121 lines
2.6 KiB
Go
121 lines
2.6 KiB
Go
package gen
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import (
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"bytes"
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"fmt"
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"strings"
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"text/tabwriter"
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"github.com/mmcloughlin/avo/internal/inst"
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)
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type ctors struct {
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cfg Config
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printer
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}
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func NewCtors(cfg Config) Interface {
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return GoFmt(&ctors{cfg: cfg})
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}
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func (c *ctors) Generate(is []inst.Instruction) ([]byte, error) {
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c.Printf("// %s\n\n", c.cfg.GeneratedWarning())
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c.Printf("package x86\n\n")
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c.Printf("import (\n")
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c.Printf("\t\"%s\"\n", pkg)
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c.Printf("\t\"%s/operand\"\n", pkg)
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c.Printf(")\n\n")
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for _, i := range is {
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c.instruction(i)
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}
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return c.Result()
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}
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func (c *ctors) instruction(i inst.Instruction) {
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for _, line := range c.doc(i) {
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c.Printf("// %s\n", line)
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}
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s := params(i)
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c.Printf("func %s(%s) (*avo.Instruction, error) {\n", i.Opcode, s.ParameterList())
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c.checkargs(i, s)
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c.Printf("\treturn &%s, nil\n", construct(i, s))
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c.Printf("}\n\n")
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}
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// doc generates the lines of the function comment.
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func (c *ctors) doc(i inst.Instruction) []string {
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lines := []string{
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fmt.Sprintf("%s: %s.", i.Opcode, i.Summary),
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"",
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"Forms:",
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"",
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}
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// Write a table of instruction forms.
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buf := bytes.NewBuffer(nil)
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w := tabwriter.NewWriter(buf, 0, 0, 1, ' ', 0)
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for _, f := range i.Forms {
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row := i.Opcode + "\t" + strings.Join(f.Signature(), "\t") + "\n"
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fmt.Fprint(w, row)
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}
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w.Flush()
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tbl := strings.TrimSpace(buf.String())
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for _, line := range strings.Split(tbl, "\n") {
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lines = append(lines, "\t"+line)
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}
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return lines
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}
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func construct(i inst.Instruction, s signature) string {
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buf := bytes.NewBuffer(nil)
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fmt.Fprintf(buf, "avo.Instruction{\n")
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fmt.Fprintf(buf, "\tOpcode: %#v,\n", i.Opcode)
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fmt.Fprintf(buf, "\tOperands: %s,\n", s.ParameterSlice())
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if i.IsBranch() {
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fmt.Fprintf(buf, "\tIsBranch: true,\n")
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fmt.Fprintf(buf, "\tIsConditional: %#v,\n", i.IsConditionalBranch())
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}
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fmt.Fprintf(buf, "}")
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return buf.String()
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}
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func (c *ctors) checkargs(i inst.Instruction, s signature) {
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if i.IsNiladic() {
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return
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}
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c.Printf("switch {\n")
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for _, f := range i.Forms {
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var conds []string
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if i.IsVariadic() {
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checklen := fmt.Sprintf("%s == %d", s.Length(), len(f.Operands))
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conds = append(conds, checklen)
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}
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for j, op := range f.Operands {
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checktype := fmt.Sprintf("%s(%s)", checkername(op.Type), s.ParameterName(j))
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conds = append(conds, checktype)
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}
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c.Printf("case %s:\n", strings.Join(conds, " && "))
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}
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c.Printf("default:\n")
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c.Printf("return nil, ErrBadOperandTypes\n")
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c.Printf("}\n")
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}
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// checkername returns the name of the function that checks an operand of type t.
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func checkername(t string) string {
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return "operand.Is" + strings.Title(t)
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}
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