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// Copyright 2016 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 ld

import (
	"fmt"
	"internal/buildcfg"
	"internal/platform"
)

// A BuildMode indicates the sort of object we are building.
//
// Possible build modes are the same as those for the -buildmode flag
// in cmd/go, and are documented in 'go help buildmode'.
type BuildMode uint8

const (
	BuildModeUnset BuildMode = iota
	BuildModeExe
	BuildModePIE
	BuildModeCArchive
	BuildModeCShared
	BuildModeShared
	BuildModePlugin
)

// Set implements flag.Value to set the build mode based on the argument
// to the -buildmode flag.
func (mode *BuildMode) Set(s string) error {
	switch s {
	default:
		return fmt.Errorf("invalid buildmode: %q", s)
	case "exe":
		switch buildcfg.GOOS + "/" + buildcfg.GOARCH {
		case "darwin/arm64", "windows/arm", "windows/arm64": // On these platforms, everything is PIE
			*mode = BuildModePIE
		default:
			*mode = BuildModeExe
		}
	case "pie":
		*mode = BuildModePIE
	case "c-archive":
		*mode = BuildModeCArchive
	case "c-shared":
		*mode = BuildModeCShared
	case "shared":
		*mode = BuildModeShared
	case "plugin":
		*mode = BuildModePlugin
	}

if !platform.BuildModeSupported("gc", s, buildcfg.GOOS, buildcfg.GOARCH) {
		return fmt.Errorf("buildmode %s not supported on %s/%s", s, buildcfg.GOOS, buildcfg.GOARCH)
	}

return nil
}

func (mode BuildMode) String() string {
	switch mode {
	case BuildModeUnset:
		return "" // avoid showing a default in usage message
	case BuildModeExe:
		return "exe"
	case BuildModePIE:
		return "pie"
	case BuildModeCArchive:
		return "c-archive"
	case BuildModeCShared:
		return "c-shared"
	case BuildModeShared:
		return "shared"
	case BuildModePlugin:
		return "plugin"
	}
	return fmt.Sprintf("BuildMode(%d)", uint8(mode))
}

// LinkMode indicates whether an external linker is used for the final link.
type LinkMode uint8

const (
	LinkAuto LinkMode = iota
	LinkInternal
	LinkExternal
)

func (mode *LinkMode) Set(s string) error {
	switch s {
	default:
		return fmt.Errorf("invalid linkmode: %q", s)
	case "auto":
		*mode = LinkAuto
	case "internal":
		*mode = LinkInternal
	case "external":
		*mode = LinkExternal
	}
	return nil
}

func (mode *LinkMode) String() string {
	switch *mode {
	case LinkAuto:
		return "auto"
	case LinkInternal:
		return "internal"
	case LinkExternal:
		return "external"
	}
	return fmt.Sprintf("LinkMode(%d)", uint8(*mode))
}

// mustLinkExternal reports whether the program being linked requires
// the external linker be used to complete the link.
func mustLinkExternal(ctxt *Link) (res bool, reason string) {
	if ctxt.Debugvlog > 1 {
		defer func() {
			if res {
				ctxt.Logf("external linking is forced by: %s\n", reason)
			}
		}()
	}

if platform.MustLinkExternal(buildcfg.GOOS, buildcfg.GOARCH, false) {
		return true, fmt.Sprintf("%s/%s requires external linking", buildcfg.GOOS, buildcfg.GOARCH)
	}

if *flagMsan {
		return true, "msan"
	}

if *flagAsan {
		return true, "asan"
	}

if iscgo && platform.MustLinkExternal(buildcfg.GOOS, buildcfg.GOARCH, true) {
		return true, buildcfg.GOARCH + " does not support internal cgo"
	}

