Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

28 files changed, 420 insertions, 0 deletions

diff --git a/src/internal/goexperiment/exp_arenas_off.go b/src/internal/goexperiment/exp_arenas_off.go
new file mode 100644
index 0000000..9e40ebc
--- /dev/null
+++ b/src/internal/goexperiment/exp_arenas_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.arenas
+// +build !goexperiment.arenas
+
+package goexperiment
+
+const Arenas = false
+const ArenasInt = 0
diff --git a/src/internal/goexperiment/exp_arenas_on.go b/src/internal/goexperiment/exp_arenas_on.go
new file mode 100644
index 0000000..92ef748
--- /dev/null
+++ b/src/internal/goexperiment/exp_arenas_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.arenas
+// +build goexperiment.arenas
+
+package goexperiment
+
+const Arenas = true
+const ArenasInt = 1
diff --git a/src/internal/goexperiment/exp_boringcrypto_off.go b/src/internal/goexperiment/exp_boringcrypto_off.go
new file mode 100644
index 0000000..020c75b
--- /dev/null
+++ b/src/internal/goexperiment/exp_boringcrypto_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.boringcrypto
+// +build !goexperiment.boringcrypto
+
+package goexperiment
+
+const BoringCrypto = false
+const BoringCryptoInt = 0
diff --git a/src/internal/goexperiment/exp_boringcrypto_on.go b/src/internal/goexperiment/exp_boringcrypto_on.go
new file mode 100644
index 0000000..1454329
--- /dev/null
+++ b/src/internal/goexperiment/exp_boringcrypto_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.boringcrypto
+// +build goexperiment.boringcrypto
+
+package goexperiment
+
+const BoringCrypto = true
+const BoringCryptoInt = 1
diff --git a/src/internal/goexperiment/exp_cacheprog_off.go b/src/internal/goexperiment/exp_cacheprog_off.go
new file mode 100644
index 0000000..29aa869
--- /dev/null
+++ b/src/internal/goexperiment/exp_cacheprog_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.cacheprog
+// +build !goexperiment.cacheprog
+
+package goexperiment
+
+const CacheProg = false
+const CacheProgInt = 0
diff --git a/src/internal/goexperiment/exp_cacheprog_on.go b/src/internal/goexperiment/exp_cacheprog_on.go
new file mode 100644
index 0000000..121b299
--- /dev/null
+++ b/src/internal/goexperiment/exp_cacheprog_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.cacheprog
+// +build goexperiment.cacheprog
+
+package goexperiment
+
+const CacheProg = true
+const CacheProgInt = 1
diff --git a/src/internal/goexperiment/exp_cgocheck2_off.go b/src/internal/goexperiment/exp_cgocheck2_off.go
new file mode 100644
index 0000000..77aa538
--- /dev/null
+++ b/src/internal/goexperiment/exp_cgocheck2_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.cgocheck2
+// +build !goexperiment.cgocheck2
+
+package goexperiment
+
+const CgoCheck2 = false
+const CgoCheck2Int = 0
diff --git a/src/internal/goexperiment/exp_cgocheck2_on.go b/src/internal/goexperiment/exp_cgocheck2_on.go
new file mode 100644
index 0000000..6201249
--- /dev/null
+++ b/src/internal/goexperiment/exp_cgocheck2_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.cgocheck2
+// +build goexperiment.cgocheck2
+
+package goexperiment
+
+const CgoCheck2 = true
+const CgoCheck2Int = 1
diff --git a/src/internal/goexperiment/exp_coverageredesign_off.go b/src/internal/goexperiment/exp_coverageredesign_off.go
new file mode 100644
index 0000000..95d3a6c
--- /dev/null
+++ b/src/internal/goexperiment/exp_coverageredesign_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.coverageredesign
+// +build !goexperiment.coverageredesign
+
+package goexperiment
+
+const CoverageRedesign = false
+const CoverageRedesignInt = 0
diff --git a/src/internal/goexperiment/exp_coverageredesign_on.go b/src/internal/goexperiment/exp_coverageredesign_on.go
new file mode 100644
index 0000000..330a234
--- /dev/null
+++ b/src/internal/goexperiment/exp_coverageredesign_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.coverageredesign
+// +build goexperiment.coverageredesign
+
+package goexperiment
+
+const CoverageRedesign = true
+const CoverageRedesignInt = 1
diff --git a/src/internal/goexperiment/exp_fieldtrack_off.go b/src/internal/goexperiment/exp_fieldtrack_off.go
new file mode 100644
index 0000000..e5e1326
--- /dev/null
+++ b/src/internal/goexperiment/exp_fieldtrack_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.fieldtrack
+// +build !goexperiment.fieldtrack
+
+package goexperiment
+
+const FieldTrack = false
+const FieldTrackInt = 0
diff --git a/src/internal/goexperiment/exp_fieldtrack_on.go b/src/internal/goexperiment/exp_fieldtrack_on.go
new file mode 100644
index 0000000..0d8c447
--- /dev/null
