goexperiment

package standard library
Version: master (de95dca) Latest Latest
Warning

This package is not in the latest version of its module.

Go to latest
Published: Aug 10, 2022 License: BSD-3-Clause Imports: 0 Imported by: 0

Documentation

Overview

Package goexperiment implements support for toolchain experiments.

Toolchain experiments are controlled by the GOEXPERIMENT environment variable. GOEXPERIMENT is a comma-separated list of experiment names. GOEXPERIMENT can be set at make.bash time, which sets the default experiments for binaries built with the tool chain; or it can be set at build time. GOEXPERIMENT can also be set to "none", which disables any experiments that were enabled at make.bash time.

Experiments are exposed to the build in the following ways:

- Build tag goexperiment.x is set if experiment x (lower case) is enabled.

- For each experiment x (in camel case), this package contains a boolean constant x and an integer constant xInt.

- In runtime assembly, the macro GOEXPERIMENT_x is defined if experiment x (lower case) is enabled.

In the toolchain, the set of experiments enabled for the current build should be accessed via objabi.Experiment.

The set of experiments is included in the output of runtime.Version() and "go version <binary>" if it differs from the default experiments.

For the set of experiments supported by the current toolchain, see "go doc goexperiment.Flags".

Note that this package defines the set of experiments (in Flags) and records the experiments that were enabled when the package was compiled (as boolean and integer constants).

Note especially that this package does not itself change behavior at run time based on the GOEXPERIMENT variable. The code used in builds to interpret the GOEXPERIMENT variable is in the separate package internal/buildcfg.

Index

Constants

View Source
const BoringCrypto = false
View Source
const BoringCryptoInt = 0
View Source
const FieldTrack = false
View Source
const FieldTrackInt = 0
View Source
const HeapMinimum512KiB = false
View Source
const HeapMinimum512KiBInt = 0
View Source
const PreemptibleLoops = false
View Source
const PreemptibleLoopsInt = 0
View Source
const RegabiArgs = false
View Source
const RegabiArgsInt = 0
View Source
const RegabiWrappers = false
View Source
const RegabiWrappersInt = 0
View Source
const StaticLockRanking = false
View Source
const StaticLockRankingInt = 0
View Source
const Unified = false
View Source
const UnifiedInt = 0

Variables

This section is empty.

Functions

This section is empty.

Types

type Flags

type Flags struct {
	FieldTrack        bool
	PreemptibleLoops  bool
	StaticLockRanking bool
	BoringCrypto      bool

	// Unified enables the compiler's unified IR construction
	// experiment.
	Unified bool

	// RegabiWrappers enables ABI wrappers for calling between
	// ABI0 and ABIInternal functions. Without this, the ABIs are
	// assumed to be identical so cross-ABI calls are direct.
	RegabiWrappers bool
	// RegabiArgs enables register arguments/results in all
	// compiled Go functions.
	//
	// Requires wrappers (to do ABI translation), and reflect (so
	// reflection calls use registers).
	RegabiArgs bool

	// HeapMinimum512KiB reduces the minimum heap size to 512 KiB.
	//
	// This was originally reduced as part of PacerRedesign, but
	// has been broken out to its own experiment that is disabled
	// by default.
	HeapMinimum512KiB bool
}

Flags is the set of experiments that can be enabled or disabled in the current toolchain.

When specified in the GOEXPERIMENT environment variable or as build tags, experiments use the strings.ToLower of their field name.

For the baseline experimental configuration, see objabi.experimentBaseline.

If you change this struct definition, run "go generate".

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL