COMPMID-793 : Add graph intermediate representation

Change-Id: Ic1685de4e19e0ac79669ef2da64e1dc96c7ea0bf
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/115248
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/src/graph2/printers/DotGraphPrinter.cpp b/src/graph2/printers/DotGraphPrinter.cpp
new file mode 100644
index 0000000..04987ee
--- /dev/null
+++ b/src/graph2/printers/DotGraphPrinter.cpp
@@ -0,0 +1,173 @@
+/*
+ * Copyright (c) 2018 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "arm_compute/graph2/printers/DotGraphPrinter.h"
+
+#include "arm_compute/core/Error.h"
+#include "arm_compute/graph2/Graph.h"
+#include "arm_compute/graph2/Tensor.h"
+#include "arm_compute/graph2/TypePrinter.h"
+#include "arm_compute/graph2/nodes/Nodes.h"
+
+namespace arm_compute
+{
+namespace graph2
+{
+void DotGraphVisitor::visit(ActivationLayerNode &n)
+{
+    std::stringstream ss;
+    ss << n.activation_info().activation();
+    _info = ss.str();
+}
+
+void DotGraphVisitor::visit(BatchNormalizationLayerNode &n)
+{
+    std::stringstream ss;
+    ss << (n.fused_activation().enabled() ? to_string(n.fused_activation().activation()) : "");
+    _info = ss.str();
+}
+
+void DotGraphVisitor::visit(ConvolutionLayerNode &n)
+{
+    std::stringstream ss;
+    ss << n.convolution_method();
+    _info = ss.str();
+}
+
+void DotGraphVisitor::visit(DepthConcatenateLayerNode &n)
+{
+    std::stringstream ss;
+    ss << "Enabled: " << n.is_enabled();
+    _info = ss.str();
+}
+
+void DotGraphVisitor::visit(DepthwiseConvolutionLayerNode &n)
+{
+    std::stringstream ss;
+    ss << n.depthwise_convolution_method();
+    _info = ss.str();
+}
+
+void DotGraphVisitor::visit(EltwiseLayerNode &n)
+{
+    std::stringstream ss;
+    ss << n.eltwise_operation();
+    _info = ss.str();
+}
+
+void DotGraphVisitor::visit(NormalizationLayerNode &n)
+{
+    std::stringstream ss;
+    ss << n.normalization_info().type();
+    _info = ss.str();
+}
+
+void DotGraphVisitor::visit(PoolingLayerNode &n)
+{
+    std::stringstream ss;
+    ss << n.pooling_info().pool_type();
+    ss << R"( \n )";
+    ss << n.pooling_info().pool_size();
+    ss << R"( \n )";
+    ss << n.pooling_info().pad_stride_info();
+    _info = ss.str();
+}
+
+void DotGraphVisitor::default_visit()
+{
+    _info.clear();
+}
+
+const std::string &DotGraphVisitor::info() const
+{
+    return _info;
+}
+
+void DotGraphPrinter::print(const Graph &g, std::ostream &os)
+{
+    // Print header
+    print_header(g, os);
+
+    // Print nodes
+    print_nodes(g, os);
+
+    // Print edges
+    print_edges(g, os);
+
+    // Print footer
+    print_footer(g, os);
+}
+
+void DotGraphPrinter::print_header(const Graph &g, std::ostream &os)
+{
+    // Print graph name
+    std::string graph_name = (g.name().empty()) ? "Graph" : g.name();
+    os << "digraph " << graph_name << "{\n";
+}
+
+void DotGraphPrinter::print_footer(const Graph &g, std::ostream &os)
+{
+    ARM_COMPUTE_UNUSED(g);
+    os << "}\n";
+}
+
+void DotGraphPrinter::print_nodes(const Graph &g, std::ostream &os)
+{
+    for(const auto &n : g.nodes())
+    {
+        if(n)
+        {
+            // Output node id
+            std::string node_id = std::string("n") + support::cpp11::to_string(n->id());
+            os << node_id << " ";
+
+            // Output label
+            n->accept(_dot_node_visitor);
+
+            std::string name             = n->name().empty() ? node_id : n->name();
+            auto        node_description = _dot_node_visitor.info();
+
+            os << R"([label = ")" << name << R"( \n )" << n->assigned_target() << R"( \n )" << node_description << R"("])";
+            os << ";\n";
+        }
+    }
+}
+
+void DotGraphPrinter::print_edges(const Graph &g, std::ostream &os)
+{
+    for(const auto &e : g.edges())
+    {
+        if(e)
+        {
+            std::string source_node_id = std::string("n") + support::cpp11::to_string(e->producer_id());
+            std::string sink_node_id   = std::string("n") + support::cpp11::to_string(e->consumer_id());
+            os << source_node_id << " -> " << sink_node_id << " ";
+            const Tensor *t = e->tensor();
+            ARM_COMPUTE_ERROR_ON(t == nullptr);
+            os << R"([label = ")" << t->desc().shape << R"( \n )" << t->desc().data_type << R"("])";
+            os << ";\n";
+        }
+    }
+}
+} // namespace graph2
+} // namespace arm_compute