Add a function for profiling to run at shutdown. Unlike the existing API, this
can be used even when main() isn't present in the Module, but it means that you
don't get to read argv[].
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129163 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Instrumentation/ProfilingUtils.cpp b/lib/Transforms/Instrumentation/ProfilingUtils.cpp
index b57bbf6..26b01e8 100644
--- a/lib/Transforms/Instrumentation/ProfilingUtils.cpp
+++ b/lib/Transforms/Instrumentation/ProfilingUtils.cpp
@@ -121,8 +121,7 @@
Indices[0] = Constant::getNullValue(Type::getInt32Ty(Context));
Indices[1] = ConstantInt::get(Type::getInt32Ty(Context), CounterNum);
Constant *ElementPtr =
- ConstantExpr::getGetElementPtr(CounterArray, &Indices[0],
- Indices.size());
+ ConstantExpr::getGetElementPtr(CounterArray, &Indices[0], Indices.size());
// Load, increment and store the value back.
Value *OldVal = new LoadInst(ElementPtr, "OldFuncCounter", InsertPos);
@@ -131,3 +130,39 @@
"NewFuncCounter", InsertPos);
new StoreInst(NewVal, ElementPtr, InsertPos);
}
+
+void llvm::InsertProfilingShutdownCall(Function *Callee, Module *Mod) {
+ // llvm.global_dtors is an array of type { i32, void ()* }. Prepare those
+ // types.
+ const Type *GlobalDtorElems[2] = {
+ Type::getInt32Ty(Mod->getContext()),
+ FunctionType::get(Type::getVoidTy(Mod->getContext()), false)->getPointerTo()
+ };
+ const StructType *GlobalDtorElemTy =
+ StructType::get(Mod->getContext(), GlobalDtorElems, false);
+
+ // Construct the new element we'll be adding.
+ Constant *Elem[2] = {
+ ConstantInt::get(Type::getInt32Ty(Mod->getContext()), 65535),
+ ConstantExpr::getBitCast(Callee, GlobalDtorElems[1])
+ };
+
+ // If llvm.global_dtors exists, make a copy of the things in its list and
+ // delete it, to replace it with one that has a larger array type.
+ std::vector<Constant *> dtors;
+ if (GlobalVariable *GlobalDtors = Mod->getNamedGlobal("llvm.global_dtors")) {
+ ConstantArray *InitList =
+ cast<ConstantArray>(GlobalDtors->getInitializer());
+ for (unsigned i = 0, e = InitList->getType()->getNumElements(); i != e; ++i)
+ dtors.push_back(cast<Constant>(InitList->getOperand(i)));
+ GlobalDtors->eraseFromParent();
+ }
+
+ // Build up llvm.global_dtors with our new item in it.
+ GlobalVariable *GlobalDtors = new GlobalVariable(
+ *Mod, ArrayType::get(GlobalDtorElemTy, 1), false,
+ GlobalValue::AppendingLinkage, NULL, "llvm.global_dtors");
+ dtors.push_back(ConstantStruct::get(Mod->getContext(), Elem, 2, false));
+ GlobalDtors->setInitializer(ConstantArray::get(
+ cast<ArrayType>(GlobalDtors->getType()->getElementType()), dtors));
+}
diff --git a/lib/Transforms/Instrumentation/ProfilingUtils.h b/lib/Transforms/Instrumentation/ProfilingUtils.h
index a76e357..09b2217 100644
--- a/lib/Transforms/Instrumentation/ProfilingUtils.h
+++ b/lib/Transforms/Instrumentation/ProfilingUtils.h
@@ -18,9 +18,10 @@
#define PROFILINGUTILS_H
namespace llvm {
+ class BasicBlock;
class Function;
class GlobalValue;
- class BasicBlock;
+ class Module;
class PointerType;
void InsertProfilingInitCall(Function *MainFn, const char *FnName,
@@ -29,6 +30,7 @@
void IncrementCounterInBlock(BasicBlock *BB, unsigned CounterNum,
GlobalValue *CounterArray,
bool beginning = true);
+ void InsertProfilingShutdownCall(Function *Callee, Module *Mod);
}
#endif