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surtur 2022-06-14 16:46:11 +02:00
commit 43b9d611a2
Signed by: wanderer
GPG Key ID: 19CE1EC1D9E0486D
18 changed files with 2315 additions and 0 deletions
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use flake
# ref: https://github.com/direnv/direnv/wiki/Vim
# comment out if not planning to use this
add_extra_vimrc
# vim: ff=unix ft=sh

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augroup vimgo_local
autocmd!
" quality of life improvements, some as per
" https://github.com/fatih/vim-go/wiki/Tutorial#vimrc-improvements-1
" run :GoBuild or :GoTestCompile based on the go file
function! s:build_go_files()
let l:file = expand('%')
if l:file =~# '^\f\+_test\.go$'
call go#test#Test(0, 1)
elseif l:file =~# '^\f\+\.go$'
call go#cmd#Build(0)
endif
endfunction
autocmd FileType go nmap <leader>b :<C-u>call <SID>build_go_files()<CR>
autocmd FileType go nmap <leader>gb :<C-u>call <SID>build_go_files()<CR>
autocmd FileType go nmap <leader>gc <Plug>(go-coverage-toggle)
let g:go_gopls_gofumpt=1
let g:go_fmt_autosave=1
let g:go_highlight_types = 1
let g:go_fmt_command='gofumpt'
let g:go_test_timeout = '10s'
let g:go_highlight_build_constraints = 1
let g:go_metalinter_command = 'golangci-lint run .'
let g:go_metalinter_autosave = 1
let g:go_metalinter_deadline = '3s'
augroup END

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*.go diff=golang
*.md diff=markdown
*.vimrc linguist-language=vim

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.direnv
# binaries/symlinks to binaries
result
result-*
math-optim
.vimrc
# coverage or other binary files
*.out
# ignore image outputs by default, requiring explicit overrides
*.png
*.jp?g

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# Copyright 2022 wanderer <a_mirre at utb dot cz>
# SPDX-License-Identifier: GPL-3.0-or-later
---
run:
go: 1.17.10
tests: true
issues:
max-issues-per-linter: 0
max-same-issues: 0
linters:
enable:
- bidichk
- bodyclose
- dupl
- deadcode
- decorder
- dogsled
- exportloopref
- forbidigo
- gas
- gocognit
- goconst
- gocritic
- godot
- govet
- gofmt
- gofumpt
- goimports
- goprintffuncname
- gosec
- ineffassign
- ifshort
- misspell
# - prealloc # disable for now as it might be premature optimisation
- revive
- unconvert
- unparam
- varcheck
- whitespace
- wsl
linter-settings:
dupl:
threshold: 100
gocritic:
enabled-tags:
- diagnostic
- experimental
- opinionated
- performance
- style
disabled-checks:
- dupImport # https://github.com/go-critic/go-critic/issues/845
- ifElseChain
- octalLiteral
- whyNoLint
- wrapperFunc
gocyclo:
min-complexity: 15
gofumpt:
extra-rules: true
lang-version: "1.18"
govet:
check-shadowing: true
revive:
severity: warning
confidence: 0.8
errorCode: 1
warningCode: 1
rules:
- name: blank-imports
- name: context-as-argument
- name: context-keys-type
- name: dot-imports
- name: error-return
- name: error-strings
- name: error-naming
- name: exported
- name: if-return
- name: increment-decrement
- name: var-naming
- name: var-declaration
- name: package-comments
- name: range
- name: receiver-naming
- name: time-naming
- name: unexported-return
- name: indent-error-flow
- name: errorf
- name: duplicated-imports
- name: modifies-value-receiver
...

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.pre-commit-config.yaml Normal file
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# Copyright 2022 wanderer <a_mirre at utb dot cz>
# SPDX-License-Identifier: GPL-3.0-or-later
---
fail_fast: false
repos:
- repo: https://github.com/pre-commit/pre-commit-hooks
rev: v4.2.0
hooks:
- id: check-merge-conflict
- repo: meta
hooks:
- id: check-hooks-apply
- repo: local
hooks:
- id: statix
name: statix
entry: statix check .
always_run: false
pass_filenames: false
files: '\.*.nix$'
language: system
- id: nix-fmt
name: nix fmt
entry: nix fmt -- --check .
always_run: false
pass_filenames: false
files: '\.*.nix$'
language: system
- id: flake-check
name: nix flake check
entry: nix flake check --keep-going
always_run: false
pass_filenames: false
files: "flake.(nix|lock)$"
language: system
- id: addlicense
name: addlicence -check
entry: >
go run github.com/google/addlicense@v1.0.0 -check -v
pass_filenames: true
types_or: ["go", "yaml"]
exclude: "^.drone.*"
language: system
- repo: https://github.com/dnephin/pre-commit-golang
rev: v0.5.0
hooks:
- id: go-mod-tidy
- id: go-unit-tests
- id: golangci-lint
- id: go-build
- repo: local
hooks:
- id: nix-build
name: nix build
entry: nix build .#math-optim
pass_filenames: false
# trigger this hook on changes to any of nix (also flake.lock) files
# and go's mod or sum files
files: '\.*.(nix|lock|mod|sum)$'
language: system

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GNU GENERAL PUBLIC LICENSE
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contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
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License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
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14. Revised Versions of this License.
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possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
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state the exclusion of warranty; and each file should have at least
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

11
README.md Normal file
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# [`math-optim`](https://git.dotya.ml/wanderer/math-optim)
> solving a few mathematical optimisation tasks using well-known algorithms
[![built with nix](https://builtwithnix.org/badge.svg)](https://builtwithnix.org)
this repo holds the *sawce* of the semestral project for the Mathematical
Informatics course.
### LICENSE
GPL-3.0-or-later (see [LICENSE](LICENSE) for details).

16
default.nix Normal file
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@ -0,0 +1,16 @@
(
import
(
let
lock = builtins.fromJSON (builtins.readFile ./flake.lock);
in
fetchTarball {
url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
sha256 = lock.nodes.flake-compat.locked.narHash;
}
)
{
src = ./.;
}
)
.defaultNix

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flake.lock Normal file
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{
"nodes": {
"flake-compat": {
"flake": false,
"locked": {
"lastModified": 1650374568,
"narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
"owner": "edolstra",
"repo": "flake-compat",
"rev": "b4a34015c698c7793d592d66adbab377907a2be8",
"type": "github"
},
"original": {
"owner": "edolstra",
"repo": "flake-compat",
"type": "github"
}
},
"nix-filter": {
"locked": {
"lastModified": 1653590866,
"narHash": "sha256-E4yKIrt/S//WfW5D9IhQ1dVuaAy8RE7EiCMfnbrOC78=",
"owner": "numtide",
"repo": "nix-filter",
"rev": "3e81a637cdf9f6e9b39aeb4d6e6394d1ad158e16",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "nix-filter",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1652840887,
"narHash": "sha256-gEK4NNa4GwIgTZE63kt/4WTFAWRTJVSa30+h4ZjFh9U=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "52dc75a4fee3fdbcb792cb6fba009876b912bfe0",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixpkgs-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"flake-compat": "flake-compat",
"nix-filter": "nix-filter",
"nixpkgs": "nixpkgs"
}
}
},
"root": "root",
"version": 7
}

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flake.nix Normal file
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@ -0,0 +1,202 @@
{
description = "mathematical informatics course semestral project solving a few mathematical optimisation tasks using well-known algorithms";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
flake-compat = {
url = "github:edolstra/flake-compat";
flake = false;
inputs.nixpkgs.follows = "nixpkgs";
};
nix-filter = {
url = "github:numtide/nix-filter";
inputs.nixpkgs.follows = "nixpkgs";
};
};
outputs = {
self,
nixpkgs,
nix-filter,
...
}: let
projname = "math-optim";
# to work with older version of flakes
lastModifiedDate =
self.lastModifiedDate or self.lastModified or "19700101";
# Generate a user-friendly version number.
version = "v0.0.0";
# System types to support.
# supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
supportedSystems = ["x86_64-linux" "aarch64-linux"];
# Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
# Nixpkgs instantiated for supported system types.
nixpkgsFor = forAllSystems (system:
import nixpkgs {
inherit system;
overlays = [
# no overlay imports atm
(import ./overlay.nix)
];
});
in rec {
formatter = forAllSystems (
system:
nixpkgsFor.${system}.alejandra
);
packages = forAllSystems (system: let
pkgs = nixpkgsFor.${system};
inherit (pkgs) lib overlays; # -> lib = pkgs.lib;overlays = pkgs.overlays;
in rec {
math-optim = with pkgs;
buildGoModule rec {
pname = "${projname}";
buildInputs = [
go
];
nativeBuildInputs = [pkgconfig];
overrideModAttrs = _: {
GOPROXY = "direct";
};
inherit version;
doCheck = false;
# use go.mod for managing go deps, instead of vendor-only dir
proxyVendor = true;
tags = []; # go "-tags" to build with
ldflags = [
"-s"
"-w"
"-X main.version=${version}"
];
modSha256 = lib.fakeSha256;
# dont't forget to update vendorSha256 whenever go.mod or go.sum change
vendorSha256 = "sha256-pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=";
# In 'nix develop', we don't need a copy of the source tree
# in the Nix store.
src = nix-filter.lib.filter {
root = lib.cleanSource ./.;
exclude = [
./flake.nix
./flake.lock
./default.nix
./shell.nix
];
};
meta = {
description = "mathematical informatics course semestral project solving a few mathematical optimisation tasks using well-known algorithms";
homepage = "https://git.dotya.ml/wanderer/math-optim";
license = lib.licenses.gpl3;
maintainers = ["wanderer"];
platforms = lib.platforms.linux ++ lib.platforms.darwin;
};
};
default = math-optim;
});
apps = forAllSystems (system: rec {
math-optim = {
type = "app";
program = "${self.packages.${system}.${projname}}/bin/${projname}";
};
default = math-optim;
});
devShells = forAllSystems (
system: let
pkgs = import nixpkgs {
inherit system;
overlays = [
(import ./overlay.nix)
];
};
goPkgs = import nixpkgs {
useFetched = true;
inherit system;
overlays =
self.overlays
or []
++ [
(import ./overlay.nix)
];
};
gob = pkgs.writeShellScriptBin "gob" ''
cd $(git rev-parse --show-toplevel)
go build -v ./...
'';
gota = pkgs.writeShellScriptBin "gota" ''
cd $(git rev-parse --show-toplevel)
go test ./...
'';
upcache = pkgs.writeShellScriptBin "upcache" ''
## refs:
## https://fzakaria.com/2020/08/11/caching-your-nix-shell.html
## https://nixos.wiki/wiki/Caching_nix_shell_build_inputs
nix-store --query --references $(nix-instantiate shell.nix) | \
xargs nix-store --realise | \
xargs nix-store --query --requisites | \
cachix push ${projname}
'';
add-license = pkgs.writeShellScriptBin "add-license" ''
go run github.com/google/addlicense@v1.0.0 -v \
-c "wanderer <a_mirre at utb dot cz>" \
-l "GPL-3.0-or-later" -s .
'';
in {
default = with pkgs;
mkShell
{
name = "${projname}-" + version;
GOFLAGS = "-buildmode=pie -trimpath -mod=readonly -modcacherw";
GOLDFLAGS = "-s -w -X main.version=${version}";
CGO_CFLAGS = "-g0 -mtune=native";
CGO_LDFLAGS = "-Wl,-O1,-sort-common,-as-needed,-z,relro,-z,now,-flto -pthread";
GOPROXY = "direct";
shellHook = ''
echo " -- in math-optim dev shell..."
'';
nativeBuildInputs = [
];
packages =
[
# use pathed go, as it's (supposed to be) faster with cgo,
# which will inevitably encountered anyway.
goPkgs.go
go-tools
gopls
gofumpt
statix
golangci-lint
alejandra
## ad-hoc cmds
gob
gota
upcache
add-license
]
++ (
if stdenv.isLinux
then [
]
else []
);
};
}
);
};
}

3
go.mod Normal file
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@ -0,0 +1,3 @@
module git.dotya.ml/wanderer/math-optim
go 1.18

0
go.sum Normal file
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15
main.go Normal file
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@ -0,0 +1,15 @@
// Copyright 2022 wanderer <a_mirre at utb dot cz>
// SPDX-License-Identifier: GPL-3.0-or-later
package main
import (
"log"
)
var version = "development"
func main() {
log.Println("starting math-optim version ", version)
log.Println("hey")
}

64
overlay.nix Normal file
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@ -0,0 +1,64 @@
# heavily inspired by https://github.com/diamondburned/gotk4-nix/blob/d2bd6577f1867cb740b281baa48a895aed494967/overlay.nix
self: super: let
patchelfer = arch: interpreter:
super.writeShellScriptBin
"${super.patchelf}/bin/patchelf --set-interpreter ${interpreter} \"$@\"";
in {
go = super.go.overrideAttrs (old: {
version = "1.18.2";
src = builtins.fetchurl {
url = "https://go.dev/dl/go1.18.2.src.tar.gz";
sha256 = "sha256:1qk7as7a5wx3522ldsq8il1il9ic5xhbl6drg89r4h63l8zd0i1c";
};
doCheck = false;
patches =
(old.patches or [])
++ [
# cmd/go/internal/work: concurrent ccompile routines
(super.fetchpatch {
url = "https://github.com/diamondburned/go/commit/ec3e1c9471f170187b6a7c83ab0364253f895c28.patch";
sha256 = "sha256-KXP3gHRVHCVY60HnrLHv+QLib1hSYZOxsMjkbAiNi1g=";
})
# cmd/cgo: concurrent file generation
(super.fetchpatch {
url = "https://github.com/diamondburned/go/commit/50e04befeca9ae63296a73c8d5d2870b904971b4.patch";
sha256 = "sha256-6PNUBlhGj53XS7f3dYOisDQ1PJldqwmWcgBnPE0cZsE=";
})
# the patches are also present locally for archival purposes
# ./patches/diamondburned/go/ec3e1c9471f170187b6a7c83ab0364253f895c28.patch
# ./patches/diamondburned/go/50e04befeca9ae63296a73c8d5d2870b904971b4.patch
# TODO(me): don't forget to download the patch files when bumping the
# urls above
];
});
# might as well be 'buildGoModule = super.buildGo118Module.override' but
# we're overriding just the go package itself and leaving the rest of the
# function alone. letting 'builGoModule' to be updated only with flake's
# nixpkgs updates therefore seems to be the more reasonable option.
buildGoModule = super.buildGoModule.override {
# use the go we just built from sources as 'go' in the buildGoModule func
inherit (self) go;
};
inherit (super) go-tools;
# See https://sourceware.org/glibc/wiki/ABIList.
patchelf-x86_64 = patchelfer "x86_64" "/lib64/ld-linux-x86-64.so.2";
patchelf-aarch64 = patchelfer "aarch64" "/lib/ld-linux-aarch64.so.1";
#dominikh = {
# go-tools = self.buildGoModule {
# name = "dominikh-go-tools";
# src = super.fetchFromGitHub {
# owner = "dominikh";
# repo = "go-tools";
# rev = "f4a2f64ce2386d1d392f2da44043c5ee3fb48216";
# sha256 = "1yhbz2sf332b6i00slsj4cn8r66x27kddw5vcjygkkiyny1a99qb";
# };
# vendorSha256 = "09jbarlbq47pcxy5zkja8gqvnqjp2mpbxnciv9lhilw9swqqwc0j";
# doCheck = false;
# subPackages = [ "cmd/staticcheck" ];
# };
#};
}

883
patches/diamondburned/go/50e04befeca9ae63296a73c8d5d2870b904971b4.patch Normal file
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@ -0,0 +1,883 @@
From 50e04befeca9ae63296a73c8d5d2870b904971b4 Mon Sep 17 00:00:00 2001
From: diamondburned <datutbrus@gmail.com>
Date: Thu, 5 Aug 2021 16:47:49 -0700
Subject: [PATCH] cmd/cgo: concurrent file generation
This commit allows cmd/cgo to generate files in parallel to each other.
The parallelism is determined by either the thread count (using
$GOMAXPROCS) or the -nparallel flag, which is set in
cmd/go/internal/work to be maximum 4.
The commit addresses some existing race conditions that had to do with
mutating the global state by using a global write mutex during the
translation stage.
Other race conditions that had to do with mutating the Package singleton
was solved by giving each translation worker its own package, and then
combining them back into a single package.
With this and the cmd/go/internal/work changes in place, build time
(from scratch, with -a) for gotktrix is reduced from 33 minutes to 10
minutes on an 8-thread Intel Core i5-8250U.
---
src/cmd/cgo/gcc.go | 120 +++++++++++-----
src/cmd/cgo/godefs.go | 6 +-
src/cmd/cgo/main.go | 238 ++++++++++++++++++++++++-------
src/cmd/cgo/out.go | 20 ++-
src/cmd/cgo/util.go | 13 +-
src/cmd/go/internal/work/exec.go | 7 +-
6 files changed, 303 insertions(+), 101 deletions(-)
diff --git a/src/cmd/cgo/gcc.go b/src/cmd/cgo/gcc.go
index 997a830994f0..59a8405c0c71 100644
--- a/src/cmd/cgo/gcc.go
+++ b/src/cmd/cgo/gcc.go
@@ -26,6 +26,8 @@ import (
"os/exec"
"strconv"
"strings"
+ "sync"
+ "sync/atomic"
"unicode"
"unicode/utf8"
@@ -485,7 +487,7 @@ func (p *Package) guessKinds(f *File) []*Name {
}
needType = append(needType, n)
}
- if nerrors > 0 {
+ if nerrors.has() {
// Check if compiling the preamble by itself causes any errors,
// because the messages we've printed out so far aren't helpful
// to users debugging preamble mistakes. See issue 8442.
@@ -727,9 +729,12 @@ func (p *Package) prepareNames(f *File) {
}
}
p.mangleName(n)
+
+ globalMu.Lock()
if n.Kind == "type" && typedef[n.Mangle] == nil {
typedef[n.Mangle] = n.Type
}
+ globalMu.Unlock()
}
}
@@ -1023,7 +1028,7 @@ func (p *Package) hasPointer(f *File, t ast.Expr, top bool) bool {
}
// Check whether this is a pointer to a C union (or class)
// type that contains a pointer.
- if unionWithPointer[t.X] {
+ if isUnionWithPointer(t.X) {
return true
}
return p.hasPointer(f, t.X, false)
@@ -1046,7 +1051,10 @@ func (p *Package) hasPointer(f *File, t ast.Expr, top bool) bool {
}
}
}
- if def := typedef[t.Name]; def != nil {
+ globalMu.Lock()
+ def := typedef[t.Name]
+ globalMu.Unlock()
+ if def != nil {
return p.hasPointer(f, def.Go, top)
}
if t.Name == "string" {
@@ -1582,7 +1590,7 @@ func checkGCCBaseCmd() ([]string, error) {
}
// gccMachine returns the gcc -m flag to use, either "-m32", "-m64" or "-marm".
-func (p *Package) gccMachine() []string {
+func gccMachine() []string {
switch goarch {
case "amd64":
if goos == "darwin" {
@@ -1617,20 +1625,20 @@ func (p *Package) gccMachine() []string {
return nil
}
-func gccTmp() string {
- return *objDir + "_cgo_.o"
+func (p *Package) gccTmp() string {
+ return fmt.Sprintf("%s_%d_cgo_.o", *objDir, p.workerID)
}
// gccCmd returns the gcc command line to use for compiling
// the input.
func (p *Package) gccCmd() []string {
c := append(gccBaseCmd,
- "-w", // no warnings
- "-Wno-error", // warnings are not errors
- "-o"+gccTmp(), // write object to tmp
- "-gdwarf-2", // generate DWARF v2 debugging symbols
- "-c", // do not link
- "-xc", // input language is C
+ "-w", // no warnings
+ "-Wno-error", // warnings are not errors
+ "-o"+p.gccTmp(), // write object to tmp
+ "-gdwarf-2", // generate DWARF v2 debugging symbols
+ "-c", // do not link
+ "-xc", // input language is C
)
if p.GccIsClang {
c = append(c,
@@ -1653,7 +1661,7 @@ func (p *Package) gccCmd() []string {
}
c = append(c, p.GccOptions...)
- c = append(c, p.gccMachine()...)
+ c = append(c, gccMachine()...)
if goos == "aix" {
c = append(c, "-maix64")
c = append(c, "-mcmodel=large")
@@ -1717,11 +1725,11 @@ func (p *Package) gccDebug(stdin []byte, nnames int) (d *dwarf.Data, ints []int6
}
}
- if f, err := macho.Open(gccTmp()); err == nil {
+ if f, err := macho.Open(p.gccTmp()); err == nil {
defer f.Close()
d, err := f.DWARF()
if err != nil {
- fatalf("cannot load DWARF output from %s: %v", gccTmp(), err)
+ fatalf("cannot load DWARF output from %s: %v", p.gccTmp(), err)
}
bo := f.ByteOrder
if f.Symtab != nil {
@@ -1795,11 +1803,11 @@ func (p *Package) gccDebug(stdin []byte, nnames int) (d *dwarf.Data, ints []int6
return d, ints, floats, strs
}
- if f, err := elf.Open(gccTmp()); err == nil {
+ if f, err := elf.Open(p.gccTmp()); err == nil {
defer f.Close()
d, err := f.DWARF()
if err != nil {
- fatalf("cannot load DWARF output from %s: %v", gccTmp(), err)
+ fatalf("cannot load DWARF output from %s: %v", p.gccTmp(), err)
}
bo := f.ByteOrder
symtab, err := f.Symbols()
@@ -1874,11 +1882,11 @@ func (p *Package) gccDebug(stdin []byte, nnames int) (d *dwarf.Data, ints []int6
return d, ints, floats, strs
}
- if f, err := pe.Open(gccTmp()); err == nil {
+ if f, err := pe.Open(p.gccTmp()); err == nil {
defer f.Close()
d, err := f.DWARF()
if err != nil {
- fatalf("cannot load DWARF output from %s: %v", gccTmp(), err)
+ fatalf("cannot load DWARF output from %s: %v", p.gccTmp(), err)
}
bo := binary.LittleEndian
for _, s := range f.Symbols {
@@ -1946,11 +1954,11 @@ func (p *Package) gccDebug(stdin []byte, nnames int) (d *dwarf.Data, ints []int6
return d, ints, floats, strs
}
- if f, err := xcoff.Open(gccTmp()); err == nil {
+ if f, err := xcoff.Open(p.gccTmp()); err == nil {
defer f.Close()
d, err := f.DWARF()
if err != nil {
- fatalf("cannot load DWARF output from %s: %v", gccTmp(), err)
+ fatalf("cannot load DWARF output from %s: %v", p.gccTmp(), err)
}
bo := binary.BigEndian
for _, s := range f.Symbols {
@@ -2016,7 +2024,7 @@ func (p *Package) gccDebug(stdin []byte, nnames int) (d *dwarf.Data, ints []int6
buildStrings()
return d, ints, floats, strs
}
- fatalf("cannot parse gcc output %s as ELF, Mach-O, PE, XCOFF object", gccTmp())
