# Dex Symbols
Dex symbols are those with a `section` of:
* `.dex.method` (Java methods)
* `.dex` (All other forms of dex size. E.g. Class descriptors)
## Algorithm
**During builds:**
* Java compile targets create a mapping between Java fully qualified names
(FQN) and source files.
* For `.java` files the FQN of the public class is mapped to the file.
* For `.srcjar` files the FQN of the public class is mapped to the `.srcjar`
file path.
* A complete per-apk class FQN to source mapping is stored in the
`$output_dir/size-info` dir.
**During `supersize archive`:**
1. `$ANDROID_SDK/cmdline-tools/apkanalyzer dex packages` is used to find the
size and FQN of entries in across all dex files.
* One symbol is created for each method and class entry in the output.
2. Source paths are added to symbols using the mapping from
`$output_dir/Foo.apk.jar.info`