llvm-6502/lib/ExecutionEngine/GDBRegistrationListener.cpp

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//===----- GDBRegistrationListener.cpp - Registers objects with GDB -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/DenseMap.h"
#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/MutexGuard.h"
using namespace llvm;
using namespace llvm::object;
// This must be kept in sync with gdb/gdb/jit.h .
extern "C" {
typedef enum {
JIT_NOACTION = 0,
JIT_REGISTER_FN,
JIT_UNREGISTER_FN
} jit_actions_t;
struct jit_code_entry {
struct jit_code_entry *next_entry;
struct jit_code_entry *prev_entry;
const char *symfile_addr;
uint64_t symfile_size;
};
struct jit_descriptor {
uint32_t version;
// This should be jit_actions_t, but we want to be specific about the
// bit-width.
uint32_t action_flag;
struct jit_code_entry *relevant_entry;
struct jit_code_entry *first_entry;
};
// We put information about the JITed function in this global, which the
// debugger reads. Make sure to specify the version statically, because the
// debugger checks the version before we can set it during runtime.
struct jit_descriptor __jit_debug_descriptor = { 1, 0, nullptr, nullptr };
// Debuggers puts a breakpoint in this function.
LLVM_ATTRIBUTE_NOINLINE void __jit_debug_register_code() {
// The noinline and the asm prevent calls to this function from being
// optimized out.
#if !defined(_MSC_VER)
asm volatile("":::"memory");
#endif
}
}
namespace {
struct RegisteredObjectInfo {
RegisteredObjectInfo() {}
RegisteredObjectInfo(std::size_t Size, jit_code_entry *Entry,
OwningBinary<ObjectFile> Obj)
: Size(Size), Entry(Entry), Obj(std::move(Obj)) {}
RegisteredObjectInfo(RegisteredObjectInfo &&Other)
: Size(Other.Size), Entry(Other.Entry), Obj(std::move(Other.Obj)) {}
RegisteredObjectInfo& operator=(RegisteredObjectInfo &&Other) {
Size = Other.Size;
Entry = Other.Entry;
Obj = std::move(Other.Obj);
return *this;
}
std::size_t Size;
jit_code_entry *Entry;
OwningBinary<ObjectFile> Obj;
};
// Buffer for an in-memory object file in executable memory
typedef llvm::DenseMap< const char*, RegisteredObjectInfo>
RegisteredObjectBufferMap;
/// Global access point for the JIT debugging interface designed for use with a
/// singleton toolbox. Handles thread-safe registration and deregistration of
/// object files that are in executable memory managed by the client of this
/// class.
class GDBJITRegistrationListener : public JITEventListener {
/// A map of in-memory object files that have been registered with the
/// JIT interface.
RegisteredObjectBufferMap ObjectBufferMap;
public:
/// Instantiates the JIT service.
GDBJITRegistrationListener() : ObjectBufferMap() {}
/// Unregisters each object that was previously registered and releases all
/// internal resources.
virtual ~GDBJITRegistrationListener();
/// Creates an entry in the JIT registry for the buffer @p Object,
/// which must contain an object file in executable memory with any
/// debug information for the debugger.
void NotifyObjectEmitted(const ObjectFile &Object,
const RuntimeDyld::LoadedObjectInfo &L) override;
/// Removes the internal registration of @p Object, and
/// frees associated resources.
/// Returns true if @p Object was found in ObjectBufferMap.
void NotifyFreeingObject(const ObjectFile &Object) override;
private:
/// Deregister the debug info for the given object file from the debugger
/// and delete any temporary copies. This private method does not remove
/// the function from Map so that it can be called while iterating over Map.
void deregisterObjectInternal(RegisteredObjectBufferMap::iterator I);
};
/// Lock used to serialize all jit registration events, since they
/// modify global variables.
ManagedStatic<sys::Mutex> JITDebugLock;
/// Do the registration.
void NotifyDebugger(jit_code_entry* JITCodeEntry) {
__jit_debug_descriptor.action_flag = JIT_REGISTER_FN;
// Insert this entry at the head of the list.
