}

// safeExpr returns a safe version of n.
// The definition of safe is that n can appear multiple times
// without violating the semantics of the original program,
// and that assigning to the safe version has the same effect
// as assigning to the original n.
//
// The intended use is to apply to x when rewriting x += y into x = x + y.
func (o *orderState) safeExpr(n ir.Node) ir.Node {
	switch n.Op() {

		// to create duplicate ABI wrappers.
		//
		// However, if it's given a linkname for exporting to
		// C, then we don't make ABI wrappers because the cgo
		// tool wants the original definition.
		hasBody := len(fn.Body) != 0
		if sym.Linkname != "" && (hasBody || hasDefABI) && len(cgoExport) == 0 {
			fn.ABIRefs |= obj.ABISetCallable
		}

		// Double check that cgo-exported symbols don't get

// GoSyscallStart+GoSyscallEnd, unless we observe a GoSysBlock, in which case we
// emit a GoSyscallStart+GoSyscallEndBlocked pair with the correct duration
// (i.e. starting at the original GoSyscall).
//
// The resulting trace treats the old trace as a single, large generation,
// sharing a single evTable for all events.
//
// We use a new (compared to what was used for 'go tool trace' in earlier

//
// Given a value of one of Go's predeclared string, bool, or
// (non-complex) numeric types, AnyValue returns a Value of kind
// [KindString], [KindBool], [KindUint64], [KindInt64], or [KindFloat64].
// The width of the original numeric type is not preserved.
//
// Given a [time.Time] or [time.Duration] value, AnyValue returns a Value of kind
// [KindTime] or [KindDuration]. The monotonic time is not preserved.
//

	// Display options.
	"relative_percentages": helpText(
		"Show percentages relative to focused subgraph",
		"If unset, percentages are relative to full graph before focusing",
		"to facilitate comparison with original graph."),
	"unit": helpText(
		"Measurement units to display",
		"Scale the sample values to this unit.",
		"For time-based profiles, use seconds, milliseconds, nanoseconds, etc.",

// Package constraint implements parsing and evaluation of build constraint lines.
// See https://golang.org/cmd/go/#hdr-Build_constraints for documentation about build constraints themselves.
//
// This package parses both the original “// +build” syntax and the “//go:build” syntax that was added in Go 1.17.
// See https://golang.org/design/draft-gobuild for details about the “//go:build” syntax.
package constraint

import (
	"errors"
	"strings"

		// This allows us to shift farther in the next iteration.
		k *= 2
	}
	// Find first remaining 1.
	// Since we shrunk from the top down, the first 1 is in
	// its correct original position.
	return uint(sys.TrailingZeros64(c))
}

// pallocData encapsulates pallocBits and a bitmap for
// whether or not a given page is scavenged in a single
// structure. It's effectively a pallocBits with

		format(w, p.Filename(), p.Line(), p.Col(), showCol)
		return
	}

	// base is relative
	// Print the column only for the original position since the
	// relative position's column information may be bogus (it's
	// typically generated code and we can't say much about the
	// original source at that point but for the file:line info
	// that's provided via a line directive).

	}
	return modulePath + "/..."
}

// makeGOROOTCopy makes a temporary copy of the current GOROOT tree.
// The goal is to allow the calling test t to safely mutate a GOROOT
// copy without also modifying the original GOROOT.
//
// It copies the entire tree as is, with the exception of the GOROOT/.git
// directory, which is skipped, and the GOROOT/{bin,pkg} directories,

}

// An EnvVar is an environment variable Name=Value.
type EnvVar struct {
	Name    string
	Value   string
	Changed bool // effective Value differs from default
}

// OrigEnv is the original environment of the program at startup.
var OrigEnv []string

// CmdEnv is the new environment for running go tool commands.
// User binaries (during go test or go run) are run with OrigEnv,
// not CmdEnv.