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compiler: implement builtin copy(dst, src []T)

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Not implemented: copying a string into a []byte slice.
This commit is contained in:
Ayke van Laethem
2018-09-06 10:37:44 +02:00
parent fd9fa038a9
commit 5aa8b71ae1
3 changed files with 55 additions and 1 deletions
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compiler.go
+22
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@@ -1523,6 +1523,28 @@ func (c *Compiler) parseBuiltin(frame *Frame, args []ssa.Value, callName string)
default:
return llvm.Value{}, errors.New("todo: cap: unknown type")
}
case "copy":
dst, err := c.parseExpr(frame, args[0])
if err != nil {
return llvm.Value{}, err
}
src, err := c.parseExpr(frame, args[1])
if err != nil {
return llvm.Value{}, err
}
if _, ok := args[1].Type().(*types.Basic); ok {
return llvm.Value{}, errors.New("todo: copy: string to []byte")
}
dstLen := c.builder.CreateExtractValue(dst, 1, "copy.dstLen")
srcLen := c.builder.CreateExtractValue(src, 1, "copy.srcLen")
dstBuf := c.builder.CreateExtractValue(dst, 0, "copy.dstArray")
srcBuf := c.builder.CreateExtractValue(src, 0, "copy.srcArray")
elemType := dstBuf.Type().ElementType()
dstBuf = c.builder.CreateBitCast(dstBuf, c.i8ptrType, "copy.dstPtr")
srcBuf = c.builder.CreateBitCast(srcBuf, c.i8ptrType, "copy.srcPtr")
elemSize := llvm.ConstInt(c.uintptrType, c.targetData.TypeAllocSize(elemType), false)
sliceCopy := c.mod.NamedFunction("runtime.sliceCopy")
return c.builder.CreateCall(sliceCopy, []llvm.Value{dstBuf, srcBuf, dstLen, srcLen, elemSize}, "copy.n"), nil
case "len":
value, err := c.parseExpr(frame, args[0])
if err != nil {