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compiler: add support for the append builtin

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This commit is contained in:
Ayke van Laethem
2018-10-19 14:40:19 +02:00
parent b81aecf753
commit 963ba16d7b
5 changed files with 112 additions and 11 deletions
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compiler/compiler.go
+28
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@@ -1654,6 +1654,34 @@ func (c *Compiler) parseInstr(frame *Frame, instr ssa.Instruction) error {
func (c *Compiler) parseBuiltin(frame *Frame, args []ssa.Value, callName string) (llvm.Value, error) {
switch callName {
case "append":
src, err := c.parseExpr(frame, args[0])
if err != nil {
return llvm.Value{}, err
}
elems, err := c.parseExpr(frame, args[1])
if err != nil {
return llvm.Value{}, err
}
srcBuf := c.builder.CreateExtractValue(src, 0, "append.srcBuf")
srcPtr := c.builder.CreateBitCast(srcBuf, c.i8ptrType, "append.srcPtr")
srcLen := c.builder.CreateExtractValue(src, 1, "append.srcLen")
srcCap := c.builder.CreateExtractValue(src, 2, "append.srcCap")
elemsBuf := c.builder.CreateExtractValue(elems, 0, "append.elemsBuf")
elemsPtr := c.builder.CreateBitCast(elemsBuf, c.i8ptrType, "append.srcPtr")
elemsLen := c.builder.CreateExtractValue(elems, 1, "append.elemsLen")
elemType := srcBuf.Type().ElementType()
elemSize := llvm.ConstInt(c.uintptrType, c.targetData.TypeAllocSize(elemType), false)
result := c.createRuntimeCall("sliceAppend", []llvm.Value{srcPtr, elemsPtr, srcLen, srcCap, elemsLen, elemSize}, "append.new")
newPtr := c.builder.CreateExtractValue(result, 0, "append.newPtr")
newBuf := c.builder.CreateBitCast(newPtr, srcBuf.Type(), "append.newBuf")
newLen := c.builder.CreateExtractValue(result, 1, "append.newLen")
newCap := c.builder.CreateExtractValue(result, 2, "append.newCap")
newSlice := llvm.Undef(src.Type())
newSlice = c.builder.CreateInsertValue(newSlice, newBuf, 0, "")
newSlice = c.builder.CreateInsertValue(newSlice, newLen, 1, "")
newSlice = c.builder.CreateInsertValue(newSlice, newCap, 2, "")
return newSlice, nil
case "cap":
value, err := c.parseExpr(frame, args[0])
if err != nil {