {
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return &LabelLocations;
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}
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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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}
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virtual void setModuleInfo(MachineModuleInfo* Info) {
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MMI = Info;
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if (DE.get()) DE->setModuleInfo(Info);
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}
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private:
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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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};
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}
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void CallSiteValueMapConfig::onDelete(JITResolverState *JRS, Function *F) {
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JRS->EraseAllCallSitesForPrelocked(F);
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}
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void JITResolverState::EraseAllCallSitesForPrelocked(Function *F) {
|
|
FunctionToCallSitesMapTy::iterator F2C = FunctionToCallSitesMap.find(F);
|
|
if (F2C == FunctionToCallSitesMap.end())
|
|
return;
|
|
StubToResolverMapTy &S2RMap = *StubToResolverMap;
|
|
for (SmallPtrSet<void*, 1>::const_iterator I = F2C->second.begin(),
|
|
E = F2C->second.end(); I != E; ++I) {
|
|
S2RMap.UnregisterStubResolver(*I);
|
|
bool Erased = CallSiteToFunctionMap.erase(*I);
|
|
(void)Erased;
|
|
assert(Erased && "Missing call site->function mapping");
|
|
}
|
|
FunctionToCallSitesMap.erase(F2C);
|
|
}
|
|
|
|
void JITResolverState::EraseAllCallSitesPrelocked() {
|
|
StubToResolverMapTy &S2RMap = *StubToResolverMap;
|
|
for (CallSiteToFunctionMapTy::const_iterator
|
|
I = CallSiteToFunctionMap.begin(),
|
|
E = CallSiteToFunctionMap.end(); I != E; ++I) {
|
|
S2RMap.UnregisterStubResolver(I->first);
|
|
}
|
|
CallSiteToFunctionMap.clear();
|
|
FunctionToCallSitesMap.clear();
|
|
}
|
|
|
|
JITResolver::~JITResolver() {
|
|
// No need to lock because we're in the destructor, and state isn't shared.
|
|
state.EraseAllCallSitesPrelocked();
|
|
assert(!StubToResolverMap->ResolverHasStubs(this) &&
|
|
"Resolver destroyed with stubs still alive.");
|
|
}
|
|
|
|
/// getLazyFunctionStubIfAvailable - This returns a pointer to a function stub
|
|
/// if it has already been created.
|
|
void *JITResolver::getLazyFunctionStubIfAvailable(Function *F) {
|
|
MutexGuard locked(TheJIT->lock);
|
|
|
|
// If we already have a stub for this function, recycle it.
|
|
return state.getFunctionToLazyStubMap(locked).lookup(F);
|
|
}
|
|
|
|
/// getFunctionStub - This returns a pointer to a function stub, creating
|
|
/// one on demand as needed.
|
|
void *JITResolver::getLazyFunctionStub(Function *F) {
|
|
MutexGuard locked(TheJIT->lock);
|
|
|
|
// If we already have a lazy stub for this function, recycle it.
|
|
void *&Stub = state.getFunctionToLazyStubMap(locked)[F];
|
|
if (Stub) return Stub;
|
|
|
|
// 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 (isNonGhostDeclaration(F) || F->hasAvailableExternallyLinkage()) {
|
|
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 (!Actual) return 0;
|
|
}
|
|
|
|
TargetJITInfo::StubLayout SL = TheJIT->getJITInfo().getStubLayout();
|
|
JE.startGVStub(F, SL.Size, SL.Alignment);
|
|
// 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, JE);
|
|
JE.finishGVStub();
|
|
|
|
if (Actual != (void*)(intptr_t)LazyResolverFn) {
|
|
// If we are getting the stub for an external function, we really want the
|
|
// address of the stub in the GlobalAddressMap for the JIT, not the address
|
|
// of the external function.
|
|
TheJIT->updateGlobalMapping(F, Stub);
|
|
}
|
|
|
|
DEBUG(dbgs() << "JIT: Lazy stub emitted at [" << Stub << "] for function '"
|
|
<< F->getName() << "'\n");
|
|
|
|
if (TheJIT->isCompilingLazily()) {
|
|
// Register this JITResolver as the one corresponding to this call site so
|
|
// JITCompilerFn will be able to find it.
|
|
StubToResolverMap->RegisterStubResolver(Stub, this);
|
|
|
|
// Finally, keep track of the stub-to-Function mapping so that the
|
|
// JITCompilerFn knows which function to compile!
|
|
state.AddCallSite(locked, Stub, F);
|
|
} else if (!Actual) {
|
|
// 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.
