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92 lines
3.3 KiB
C++
92 lines
3.3 KiB
C++
//===- trie-node.h - XRay Call Stack Data Structure -----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides a data structure and routines for working with call stacks
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// of instrumented functions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_XRAY_STACK_TRIE_H
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#define LLVM_TOOLS_LLVM_XRAY_STACK_TRIE_H
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#include <forward_list>
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#include <numeric>
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallVector.h"
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/// A type to represent a trie of invocations. It is useful to construct a
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/// graph of these nodes from reading an XRay trace, such that each function
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/// call can be placed in a larger context.
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///
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/// The template parameter allows users of the template to attach their own
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/// data elements to each node in the invocation graph.
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template <typename AssociatedData> struct TrieNode {
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/// The function ID.
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int32_t FuncId;
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/// The caller of this function.
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TrieNode<AssociatedData> *Parent;
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/// The callees from this function.
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llvm::SmallVector<TrieNode<AssociatedData> *, 4> Callees;
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/// Additional parameterized data on each node.
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AssociatedData ExtraData;
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};
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/// Merges together two TrieNodes with like function ids, aggregating their
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/// callee lists and durations. The caller must provide storage where new merged
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/// nodes can be allocated in the form of a linked list.
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template <typename T, typename Callable>
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TrieNode<T> *
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mergeTrieNodes(const TrieNode<T> &Left, const TrieNode<T> &Right,
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/*Non-deduced pointer type for nullptr compatibility*/
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typename std::remove_reference<TrieNode<T> *>::type NewParent,
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std::forward_list<TrieNode<T>> &NodeStore,
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Callable &&MergeCallable) {
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llvm::function_ref<T(const T &, const T &)> MergeFn(
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std::forward<Callable>(MergeCallable));
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assert(Left.FuncId == Right.FuncId);
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NodeStore.push_front(TrieNode<T>{
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Left.FuncId, NewParent, {}, MergeFn(Left.ExtraData, Right.ExtraData)});
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auto I = NodeStore.begin();
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auto *Node = &*I;
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// Build a map of callees from the left side.
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llvm::DenseMap<int32_t, TrieNode<T> *> LeftCalleesByFuncId;
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for (auto *Callee : Left.Callees) {
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LeftCalleesByFuncId[Callee->FuncId] = Callee;
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}
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// Iterate through the right side, either merging with the map values or
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// directly adding to the Callees vector. The iteration also removes any
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// merged values from the left side map.
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// TODO: Unroll into iterative and explicit stack for efficiency.
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for (auto *Callee : Right.Callees) {
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auto iter = LeftCalleesByFuncId.find(Callee->FuncId);
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if (iter != LeftCalleesByFuncId.end()) {
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Node->Callees.push_back(
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mergeTrieNodes(*(iter->second), *Callee, Node, NodeStore, MergeFn));
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LeftCalleesByFuncId.erase(iter);
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} else {
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Node->Callees.push_back(Callee);
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}
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}
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// Add any callees that weren't found in the right side.
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for (auto MapPairIter : LeftCalleesByFuncId) {
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Node->Callees.push_back(MapPairIter.second);
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}
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return Node;
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}
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#endif // LLVM_TOOLS_LLVM_XRAY_STACK_TRIE_H
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