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//===-- gen/variable_lifetime.h - -------------------------------*- C++ -*-===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
//
// Codegen for local variable lifetime: llvm.lifetime.start abd
// llvm.lifetime.end.
//
//===----------------------------------------------------------------------===//
#pragma once
#include <vector>
#include <utility>
namespace llvm {
class Function;
class Type;
class Value;
}
struct IRState;
struct LocalVariableLifetimeAnnotator {
struct LocalVariableScope {
std::vector<std::pair<llvm::Value *, llvm::Value *>> variables;
};
/// Stack of scopes, each scope can have multiple variables.
std::vector<LocalVariableScope> scopes;
/// Cache the llvm types and intrinsics used for codegen.
llvm::Function *lifetimeStartFunction = nullptr;
llvm::Function *lifetimeEndFunction = nullptr;
llvm::Type *allocaType = nullptr;
llvm::Function *getLLVMLifetimeStartFn();
llvm::Function *getLLVMLifetimeEndFn();
IRState &irs;
public:
LocalVariableLifetimeAnnotator(IRState &irs);
/// Opens a new scope.
void pushScope();
/// Closes current scope and emits end-of-lifetime annotation for all
/// variables in current scope.
void popScope();
/// Register a new local variable for lifetime annotation.
void addLocalVariable(llvm::Value *address, llvm::Value *size);
};
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