|
|
assert(!isNonGhostDeclaration(F) && !F->hasAvailableExternallyLinkage() &&
|
|
"'Actual' should have been set above.");
|
|
TheJIT->addPendingFunction(F);
|
|
}
|
|
|
|
return Stub;
|
|
}
|
|
|
|
/// getGlobalValueIndirectSym - Return a lazy pointer containing the specified
|
|
/// GV address.
|
|
void *JITResolver::getGlobalValueIndirectSym(GlobalValue *GV, void *GVAddress) {
|
|
MutexGuard locked(TheJIT->lock);
|
|
|
|
// If we already have a stub for this global variable, recycle it.
|
|
void *&IndirectSym = state.getGlobalToIndirectSymMap(locked)[GV];
|
|
if (IndirectSym) return IndirectSym;
|
|
|
|
// Otherwise, codegen a new indirect symbol.
|
|
IndirectSym = TheJIT->getJITInfo().emitGlobalValueIndirectSym(GV, GVAddress,
|
|
JE);
|
|
|
|
DEBUG(dbgs() << "JIT: Indirect symbol emitted at [" << IndirectSym
|
|
<< "] for GV '" << GV->getName() << "'\n");
|
|
|
|
return IndirectSym;
|
|
}
|
|
|
|
/// getExternalFunctionStub - Return a stub for the function at the
|
|
/// specified address, created lazily on demand.
|
|
void *JITResolver::getExternalFunctionStub(void *FnAddr) {
|
|
// If we already have a stub for this function, recycle it.
|
|
void *&Stub = ExternalFnToStubMap[FnAddr];
|
|
if (Stub) return Stub;
|
|
|
|
TargetJITInfo::StubLayout SL = TheJIT->getJITInfo().getStubLayout();
|
|
JE.startGVStub(0, SL.Size, SL.Alignment);
|
|
Stub = TheJIT->getJITInfo().emitFunctionStub(0, FnAddr, JE);
|
|
JE.finishGVStub();
|
|
|
|
DEBUG(dbgs() << "JIT: Stub emitted at [" << Stub
|
|
<< "] for external function at '" << FnAddr << "'\n");
|
|
return Stub;
|
|
}
|
|
|
|
unsigned JITResolver::getGOTIndexForAddr(void* addr) {
|
|
unsigned idx = revGOTMap[addr];
|
|
if (!idx) {
|
|
idx = ++nextGOTIndex;
|
|
revGOTMap[addr] = idx;
|
|
DEBUG(dbgs() << "JIT: Adding GOT entry " << idx << " for addr ["
|
|
<< addr << "]\n");
|
|
}
|
|
return idx;
|
|
}
|
|
|
|
/// JITCompilerFn - This function is called when a lazy compilation stub has
|
|
/// been entered. It looks up which function this stub corresponds to, compiles
|
|
/// it if necessary, then returns the resultant function pointer.
|
|
void *JITResolver::JITCompilerFn(void *Stub) {
|
|
JITResolver *JR = StubToResolverMap->getResolverFromStub(Stub);
|
|
assert(JR && "Unable to find the corresponding JITResolver to the call site");
|
|
|
|
Function* F = 0;
|
|
void* ActualPtr = 0;
|
|
|
|
{
|
|
// Only lock for getting the Function. The call getPointerToFunction made
|
|
// in this function might trigger function materializing, which requires
|
|
// JIT lock to be unlocked.
|
|
MutexGuard locked(JR->TheJIT->lock);
|
|
|
|
// The address given to us for the stub may not be exactly right, it might
|
|
// be a little bit after the stub. As such, use upper_bound to find it.
|
|
std::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 = JR->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 (!JR->TheJIT->isCompilingLazily()) {
|
|
report_fatal_error("LLVM JIT requested to do lazy compilation of"
|
|
" function '"
|
|
+ F->getName() + "' when lazy compiles are disabled!");
|
|
}
|
|
|
|
DEBUG(dbgs() << "JIT: Lazily resolving function '" << F->getName()
|
|
<< "' In stub ptr = " << Stub << " actual ptr = "
|
|
<< ActualPtr << "\n");
|
|
(void)ActualPtr;
|
|
|
|
Result = JR->TheJIT->getPointerToFunction(F);
|
|
}
|
|
|
|
// Reacquire the lock to update the GOT map.
|
|
MutexGuard locked(JR->TheJIT->lock);
|
|
|
|
// 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.
