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//===-- cache_frag.cpp ----------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of EfficiencySanitizer, a family of performance tuners.
//
// This file contains cache fragmentation-specific code.
//===----------------------------------------------------------------------===//
#include "esan.h"
#include "sanitizer_common/sanitizer_addrhashmap.h"
#include "sanitizer_common/sanitizer_placement_new.h"
namespace __esan {
//===-- Struct field access counter runtime -------------------------------===//
// This should be kept consistent with LLVM's EfficiencySanitizer StructInfo.
struct StructInfo {
const char *StructName;
u32 NumFields;
u64 *FieldCounters;
const char **FieldTypeNames;
};
// This should be kept consistent with LLVM's EfficiencySanitizer CacheFragInfo.
// The tool-specific information per compilation unit (module).
struct CacheFragInfo {
const char *UnitName;
u32 NumStructs;
StructInfo *Structs;
};
struct StructCounter {
StructInfo *Struct;
u64 Count; // The total access count of the struct.
u32 Variance; // Variance score for the struct layout access.
};
// We use StructHashMap to keep track of an unique copy of StructCounter.
typedef AddrHashMap<StructCounter, 31051> StructHashMap;
struct Context {
StructHashMap StructMap;
u32 NumStructs;
u64 TotalCount; // The total access count of all structs.
};
static Context *Ctx;
static void registerStructInfo(CacheFragInfo *CacheFrag) {
for (u32 i = 0; i < CacheFrag->NumStructs; ++i) {
StructInfo *Struct = &CacheFrag->Structs[i];
StructHashMap::Handle H(&Ctx->StructMap, (uptr)Struct->FieldCounters);
if (H.created()) {
VPrintf(2, " Register %s: %u fields\n",
Struct->StructName, Struct->NumFields);
H->Struct = Struct;
++Ctx->NumStructs;
} else {
VPrintf(2, " Duplicated %s: %u fields\n",
Struct->StructName, Struct->NumFields);
}
}
}
static void unregisterStructInfo(CacheFragInfo *CacheFrag) {
// FIXME: if the library is unloaded before finalizeCacheFrag, we should
// collect the result for later report.
for (u32 i = 0; i < CacheFrag->NumStructs; ++i) {
StructInfo *Struct = &CacheFrag->Structs[i];
StructHashMap::Handle H(&Ctx->StructMap, (uptr)Struct->FieldCounters, true);
if (H.exists()) {
VPrintf(2, " Unregister %s: %u fields\n",
Struct->StructName, Struct->NumFields);
--Ctx->NumStructs;
} else {
VPrintf(2, " Duplicated %s: %u fields\n",
Struct->StructName, Struct->NumFields);
}
}
}
static void reportStructSummary() {
// FIXME: iterate StructHashMap and generate the final report.
Report("%s is not finished: nothing yet to report\n", SanitizerToolName);
}
//===-- Init/exit functions -----------------------------------------------===//
void processCacheFragCompilationUnitInit(void *Ptr) {
CacheFragInfo *CacheFrag = (CacheFragInfo *)Ptr;
VPrintf(2, "in esan::%s: %s with %u class(es)/struct(s)\n",
__FUNCTION__, CacheFrag->UnitName, CacheFrag->NumStructs);
registerStructInfo(CacheFrag);
}
void processCacheFragCompilationUnitExit(void *Ptr) {
CacheFragInfo *CacheFrag = (CacheFragInfo *)Ptr;
VPrintf(2, "in esan::%s: %s with %u class(es)/struct(s)\n",
__FUNCTION__, CacheFrag->UnitName, CacheFrag->NumStructs);
unregisterStructInfo(CacheFrag);
}
void initializeCacheFrag() {
VPrintf(2, "in esan::%s\n", __FUNCTION__);
// We use placement new to initialize Ctx before C++ static initializaion.
// We make CtxMem 8-byte aligned for atomic operations in AddrHashMap.
static u64 CtxMem[sizeof(Context) / sizeof(u64) + 1];
Ctx = new(CtxMem) Context();
Ctx->NumStructs = 0;
}
int finalizeCacheFrag() {
VPrintf(2, "in esan::%s\n", __FUNCTION__);
reportStructSummary();
return 0;
}
} // namespace __esan
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