Improved documentation

This commit is contained in:
Eduard Urbach 2025-01-28 14:04:30 +01:00
parent 9a8cffe2f4
commit 92e4175bbd
Signed by: akyoto
GPG Key ID: C874F672B1AF20C0
4 changed files with 58 additions and 71 deletions

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### [Build.go](Build.go)
The `Build` type defines all the information needed to start building an executable file.
The name of the executable will be equal to the name of the build directory.
`Run` starts the build which will scan all `.q` source files in the build directory.
Every source file is scanned in its own goroutine for performance reasons.
Parallelization here is possible because the order of files in a directory is not significant.
The main thread is meanwhile waiting for new function objects to arrive from the scanners.
Once a function has arrived, it will be stored for compilation later.
We need to wait with the compilation step until we have enough information about all identifiers from the scan.
Then all the functions that were scanned will be compiled in parallel.
We create a separate goroutine for each function compilation.
Each function will then be translated to generic assembler instructions.
All the functions that are required to run the program will be added to the final assembler.
The final assembler resolves label addresses, optimizes the performance and generates the specific machine code from the generic instruction set.

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### [Main.go](Main.go)
Entry point.
The command line interface expects a command like `build` as the first argument.
Commands are implemented as functions in the `cli` directory.
Each command has its own set of parameters.
### [Build.go](Build.go)
The build command creates a new `Build` instance with the given directory and calls the `Run` method.
If no directory is specified, it will use the current directory.
If the `--dry` flag is specified, it will perform all tasks except the final write to disk.
This flag should be used in most tests and benchmarks to avoid needless disk writes.
```shell
q build
q build examples/hello
q build examples/hello --dry
```
Adding the `-a` or `--assembler` flag shows the generated assembly instructions:
```shell
q build examples/hello -a
```
Adding the `-v` or `--verbose` flag shows verbose compiler information:
```shell
q build examples/hello -v
```

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## [Function.go](Function.go)
This is the "heart" of the compiler.
Each function runs [Compile](Compile.go) which organizes the source code into an abstract syntax tree that is then compiled via [CompileAST](CompileAST.go).
You can think of AST nodes as the individual statements in your source code.

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- [token](token) - Converts a file to tokens with the `Tokenize` function - [token](token) - Converts a file to tokens with the `Tokenize` function
- [types](types) - Type system (w.i.p.) - [types](types) - Type system (w.i.p.)
- [x64](x64) - x86-64 implementation - [x64](x64) - x86-64 implementation
# Documentation
## [cli/Main.go](cli/Main.go)
Entry point.
The command line interface expects a command like `build` as the first argument.
Commands are implemented as functions in the [cli](cli) directory.
Each command has its own set of parameters.
## [cli/Build.go](cli/Build.go)
The build command creates a new `Build` instance with the given directory and calls the `Run` method.
If no directory is specified, it will use the current directory.
If the `--dry` flag is specified, it will perform all tasks except the final write to disk.
This flag should be used in most tests and benchmarks to avoid needless disk writes.
```shell
q build
q build examples/hello
q build examples/hello --dry
```
Adding the `-a` or `--assembler` flag shows the generated assembly instructions:
```shell
q build examples/hello -a
```
Adding the `-v` or `--verbose` flag shows verbose compiler information:
```shell
q build examples/hello -v
```
## [build/Build.go](build/Build.go)
The `Build` type defines all the information needed to start building an executable file.
The name of the executable will be equal to the name of the build directory.
`Run` starts the build which will scan all `.q` source files in the build directory.
Every source file is scanned in its own goroutine for performance reasons.
Parallelization here is possible because the order of files in a directory is not significant.
The main thread is meanwhile waiting for new function objects to arrive from the scanners.
Once a function has arrived, it will be stored for compilation later.
We need to wait with the compilation step until we have enough information about all identifiers from the scan.
Then all the functions that were scanned will be compiled in parallel.
We create a separate goroutine for each function compilation.
Each function will then be translated to generic assembler instructions.
All the functions that are required to run the program will be added to the final assembler.
The final assembler resolves label addresses, optimizes the performance and generates the specific machine code from the generic instruction set.
## [core/Function.go](core/Function.go)
This is the "heart" of the compiler.
Each function runs `f.Compile` which organizes the source code into an abstract syntax tree that is then compiled via `f.CompileAST`.
You can think of AST nodes as the individual statements in your source code.
## [ast/Parse.go](ast/Parse.go)
This is what generates the AST from tokens.
## [expression/Parse.go](expression/Parse.go)
This is what generates expressions from tokens.