|
|
|
|
// What we will do is set the compiled function address to map to the
|
|
// same GOT entry as the stub so that later clients may update the GOT
|
|
// if they see it still using the stub address.
|
|
// Note: this is done so the Resolver doesn't have to manage GOT memory
|
|
// Do this without allocating map space if the target isn't using a GOT
|
|
if(JR->revGOTMap.find(Stub) != JR->revGOTMap.end())
|
|
JR->revGOTMap[Result] = JR->revGOTMap[Stub];
|
|
|
|
return Result;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// JITEmitter code.
|
|
//
|
|
void *JITEmitter::getPointerToGlobal(GlobalValue *V, void *Reference,
|
|
bool MayNeedFarStub) {
|
|
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V))
|
|
return TheJIT->getOrEmitGlobalVariable(GV);
|
|
|
|
if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
|
|
return TheJIT->getPointerToGlobal(GA->resolveAliasedGlobal(false));
|
|
|
|
// If we have already compiled the function, return a pointer to its body.
|
|
Function *F = cast<Function>(V);
|
|
|
|
void *FnStub = Resolver.getLazyFunctionStubIfAvailable(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. TODO: Yes, this is wrong. The lazy stub isn't guaranteed to be
|
|
// close enough to call.
|
|
return FnStub;
|
|
}
|
|
|
|
// If we know the target can handle arbitrary-distance calls, try to
|
|
// return a direct pointer.
|
|
if (!MayNeedFarStub) {
|
|
// 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.
|
|
if (isNonGhostDeclaration(F) || F->hasAvailableExternallyLinkage())
|
|
return TheJIT->getPointerToFunction(F);
|
|
}
|
|
|
|
// Otherwise, we may need a to emit a stub, and, conservatively, we always do
|
|
// so. Note that it's possible to return null from getLazyFunctionStub in the
|
|
// case of a weak extern that fails to resolve.
|
|
return Resolver.getLazyFunctionStub(F);
|
|
}
|
|
|
|
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, false);
|
|
void *StubAddr = Resolver.getGlobalValueIndirectSym(V, GVAddress);
|
|
return StubAddr;
|
|
}
|
|
|
|
void JITEmitter::processDebugLoc(DebugLoc DL, bool BeforePrintingInsn) {
|
|
if (DL.isUnknown()) return;
|
|
if (!BeforePrintingInsn) return;
|
|
|
|
const LLVMContext &Context = EmissionDetails.MF->getFunction()->getContext();
|
|
|
|
if (DL.getScope(Context) != 0 && PrevDL != DL) {
|
|
JITEvent_EmittedFunctionDetails::LineStart NextLine;
|
|
NextLine.Address = getCurrentPCValue();
|
|
NextLine.Loc = DL;
|
|
EmissionDetails.LineStarts.push_back(NextLine);
|
|
}
|
|
|
|
PrevDL = DL;
|
|
}
|
|
|
|
static unsigned GetConstantPoolSizeInBytes(MachineConstantPool *MCP,
|
|
const DataLayout *TD) {
|
|
const std::vector<MachineConstantPoolEntry> &Constants = MCP->getConstants();
|
|
if (Constants.empty()) return 0;
|
|
|
|
unsigned Size = 0;
|
|
for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
|
|
MachineConstantPoolEntry CPE = Constants[i];
|
|
unsigned AlignMask = CPE.getAlignment() - 1;
|
|
Size = (Size + AlignMask) & ~AlignMask;
|
|
Type *Ty = CPE.getType();
|
|
Size += TD->getTypeAllocSize(Ty);
|
|
}
|
|
return Size;
|
|
}
|
|
|
|
void JITEmitter::startFunction(MachineFunction &F) {
|
|
DEBUG(dbgs() << "JIT: Starting CodeGen of Function "
|
|
<< F.getName() << "\n");
|
|
|
|
uintptr_t ActualSize = 0;
|
|
// Set the memory writable, if it's not already
|
|
MemMgr->setMemoryWritable();
|
|
|
|
if (SizeEstimate > 0) {
|
|
// SizeEstimate will be non-zero on reallocation attempts.
|
|
ActualSize = SizeEstimate;
|
|
}
|
|
|
|
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);
|
|
|
|
emitConstantPool(F.getConstantPool());
|
|
if (MachineJumpTableInfo *MJTI = F.getJumpTableInfo())
|
|
initJumpTableInfo(MJTI);
|
|
|
|
// 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();
|
|
|
|
EmissionDetails.MF = &F;
|
|
EmissionDetails.LineStarts.clear();
|
|
}
|
|
|
|
bool JITEmitter::finishFunction(MachineFunction &F) {
|
|
if (CurBufferPtr == BufferEnd) {
|
|
// We must call endFunctionBody before retrying, because
|
|
// deallocateMemForFunction requires it.
