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Merge pull request #654 from nspcc-dev/feat/subslice

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compiler: support sub-slicing
This commit is contained in:
Roman Khimov 2020-02-16 23:49:53 +03:00 • committed by GitHub
commit d16121c10a
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4 changed files with 100 additions and 0 deletions
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23
pkg/compiler/codegen.go
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@ -309,6 +309,29 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
}
return nil
case *ast.SliceExpr:
name := n.X.(*ast.Ident).Name
c.emitLoadLocal(name)
if n.Low != nil {
ast.Walk(c, n.Low)
} else {
emit.Opcode(c.prog.BinWriter, opcode.PUSH0)
}
if n.High != nil {
ast.Walk(c, n.High)
} else {
emit.Opcode(c.prog.BinWriter, opcode.OVER)
emit.Opcode(c.prog.BinWriter, opcode.ARRAYSIZE)
}
emit.Opcode(c.prog.BinWriter, opcode.OVER)
emit.Opcode(c.prog.BinWriter, opcode.SUB)
emit.Opcode(c.prog.BinWriter, opcode.SUBSTR)
return nil
case *ast.ReturnStmt:
l := c.newLabel()
c.setLabel(l)