linux-sgx-trts-modified/external/vtune/linux/include/llvm_jit_event_listener.hpp

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/*
 * This file implements an interface bridge from Low-Level Virtual Machine
 * llvm::JITEventListener to Intel JIT Profiling API.  It passes the function
 * and line information to the appropriate functions in the JIT profiling
 * interface so that any LLVM-based JIT engine can emit the JIT code
 * notifications that the profiler will receive.
 *
 * Usage model:
 *
 * 1. Register the listener implementation instance with the execution engine:
 *
 *    #include <llvm_jit_event_listener.hpp>
 *    ...
 *    ExecutionEngine *TheExecutionEngine;
 *    ...
 *    TheExecutionEngine = EngineBuilder(TheModule).create();
 *    ...
 *    __itt_llvm_jit_event_listener jitListener;
 *    TheExecutionEngine->RegisterJITEventListener(&jitListener);
 *    ...
 *
 * 2. When compiling make sure to add the ITT API include directory to the
 *    compiler include directories, ITT API library directory to the linker
 *    library directories and link with jitprofling static library.
 */

#ifndef __ITT_LLVM_JIT_EVENT_LISTENER_HPP__
#define __ITT_LLVM_JIT_EVENT_LISTENER_HPP__

#include "jitprofiling.h"

#include <llvm/Function.h>
#include <llvm/ExecutionEngine/JITEventListener.h>
#include <llvm/ADT/StringRef.h>
#include <llvm/Analysis/DebugInfo.h>

#include <map>
#include <cassert>

// Uncomment the line below to turn on logging to stderr
#define JITPROFILING_DEBUG_ENABLE

// Some elementary logging support
#ifdef JITPROFILING_DEBUG_ENABLE
#include <cstdio>
#include <cstdarg>
static void _jit_debug(const char* format, ...)
{
    va_list args;
    va_start(args, format);
    vfprintf(stderr, format, args);
    va_end(args);
}
// Use the macro as JITDEBUG(("foo: %d", foo_val));
#define JITDEBUG(x) \
    do { \
        _jit_debug("jit-listener: "); \
        _jit_debug x; \
    } \
    while (0)
#else
#define JITDEBUG(x)
#endif

// LLVM JIT event listener, translates the notifications to the JIT profiling
// API information.
class __itt_llvm_jit_event_listener : public llvm::JITEventListener
{
public:
    __itt_llvm_jit_event_listener() {}

public:
    virtual void NotifyFunctionEmitted(const llvm::Function &F,
        void *Code, size_t Size, const EmittedFunctionDetails &Details)
    {
        std::string name = F.getName().str();
        JITDEBUG(("function jitted:\n"));
        JITDEBUG(("  addr=0x%08x\n", (int)Code));
        JITDEBUG(("  name=`%s'\n", name.c_str()));
        JITDEBUG(("  code-size=%d\n", (int)Size));
        JITDEBUG(("  line-infos-count=%d\n", Details.LineStarts.size()));

        // The method must not be in the map - the entry must have been cleared
        // from the map in NotifyFreeingMachineCode in case of rejitting.
        assert(m_addr2MethodId.find(Code) == m_addr2MethodId.end());

        int mid = iJIT_GetNewMethodID();
        m_addr2MethodId[Code] = mid;

        iJIT_Method_Load mload;
        memset(&mload, 0, sizeof mload);
        mload.method_id = mid;

        // Populate the method size and name information
        // TODO: The JIT profiling API should have members as const char pointers.
        mload.method_name = (char*)name.c_str();
        mload.method_load_address = Code;
        mload.method_size = (unsigned int)Size;

        // Populate line information now.
        // From the JIT API documentation it is not quite clear whether the
        // line information can be given in ranges, so we'll populate it for
        // every byte of the function, hmm.
        std::string srcFilePath;
        std::vector<LineNumberInfo> lineInfos;
        char *addr = (char*)Code;
        char *lineAddr = addr;          // Exclusive end point at which current
                                        // line info changes.
        const llvm::DebugLoc* loc = 0;  // Current line info
        int lineIndex = -1;             // Current index into the line info table
        for (int i = 0; i < Size; ++i, ++addr) {
            while (addr >= lineAddr) {
                if (lineIndex >= 0 && lineIndex < Details.LineStarts.size()) {
                    loc = &Details.LineStarts[lineIndex].Loc;
                    std::string p = getSrcFilePath(F.getContext(), *loc);
                    assert(srcFilePath.empty() || p == srcFilePath);
                    srcFilePath = p;
                } else {
                    loc = NULL;
                }
                lineIndex++;
                if (lineIndex >= 0 && lineIndex < Details.LineStarts.size()) {
                    lineAddr = (char*)Details.LineStarts[lineIndex].Address;
                } else {
                    lineAddr = addr + Size;
                }
            }
            if (loc) {
                int line = loc->getLine();
                LineNumberInfo info = { i, line };
                lineInfos.push_back(info);
                JITDEBUG(("  addr 0x%08x -> line %d\n", addr, line));
            }
        }
        if (!lineInfos.empty()) {
            mload.line_number_size = lineInfos.size();
            JITDEBUG(("  translated to %d line infos to JIT", (int)lineInfos.size()));
            mload.line_number_table = &lineInfos[0];
            mload.source_file_name = (char*)srcFilePath.c_str();
        }

        iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED, &mload);
    }

    virtual void NotifyFreeingMachineCode(void *OldPtr)
    {
        JITDEBUG(("function unjitted\n"));
        JITDEBUG(("  addr=0x%08x\n", (int)OldPtr));
        Addr2MethodId::iterator it = m_addr2MethodId.find(OldPtr);
        assert(it != m_addr2MethodId.end());
        iJIT_Method_Id mid = { it->second };
        iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_UNLOAD_START, &mid);
        m_addr2MethodId.erase(it);
    }

private:
    std::string getSrcFilePath(const llvm::LLVMContext& ctx, const llvm::DebugLoc& loc)
    {
        llvm::MDNode* node = loc.getAsMDNode(ctx);
        llvm::DILocation srcLoc(node);
        return srcLoc.getDirectory().str() + "/" + srcLoc.getFilename().str();
    }

private:
    /// Don't copy
    __itt_llvm_jit_event_listener(const __itt_llvm_jit_event_listener&);
    __itt_llvm_jit_event_listener& operator=(const __itt_llvm_jit_event_listener&);

private:
    typedef std::vector<LineNumberInfo> LineInfoList;

    // The method unload notification in VTune JIT profiling API takes the
    // method ID, not method address so have to maintain the mapping.  Is
    // there a more efficient and simple way to do this like attaching the
    // method ID information somehow to the LLVM function instance?
    //
    // TODO: It would be more convenient for the JIT API to take the method
    // address, not method ID.
    typedef std::map<const void*, int> Addr2MethodId;
    Addr2MethodId m_addr2MethodId;
};

#endif // Header guard