Added asmc package

src/asmc/jump.go

@@ -0,0 +1,47 @@
+package asmc
+
+import (
+	"git.akyoto.dev/cli/q/src/asm"
+	"git.akyoto.dev/cli/q/src/x86"
+)
+
+func (c *compiler) jump(x asm.Instruction) {
+	switch x.Mnemonic {
+	case asm.JE:
+		c.code = x86.Jump8IfEqual(c.code, 0x00)
+	case asm.JNE:
+		c.code = x86.Jump8IfNotEqual(c.code, 0x00)
+	case asm.JG:
+		c.code = x86.Jump8IfGreater(c.code, 0x00)
+	case asm.JGE:
+		c.code = x86.Jump8IfGreaterOrEqual(c.code, 0x00)
+	case asm.JL:
+		c.code = x86.Jump8IfLess(c.code, 0x00)
+	case asm.JLE:
+		c.code = x86.Jump8IfLessOrEqual(c.code, 0x00)
+	case asm.JUMP:
+		c.code = x86.Jump8(c.code, 0x00)
+	}
+
+	size := 1
+	label := x.Data.(*asm.Label)
+
+	pointer := &pointer{
+		Position: Address(len(c.code) - size),
+		OpSize:   1,
+		Size:     uint8(size),
+	}
+
+	pointer.Resolve = func() Address {
+		destination, exists := c.codeLabels[label.Name]
+
+		if !exists {
+			panic("unknown jump label")
+		}
+
+		distance := destination - (pointer.Position + Address(pointer.Size))
+		return Address(distance)
+	}
+
+	c.codePointers = append(c.codePointers, pointer)
+}