|
|
MemMgr->endFunctionBody(F.getFunction(), BufferBegin, CurBufferPtr);
|
|
retryWithMoreMemory(F);
|
|
return true;
|
|
}
|
|
|
|
if (MachineJumpTableInfo *MJTI = F.getJumpTableInfo())
|
|
emitJumpTableInfo(MJTI);
|
|
|
|
// FnStart is the start of the text, not the start of the constant pool and
|
|
// other per-function data.
|
|
uint8_t *FnStart =
|
|
(uint8_t *)TheJIT->getPointerToGlobalIfAvailable(F.getFunction());
|
|
|
|
// FnEnd is the end of the function's machine code.
|
|
uint8_t *FnEnd = CurBufferPtr;
|
|
|
|
if (!Relocations.empty()) {
|
|
CurFn = F.getFunction();
|
|
NumRelos += Relocations.size();
|
|
|
|
// Resolve the relocations to concrete pointers.
|
|
for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
|
|
MachineRelocation &MR = Relocations[i];
|
|
void *ResultPtr = 0;
|
|
if (!MR.letTargetResolve()) {
|
|
if (MR.isExternalSymbol()) {
|
|
ResultPtr = TheJIT->getPointerToNamedFunction(MR.getExternalSymbol(),
|
|
false);
|
|
DEBUG(dbgs() << "JIT: Map \'" << MR.getExternalSymbol() << "\' to ["
|
|
<< ResultPtr << "]\n");
|
|
|
|
// If the target REALLY wants a stub for this function, emit it now.
|
|
if (MR.mayNeedFarStub()) {
|
|
ResultPtr = Resolver.getExternalFunctionStub(ResultPtr);
|
|
}
|
|
} else if (MR.isGlobalValue()) {
|
|
ResultPtr = getPointerToGlobal(MR.getGlobalValue(),
|
|
BufferBegin+MR.getMachineCodeOffset(),
|
|
MR.mayNeedFarStub());
|
|
} else if (MR.isIndirectSymbol()) {
|
|
ResultPtr = getPointerToGVIndirectSym(
|
|
MR.getGlobalValue(), BufferBegin+MR.getMachineCodeOffset());
|
|
} else if (MR.isBasicBlock()) {
|
|
ResultPtr = (void*)getMachineBasicBlockAddress(MR.getBasicBlock());
|
|
} else if (MR.isConstantPoolIndex()) {
|
|
ResultPtr =
|
|
(void*)getConstantPoolEntryAddress(MR.getConstantPoolIndex());
|
|
} else {
|
|
assert(MR.isJumpTableIndex());
|
|
ResultPtr=(void*)getJumpTableEntryAddress(MR.getJumpTableIndex());
|
|
}
|
|
|
|
MR.setResultPointer(ResultPtr);
|
|
}
|
|
|
|
// if we are managing the GOT and the relocation wants an index,
|
|
// give it one
|
|
if (MR.isGOTRelative() && MemMgr->isManagingGOT()) {
|
|
unsigned idx = Resolver.getGOTIndexForAddr(ResultPtr);
|
|
MR.setGOTIndex(idx);
|
|
if (((void**)MemMgr->getGOTBase())[idx] != ResultPtr) {
|
|
DEBUG(dbgs() << "JIT: GOT was out of date for " << ResultPtr
|
|
<< " pointing at " << ((void**)MemMgr->getGOTBase())[idx]
|
|
<< "\n");
|
|
((void**)MemMgr->getGOTBase())[idx] = ResultPtr;
|
|
}
|
|
}
|
|
}
|
|
|
|
CurFn = 0;
|
|
TheJIT->getJITInfo().relocate(BufferBegin, &Relocations[0],
|
|
Relocations.size(), MemMgr->getGOTBase());
|
|
}
|
|
|
|
// Update the GOT entry for F to point to the new code.
