builtin: llgo.advance

cl/compile.go

@@ -300,6 +300,15 @@ func cstr(b llssa.Builder, args []ssa.Value) (ret llssa.Expr) {
 	panic("cstr(<string-literal>): invalid arguments")
 }
 
+func (p *context) advance(b llssa.Builder, args []ssa.Value) (ret llssa.Expr) {
+	if len(args) == 2 {
+		ptr := p.compileValue(b, args[0])
+		offset := p.compileValue(b, args[1])
+		return b.Advance(ptr, offset)
+	}
+	panic("advance(p ptr, offset int): invalid arguments")
+}
+
 // func alloca(size uintptr) unsafe.Pointer
 func (p *context) alloca(b llssa.Builder, args []ssa.Value) (ret llssa.Expr) {
 	if len(args) == 1 {
@@ -355,6 +364,8 @@ func (p *context) compileInstrOrValue(b llssa.Builder, iv instrOrValue, asValue
 				ret = b.Call(fn.Expr, args...)
 			case llgoCstr:
 				ret = cstr(b, call.Args)
+			case llgoAdvance:
+				ret = p.advance(b, call.Args)
 			case llgoAlloca:
 				ret = p.alloca(b, call.Args)
 			case llgoAllocaCStr:

cl/import.go

@@ -200,6 +200,7 @@ const (
 	llgoCstr        = llgoInstrBase + 1
 	llgoAlloca      = llgoInstrBase + 2
 	llgoAllocaCStr  = llgoInstrBase + 3
+	llgoAdvance     = llgoInstrBase + 4
 )
 
 func (p *context) funcName(pkg *types.Package, fn *ssa.Function, ignore bool) (string, int) {
@@ -237,6 +238,8 @@ func (p *context) funcOf(fn *ssa.Function) (ret llssa.Function, ftype int) {
 		switch name {
 		case "cstr":
 			ftype = llgoCstr
+		case "advance":
+			ftype = llgoAdvance
 		case "alloca":
 			ftype = llgoAlloca
 		case "allocaCStr":