feat(asm): add AArch64 arm64 encoder with ground-truth verification
Assisted-by: MiMo V2.5 Pro
This commit is contained in:
@@ -0,0 +1,380 @@
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// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: BSD-3-Clause
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package asm
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import (
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"testing"
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"sourcedock.dev/petrbalvin/gasm-devkit/ast"
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"sourcedock.dev/petrbalvin/gasm-devkit/parser"
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)
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func TestArm64LDRSTREncoding(t *testing.T) {
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tests := []struct {
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name string
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got uint32
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want uint32
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}{
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{"LDR X4, [SP, #56]", a64LSU(3, 0, 1, 7, 31, 4), 0xf9401fe4},
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{"STR X4, [SP, #64]", a64LSU(3, 0, 0, 8, 31, 4), 0xf90023e4},
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{"STR X5, [SP, #32]", a64LSU(3, 0, 0, 4, 31, 5), 0xf90013e5},
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{"LDR X6, [SP, #32]", a64LSU(3, 0, 1, 4, 31, 6), 0xf94013e6},
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}
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for _, tt := range tests {
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if tt.got != tt.want {
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t.Errorf("%s: got %08x, want %08x", tt.name, tt.got, tt.want)
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}
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}
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}
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func TestArm64PrologueEncoding(t *testing.T) {
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fi := arm64FrameInfo{autosize: 48, frame: 32, leaf: false}
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pro := arm64Prologue(fi)
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if len(pro) != 12 {
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t.Fatalf("prologue length: got %d, want 12", len(pro))
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}
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expected := []uint32{0xf81d0ffe, 0xf81f83fd, 0xd10023fd}
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for i, w := range leWords(pro) {
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if w != expected[i] {
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t.Errorf("prologue word %d: got %08x, want %08x", i, w, expected[i])
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}
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}
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}
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func TestArm64EpilogueSmallEncoding(t *testing.T) {
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fi := arm64FrameInfo{autosize: 48, frame: 32, leaf: false}
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ret := arm64Return(fi)
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if len(ret) != 12 {
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t.Fatalf("epilogue length: got %d, want 12", len(ret))
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}
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expected := []uint32{0x9100a3fd, 0x9100c3ff, 0xd65f03c0}
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for i, w := range leWords(ret) {
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if w != expected[i] {
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t.Errorf("epilogue word %d: got %08x, want %08x", i, w, expected[i])
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}
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}
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}
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func TestArm64LargeFrameEncoding(t *testing.T) {
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fi := arm64FrameInfo{autosize: 272, frame: 256, leaf: false}
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pro := arm64Prologue(fi)
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if len(pro) != 16 {
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t.Fatalf("prologue length: got %d, want 16", len(pro))
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}
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expected := []uint32{0xd10443f4, 0xa93ffa9d, 0x9100029f, 0xd10023fd}
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for i, w := range leWords(pro) {
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if w != expected[i] {
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t.Errorf("prologue word %d: got %08x, want %08x", i, w, expected[i])
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}
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}
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epi := arm64Return(fi)
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if len(epi) != 12 {
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t.Fatalf("epilogue length: got %d, want 12", len(epi))
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}
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eexpected := []uint32{0xa97ffbfd, 0x910443ff, 0xd65f03c0}
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for i, w := range leWords(epi) {
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if w != eexpected[i] {
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t.Errorf("epilogue word %d: got %08x, want %08x", i, w, eexpected[i])
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}
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}
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}
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func TestArm64NoFrame(t *testing.T) {
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fi := arm64FrameInfo{autosize: 0, frame: 0, leaf: true}
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pro := arm64Prologue(fi)
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if len(pro) != 0 {
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t.Errorf("no-frame prologue: got %d bytes, want 0", len(pro))
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}
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ret := arm64Return(fi)
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if len(ret) != 4 {
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t.Fatalf("no-frame return: got %d bytes, want 4", len(ret))
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}
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if leWord(ret) != 0xd65f03c0 {
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t.Errorf("no-frame RET: got %08x, want d65f03c0", leWord(ret))
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}
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}
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func TestArm64RegNum(t *testing.T) {
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tests := []struct {
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name string
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want int
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}{
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{"R0", 0}, {"R4", 4}, {"R29", 29}, {"R30", 30}, {"R31", 31},
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{"FP", 29}, {"LR", 30}, {"LINK", 30}, {"SP", 31}, {"ZR", 31},
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{"F0", 0}, {"F4", 4}, {"F31", 31},
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{"INVALID", -1}, {"X0", -1}, {"", -1},
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}
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for _, tt := range tests {
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got := arm64RegNum(tt.name)
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if got != tt.want {
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t.Errorf("arm64RegNum(%q) = %d, want %d", tt.name, got, tt.want)
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}
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}
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}
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func TestArm64ComputeFrame(t *testing.T) {
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src := "TEXT ·f(SB), NOSPLIT, $32-0\n\tADD\tR4, R5\n\tRET\n"
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f, errs := parser.Parse("test_arm64.s", src)
