mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-06 09:54:49 +00:00
Sooooo many of these had incorrect or strange main module includes. I have manually inspected all of these, and fixed the main module include to be the nearest plausible thing I could find. If you own or care about any of these source files, I encourage you to take some time and check that these edits were sensible. I can't have broken anything (I strictly added headers, and reordered them, never removed), but they may not be the headers you'd really like to identify as containing the API being implemented. Many forward declarations and missing includes were added to a header files to allow them to parse cleanly when included first. The main module rule does in fact have its merits. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169131 91177308-0d34-0410-b5e6-96231b3b80d8
118 lines
4.4 KiB
C++
118 lines
4.4 KiB
C++
//===- EdgeProfiling.cpp - Insert counters for edge profiling -------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This pass instruments the specified program with counters for edge profiling.
|
|
// Edge profiling can give a reasonable approximation of the hot paths through a
|
|
// program, and is used for a wide variety of program transformations.
|
|
//
|
|
// Note that this implementation is very naive. We insert a counter for *every*
|
|
// edge in the program, instead of using control flow information to prune the
|
|
// number of counters inserted.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
#define DEBUG_TYPE "insert-edge-profiling"
|
|
|
|
#include "llvm/Transforms/Instrumentation.h"
|
|
#include "ProfilingUtils.h"
|
|
#include "llvm/ADT/Statistic.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
|
|
#include <set>
|
|
using namespace llvm;
|
|
|
|
STATISTIC(NumEdgesInserted, "The # of edges inserted.");
|
|
|
|
namespace {
|
|
class EdgeProfiler : public ModulePass {
|
|
bool runOnModule(Module &M);
|
|
public:
|
|
static char ID; // Pass identification, replacement for typeid
|
|
EdgeProfiler() : ModulePass(ID) {
|
|
initializeEdgeProfilerPass(*PassRegistry::getPassRegistry());
|
|
}
|
|
|
|
virtual const char *getPassName() const {
|
|
return "Edge Profiler";
|
|
}
|
|
};
|
|
}
|
|
|
|
char EdgeProfiler::ID = 0;
|
|
INITIALIZE_PASS(EdgeProfiler, "insert-edge-profiling",
|
|
"Insert instrumentation for edge profiling", false, false)
|
|
|
|
ModulePass *llvm::createEdgeProfilerPass() { return new EdgeProfiler(); }
|
|
|
|
bool EdgeProfiler::runOnModule(Module &M) {
|
|
Function *Main = M.getFunction("main");
|
|
if (Main == 0) {
|
|
errs() << "WARNING: cannot insert edge profiling into a module"
|
|
<< " with no main function!\n";
|
|
return false; // No main, no instrumentation!
|
|
}
|
|
|
|
std::set<BasicBlock*> BlocksToInstrument;
|
|
unsigned NumEdges = 0;
|
|
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
|
|
if (F->isDeclaration()) continue;
|
|
// Reserve space for (0,entry) edge.
|
|
++NumEdges;
|
|
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
|
|
// Keep track of which blocks need to be instrumented. We don't want to
|
|
// instrument blocks that are added as the result of breaking critical
|
|
// edges!
|
|
BlocksToInstrument.insert(BB);
|
|
NumEdges += BB->getTerminator()->getNumSuccessors();
|
|
}
|
|
}
|
|
|
|
Type *ATy = ArrayType::get(Type::getInt32Ty(M.getContext()), NumEdges);
|
|
GlobalVariable *Counters =
|
|
new GlobalVariable(M, ATy, false, GlobalValue::InternalLinkage,
|
|
Constant::getNullValue(ATy), "EdgeProfCounters");
|
|
NumEdgesInserted = NumEdges;
|
|
|
|
// Instrument all of the edges...
|
|
unsigned i = 0;
|
|
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
|
|
if (F->isDeclaration()) continue;
|
|
// Create counter for (0,entry) edge.
|
|
IncrementCounterInBlock(&F->getEntryBlock(), i++, Counters);
|
|
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
|
|
if (BlocksToInstrument.count(BB)) { // Don't instrument inserted blocks
|
|
// Okay, we have to add a counter of each outgoing edge. If the
|
|
// outgoing edge is not critical don't split it, just insert the counter
|
|
// in the source or destination of the edge.
|
|
TerminatorInst *TI = BB->getTerminator();
|
|
for (unsigned s = 0, e = TI->getNumSuccessors(); s != e; ++s) {
|
|
// If the edge is critical, split it.
|
|
SplitCriticalEdge(TI, s, this);
|
|
|
|
// Okay, we are guaranteed that the edge is no longer critical. If we
|
|
// only have a single successor, insert the counter in this block,
|
|
// otherwise insert it in the successor block.
|
|
if (TI->getNumSuccessors() == 1) {
|
|
// Insert counter at the start of the block
|
|
IncrementCounterInBlock(BB, i++, Counters, false);
|
|
} else {
|
|
// Insert counter at the start of the block
|
|
IncrementCounterInBlock(TI->getSuccessor(s), i++, Counters);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Add the initialization call to main.
|
|
InsertProfilingInitCall(Main, "llvm_start_edge_profiling", Counters);
|
|
return true;
|
|
}
|
|
|