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//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This tool implements a just-in-time compiler for LLVM, allowing direct
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// execution of LLVM bitcode in an efficient manner.
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//===----------------------------------------------------------------------===//
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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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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#include "llvm/ExecutionEngine/JITEventListener.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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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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// Apple gcc defaults to -fuse-cxa-atexit (i.e. calls __cxa_atexit instead
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// of atexit). It passes the address of linker generated symbol __dso_handle
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// This configuration change happened at version 5330.
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# include <AvailabilityMacros.h>
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# if defined(MAC_OS_X_VERSION_10_4) && \
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((MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_4) || \
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(MAC_OS_X_VERSION_MIN_REQUIRED == MAC_OS_X_VERSION_10_4 && \
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__APPLE_CC__ >= 5330))
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# ifndef HAVE___DSO_HANDLE
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# define HAVE___DSO_HANDLE 1
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extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
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static struct RegisterJIT {
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RegisterJIT() { JIT::Register(); }
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extern "C" void LLVMLinkInJIT() {
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#if defined(__GNUC__) && !defined(__ARM_EABI__) && !defined(__USING_SJLJ_EXCEPTIONS__)
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// libgcc defines the __register_frame function to dynamically register new
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// dwarf frames for exception handling. This functionality is not portable
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// across compilers and is only provided by GCC. We use the __register_frame
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// function here so that code generated by the JIT cooperates with the unwinding
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// runtime of libgcc. When JITting with exception handling enable, LLVM
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// generates dwarf frames and registers it to libgcc with __register_frame.
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// The __register_frame function works with Linux.
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// Unfortunately, this functionality seems to be in libgcc after the unwinding
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// library of libgcc for darwin was written. The code for darwin overwrites the
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// value updated by __register_frame with a value fetched with "keymgr".
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// "keymgr" is an obsolete functionality, which should be rewritten some day.
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// In the meantime, since "keymgr" is on all libgccs shipped with apple-gcc, we
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// need a workaround in LLVM which uses the "keymgr" to dynamically modify the
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// values of an opaque key, used by libgcc to find dwarf tables.
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extern "C" void __register_frame(void*);
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#if defined(__APPLE__) && MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
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// LibgccObject - This is the structure defined in libgcc. There is no #include
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// provided for this structure, so we also define it here. libgcc calls it
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// "struct object". The structure is undocumented in libgcc.
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struct LibgccObject {
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/// frame - Pointer to the exception table.
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/// encoding - The encoding of the object?
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unsigned long sorted : 1;
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unsigned long from_array : 1;
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unsigned long mixed_encoding : 1;
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unsigned long encoding : 8;
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unsigned long count : 21;
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/// fde_end - libgcc defines this field only if some macro is defined. We
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/// include this field even if it may not there, to make libgcc happy.
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/// next - At least we know it's a chained list!
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struct LibgccObject *next;
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// "kemgr" stuff. Apparently, all frame tables are stored there.
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extern "C" void _keymgr_set_and_unlock_processwide_ptr(int, void *);
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extern "C" void *_keymgr_get_and_lock_processwide_ptr(int);
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#define KEYMGR_GCC3_DW2_OBJ_LIST 302 /* Dwarf2 object list */
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/// LibgccObjectInfo - libgcc defines this struct as km_object_info. It
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/// probably contains all dwarf tables that are loaded.
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struct LibgccObjectInfo {
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/// seenObjects - LibgccObjects already parsed by the unwinding runtime.
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struct LibgccObject* seenObjects;
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/// unseenObjects - LibgccObjects not parsed yet by the unwinding runtime.
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struct LibgccObject* unseenObjects;
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/// darwin_register_frame - Since __register_frame does not work with darwin's
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/// libgcc,we provide our own function, which "tricks" libgcc by modifying the
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/// "Dwarf2 object list" key.
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void DarwinRegisterFrame(void* FrameBegin) {
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LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
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_keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
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assert(LOI && "This should be preallocated by the runtime");
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// Allocate a new LibgccObject to represent this frame. Deallocation of this
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// object may be impossible: since darwin code in libgcc was written after
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// the ability to dynamically register frames, things may crash if we
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struct LibgccObject* ob = (struct LibgccObject*)
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malloc(sizeof(struct LibgccObject));
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// Do like libgcc for the values of the field.
