cmd/compile/internal: clean up galign.go constants

Move the C header style architecture constants to the per arch Main
methods.

Change-Id: Ie7ff39baa275ceaa6680e7d16441ca9f0aa12597
Reviewed-on: https://go-review.googlesource.com/20722Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/compile/internal/amd64/galign.go

@@ -11,9 +11,12 @@ import (
 )
 
 var (
-	thechar     int           = '6'
-	thestring   string        = "amd64"
-	thelinkarch *obj.LinkArch = &x86.Linkamd64
+	thestring   = "amd64"
+	thelinkarch = &x86.Linkamd64
+	addptr      = x86.AADDQ
+	movptr      = x86.AMOVQ
+	leaptr      = x86.ALEAQ
+	cmpptr      = x86.ACMPQ
 )
 
 func linkarchinit() {
@@ -25,15 +28,6 @@ func linkarchinit() {
 	}
 }
 
-var MAXWIDTH int64 = 1 << 50
-
-var (
-	addptr = x86.AADDQ
-	movptr = x86.AMOVQ
-	leaptr = x86.ALEAQ
-	cmpptr = x86.ACMPQ
-)
-
 func betypeinit() {
 	gc.Widthptr = 8
 	gc.Widthint = 8
@@ -59,7 +53,7 @@ func Main() {
 		resvd = append(resvd, x86.REG_BP)
 	}
 
-	gc.Thearch.Thechar = thechar
+	gc.Thearch.Thechar = '6'
 	gc.Thearch.Thestring = thestring
 	gc.Thearch.Thelinkarch = thelinkarch
 	gc.Thearch.REGSP = x86.REGSP
@@ -71,7 +65,7 @@ func Main() {
 	gc.Thearch.REGMAX = x86.REG_R15
 	gc.Thearch.FREGMIN = x86.REG_X0
 	gc.Thearch.FREGMAX = x86.REG_X15
-	gc.Thearch.MAXWIDTH = MAXWIDTH
+	gc.Thearch.MAXWIDTH = 1 << 50
 	gc.Thearch.ReservedRegs = resvd
 
 	gc.Thearch.AddIndex = addindex

src/cmd/compile/internal/arm/galign.go

@@ -6,21 +6,12 @@ package arm
 
 import (
 	"cmd/compile/internal/gc"
-	"cmd/internal/obj"
 	"cmd/internal/obj/arm"
 )
 
-var thechar int = '5'
-
-var thestring string = "arm"
-
-var thelinkarch *obj.LinkArch = &arm.Linkarm
-
 func linkarchinit() {
 }
 
-var MAXWIDTH int64 = (1 << 32) - 1
-
 func betypeinit() {
 	gc.Widthptr = 4
 	gc.Widthint = 4
@@ -28,9 +19,9 @@ func betypeinit() {
 }
 
 func Main() {
-	gc.Thearch.Thechar = thechar
-	gc.Thearch.Thestring = thestring
-	gc.Thearch.Thelinkarch = thelinkarch
+	gc.Thearch.Thechar = '5'
+	gc.Thearch.Thestring = "arm"
+	gc.Thearch.Thelinkarch = &arm.Linkarm
 	gc.Thearch.REGSP = arm.REGSP
 	gc.Thearch.REGCTXT = arm.REGCTXT
 	gc.Thearch.REGCALLX = arm.REG_R1
@@ -40,7 +31,7 @@ func Main() {
 	gc.Thearch.REGMAX = arm.REGEXT
 	gc.Thearch.FREGMIN = arm.REG_F0
 	gc.Thearch.FREGMAX = arm.FREGEXT
-	gc.Thearch.MAXWIDTH = MAXWIDTH
+	gc.Thearch.MAXWIDTH = (1 << 32) - 1
 	gc.Thearch.ReservedRegs = resvd
 
 	gc.Thearch.Betypeinit = betypeinit

src/cmd/compile/internal/arm64/galign.go

@@ -6,21 +6,12 @@ package arm64
 
 import (
 	"cmd/compile/internal/gc"
-	"cmd/internal/obj"
 	"cmd/internal/obj/arm64"
 )
 
-var thechar int = '7'
-
-var thestring string = "arm64"
-
-var thelinkarch *obj.LinkArch = &arm64.Linkarm64
-
 func linkarchinit() {
 }
 
-var MAXWIDTH int64 = 1 << 50
-
 func betypeinit() {
 	gc.Widthptr = 8
 	gc.Widthint = 8
@@ -28,9 +19,9 @@ func betypeinit() {
 }
 
 func Main() {
-	gc.Thearch.Thechar = thechar
-	gc.Thearch.Thestring = thestring
-	gc.Thearch.Thelinkarch = thelinkarch
+	gc.Thearch.Thechar = '7'
+	gc.Thearch.Thestring = "arm64"
+	gc.Thearch.Thelinkarch = &arm64.Linkarm64
 	gc.Thearch.REGSP = arm64.REGSP
 	gc.Thearch.REGCTXT = arm64.REGCTXT
 	gc.Thearch.REGCALLX = arm64.REGRT1
@@ -41,7 +32,7 @@ func Main() {
 	gc.Thearch.REGZERO = arm64.REGZERO
 	gc.Thearch.FREGMIN = arm64.REG_F0
 	gc.Thearch.FREGMAX = arm64.REG_F31
-	gc.Thearch.MAXWIDTH = MAXWIDTH
+	gc.Thearch.MAXWIDTH = 1 << 50
 	gc.Thearch.ReservedRegs = resvd
 
 	gc.Thearch.Betypeinit = betypeinit

src/cmd/compile/internal/mips64/galign.go

@@ -10,11 +10,10 @@ import (
 	"cmd/internal/obj/mips"
 )
 
