Rewrite assembler

This is an almost complete rewrite of the entire assembler from the
ground up, with a different parsing strategy and a whole new symbol
resolution mechanism for automatically including library files.

The assembly syntax has also been slightly modified, with padding
tokens now being prefixed with '#' instead of '$', and a block-style
anonymous-label syntax which uses the '{' and '}' characters.

1 files changed, 39 insertions, 0 deletions

diff --git a/src/locators/bytecode.rs b/src/locators/bytecode.rs
new file mode 100644
index 0000000..500e9f0
--- /dev/null
+++ b/src/locators/bytecode.rs
@@ -0,0 +1,39 @@
+pub struct BytecodeSpan {
+    /// The location of this span in the assembled bytecode.
+    pub location: BytecodeLocation,
+    /// The bytes which this span represents.
+    pub bytes: Vec<u8>,
+}
+
+
+impl Default for BytecodeSpan {
+    fn default() -> Self {
+        Self {
+            location: BytecodeLocation {
+                address: 0,
+                length: 0,
+            },
+            bytes: Vec::new(),
+        }
+    }
+}
+
+
+#[derive(Clone, Copy)]
+pub struct BytecodeLocation {
+    // Address of the first byte.
+    pub address: usize,
+    // Length as a number of bytes.
+    pub length: usize,
+}
+
+
+impl std::fmt::Display for BytecodeLocation {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+        write!(f, "0x{:>04x}", self.address)?;
+        if self.length > 0 {
+            write!(f, "-0x{:>04x}", self.address + self.length)?;
+        }
+        Ok(())
+    }
+}