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Rewrite block sorting and placment so that unreachable blocks are processed. (#1428)

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* Rewrite block sorting and placment so that unreachable blocks are processed.

* Use DFS instead of Kahn's algorithm for toposort as it makes it easier
to deal with loops.

* Remove unused code
This commit is contained in:
karliss 2019-04-06 22:37:49 +03:00 committed by Itay Cohen
parent ae35ac9d08
commit 0583b06191
2 changed files with 120 additions and 111 deletions
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211
src/widgets/GraphGridLayout.cpp
View File

@ -1,7 +1,9 @@
#include "GraphGridLayout.h"
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <stack>
// Vector functions
template<class T>
@ -16,96 +18,76 @@ GraphGridLayout::GraphGridLayout(GraphGridLayout::LayoutType layoutType)
{
}
std::vector<ut64> GraphGridLayout::topoSort(LayoutState &state, unsigned long long entry)
std::vector<ut64> GraphGridLayout::topoSort(LayoutState &state, ut64 entry)
{
auto &blocks = *state.blocks;
// Populate incoming lists
for (auto &blockIt : blocks) {
GraphBlock &block = blockIt.second;
for (auto &edge : block.edges) {
state.grid_blocks[edge.target].incoming.push_back(blockIt.first);
}
}
std::unordered_set<ut64> visited;
visited.insert(entry);
std::queue<ut64> queue;
std::vector<ut64> block_order;
queue.push(entry);
bool changed = true;
while (changed) {
changed = false;
// Pick nodes with single entrypoints
while (!queue.empty()) {
GraphBlock &block = blocks[queue.front()];
queue.pop();
block_order.push_back(block.entry);
for (const auto &edgeDescr : block.edges) {
ut64 edge = edgeDescr.target;
// Skip edge if we already visited it
if (visited.count(edge)) {
continue;
}
// Some edges might not be available
if (!blocks.count(edge)) {
continue;
}
// If this node has no other incoming edges, add it to the graph layout
if (state.grid_blocks[edge].incoming.size() == 1) {
removeFromVec(state.grid_blocks[edge].incoming, block.entry);
state.grid_blocks[block.entry].tree_edge.push_back(edge);
queue.push(blocks[edge].entry);
visited.insert(edge);
changed = true;
// Run DFS to:
// * select backwards/loop edges
// * perform toposort
std::vector<ut64> blockOrder;
// 0 - not visited
// 1 - in stack
// 2 - visited
std::unordered_map<ut64, uint8_t> visited;
visited.reserve(state.blocks->size());
std::stack<std::pair<ut64, size_t>> stack;
auto dfsFragment = [&visited, &blocks, &state, &stack, &blockOrder](ut64 first) {
visited[first] = 1;
stack.push({first, 0});
while (!stack.empty()) {
auto v = stack.top().first;
auto edge_index = stack.top().second;
const auto &block = blocks[v];
if (edge_index < block.edges.size()) {
++stack.top().second;
auto target = block.edges[edge_index].target;
auto &targetState = visited[target];
if (targetState == 0) {
targetState = 1;
stack.push({target, 0});
state.grid_blocks[v].dag_edge.push_back(target);
} else if (targetState == 2) {
state.grid_blocks[v].dag_edge.push_back(target);
} // else { targetState == 1 in stack, loop edge }
} else {
// Remove from incoming edges
removeFromVec(state.grid_blocks[edge].incoming, block.entry);
stack.pop();
visited[v] = 2;
blockOrder.push_back(v);
}
}
};
// Start with entry so that if start of function block is part of loop it
// is still kept at top unless it's impossible to do while maintaining
// topological order.
dfsFragment(entry);
for (auto &blockIt : blocks) {
if (!visited[blockIt.first]) {
dfsFragment(blockIt.first);
}
}
// No more nodes satisfy constraints, pick a node to continue constructing the graph
ut64 best = 0;
int best_edges;
ut64 best_parent = 0;
for (auto &blockIt : blocks) {
GraphBlock &block = blockIt.second;
// Skip blocks we haven't visited yet
if (!visited.count(block.entry)) {
continue;
// assign levels and select tree edges
