The BUILD.gn is setup with small source units for various components in Tint. The hierarchy of sources almost matches to folder structure in tint (except for base which is a mix of things in src/tint and src/tint/util.
+-----------------------------------------+
| Readers | Writers |
+-----------------------------------------+
|
V
+-----------------------------------------+
| Val | Inspector | Transform |
+-----------------------------------------+
| |
+--------------+------------------------------+
| |
V V
+-----------------------------------------+ +-----------+
| AST | | Utils IO |
+-----------------------------------------+ +-----------+
| |
V |
+-----------------------------------------+ |
| Program | Sem | |
+-----------------------------------------+ |
| |
V |
+-----------------------------------------+ |
| AST Hdrs | |
| (program and sem cause a cycle) | |
+-----------------------------------------+ |
| |
V |
+-----------------------------------------+ |
| Clone Context Hdrs | |
| (program and sem cause a cycle) | |
+-----------------------------------------+ |
| |
V |
+-----------------------------------------+ |
| Constant | |
+-----------------------------------------+ |
| |
V |
+-----------------------------------------+ |
| Types | |
+-----------------------------------------+ |
| |
V |
+-----------------------------------------+ |
| Builtin | |
+-----------------------------------------+ |
| |
|------------------------------+
V
+-----------------------------------------+
| Symbols |
+-----------------------------------------+
|
V
+-----------------------------------------+ +-------------+
| Utils | | Initializer |
+-----------------------------------------+ +-------------+