Implemented optimize()

1 files changed, 30 insertions, 1 deletions

diff --git a/asm/segment.cpp b/asm/segment.cpp
index a4544f2..d3050bb 100644
--- a/asm/segment.cpp
+++ b/asm/segment.cpp
@@ -79,6 +79,35 @@ void Segment::insertAddresses()
 
 void Segment::optimize()
 {
- // TODO
+ bool changed{false};
+
+ for (size_t i = 0; i < this->size(); i++) {
+  try {
+   AddressFeature& af { dynamic_cast<AddressFeature&>(*((*this)[i]))};
+
+   if (af.relativeAddressing == false)
+    throw std::runtime_error("Error: Absolute Addressing not supported.");
+
+   if (!af.alternative_code.empty()) {
+    int64_t target_address = getAddressOfLabel(af.label); // throws if label not found
+    int64_t start_address = getAddressOfIndex(i); // throws if out of range
+    int64_t diff = target_address - start_address;
+    if (af.addr_size == 4 && af.alternative_size == 1 && diff >= -128 && diff <= 127) {
+     af.machine_code = af.alternative_code;
+     af.addr_size = af.alternative_size;
+     af.addr_offs = af.alternative_offs;
+     af.alternative_code.clear();
+     af.alternative_size = 0;
+     af.alternative_offs = 0;
+     changed = true;
+    }
+   }
+  } catch (const std::bad_cast& ex) {
+   // ignore, expected for non-addressing chunks
+  }
+ }
+
+ if (changed)
+  insertAddresses(); // renumber
 }