add stub file iasmaarch64.d for AArch64 inline assembler

Author: WalterBright

compiler/src/build.d

@@ -1558,7 +1558,7 @@ auto sourceFiles()
     }
     DmdSources dmd = {
         glue: fileArray(env["D"], "
-            dmsc.d e2ir.d iasmdmd.d glue.d objc_glue.d
+            dmsc.d e2ir.d iasmdmd.d iasmaarch64.d glue.d objc_glue.d
             s2ir.d tocsym.d toctype.d tocvdebug.d todt.d toir.d toobj.d
         "),
         driver: fileArray(env["D"], "dinifile.d dmdparams.d gluelayer.d lib/package.d lib/elf.d lib/mach.d lib/mscoff.d

compiler/src/dmd/README.md

@@ -171,7 +171,8 @@ Note that these groups have no strict meaning, the category assignments are a bi
 | File                                                                    | Purpose                                   |
 |-------------------------------------------------------------------------|-------------------------------------------|
 | [iasm.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/iasm.d)       | Inline assembly depending on the compiler |
-| [iasmdmd.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/iasmdmd.d) | Inline assembly for DMD                   |
+| [iasmdmd.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/iasmdmd.d) | Inline assembly for DMD X86_64            |
+| [iasmaarch64.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/iasmaarch64.d) | Inline assembly for DMD AArch64   |
 | [iasmgcc.d](https://github.com/dlang/dmd/blob/master/compiler/src/dmd/iasmgcc.d) | Inline assembly for GDC                   |
 
 **Other**

compiler/src/dmd/iasm.d

@@ -20,6 +20,7 @@ import dmd.dsymbol;
 import dmd.expression;
 import dmd.func;
 import dmd.mtype;
+import dmd.target;
 import dmd.tokens;
 import dmd.statement;
 import dmd.statementsem;
@@ -34,6 +35,7 @@ else version (IN_GCC)
 else
 {
     import dmd.iasmdmd;
+    import dmd.iasmaarch64;
     version = MARS;
 }
 
@@ -73,7 +75,9 @@ Statement asmSemantic(AsmStatement s, Scope* sc)
         }
         auto ias = new InlineAsmStatement(s.loc, s.tokens);
         ias.caseSensitive = s.caseSensitive;
-        return inlineAsmSemantic(ias, sc);
+        return (target.isAArch64)
+            ? inlineAsmAArch64Semantic(ias, sc)
+            : inlineAsmSemantic(ias, sc);       // X86_64
     }
     else version (IN_GCC)
     {

compiler/src/dmd/iasmaarch64.d

@@ -0,0 +1,69 @@
+/**
+ * Inline assembler implementation for DMD.
+ * https://dlang.org/spec/iasm.html
+ *
+ * Copyright:   Copyright (C) 2025 by The D Language Foundation, All Rights Reserved
+ * Authors:     Walter Bright
+ * License:     $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
+ * Source:      $(LINK2 https://github.com/dlang/dmd/blob/master/compiler/src/dmd/iasmaarch64.d, _iasmaarch64.d)
+ * Documentation:  https://dlang.org/phobos/dmd_iasmaarch64.html
+ * Coverage:    https://codecov.io/gh/dlang/dmd/src/master/compiler/src/dmd/iasmaarch64.d
+ */
+
+module dmd.iasmaarch64;
+
+import core.stdc.stdio;
+import core.stdc.stdarg;
+import core.stdc.stdlib;
+import core.stdc.string;
+
+import dmd.astenums;
+import dmd.declaration;
+import dmd.denum;
+import dmd.dinterpret;
+import dmd.dmdparams;
+import dmd.dscope;
+import dmd.dsymbol;
+import dmd.errors;
+import dmd.expression;
+import dmd.expressionsem;
+import dmd.funcsem : checkNestedReference;
+import dmd.globals;
+import dmd.id;
+import dmd.identifier;
+import dmd.init;
+import dmd.location;
+import dmd.mtype;
+import dmd.optimize;
+import dmd.statement;
+import dmd.target;
+import dmd.tokens;
+import dmd.typesem : pointerTo, size;
+
+import dmd.root.ctfloat;
+import dmd.common.outbuffer;
+import dmd.root.rmem;
+import dmd.rootobject;
+
+import dmd.backend.cc;
+import dmd.backend.cdef;
+import dmd.backend.code;
+import dmd.backend.x86.code_x86;
+import dmd.backend.codebuilder : CodeBuilder;
+import dmd.backend.global;
+import dmd.backend.iasm;
+
+/************************
+ * Perform semantic analysis on InlineAsmStatement.
+ * Params:
+ *      s = inline asm statement
+ *      sc = context
+ * Returns:
+ *      `s` on success, ErrorStatement if errors happened
+ */
+public Statement inlineAsmAArch64Semantic(InlineAsmStatement s, Scope* sc)
+{
+    //printf("InlineAsmAArch64Statement.semantic()\n");
+    error(s.loc, "AArch64 inline assembler not implemented (yet!)");
+    return new ErrorStatement();
+}