diff --git a/App/lib/Stub/StubGen/VpiReader.vp b/App/lib/Stub/StubGen/VpiReader.vp
index 2a31489..85a2d84 100644
--- a/App/lib/Stub/StubGen/VpiReader.vp
+++ b/App/lib/Stub/StubGen/VpiReader.vp
@@ -2309,12 +2309,12 @@ def _vpi_register_typedef_closure(pool: memhub.MemBuddy*, import_mods: str, temp
                                         if neg_r != 0: fv_r = -fv_r
                                         # 浮点宽度同样由声明注解裁决（与定义方同一套），
                                         # 否则 `define PI: float = ...` 的使用方会把 f32 当 double
-                                        GenApi.register_cdefine_double(pool, cdef_t.id, fv_r, GenApi.cdefine_decl_float_bits(pool, aa_r.annotation))
+                                        GenApi.register_cdefine_double(pool, cdef_t.id, fv_r, GenApi.cdefine_decl_float_bits(pool, aa_r.annotation), sha1_r)
                                     elif cn_v.const_kind == ast.CONST_INT:
                                         cdef_val: int64 = GenApi.extract_cdefine_int_value(vnode_r)
                                         # 位宽与定义方同一套裁决（注解 → 右侧强转 → 值的最小可存宽度），
                                         # 否则使用方拿 bits=0 只能兜底，跨模块位宽会与定义方不一致
-                                        GenApi.register_cdefine_constant(pool, cdef_t.id, cdef_val, GenApi.cdefine_decl_bits(pool, aa_r.annotation, vnode_r))
+                                        GenApi.register_cdefine_constant(pool, cdef_t.id, cdef_val, GenApi.cdefine_decl_bits(pool, aa_r.annotation, vnode_r), sha1_r)
                         # recurse into child imports (cycle guarded by the visited marks)
                         if sub_imports[0] != '\0': _vpi_register_typedef_closure(pool, sub_imports, temp_dir, depth + 1)
                         stdlib.free(sub_imports)
@@ -3241,6 +3241,11 @@ def _ParseVpiIntoModuleImpl(pool: memhub.MemBuddy*, mod: mlirlite.LLVMModule*, v
             if pre_skip_fn_declares == 0:
                 _inject_method_declare(pool, mod, m_fd1, cls_name_v1, trans, src_sha1, imported_modules, from_imports, i32_ty, i8_ptr_ty, funcs_ptr, max_funcs)
 
+    def_mod: str = src_sha1
+    if trans is not None and trans.ModuleSha1 is not None and string.strcmp(trans.ModuleSha1, src_sha1) == 0:
+        # This vpi is the current module's own: keep its defines reachable by bare name.
+        def_mod = None
+
     i: sizet
     for i in range(int(n)):
         child: ast.AST* = ch.get(i)
@@ -3308,11 +3313,11 @@ def _ParseVpiIntoModuleImpl(pool: memhub.MemBuddy*, mod: mlirlite.LLVMModule*, v