+ fatalf("cannot parse gcc output %s as ELF, Mach-O, PE, XCOFF object", p.gccTmp())
panic("not reached")
}
@@ -2026,7 +2034,7 @@ func (p *Package) gccDebug(stdin []byte, nnames int) (d *dwarf.Data, ints []int6
// and its included files.
func (p *Package) gccDefines(stdin []byte) string {
base := append(gccBaseCmd, "-E", "-dM", "-xc")
- base = append(base, p.gccMachine()...)
+ base = append(base, gccMachine()...)
stdout, _ := runGcc(stdin, append(append(base, p.GccOptions...), "-"))
return stdout
}
@@ -2126,7 +2134,13 @@ type typeConv struct {
intSize int64
}
-var tagGen int
+var tagGenCounter int64
+
+func genTag() int {
+ return int(atomic.AddInt64(&tagGenCounter, 1) - 1)
+}
+
+var globalMu sync.Mutex
var typedef = make(map[string]*Type)
var goIdent = make(map[string]*ast.Ident)
@@ -2134,6 +2148,29 @@ var goIdent = make(map[string]*ast.Ident)
// that may contain a pointer. This is used for cgo pointer checking.
var unionWithPointer = make(map[ast.Expr]bool)
+func unionWithPointerTrueIfKey(setKey, ifKey ast.Expr) {
+ globalMu.Lock()
+ defer globalMu.Unlock()
+
+ if unionWithPointer[ifKey] {
+ unionWithPointer[setKey] = true
+ }
+}
+
+func isUnionWithPointer(key ast.Expr) bool {
+ globalMu.Lock()
+ defer globalMu.Unlock()
+
+ return unionWithPointer[key]
+}
+
+func unionWithPointerTrue(key ast.Expr) {
+ globalMu.Lock()
+ defer globalMu.Unlock()
+
+ unionWithPointer[key] = true
+}
+
// anonymousStructTag provides a consistent tag for an anonymous struct.
// The same dwarf.StructType pointer will always get the same tag.
var anonymousStructTag = make(map[*dwarf.StructType]string)
@@ -2472,9 +2509,7 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
t.Size = t1.Size
t.Align = t1.Align
t.Go = t1.Go
- if unionWithPointer[t1.Go] {
- unionWithPointer[t.Go] = true
- }
+ unionWithPointerTrueIfKey(t.Go, t1.Go)
t.EnumValues = nil
t.Typedef = ""
t.C.Set("%s "+dt.Qual, t1.C)
@@ -2488,18 +2523,21 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
break
}
if tag == "" {
+ globalMu.Lock()
tag = anonymousStructTag[dt]
if tag == "" {
- tag = "__" + strconv.Itoa(tagGen)
- tagGen++
+ tag = "__" + strconv.Itoa(genTag())
anonymousStructTag[dt] = tag
}
+ globalMu.Unlock()
} else if t.C.Empty() {
t.C.Set(dt.Kind + " " + tag)
}
name := c.Ident("_Ctype_" + dt.Kind + "_" + tag)
t.Go = name // publish before recursive calls
+ globalMu.Lock()
goIdent[name.Name] = name
+ globalMu.Unlock()
if dt.ByteSize < 0 {
// Size calculation in c.Struct/c.Opaque will die with size=-1 (unknown),
// so execute the basic things that the struct case would do
@@ -2519,20 +2557,24 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
// on the Go heap, right? It currently doesn't work for unions because
// they are defined as a type alias for struct{}, not a defined type.
}
+ globalMu.Lock()
typedef[name.Name] = &tt
+ globalMu.Unlock()
break
}
switch dt.Kind {
case "class", "union":
t.Go = c.Opaque(t.Size)
if c.dwarfHasPointer(dt, pos) {
- unionWithPointer[t.Go] = true
+ unionWithPointerTrue(t.Go)
}
if t.C.Empty() {
t.C.Set("__typeof__(unsigned char[%d])", t.Size)
}
t.Align = 1 // TODO: should probably base this on field alignment.
+ globalMu.Lock()
typedef[name.Name] = t
+ globalMu.Unlock()
case "struct":
g, csyntax, align := c.Struct(dt, pos)
if t.C.Empty() {
@@ -2545,7 +2587,9 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
}
tt.Go = g
tt.NotInHeap = c.notInHeapStructs[tag]
+ globalMu.Lock()
typedef[name.Name] = &tt
+ globalMu.Unlock()
}
case *dwarf.TypedefType:
@@ -2568,7 +2612,9 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
break
}
name := c.Ident("_Ctype_" + dt.Name)
+ globalMu.Lock()
goIdent[name.Name] = name
+ globalMu.Unlock()
akey := ""
if c.anonymousStructTypedef(dt) {
// only load type recursively for typedefs of anonymous
@@ -2583,10 +2629,12 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
s.BadPointer = true
sub = &s
// Make sure we update any previously computed type.
+ globalMu.Lock()
if oldType := typedef[name.Name]; oldType != nil {
oldType.Go = sub.Go
oldType.BadPointer = true
}
+ globalMu.Unlock()
}
if c.badVoidPointerTypedef(dt) {
// Treat this typedef as a pointer to a NotInHeap void.
@@ -2615,11 +2663,10 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
t.Go = name
t.BadPointer = sub.BadPointer
t.NotInHeap = sub.NotInHeap
- if unionWithPointer[sub.Go] {
- unionWithPointer[t.Go] = true
- }
+ unionWithPointerTrueIfKey(t.Go, sub.Go)
t.Size = sub.Size
t.Align = sub.Align
+ globalMu.Lock()
oldType := typedef[name.Name]
if oldType == nil {
tt := *t
@@ -2628,6 +2675,7 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
tt.NotInHeap = sub.NotInHeap
typedef[name.Name] = &tt
}
+ globalMu.Unlock()
// If sub.Go.Name is "_Ctype_struct_foo" or "_Ctype_union_foo" or "_Ctype_class_foo",
// use that as the Go form for this typedef too, so that the typedef will be interchangeable
@@ -2638,7 +2686,9 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
if isStructUnionClass(sub.Go) {
// Use the typedef name for C code.
+ globalMu.Lock()
typedef[sub.Go.(*ast.Ident).Name].C = t.C
+ globalMu.Unlock()
}
// If we've seen this typedef before, and it
@@ -2698,8 +2748,12 @@ func (c *typeConv) loadType(dtype dwarf.Type, pos token.Pos, parent string) *Typ
}
s = strings.Replace(s, " ", "", -1)
name := c.Ident("_Ctype_" + s)
+
tt := *t
+ globalMu.Lock()
typedef[name.Name] = &tt
+ globalMu.Unlock()
+
if !*godefs {
t.Go = name
}
diff --git a/src/cmd/cgo/godefs.go b/src/cmd/cgo/godefs.go
index c0d59aee01d7..740aa3bc30b2 100644
--- a/src/cmd/cgo/godefs.go
+++ b/src/cmd/cgo/godefs.go
@@ -115,11 +115,11 @@ func (p *Package) godefs(f *File) string {
return buf.String()
}
-var gofmtBuf bytes.Buffer
-
// gofmt returns the gofmt-formatted string for an AST node.
func gofmt(n interface{}) string {
- gofmtBuf.Reset()
+ var gofmtBuf strings.Builder
+ gofmtBuf.Grow(512)
+
err := printer.Fprint(&gofmtBuf, fset, n)
if err != nil {
return "<" + err.Error() + ">"
diff --git a/src/cmd/cgo/main.go b/src/cmd/cgo/main.go
index 14642b7576b0..36e76908c602 100644
--- a/src/cmd/cgo/main.go
+++ b/src/cmd/cgo/main.go
@@ -26,6 +26,7 @@ import (
"runtime"
"sort"
"strings"
+ "sync"
"cmd/internal/edit"
"cmd/internal/objabi"