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ob->unused1 = (void *)-1;
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ob->frame = FrameBegin;
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ob->encoding.b.encoding = llvm::dwarf::DW_EH_PE_omit;
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// Put the info on both places, as libgcc uses the first or the second
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// field. Note that we rely on having two pointers here. If fde_end was a
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// char, things would get complicated.
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ob->fde_end = (char*)LOI->unseenObjects;
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ob->next = LOI->unseenObjects;
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// Update the key's unseenObjects list.
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LOI->unseenObjects = ob;
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// Finally update the "key". Apparently, libgcc requires it.
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_keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST,
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/// createJIT - This is the factory method for creating a JIT for the current
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/// machine, it does not fall back to the interpreter. This takes ownership
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ExecutionEngine *ExecutionEngine::createJIT(Module *M,
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std::string *ErrorStr,
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JITMemoryManager *JMM,
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CodeGenOpt::Level OptLevel,
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CodeModel::Model CMM) {
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// Use the defaults for extra parameters. Users can use EngineBuilder to
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StringRef MArch = "";
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SmallVector<std::string, 1> MAttrs;
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return JIT::createJIT(M, ErrorStr, JMM, OptLevel, GVsWithCode, CMM,
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MArch, MCPU, MAttrs);
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ExecutionEngine *JIT::createJIT(Module *M,
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std::string *ErrorStr,
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JITMemoryManager *JMM,
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CodeGenOpt::Level OptLevel,
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CodeModel::Model CMM,
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const SmallVectorImpl<std::string>& MAttrs) {
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// Try to register the program as a source of symbols to resolve against.
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sys::DynamicLibrary::LoadLibraryPermanently(0, NULL);
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/* CLAMAV LOCAL: no dlopen */
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// if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
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// Pick a target either via -march or by guessing the native arch.
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TargetMachine *TM = JIT::selectTarget(M, MArch, MCPU, MAttrs, ErrorStr);
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if (!TM || (ErrorStr && ErrorStr->length() > 0)) return 0;
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TM->setCodeModel(CMM);
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// If the target supports JIT code generation, create a the JIT.
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if (TargetJITInfo *TJ = TM->getJITInfo()) {
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return new JIT(M, *TM, *TJ, JMM, OptLevel, GVsWithCode);
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*ErrorStr = "target does not support JIT code generation";
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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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SmallPtrSet<JIT*, 1> JITs; // Optimize for process containing just 1 JIT.
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mutable sys::Mutex Lock;
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MutexGuard guard(Lock);
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void Remove(JIT *jit) {
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MutexGuard guard(Lock);
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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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if (Function *F = (*Jit)->FindFunctionNamed(Name))
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return (*Jit)->getPointerToFunction(F);
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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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ManagedStatic<JitPool> AllJits;
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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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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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isAlreadyCodeGenerating(false) {
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setTargetData(TM.getTargetData());
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jitstate = new JITState(M);
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JCE = createEmitter(*this, JMM, TM);
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// Register in global list of all JITs.
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MutexGuard locked(lock);
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FunctionPassManager &PM = jitstate->getPM(locked);
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PM.add(new TargetData(*TM.getTargetData()));
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// Turn the machine code intermediate representation into bytes in memory that
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if (TM.addPassesToEmitMachineCode(PM, *JCE, OptLevel)) {
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report_fatal_error("Target does not support machine code emission!");
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// Register routine for informing unwinding runtime about new EH frames
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#if defined(__GNUC__) && !defined(__ARM_EABI__) && !defined(__USING_SJLJ_EXCEPTIONS__)
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struct LibgccObjectInfo* LOI = (struct LibgccObjectInfo*)
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_keymgr_get_and_lock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST);
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// The key is created on demand, and libgcc creates it the first time an
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// exception occurs. Since we need the key to register frames, we create
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LOI = (LibgccObjectInfo*)calloc(sizeof(struct LibgccObjectInfo), 1);
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_keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, LOI);
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InstallExceptionTableRegister(DarwinRegisterFrame);
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InstallExceptionTableRegister(__register_frame);
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// Initialize passes.
