107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
//===- JITLoaderGDB.h - Register objects via GDB JIT interface -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.h"
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#include "llvm/ExecutionEngine/JITSymbol.h"
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#include "llvm/Support/BinaryStreamReader.h"
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#include "llvm/Support/FormatVariadic.h"
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#include <cstdint>
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#include <mutex>
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#include <utility>
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#define DEBUG_TYPE "orc"
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// First version as landed in August 2009
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static constexpr uint32_t JitDescriptorVersion = 1;
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extern "C" {
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// We put information about the JITed function in this global, which the
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// debugger reads. Make sure to specify the version statically, because the
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// debugger checks the version before we can set it during runtime.
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struct jit_descriptor __jit_debug_descriptor = {JitDescriptorVersion, 0,
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nullptr, nullptr};
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// Debuggers that implement the GDB JIT interface put a special breakpoint in
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// this function.
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LLVM_ATTRIBUTE_NOINLINE void __jit_debug_register_code() {
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// The noinline and the asm prevent calls to this function from being
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// optimized out.
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#if !defined(_MSC_VER)
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asm volatile("" ::: "memory");
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#endif
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}
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}
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using namespace llvm;
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using namespace llvm::orc;
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// Register debug object, return error message or null for success.
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static void appendJITDebugDescriptor(const char *ObjAddr, size_t Size) {
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LLVM_DEBUG({
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dbgs() << "Adding debug object to GDB JIT interface "
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<< formatv("([{0:x16} -- {1:x16}])",
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reinterpret_cast<uintptr_t>(ObjAddr),
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reinterpret_cast<uintptr_t>(ObjAddr + Size))
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<< "\n";
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});
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jit_code_entry *E = new jit_code_entry;
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E->symfile_addr = ObjAddr;
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E->symfile_size = Size;
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E->prev_entry = nullptr;
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// Serialize rendezvous with the debugger as well as access to shared data.
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static std::mutex JITDebugLock;
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std::lock_guard<std::mutex> Lock(JITDebugLock);
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// Insert this entry at the head of the list.
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jit_code_entry *NextEntry = __jit_debug_descriptor.first_entry;
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E->next_entry = NextEntry;
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if (NextEntry) {
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NextEntry->prev_entry = E;
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}
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__jit_debug_descriptor.first_entry = E;
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__jit_debug_descriptor.relevant_entry = E;
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__jit_debug_descriptor.action_flag = JIT_REGISTER_FN;
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}
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extern "C" orc::shared::CWrapperFunctionResult
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llvm_orc_registerJITLoaderGDBAllocAction(const char *Data, size_t Size) {
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using namespace orc::shared;
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return WrapperFunction<SPSError(SPSExecutorAddrRange, bool)>::handle(
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Data, Size,
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[](ExecutorAddrRange R, bool AutoRegisterCode) {
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appendJITDebugDescriptor(R.Start.toPtr<const char *>(),
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R.size());
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// Run into the rendezvous breakpoint.
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if (AutoRegisterCode)
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__jit_debug_register_code();
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return Error::success();
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})
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.release();
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}
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extern "C" orc::shared::CWrapperFunctionResult
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llvm_orc_registerJITLoaderGDBWrapper(const char *Data, uint64_t Size) {
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using namespace orc::shared;
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return WrapperFunction<SPSError(SPSExecutorAddrRange, bool)>::handle(
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Data, Size,
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[](ExecutorAddrRange R, bool AutoRegisterCode) {
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appendJITDebugDescriptor(R.Start.toPtr<const char *>(),
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R.size());
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// Run into the rendezvous breakpoint.
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if (AutoRegisterCode)
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__jit_debug_register_code();
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return Error::success();
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})
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.release();
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}
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