for (auto it = blockOrder.rbegin(), end = blockOrder.rend(); it != end; it++) {
auto &block = state.grid_blocks[*it];
int nextLevel = block.level + 1;
for (auto target : block.dag_edge) {
auto &targetBlock = state.grid_blocks[target];
targetBlock.level = std::max(targetBlock.level, nextLevel);
}
for (const auto &edgeDescr : block.edges) {
ut64 edge = edgeDescr.target;
// If we already visited the exit, skip it
if (visited.count(edge)) {
continue;
}
if (!blocks.count(edge)) {
continue;
}
// find best edge
if ((best == 0) || ((int)state.grid_blocks[edge].incoming.size() < best_edges) || (
((int)state.grid_blocks[edge].incoming.size() == best_edges) && (edge < best))) {
best = edge;
best_edges = state.grid_blocks[edge].incoming.size();
best_parent = block.entry;
for (auto &blockIt : state.grid_blocks) {
auto &block = blockIt.second;
for (auto targetId : block.dag_edge) {
auto &targetBlock = state.grid_blocks[targetId];
if (!targetBlock.has_parent && targetBlock.level == block.level + 1) {
block.tree_edge.push_back(targetId);
targetBlock.has_parent = true;
}
}
}
if (best != 0) {
auto &best_parentb = state.grid_blocks[best_parent];
removeFromVec(state.grid_blocks[best].incoming, best_parent);
best_parentb.tree_edge.push_back(best);
visited.insert(best);
queue.push(best);
changed = true;
}
}
return block_order;
return blockOrder;
}
void GraphGridLayout::CalculateLayout(std::unordered_map<ut64, GraphBlock> &blocks, ut64 entry,
@ -121,23 +103,32 @@ void GraphGridLayout::CalculateLayout(std::unordered_map<ut64, GraphBlock> &bloc
}
auto block_order = topoSort(layoutState, entry);
computeBlockPlacement(entry, layoutState);
computeAllBlockPlacement(block_order, layoutState);
for (auto &blockIt : blocks) {
layoutState.edge[blockIt.first].resize(blockIt.second.edges.size());
}
// Prepare edge routing
auto &entryb = layoutState.grid_blocks[entry];
//auto &entryb = layoutState.grid_blocks[entry];
int col_count = 1;
int row_count = 0;
for (const auto &blockIt : layoutState.grid_blocks) {
if (!blockIt.second.has_parent) {
row_count = std::max(row_count, blockIt.second.row_count);
col_count += blockIt.second.col_count;
}
}
row_count += 2;
EdgesVector horiz_edges, vert_edges;
horiz_edges.resize(entryb.row_count + 1);
vert_edges.resize(entryb.row_count + 1);
horiz_edges.resize(row_count + 1);
vert_edges.resize(row_count + 1);
Matrix<bool> edge_valid;
edge_valid.resize(entryb.row_count + 1);
for (int row = 0; row < entryb.row_count + 1; row++) {
horiz_edges[row].resize(entryb.col_count + 1);
vert_edges[row].resize(entryb.col_count + 1);
edge_valid[row].assign(entryb.col_count + 1, true);
edge_valid.resize(row_count + 1);
for (int row = 0; row < row_count + 1; row++) {
horiz_edges[row].resize(col_count + 1);
vert_edges[row].resize(col_count + 1);
edge_valid[row].assign(col_count + 1, true);
}
for (auto &blockIt : layoutState.grid_blocks) {
@ -158,10 +149,10 @@ void GraphGridLayout::CalculateLayout(std::unordered_map<ut64, GraphBlock> &bloc
// Compute edge counts for each row and column
std::vector<int> col_edge_count, row_edge_count;
col_edge_count.assign(entryb.col_count + 1, 0);
row_edge_count.assign(entryb.row_count + 1, 0);
for (int row = 0; row < entryb.row_count + 1; row++) {
for (int col = 0; col < entryb.col_count + 1; col++) {
col_edge_count.assign(col_count + 1, 0);
row_edge_count.assign(row_count + 1, 0);
for (int row = 0; row < row_count + 1; row++) {
for (int col = 0; col < col_count + 1; col++) {
if (int(horiz_edges[row][col].size()) > row_edge_count[row])
row_edge_count[row] = int(horiz_edges[row][col].size());
if (int(vert_edges[row][col].size()) > col_edge_count[col])
@ -172,8 +163,8 @@ void GraphGridLayout::CalculateLayout(std::unordered_map<ut64, GraphBlock> &bloc
//Compute row and column sizes
std::vector<int> col_width, row_height;
col_width.assign(entryb.col_count + 1, 0);
row_height.assign(entryb.row_count + 1, 0);
col_width.assign(col_count + 1, 0);
