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-rw-r--r--lib/ExecutionEngine/JIT/OProfileJITEventListener.cpp192
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diff --git a/lib/ExecutionEngine/JIT/OProfileJITEventListener.cpp b/lib/ExecutionEngine/JIT/OProfileJITEventListener.cpp
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-//===-- OProfileJITEventListener.cpp - Tell OProfile about JITted code ----===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines a JITEventListener object that calls into OProfile to tell
-// it about JITted functions. For now, we only record function names and sizes,
-// but eventually we'll also record line number information.
-//
-// See http://oprofile.sourceforge.net/doc/devel/jit-interface.html for the
-// definition of the interface we're using.
-//
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "oprofile-jit-event-listener"
-#include "llvm/Function.h"
-#include "llvm/Metadata.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/Analysis/DebugInfo.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/ExecutionEngine/JITEventListener.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/ValueHandle.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/Errno.h"
-#include "llvm/Config/config.h"
-#include <stddef.h>
-using namespace llvm;
-
-#if USE_OPROFILE
-
-#include <opagent.h>
-
-namespace {
-
-class OProfileJITEventListener : public JITEventListener {
- op_agent_t Agent;
-public:
- OProfileJITEventListener();
- ~OProfileJITEventListener();
-
- virtual void NotifyFunctionEmitted(const Function &F,
- void *FnStart, size_t FnSize,
- const EmittedFunctionDetails &Details);
- virtual void NotifyFreeingMachineCode(void *OldPtr);
-};
-
-OProfileJITEventListener::OProfileJITEventListener()
- : Agent(op_open_agent()) {
- if (Agent == NULL) {
- const std::string err_str = sys::StrError();
- DEBUG(dbgs() << "Failed to connect to OProfile agent: " << err_str << "\n");
- } else {
- DEBUG(dbgs() << "Connected to OProfile agent.\n");
- }
-}
-
-OProfileJITEventListener::~OProfileJITEventListener() {
- if (Agent != NULL) {
- if (op_close_agent(Agent) == -1) {
- const std::string err_str = sys::StrError();
- DEBUG(dbgs() << "Failed to disconnect from OProfile agent: "
- << err_str << "\n");
- } else {
- DEBUG(dbgs() << "Disconnected from OProfile agent.\n");
- }
- }
-}
-
-class FilenameCache {
- // Holds the filename of each Scope, so that we can pass a null-terminated
- // string into oprofile. Use an AssertingVH rather than a ValueMap because we
- // shouldn't be modifying any MDNodes while this map is alive.
- DenseMap<AssertingVH<MDNode>, std::string> Filenames;
-
- public:
- const char *getFilename(MDNode *Scope) {
- std::string &Filename = Filenames[Scope];
- if (Filename.empty()) {
- Filename = DIScope(Scope).getFilename();
- }
- return Filename.c_str();
- }
-};
-
-static debug_line_info LineStartToOProfileFormat(
- const MachineFunction &MF, FilenameCache &Filenames,
- uintptr_t Address, DebugLoc Loc) {
- debug_line_info Result;
- Result.vma = Address;
- Result.lineno = Loc.getLine();
- Result.filename = Filenames.getFilename(
- Loc.getScope(MF.getFunction()->getContext()));
- DEBUG(dbgs() << "Mapping " << reinterpret_cast<void*>(Result.vma) << " to "
- << Result.filename << ":" << Result.lineno << "\n");
- return Result;
-}
-
-// Adds the just-emitted function to the symbol table.
-void OProfileJITEventListener::NotifyFunctionEmitted(
- const Function &F, void *FnStart, size_t FnSize,
- const EmittedFunctionDetails &Details) {
- assert(F.hasName() && FnStart != 0 && "Bad symbol to add");
- if (op_write_native_code(Agent, F.getName().data(),
- reinterpret_cast<uint64_t>(FnStart),
- FnStart, FnSize) == -1) {
- DEBUG(dbgs() << "Failed to tell OProfile about native function "
- << F.getName() << " at ["
- << FnStart << "-" << ((char*)FnStart + FnSize) << "]\n");
- return;
- }
-
- if (!Details.LineStarts.empty()) {
- // Now we convert the line number information from the address/DebugLoc
- // format in Details to the address/filename/lineno format that OProfile
- // expects. Note that OProfile 0.9.4 has a bug that causes it to ignore
- // line numbers for addresses above 4G.
- FilenameCache Filenames;
- std::vector<debug_line_info> LineInfo;
- LineInfo.reserve(1 + Details.LineStarts.size());
-
- DebugLoc FirstLoc = Details.LineStarts[0].Loc;
- assert(!FirstLoc.isUnknown()
- && "LineStarts should not contain unknown DebugLocs");
- MDNode *FirstLocScope = FirstLoc.getScope(F.getContext());
- DISubprogram FunctionDI = getDISubprogram(FirstLocScope);
- if (FunctionDI.Verify()) {
- // If we have debug info for the function itself, use that as the line
- // number of the first several instructions. Otherwise, after filling
- // LineInfo, we'll adjust the address of the first line number to point at
- // the start of the function.
- debug_line_info line_info;
- line_info.vma = reinterpret_cast<uintptr_t>(FnStart);
- line_info.lineno = FunctionDI.getLineNumber();
- line_info.filename = Filenames.getFilename(FirstLocScope);
- LineInfo.push_back(line_info);
- }
-
- for (std::vector<EmittedFunctionDetails::LineStart>::const_iterator
- I = Details.LineStarts.begin(), E = Details.LineStarts.end();
- I != E; ++I) {
- LineInfo.push_back(LineStartToOProfileFormat(
- *Details.MF, Filenames, I->Address, I->Loc));
- }
-
- // In case the function didn't have line info of its own, adjust the first
- // line info's address to include the start of the function.
- LineInfo[0].vma = reinterpret_cast<uintptr_t>(FnStart);
-
- if (op_write_debug_line_info(Agent, FnStart,
- LineInfo.size(), &*LineInfo.begin()) == -1) {
- DEBUG(dbgs()
- << "Failed to tell OProfile about line numbers for native function "
- << F.getName() << " at ["
- << FnStart << "-" << ((char*)FnStart + FnSize) << "]\n");
- }
- }
-}
-
-// Removes the being-deleted function from the symbol table.
-void OProfileJITEventListener::NotifyFreeingMachineCode(void *FnStart) {
- assert(FnStart && "Invalid function pointer");
- if (op_unload_native_code(Agent, reinterpret_cast<uint64_t>(FnStart)) == -1) {
- DEBUG(dbgs()
- << "Failed to tell OProfile about unload of native function at "
- << FnStart << "\n");
- }
-}
-
-} // anonymous namespace.
-
-namespace llvm {
-JITEventListener *createOProfileJITEventListener() {
- return new OProfileJITEventListener;
-}
-}
-
-#else // USE_OPROFILE
-
-namespace llvm {
-// By defining this to return NULL, we can let clients call it unconditionally,
-// even if they haven't configured with the OProfile libraries.
-JITEventListener *createOProfileJITEventListener() {
- return NULL;
-}
-} // namespace llvm
-
-#endif // USE_OPROFILE