// Copyright 2023 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.

// This file contains various functionality that is
// different between go/types and types2. Factoring
// out this code allows more of the rest of the code
// to be shared.

package types2

import (
	"cmd/compile/internal/syntax"
	"go/constant"
	"go/token"
)

// explicit user init functions and implicit compiler-generated
// init functions for initializing global variables like maps.
//
// In addition, inittask records have dependencies between each
// other, mirroring the import dependencies. So if package p
// imports package q, then there will be a dependency p -> q.
// We can't initialize package p until after package q has
// already been initialized.
//

	// initDefaultCache. cmd/go/main.go explicitly sets GOCACHE so that
	// subprocesses will inherit it, but that means initDefaultCache can't
	// otherwise distinguish between an explicit "off" and a UserCacheDir error.

	defaultDirOnce.Do(func() {
		defaultDir = cfg.Getenv("GOCACHE")
		if defaultDir != "" {
			defaultDirChanged = true
			if filepath.IsAbs(defaultDir) || defaultDir == "off" {

// clients can record relations between SSA values using SetOrder, and later
// check relations (in the transitive closure) with Ordered. For instance,
// if SetOrder is called to record that A<B and B<C, Ordered will later confirm
// that A<C.
//
// It is possible to record equality relations between SSA values with SetEqual and check

			}
			defer elfpie.Close()

			// The difference in size between exe and PIE
			// should be approximately the difference in
			// size of the .text section plus the size of
			// the PIE dynamic data sections plus the
			// difference in size of the .got and .plt
			// sections if they exist.
			// We ignore unallocated sections.
			// There may be gaps between non-writeable and
			// writable PT_LOAD segments. We also skip those

		return i
	}
	return j
}

// TEMPORARY until bootstrap version catches up.
func imax(i, j int) int {
	if i > j {
		return i
	}
	return j
}

// Overlaps returns true if here is any overlap between i and i2.
func (i Interval) Overlaps(i2 Interval) bool {
	return (imin(i.en, i2.en) - imax(i.st, i2.st)) > 0
}

// adjacent returns true if the start of one interval is equal to the

	// value of this is "0": we can't distinguish between
	// references to data and ABI0 text symbols in assembly code,
	// and hence this doesn't distinguish between symbols without
	// an ABI and text symbols with ABI0.
	ABI0 ABI = iota

	// ABIInternal is the internal ABI that may change between Go
	// versions. All Go functions use the internal ABI and the

		if len(b.Values) != nv {
			f.Fatalf("schedule does not include all values in block %s", b)
		}
	}

	// Remove SPanchored now that we've scheduled.
	// Also unlink nil checks now that ordering is assured
	// between the nil check and the uses of the nil-checked pointer.
	for _, b := range f.Blocks {
		for _, v := range b.Values {
			for i, a := range v.Args {
				if a.Op == OpSPanchored || opcodeTable[a.Op].nilCheck {

		return "", "", s, ErrHeader
	}
	n -= int64(len(nStr) + 1) // convert from index in s to index in rest
	if n <= 0 {
		return "", "", s, ErrHeader
	}

	// Extract everything between the space and the final newline.
	rec, nl, rem := rest[:n-1], rest[n-1:n], rest[n:]
	if nl != "\n" {
		return "", "", s, ErrHeader
	}

	// The first equals separates the key from the value.

	assertOp(n, ir.OAPPEND)
	if hasRType(n, n.RType, "RType") {
		return n.RType
	}
	return sliceElemRType(pos, n.Type())
}

// CompareRType asserts that n is a comparison (== or !=) operation
// between expressions of interface and non-interface type, and
// returns an expression that yields the *runtime._type value
// representing the non-interface type.
func CompareRType(pos src.XPos, n *ir.BinaryExpr) ir.Node {