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Make it possible to create multiple JIT instances at the same time, by removing
the global TheJIT and TheJITResolver variables. Lazy compilation is supported by a global map from a stub address to the JITResolver that knows how to compile it. Patch by Olivier Meurant! llvm-svn: 95837
This commit is contained in:
Jeffrey Yasskin
parent
3b5abdefc3
commit
8a1ee8f852
@ -467,6 +467,10 @@ href="http://llvm.org/viewvc/llvm-project?view=rev&revision=85295">defaults
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to compiling eagerly</a> to avoid a race condition in the lazy JIT.
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Clients that still want the lazy JIT can switch it on by calling
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<tt>ExecutionEngine::DisableLazyCompilation(false)</tt>.</li>
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<li>It is now possible to create more than one JIT instance in the same process.
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These JITs can generate machine code in parallel,
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although <a href="http://llvm.org/docs/ProgrammersManual.html#jitthreading">you
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still have to obey the other threading restrictions</a>.</li>
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</ul>
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</div>
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@ -18,6 +18,7 @@
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Instructions.h"
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#include "llvm/ADT/SmallPtrSet.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/ExecutionEngine/GenericValue.h"
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@ -27,6 +28,7 @@
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#include "llvm/Target/TargetJITInfo.h"
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#include "llvm/Support/Dwarf.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/System/DynamicLibrary.h"
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#include "llvm/Config/config.h"
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@ -237,9 +239,53 @@ ExecutionEngine *JIT::createJIT(Module *M,
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}
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}
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namespace {
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/// This class supports the global getPointerToNamedFunction(), which allows
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/// bugpoint or gdb users to search for a function by name without any context.
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class JitPool {
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SmallPtrSet<JIT*, 1> JITs; // Optimize for process containing just 1 JIT.
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mutable sys::Mutex Lock;
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public:
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void Add(JIT *jit) {
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MutexGuard guard(Lock);
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JITs.insert(jit);
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}
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void Remove(JIT *jit) {
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MutexGuard guard(Lock);
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JITs.erase(jit);
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}
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void *getPointerToNamedFunction(const char *Name) const {
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MutexGuard guard(Lock);
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assert(JITs.size() != 0 && "No Jit registered");
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//search function in every instance of JIT
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for (SmallPtrSet<JIT*, 1>::const_iterator Jit = JITs.begin(),
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end = JITs.end();
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Jit != end; ++Jit) {
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if (Function *F = (*Jit)->FindFunctionNamed(Name))
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return (*Jit)->getPointerToFunction(F);
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}
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// The function is not available : fallback on the first created (will
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// search in symbol of the current program/library)
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return (*JITs.begin())->getPointerToNamedFunction(Name);
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}
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};
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ManagedStatic<JitPool> AllJits;
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}
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extern "C" {
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// getPointerToNamedFunction - This function is used as a global wrapper to
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// JIT::getPointerToNamedFunction for the purpose of resolving symbols when
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// bugpoint is debugging the JIT. In that scenario, we are loading an .so and
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// need to resolve function(s) that are being mis-codegenerated, so we need to
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// resolve their addresses at runtime, and this is the way to do it.
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void *getPointerToNamedFunction(const char *Name) {
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return AllJits->getPointerToNamedFunction(Name);
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}
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}
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JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
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JITMemoryManager *JMM, CodeGenOpt::Level OptLevel, bool GVsWithCode)
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: ExecutionEngine(M), TM(tm), TJI(tji), AllocateGVsWithCode(GVsWithCode) {
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: ExecutionEngine(M), TM(tm), TJI(tji), AllocateGVsWithCode(GVsWithCode),
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isAlreadyCodeGenerating(false) {
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setTargetData(TM.getTargetData());
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jitstate = new JITState(M);
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@ -247,6 +293,9 @@ JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
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// Initialize JCE
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JCE = createEmitter(*this, JMM, TM);
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// Register in global list of all JITs.
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AllJits->Add(this);
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// Add target data
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MutexGuard locked(lock);
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FunctionPassManager &PM = jitstate->getPM(locked);
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@ -281,6 +330,7 @@ JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
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}
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JIT::~JIT() {
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AllJits->Remove(this);
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delete jitstate;
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delete JCE;
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delete &TM;
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@ -570,7 +620,6 @@ void JIT::runJITOnFunction(Function *F, MachineCodeInfo *MCI) {
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}
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void JIT::runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked) {
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static bool isAlreadyCodeGenerating = false;
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assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!");
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// JIT the function
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@ -61,6 +61,10 @@ class JIT : public ExecutionEngine {
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/// should be set to true. Doing so breaks freeMachineCodeForFunction.
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bool AllocateGVsWithCode;
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/// True while the JIT is generating code. Used to assert against recursive
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/// entry.