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PM.doInitialization();
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AllJits->Remove(this);
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/// addModule - Add a new Module to the JIT. If we previously removed the last
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/// Module, we need re-initialize jitstate with a valid Module.
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void JIT::addModule(Module *M) {
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MutexGuard locked(lock);
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if (Modules.empty()) {
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assert(!jitstate && "jitstate should be NULL if Modules vector is empty!");
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jitstate = new JITState(M);
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FunctionPassManager &PM = jitstate->getPM(locked);
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PM.add(new TargetData(*TM.getTargetData()));
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// Turn the machine code intermediate representation into bytes in memory
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// that may be executed.
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if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
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report_fatal_error("Target does not support machine code emission!");
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// Initialize passes.
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PM.doInitialization();
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ExecutionEngine::addModule(M);
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/// removeModule - If we are removing the last Module, invalidate the jitstate
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/// since the PassManager it contains references a released Module.
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bool JIT::removeModule(Module *M) {
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bool result = ExecutionEngine::removeModule(M);
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MutexGuard locked(lock);
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if (jitstate->getModule() == M) {
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if (!jitstate && !Modules.empty()) {
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jitstate = new JITState(Modules[0]);
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FunctionPassManager &PM = jitstate->getPM(locked);
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PM.add(new TargetData(*TM.getTargetData()));
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// Turn the machine code intermediate representation into bytes in memory
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// that may be executed.
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if (TM.addPassesToEmitMachineCode(PM, *JCE, CodeGenOpt::Default)) {
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report_fatal_error("Target does not support machine code emission!");
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// Initialize passes.
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PM.doInitialization();
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/// run - Start execution with the specified function and arguments.
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GenericValue JIT::runFunction(Function *F,
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const std::vector<GenericValue> &ArgValues) {
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assert(F && "Function *F was null at entry to run()");
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void *FPtr = getPointerToFunction(F);
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assert(FPtr && "Pointer to fn's code was null after getPointerToFunction");
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const FunctionType *FTy = F->getFunctionType();
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const Type *RetTy = FTy->getReturnType();
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assert((FTy->getNumParams() == ArgValues.size() ||
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(FTy->isVarArg() && FTy->getNumParams() <= ArgValues.size())) &&
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"Wrong number of arguments passed into function!");
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assert(FTy->getNumParams() == ArgValues.size() &&
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"This doesn't support passing arguments through varargs (yet)!");
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// Handle some common cases first. These cases correspond to common `main'
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if (RetTy->isIntegerTy(32) || RetTy->isVoidTy()) {
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switch (ArgValues.size()) {
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if (FTy->getParamType(0)->isIntegerTy(32) &&
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FTy->getParamType(1)->isPointerTy() &&
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FTy->getParamType(2)->isPointerTy()) {
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int (*PF)(int, char **, const char **) =
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(int(*)(int, char **, const char **))(intptr_t)FPtr;
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// Call the function.
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rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
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(char **)GVTOP(ArgValues[1]),
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(const char **)GVTOP(ArgValues[2])));
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if (FTy->getParamType(0)->isIntegerTy(32) &&
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FTy->getParamType(1)->isPointerTy()) {
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int (*PF)(int, char **) = (int(*)(int, char **))(intptr_t)FPtr;
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// Call the function.
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rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue(),
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(char **)GVTOP(ArgValues[1])));
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if (FTy->getNumParams() == 1 &&
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FTy->getParamType(0)->isIntegerTy(32)) {
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int (*PF)(int) = (int(*)(int))(intptr_t)FPtr;
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rv.IntVal = APInt(32, PF(ArgValues[0].IntVal.getZExtValue()));
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// Handle cases where no arguments are passed first.