|
|
if (MemMgr->isManagingGOT()) {
|
|
unsigned idx = Resolver.getGOTIndexForAddr((void*)BufferBegin);
|
|
if (((void**)MemMgr->getGOTBase())[idx] != (void*)BufferBegin) {
|
|
DEBUG(dbgs() << "JIT: GOT was out of date for " << (void*)BufferBegin
|
|
<< " pointing at " << ((void**)MemMgr->getGOTBase())[idx]
|
|
<< "\n");
|
|
((void**)MemMgr->getGOTBase())[idx] = (void*)BufferBegin;
|
|
}
|
|
}
|
|
|
|
// CurBufferPtr may have moved beyond FnEnd, due to memory allocation for
|
|
// global variables that were referenced in the relocations.
|
|
MemMgr->endFunctionBody(F.getFunction(), BufferBegin, CurBufferPtr);
|
|
|
|
if (CurBufferPtr == BufferEnd) {
|
|
retryWithMoreMemory(F);
|
|
return true;
|
|
} else {
|
|
// Now that we've succeeded in emitting the function, reset the
|
|
// SizeEstimate back down to zero.
|
|
SizeEstimate = 0;
|
|
}
|
|
|
|
BufferBegin = CurBufferPtr = 0;
|
|
NumBytes += FnEnd-FnStart;
|
|
|
|
// Invalidate the icache if necessary.
|
|
sys::Memory::InvalidateInstructionCache(FnStart, FnEnd-FnStart);
|
|
|
|
TheJIT->NotifyFunctionEmitted(*F.getFunction(), FnStart, FnEnd-FnStart,
|
|
EmissionDetails);
|
|
|
|
// Reset the previous debug location.
|
|
PrevDL = DebugLoc();
|
|
|
|
DEBUG(dbgs() << "JIT: Finished CodeGen of [" << (void*)FnStart
|
|
<< "] Function: " << F.getName()
|
|
<< ": " << (FnEnd-FnStart) << " bytes of text, "
|
|
<< Relocations.size() << " relocations\n");
|
|
|
|
Relocations.clear();
|
|
ConstPoolAddresses.clear();
|
|
|
|
// Mark code region readable and executable if it's not so already.
|
|
MemMgr->setMemoryExecutable();
|
|
|
|
DEBUG({
|
|
if (sys::hasDisassembler()) {
|
|
dbgs() << "JIT: Disassembled code:\n";
|
|
dbgs() << sys::disassembleBuffer(FnStart, FnEnd-FnStart,
|
|
(uintptr_t)FnStart);
|
|
} else {
|
|
dbgs() << "JIT: Binary code:\n";
|
|
uint8_t* q = FnStart;
|
|
for (int i = 0; q < FnEnd; q += 4, ++i) {
|
|
if (i == 4)
|
|
i = 0;
|
|
if (i == 0)
|
|
dbgs() << "JIT: " << (long)(q - FnStart) << ": ";
|
|
bool Done = false;
|
|
for (int j = 3; j >= 0; --j) {
|
|
if (q + j >= FnEnd)
|
|
Done = true;
|
|
else
|
|
dbgs() << (unsigned short)q[j];
|
|
}
|
|
if (Done)
|
|
break;
|
|
dbgs() << ' ';
|
|
if (i == 3)
|
|
dbgs() << '\n';
|
|
}
|
|
dbgs()<< '\n';
|
|
}
|
|
});
|
|
|
|
if (JITExceptionHandling) {
|
|
uintptr_t ActualSize = 0;
|
|
SavedBufferBegin = BufferBegin;
|
|
SavedBufferEnd = BufferEnd;
|
|
SavedCurBufferPtr = CurBufferPtr;
|
|
uint8_t *FrameRegister;
|
|
|
|
while (true) {
|
|
BufferBegin = CurBufferPtr = MemMgr->startExceptionTable(F.getFunction(),
|
|
ActualSize);
|
|
BufferEnd = BufferBegin+ActualSize;
|
|
EmittedFunctions[F.getFunction()].ExceptionTable = BufferBegin;
|
|
uint8_t *EhStart;
|
|
FrameRegister = DE->EmitDwarfTable(F, *this, FnStart, FnEnd, EhStart);
|
|
|
|
// If the buffer was large enough to hold the table then we are done.
|
|
if (CurBufferPtr != BufferEnd)
|
|
break;
|
|
|
|
// Try again with twice as much space.
