ast: fix #5376

mesonbuild/ast/interpreter.py

@@ -260,6 +260,12 @@ class AstInterpreter(interpreterbase.InterpreterBase):
             id_loop_detect = []
         flattend_args = []
 
+        if isinstance(args, BaseNode):
+            assert(hasattr(args, 'ast_id'))
+            if args.ast_id in id_loop_detect:
+                return [] # Loop detected
+            id_loop_detect += [args.ast_id]
+
         if isinstance(args, ArrayNode):
             args = [x for x in args.args.arguments]
 
@@ -301,8 +307,8 @@ class AstInterpreter(interpreterbase.InterpreterBase):
 
         # Resolve the contents of args
         for i in args:
-            if isinstance(i, IdNode) and i.value not in id_loop_detect:
-                flattend_args += self.flatten_args(quick_resolve(i), include_unknown_args, id_loop_detect + [i.value])
+            if isinstance(i, IdNode):
+                flattend_args += self.flatten_args(quick_resolve(i), include_unknown_args, id_loop_detect)
             elif isinstance(i, (ArrayNode, ArgumentNode, ArithmeticNode, MethodNode)):
                 flattend_args += self.flatten_args(i, include_unknown_args, id_loop_detect)
             elif isinstance(i, mparser.ElementaryNode):

mesonbuild/ast/introspection.py

@@ -118,7 +118,7 @@ class IntrospectionInterpreter(AstInterpreter):
         subproject_dir_abs = os.path.join(self.environment.get_source_dir(), self.subproject_dir)
         subpr = os.path.join(subproject_dir_abs, dirname)
         try:
-            subi = IntrospectionInterpreter(subpr, '', self.backend, cross_file=self.cross_file, subproject=dirname, subproject_dir=self.subproject_dir, env=self.environment)
+            subi = IntrospectionInterpreter(subpr, '', self.backend, cross_file=self.cross_file, subproject=dirname, subproject_dir=self.subproject_dir, env=self.environment, visitors=self.visitors)
             subi.analyze()
             subi.project_data['name'] = dirname
             self.project_data['subprojects'] += [subi.project_data]

mesonbuild/mconf.py

@@ -14,6 +14,7 @@
 
 import os
 from . import coredata, environment, mesonlib, build, mintro, mlog
+from .ast import AstIDGenerator
 
 def add_arguments(parser):
     coredata.register_builtin_arguments(parser)
@@ -52,7 +53,7 @@ class Conf:
             # Make sure that log entries in other parts of meson don't interfere with the JSON output
             mlog.disable()
             self.source_dir = os.path.abspath(os.path.realpath(self.build_dir))
-            intr = mintro.IntrospectionInterpreter(self.source_dir, '', 'ninja')
+            intr = mintro.IntrospectionInterpreter(self.source_dir, '', 'ninja', visitors = [AstIDGenerator()])
             intr.analyze()
             # Reenable logging just in case
             mlog.enable()

test cases/unit/55 introspection/meson.build

@@ -34,6 +34,13 @@ systype = '@0@, @1@, @2@'.format(systype, host_machine.cpu_family(), host_machin
 message(systype)
 ### END: Test inspired by taisei
 
+# Minimal code version to produce bug #5376
+# Code inspired by https://github.com/mesa3d/mesa/blob/974c4d679c23373dbed386c696e3e3bc1bfa23ae/meson.build#L1341-L1347
+osmesa_lib_name = 'OSMesa'
+osmesa_bits = '8'
+osmesa_lib_name = osmesa_lib_name + osmesa_bits
+message(osmesa_lib_name) # Infinite recursion gets triggered here when the parameter osmesa_lib_name is resolved
+
 test('test case 1', t1)
 test('test case 2', t2)
 benchmark('benchmark 1', t3)