+++ b/src/internal/goexperiment/exp_fieldtrack_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.fieldtrack
+// +build goexperiment.fieldtrack
+
+package goexperiment
+
+const FieldTrack = true
+const FieldTrackInt = 1
diff --git a/src/internal/goexperiment/exp_heapminimum512kib_off.go b/src/internal/goexperiment/exp_heapminimum512kib_off.go
new file mode 100644
index 0000000..09da431
--- /dev/null
+++ b/src/internal/goexperiment/exp_heapminimum512kib_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.heapminimum512kib
+// +build !goexperiment.heapminimum512kib
+
+package goexperiment
+
+const HeapMinimum512KiB = false
+const HeapMinimum512KiBInt = 0
diff --git a/src/internal/goexperiment/exp_heapminimum512kib_on.go b/src/internal/goexperiment/exp_heapminimum512kib_on.go
new file mode 100644
index 0000000..bab684b
--- /dev/null
+++ b/src/internal/goexperiment/exp_heapminimum512kib_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.heapminimum512kib
+// +build goexperiment.heapminimum512kib
+
+package goexperiment
+
+const HeapMinimum512KiB = true
+const HeapMinimum512KiBInt = 1
diff --git a/src/internal/goexperiment/exp_loopvar_off.go b/src/internal/goexperiment/exp_loopvar_off.go
new file mode 100644
index 0000000..1cd7ee1
--- /dev/null
+++ b/src/internal/goexperiment/exp_loopvar_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.loopvar
+// +build !goexperiment.loopvar
+
+package goexperiment
+
+const LoopVar = false
+const LoopVarInt = 0
diff --git a/src/internal/goexperiment/exp_loopvar_on.go b/src/internal/goexperiment/exp_loopvar_on.go
new file mode 100644
index 0000000..e3c8980
--- /dev/null
+++ b/src/internal/goexperiment/exp_loopvar_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.loopvar
+// +build goexperiment.loopvar
+
+package goexperiment
+
+const LoopVar = true
+const LoopVarInt = 1
diff --git a/src/internal/goexperiment/exp_pagetrace_off.go b/src/internal/goexperiment/exp_pagetrace_off.go
new file mode 100644
index 0000000..789e883
--- /dev/null
+++ b/src/internal/goexperiment/exp_pagetrace_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.pagetrace
+// +build !goexperiment.pagetrace
+
+package goexperiment
+
+const PageTrace = false
+const PageTraceInt = 0
diff --git a/src/internal/goexperiment/exp_pagetrace_on.go b/src/internal/goexperiment/exp_pagetrace_on.go
new file mode 100644
index 0000000..ea72b54
--- /dev/null
+++ b/src/internal/goexperiment/exp_pagetrace_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.pagetrace
+// +build goexperiment.pagetrace
+
+package goexperiment
+
+const PageTrace = true
+const PageTraceInt = 1
diff --git a/src/internal/goexperiment/exp_preemptibleloops_off.go b/src/internal/goexperiment/exp_preemptibleloops_off.go
new file mode 100644
index 0000000..7a26088
--- /dev/null
+++ b/src/internal/goexperiment/exp_preemptibleloops_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.preemptibleloops
+// +build !goexperiment.preemptibleloops
+
+package goexperiment
+
+const PreemptibleLoops = false
+const PreemptibleLoopsInt = 0
diff --git a/src/internal/goexperiment/exp_preemptibleloops_on.go b/src/internal/goexperiment/exp_preemptibleloops_on.go
new file mode 100644
index 0000000..a9ca28c
--- /dev/null
+++ b/src/internal/goexperiment/exp_preemptibleloops_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.preemptibleloops
+// +build goexperiment.preemptibleloops
+
+package goexperiment
+
+const PreemptibleLoops = true
+const PreemptibleLoopsInt = 1
diff --git a/src/internal/goexperiment/exp_regabiargs_off.go b/src/internal/goexperiment/exp_regabiargs_off.go
new file mode 100644
index 0000000..31a139b
--- /dev/null
+++ b/src/internal/goexperiment/exp_regabiargs_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.regabiargs
+// +build !goexperiment.regabiargs
+
+package goexperiment
+
+const RegabiArgs = false
+const RegabiArgsInt = 0
diff --git a/src/internal/goexperiment/exp_regabiargs_on.go b/src/internal/goexperiment/exp_regabiargs_on.go
new file mode 100644
index 0000000..9b26f3c
--- /dev/null
+++ b/src/internal/goexperiment/exp_regabiargs_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.regabiargs
+// +build goexperiment.regabiargs
+
+package goexperiment
+
+const RegabiArgs = true
+const RegabiArgsInt = 1
diff --git a/src/internal/goexperiment/exp_regabiwrappers_off.go b/src/internal/goexperiment/exp_regabiwrappers_off.go
new file mode 100644
index 0000000..bfa0fa3
--- /dev/null
+++ b/src/internal/goexperiment/exp_regabiwrappers_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.regabiwrappers
+// +build !goexperiment.regabiwrappers
+
+package goexperiment
+
+const RegabiWrappers = false