|
|
ActualSize = (CurBufferPtr - BufferBegin) * 2;
|
|
MemMgr->deallocateExceptionTable(BufferBegin);
|
|
}
|
|
MemMgr->endExceptionTable(F.getFunction(), BufferBegin, CurBufferPtr,
|
|
FrameRegister);
|
|
BufferBegin = SavedBufferBegin;
|
|
BufferEnd = SavedBufferEnd;
|
|
CurBufferPtr = SavedCurBufferPtr;
|
|
|
|
if (JITExceptionHandling) {
|
|
TheJIT->RegisterTable(F.getFunction(), FrameRegister);
|
|
}
|
|
}
|
|
|
|
if (MMI)
|
|
MMI->EndFunction();
|
|
|
|
return false;
|
|
}
|
|
|
|
void JITEmitter::retryWithMoreMemory(MachineFunction &F) {
|
|
DEBUG(dbgs() << "JIT: Ran out of space for native code. Reattempting.\n");
|
|
Relocations.clear(); // Clear the old relocations or we'll reapply them.
|
|
ConstPoolAddresses.clear();
|
|
++NumRetries;
|
|
deallocateMemForFunction(F.getFunction());
|
|
// Try again with at least twice as much free space.
|
|
SizeEstimate = (uintptr_t)(2 * (BufferEnd - BufferBegin));
|
|
|
|
for (MachineFunction::iterator MBB = F.begin(), E = F.end(); MBB != E; ++MBB){
|
|
if (MBB->hasAddressTaken())
|
|
TheJIT->clearPointerToBasicBlock(MBB->getBasicBlock());
|
|
}
|
|
}
|
|
|
|
/// 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) {
|
|
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);
|
|
}
|
|
|
|
if (JITExceptionHandling) {
|
|
TheJIT->DeregisterTable(F);
|
|
}
|
|
}
|
|
|
|
|
|
void *JITEmitter::allocateSpace(uintptr_t Size, unsigned Alignment) {
|
|
if (BufferBegin)
|
|
return JITCodeEmitter::allocateSpace(Size, Alignment);
|
|
|
|
// create a new memory block if there is no active one.
|
|
// care must be taken so that BufferBegin is invalidated when a
|
|
// block is trimmed
|
|
BufferBegin = CurBufferPtr = MemMgr->allocateSpace(Size, Alignment);
|
|
BufferEnd = BufferBegin+Size;
|
|
return CurBufferPtr;
|
|
}
|
|
|
|
void *JITEmitter::allocateGlobal(uintptr_t Size, unsigned Alignment) {
|
|
// Delegate this call through the memory manager.
|
|
return MemMgr->allocateGlobal(Size, Alignment);
|
|
}
|
|
|
|
void JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
|
|
if (TheJIT->getJITInfo().hasCustomConstantPool())
|
|
return;
|
|
|
|
const std::vector<MachineConstantPoolEntry> &Constants = MCP->getConstants();
|
|
if (Constants.empty()) return;
|
|
|
|
unsigned Size = GetConstantPoolSizeInBytes(MCP, TheJIT->getDataLayout());
|
|
unsigned Align = MCP->getConstantPoolAlignment();
|
|
ConstantPoolBase = allocateSpace(Size, Align);
|
|
ConstantPool = MCP;
|
|
|
|
if (ConstantPoolBase == 0) return; // Buffer overflow.
|
|
|
|
DEBUG(dbgs() << "JIT: Emitted constant pool at [" << ConstantPoolBase
|
|
<< "] (size: " << Size << ", alignment: " << Align << ")\n");
|
|
|
|
// Initialize the memory for all of the constant pool entries.
|
|
unsigned Offset = 0;
|
|
for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
|
|
MachineConstantPoolEntry CPE = Constants[i];
|
|
unsigned AlignMask = CPE.getAlignment() - 1;
|
|
Offset = (Offset + AlignMask) & ~AlignMask;
|
|
|
|
uintptr_t CAddr = (uintptr_t)ConstantPoolBase + Offset;
|
|
ConstPoolAddresses.push_back(CAddr);
|
|
if (CPE.isMachineConstantPoolEntry()) {
|
|
// FIXME: add support to lower machine constant pool values into bytes!
|
|
report_fatal_error("Initialize memory with machine specific constant pool"
|
|
"entry has not been implemented!");
|
|
}
|
|
TheJIT->InitializeMemory(CPE.Val.ConstVal, (void*)CAddr);
|
|
DEBUG(dbgs() << "JIT: CP" << i << " at [0x";
|
|
dbgs().write_hex(CAddr) << "]\n");
|
|
|
|
Type *Ty = CPE.Val.ConstVal->getType();
|
|
Offset += TheJIT->getDataLayout()->getTypeAllocSize(Ty);
|
|
}
|
|
}
|
|
|
|
void JITEmitter::initJumpTableInfo(MachineJumpTableInfo *MJTI) {
|
|
if (TheJIT->getJITInfo().hasCustomJumpTables())
|
|
return;
|
|
if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline)
|
|
return;
|
|
|
|
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();
|
|
|
|
unsigned EntrySize = MJTI->getEntrySize(*TheJIT->getDataLayout());
|
|
|
|
// Just allocate space for all the jump tables now. We will fix up the actual
|
|
// MBB entries in the tables after we emit the code for each block, since then
|
|
// we will know the final locations of the MBBs in memory.