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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fi := arm64ComputeFrame(f.Decls[0].(*ast.Text))
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if fi.frame != 32 {
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t.Errorf("frame: got %d, want 32", fi.frame)
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}
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if fi.autosize != 48 { // 32+8=40, aligned to48
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t.Errorf("autosize: got %d, want 48", fi.autosize)
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}
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// ADD + RET with no CALL/BL → leaf
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if !fi.leaf {
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t.Error("expected leaf")
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}
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}
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func TestArm64IsLeaf(t *testing.T) {
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src := "TEXT ·f(SB), NOSPLIT, $0-0\n\tADD\tR4, R5\n\tRET\n"
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f, errs := parser.Parse("test_arm64.s", src)
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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if !arm64IsLeaf(f.Decls[0].(*ast.Text)) {
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t.Error("expected leaf")
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}
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src2 := "TEXT ·f(SB), NOSPLIT, $0-0\n\tBL\tother(SB)\n\tRET\n"
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f2, errs := parser.Parse("test_arm64.s", src2)
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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if arm64IsLeaf(f2.Decls[0].(*ast.Text)) {
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t.Error("expected non-leaf")
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}
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}
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func TestArm64Bitmask(t *testing.T) {
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tests := []struct {
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v uint64
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sf int
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N, immr, imms uint32
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ok bool
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}{
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{1, 1, 1, 0, 0, true}, // single bit at pos 0
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{2, 1, 1, 1, 0, true}, // single bit at pos 1 (rotated right by1)
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{0, 1, 0, 0, 0, false}, // zero is not a bitmask
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{0xFFFFFFFFFFFFFFFF, 1, 0, 0, 0, false}, // all ones is not a bitmask
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{0x5555555555555555, 1, 0, 0, 0x3E, true}, // alternating bits (esize=2, ones=1)
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{0xFFFFFFFF00000000, 1, 1, 32, 31, true}, // upper 32 bits set (esize=64, ones=32)
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}
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for _, tt := range tests {
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N, immr, imms, ok := arm64Bitmask(tt.v, tt.sf)
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if ok != tt.ok {
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t.Errorf("arm64Bitmask(%#x, %d): ok=%v, want %v", tt.v, tt.sf, ok, tt.ok)
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continue
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}
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if ok && (N != tt.N || immr != tt.immr || imms != tt.imms) {
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t.Errorf("arm64Bitmask(%#x, %d): N=%d immr=%d imms=%d, want N=%d immr=%d imms=%d",
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tt.v, tt.sf, N, immr, imms, tt.N, tt.immr, tt.imms)
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}
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}
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}
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func TestArm64AssembleFile(t *testing.T) {
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src := `#include "textflag.h"
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TEXT ·simple(SB), NOSPLIT, $0-0
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MOV R4, R5
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ADD R4, R5, R6
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RET
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`
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f, errs := parser.Parse("test_arm64.s", src)
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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img, err := AssembleFileARM64(f)
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if err != nil {
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t.Fatalf("AssembleFileARM64: %v", err)
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}
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if len(img.Funcs) != 1 {
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t.Fatalf("got %d funcs, want 1", len(img.Funcs))
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}
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fn := img.Funcs[0]
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if fn.Name != "simple" {
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t.Errorf("func name: got %q, want %q", fn.Name, "simple")
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}
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//3 instructions ×4 bytes =12
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if fn.Size != 12 {
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t.Errorf("func size: got %d, want 12", fn.Size)
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}
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}
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func TestArm64AssembleFileWithFrame(t *testing.T) {
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src := `#include "textflag.h"
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TEXT ·framed(SB), NOSPLIT, $16-8
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MOVD arg+0(FP), R4
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ADD $1, R4, R4
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MOVD R4, ret+0(FP)
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RET
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`
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f, errs := parser.Parse("test_arm64.s", src)
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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img, err := AssembleFileARM64(f)
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if err != nil {
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t.Fatalf("AssembleFileARM64: %v", err)
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}
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if len(img.Funcs) != 1 {
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t.Fatalf("got %d funcs, want 1", len(img.Funcs))
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}
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fn := img.Funcs[0]
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if fn.Frame != 16 {
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t.Errorf("frame: got %d, want 16", fn.Frame)
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}
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// Prologue (3×4=12) + body (3×4=12) + RET epilogue (3×4=12) = 36
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if fn.Size != 36 {
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t.Errorf("func size: got %d, want 36", fn.Size)
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}
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}
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func TestArm64AssembleFileWithBranches(t *testing.T) {
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src := `#include "textflag.h"
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TEXT ·branch(SB), NOSPLIT, $0-0
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BEQ done
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BNE skip
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skip:
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ADD R4, R5
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done:
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RET
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`
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f, errs := parser.Parse("test_arm64.s", src)
