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compiler: support for loops with no init/post condition

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Make it possible to use `for` loop with a single condition.
This commit is contained in:
Evgenii Stratonikov 2020-01-23 11:48:41 +03:00
parent 01e16e68ad
commit 328267ca6f
2 changed files with 33 additions and 2 deletions
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8
pkg/compiler/codegen.go
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@ -585,7 +585,9 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
)
// Walk the initializer and condition.
ast.Walk(c, n.Init)
if n.Init != nil {
ast.Walk(c, n.Init)
}
// Set label and walk the condition.
c.setLabel(fstart)
@ -596,7 +598,9 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
// Walk body followed by the iterator (post stmt).
ast.Walk(c, n.Body)
ast.Walk(c, n.Post)
if n.Post != nil {
ast.Walk(c, n.Post)
}
// Jump back to condition.
emitJmp(c.prog.BinWriter, opcode.JMP, int16(fstart))