// Some build modes require work the internal linker cannot do (yet).
	switch ctxt.BuildMode {
	case BuildModeCArchive:
		return true, "buildmode=c-archive"
	case BuildModeCShared:
		return true, "buildmode=c-shared"
	case BuildModePIE:
		if !platform.InternalLinkPIESupported(buildcfg.GOOS, buildcfg.GOARCH) {
			// Internal linking does not support TLS_IE.
			return true, "buildmode=pie"
		}
	case BuildModePlugin:
		return true, "buildmode=plugin"
	case BuildModeShared:
		return true, "buildmode=shared"
	}
	if ctxt.linkShared {
		return true, "dynamically linking with a shared library"
	}

if unknownObjFormat {
		return true, "some input objects have an unrecognized file format"
	}

if len(dynimportfail) > 0 {
		// This error means that we were unable to generate
		// the _cgo_import.go file for some packages.
		// This typically means that there are some dependencies
		// that the cgo tool could not figure out.
		// See issue #52863.
		return true, fmt.Sprintf("some packages could not be built to support internal linking (%v)", dynimportfail)
	}

return false, ""
}

// determineLinkMode sets ctxt.LinkMode.
//
// It is called after flags are processed and inputs are processed,
// so the ctxt.LinkMode variable has an initial value from the -linkmode
// flag and the iscgo, externalobj, and unknownObjFormat variables are set.
func determineLinkMode(ctxt *Link) {
	extNeeded, extReason := mustLinkExternal(ctxt)
	via := ""

if ctxt.LinkMode == LinkAuto {
		// The environment variable GO_EXTLINK_ENABLED controls the
		// default value of -linkmode. If it is not set when the
		// linker is called we take the value it was set to when
		// cmd/link was compiled. (See make.bash.)
		switch buildcfg.Getgoextlinkenabled() {
		case "0":
			ctxt.LinkMode = LinkInternal
			via = "via GO_EXTLINK_ENABLED "
		case "1":
			ctxt.LinkMode = LinkExternal
			via = "via GO_EXTLINK_ENABLED "
		default:
			preferExternal := len(preferlinkext) != 0
			if preferExternal && ctxt.Debugvlog > 0 {
				ctxt.Logf("external linking prefer list is %v\n", preferlinkext)
			}
			if extNeeded || (iscgo && (externalobj || preferExternal)) {
				ctxt.LinkMode = LinkExternal
			} else {
				ctxt.LinkMode = LinkInternal
			}
		}
	}

switch ctxt.LinkMode {
	case LinkInternal:
		if extNeeded {
			Exitf("internal linking requested %sbut external linking required: %s", via, extReason)
		}
	case LinkExternal:
		switch {
		case buildcfg.GOARCH == "ppc64" && buildcfg.GOOS == "linux":
			Exitf("external linking not supported for %s/ppc64", buildcfg.GOOS)
		}
	}
}