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bool isAlreadyCodeGenerating;
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JITState *jitstate;
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JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
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@ -37,6 +37,7 @@
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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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@ -57,7 +58,6 @@ 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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static JIT *TheJIT = 0;
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// A declaration may stop being a declaration once it's fully read from bitcode.
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@ -109,9 +109,13 @@ namespace {
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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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JIT *TheJIT;
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public:
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JITResolverState() : FunctionToLazyStubMap(this),
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FunctionToCallSitesMap(this) {}
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JITResolverState(JIT *jit) : FunctionToLazyStubMap(this),
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FunctionToCallSitesMap(this),
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TheJIT(jit) {}
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FunctionToLazyStubMapTy& getFunctionToLazyStubMap(
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const MutexGuard& locked) {
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@ -227,18 +231,13 @@ namespace {
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JITEmitter &JE;
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static JITResolver *TheJITResolver;
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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) : nextGOTIndex(0), JE(je) {
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TheJIT = &jit;
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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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assert(TheJITResolver == 0 && "Multiple JIT resolvers?");
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TheJITResolver = this;
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}
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~JITResolver() {
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TheJITResolver = 0;
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}
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/// getLazyFunctionStubIfAvailable - This returns a pointer to a function's
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@ -273,6 +272,44 @@ namespace {
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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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};
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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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@ -371,10 +408,13 @@ namespace {
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DILocation PrevDLT;
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/// Instance of the JIT
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JIT *TheJIT;
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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), PrevDLT(NULL) {
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EmittedFunctions(this), PrevDLT(NULL), 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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@ -495,8 +535,6 @@ namespace {
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};
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}
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JITResolver *JITResolver::TheJITResolver = 0;
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void CallSiteValueMapConfig::onDelete(JITResolverState *JRS, Function *F) {
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JRS->EraseAllCallSitesPrelocked(F);
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}
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@ -551,6 +589,10 @@ void *JITResolver::getLazyFunctionStub(Function *F) {
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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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// 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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@ -637,6 +679,9 @@ void JITResolver::getRelocatableGVs(SmallVectorImpl<GlobalValue*> &GVs,
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GlobalValue *JITResolver::invalidateStub(void *Stub) {
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MutexGuard locked(TheJIT->lock);
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// Remove the stub from the StubToResolverMap.
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StubToResolverMap->UnregisterStubResolver(Stub);
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GlobalToIndirectSymMapTy &GM = state.getGlobalToIndirectSymMap(locked);
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// Look up the cheap way first, to see if it's a function stub we are
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@ -671,7 +716,8 @@ GlobalValue *JITResolver::invalidateStub(void *Stub) {
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/// 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 = *TheJITResolver;
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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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Function* F = 0;
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void* ActualPtr = 0;
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@ -680,24 +726,24 @@ void *JITResolver::JITCompilerFn(void *Stub) {
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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(TheJIT->lock);
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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.
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pair<void*, Function*> I =
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JR.state.LookupFunctionFromCallSite(locked, Stub);
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JR->state.LookupFunctionFromCallSite(locked, Stub);
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F = I.second;
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ActualPtr = I.first;
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}
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// If we have already code generated the function, just return the address.
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void *Result = TheJIT->getPointerToGlobalIfAvailable(F);
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void *Result = JR->TheJIT->getPointerToGlobalIfAvailable(F);
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if (!Result) {
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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 (!TheJIT->isCompilingLazily()) {
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if (!JR->TheJIT->isCompilingLazily()) {
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llvm_report_error("LLVM JIT requested to do lazy compilation of function '"
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+ F->getName() + "' when lazy compiles are disabled!");
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}
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@ -706,11 +752,11 @@ void *JITResolver::JITCompilerFn(void *Stub) {
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<< "' In stub ptr = " << Stub << " actual ptr = "
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<< ActualPtr << "\n");
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Result = TheJIT->getPointerToFunction(F);
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Result = JR->TheJIT->getPointerToFunction(F);
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}
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// Reacquire the lock to update the GOT map.
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MutexGuard locked(TheJIT->lock);
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MutexGuard locked(JR->TheJIT->lock);
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// We might like to remove the call site from the CallSiteToFunction map, but
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// we can't do that! Multiple threads could be stuck, waiting to acquire the
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@ -725,8 +771,8 @@ void *JITResolver::JITCompilerFn(void *Stub) {
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// if they see it still using the stub address.