                             # Float DefineT (e.g. FRAGMENTATION_THRESHOLD: t.DefineT = 0.7): register via
                             # register_cdefine_double (integer extraction would fail fast).
                             # 注解声明 float 时带上 f32 种类（与定义方同一套裁决）。
-                            GenApi.register_cdefine_double(pool, cdef_tgt.id, cdef_float_val, GenApi.cdefine_decl_float_bits(pool, aa.annotation))
+                            GenApi.register_cdefine_double(pool, cdef_tgt.id, cdef_float_val, GenApi.cdefine_decl_float_bits(pool, aa.annotation), def_mod)
                         elif cdef_is_str == 0:
                             cdef_val: int64 = GenApi.extract_cdefine_int_value(vnode)
                             # 位宽与定义方同一套裁决（注解 → 右侧强转 → 值的最小可存宽度）
-                            GenApi.register_cdefine_constant(pool, cdef_tgt.id, cdef_val, GenApi.cdefine_decl_bits(pool, aa.annotation, vnode))
+                            GenApi.register_cdefine_constant(pool, cdef_tgt.id, cdef_val, GenApi.cdefine_decl_bits(pool, aa.annotation, vnode), def_mod)
             else:
                 _inject_global_variable_declare(pool, mod, aa, trans, stub_imported_modules, stub_from_imports, i32_ty, i8_ptr_ty, src_sha1)
             continue
diff --git a/App/lib/core/Gen/Expr/ExprGenAttr.vp b/App/lib/core/Gen/Expr/ExprGenAttr.vp
index 5e8f9a5..215900e 100644
--- a/App/lib/core/Gen/Expr/ExprGenAttr.vp
+++ b/App/lib/core/Gen/Expr/ExprGenAttr.vp
@@ -350,46 +350,50 @@ novirtual class ExprGenAttr(ExprGenBase.ExprGenBase):
                 # first check whether it is an ordinary variable (higher priority than module attr)
                 ma_is_var: mlirlite.Value* = self.Gen.VarGen.lookup_var(trans.SymTab, nm_ma.id)
                 if ma_is_var is None:
-                    # first check whether it is a DefineT compile-time constant (e.g. ast.CONST_INT /
-                    # win32base.INVALID_HANDLE_VALUE); such constants require a cross-module .vp/.vpi search
-                    cdef_ma_val: int64 = self.Gen.TypeGenCDef.lookup_cdefine_constant(at.attr)
-                    cd_local: int = self.Gen.TypeGenCDef.is_cdefine_found()
-                    if cd_local == 0:
-                        # determine the real module name: prefer resolving the alias from _from_imports,
-                        # whose entries look like "local_name:real_module" (e.g. win32base:win32.win32base)
-                        real_mod_name: str = nm_ma.id
-                        if trans._from_imports is not None:
-                            resolved_mod: str = self.Gen.ImportsGen.lookup_from_import(trans._from_imports, nm_ma.id, 0)
-                            if resolved_mod is not None:
-                                # copy the module name into a new buffer (truncate at space, null, or ':')
-                                rm_len: sizet = 0
-                                while resolved_mod[rm_len] != ' ' and resolved_mod[rm_len] != '\0' and resolved_mod[rm_len] != ':': rm_len += 1
-                                rm_buf: str = pool.alloc(rm_len + 1)
-                                if rm_buf is not None:
-                                    for rm_i in range(int(rm_len)): rm_buf[rm_i] = resolved_mod[rm_i]
-                                    rm_buf[rm_len] = '\0'
-                                    real_mod_name = rm_buf
-                        # even when _from_imports is None (e.g. a plain `import ast`), still attempt the
-                        # cross-module DefineT lookup, else ast.CONST_INT is misread as @CONST_INT (undefined).
-                        if real_mod_name is not None:
-                            ma_fi_len: sizet = string.strlen(at.attr) + string.strlen(real_mod_name) + 2
-                            ma_fi: str = pool.alloc(ma_fi_len)
-                            if ma_fi is not None:
-                                viperlib.snprintf(ma_fi, ma_fi_len, "%s:%s", at.attr, real_mod_name)
-                                cdef_ma_val = self.Gen.ExprGenCdef._lookup_cross_module_cdefine(pool, at.attr, ma_fi)
+                    # Resolve the receiver module BEFORE any lookup. A module-qualified access
+                    # must never fall back to the bare table: that is how `b.VALUE` used to
+                    # return `a.VALUE` when both modules define VALUE.
+                    real_mod_name: str = None
+                    if trans._from_imports is not None:
+                        resolved_mod: str = self.Gen.ImportsGen.lookup_from_import(trans._from_imports, nm_ma.id, 0)
+                        if resolved_mod is not None:
+                            rm_len: sizet = 0
+                            while resolved_mod[rm_len] != ' ' and resolved_mod[rm_len] != '\0' and resolved_mod[rm_len] != ':': rm_len += 1
+                            rm_buf: str = pool.alloc(rm_len + 1)
+                            if rm_buf is not None:
+                                for rm_i in range(int(rm_len)): rm_buf[rm_i] = resolved_mod[rm_i]
+                                rm_buf[rm_len] = '\0'
+                                real_mod_name = rm_buf
+                    if real_mod_name is None and trans._imported_modules is not None:
+                        if self.Gen.ImportsGen.is_module_imported(trans._imported_modules, nm_ma.id) != 0: real_mod_name = nm_ma.id
+                    if real_mod_name is None and self._lookup_module_sha1(nm_ma.id) is not None: real_mod_name = nm_ma.id
+
+                    cd_mod: str = None
+                    cdef_ma_val: int64 = 0
+                    if real_mod_name is not None:
+                        # Qualified access: look up only this module's define.
