v/vlib/v
Delyan Angelov 06d1422a05
ast,checker,cgen: support simple `const x = u16(0x53)` without using _vinit()
2021-07-30 17:22:27 +03:00
..
ast ast,checker,cgen: support simple `const x = u16(0x53)` without using _vinit() 2021-07-30 17:22:27 +03:00
builder v: support -show-depgraph in addition to -show-callgraph 2021-07-28 16:42:11 +03:00
callgraph v: support -show-depgraph in addition to -show-callgraph 2021-07-28 16:42:11 +03:00
cflag all: improve unused variable warning (fix `x = 1`, `x += 1` etc) 2021-04-23 13:33:48 +03:00
checker ast,checker,cgen: support simple `const x = u16(0x53)` without using _vinit() 2021-07-30 17:22:27 +03:00
depgraph v: support -show-depgraph in addition to -show-callgraph 2021-07-28 16:42:11 +03:00
doc all: simplify global_scope processing (#10848) 2021-07-18 15:29:34 +03:00
dotgraph v: support -show-depgraph in addition to -show-callgraph 2021-07-28 16:42:11 +03:00
embed_file ci: fix byteptr cast in embed_file.v 2021-04-05 07:27:26 +03:00
errors v: support compiler notices. Use them for `[deprecated_after: '2021-05-01']` tags 2021-03-22 19:59:00 +02:00
eval all: a massive merge of ast and table modules 2021-04-02 01:57:09 +03:00
fmt fmt: cleanup redundant generic types code (#10990) 2021-07-29 15:21:10 +03:00
gen ast,checker,cgen: support simple `const x = u16(0x53)` without using _vinit() 2021-07-30 17:22:27 +03:00
live parser: deprecate short struct init (#10842) 2021-07-20 11:17:08 +03:00
markused cgen: properly handle initialization expression for globals (#10981) 2021-07-28 08:11:55 +03:00
parser all: more improvements for global variables (#10986) 2021-07-29 10:57:31 +03:00
pkgconfig checker: string != IError (#10665) 2021-07-05 05:05:08 +03:00
pref fix running `v run file.v` in a current working folder containing a run/ subfolder 2021-07-30 03:28:54 +03:00
preludes v: replace execuast => executable 2021-05-31 09:39:18 +03:00
preludes_js js: draft support for compiling `-b js x_test.v` 2021-07-27 13:49:47 +03:00
scanner scanner: remove pos 0 hack which is no longer needed (#10935) 2021-07-25 01:13:07 +03:00
tests checker: force interface init (#10910) 2021-07-30 03:18:20 +03:00
token parser: deprecate short struct init (#10842) 2021-07-20 11:17:08 +03:00
util v.util: extract v.util.version, use it to speed up building `v repl`, `v up` and `v doctor` 2021-07-27 12:59:56 +03:00
vcache v.vcache: another workaround for a tcc arm64 runtime bug 2021-04-07 19:13:05 +03:00
vet v vet: give an error for trailing whitespace (#9574) 2021-04-09 13:22:14 +03:00
vmod v: support dump(expr) (#9160) 2021-03-06 18:09:28 +01:00
README.md all: a massive merge of ast and table modules 2021-04-02 01:57:09 +03:00
TEMPLATES.md tools: improve `v check-md` by checking for broken TOC headline links (#10417) 2021-06-14 13:12:02 +03:00
compiler_errors_test.v parser: deprecate short struct init (#10842) 2021-07-20 11:17:08 +03:00

README.md

Compiler pipeline

A simple high level explanation how the compiler pipeline (parser -> checker -> generator) works.

Reading files

Getting builtin files

To load all builtin files, a preference Preferences.lookup_path for the path where to look for exists. See Builder.get_builtin_files as example. If the file is a .vsh file and the backend is C, vlib/os will also be loaded as builtin.

Getting project files

Either there is a specific file: my_file.v or a directory containing V files. In the last case it scans that directory for all files. See Builder.v_files_from_dir as the helper method. This list of files needs to be filtered so that only *.v files exist.

Skips the following file types:

  • *_test.v
  • either *.c.v or *.c.js depending on the backend
  • all files that doesn't end with .v
  • Files that are not defined in Preferences.compile_defines or Preferences.compile_defines_all if any file is defined.

Parsing files

To parse something a new template is created as the first step:

import v.ast

table := ast.new_table()

a new preference is created:

import v.pref

pref := &pref.Preferences{}

and a new scope is created:

import v.ast

scope := ast.Scope{
	parent: 0
}

after that, you can parse your files.

Parse text

If you want to parse only text which isn't saved on the disk you can use this function.

import v.parser

code := ''
// table, pref and scope needs to be passed as reference
parsed_file := parser.parse_text(code, table, .parse_comments, &pref, &scope)

Parse a single file

For parsing files on disk, a path needs to be provided. The paths are collected one step earlier.

import v.parser

path := ''
// table, pref and scope needs to be passed as reference
parsed_file := parser.parse_file(path, table, .parse_comments, &pref, &scope)

Parse a set of files

If you have a batch of paths available which should be parsed, there is also a function which does all the work.

import v.parser

paths := ['']
// table, pref and scope needs to be passed as reference
parsed_files := parser.parse_files(paths, table, &pref, &scope)

Parse imports

A file often contains imports. These imports might need to be parsed as well. The builder contains a method which does this: Builder.parse_imports.

If the module which is imported isn't parsed already, you have to collect it relatively from the main file. For this the ast.File contains a list of imports. Those imports needs to be found on disk. . is just replaced with seperators in the relative location of the main file. Then all files from that directory are collected and parsed again like the previous steps explained.

Checking AST

A new checker is created:

import v.checker

mut checker := checker.new_checker(table, &pref)

After checking your files in checker.errors and checker.warnings you can see the results.

Check ast.File

checker.check(parsed_file)

Check a list of ast.File

checker.check_files(parsed_files)

Generate target from AST

Generating C code works just as this:

import v.gen.c

res := c.gen(parsed_files, table, &pref)