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author | Chris Lattner <sabre@nondot.org> | 2002-12-24 00:01:05 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2002-12-24 00:01:05 +0000 |
commit | bd199fb1148b9e16c4e6f3d0ee386c2505a55b71 (patch) | |
tree | 226f64cc95160ebd8da8d2ec4cfaf2babf7c3879 /lib/ExecutionEngine/JIT | |
parent | fe11a97fcde7c63109c3ad36570657807d0cd6ef (diff) | |
download | llvm-bd199fb1148b9e16c4e6f3d0ee386c2505a55b71.tar.gz llvm-bd199fb1148b9e16c4e6f3d0ee386c2505a55b71.tar.bz2 llvm-bd199fb1148b9e16c4e6f3d0ee386c2505a55b71.tar.xz |
Initial checkin of new LLI with JIT compiler
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5126 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/ExecutionEngine/JIT')
-rw-r--r-- | lib/ExecutionEngine/JIT/Callback.cpp | 62 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/GlobalVars.cpp | 0 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/JIT.cpp | 53 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/JITEmitter.cpp | 107 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/Makefile | 4 | ||||
-rw-r--r-- | lib/ExecutionEngine/JIT/VM.cpp | 84 |
6 files changed, 310 insertions, 0 deletions
diff --git a/lib/ExecutionEngine/JIT/Callback.cpp b/lib/ExecutionEngine/JIT/Callback.cpp new file mode 100644 index 0000000000..b843e10689 --- /dev/null +++ b/lib/ExecutionEngine/JIT/Callback.cpp @@ -0,0 +1,62 @@ +//===-- Callback.cpp - Trap handler for function resolution ---------------===// +// +// This file defines the SIGSEGV handler which is invoked when a reference to a +// non-codegen'd function is found. +// +//===----------------------------------------------------------------------===// + +#include "VM.h" +#include "Support/Statistic.h" +#include <signal.h> +#include <ucontext.h> +#include <iostream> + +static VM *TheVM = 0; + +static void TrapHandler(int TN, siginfo_t *SI, ucontext_t *ucp) { + assert(TN == SIGSEGV && "Should be SIGSEGV!"); + +#ifdef REG_EIP /* this code does not compile on Sparc! */ + if (SI->si_code != SEGV_MAPERR || SI->si_addr != 0 || + ucp->uc_mcontext.gregs[REG_EIP] != 0) { + std::cerr << "Bad SEGV encountered!\n"; + abort(); + } + + // The call instruction should have pushed the return value onto the stack... + unsigned RefAddr = *(unsigned*)ucp->uc_mcontext.gregs[REG_ESP]; + RefAddr -= 4; // Backtrack to the reference itself... + + DEBUG(std::cerr << "In SEGV handler! Addr=0x" << std::hex << RefAddr + << " ESP=0x" << ucp->uc_mcontext.gregs[REG_ESP] << std::dec + << ": Resolving call to function: " + << TheVM->getFunctionReferencedName((void*)RefAddr) << "\n"); + + // Sanity check to make sure this really is a call instruction... + assert(((unsigned char*)RefAddr)[-1] == 0xE8 && "Not a call instr!"); + + unsigned NewVal = (unsigned)TheVM->resolveFunctionReference((void*)RefAddr); + + // Rewrite the call target... so that we don't fault every time we execute + // the call. + *(unsigned*)RefAddr = NewVal-RefAddr-4; + + // Change the instruction pointer to be the real target of the call... + ucp->uc_mcontext.gregs[REG_EIP] = NewVal; + +#endif +} + + +void VM::registerCallback() { + TheVM = this; + + // Register the signal handler... + struct sigaction SA; + SA.sa_sigaction = (void (*)(int, siginfo_t*, void*))TrapHandler; + sigfillset(&SA.sa_mask); // Block all signals while codegen'ing + SA.sa_flags = SA_NOCLDSTOP|SA_SIGINFO; // Get siginfo + sigaction(SIGSEGV, &SA, 0); // Install the handler +} + + diff --git a/lib/ExecutionEngine/JIT/GlobalVars.cpp b/lib/ExecutionEngine/JIT/GlobalVars.cpp new file mode 100644 index 0000000000..e69de29bb2 --- /dev/null +++ b/lib/ExecutionEngine/JIT/GlobalVars.cpp diff --git a/lib/ExecutionEngine/JIT/JIT.cpp b/lib/ExecutionEngine/JIT/JIT.cpp new file mode 100644 index 0000000000..b2b56a63e5 --- /dev/null +++ b/lib/ExecutionEngine/JIT/JIT.cpp @@ -0,0 +1,53 @@ +//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===// +// +// This file implements the top-level support for creating a Just-In-Time +// compiler for the current