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//===-- Method.cpp - Implement the Method class ------------------*- C++ -*--=//
//
// This file implements the Method class for the VMCore library.
//
//===----------------------------------------------------------------------===//
#include "llvm/ValueHolderImpl.h"
#include "llvm/DerivedTypes.h"
#include "llvm/SymbolTable.h"
#include "llvm/Module.h"
#include "llvm/Method.h"
#include "llvm/BasicBlock.h"
#include "llvm/iOther.h"
// Instantiate Templates - This ugliness is the price we have to pay
// for having a ValueHolderImpl.h file seperate from ValueHolder.h! :(
//
template class ValueHolder<MethodArgument, Method>;
template class ValueHolder<BasicBlock , Method>;
Method::Method(const MethodType *Ty, const string &name)
: SymTabValue(Ty, Value::MethodVal, name), BasicBlocks(this),
ArgumentList(this, this) {
assert(Ty->isMethodType() && "Method signature must be of method type!");
Parent = 0;
}
Method::~Method() {
dropAllReferences(); // After this it is safe to delete instructions.
// TODO: Should remove from the end, not the beginning of vector!
BasicBlocksType::iterator BI = BasicBlocks.begin();
while ((BI = BasicBlocks.begin()) != BasicBlocks.end())
delete BasicBlocks.remove(BI);
// Delete all of the method arguments and unlink from symbol table...
ArgumentList.delete_all();
ArgumentList.setParent(0);
}
// Specialize setName to take care of symbol table majik
void Method::setName(const string &name) {
Module *P;
if ((P = getParent()) && hasName()) P->getSymbolTable()->remove(this);
Value::setName(name);
if (P && getName() != "") P->getSymbolTableSure()->insert(this);
}
void Method::setParent(Module *parent) {
Parent = parent;
// Relink symbol tables together...
setParentSymTab(Parent ? Parent->getSymbolTableSure() : 0);
}
const Type *Method::getReturnType() const {
return ((const MethodType *)getType())->getReturnType();
}
const MethodType *Method::getMethodType() const {
return (const MethodType *)getType();
}
// dropAllReferences() - This function causes all the subinstructions to "let
// go" of all references that they are maintaining. This allows one to
// 'delete' a whole class at a time, even though there may be circular
// references... first all references are dropped, and all use counts go to
// zero. Then everything is delete'd for real. Note that no operations are
// valid on an object that has "dropped all references", except operator
// delete.
//
void Method::dropAllReferences() {
for_each(BasicBlocks.begin(), BasicBlocks.end(),
std::mem_fun(&BasicBlock::dropAllReferences));
}
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