@@ -33,6 +34,8 @@ import (
// A Package collects information about the package we're going to write.
type Package struct {
+ workerID int
+
PackageName string // name of package
PackagePath string
PtrSize int64
@@ -40,17 +43,36 @@ type Package struct {
GccOptions []string
GccIsClang bool
CgoFlags map[string][]string // #cgo flags (CFLAGS, LDFLAGS)
- Written map[string]bool
- Name map[string]*Name // accumulated Name from Files
+ Written *WrittenFiles
+ Name map[string]*Name // TODO: parallelize. accumulated Name from Files
ExpFunc []*ExpFunc // accumulated ExpFunc from Files
- Decl []ast.Decl
- GoFiles []string // list of Go files
- GccFiles []string // list of gcc output files
- Preamble string // collected preamble for _cgo_export.h
+ Decl []ast.Decl `json:"-"`
+ GoFiles []string // list of Go files
+ GccFiles []string // list of gcc output files
+ Preamble string // collected preamble for _cgo_export.h
+
typedefs map[string]bool // type names that appear in the types of the objects we're interested in
typedefList []typedefInfo
}
+type WrittenFiles struct {
+ mut sync.Mutex
+ written map[string]struct{}
+}
+
+func (w *WrittenFiles) Mark(file string) (shouldWrite bool) {
+ w.mut.Lock()
+ defer w.mut.Unlock()
+
+ _, already := w.written[file]
+ if already {
+ return false
+ }
+
+ w.written[file] = struct{}{}
+ return true
+}
+
// A typedefInfo is an element on Package.typedefList: a typedef name
// and the position where it was required.
type typedefInfo struct {
@@ -87,7 +109,7 @@ func nameKeys(m map[string]*Name) []string {
// A Call refers to a call of a C.xxx function in the AST.
type Call struct {
- Call *ast.CallExpr
+ Call *ast.CallExpr `json:"-"`
Deferred bool
Done bool
}
@@ -95,7 +117,7 @@ type Call struct {
// A Ref refers to an expression of the form C.xxx in the AST.
type Ref struct {
Name *Name
- Expr *ast.Expr
+ Expr *ast.Expr `json:"-"`
Context astContext
Done bool
}
@@ -108,13 +130,13 @@ var nameKinds = []string{"iconst", "fconst", "sconst", "type", "var", "fpvar", "
// A Name collects information about C.xxx.
type Name struct {
- Go string // name used in Go referring to package C
- Mangle string // name used in generated Go
- C string // name used in C
- Define string // #define expansion
- Kind string // one of the nameKinds
- Type *Type // the type of xxx
- FuncType *FuncType
+ Go string // name used in Go referring to package C
+ Mangle string // name used in generated Go
+ C string // name used in C
+ Define string // #define expansion
+ Kind string // one of the nameKinds
+ Type *Type `json:"-"` // the type of xxx
+ FuncType *FuncType `json:"-"`
AddError bool
Const string // constant definition
}
@@ -133,23 +155,23 @@ func (n *Name) IsConst() bool {
// Such functions are identified in the Go input file
// by doc comments containing the line //export ExpName
type ExpFunc struct {
- Func *ast.FuncDecl
- ExpName string // name to use from C
+ Func *ast.FuncDecl `json:"-"`
+ ExpName string // name to use from C
Doc string
}
// A TypeRepr contains the string representation of a type.
type TypeRepr struct {
Repr string
- FormatArgs []interface{}
+ FormatArgs []interface{} `json:"-"`
}
// A Type collects information about a type in both the C and Go worlds.
type Type struct {
Size int64
Align int64
- C *TypeRepr
- Go ast.Expr
+ C *TypeRepr `json:"-"`
+ Go ast.Expr `json:"-"`
EnumValues map[string]int64
Typedef string
BadPointer bool // this pointer type should be represented as a uintptr (deprecated)
@@ -223,6 +245,8 @@ var cPrefix string
var fset = token.NewFileSet()
+var nparallel = flag.Int("nparallel", runtime.GOMAXPROCS(0), "maximum parallel jobs")
+
var dynobj = flag.String("dynimport", "", "if non-empty, print dynamic import data for that file")
var dynout = flag.String("dynout", "", "write -dynimport output to this file")
var dynpackage = flag.String("dynpackage", "main", "set Go package for -dynimport output")
@@ -241,11 +265,13 @@ var exportHeader = flag.String("exportheader", "", "where to write export header
var gccgo = flag.Bool("gccgo", false, "generate files for use with gccgo")
var gccgoprefix = flag.String("gccgoprefix", "", "-fgo-prefix option used with gccgo")
var gccgopkgpath = flag.String("gccgopkgpath", "", "-fgo-pkgpath option used with gccgo")
-var gccgoMangler func(string) string
var importRuntimeCgo = flag.Bool("import_runtime_cgo", true, "import runtime/cgo in generated code")
var importSyscall = flag.Bool("import_syscall", true, "import syscall in generated code")
var trimpath = flag.String("trimpath", "", "applies supplied rewrites or trims prefixes to recorded source file paths")
+var gccgoMangler func(string) string
+var gccgoManglerOnce sync.Once
+
var goarch, goos, gomips, gomips64 string
var gccBaseCmd []string
@@ -302,7 +328,7 @@ func main() {
}
}
- p := newPackage(args[:i])
+ p := newPackage(args[:i], 0)
// We need a C compiler to be available. Check this.
var err error
@@ -370,43 +396,152 @@ func main() {
}
*objDir += string(filepath.Separator)
- for i, input := range goFiles {
- f := fs[i]
- p.Translate(f)
- for _, cref := range f.Ref {
- switch cref.Context {
- case ctxCall, ctxCall2:
- if cref.Name.Kind != "type" {
- break
- }
- old := *cref.Expr
- *cref.Expr = cref.Name.Type.Go
- f.Edit.Replace(f.offset(old.Pos()), f.offset(old.End()), gofmt(cref.Name.Type.Go))
- }
- }
- if nerrors > 0 {
- os.Exit(2)
- }
- p.PackagePath = f.Package
- p.Record(f)
- if *godefs {
- os.Stdout.WriteString(p.godefs(f))
- } else {
- p.writeOutput(f, input)
+ pkgs := doFiles(p, goFiles, fs)
+
+ if !*godefs {
+ pkg := coalescePackages(pkgs)
+ pkg.writeDefs()
+ }
+
+ if nerrors.get() > 0 {
+ os.Exit(2)
+ }
+}
+
+type doFileJob struct {
+ input string
+ file *File
+}
+
+func doFiles(p *Package, inputs []string, files []*File) []*Package {
+ if len(inputs) != len(files) {
+ fatalf("unexpected len(inputs) %d != len(files) %d", len(inputs), len(files))
+ }
+
+ jobCh := make(chan doFileJob)
+
+ var wg sync.WaitGroup
+ wg.Add(*nparallel)
+
+ pkgs := make([]*Package, *nparallel)
+ pkgs[0] = p
+
+ for n := 1; n < *nparallel; n++ {
+ pkgs[n] = cloneNewPackage(p, n)
+ }
+
+ for n := 0; n < *nparallel; n++ {
+ p := pkgs[n]
+ go func() {
+ doFileWorker(p, jobCh)