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if (ArgValues.empty()) {
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switch (RetTy->getTypeID()) {
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default: llvm_unreachable("Unknown return type for function call!");
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case Type::IntegerTyID: {
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unsigned BitWidth = cast<IntegerType>(RetTy)->getBitWidth();
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rv.IntVal = APInt(BitWidth, ((bool(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 8)
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rv.IntVal = APInt(BitWidth, ((char(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 16)
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rv.IntVal = APInt(BitWidth, ((short(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 32)
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rv.IntVal = APInt(BitWidth, ((int(*)())(intptr_t)FPtr)());
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else if (BitWidth <= 64)
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rv.IntVal = APInt(BitWidth, ((int64_t(*)())(intptr_t)FPtr)());
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llvm_unreachable("Integer types > 64 bits not supported");
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rv.IntVal = APInt(32, ((int(*)())(intptr_t)FPtr)());
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case Type::FloatTyID:
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rv.FloatVal = ((float(*)())(intptr_t)FPtr)();
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case Type::DoubleTyID:
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rv.DoubleVal = ((double(*)())(intptr_t)FPtr)();
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case Type::X86_FP80TyID:
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case Type::FP128TyID:
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case Type::PPC_FP128TyID:
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llvm_unreachable("long double not supported yet");
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case Type::PointerTyID:
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return PTOGV(((void*(*)())(intptr_t)FPtr)());
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// Okay, this is not one of our quick and easy cases. Because we don't have a
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// full FFI, we have to codegen a nullary stub function that just calls the
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// function we are interested in, passing in constants for all of the
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// arguments. Make this function and return.
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// First, create the function.
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FunctionType *STy=FunctionType::get(RetTy, false);
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Function *Stub = Function::Create(STy, Function::InternalLinkage, "",
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// Insert a basic block.
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BasicBlock *StubBB = BasicBlock::Create(F->getContext(), "", Stub);
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// Convert all of the GenericValue arguments over to constants. Note that we
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// currently don't support varargs.
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SmallVector<Value*, 8> Args;
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for (unsigned i = 0, e = ArgValues.size(); i != e; ++i) {
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const Type *ArgTy = FTy->getParamType(i);
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const GenericValue &AV = ArgValues[i];
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switch (ArgTy->getTypeID()) {
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default: llvm_unreachable("Unknown argument type for function call!");
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case Type::IntegerTyID:
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C = ConstantInt::get(F->getContext(), AV.IntVal);
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case Type::FloatTyID:
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C = ConstantFP::get(F->getContext(), APFloat(AV.FloatVal));
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case Type::DoubleTyID:
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C = ConstantFP::get(F->getContext(), APFloat(AV.DoubleVal));
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case Type::PPC_FP128TyID:
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case Type::X86_FP80TyID:
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case Type::FP128TyID:
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C = ConstantFP::get(F->getContext(), APFloat(AV.IntVal));
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case Type::PointerTyID:
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void *ArgPtr = GVTOP(AV);
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if (sizeof(void*) == 4)
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C = ConstantInt::get(Type::getInt32Ty(F->getContext()),
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(int)(intptr_t)ArgPtr);
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C = ConstantInt::get(Type::getInt64Ty(F->getContext()),
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// Cast the integer to pointer
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C = ConstantExpr::getIntToPtr(C, ArgTy);
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CallInst *TheCall = CallInst::Create(F, Args.begin(), Args.end(),
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TheCall->setCallingConv(F->getCallingConv());
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TheCall->setTailCall();
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if (!TheCall->getType()->isVoidTy())
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// Return result of the call.
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ReturnInst::Create(F->getContext(), TheCall, StubBB);
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ReturnInst::Create(F->getContext(), StubBB); // Just return void.
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// Finally, call our nullary stub function.
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GenericValue Result = runFunction(Stub, std::vector<GenericValue>());
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// Erase it, since no other function can have a reference to it.
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Stub->eraseFromParent();
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// And return the result.
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void JIT::RegisterJITEventListener(JITEventListener *L) {
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MutexGuard locked(lock);
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EventListeners.push_back(L);
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void JIT::UnregisterJITEventListener(JITEventListener *L) {
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MutexGuard locked(lock);
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std::vector<JITEventListener*>::reverse_iterator I=
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std::find(EventListeners.rbegin(), EventListeners.rend(), L);
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if (I != EventListeners.rend()) {
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std::swap(*I, EventListeners.back());
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EventListeners.pop_back();
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void JIT::NotifyFunctionEmitted(
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void *Code, size_t Size,
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const JITEvent_EmittedFunctionDetails &Details) {
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MutexGuard locked(lock);
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for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
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EventListeners[I]->NotifyFunctionEmitted(F, Code, Size, Details);
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void JIT::NotifyFreeingMachineCode(void *OldPtr) {
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MutexGuard locked(lock);
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for (unsigned I = 0, S = EventListeners.size(); I < S; ++I) {
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EventListeners[I]->NotifyFreeingMachineCode(OldPtr);
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/// runJITOnFunction - Run the FunctionPassManager full of
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/// just-in-time compilation passes on F, hopefully filling in
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/// GlobalAddress[F] with the address of F's machine code.
