From 011e40da85bddf83fee0ded83cb9115b7a88b3d4 Mon Sep 17 00:00:00 2001
From: Shulhan <m.shulhan@gmail.com>
Date: Sat, 26 Oct 2024 00:48:33 +0700
Subject: all: prealloc slice with possible minimum capabilities

---
 src/cmd/internal/edit/edit.go        | 2 +-
 src/cmd/internal/objfile/elf.go      | 2 +-
 src/cmd/internal/objfile/macho.go    | 2 +-
 src/cmd/internal/objfile/pe.go       | 4 ++--
 src/cmd/internal/objfile/plan9obj.go | 4 ++--
 src/cmd/internal/objfile/xcoff.go    | 2 +-
 6 files changed, 8 insertions(+), 8 deletions(-)

(limited to 'src/cmd/internal')

diff --git a/src/cmd/internal/edit/edit.go b/src/cmd/internal/edit/edit.go
index 2d470f4c8a..57c0820eb1 100644
--- a/src/cmd/internal/edit/edit.go
+++ b/src/cmd/internal/edit/edit.go
@@ -71,7 +71,7 @@ func (b *Buffer) Bytes() []byte {
 	// to be applied before a replacement of the text at [x, y).
 	sort.Stable(b.q)
 
-	var new []byte
+	new := make([]byte, 0, len(b.q))
 	offset := 0
 	for i, e := range b.q {
 		if e.start < offset {
diff --git a/src/cmd/internal/objfile/elf.go b/src/cmd/internal/objfile/elf.go
index 6988cea936..bf8d18307c 100644
--- a/src/cmd/internal/objfile/elf.go
+++ b/src/cmd/internal/objfile/elf.go
@@ -32,7 +32,7 @@ func (f *elfFile) symbols() ([]Sym, error) {
 		return nil, err
 	}
 
-	var syms []Sym
+	syms := make([]Sym, 0, len(elfSyms))
 	for _, s := range elfSyms {
 		sym := Sym{Addr: s.Value, Name: s.Name, Size: int64(s.Size), Code: '?'}
 		switch s.Section {
diff --git a/src/cmd/internal/objfile/macho.go b/src/cmd/internal/objfile/macho.go
index eaf665faee..1acb6804d5 100644
--- a/src/cmd/internal/objfile/macho.go
+++ b/src/cmd/internal/objfile/macho.go
@@ -45,7 +45,7 @@ func (f *machoFile) symbols() ([]Sym, error) {
 	}
 	slices.Sort(addrs)
 
-	var syms []Sym
+	syms := make([]Sym, 0, len(f.macho.Symtab.Syms))
 	for _, s := range f.macho.Symtab.Syms {
 		if s.Type&stabTypeMask != 0 {
 			// Skip stab debug info.
diff --git a/src/cmd/internal/objfile/pe.go b/src/cmd/internal/objfile/pe.go
index e94821298f..a0f2456ca3 100644
--- a/src/cmd/internal/objfile/pe.go
+++ b/src/cmd/internal/objfile/pe.go
@@ -30,11 +30,11 @@ func openPE(r io.ReaderAt) (rawFile, error) {
 func (f *peFile) symbols() ([]Sym, error) {
 	// Build sorted list of addresses of all symbols.
 	// We infer the size of a symbol by looking at where the next symbol begins.
-	var addrs []uint64
+	addrs := make([]uint64, 0, len(f.pe.Symbols))
 
 	imageBase, _ := f.imageBase()
 
-	var syms []Sym
+	syms := make([]Sym, 0, len(f.pe.Symbols))
 	for _, s := range f.pe.Symbols {
 		const (
 			N_UNDEF = 0  // An undefined (extern) symbol
diff --git a/src/cmd/internal/objfile/plan9obj.go b/src/cmd/internal/objfile/plan9obj.go
index edd40230ce..648a355f9f 100644
--- a/src/cmd/internal/objfile/plan9obj.go
+++ b/src/cmd/internal/objfile/plan9obj.go
@@ -45,7 +45,7 @@ func (f *plan9File) symbols() ([]Sym, error) {
 
 	// Build sorted list of addresses of all symbols.
 	// We infer the size of a symbol by looking at where the next symbol begins.
-	var addrs []uint64
+	addrs := make([]uint64, 0, len(plan9Syms))
 	for _, s := range plan9Syms {
 		if !validSymType[s.Type] {
 			continue
@@ -54,7 +54,7 @@ func (f *plan9File) symbols() ([]Sym, error) {
 	}
 	slices.Sort(addrs)
 
-	var syms []Sym
+	syms := make([]Sym, 0, len(plan9Syms))
 
 	for _, s := range plan9Syms {
 		if !validSymType[s.Type] {
diff --git a/src/cmd/internal/objfile/xcoff.go b/src/cmd/internal/objfile/xcoff.go
index 85928621f1..f1dc5dafa3 100644
--- a/src/cmd/internal/objfile/xcoff.go
+++ b/src/cmd/internal/objfile/xcoff.go
@@ -27,7 +27,7 @@ func openXcoff(r io.ReaderAt) (rawFile, error) {
 }
 
 func (f *xcoffFile) symbols() ([]Sym, error) {
-	var syms []Sym
+	syms := make([]Sym, 0, len(f.xcoff.Symbols))
 	for _, s := range f.xcoff.Symbols {
 		const (
 			N_UNDEF = 0  // An undefined (extern) symbol
-- 
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