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// Note: this is done so the Resolver doesn't have to manage GOT memory
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// Do this without allocating map space if the target isn't using a GOT
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if(JR.revGOTMap.find(Stub) != JR.revGOTMap.end())
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JR.revGOTMap[Result] = JR.revGOTMap[Stub];
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if(JR->revGOTMap.find(Stub) != JR->revGOTMap.end())
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JR->revGOTMap[Result] = JR->revGOTMap[Stub];
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return Result;
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}
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@ -839,7 +885,7 @@ static unsigned GetConstantPoolSizeInBytes(MachineConstantPool *MCP,
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return Size;
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}
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static unsigned GetJumpTableSizeInBytes(MachineJumpTableInfo *MJTI) {
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static unsigned GetJumpTableSizeInBytes(MachineJumpTableInfo *MJTI, JIT *jit) {
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const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
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if (JT.empty()) return 0;
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@ -847,7 +893,7 @@ static unsigned GetJumpTableSizeInBytes(MachineJumpTableInfo *MJTI) {
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for (unsigned i = 0, e = JT.size(); i != e; ++i)
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NumEntries += JT[i].MBBs.size();
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return NumEntries * MJTI->getEntrySize(*TheJIT->getTargetData());
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return NumEntries * MJTI->getEntrySize(*jit->getTargetData());
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}
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static uintptr_t RoundUpToAlign(uintptr_t Size, unsigned Alignment) {
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@ -1032,7 +1078,7 @@ void JITEmitter::startFunction(MachineFunction &F) {
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MJTI->getEntryAlignment(*TheJIT->getTargetData()));
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// Add the jump table size
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ActualSize += GetJumpTableSizeInBytes(MJTI);
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ActualSize += GetJumpTableSizeInBytes(MJTI, TheJIT);
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}
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// Add the alignment for the function
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@ -1552,19 +1598,6 @@ JITCodeEmitter *JIT::createEmitter(JIT &jit, JITMemoryManager *JMM,
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return new JITEmitter(jit, JMM, tm);
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}
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// getPointerToNamedFunction - This function is used as a global wrapper to
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// JIT::getPointerToNamedFunction for the purpose of resolving symbols when
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// bugpoint is debugging the JIT. In that scenario, we are loading an .so and
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// need to resolve function(s) that are being mis-codegenerated, so we need to
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// resolve their addresses at runtime, and this is the way to do it.
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extern "C" {
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void *getPointerToNamedFunction(const char *Name) {
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if (Function *F = TheJIT->FindFunctionNamed(Name))
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return TheJIT->getPointerToFunction(F);
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return TheJIT->getPointerToNamedFunction(Name);
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}
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}
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// getPointerToFunctionOrStub - If the specified function has been
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// code-gen'd, return a pointer to the function. If not, compile it, or use
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// a stub to implement lazy compilation if available.
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164
unittests/ExecutionEngine/JIT/MultiJITTest.cpp
Normal file
164
unittests/ExecutionEngine/JIT/MultiJITTest.cpp
Normal file
@ -0,0 +1,164 @@
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//===- MultiJITTest.cpp - Unit tests for instantiating multiple JITs ------===//
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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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#include "gtest/gtest.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/Assembly/Parser.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/ExecutionEngine/JIT.h"
