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loadertest: rel8/32 operands

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This commit is contained in:
Michael McLoughlin
2018-11-22 16:21:05 -06:00
parent 27235485a6
commit 4404836ff4
3 changed files with 42 additions and 11 deletions
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39
internal/gen/loadertest.go
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@@ -9,12 +9,21 @@ import (
"github.com/mmcloughlin/avo/internal/inst"
)
type LoaderTest struct{}
type LoaderTest struct {
sym string // reference to the test function symbol
rel8 string // label to be used for near jumps
rel32 string // label for far jumps
}
func (l LoaderTest) Generate(w io.Writer, is []*inst.Instruction) error {
func (l *LoaderTest) Generate(w io.Writer, is []*inst.Instruction) error {
p := &printer{w: w}
p.printf("TEXT loadertest(SB), 0, $0\n")
l.sym = "\u00b7loadertest(SB)"
p.printf("TEXT %s, 0, $0\n", l.sym)
// Define a label for far jumps.
p.printf("rel32:\n")
l.rel32 = "rel32"
counts := map[string]int{}
@@ -26,8 +35,14 @@ func (l LoaderTest) Generate(w io.Writer, is []*inst.Instruction) error {
continue
}
if i.Opcode[0] == 'J' {
label := fmt.Sprintf("rel8_%s", strings.ToLower(i.Opcode))
p.printf("%s:\n", label)
l.rel8 = label
}
for _, f := range i.Forms {
as := args(f.Operands)
as := l.args(i.Opcode, f.Operands)
p.printf("\t// %#v\n", f.Operands)
if as == nil {
p.printf("\t// TODO\n")
@@ -53,6 +68,7 @@ func (l LoaderTest) skip(opcode string) (bool, string) {
prefixes := map[string]string{
"PUSH": "PUSH can produce 'unbalanced PUSH/POP' assembler error",
"POP": "POP can produce 'unbalanced PUSH/POP' assembler error",
"CALL": "handled specially",
}
for p, m := range prefixes {
if strings.HasPrefix(opcode, p) {
@@ -62,10 +78,15 @@ func (l LoaderTest) skip(opcode string) (bool, string) {
return false, ""
}
func args(ops []inst.Operand) []string {
func (l LoaderTest) args(opcode string, ops []inst.Operand) []string {
// Special case for CALL, since it needs a different type of rel32 argument than others.
if opcode == "CALL" {
return []string{l.sym}
}
as := make([]string, len(ops))
for i, op := range ops {
a := arg(op.Type)
a := l.arg(op.Type)
if a == "" {
return nil
}
@@ -75,7 +96,7 @@ func args(ops []inst.Operand) []string {
}
// arg generates an argument for an operand of the given type.
func arg(t string) string {
func (l LoaderTest) arg(t string) string {
m := map[string]string{
"1": "$1", // <xs:enumeration value="1" />
"3": "$3", // <xs:enumeration value="3" />
@@ -145,8 +166,8 @@ func arg(t string) string {
// <xs:enumeration value="vm32z{k}" />
// <xs:enumeration value="vm64z" />
// <xs:enumeration value="vm64z{k}" />
// <xs:enumeration value="rel8" />
// <xs:enumeration value="rel32" />
"rel8": l.rel8, // <xs:enumeration value="rel8" />
"rel32": l.rel32, // <xs:enumeration value="rel32" />
// <xs:enumeration value="{er}" />
// <xs:enumeration value="{sae}" />