examples/geohash: first version

Adds helper for constants as DATA sections.

build/global.go

@@ -58,3 +58,5 @@ func Load(src gotypes.Component, dst reg.Register) reg.Register { return ctx.Loa
 func Store(src reg.Register, dst gotypes.Component)             { ctx.Store(src, dst) }
 
 func AllocLocal(size int) operand.Mem { return ctx.AllocLocal(size) }
+
+func ConstData(name string, v operand.Constant) operand.Mem { return ctx.ConstData(name, v) }

build/pseudo.go

@@ -1,6 +1,7 @@
 package build
 
 import (
+	"github.com/mmcloughlin/avo/operand"
 	"github.com/mmcloughlin/avo/reg"
 
 	"github.com/mmcloughlin/avo/gotypes"
@@ -42,3 +43,9 @@ func (c *Context) Store(src reg.Register, dst gotypes.Component) {
 	}
 	c.mov(src, b.Addr, int(src.Bytes()), int(gotypes.Sizes.Sizeof(b.Type)), b.Type)
 }
+
+func (c *Context) ConstData(name string, v operand.Constant) operand.Mem {
+	g := c.StaticGlobal(name)
+	c.AppendDatum(v)
+	return g
+}