architecture. +// +//===----------------------------------------------------------------------===// + +#include "VM.h" +#include "llvm/Target/TargetMachine.h" +#include "llvm/Target/TargetMachineImpls.h" +#include "llvm/Module.h" + + +/// createJIT - Create an return a new JIT compiler if there is one available +/// for the current target. Otherwise it returns null. +/// +ExecutionEngine *ExecutionEngine::createJIT(Module *M, unsigned Config) { + // FIXME: This should be controlled by which subdirectory gets linked in! +#if !defined(i386) && !defined(__i386__) && !defined(__x86__) + return 0; +#endif + // Allocate a target... in the future this will be controllable on the + // command line. + TargetMachine *Target = allocateX86TargetMachine(Config); + assert(Target && "Could not allocate X86 target machine!"); + + // Create the virtual machine object... + return new VM(M, Target); +} + +VM::VM(Module *M, TargetMachine *tm) : ExecutionEngine(M), TM(*tm) { + setTargetData(TM.getTargetData()); + MCE = createEmitter(*this); // Initialize MCE + setupPassManager(); + registerCallback(); +} + +int VM::run(const std::string &FnName, const std::vector<std::string> &Args) { + Function *F = getModule().getNamedFunction(FnName); + if (F == 0) { + std::cerr << "Could not find function '" << FnName <<"' in module!\n"; + return 1; + } + + int(*PF)(int, char**) = (int(*)(int, char**))getPointerToFunction(F); + assert(PF != 0 && "Null pointer to function?"); + + // Build an argv vector... + char **Argv = (char**)CreateArgv(Args); + + // Call the main function... + return PF(Args.size(), Argv); +} diff --git a/lib/ExecutionEngine/JIT/JITEmitter.cpp b/lib/ExecutionEngine/JIT/JITEmitter.cpp new file mode 100644 index 0000000000..253a229a38 --- /dev/null +++ b/lib/ExecutionEngine/JIT/JITEmitter.cpp @@ -0,0 +1,107 @@ +//===-- Emitter.cpp - Write machine code to executable memory -------------===// +// +// This file defines a MachineCodeEmitter object that is used by Jello to write +// machine code to memory and remember where relocatable values lie. +// +//===----------------------------------------------------------------------===// + +#include "VM.h" +#include "llvm/CodeGen/MachineCodeEmitter.h" +#include "llvm/CodeGen/MachineFunction.h" +#include "llvm/Function.h" +#include "Support/Statistic.h" + +namespace { + Statistic<> NumBytes("jello", "Number of bytes of machine code compiled"); + + class Emitter : public MachineCodeEmitter { + VM &TheVM; + + unsigned char *CurBlock; + unsigned char *CurByte; + + std::vector<std::pair<BasicBlock*, unsigned *> > BBRefs; + std::map<BasicBlock*, unsigned> BBLocations; + public: + Emitter(VM &vm) : TheVM(vm) {} + + virtual void startFunction(MachineFunction &F); + virtual void finishFunction(MachineFunction &F); + virtual void startBasicBlock(MachineBasicBlock &BB); + virtual void emitByte(unsigned char B); + virtual void emitPCRelativeDisp(Value *V); + virtual void emitGlobalAddress(GlobalValue *V); + }; +} + +MachineCodeEmitter *VM::createEmitter(VM &V) { + return new Emitter(V); +} + + +#define _POSIX_MAPPED_FILES +#include <unistd.h> +#include <sys/mman.h> + +static void *getMemory() { + return mmap(0, 4096*2, PROT_READ|PROT_WRITE|PROT_EXEC, + MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); +} + + +void Emitter::startFunction(MachineFunction &F) { + CurBlock = (unsigned char *)getMemory(); + CurByte = CurBlock; // Start writing at the beginning of the fn. + TheVM.addGlobalMapping(F.getFunction(), CurBlock); +} + +void Emitter::finishFunction(MachineFunction &F) { + for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) { + unsigned Location = BBLocations[BBRefs[i].first]; + unsigned *Ref = BBRefs[i].second; + *Ref = Location-(unsigned)Ref-4; + } + BBRefs.clear(); + BBLocations.clear(); + + NumBytes += CurByte-CurBlock; + + DEBUG(std::cerr << "Finished CodeGen of [" << std::hex << (unsigned)CurBlock + << std::dec << "] Function: " << F.getFunction()->getName() + << ": " << CurByte-CurBlock << " bytes of text\n"); +} + +void Emitter::startBasicBlock(MachineBasicBlock &BB) { + BBLocations[BB.getBasicBlock()] = (unsigned)CurByte; +} + + +void Emitter::emitByte(unsigned char B) { + *CurByte++ = B; // Write the byte to memory +} + + +// emitPCRelativeDisp - For functions, just output a displacement that will +// cause a reference to the zero page, which will cause a seg-fault, causing +// things to get resolved on demand. Keep track of these markers. +// +// For basic block references, keep track of where the references are so they +// may be patched up when the basic block is defined. +// +void Emitter::emitPCRelativeDisp(Value *V) { + if (Function *F = dyn_cast<Function>(V)) { + TheVM.addFunctionRef(CurByte, F); + unsigned ZeroAddr = -(unsigned)CurByte-4; // Calculate displacement to null + *(unsigned*)CurByte = ZeroAddr; // 4 byte offset + CurByte += 4; + } else { + BasicBlock *BB = cast<BasicBlock>(V); // Keep track of reference... + BBRefs.push_back(std::make_pair(BB, (unsigned*)CurByte)); + CurByte += 4; + } +} + +void Emitter::emitGlobalAddress(GlobalValue *V) { + *(void**)CurByte = TheVM.getPointerToGlobal(V); + CurByte += 4; +} diff --git a/lib/ExecutionEngine/JIT/Makefile b/lib/ExecutionEngine/JIT/Makefile new file mode 100644 index 0000000000..bc3f709a99 --- /dev/null +++ b/lib/ExecutionEngine/JIT/Makefile @@ -0,0 +1,4 @@ +LEVEL = ../../.. +LIBRARYNAME = lli-jit + +include $(LEVEL)/Makefile.common diff --git a/lib/ExecutionEngine/JIT/VM.cpp b/lib/ExecutionEngine/JIT/VM.cpp new file mode 100644 index 0000000000..f66d4d7b7e --- /dev/null +++ b/lib/ExecutionEngine/JIT/VM.cpp @@ -0,0 +1,84 @@ +//===-- jello.cpp - LLVM Just in Time Compiler ----------------------------===// +// +// This tool implements a just-in-time compiler for LLVM, allowing direct +// execution of LLVM bytecode in an efficient manner. +// +//===----------------------------------------------------------------------===// + +#include "VM.h" +#include "llvm/Target/TargetMachine.h" +#include "llvm/CodeGen/MachineCodeEmitter.h" +#include "llvm/Function.h" +#include <dlfcn.h> // dlsym access + + +VM::~VM() { + delete MCE; + delete &TM; +} + +/// setupPassManager - Initialize the VM PassManager object with all of the +/// passes needed for the target to generate code. +/// +void VM::setupPassManager() { + // Compile LLVM Code down to machine code in the intermediate representation + if (TM.addPassesToJITCompile(PM)) { + std::cerr << "lli: target '" << TM.getName() + << "' doesn't support JIT compilation!\n"; + abort(); + } + + // Turn the machine code intermediate representation into bytes in memory that + // may be executed. + // + if (TM.addPassesToEmitMachineCode(PM, *MCE)) { + std::cerr << "lli: target '" << TM.getName() + << "' doesn't support machine code emission!\n"; + abort(); + } +} + +void *VM::resolveFunctionReference(void *RefAddr) { + Function *F = FunctionRefs[RefAddr]; + assert(F && "Reference address not known!"); + + void *Addr = getPointerToFunction(F); + assert(Addr && "Pointer to function unknown!"); + + FunctionRefs.erase(RefAddr); + return Addr; +} + +const std::string &VM::getFunctionReferencedName(void *RefAddr) { + return FunctionRefs[RefAddr]->getName(); +} + +static void NoopFn() {} + +/// getPointerToFunction - This method is used to get the address of the +/// specified function, compiling it if neccesary. +/// +void *VM::getPointerToFunction(const Function *F) { + void *&Addr = GlobalAddress[F]; // Function already code gen'd + if (Addr) return Addr; + + if (F->isExternal()) { + // If it's an external function, look it up in the process image... + void *Ptr = dlsym(0, F->getName().c_str()); + if (Ptr == 0) { + std::cerr << "WARNING: Cannot resolve fn '" << F->getName() + << "' using a dummy noop function instead!\n"; + Ptr = (void*)NoopFn; + } + + return Addr = Ptr; + } + + // JIT all of the functions in the module. Eventually this will JIT functions + // on demand. This has the effect of populating all of the non-external + // functions into the GlobalAddress table. + PM.run(getModule()); + + assert(Addr && "Code generation didn't add function to GlobalAddress table!"); + return Addr; +} |