|
|
JumpTable = MJTI;
|
|
JumpTableBase = allocateSpace(NumEntries * EntrySize,
|
|
MJTI->getEntryAlignment(*TheJIT->getDataLayout()));
|
|
}
|
|
|
|
void JITEmitter::emitJumpTableInfo(MachineJumpTableInfo *MJTI) {
|
|
if (TheJIT->getJITInfo().hasCustomJumpTables())
|
|
return;
|
|
|
|
const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
|
|
if (JT.empty() || JumpTableBase == 0) return;
|
|
|
|
|
|
switch (MJTI->getEntryKind()) {
|
|
case MachineJumpTableInfo::EK_Inline:
|
|
return;
|
|
case MachineJumpTableInfo::EK_BlockAddress: {
|
|
// EK_BlockAddress - Each entry is a plain address of block, e.g.:
|
|
// .word LBB123
|
|
assert(MJTI->getEntrySize(*TheJIT->getDataLayout()) == sizeof(void*) &&
|
|
"Cross JIT'ing?");
|
|
|
|
// For each jump table, map each target in the jump table to the address of
|
|
// an emitted MachineBasicBlock.
|
|
intptr_t *SlotPtr = (intptr_t*)JumpTableBase;
|
|
|
|
for (unsigned i = 0, e = JT.size(); i != e; ++i) {
|
|
const std::vector<MachineBasicBlock*> &MBBs = JT[i].MBBs;
|
|
// Store the address of the basic block for this jump table slot in the
|
|
// memory we allocated for the jump table in 'initJumpTableInfo'
|
|
for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi)
|
|
*SlotPtr++ = getMachineBasicBlockAddress(MBBs[mi]);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MachineJumpTableInfo::EK_Custom32:
|
|
case MachineJumpTableInfo::EK_GPRel32BlockAddress:
|
|
case MachineJumpTableInfo::EK_LabelDifference32: {
|
|
assert(MJTI->getEntrySize(*TheJIT->getDataLayout()) == 4&&"Cross JIT'ing?");
|
|
// For each jump table, place the offset from the beginning of the table
|
|
// to the target address.
|
|
int *SlotPtr = (int*)JumpTableBase;
|
|
|
|
for (unsigned i = 0, e = JT.size(); i != e; ++i) {
|
|
const std::vector<MachineBasicBlock*> &MBBs = JT[i].MBBs;
|
|
// Store the offset of the basic block for this jump table slot in the
|
|
// memory we allocated for the jump table in 'initJumpTableInfo'
|
|
uintptr_t Base = (uintptr_t)SlotPtr;
|
|
for (unsigned mi = 0, me = MBBs.size(); mi != me; ++mi) {
|
|
uintptr_t MBBAddr = getMachineBasicBlockAddress(MBBs[mi]);
|
|
/// FIXME: USe EntryKind instead of magic "getPICJumpTableEntry" hook.
