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compiler: implement slicing slices

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This commit is contained in:
Ayke van Laethem
2018-09-13 20:49:35 +02:00
parent 5b3ef2c02f
commit ec50db729d
1 changed files with 24 additions and 1 deletions
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compiler.go
+24 -1
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@@ -2272,7 +2272,30 @@ func (c *Compiler) parseExpr(frame *Frame, expr ssa.Value) (llvm.Value, error) {
case *types.Slice:
// slice a slice
return llvm.Value{}, errors.New("todo: slice a slice: " + typ.String())
oldPtr := c.builder.CreateExtractValue(value, 0, "")
oldLen := c.builder.CreateExtractValue(value, 1, "")
oldCap := c.builder.CreateExtractValue(value, 2, "")
if high.IsNil() {
high = oldLen
}
if !frame.fn.nobounds {
sliceBoundsCheck := c.mod.NamedFunction("runtime.sliceBoundsCheck")
c.builder.CreateCall(sliceBoundsCheck, []llvm.Value{oldLen, low, high}, "")
}
newPtr := c.builder.CreateGEP(oldPtr, []llvm.Value{low}, "")
newLen := c.builder.CreateSub(high, low, "")
newCap := c.builder.CreateSub(oldCap, low, "")
slice := llvm.ConstStruct([]llvm.Value{
llvm.Undef(newPtr.Type()),
llvm.Undef(c.lenType),
llvm.Undef(c.lenType),
}, false)
slice = c.builder.CreateInsertValue(slice, newPtr, 0, "")
slice = c.builder.CreateInsertValue(slice, newLen, 1, "")
slice = c.builder.CreateInsertValue(slice, newCap, 2, "")
return slice, nil
case *types.Basic:
if typ.Kind() != types.String {