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//===- JITLoaderGDB.h - Register objects via GDB JIT interface -*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.h"
#include "llvm/ExecutionEngine/JITSymbol.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/FormatVariadic.h"
#include <cstdint>
#include <mutex>
#include <utility>
#define DEBUG_TYPE "orc"
// First version as landed in August 2009
static constexpr uint32_t JitDescriptorVersion = 1;
// Keep 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 = {JitDescriptorVersion, 0,
nullptr, nullptr};
// Debuggers that implement the GDB JIT interface put a special 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
}
}
using namespace llvm;
using namespace llvm::orc;
// Register debug object, return error message or null for success.
static void registerJITLoaderGDBImpl(const char *ObjAddr, size_t Size) {
LLVM_DEBUG({
dbgs() << "Registering debug object with GDB JIT interface "
<< formatv("([{0:x16} -- {1:x16}])",
reinterpret_cast<uintptr_t>(ObjAddr),
reinterpret_cast<uintptr_t>(ObjAddr + Size))
<< "\n";
});
jit_code_entry *E = new jit_code_entry;
E->symfile_addr = ObjAddr;
E->symfile_size = Size;
E->prev_entry = nullptr;
// Serialize rendezvous with the debugger as well as access to shared data.
static std::mutex JITDebugLock;
std::lock_guard<std::mutex> Lock(JITDebugLock);
// Insert this entry at the head of the list.
jit_code_entry *NextEntry = __jit_debug_descriptor.first_entry;
E->next_entry = NextEntry;
if (NextEntry) {
NextEntry->prev_entry = E;
}
__jit_debug_descriptor.first_entry = E;
__jit_debug_descriptor.relevant_entry = E;
// Run into the rendezvous breakpoint.
__jit_debug_descriptor.action_flag = JIT_REGISTER_FN;
__jit_debug_register_code();
}
extern "C" orc::shared::CWrapperFunctionResult
llvm_orc_registerJITLoaderGDBAllocAction(const char *Data, size_t Size) {
using namespace orc::shared;
return WrapperFunction<SPSError(SPSExecutorAddrRange)>::handle(
Data, Size,
[](ExecutorAddrRange R) {
registerJITLoaderGDBImpl(R.Start.toPtr<const char *>(),
R.size());
return Error::success();
})
.release();
}
extern "C" orc::shared::CWrapperFunctionResult
llvm_orc_registerJITLoaderGDBWrapper(const char *Data, uint64_t Size) {
using namespace orc::shared;
return WrapperFunction<SPSError(SPSExecutorAddrRange)>::handle(
Data, Size,
[](ExecutorAddrRange R) {
registerJITLoaderGDBImpl(R.Start.toPtr<const char *>(),
R.size());
return Error::success();
})
.release();
}
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