-var thechar int = '0'
-
-var thestring string = "mips64"
-
-var thelinkarch *obj.LinkArch
+var (
+	thestring   = "mips64"
+	thelinkarch *obj.LinkArch
+)
 
 func linkarchinit() {
 	thestring = obj.Getgoarch()
@@ -27,8 +26,6 @@ func linkarchinit() {
 	gc.Thearch.Thelinkarch = thelinkarch
 }
 
-var MAXWIDTH int64 = 1 << 50
-
 func betypeinit() {
 	gc.Widthptr = 8
 	gc.Widthint = 8
@@ -36,7 +33,7 @@ func betypeinit() {
 }
 
 func Main() {
-	gc.Thearch.Thechar = thechar
+	gc.Thearch.Thechar = '0'
 	gc.Thearch.Thestring = thestring
 	gc.Thearch.Thelinkarch = thelinkarch
 	gc.Thearch.REGSP = mips.REGSP
@@ -48,7 +45,7 @@ func Main() {
 	gc.Thearch.REGMAX = mips.REG_R31
 	gc.Thearch.FREGMIN = mips.REG_F0
 	gc.Thearch.FREGMAX = mips.REG_F31
-	gc.Thearch.MAXWIDTH = MAXWIDTH
+	gc.Thearch.MAXWIDTH = 1 << 50
 	gc.Thearch.ReservedRegs = resvd
 
 	gc.Thearch.Betypeinit = betypeinit

src/cmd/compile/internal/ppc64/galign.go

@@ -10,11 +10,10 @@ import (
 	"cmd/internal/obj/ppc64"
 )
 
-var thechar int = '9'
-
-var thestring string = "ppc64"
-
-var thelinkarch *obj.LinkArch
+var (
+	thestring   = "ppc64"
+	thelinkarch *obj.LinkArch
+)
 
 func linkarchinit() {
 	thestring = obj.Getgoarch()
@@ -27,8 +26,6 @@ func linkarchinit() {
 	gc.Thearch.Thelinkarch = thelinkarch
 }
 
-var MAXWIDTH int64 = 1 << 50
-
 func betypeinit() {
 	gc.Widthptr = 8
 	gc.Widthint = 8
@@ -41,7 +38,7 @@ func betypeinit() {
 }
 
 func Main() {
-	gc.Thearch.Thechar = thechar
+	gc.Thearch.Thechar = '9'
 	gc.Thearch.Thestring = thestring
 	gc.Thearch.Thelinkarch = thelinkarch
 	gc.Thearch.REGSP = ppc64.REGSP
@@ -53,7 +50,7 @@ func Main() {
 	gc.Thearch.REGMAX = ppc64.REG_R31
 	gc.Thearch.FREGMIN = ppc64.REG_F0
 	gc.Thearch.FREGMAX = ppc64.REG_F31
-	gc.Thearch.MAXWIDTH = MAXWIDTH
+	gc.Thearch.MAXWIDTH = 1 << 50
 	gc.Thearch.ReservedRegs = resvd
 
 	gc.Thearch.Betypeinit = betypeinit

src/cmd/compile/internal/x86/galign.go

@@ -12,17 +12,9 @@ import (
 	"os"
 )
 
-var thechar int = '8'
-
-var thestring string = "386"
-
-var thelinkarch *obj.LinkArch = &x86.Link386
-
 func linkarchinit() {
 }
 
-var MAXWIDTH int64 = (1 << 32) - 1
-
 func betypeinit() {
 	gc.Widthptr = 4
 	gc.Widthint = 4
@@ -30,9 +22,9 @@ func betypeinit() {
 }
 
 func Main() {
-	gc.Thearch.Thechar = thechar
-	gc.Thearch.Thestring = thestring
-	gc.Thearch.Thelinkarch = thelinkarch
+	gc.Thearch.Thechar = '8'
+	gc.Thearch.Thestring = "386"
+	gc.Thearch.Thelinkarch = &x86.Link386
 	gc.Thearch.REGSP = x86.REGSP
 	gc.Thearch.REGCTXT = x86.REGCTXT
 	gc.Thearch.REGCALLX = x86.REG_BX
@@ -52,7 +44,7 @@ func Main() {
 		fmt.Fprintf(os.Stderr, "unsupported setting GO386=%s\n", v)
 		gc.Exit(1)
 	}
-	gc.Thearch.MAXWIDTH = MAXWIDTH
+	gc.Thearch.MAXWIDTH = (1 << 32) - 1
 	gc.Thearch.ReservedRegs = resvd
 
 	gc.Thearch.Betypeinit = betypeinit