Improved Windows ABI support

src/x86/Push.go

@@ -1,6 +1,31 @@
 package x86
 
-import "git.akyoto.dev/cli/q/src/cpu"
+import (
+	"git.akyoto.dev/cli/q/src/cpu"
+	"git.akyoto.dev/cli/q/src/sizeof"
+)
+
+// PushNumber pushes a number onto the stack.
+func PushNumber(code []byte, number int) []byte {
+	length := sizeof.Signed(number)
+
+	if length >= 8 {
+		panic("x86 does not support pushing 64-bit numbers")
+	}
+
+	if length >= 2 {
+		return append(
+			code,
+			0x68,
+			byte(number),
+			byte(number>>8),
+			byte(number>>16),
+			byte(number>>24),
+		)
+	}
+
+	return append(code, 0x6A, byte(number))
+}
 
 // PushRegister pushes the value inside the register onto the stack.
 func PushRegister(code []byte, register cpu.Register) []byte {