Batal

⬅ internal 53 item

Nama	Tipe	Ukuran	Diubah	Aksi
📁testdata	dir	—	2024-02-02 18:09	📂 Buka
🔵ar.go	go	7.2 KB	2024-02-02 18:09	✏️ 👁️
🔵asmb.go	go	5.4 KB	2024-02-02 18:09	✏️ 👁️
🔵config.go	go	5.6 KB	2024-02-02 18:09	✏️ 👁️
🔵data.go	go	99.5 KB	2024-02-02 18:09	✏️ 👁️
🔵data_test.go	go	2.3 KB	2024-02-02 18:09	✏️ 👁️
🔵deadcode.go	go	18.8 KB	2024-02-02 18:09	✏️ 👁️
🔵deadcode_test.go	go	1.7 KB	2024-02-02 18:09	✏️ 👁️
🔵decodesym.go	go	10.1 KB	2024-02-02 18:09	✏️ 👁️
🔵dwarf.go	go	72.4 KB	2024-02-02 18:09	✏️ 👁️
🔵dwarf_test.go	go	48.5 KB	2024-02-02 18:09	✏️ 👁️
🔵elf.go	go	63.2 KB	2024-02-02 18:09	✏️ 👁️
🔵elf_test.go	go	4.2 KB	2024-02-02 18:09	✏️ 👁️
🔵errors.go	go	1.9 KB	2024-02-02 18:09	✏️ 👁️
🔵execarchive.go	go	876 B	2024-02-02 18:09	✏️ 👁️
🔵execarchive_noexec.go	go	320 B	2024-02-02 18:09	✏️ 👁️
🔵fallocate_test.go	go	1.7 KB	2024-02-02 18:09	✏️ 👁️
🔵go.go	go	11.2 KB	2024-02-02 18:09	✏️ 👁️
🔵go_test.go	go	2.7 KB	2024-02-02 18:09	✏️ 👁️
🔵heap.go	go	1.9 KB	2024-02-02 18:09	✏️ 👁️
🔵heap_test.go	go	1.9 KB	2024-02-02 18:09	✏️ 👁️
🔵inittask.go	go	6.2 KB	2024-02-02 18:09	✏️ 👁️
🔵issue33808_test.go	go	792 B	2024-02-02 18:09	✏️ 👁️
🔵ld.go	go	8 KB	2024-02-02 18:09	✏️ 👁️
🔵ld_test.go	go	10.3 KB	2024-02-02 18:09	✏️ 👁️
🔵lib.go	go	86.5 KB	2024-02-02 18:09	✏️ 👁️
🔵link.go	go	5.1 KB	2024-02-02 18:09	✏️ 👁️
🔵macho.go	go	43.7 KB	2024-02-02 18:09	✏️ 👁️
🔵macho_combine_dwarf.go	go	13.1 KB	2024-02-02 18:09	✏️ 👁️
🔵main.go	go	16 KB	2024-02-02 18:09	✏️ 👁️
🔵msync_darwin_libc.go	go	307 B	2024-02-02 18:09	✏️ 👁️
🔵nooptcgolink_test.go	go	733 B	2024-02-02 18:09	✏️ 👁️
🔵outbuf.go	go	8.1 KB	2024-02-02 18:09	✏️ 👁️
🔵outbuf_darwin.go	go	1.3 KB	2024-02-02 18:09	✏️ 👁️
🔵outbuf_freebsd.go	go	515 B	2024-02-02 18:09	✏️ 👁️
🔵outbuf_linux.go	go	304 B	2024-02-02 18:09	✏️ 👁️
🔵outbuf_mmap.go	go	1.5 KB	2024-02-02 18:09	✏️ 👁️
🔵outbuf_nofallocate.go	go	301 B	2024-02-02 18:09	✏️ 👁️
🔵outbuf_nommap.go	go	741 B	2024-02-02 18:09	✏️ 👁️
🔵outbuf_notdarwin.go	go	236 B	2024-02-02 18:09	✏️ 👁️
🔵outbuf_test.go	go	2.2 KB	2024-02-02 18:09	✏️ 👁️
🔵outbuf_windows.go	go	2.3 KB	2024-02-02 18:09	✏️ 👁️
🔵pcln.go	go	29.8 KB	2024-02-02 18:09	✏️ 👁️
🔵pe.go	go	48.8 KB	2024-02-02 18:09	✏️ 👁️
🔵seh.go	go	2 KB	2024-02-02 18:09	✏️ 👁️
🔵stackcheck.go	go	11.9 KB	2024-02-02 18:09	✏️ 👁️
🔵stackcheck_test.go	go	2.2 KB	2024-02-02 18:09	✏️ 👁️
🔵sym.go	go	3.9 KB	2024-02-02 18:09	✏️ 👁️
🔵symtab.go	go	29.2 KB	2024-02-02 18:09	✏️ 👁️
🔵target.go	go	3.9 KB	2024-02-02 18:09	✏️ 👁️
🔵typelink.go	go	1.9 KB	2024-02-02 18:09	✏️ 👁️
🔵util.go	go	2.5 KB	2024-02-02 18:09	✏️ 👁️
🔵xcoff.go	go	51.8 KB	2024-02-02 18:09	✏️ 👁️

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