130 lines
3.2 KiB
Go
130 lines
3.2 KiB
Go
package vm
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import (
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"strconv"
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"github.com/mediocregopher/ginger/lang"
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"llvm.org/llvm/bindings/go/llvm"
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)
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type buildCmd struct {
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pattern lang.Tuple
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inTypeFn func(lang.Term) (llvm.Type, error)
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outTypeFn func(lang.Term) (llvm.Type, error)
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buildFn func(lang.Term) (llvm.Value, error)
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}
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func (cmd buildCmd) matches(t lang.Term) bool {
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return lang.Match(cmd.pattern, t)
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}
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func (cmd buildCmd) inType(t lang.Term) (llvm.Type, error) {
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if cmd.inTypeFn == nil {
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return llvm.VoidType(), nil
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}
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return cmd.inTypeFn(t)
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}
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func (cmd buildCmd) outType(t lang.Term) (llvm.Type, error) {
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if cmd.outTypeFn == nil {
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return llvm.VoidType(), nil
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}
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return cmd.outTypeFn(t)
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}
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func (cmd buildCmd) build(t lang.Term) (llvm.Value, error) {
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return cmd.buildFn(t)
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}
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func buildCmds(mod *Module) []buildCmd {
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aPat := func(a lang.Atom) lang.Tuple {
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return lang.Tuple{lang.AAtom, a}
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}
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cPat := func(t lang.Term) lang.Tuple {
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return lang.Tuple{lang.AConst, t}
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}
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tPat := func(el ...lang.Term) lang.Tuple {
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return lang.Tuple{lang.ATuple, lang.Tuple(el)}
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}
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buildPat := func(a lang.Atom, b lang.Tuple) lang.Tuple {
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return tPat(aPat(a), b)
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}
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return []buildCmd{
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{ // (int 42)
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pattern: buildPat(lang.AInt, cPat(lang.AUnder)),
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outTypeFn: func(t lang.Term) (llvm.Type, error) {
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return llvm.Int64Type(), nil
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},
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buildFn: func(t lang.Term) (llvm.Value, error) {
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con := t.(lang.Const)
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coni, err := strconv.ParseInt(string(con), 10, 64)
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if err != nil {
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return llvm.Value{}, err
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}
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// TODO why does this have to be cast?
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return llvm.ConstInt(llvm.Int64Type(), uint64(coni), false), nil
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},
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},
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{ // (tup ((atom foo) (const 10)))
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pattern: buildPat(lang.ATuple, lang.Tuple{lang.ATuple, lang.AUnder}),
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outTypeFn: func(t lang.Term) (llvm.Type, error) {
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tup := t.(lang.Tuple)
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if len(tup) == 0 {
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return llvm.VoidType(), nil
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}
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var err error
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typs := make([]llvm.Type, len(tup))
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for i := range tup {
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if typs[i], err = mod.outType(tup[i]); err != nil {
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return llvm.Type{}, err
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}
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}
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return llvm.StructType(typs, false), nil
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},
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buildFn: func(t lang.Term) (llvm.Value, error) {
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tup := t.(lang.Tuple)
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// if the tuple is empty then it is a void
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if len(tup) == 0 {
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return llvm.Undef(llvm.VoidType()), nil
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}
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var err error
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vals := make([]llvm.Value, len(tup))
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typs := make([]llvm.Type, len(tup))
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for i := range tup {
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if vals[i], err = mod.build(tup[i]); err != nil {
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return llvm.Value{}, err
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}
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typs[i] = vals[i].Type()
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}
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str := llvm.Undef(llvm.StructType(typs, false))
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for i := range vals {
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str = mod.b.CreateInsertValue(str, vals[i], i, "")
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}
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return str, nil
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},
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},
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{ // (add ((const 5) (var foo)))
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pattern: buildPat(lang.AAdd, tPat(lang.TDblUnder, lang.TDblUnder)),
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outTypeFn: func(t lang.Term) (llvm.Type, error) {
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return llvm.Int64Type(), nil
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},
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buildFn: func(t lang.Term) (llvm.Value, error) {
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tup := t.(lang.Tuple)
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v1, err := mod.build(tup[0])
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if err != nil {
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return llvm.Value{}, err
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}
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v2, err := mod.build(tup[1])
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if err != nil {
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return llvm.Value{}, err
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}
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return mod.b.CreateAdd(v1, v2, ""), nil
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},
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},
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}
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}
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