|
|
*SlotPtr++ = TheJIT->getJITInfo().getPICJumpTableEntry(MBBAddr, Base);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case MachineJumpTableInfo::EK_GPRel64BlockAddress:
|
|
llvm_unreachable(
|
|
"JT Info emission not implemented for GPRel64BlockAddress yet.");
|
|
}
|
|
}
|
|
|
|
void JITEmitter::startGVStub(const GlobalValue* GV,
|
|
unsigned StubSize, unsigned Alignment) {
|
|
SavedBufferBegin = BufferBegin;
|
|
SavedBufferEnd = BufferEnd;
|
|
SavedCurBufferPtr = CurBufferPtr;
|
|
|
|
BufferBegin = CurBufferPtr = MemMgr->allocateStub(GV, StubSize, Alignment);
|
|
BufferEnd = BufferBegin+StubSize+1;
|
|
}
|
|
|
|
void JITEmitter::startGVStub(void *Buffer, unsigned StubSize) {
|
|
SavedBufferBegin = BufferBegin;
|
|
SavedBufferEnd = BufferEnd;
|
|
SavedCurBufferPtr = CurBufferPtr;
|
|
|
|
BufferBegin = CurBufferPtr = (uint8_t *)Buffer;
|
|
BufferEnd = BufferBegin+StubSize+1;
|
|
}
|
|
|
|
void JITEmitter::finishGVStub() {
|
|
assert(CurBufferPtr != BufferEnd && "Stub overflowed allocated space.");
|
|
NumBytes += getCurrentPCOffset();
|
|
BufferBegin = SavedBufferBegin;
|
|
BufferEnd = SavedBufferEnd;
|
|
CurBufferPtr = SavedCurBufferPtr;
|
|
}
|
|
|
|
void *JITEmitter::allocIndirectGV(const GlobalValue *GV,
|
|
const uint8_t *Buffer, size_t Size,
|
|
unsigned Alignment) {
|
|
uint8_t *IndGV = MemMgr->allocateStub(GV, Size, Alignment);
|
|
memcpy(IndGV, Buffer, Size);
|
|
return IndGV;
|
|
}
|
|
|
|
// getConstantPoolEntryAddress - Return the address of the 'ConstantNum' entry
|
|
// in the constant pool that was last emitted with the 'emitConstantPool'
|
|
// method.
|
|
//
|
|
uintptr_t JITEmitter::getConstantPoolEntryAddress(unsigned ConstantNum) const {
|
|
assert(ConstantNum < ConstantPool->getConstants().size() &&
|
|
"Invalid ConstantPoolIndex!");
|
|
return ConstPoolAddresses[ConstantNum];
|
|
}
|
|
|
|
// getJumpTableEntryAddress - Return the address of the JumpTable with index
|
|
// 'Index' in the jumpp table that was last initialized with 'initJumpTableInfo'
|
|
//
|
|
uintptr_t JITEmitter::getJumpTableEntryAddress(unsigned Index) const {
|
|
const std::vector<MachineJumpTableEntry> &JT = JumpTable->getJumpTables();
|
|
assert(Index < JT.size() && "Invalid jump table index!");
|
|
|
|
unsigned EntrySize = JumpTable->getEntrySize(*TheJIT->getDataLayout());
|
|
|
|
unsigned Offset = 0;
|
|
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
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
JITCodeEmitter *JIT::createEmitter(JIT &jit, JITMemoryManager *JMM,
|
|
TargetMachine &tm) {
|
|
return new JITEmitter(jit, JMM, tm);
|
|
}
|
|
|
|
// getPointerToFunctionOrStub - If the specified function has been
|
|
// code-gen'd, return a pointer to the function. If not, compile it, or use
|
|
// a stub to implement lazy compilation if available.
|
|
//
|
|
void *JIT::getPointerToFunctionOrStub(Function *F) {
|
|
// If we have already code generated the function, just return the address.
|
|
if (void *Addr = getPointerToGlobalIfAvailable(F))
|
|
return Addr;
|
|
|
|
// Get a stub if the target supports it.
|
|
JITEmitter *JE = static_cast<JITEmitter*>(getCodeEmitter());
|
|
return JE->getJITResolver().getLazyFunctionStub(F);
|
|
}
|
|
|
|
void JIT::updateFunctionStub(Function *F) {
|
|
// Get the empty stub we generated earlier.
|
|
JITEmitter *JE = static_cast<JITEmitter*>(getCodeEmitter());
|
|
void *Stub = JE->getJITResolver().getLazyFunctionStub(F);
|
|
void *Addr = getPointerToGlobalIfAvailable(F);
|
|
assert(Addr != Stub && "Function must have non-stub address to be updated.");
|
|
|
|
// Tell the target jit info to rewrite the stub at the specified address,
|
|
// rather than creating a new one.
|
|
TargetJITInfo::StubLayout layout = getJITInfo().getStubLayout();
|
|
JE->startGVStub(Stub, layout.Size);
|
|
getJITInfo().emitFunctionStub(F, Addr, *getCodeEmitter());
|
|
JE->finishGVStub();
|
|
}
|
|
|
|
/// freeMachineCodeForFunction - release machine code memory for given Function.
|
|
///
|
|
void JIT::freeMachineCodeForFunction(Function *F) {
|
|
// Delete translation for this from the ExecutionEngine, so it will get
|
|
// retranslated next time it is used.
|
|
updateGlobalMapping(F, 0);
|
|
|
|
// Free the actual memory for the function body and related stuff.
|
|
static_cast<JITEmitter*>(JCE)->deallocateMemForFunction(F);
|
|
}
|