+                        ma_fi_len: sizet = string.strlen(at.attr) + string.strlen(real_mod_name) + 2
+                        ma_fi: str = pool.alloc(ma_fi_len)
+                        if ma_fi is not None:
+                            viperlib.snprintf(ma_fi, ma_fi_len, "%s:%s", at.attr, real_mod_name)
+                            cdef_ma_val = self.Gen.ExprGenCdef._lookup_cross_module_cdefine(pool, at.attr, ma_fi)
+                            if self.Gen.TypeGenCDef.is_cdefine_found() != 0:
+                                cd_mod = self.Gen.TypeGenCDef.get_last_cdefine_module()
+                    else:
+                        # Non-module receiver (class/enum qualified field): bare table only.
+                        cdef_ma_val = self.Gen.TypeGenCDef.lookup_cdefine_constant(at.attr)
                     if self.Gen.TypeGenCDef.is_cdefine_found() != 0:
                         # cross-module string DefineT (e.g. pyzlib.ZLIB_VERSION = "1.3.2")
-                        # → string global constant (test_pyzlib.vp: ver = pyzlib.ZLIB_VERSION)
                         if self.Gen.TypeGenCDef.is_cdefine_str() != 0:
-                            cdef_str_v: str = self.Gen.TypeGenCDef.lookup_cdefine_string(at.attr)
+                            cdef_str_v: str = self.Gen.TypeGenCDef.lookup_cdefine_string(at.attr, cd_mod)
                             if cdef_str_v is not None: return self.Gen.ExprGenConst.create_global_string(builder, pool, mod, cdef_str_v, trans)
                         # cross-module float DefineT (e.g. vipermath.U_M_PI) → float constant
-                        dchk_ma: double = self.Gen.TypeGenCDef.lookup_cdefine_double(at.attr)
+                        dchk_ma: double = self.Gen.TypeGenCDef.lookup_cdefine_double(at.attr, cd_mod)
                         # f32 声明的常量直接出 f32 常量（否则 f32 字面量会被提升成 double）
                         if self.Gen.TypeGenCDef.is_cdefine_double() != 0:
                             if self.Gen.TypeGenCDef.is_cdefine_float32() != 0: return mlirlite.ConstFloat(pool, mlirlite.Float(pool), dchk_ma)
                             return mlirlite.ConstFloat(pool, mlirlite.Double(pool), dchk_ma)
-                        return self.Gen.ExprGenCdef._const_int_for_cdefine(pool, at.attr, cdef_ma_val)
+                        return self.Gen.ExprGenCdef._const_int_for_cdefine(pool, at.attr, cdef_ma_val, cd_mod)
                     # check whether nm_ma.id.at.attr is an imported submodule (e.g. win32.win32file);
                     # for a submodule do not create a global, let the nested attribute path handle it
                     is_submod: int = 0
@@ -493,23 +497,25 @@ novirtual class ExprGenAttr(ExprGenBase.ExprGenBase):
                                                 case _:
                                                     pass
                                             return mlirlite.build_load(builder, load_ty_nested, gv_ref_nested)
-                                # global not found: try a DefineT constant lookup; for nested module attributes
-                                # like win32.win32base.INVALID_HANDLE_VALUE, resolve the DefineT from the .vpi
-                                cdef_val_nested: int64 = self.Gen.TypeGenCDef.lookup_cdefine_constant(at.attr)
-                                if self.Gen.TypeGenCDef.is_cdefine_found() == 0:
-                                    # build a temporary from_imports "attr:module" for the cross-module lookup
-                                    tmp_fi_len: sizet = string.strlen(at.attr) + string.strlen(qual_buf) + 2
-                                    tmp_fi: str = pool.alloc(tmp_fi_len)
-                                    if tmp_fi is not None:
-                                        viperlib.snprintf(tmp_fi, tmp_fi_len, "%s:%s", at.attr, qual_buf)
-                                        cdef_val_nested = self.Gen.ExprGenCdef._lookup_cross_module_cdefine(pool, at.attr, tmp_fi)
+                                # DefineT lookup for a nested module attribute: the qualified
+                                # module is known, so never consult the bare table here.
