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Diffstat (limited to 'chapter28b/README.md')
| -rw-r--r-- | chapter28b/README.md | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/chapter28b/README.md b/chapter28b/README.md index f464fed4..0a7baa68 100644 --- a/chapter28b/README.md +++ b/chapter28b/README.md @@ -116,10 +116,18 @@ normal inlining heuristics. The combined graph goes through the normal compilation phases, including peepholes, Opto and TypeCheck. Dependencies between `CompUnit`s are recorded. An explicitly requested source -file is always compiled. Other source files are recompiled if their object is -missing, their source is newer, or a recorded dependency's object in the build -directory is newer. These timestamp checks are not yet a complete incremental -build system, there is some modest future work needed to finish this. +file is always compiled. Before reusing another local object, `CompUnit` walks +its recorded dependencies and checks every source bundled into each local +object. A missing input or a newer source or dependency object forces parsing +again, before saved types or IR are imported. This includes transitive +dependencies: if A has inlined B, editing B's source invalidates A even while +B's object is unchanged. A visited set lets this check follow cycles. + +Library dependencies use the same search paths for checking and loading. +Object-only libraries must be supplied as a coherent build; timestamps alone +cannot establish their compatibility. These checks are not a complete build +driver: explicit requests still compile, and input hashes, compiler/ABI +versions, and automatic relinking remain future work. Loading currently works at the object granularity. Unrelated objects can stay unloaded, but selecting an object loads its entire saved graph and follows its @@ -163,6 +171,9 @@ constructors, initialization cycles across objects, shared static data, native function thunks, and native library/client execution. Make also builds the modular `sys` object used by the library tests. Clients can import that object with `-L`; they do not need to parse the standard library's source again. +`IncrementalBuildTest` checks reuse, transitive edits, bundled cycles, missing +inputs, and changed library objects using controlled timestamps. It also +compares native execution after an edit with a clean build. `make release` builds the launcher jar and standard library; `make view` starts the shared graph viewer. |