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#include "llvm/Support/SourceMgr.h"
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#include <vector>
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using namespace llvm;
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namespace {
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bool LoadAssemblyInto(Module *M, const char *assembly) {
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SMDiagnostic Error;
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bool success =
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NULL != ParseAssemblyString(assembly, M, Error, M->getContext());
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std::string errMsg;
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raw_string_ostream os(errMsg);
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Error.Print("", os);
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EXPECT_TRUE(success) << os.str();
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return success;
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}
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|
||||
void createModule1(LLVMContext &Context1, Module *&M1, Function *&FooF1) {
|
||||
M1 = new Module("test1", Context1);
|
||||
LoadAssemblyInto(M1,
|
||||
"define i32 @add1(i32 %ArgX1) { "
|
||||
"entry: "
|
||||
" %addresult = add i32 1, %ArgX1 "
|
||||
" ret i32 %addresult "
|
||||
"} "
|
||||
" "
|
||||
"define i32 @foo1() { "
|
||||
"entry: "
|
||||
" %add1 = call i32 @add1(i32 10) "
|
||||
" ret i32 %add1 "
|
||||
"} ");
|
||||
FooF1 = M1->getFunction("foo1");
|
||||
}
|
||||
|
||||
void createModule2(LLVMContext &Context2, Module *&M2, Function *&FooF2) {
|
||||
M2 = new Module("test2", Context2);
|
||||
LoadAssemblyInto(M2,
|
||||
"define i32 @add2(i32 %ArgX2) { "
|
||||
"entry: "
|
||||
" %addresult = add i32 2, %ArgX2 "
|
||||
" ret i32 %addresult "
|
||||
"} "
|
||||
" "
|
||||
"define i32 @foo2() { "
|
||||
"entry: "
|
||||
" %add2 = call i32 @add2(i32 10) "
|
||||
" ret i32 %add2 "
|
||||
"} ");
|
||||
FooF2 = M2->getFunction("foo2");
|
||||
}
|
||||
|
||||
TEST(MultiJitTest, EagerMode) {
|
||||
LLVMContext Context1;
|
||||
Module *M1 = 0;
|
||||
Function *FooF1 = 0;
|
||||
createModule1(Context1, M1, FooF1);
|
||||
|
||||
LLVMContext Context2;
|
||||
Module *M2 = 0;
|
||||
Function *FooF2 = 0;
|
||||
createModule2(Context2, M2, FooF2);
|
||||
|
||||
// Now we create the JIT in eager mode
|
||||
OwningPtr<ExecutionEngine> EE1(EngineBuilder(M1).create());
|
||||
EE1->DisableLazyCompilation(true);
|
||||
OwningPtr<ExecutionEngine> EE2(EngineBuilder(M2).create());
|
||||
EE2->DisableLazyCompilation(true);
|
||||
|
||||
// Call the `foo' function with no arguments:
|
||||
std::vector<GenericValue> noargs;
|
||||
GenericValue gv1 = EE1->runFunction(FooF1, noargs);
|
||||
GenericValue gv2 = EE2->runFunction(FooF2, noargs);
|
||||
|
||||
// Import result of execution:
|
||||
EXPECT_EQ(gv1.IntVal, 11);
|
||||
EXPECT_EQ(gv2.IntVal, 12);
|
||||
|
||||
EE1->freeMachineCodeForFunction(FooF1);
|
||||
EE2->freeMachineCodeForFunction(FooF2);
|
||||
}
|
||||
|
||||
TEST(MultiJitTest, LazyMode) {
|
||||
LLVMContext Context1;
|
||||
Module *M1 = 0;
|
||||
Function *FooF1 = 0;
|
||||
createModule1(Context1, M1, FooF1);
|
||||
|
||||
LLVMContext Context2;
|
||||
Module *M2 = 0;
|
||||
Function *FooF2 = 0;
|
||||
createModule2(Context2, M2, FooF2);
|
||||
|
||||
// Now we create the JIT in lazy mode
|
||||
OwningPtr<ExecutionEngine> EE1(EngineBuilder(M1).create());
|
||||
EE1->DisableLazyCompilation(false);
|
||||
OwningPtr<ExecutionEngine> EE2(EngineBuilder(M2).create());
|
||||
EE2->DisableLazyCompilation(false);
|
||||
|
||||
// Call the `foo' function with no arguments:
|
||||
std::vector<GenericValue> noargs;
|
||||
GenericValue gv1 = EE1->runFunction(FooF1, noargs);
|
||||
GenericValue gv2 = EE2->runFunction(FooF2, noargs);
|
||||
|
||||
// Import result of execution:
|
||||
EXPECT_EQ(gv1.IntVal, 11);
|
||||
EXPECT_EQ(gv2.IntVal, 12);
|
||||
|
||||
EE1->freeMachineCodeForFunction(FooF1);
|
||||
EE2->freeMachineCodeForFunction(FooF2);
|
||||
}
|
||||
|
||||
extern "C" {
|
||||
extern void *getPointerToNamedFunction(const char *Name);
|
||||
}
|
||||
|
||||
TEST(MultiJitTest, JitPool) {
|
||||
LLVMContext Context1;
|
||||
Module *M1 = 0;
|
||||
Function *FooF1 = 0;
|
||||
createModule1(Context1, M1, FooF1);
|
||||
|
||||
LLVMContext Context2;
|
||||
Module *M2 = 0;
|
||||
Function *FooF2 = 0;
|
||||
createModule2(Context2, M2, FooF2);
|
||||
|
||||
// Now we create two JITs
|
||||
OwningPtr<ExecutionEngine> EE1(EngineBuilder(M1).create());
|
||||
OwningPtr<ExecutionEngine> EE2(EngineBuilder(M2).create());
|
||||
|
||||
Function *F1 = EE1->FindFunctionNamed("foo1");
|
||||
void *foo1 = EE1->getPointerToFunction(F1);
|
||||
|
||||
Function *F2 = EE2->FindFunctionNamed("foo2");
|
||||
void *foo2 = EE2->getPointerToFunction(F2);
|
||||
|
||||
// Function in M1
|
||||
EXPECT_EQ(getPointerToNamedFunction("foo1"), foo1);
|
||||
|
||||
// Function in M2
|
||||
EXPECT_EQ(getPointerToNamedFunction("foo2"), foo2);
|
||||
|
||||
// Symbol search
|
||||
EXPECT_EQ((intptr_t)getPointerToNamedFunction("getPointerToNamedFunction"),
|
||||
(intptr_t)&getPointerToNamedFunction);
|
||||
}
|
||||
|
||||
} // anonymous namespace
|
||||
Loading…
Reference in New Issue
Block a user