+                                cdef_val_nested: int64 = 0
+                                tmp_fi_len: sizet = string.strlen(at.attr) + string.strlen(qual_buf) + 2
+                                tmp_fi: str = pool.alloc(tmp_fi_len)
+                                if tmp_fi is not None:
+                                    viperlib.snprintf(tmp_fi, tmp_fi_len, "%s:%s", at.attr, qual_buf)
+                                    cdef_val_nested = self.Gen.ExprGenCdef._lookup_cross_module_cdefine(pool, at.attr, tmp_fi)
                                 if self.Gen.TypeGenCDef.is_cdefine_found() != 0:
+                                    nst_mod: str = self.Gen.TypeGenCDef.get_last_cdefine_module()
                                     # cross-module float DefineT → float constant (f32 声明直接出 f32)
-                                    dchk_nst: double = self.Gen.TypeGenCDef.lookup_cdefine_double(at.attr)
+                                    dchk_nst: double = self.Gen.TypeGenCDef.lookup_cdefine_double(at.attr, nst_mod)
                                     if self.Gen.TypeGenCDef.is_cdefine_double() != 0:
                                         if self.Gen.TypeGenCDef.is_cdefine_float32() != 0: return mlirlite.ConstFloat(pool, mlirlite.Float(pool), dchk_nst)
                                         return mlirlite.ConstFloat(pool, mlirlite.Double(pool), dchk_nst)
-                                    return self.Gen.ExprGenCdef._const_int_for_cdefine(pool, at.attr, cdef_val_nested)
+                                    if self.Gen.TypeGenCDef.is_cdefine_str() != 0:
+                                        nst_s: str = self.Gen.TypeGenCDef.lookup_cdefine_string(at.attr, nst_mod)
+                                        if nst_s is not None: return self.Gen.ExprGenConst.create_global_string(builder, pool, mod, nst_s, trans)
+                                    return self.Gen.ExprGenCdef._const_int_for_cdefine(pool, at.attr, cdef_val_nested, nst_mod)
                                 # DefineT not found: fail-fast and stop compiling (no more undefined global
                                 # references, which would make llc report "use of undefined value").
                                 if self.Gen.ExprGenCdef._is_cdefine_name_pattern(at.attr) != 0:
diff --git a/App/lib/core/Gen/Expr/ExprGenCdef.vp b/App/lib/core/Gen/Expr/ExprGenCdef.vp
index f8ab2d4..6cb5954 100644
--- a/App/lib/core/Gen/Expr/ExprGenCdef.vp
+++ b/App/lib/core/Gen/Expr/ExprGenCdef.vp
@@ -127,15 +127,13 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
         # clear the found flag at entry so every early return reports "not found",
         # avoiding a stale success flag left over from a previous recursive call.
         self.Gen.TypeGenCDef.set_cdefine_found(0)
+        self.Gen.TypeGenCDef.set_last_cdefine_module(None)
         if name is None: return -1
         if from_imports is None: from_imports = ""
 
-        # 1. resolve the module name for `name` from from_imports; try exact match first
-        # (allow_star_fallback=0) so a star import cannot mislead DefineT constants.
-        mod_name_raw: str = self.Gen.ImportsGen.lookup_from_import(from_imports, name, 0)
-        if mod_name_raw is None:
-            # exact match failed: try the star import fallback
-            mod_name_raw = self.Gen.ImportsGen.lookup_from_import(from_imports, name, 1)
+        # 1. resolve the module name for `name` from from_imports. The LAST matching entry
+        # wins (Python name binding), so `from a import X; from b import X` resolves to b.
+        mod_name_raw: str = self.Gen.ImportsGen.lookup_from_import_last(from_imports, name)
 
         # truncate module name at NUL: lookup_from_import returns a pointer into from_imports
         # (not NUL-terminated); match _lookup_sha1_from_modname_raw (space/colon/NUL delimited).
@@ -153,6 +151,10 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
 
         # cross-module DefineT cache (perm_pool, reused across files): key = "name@srcModule"
         # keeps modules isolated so same-name constants from different modules do not cross.
+        # Local table entries are keyed by the source module SHA1 (stronger than a name alias).