row_height.assign(row_count + 1, 0);
for (auto &blockIt : blocks) {
GraphBlock &block = blockIt.second;
GridBlock &grid_block = layoutState.grid_blocks[blockIt.first];
@ -187,19 +178,19 @@ void GraphGridLayout::CalculateLayout(std::unordered_map<ut64, GraphBlock> &bloc
// Compute row and column positions
std::vector<int> col_x, row_y;
col_x.assign(entryb.col_count, 0);
row_y.assign(entryb.row_count, 0);
std::vector<int> col_edge_x(entryb.col_count + 1);
std::vector<int> row_edge_y(entryb.row_count + 1);
col_x.assign(col_count, 0);
row_y.assign(row_count, 0);
std::vector<int> col_edge_x(col_count + 1);
std::vector<int> row_edge_y(row_count + 1);
int x = layoutConfig.block_horizontal_margin * 2;
for (int i = 0; i < entryb.col_count; i++) {
for (int i = 0; i < col_count; i++) {
col_edge_x[i] = x;
x += layoutConfig.block_horizontal_margin * col_edge_count[i];
col_x[i] = x;
x += col_width[i];
}
int y = layoutConfig.block_vertical_margin * 2;
for (int i = 0; i < entryb.row_count; i++) {
for (int i = 0; i < row_count; i++) {
row_edge_y[i] = y;
// TODO: The 1 when row_edge_count is 0 is not needed on the original.. not sure why it's required for us
if (!row_edge_count[i]) {
@ -209,12 +200,12 @@ void GraphGridLayout::CalculateLayout(std::unordered_map<ut64, GraphBlock> &bloc
row_y[i] = y;
y += row_height[i];
}
col_edge_x[entryb.col_count] = x;
row_edge_y[entryb.row_count] = y;
col_edge_x[col_count] = x;
row_edge_y[row_count] = y;
width = x + (layoutConfig.block_horizontal_margin * 2) + (layoutConfig.block_horizontal_margin *
col_edge_count[entryb.col_count]);
col_edge_count[col_count]);
height = y + (layoutConfig.block_vertical_margin * 2) + (layoutConfig.block_vertical_margin *
row_edge_count[entryb.row_count]);
row_edge_count[row_count]);
//Compute node positions
for (auto &blockIt : blocks) {
@ -285,10 +276,23 @@ void GraphGridLayout::CalculateLayout(std::unordered_map<ut64, GraphBlock> &bloc
}
}
void GraphGridLayout::computeAllBlockPlacement(const std::vector<ut64> &blockOrder,
LayoutState &layoutState) const
{
for (auto blockId : blockOrder) {
computeBlockPlacement(blockId, layoutState);
}
int col = 0;
for (auto blockId : blockOrder) {
if (!layoutState.grid_blocks[blockId].has_parent) {
adjustGraphLayout(layoutState.grid_blocks[blockId], layoutState.grid_blocks, col, 1);
col += layoutState.grid_blocks[blockId].col_count;
}
}
}
// Prepare graph
// This computes the position and (row/col based) size of the block
// Recursively calls itself for each child of the GraphBlock
void GraphGridLayout::computeBlockPlacement(ut64 blockId, LayoutState &layoutState) const
{
auto &block = layoutState.grid_blocks[blockId];
@ -301,7 +305,6 @@ void GraphGridLayout::computeBlockPlacement(ut64 blockId, LayoutState &layoutSta
for (size_t i = 0; i < block.tree_edge.size(); i++) {
ut64 edge = block.tree_edge[i];
auto &edgeb = blocks[edge];
computeBlockPlacement(edge, layoutState);
row_count = std::max(edgeb.row_count + 1, row_count);
childColumn = edgeb.col;
}

10
src/widgets/GraphGridLayout.h
View File

@ -23,8 +23,10 @@ private:
struct GridBlock {
ut64 id;
std::vector<ut64> incoming;
std::vector<ut64> tree_edge; // subset of outgoing edges that form a tree
std::vector<ut64> dag_edge; // subset of outgoing edges that form a tree
std::size_t has_parent = false;
int level = 0;
// Number of rows in block
int row_count = 0;
@ -63,9 +65,13 @@ private:
std::unordered_map<ut64, std::vector<GridEdge>> edge;
};
using GridBlockMap = std::unordered_map<ut64, GridBlock>;
void computeAllBlockPlacement(const std::vector<ut64> &blockOrder,
LayoutState &layoutState) const;
void computeBlockPlacement(ut64 blockId,
LayoutState &layoutState) const;
void adjustGraphLayout(GridBlock &block, std::unordered_map<ut64, GridBlock> &blocks,
void adjustGraphLayout(GridBlock &block, GridBlockMap &blocks,
int col, int row) const;
static std::vector<ut64> topoSort(LayoutState &state, ut64 entry);