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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img, err := AssembleFileARM64(f)
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if err != nil {
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t.Fatalf("AssembleFileARM64: %v", err)
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}
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fn := img.Funcs[0]
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if fn.Size != 16 {
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t.Errorf("func size: got %d, want 16", fn.Size)
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}
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}
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func TestArm64AssembleFileWithJumpChain(t *testing.T) {
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src := `#include "textflag.h"
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TEXT ·chain(SB), NOSPLIT, $0-0
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BNE skip
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ADD R4, R5
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RET
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skip:
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B target
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target:
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ADD R6, R7
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RET
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`
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f, errs := parser.Parse("test_arm64.s", src)
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if len(errs) > 0 {
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t.Fatalf("parse: %v", errs)
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}
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img, err := AssembleFileARM64(f)
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if err != nil {
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t.Fatalf("AssembleFileARM64: %v", err)
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}
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// BNE should be redirected past skip→target to target directly.
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if img.Funcs[0].Size != 24 {
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t.Errorf("func size: got %d, want 24", img.Funcs[0].Size)
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}
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}
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func TestArm64AssembleErrors(t *testing.T) {
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tests := []struct {
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name string
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src string
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}{
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{"unsupported", "TEXT ·f(SB), NOSPLIT, $0-0\n\tINVALID\tR4, R5\n\tRET\n"},
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{"undefined label", "TEXT ·f(SB), NOSPLIT, $0-0\n\tB\tnosuch\n\tRET\n"},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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f, errs := parser.Parse("test_arm64.s", tt.src)
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if len(errs) > 0 {
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return // parse error, that's fine
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}
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_, err := AssembleFileARM64(f)
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if err == nil {
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t.Error("expected error, got nil")
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}
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})
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}
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}
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func TestArm64Movcon(t *testing.T) {
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tests := []struct {
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v int64
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want int
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}{
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{0, 0}, // 0 fits at shift 0
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{1, 0}, // single bit at shift 0
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{0x10000, 16}, // single bit at shift 16
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{0x100000000, 32}, // single bit at shift 32
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{0xFF, 0}, // 0xFF fits at shift 0
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{0x12345, -1}, // multiple chunks, not movcon
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}
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for _, tt := range tests {
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got := arm64Movcon(tt.v)
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if got != tt.want {
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t.Errorf("arm64Movcon(%#x) = %d, want %d", tt.v, got, tt.want)
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}
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}
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}
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func TestArm64RegClassOf(t *testing.T) {
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if arm64RegClassOf("R4") != arm64ClsGR {
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t.Error("R4 should be GR")
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}
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if arm64RegClassOf("F4") != arm64ClsFP {
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t.Error("F4 should be FP")
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}
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if arm64RegClassOf("") != arm64ClsNone {
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t.Error("empty should be None")
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}
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}
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func TestArm64ResolvePseudo(t *testing.T) {
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fi := arm64FrameInfo{autosize: 48, frame: 32}
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// FP: offset = sym.Offset + autosize +8
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base, off := arm64ResolvePseudo(&ast.Symbol{Pseudo: "FP", Offset: 0}, fi)
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if base != 31 || off != 56 {
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t.Errorf("FP: base=%d off=%d, want 31, 56", base, off)
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}
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// SP: offset = sym.Offset + frame +8
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base, off = arm64ResolvePseudo(&ast.Symbol{Pseudo: "SP", Offset: -8}, fi)
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if base != 31 || off != 32 {
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t.Errorf("SP: base=%d off=%d, want 31, 32", base, off)
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}
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// SB: unresolved
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base, _ = arm64ResolvePseudo(&ast.Symbol{Pseudo: "SB"}, fi)
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if base != -1 {
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t.Errorf("SB: base=%d, want -1", base)
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}
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}
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// leWord reads a little-endian uint32 from b.
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func leWord(b []byte) uint32 {
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return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
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}
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// leWords reads all little-endian uint32s from b.
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func leWords(b []byte) []uint32 {
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n := len(b) / 4
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w := make([]uint32, n)
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for i := range w {
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w[i] = leWord(b[i*4:])
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}
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return w
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}
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