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v/vlib/v
2021-01-05 18:14:55 +02:00
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ast checker: warn when casting between reference types outside of unsafe (#7892) 2021-01-05 17:02:04 +02:00
builder builder: auto cleanup xxx.def generated by tcc on windows (#7878) 2021-01-05 17:07:07 +02:00
cflag v: add VCACHE support for thirdparty object files and for v build-module 2020-10-25 03:09:07 +03:00
checker checker: check if $if left is selector expr (#7897) 2021-01-05 18:14:55 +02:00
depgraph fmt: fix multiple things and format most of the compiler (#6631) 2020-10-15 22:12:59 +02:00
doc fmt: align struct field comments (#7632) 2021-01-03 21:10:25 +01:00
errors fmt: fix multiple things and format most of the compiler (#6631) 2020-10-15 22:12:59 +02:00
eval all: refactor UnionSumType to SumType (#6944) 2020-11-25 13:09:40 +02:00
fmt fmt: keep the shebang header in vsh files (#7893) 2021-01-05 16:14:16 +02:00
gen all: implement basic comptime field selector (#7888) 2021-01-05 16:11:43 +02:00
parser all: implement basic comptime field selector (#7888) 2021-01-05 16:11:43 +02:00
pkgconfig pkgconfig: improve and fix the parser; move to v.pkgconfig (#6695) 2020-10-29 11:57:23 +02:00
pref fmt: align struct field comments (#7632) 2021-01-03 21:10:25 +01:00
scanner fmt: keep the shebang header in vsh files (#7893) 2021-01-05 16:14:16 +02:00
table types: rename any_*, untyped * -> * literal (#7845) 2021-01-04 00:11:09 +02:00
tests all: implement basic comptime field selector (#7888) 2021-01-05 16:11:43 +02:00
token parser: add errors for invalid anonymous function (#7786) 2021-01-05 01:32:24 +01:00
util tests: fix ci error in vtest-fixed (fix #7827) (#7830) 2021-01-03 16:38:28 +01:00
vcache builder: use the same compilation mode for thirdparty object files (#7450) 2020-12-21 17:46:26 +01:00
vet fmt: make single-stmt or blocks single-line (#7126) 2020-12-04 13:25:23 +02:00
vmod checker: arr1=arr2 warning 2020-12-20 10:42:46 +01:00
compiler_errors_test.v tests: implement VAUTOFIX=1 ./v vlib/v/compiler_errors_test.v 2021-01-03 19:00:34 +02:00
README.md check-md: verify code example formatting (#7143) 2020-12-05 22:54:41 +01:00

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.table

table := table.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

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