package goexperiment

Import Path
	internal/goexperiment (on go.dev)

Dependency Relation
	imports 0 packages, and imported by 3 packages


Involved Source Files

	    exp_allocheaders_on.go
	    exp_arenas_on.go
	    exp_boringcrypto_off.go
	    exp_cacheprog_off.go
	    exp_cgocheck2_off.go
	    exp_coverageredesign_on.go
	    exp_exectracer2_on.go
	    exp_fieldtrack_off.go
	    exp_heapminimum512kib_off.go
	    exp_loopvar_off.go
	    exp_newinliner_off.go
	    exp_pagetrace_off.go
	    exp_preemptibleloops_off.go
	    exp_rangefunc_off.go
	    exp_regabiargs_on.go
	    exp_regabiwrappers_on.go
	    exp_staticlockranking_off.go
	
		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.


Package-Level Type Names (only one)


	/* sort by:  |  */
	
		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".

		
			
				AllocHeaders enables a different, more efficient way for the GC to
				manage heap metadata.

			
				Arenas causes the "arena" standard library package to be visible
				to the outside world.

			BoringCrypto bool
			
				CacheProg adds support to cmd/go to use a child process to implement
				the build cache; see https://github.com/golang/go/issues/59719.

			
				CgoCheck2 enables an expensive cgo rule checker.
				When this experiment is enabled, cgo rule checks occur regardless
				of the GODEBUG=cgocheck setting provided at runtime.

			
				CoverageRedesign enables the new compiler-based code coverage
				tooling.

			
				ExecTracer2 controls whether to use the new execution trace
				implementation.

			FieldTrack 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.

			
				LoopVar changes loop semantics so that each iteration gets its own
				copy of the iteration variable.

			
				NewInliner enables a new+improved version of the function
				inlining phase within the Go compiler.

			
				PageTrace enables GODEBUG=pagetrace=/path/to/result. This feature
				is a GOEXPERIMENT due to a security risk with setuid binaries:
				this compels the Go runtime to write to some arbitrary file, which
				may be exploited.

			PreemptibleLoops bool
			
				Range enables range over int and func.

			
				RangeFunc enables range over func.

			
				RegabiArgs enables register arguments/results in all
				compiled Go functions.
				
				Requires wrappers (to do ABI translation), and reflect (so
				reflection calls use registers).

			
				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.

			StaticLockRanking bool




Package-Level Constants (total 34)


	const AllocHeaders = true
	const AllocHeadersInt = 1
	const Arenas = true
	const ArenasInt = 1
	const BoringCrypto = false
	const BoringCryptoInt = 0
	const CacheProg = false
	const CacheProgInt = 0
	const CgoCheck2 = false
	const CgoCheck2Int = 0
	const CoverageRedesign = true
	const ExecTracer2 = true
	const ExecTracer2Int = 1
	const FieldTrack = false
	const FieldTrackInt = 0
	const HeapMinimum512KiB = false
	const LoopVar = false
	const LoopVarInt = 0
	const NewInliner = false
	const NewInlinerInt = 0
	const PageTrace = false
	const PageTraceInt = 0
	const PreemptibleLoops = false
	const RangeFunc = false
	const RangeFuncInt = 0
	const RegabiArgs = true
	const RegabiArgsInt = 1
	const RegabiWrappers = true
	const StaticLockRanking = false