+ wg.Done()
+ }()
+ }
+
+ for i := range inputs {
+ jobCh <- doFileJob{
+ input: inputs[i],
+ file: files[i],
}
}
- if !*godefs {
- p.writeDefs()
+ close(jobCh)
+ wg.Wait()
+
+ return pkgs
+}
+
+func doFileWorker(p *Package, jobCh <-chan doFileJob) *Package {
+ for job := range jobCh {
+ doFile(p, job.input, job.file)
}
- if nerrors > 0 {
+
+ return p
+}
+
+func doFile(p *Package, input string, f *File) {
+ p.Translate(f)
+ for _, cref := range f.Ref {
+ switch cref.Context {
+ case ctxCall, ctxCall2:
+ if cref.Name.Kind != "type" {
+ break
+ }
+ old := *cref.Expr
+ *cref.Expr = cref.Name.Type.Go
+ f.Edit.Replace(f.offset(old.Pos()), f.offset(old.End()), gofmt(cref.Name.Type.Go))
+ }
+ }
+ if nerrors.get() > 0 {
os.Exit(2)
}
+ p.PackagePath = f.Package
+ p.Record(f)
+ if *godefs {
+ os.Stdout.WriteString(p.godefs(f))
+ } else {
+ p.writeOutput(f, input)
+ }
+}
+
+func cloneNewPackage(p *Package, workerID int) *Package {
+ return &Package{
+ workerID: workerID,
+ PackageName: p.PackageName,
+ PackagePath: p.PackagePath,
+ PtrSize: p.PtrSize,
+ IntSize: p.IntSize,
+ GccOptions: p.GccOptions, // init in main only
+ GccIsClang: p.GccIsClang,
+ CgoFlags: p.CgoFlags, // init in main only
+ Written: p.Written,
+ }
+}
+
+func coalescePackages(pkgs []*Package) *Package {
+ if len(pkgs) == 0 {
+ return nil
+ }
+
+ nonEmpty := pkgs[:0]
+ for _, p := range pkgs {
+ if p.PackageName != "" {
+ nonEmpty = append(nonEmpty, p)
+ }
+ }
+
+ pkgs = nonEmpty
+ pkg := pkgs[0]
+
+ for _, p := range pkgs[1:] {
+ pkg.PackageName = p.PackageName
+ pkg.PackagePath = p.PackagePath
+ pkg.ExpFunc = append(pkg.ExpFunc, p.ExpFunc...)
+ pkg.Decl = append(pkg.Decl, p.Decl...)
+ pkg.GoFiles = append(pkg.GoFiles, p.GoFiles...)
+ pkg.GccFiles = append(pkg.GccFiles, p.GccFiles...)
+ pkg.Preamble += p.Preamble
+
+ if pkg.Name == nil && p.Name != nil {
+ pkg.Name = p.Name
+ continue
+ }
+
+ for k, v := range p.Name {
+ if o, ok := pkg.Name[k]; ok && !reflect.DeepEqual(v, o) {
+ fatalf("duplicate pkg.Name %s, %v == %v", k, v, o)
+ }
+
+ pkg.Name[k] = v
+ }
+ }
+
+ return pkg
}
// newPackage returns a new Package that will invoke
// gcc with the additional arguments specified in args.
-func newPackage(args []string) *Package {
+func newPackage(args []string, workerID int) *Package {
goarch = runtime.GOARCH
if s := os.Getenv("GOARCH"); s != "" {
goarch = s
@@ -432,10 +567,13 @@ func newPackage(args []string) *Package {
os.Setenv("LC_ALL", "C")
p := &Package{
+ workerID: workerID,
PtrSize: ptrSize,
IntSize: intSize,
CgoFlags: make(map[string][]string),
- Written: make(map[string]bool),
+ Written: &WrittenFiles{
+ written: make(map[string]struct{}),
+ },
}
p.addToFlag("CFLAGS", args)
return p
diff --git a/src/cmd/cgo/out.go b/src/cmd/cgo/out.go
index 4968f7059d9b..b934d12d9423 100644
--- a/src/cmd/cgo/out.go
+++ b/src/cmd/cgo/out.go
@@ -32,14 +32,13 @@ var (
// writeDefs creates output files to be compiled by gc and gcc.
func (p *Package) writeDefs() {
- var fgo2, fc io.Writer
- f := creat(*objDir + "_cgo_gotypes.go")
- defer f.Close()
- fgo2 = f
+ fgo2 := creat(*objDir + "_cgo_gotypes.go")
+ defer fgo2.Close()
+
+ var fc *os.File
if *gccgo {
- f := creat(*objDir + "_cgo_defun.c")
- defer f.Close()
- fc = f
+ fc = creat(*objDir + "_cgo_defun.c")
+ defer fc.Close()
}
fm := creat(*objDir + "_cgo_main.c")
@@ -682,12 +681,11 @@ var isBuiltin = map[string]bool{
func (p *Package) writeOutputFunc(fgcc *os.File, n *Name) {
name := n.Mangle
- if isBuiltin[name] || p.Written[name] {
+ if isBuiltin[name] || !p.Written.Mark(name) {
// The builtins are already defined in the C prolog, and we don't
// want to duplicate function definitions we've already done.
return
}
- p.Written[name] = true
if *gccgo {
p.writeGccgoOutputFunc(fgcc, n)
@@ -1294,7 +1292,7 @@ func (p *Package) writeExportHeader(fgcch io.Writer) {
// gccgoToSymbol converts a name to a mangled symbol for gccgo.
func gccgoToSymbol(ppath string) string {
- if gccgoMangler == nil {
+ gccgoManglerOnce.Do(func() {
var err error
cmd := os.Getenv("GCCGO")
if cmd == "" {
@@ -1307,7 +1305,7 @@ func gccgoToSymbol(ppath string) string {
if err != nil {
fatalf("%v", err)
}
- }
+ })
return gccgoMangler(ppath)
}
diff --git a/src/cmd/cgo/util.go b/src/cmd/cgo/util.go
index 00d931b98a0c..bea77b841466 100644
--- a/src/cmd/cgo/util.go
+++ b/src/cmd/cgo/util.go
@@ -11,6 +11,7 @@ import (
exec "internal/execabs"
"io/ioutil"
"os"
+ "sync/atomic"
)
// run runs the command argv, feeding in stdin on standard input.
@@ -87,16 +88,22 @@ func lineno(pos token.Pos) string {
func fatalf(msg string, args ...interface{}) {
// If we've already printed other errors, they might have
// caused the fatal condition. Assume they're enough.
- if nerrors == 0 {
+ if !nerrors.has() {
fmt.Fprintf(os.Stderr, "cgo: "+msg+"\n", args...)
}
os.Exit(2)
}
-var nerrors int
+type atomicNErrors uint64
+
+var nerrors atomicNErrors
+
+func (n *atomicNErrors) add() { atomic.AddUint64((*uint64)(n), 1) }
+func (n *atomicNErrors) has() bool { return n.get() > 0 }
+func (n *atomicNErrors) get() uint64 { return atomic.LoadUint64((*uint64)(n)) }
func error_(pos token.Pos, msg string, args ...interface{}) {
- nerrors++
+ nerrors.add()
if pos.IsValid() {
fmt.Fprintf(os.Stderr, "%s: ", fset.Position(pos).String())
} else {
diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
index 0af39a991c02..ac658f4803ef 100644
--- a/src/cmd/go/internal/work/exec.go
+++ b/src/cmd/go/internal/work/exec.go
@@ -2821,7 +2821,12 @@ func (b *Builder) cgo(a *Action, cgoExe, objdir string, pcCFLAGS, pcLDFLAGS, cgo
cgoflags = append(cgoflags, "-trimpath", strings.Join(trimpath, ";"))
}
- if err := b.run(a, execdir, p.ImportPath, cgoenv, cfg.BuildToolexec, cgoExe, "-objdir", objdir, "-importpath", p.ImportPath, cgoflags, "--", cgoCPPFLAGS, cgoCFLAGS, cgofiles); err != nil {
+ nparallel := runtime.GOMAXPROCS(0)
+ if nparallel > 4 {
+ nparallel = 4
+ }
+
+ if err := b.run(a, execdir, p.ImportPath, cgoenv, cfg.BuildToolexec, cgoExe, "-nparallel", strconv.Itoa(nparallel), "-objdir", objdir, "-importpath", p.ImportPath, cgoflags, "--", cgoCPPFLAGS, cgoCFLAGS, cgofiles); err != nil {
return nil, nil, err
}
outGo = append(outGo, gofiles...)

159
patches/diamondburned/go/ec3e1c9471f170187b6a7c83ab0364253f895c28.patch Normal file
View File

@ -0,0 +1,159 @@
From ec3e1c9471f170187b6a7c83ab0364253f895c28 Mon Sep 17 00:00:00 2001
From: diamondburned <datutbrus@gmail.com>
Date: Thu, 5 Aug 2021 16:43:01 -0700
Subject: [PATCH] cmd/go/internal/work: concurrent ccompile routines
This commit allows execution of gcc and others after the cgo stage to be
concurrent.
Prior to this change, only 1 gcc instance will run at a time.
After this, these instances will be launched off in multiples at the
same time, where the parallelism is determined by the thread count, but
capped at 4 using gcBackendConcurrency to calculate.
---
src/cmd/go/internal/work/exec.go | 97 +++++++++++++++++++++++++++-----
1 file changed, 82 insertions(+), 15 deletions(-)
diff --git a/src/cmd/go/internal/work/exec.go b/src/cmd/go/internal/work/exec.go
index ac80f503cd89..0af39a991c02 100644
--- a/src/cmd/go/internal/work/exec.go
+++ b/src/cmd/go/internal/work/exec.go
@@ -2838,48 +2838,70 @@ func (b *Builder) cgo(a *Action, cgoExe, objdir string, pcCFLAGS, pcLDFLAGS, cgo
return objdir + fmt.Sprintf("_x%03d.o", oseq)
}
+ jobCh := make(chan func() error)
+ jobErrCh := make(chan error)
+
+ nparallel = gccConcurrency(a)
+ go func() { jobErrCh <- runJobDispatcher(nparallel, jobCh) }()
+
// gcc
cflags := str.StringList(cgoCPPFLAGS, cgoCFLAGS)
for _, cfile := range cfiles {
ofile := nextOfile()
- if err := b.gcc(a, p, a.Objdir, ofile, cflags, objdir+cfile); err != nil {
- return nil, nil, err
- }
+ cfile := cfile
outObj = append(outObj, ofile)
+
+ jobCh <- func() error {
+ return b.gcc(a, p, a.Objdir, ofile, cflags, objdir+cfile)
+ }
}
for _, file := range gccfiles {
ofile := nextOfile()
- if err := b.gcc(a, p, a.Objdir, ofile, cflags, file); err != nil {
- return nil, nil, err
- }
+ ifile := file
outObj = append(outObj, ofile)
+
+ jobCh <- func() error {
+ return b.gcc(a, p, a.Objdir, ofile, cflags, ifile)
+ }
}
cxxflags := str.StringList(cgoCPPFLAGS, cgoCXXFLAGS)
for _, file := range gxxfiles {
ofile := nextOfile()
- if err := b.gxx(a, p, a.Objdir, ofile, cxxflags, file); err != nil {
- return nil, nil, err
- }
+ ifile := file
outObj = append(outObj, ofile)
+
+ jobCh <- func() error {
+ return b.gxx(a, p, a.Objdir, ofile, cxxflags, ifile)
+ }
}
for _, file := range mfiles {
ofile := nextOfile()
- if err := b.gcc(a, p, a.Objdir, ofile, cflags, file); err != nil {
- return nil, nil, err
- }
+ ifile := file
outObj = append(outObj, ofile)
+
+ jobCh <- func() error {
+ return b.gcc(a, p, a.Objdir, ofile, cflags, ifile)
+ }
}
fflags := str.StringList(cgoCPPFLAGS, cgoFFLAGS)
for _, file := range ffiles {
ofile := nextOfile()
- if err := b.gfortran(a, p, a.Objdir, ofile, fflags, file); err != nil {
- return nil, nil, err
- }
+ ifile := file
outObj = append(outObj, ofile)
+
+ jobCh <- func() error {
+ return b.gfortran(a, p, a.Objdir, ofile, fflags, ifile)
+ }
+ }
+
+ close(jobCh)
+
+ if err := <-jobErrCh; err != nil {
+ return nil, nil, err
}
switch cfg.BuildToolchainName {
@@ -2980,6 +3002,51 @@ func (b *Builder) cgo(a *Action, cgoExe, objdir string, pcCFLAGS, pcLDFLAGS, cgo
return outGo, outObj, nil
}
+// gccConcurrency returns the concurrency level for spawning gcc processes.
+func gccConcurrency(a *Action) int {
+ gcflags := str.StringList(forcedGcflags, a.Package.Internal.Gcflags)
+ return gcBackendConcurrency(gcflags)
+}
+
+func runJobDispatcher(nparallel int, jobCh <-chan func() error) error {
+ var wg sync.WaitGroup
+
+ var firstErr error
+ var errNum int
+ var errMut sync.Mutex
+
+ semaphore := make(chan struct{}, nparallel)
+
+ for job := range jobCh {
+ job := job
+
+ wg.Add(1)
+ semaphore <- struct{}{}
+
+ go func() {
+ defer wg.Done()
+ defer func() { <-semaphore }()
+
+ if err := job(); err != nil {
+ errMut.Lock()
+ if firstErr == nil {
+ firstErr = err
+ }
+ errNum++
+ errMut.Unlock()
+ }
+ }()
+ }
+
+ wg.Wait()
+
+ if errNum > 0 {
+ return fmt.Errorf("encountered %d errors, including: %w", errNum, firstErr)
+ }
+
+ return nil
+}
+
// dynimport creates a Go source file named importGo containing
// //go:cgo_import_dynamic directives for each symbol or library
// dynamically imported by the object files outObj.

16
shell.nix Normal file
View File

@ -0,0 +1,16 @@
(
import
(
let
lock = builtins.fromJSON (builtins.readFile ./flake.lock);
in
fetchTarball {
url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
sha256 = lock.nodes.flake-compat.locked.narHash;
}
)
{
src = ./.;
}
)
.shellNix