// Methods attached to a *Named type are also instantiated, and associated with
// a new *Func that has the same position as the original method, but nil function
// scope.
//
// If ctxt is non-nil, it may be used to de-duplicate the instance against
// previous instances with the same identity. As a special case, generic
// *Signature origin types are only considered identical if they are pointer
// equivalent, so that instantiating distinct (but possibly identical)

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build unix

package syscall

import (
	"sync/atomic"
)

// origRlimitNofile, if non-nil, is the original soft RLIMIT_NOFILE.
var origRlimitNofile atomic.Pointer[Rlimit]

// Some systems set an artificially low soft limit on open file count, for compatibility
// with code that uses select and its hard-coded maximum file descriptor

		// careful not to call any methods that would cause t to be expanded: doing
		// so would result in deadlock.
		//
		// So we call t.Origin().TypeParams() rather than t.TypeParams().
		orig := t.Origin()
		n := orig.TypeParams().Len()
		if n == 0 {
			return t // type is not parameterized
		}

		if t.TypeArgs().Len() != n {
			return Typ[Invalid] // error reported elsewhere

}

// 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.

		return r.p.tparamIndex[id]

	case instanceType:
		if r.p.exportVersion < iexportVersionGenerics {
			errorf("unexpected instantiation type")
		}
		// pos does not matter for instances: they are positioned on the original
		// type.
		_ = r.pos()
		len := r.uint64()
		targs := make([]types.Type, len)
		for i := range targs {
			targs[i] = r.typ()
		}
		baseType := r.typ()

// origin returns the original uninstantiated symbol for obj.
func origin(obj types.Object) types.Object {
	switch obj := obj.(type) {
	case *types.Var:
		return obj.Origin()
	case *types.Func:
		return obj.Origin()
	case *types.TypeName:
		if named, ok := obj.Type().(*types.Named); ok { // (don't unalias)
			return named.Origin().Obj()
		}
	}
	return obj
}

	}
	// Now, the top bit of each m-aligned group in x is set
	// that group was all zero in the original x.

	// From each group of m bits subtract 1.
	// Because we know only the top bits of each
	// m-aligned group are set, we know this will
	// set each group to have all the bits set except
	// the top bit, so just OR with the original
	// result to set all the bits.
	return ^((x - (x >> (m - 1))) | x)
}

	CompiledImports   []string             // additional Imports necessary when using CompiledGoFiles (all from standard library); 1:1 with the end of PackagePublic.Imports
	RawImports        []string             // this package's original imports as they appear in the text of the program; 1:1 with the end of PackagePublic.Imports
	ForceLibrary      bool                 // this package is a library (even if named "main")

}

type resolver struct {
	localQueries      []*query // queries for absolute or relative paths
	pathQueries       []*query // package path literal queries in original order
	wildcardQueries   []*query // path wildcard queries in original order
	patternAllQueries []*query // queries with the pattern "all"

	// Indexed "none" queries. These are also included in the slices above;

	// function for go:nowritebarrierrec analysis. Only filled in
	// if nowritebarrierrecCheck != nil.
	NWBRCalls *[]SymAndPos

	// For wrapper functions, WrappedFunc point to the original Func.
	// Currently only used for go/defer wrappers.
	WrappedFunc *Func

	// WasmImport is used by the //go:wasmimport directive to store info about
	// a WebAssembly function import.
	WasmImport *WasmImport
}