feat: gasm-devkit 0.1.0 — GAsm lexer, parser, linter, formatter, LSP and amd64 assembler

Assisted-by: Qwen 3.8 Max Preview

asm/operand.go

@@ -0,0 +1,43 @@
+// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
+// SPDX-License-Identifier: BSD-3-Clause
+
+package asm
+
+// Operand is an instruction operand: a Reg, a Mem reference or an Imm value.
+type Operand interface {
+	isOperand()
+}
+
+// Imm is an immediate value.  Its encoded width is chosen by the instruction
+// (sign-extended imm8 where possible, otherwise imm32, imm64 for MOV).
+type Imm int64
+
+func (Imm) isOperand() {}
+
+// Mem is a memory operand of the form disp(base)(index*scale).
+type Mem struct {
+	Base     Reg
+	Index    Reg
+	Scale    int // 1, 2, 4 or 8; 0 means no index
+	Disp     int64
+	Size     int // operand width in bytes
+	HasBase  bool
+	HasIndex bool
+}
+
+func (Mem) isOperand() {}
+
+// Ptr builds a plain displaced memory operand (base)+disp of the given size.
+func Ptr(base Reg, disp int64, size int) Mem {
+	return Mem{Base: base, Disp: disp, Size: size, HasBase: true}
+}
+
+// Idx builds an indexed memory operand disp(base)(index*scale).
+func Idx(base, index Reg, scale int, disp int64, size int) Mem {
+	return Mem{Base: base, Index: index, Scale: scale, Disp: disp, Size: size, HasBase: true, HasIndex: true}
+}
+
+// Rip builds a RIP-relative memory operand (RIP)+disp.
+func Rip(disp int64, size int) Mem {
+	return Mem{Disp: disp, Size: size}
+}