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@@ -2,9 +2,46 @@ A Simple showcase for the Sea-of-Nodes compiler IR This repo is intended to demonstrate the Sea-of-Nodes compiler IR. -The Sea-of-Nodes is the core IR inside of HotSpot's C2 compiler and Google's V8 compiler and Sun/Oracle's Graal compiler. + +The Sea-of-Nodes is the core IR inside of HotSpot's C2 compiler +and Google's V8 compiler and Sun/Oracle's Graal compiler. + Since we are show casing the SoN IR, the *language* being implemented is less important. We're using a very simple language similar to C or Java, but with far fewer features. -The Sea-of-Nodes is used for machine code generation in these industrial strength systems - but for this demonstration the backend is both difficult and less important. -This repo also is not intended to be a complete language in any sense, and so the backend will probably start with levering C or Java. +The Sea-of-Nodes is used for machine code generation in these industrial +strength systems - but for this demonstration the backend is both difficult +and less important. + +This repo also is not intended to be a complete language in any sense, +and so the backend will probably start with levering C or Java. + +## Chapters + +The following is a rough plan, subject to change. + +Each chapter will be self-sufficient and complete; in the sense that each chapter will fully implement +a subset of the simple language, and include everything that was created in the previous chapter. +Each chapter will also include a detailed commentary on relevant aspects of the +Sea Of Nodes intermediate representation. + +The simple language will be a small subset of C. +* [Language](language/README.md): Simple language grammar. +* [Chapter 1](chapter01/README.md): Empty script - i.e. empty function that takes no args and returns nothing, and has empty body. +* Chapter 2: Simple binary arithmetic such as addition, subtraction, multiplication, division with constants. Peephole optimization / simple constant folding. +* Chapter 3: Graphical Visualization of Sea of Nodes IR. +* Chapter 4: Local variables, and assignment statements. Read on RHS, SSA, more peephole optimization if local is a constant. +* Chapter 5: Binary and Comparison operators involving constants and variables. Non-zero values will be truthy. +* Chapter 6: `if` statement. CFG construction, peephole optimization around dead control flow. +* Chapter 7: `while` statement. +* Chapter 8: Global Value Numbering. +* Chapter 9: Function calls. +* Chapter 10: Boolean operators `&&`, `||` and `!` including short circuit. +* Chapter 11: `float` type. +* Chapter 12: Memory effects: general memory edges in SSA. Peephole optimization around load-after-store/store-after-store. +* Chapter 13: Equivalence class aliasing, fine grained peephole optimizations. Free ptr-to analysis in SoN; but does not handle aliasing in arrays. +* Chapter 14: One dimensional static length array type. Array load/store. +* Chapter 15: Global Code Motion - unwind SoN to CFG. Scheduling. +* Chapter 16: Instruction selection, BURS. +* Chapter 17: Backend register allocation. +* Chapter 18: Garbage Collection.
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