From 1ac8ab06e9aad3b6d22685255459d71cb49e1f28 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Mon, 9 Nov 2020 09:50:58 +0100
Subject: First program: Can add 2 integers and return result via exit code

---
 asm/encode.cpp | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

(limited to 'asm/encode.cpp')

diff --git a/asm/encode.cpp b/asm/encode.cpp
index ea50cb7..8bf33c0 100644
--- a/asm/encode.cpp
+++ b/asm/encode.cpp
@@ -1,6 +1,68 @@
+// Intel specific conversion: Abstract Graph -> Machine specific segment
 #include "encode.h"
 
+#include "asm/assembler.h"
+#include "minicc.h"
+
+#include <boost/endian/conversion.hpp>
+
+#include <exception>
+
 void Asm::toMachineCode(const FlowGraph::Graph& graph, Segment& segment)
 {
+ segment.clear();
+
+ for (const std::shared_ptr<FlowGraph::Node>& node: graph) {
+  try {
+   FlowGraph::BinaryOperation& op {dynamic_cast<FlowGraph::BinaryOperation&>(*node)};
+
+   auto operands {op.operands()};
+   // TODO: ignore destination (0) for now
+
+   if (operands[1].type() != FlowGraph::DataType::Int) {
+    std::runtime_error("Bad type for operand 1: "s + std::to_string(int(operands[1].type())));
+   }
+
+   if (operands[2].type() != FlowGraph::DataType::Int) {
+    std::runtime_error("Bad type for operand 2: "s + std::to_string(int(operands[2].type())));
+   }
+
+   if (!operands[1].storage())
+    throw std::runtime_error("ICE: Operand 1 storage is 0");
+   if (!operands[2].storage())
+    throw std::runtime_error("ICE: Operand 2 storage is 0");
+
+   uint32_t immediate1{};
+   try {
+    FlowGraph::Constant& value1 {dynamic_cast<FlowGraph::Constant&>(*operands[1].storage())};
+    if (value1.value().size() < sizeof(uint32_t))
+     throw std::runtime_error("ICE: Int data from operand 1 needs at least 4 bytes, got "s + std::to_string(value1.value().size()));
+
+    immediate1 = boost::endian::little_to_native(*(reinterpret_cast<const uint32_t*>(value1.value().data())));
+   } catch (const std::bad_cast& ex) {
+    std::runtime_error("Bad value for operand 1: Constant expected");
+   }
+   
+   uint32_t immediate2{};
+   try {
+    FlowGraph::Constant& value2 {dynamic_cast<FlowGraph::Constant&>(*operands[2].storage())};
+    if (value2.value().size() < sizeof(uint32_t))
+     throw std::runtime_error("ICE: Int data from operand 2 needs at least 4 bytes, got "s + std::to_string(value2.value().size()));
+
+    immediate2 = boost::endian::little_to_native(*(reinterpret_cast<const uint32_t*>(value2.value().data())));
+   } catch (const std::bad_cast& ex) {
+    std::runtime_error("Bad value for operand 2: Constant expected");
+   }
+
+   Asm::Args args1{{Asm::Args::Register32("edi"), Asm::Args::Immediate32(immediate1)}};
+   segment.push_back(makeOp("mov", args1));
+   
+   Asm::Args args2{{Asm::Args::Register32("edi"), Asm::Args::Immediate32(immediate2)}};
+   segment.push_back(makeOp("add", args2));
+
+  } catch (const std::bad_cast& ex) {
+   std::runtime_error("ICE: Encoding: Unsupported node: "s + ex.what());
+  }
+ }
 }
 
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