cmd/link: add array append version of methods

Used by DWARF writer changes in a followup CL.

Change-Id: I6ec40dcfeaba909d9b8f6cf2603bc5b85c1fa873
Reviewed-on: https://go-review.googlesource.com/20073Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/link/internal/amd64/obj.go

@@ -74,6 +74,9 @@ func linkarchinit() {
 	ld.Thearch.Lput = ld.Lputl
 	ld.Thearch.Wput = ld.Wputl
 	ld.Thearch.Vput = ld.Vputl
+	ld.Thearch.Append16 = ld.Append16l
+	ld.Thearch.Append32 = ld.Append32l
+	ld.Thearch.Append64 = ld.Append64l
 
 	ld.Thearch.Linuxdynld = "/lib64/ld-linux-x86-64.so.2"
 	ld.Thearch.Freebsddynld = "/libexec/ld-elf.so.1"

src/cmd/link/internal/arm/obj.go

@@ -70,6 +70,9 @@ func linkarchinit() {
 	ld.Thearch.Lput = ld.Lputl
 	ld.Thearch.Wput = ld.Wputl
 	ld.Thearch.Vput = ld.Vputl
+	ld.Thearch.Append16 = ld.Append16l
+	ld.Thearch.Append32 = ld.Append32l
+	ld.Thearch.Append64 = ld.Append64l
 
 	ld.Thearch.Linuxdynld = "/lib/ld-linux.so.3" // 2 for OABI, 3 for EABI
 	ld.Thearch.Freebsddynld = "/usr/libexec/ld-elf.so.1"

src/cmd/link/internal/arm64/obj.go

@@ -70,6 +70,9 @@ func linkarchinit() {
 	ld.Thearch.Lput = ld.Lputl
 	ld.Thearch.Wput = ld.Wputl
 	ld.Thearch.Vput = ld.Vputl
+	ld.Thearch.Append16 = ld.Append16l
+	ld.Thearch.Append32 = ld.Append32l
+	ld.Thearch.Append64 = ld.Append64l
 
 	ld.Thearch.Linuxdynld = "/lib/ld-linux-aarch64.so.1"
 

src/cmd/link/internal/ld/lib.go

@@ -107,9 +107,12 @@ type Arch struct {
 	Gentext          func()
 	Machoreloc1      func(*Reloc, int64) int
 	PEreloc1         func(*Reloc, int64) bool
-	Lput             func(uint32)
 	Wput             func(uint16)
+	Lput             func(uint32)
 	Vput             func(uint64)
+	Append16         func(b []byte, v uint16) []byte
+	Append32         func(b []byte, v uint32) []byte
+	Append64         func(b []byte, v uint64) []byte
 }
 
 type Rpath struct {

src/cmd/link/internal/ld/symtab.go

@@ -296,6 +296,13 @@ func Wputb(w uint16) {
 	Cput(uint8(w))
 }
 
+func Append16b(b []byte, v uint16) []byte {
+	return append(b, uint8(v>>8), uint8(v))
+}
+func Append16l(b []byte, v uint16) []byte {
+	return append(b, uint8(v), uint8(v>>8))
+}
+
 func Lputb(l uint32) {
 	Cput(uint8(l >> 24))
 	Cput(uint8(l >> 16))
@@ -310,6 +317,13 @@ func Lputl(l uint32) {
 	Cput(uint8(l >> 24))
 }
 
+func Append32b(b []byte, v uint32) []byte {
+	return append(b, uint8(v>>24), uint8(v>>16), uint8(v>>8), uint8(v))
+}
+func Append32l(b []byte, v uint32) []byte {
+	return append(b, uint8(v), uint8(v>>8), uint8(v>>16), uint8(v>>24))
+}
+
 func Vputb(v uint64) {
 	Lputb(uint32(v >> 32))
 	Lputb(uint32(v))
@@ -320,6 +334,18 @@ func Vputl(v uint64) {
 	Lputl(uint32(v >> 32))
 }
 
+func Append64b(b []byte, v uint64) []byte {
+	b = Append32b(b, uint32(v>>32))
+	b = Append32b(b, uint32(v))
+	return b
+}
+
+func Append64l(b []byte, v uint64) []byte {
+	b = Append32l(b, uint32(v))
+	b = Append32l(b, uint32(v>>32))
+	return b
+}
+
 type byPkg []*Library
 
 func (libs byPkg) Len() int {

src/cmd/link/internal/mips64/obj.go

@@ -75,10 +75,16 @@ func linkarchinit() {
 		ld.Thearch.Lput = ld.Lputl
 		ld.Thearch.Wput = ld.Wputl
 		ld.Thearch.Vput = ld.Vputl
+		ld.Thearch.Append16 = ld.Append16l
+		ld.Thearch.Append32 = ld.Append32l
+		ld.Thearch.Append64 = ld.Append64l
 	} else {
 		ld.Thearch.Lput = ld.Lputb
 		ld.Thearch.Wput = ld.Wputb
 		ld.Thearch.Vput = ld.Vputb
+		ld.Thearch.Append16 = ld.Append16b
+		ld.Thearch.Append32 = ld.Append32b
+		ld.Thearch.Append64 = ld.Append64b
 	}
 
 	ld.Thearch.Linuxdynld = "/lib64/ld64.so.1"

src/cmd/link/internal/ppc64/obj.go

@@ -75,10 +75,16 @@ func linkarchinit() {
 		ld.Thearch.Lput = ld.Lputl
 		ld.Thearch.Wput = ld.Wputl
 		ld.Thearch.Vput = ld.Vputl
+		ld.Thearch.Append16 = ld.Append16l
+		ld.Thearch.Append32 = ld.Append32l
+		ld.Thearch.Append64 = ld.Append64l
 	} else {
 		ld.Thearch.Lput = ld.Lputb
 		ld.Thearch.Wput = ld.Wputb
 		ld.Thearch.Vput = ld.Vputb
+		ld.Thearch.Append16 = ld.Append16b
+		ld.Thearch.Append32 = ld.Append32b
+		ld.Thearch.Append64 = ld.Append64b
 	}
 
 	// TODO(austin): ABI v1 uses /usr/lib/ld.so.1

src/cmd/link/internal/x86/obj.go

@@ -71,6 +71,9 @@ func linkarchinit() {
 	ld.Thearch.Lput = ld.Lputl
 	ld.Thearch.Wput = ld.Wputl
 	ld.Thearch.Vput = ld.Vputl
+	ld.Thearch.Append16 = ld.Append16l
+	ld.Thearch.Append32 = ld.Append32l
+	ld.Thearch.Append64 = ld.Append64l
 
 	ld.Thearch.Linuxdynld = "/lib/ld-linux.so.2"
 	ld.Thearch.Freebsddynld = "/usr/libexec/ld-elf.so.1"