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//===- LibCallSemantics.cpp - Describe library semantics ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements interfaces that can be used to describe language
// specific runtime library interfaces (e.g. libc, libm, etc) to LLVM
// optimizers.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/LibCallSemantics.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Function.h"
using namespace llvm;
/// getMap - This impl pointer in ~LibCallInfo is actually a StringMap. This
/// helper does the cast.
static StringMap<const LibCallFunctionInfo*> *getMap(void *Ptr) {
return static_cast<StringMap<const LibCallFunctionInfo*> *>(Ptr);
}
LibCallInfo::~LibCallInfo() {
delete getMap(Impl);
}
const LibCallLocationInfo &LibCallInfo::getLocationInfo(unsigned LocID) const {
// Get location info on the first call.
if (NumLocations == 0)
NumLocations = getLocationInfo(Locations);
assert(LocID < NumLocations && "Invalid location ID!");
return Locations[LocID];
}
/// getFunctionInfo - Return the LibCallFunctionInfo object corresponding to
/// the specified function if we have it. If not, return null.
const LibCallFunctionInfo *LibCallInfo::getFunctionInfo(Function *F) const {
StringMap<const LibCallFunctionInfo*> *Map = getMap(Impl);
/// If this is the first time we are querying for this info, lazily construct
/// the StringMap to index it.
if (Map == 0) {
Impl = Map = new StringMap<const LibCallFunctionInfo*>();
const LibCallFunctionInfo *Array = getFunctionInfoArray();
if (Array == 0) return 0;
// We now have the array of entries. Populate the StringMap.
for (unsigned i = 0; Array[i].Name; ++i)
(*Map)[Array[i].Name] = Array+i;
}
// Look up this function in the string map.
const char *ValueName = F->getNameStart();
StringMap<const LibCallFunctionInfo*>::iterator I =
Map->find(StringRef(ValueName, F->getNameLen()));
return I != Map->end() ? I->second : 0;
}
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