+const RegabiWrappersInt = 0
diff --git a/src/internal/goexperiment/exp_regabiwrappers_on.go b/src/internal/goexperiment/exp_regabiwrappers_on.go
new file mode 100644
index 0000000..11ffffb
--- /dev/null
+++ b/src/internal/goexperiment/exp_regabiwrappers_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.regabiwrappers
+// +build goexperiment.regabiwrappers
+
+package goexperiment
+
+const RegabiWrappers = true
+const RegabiWrappersInt = 1
diff --git a/src/internal/goexperiment/exp_staticlockranking_off.go b/src/internal/goexperiment/exp_staticlockranking_off.go
new file mode 100644
index 0000000..3d546c0
--- /dev/null
+++ b/src/internal/goexperiment/exp_staticlockranking_off.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.staticlockranking
+// +build !goexperiment.staticlockranking
+
+package goexperiment
+
+const StaticLockRanking = false
+const StaticLockRankingInt = 0
diff --git a/src/internal/goexperiment/exp_staticlockranking_on.go b/src/internal/goexperiment/exp_staticlockranking_on.go
new file mode 100644
index 0000000..78188fb
--- /dev/null
+++ b/src/internal/goexperiment/exp_staticlockranking_on.go
@@ -0,0 +1,9 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.staticlockranking
+// +build goexperiment.staticlockranking
+
+package goexperiment
+
+const StaticLockRanking = true
+const StaticLockRankingInt = 1
diff --git a/src/internal/goexperiment/flags.go b/src/internal/goexperiment/flags.go
new file mode 100644
index 0000000..ae3cbaf
--- /dev/null
+++ b/src/internal/goexperiment/flags.go
@@ -0,0 +1,112 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// 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 goexperiment
+
+//go:generate go run mkconsts.go
+
+// 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".
+type Flags struct {
+	FieldTrack        bool
+	PreemptibleLoops  bool
+	StaticLockRanking bool
+	BoringCrypto      bool
+
+	// Regabi is split into several sub-experiments that can be
+	// enabled individually. Not all combinations work.
+	// The "regabi" GOEXPERIMENT is an alias for all "working"
+	// subexperiments.
+
+	// 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
+
+	// CoverageRedesign enables the new compiler-based code coverage
+	// tooling.
+	CoverageRedesign bool
+
+	// Arenas causes the "arena" standard library package to be visible
+	// to the outside world.
+	Arenas bool
+
+	// 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.
+	PageTrace bool
+
+	// 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.
+	CgoCheck2 bool
+
+	// LoopVar changes loop semantics so that each iteration gets its own
+	// copy of the iteration variable.
+	LoopVar 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.
+	CacheProg bool
+}
diff --git a/src/internal/goexperiment/mkconsts.go b/src/internal/goexperiment/mkconsts.go
new file mode 100644
index 0000000..204ca9d
--- /dev/null
+++ b/src/internal/goexperiment/mkconsts.go
@@ -0,0 +1,74 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build ignore
+// +build ignore
+
+// mkconsts generates const definition files for each GOEXPERIMENT.
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"internal/goexperiment"
+	"log"
+	"os"
+	"reflect"
+	"strings"
+)
+
+func main() {
+	// Delete existing experiment constant files.
+	ents, err := os.ReadDir(".")
+	if err != nil {
+		log.Fatal(err)
+	}
+	for _, ent := range ents {
+		name := ent.Name()
+		if !strings.HasPrefix(name, "exp_") {
+			continue
+		}
+		// Check that this is definitely a generated file.
+		data, err := os.ReadFile(name)
+		if err != nil {
+			log.Fatalf("reading %s: %v", name, err)
+		}
+		if !bytes.Contains(data, []byte("Code generated by mkconsts")) {
+			log.Fatalf("%s: expected generated file", name)
+		}
+		if err := os.Remove(name); err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	// Generate new experiment constant files.
+	rt := reflect.TypeOf(&goexperiment.Flags{}).Elem()
+	for i := 0; i < rt.NumField(); i++ {
+		f := rt.Field(i).Name
+		buildTag := "goexperiment." + strings.ToLower(f)
+		for _, val := range []bool{false, true} {
+			name := fmt.Sprintf("exp_%s_%s.go", strings.ToLower(f), pick(val, "off", "on"))
+			data := fmt.Sprintf(`// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build %s%s
+// +build %s%s
+
+package goexperiment
+
+const %s = %v
+const %sInt = %s
+`, pick(val, "!", ""), buildTag, pick(val, "!", ""), buildTag, f, val, f, pick(val, "0", "1"))
+			if err := os.WriteFile(name, []byte(data), 0666); err != nil {
+				log.Fatalf("writing %s: %v", name, err)
+			}
+		}
+	}
+}
+
+func pick(v bool, f, t string) string {
+	if v {
+		return t
+	}
+	return f
+}