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void JIT::runJITOnFunction(Function *F, MachineCodeInfo *MCI) {
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MutexGuard locked(lock);
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class MCIListener : public JITEventListener {
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MachineCodeInfo *const MCI;
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MCIListener(MachineCodeInfo *mci) : MCI(mci) {}
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virtual void NotifyFunctionEmitted(const Function &,
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void *Code, size_t Size,
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const EmittedFunctionDetails &) {
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MCI->setAddress(Code);
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MCIListener MCIL(MCI);
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RegisterJITEventListener(&MCIL);
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runJITOnFunctionUnlocked(F, locked);
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UnregisterJITEventListener(&MCIL);
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void JIT::runJITOnFunctionUnlocked(Function *F, const MutexGuard &locked) {
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assert(!isAlreadyCodeGenerating && "Error: Recursive compilation detected!");
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jitTheFunction(F, locked);
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// If the function referred to another function that had not yet been
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// read from bitcode, and we are jitting non-lazily, emit it now.
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while (!jitstate->getPendingFunctions(locked).empty()) {
635
Function *PF = jitstate->getPendingFunctions(locked).back();
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jitstate->getPendingFunctions(locked).pop_back();
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assert(!PF->hasAvailableExternallyLinkage() &&
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"Externally-defined function should not be in pending list.");
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jitTheFunction(PF, locked);
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// Now that the function has been jitted, ask the JITEmitter to rewrite
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// the stub with real address of the function.
645
updateFunctionStub(PF);
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void JIT::jitTheFunction(Function *F, const MutexGuard &locked) {
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isAlreadyCodeGenerating = true;
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jitstate->getPM(locked).run(*F);
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isAlreadyCodeGenerating = false;
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// clear basic block addresses after this function is done
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getBasicBlockAddressMap(locked).clear();
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/// getPointerToFunction - This method is used to get the address of the
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/// specified function, compiling it if neccesary.
661
void *JIT::getPointerToFunction(Function *F) {
663
if (void *Addr = getPointerToGlobalIfAvailable(F))
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return Addr; // Check if function already code gen'd
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MutexGuard locked(lock);
668
// Now that this thread owns the lock, make sure we read in the function if it
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// exists in this Module.
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std::string ErrorMsg;
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if (F->Materialize(&ErrorMsg)) {
672
report_fatal_error("Error reading function '" + F->getName()+
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"' from bitcode file: " + ErrorMsg);
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// ... and check if another thread has already code gen'd the function.
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if (void *Addr = getPointerToGlobalIfAvailable(F))
680
if (F->isDeclaration() || F->hasAvailableExternallyLinkage()) {
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bool AbortOnFailure = !F->hasExternalWeakLinkage();
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void *Addr = getPointerToNamedFunction(F->getName(), AbortOnFailure);
683
addGlobalMapping(F, Addr);
687
runJITOnFunctionUnlocked(F, locked);
689
void *Addr = getPointerToGlobalIfAvailable(F);
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assert(Addr && "Code generation didn't add function to GlobalAddress table!");
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void JIT::addPointerToBasicBlock(const BasicBlock *BB, void *Addr) {
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MutexGuard locked(lock);
697
BasicBlockAddressMapTy::iterator I =
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getBasicBlockAddressMap(locked).find(BB);
699
if (I == getBasicBlockAddressMap(locked).end()) {
700
getBasicBlockAddressMap(locked)[BB] = Addr;
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// ignore repeats: some BBs can be split into few MBBs?
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void JIT::clearPointerToBasicBlock(const BasicBlock *BB) {
707
MutexGuard locked(lock);
708
getBasicBlockAddressMap(locked).erase(BB);
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void *JIT::getPointerToBasicBlock(BasicBlock *BB) {
712
// make sure it's function is compiled by JIT
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(void)getPointerToFunction(BB->getParent());
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// resolve basic block address
716
MutexGuard locked(lock);
718
BasicBlockAddressMapTy::iterator I =
719
getBasicBlockAddressMap(locked).find(BB);
720
if (I != getBasicBlockAddressMap(locked).end()) {
723
assert(0 && "JIT does not have BB address for address-of-label, was"
724
" it eliminated by optimizer?");
729
/// getOrEmitGlobalVariable - Return the address of the specified global
730
/// variable, possibly emitting it to memory if needed. This is used by the
732
void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
733
MutexGuard locked(lock);
735
void *Ptr = getPointerToGlobalIfAvailable(GV);
738
// If the global is external, just remember the address.
739
if (GV->isDeclaration() || GV->hasAvailableExternallyLinkage()) {
740
#if HAVE___DSO_HANDLE
741
if (GV->getName() == "__dso_handle")
742
return (void*)&__dso_handle;
744
Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(GV->getName());
746
report_fatal_error("Could not resolve external global address: "
749
addGlobalMapping(GV, Ptr);
751
// If the global hasn't been emitted to memory yet, allocate space and
752
// emit it into memory.
753
Ptr = getMemoryForGV(GV);
754
addGlobalMapping(GV, Ptr);
755
EmitGlobalVariable(GV); // Initialize the variable.
760
/// recompileAndRelinkFunction - This method is used to force a function
761
/// which has already been compiled, to be compiled again, possibly
762
/// after it has been modified. Then the entry to the old copy is overwritten
763
/// with a branch to the new copy. If there was no old copy, this acts
764
/// just like JIT::getPointerToFunction().
766
void *JIT::recompileAndRelinkFunction(Function *F) {
767
void *OldAddr = getPointerToGlobalIfAvailable(F);
769
// If it's not already compiled there is no reason to patch it up.
770
if (OldAddr == 0) { return getPointerToFunction(F); }
772
// Delete the old function mapping.
773
addGlobalMapping(F, 0);
775
// Recodegen the function
778
// Update state, forward the old function to the new function.
779
void *Addr = getPointerToGlobalIfAvailable(F);
780
assert(Addr && "Code generation didn't add function to GlobalAddress table!");
781
TJI.replaceMachineCodeForFunction(OldAddr, Addr);
785
/// getMemoryForGV - This method abstracts memory allocation of global
786
/// variable so that the JIT can allocate thread local variables depending
789
char* JIT::getMemoryForGV(const GlobalVariable* GV) {
792
// GlobalVariable's which are not "constant" will cause trouble in a server
793
// situation. It's returned in the same block of memory as code which may
795
if (isGVCompilationDisabled() && !GV->isConstant()) {
796
report_fatal_error("Compilation of non-internal GlobalValue is disabled!");
799
// Some applications require globals and code to live together, so they may
800
// be allocated into the same buffer, but in general globals are allocated
801
// through the memory manager which puts them near the code but not in the
803
const Type *GlobalType = GV->getType()->getElementType();
804
size_t S = getTargetData()->getTypeAllocSize(GlobalType);
805
size_t A = getTargetData()->getPreferredAlignment(GV);
806
if (GV->isThreadLocal()) {
807
MutexGuard locked(lock);
808
Ptr = TJI.allocateThreadLocalMemory(S);
809
} else if (TJI.allocateSeparateGVMemory()) {
811
Ptr = (char*)malloc(S);
813
// Allocate S+A bytes of memory, then use an aligned pointer within that
815
Ptr = (char*)malloc(S+A);
816
unsigned MisAligned = ((intptr_t)Ptr & (A-1));
817
Ptr = Ptr + (MisAligned ? (A-MisAligned) : 0);
819
} else if (AllocateGVsWithCode) {
820
Ptr = (char*)JCE->allocateSpace(S, A);
822
Ptr = (char*)JCE->allocateGlobal(S, A);
827
void JIT::addPendingFunction(Function *F) {
828
MutexGuard locked(lock);
829
jitstate->getPendingFunctions(locked).push_back(F);
833
JITEventListener::~JITEventListener() {}
added
removed
libclamav/c++/llvm/lib/ExecutionEngine/JIT/JIT.cpp