JITCodeEntry->prev_entry = nullptr;
jit_code_entry* NextEntry = __jit_debug_descriptor.first_entry;
JITCodeEntry->next_entry = NextEntry;
if (NextEntry) {
NextEntry->prev_entry = JITCodeEntry;
}
__jit_debug_descriptor.first_entry = JITCodeEntry;
__jit_debug_descriptor.relevant_entry = JITCodeEntry;
__jit_debug_register_code();
}
GDBJITRegistrationListener::~GDBJITRegistrationListener() {
// Free all registered object files.
llvm::MutexGuard locked(*JITDebugLock);
for (RegisteredObjectBufferMap::iterator I = ObjectBufferMap.begin(),
E = ObjectBufferMap.end();
I != E; ++I) {
// Call the private method that doesn't update the map so our iterator
// doesn't break.
deregisterObjectInternal(I);
}
ObjectBufferMap.clear();
}
void GDBJITRegistrationListener::NotifyObjectEmitted(
const ObjectFile &Object,
const RuntimeDyld::LoadedObjectInfo &L) {
OwningBinary<ObjectFile> DebugObj = L.getObjectForDebug(Object);
// Bail out if debug objects aren't supported.
if (!DebugObj.getBinary())
return;
const char *Buffer = DebugObj.getBinary()->getMemoryBufferRef().getBufferStart();
size_t Size = DebugObj.getBinary()->getMemoryBufferRef().getBufferSize();
const char *Key = Object.getMemoryBufferRef().getBufferStart();
assert(Key && "Attempt to register a null object with a debugger.");
llvm::MutexGuard locked(*JITDebugLock);
assert(ObjectBufferMap.find(Key) == ObjectBufferMap.end() &&
"Second attempt to perform debug registration.");
jit_code_entry* JITCodeEntry = new jit_code_entry();
if (!JITCodeEntry) {
llvm::report_fatal_error(
"Allocation failed when registering a JIT entry!\n");
} else {
JITCodeEntry->symfile_addr = Buffer;
JITCodeEntry->symfile_size = Size;
ObjectBufferMap[Key] = RegisteredObjectInfo(Size, JITCodeEntry,
std::move(DebugObj));
NotifyDebugger(JITCodeEntry);
}
}
void GDBJITRegistrationListener::NotifyFreeingObject(const ObjectFile& Object) {
const char *Key = Object.getMemoryBufferRef().getBufferStart();
llvm::MutexGuard locked(*JITDebugLock);
RegisteredObjectBufferMap::iterator I = ObjectBufferMap.find(Key);
if (I != ObjectBufferMap.end()) {
deregisterObjectInternal(I);
ObjectBufferMap.erase(I);
}
}
void GDBJITRegistrationListener::deregisterObjectInternal(
RegisteredObjectBufferMap::iterator I) {
jit_code_entry*& JITCodeEntry = I->second.Entry;
// Do the unregistration.
{
__jit_debug_descriptor.action_flag = JIT_UNREGISTER_FN;
// Remove the jit_code_entry from the linked list.
jit_code_entry* PrevEntry = JITCodeEntry->prev_entry;
jit_code_entry* NextEntry = JITCodeEntry->next_entry;
if (NextEntry) {
NextEntry->prev_entry = PrevEntry;
}
if (PrevEntry) {
PrevEntry->next_entry = NextEntry;
}
else {
assert(__jit_debug_descriptor.first_entry == JITCodeEntry);
__jit_debug_descriptor.first_entry = NextEntry;
}
// Tell the debugger which entry we removed, and unregister the code.
__jit_debug_descriptor.relevant_entry = JITCodeEntry;
__jit_debug_register_code();
}
delete JITCodeEntry;
JITCodeEntry = nullptr;
}
llvm::ManagedStatic<GDBJITRegistrationListener> GDBRegListener;
} // end namespace
namespace llvm {
JITEventListener* JITEventListener::createGDBRegistrationListener() {
return &*GDBRegListener;
}
} // namespace llvm