+        sha1_pre: str = None
+        if mod_name_raw is not None: sha1_pre = self.Gen.CallGenBase._lookup_sha1_from_modname_raw(pool, mod_name_raw)
+        mod_key: str = sha1_pre if sha1_pre is not None else base_mod
         xkey_buf: str = None
         if base_mod is not None:
             xk_len: sizet = string.strlen(name) + string.strlen(base_mod) + 2
@@ -161,55 +163,27 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
                 viperlib.snprintf(xkey_buf, xk_len, "%s@%s", name, base_mod)
                 xval: str = self.Gen.TypeGenCDef.lookup_xmod_cdefine(xkey_buf)
                 if self.Gen.TypeGenCDef.is_cdefine_found() != 0:
-                    if self.Gen.TypeGenCDef.is_cdefine_str() != 0: self.Gen.TypeGenCDef.register_cdefine_string(pool, name, xval)
+                    self.Gen.TypeGenCDef.set_last_cdefine_module(mod_key)
+                    if self.Gen.TypeGenCDef.is_cdefine_str() != 0: self.Gen.TypeGenCDef.register_cdefine_string(pool, name, xval, mod_key)
                     elif self.Gen.TypeGenCDef.is_cdefine_double() != 0:
                         xd_v: double = string.atof(xval)
                         # 缓存里带宽度种类（f32 声明 → 1），否则使用方会把 f32 常量当 double 物化
                         xd_f32: int = self.Gen.TypeGenCDef.is_cdefine_float32()
-                        self.Gen.TypeGenCDef.register_cdefine_double(pool, name, xd_v, xd_f32)
+                        self.Gen.TypeGenCDef.register_cdefine_double(pool, name, xd_v, xd_f32, mod_key)
                     else:
                         xv_i: int64 = string.atoll(xval)
-                        self.Gen.TypeGenCDef.register_cdefine_constant(pool, name, xv_i)
+                        self.Gen.TypeGenCDef.register_cdefine_constant(pool, name, xv_i, 0, mod_key)
                     return string.atoll(xval)
 
-        # 2. from_imports failed: fall back to the imported_modules walk (step 9.6);
-        # a star fallback may name a wrong module, so keep scanning imported_modules.
+        # 2. No module could be resolved from from_imports. Do not guess by scanning every
+        # imported module: with same-name defines in several modules that picks an arbitrary
+        # value. Callers must qualify (a.X / b.X) or use an explicit from-import.
         if mod_name_raw is None:
-            # from_imports matched nothing (exact and star both failed):
-            # go straight to the imported_modules walk (step 9.6).
-            if imported_modules is None: return -1
-            # skip reading the from_imports module; go directly to the step 9.6 walk.
-            # result_found=0 skips steps 3-9 and jumps to 9.6.
-            self.Gen.TypeGenCDef.set_cdefine_found(0)
-            # iterate imported_modules directly
-            im_len: sizet = string.strlen(imported_modules)
-            im_ci: sizet = 0
-            while im_ci < im_len:
-                while im_ci < im_len and imported_modules[im_ci] == ' ': im_ci += 1
-                if im_ci >= im_len: break
-                im_start: sizet = im_ci
-                while im_ci < im_len and imported_modules[im_ci] != ' ': im_ci += 1
-                im_end: sizet = im_ci
-                im_nlen: sizet = im_end - im_start
-                if im_nlen > 0 and im_nlen < 256:
-                    im_buf: str = pool.alloc(im_nlen + 1)
-                    if im_buf is not None:
-                        for mk in range(int(im_nlen)):
-                            im_buf[mk] = imported_modules[im_start + mk]
-                        im_buf[im_nlen] = '\0'
-                        sub_fi: str = pool.alloc(im_nlen + 3)
-                        if sub_fi is not None:
-                            sub_fi[0] = '*'
-                            sub_fi[1] = ':'
-                            for mk2 in range(int(im_nlen)):
-                                sub_fi[2 + mk2] = im_buf[mk2]
-                            sub_fi[2 + im_nlen] = '\0'
-                            sub_val: int64 = self._lookup_cross_module_cdefine(pool, name, sub_fi, None, depth + 1, node)
-                            if self.Gen.TypeGenCDef.is_cdefine_found() != 0: return sub_val
             return -1
 
         # truncate module name, strip leading dots, find SHA1 via exact+suffix (shared logic)
-        sha1: str = self.Gen.CallGenBase._lookup_sha1_from_modname_raw(pool, mod_name_raw)
+        sha1: str = sha1_pre
+        if sha1 is None: sha1 = self.Gen.CallGenBase._lookup_sha1_from_modname_raw(pool, mod_name_raw)
         if sha1 is None: return -1
 
         # 5. get temp_dir
@@ -487,7 +461,8 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
             if is_str_val != 0:
                 # string DefineT (e.g. ZLIB_VERSION = "1.3.2"): register the string value
                 # (including ""), mark result_found + res_is_str so the tail skips integers.
-                self.Gen.TypeGenCDef.register_cdefine_string(pool, name, val_buf)
+                self.Gen.TypeGenCDef.register_cdefine_string(pool, name, val_buf, sha1)
+                self.Gen.TypeGenCDef.set_last_cdefine_module(sha1)
                 result_val = 0
                 result_found = 1
                 res_is_str = 1
@@ -496,8 +471,10 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
                 if string.strcmp(val_buf, "True") == 0: lval = 1
                 elif string.strcmp(val_buf, "False") == 0: lval = 0
                 else:
-                    # name reference: look up the current DefineT table (e.g. FOREGROUND_COMBO)
-                    lval = self.Gen.TypeGenCDef.lookup_cdefine_constant(val_buf)
+                    # name reference: same source module first, then the current module
+                    lval = self.Gen.TypeGenCDef.lookup_cdefine_constant(val_buf, sha1)
+                    if self.Gen.TypeGenCDef.is_cdefine_found() == 0:
+                        lval = self.Gen.TypeGenCDef.lookup_cdefine_constant(val_buf)
                     if self.Gen.TypeGenCDef.is_cdefine_found() == 0:
                         # name not registered: cannot evaluate, skip the line
                         continue
@@ -608,7 +585,9 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
                     if string.strcmp(r_buf, "True") == 0: rval = 1
                     elif string.strcmp(r_buf, "False") == 0: rval = 0
                     else:
-                        rval = self.Gen.TypeGenCDef.lookup_cdefine_constant(r_buf)
+                        rval = self.Gen.TypeGenCDef.lookup_cdefine_constant(r_buf, sha1)
+                        if self.Gen.TypeGenCDef.is_cdefine_found() == 0:
+                            rval = self.Gen.TypeGenCDef.lookup_cdefine_constant(r_buf)
                         if self.Gen.TypeGenCDef.is_cdefine_found() == 0:
                             # name not registered: cannot evaluate, skip the line
                             continue
@@ -650,7 +629,8 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
                     # constant generation; int part serves the int path (is_cdefine_double flag).
                     # 注解声明为 float 时带上 f32 种类，使用方才能直接出 f32 常量。
                     res_is_f32 = self._pyi_annot_float_kind(pyi_buf, annot_start, annot_end)
-                    self.Gen.TypeGenCDef.register_cdefine_double(pool, name, ldbl, res_is_f32)
+                    self.Gen.TypeGenCDef.register_cdefine_double(pool, name, ldbl, res_is_f32, sha1)
+                    self.Gen.TypeGenCDef.set_last_cdefine_module(sha1)
                     result_val = lval
                     result_found = 1
                     res_is_double = 1
@@ -805,39 +785,14 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
 
         stdlib.free(pyi_buf)
 
-        # 9.6 star-fallback module had no match: fall back to walking imported_modules,
-        # e.g. `from stdint import *` names stdint but SHARE_READ lives in `import win32.fileio`.
-        if result_found == 0 and imported_modules is not None:
-            im2_len: sizet = string.strlen(imported_modules)
-            im2_ci: sizet = 0
-            while im2_ci < im2_len and result_found == 0:
-                while im2_ci < im2_len and imported_modules[im2_ci] == ' ': im2_ci += 1
-                if im2_ci >= im2_len: break
-                im2_start: sizet = im2_ci
-                while im2_ci < im2_len and imported_modules[im2_ci] != ' ': im2_ci += 1
-                im2_end: sizet = im2_ci
-                im2_nlen: sizet = im2_end - im2_start
-                if im2_nlen > 0 and im2_nlen < 256:
-                    im2_buf: str = pool.alloc(im2_nlen + 1)
-                    if im2_buf is not None:
-                        for mk3 in range(int(im2_nlen)):
-                            im2_buf[mk3] = imported_modules[im2_start + mk3]
-                        im2_buf[im2_nlen] = '\0'
-                        sub_fi2: str = pool.alloc(im2_nlen + 3)
-                        if sub_fi2 is not None:
-                            sub_fi2[0] = '*'
-                            sub_fi2[1] = ':'
-                            for mk4 in range(int(im2_nlen)):
-                                sub_fi2[2 + mk4] = im2_buf[mk4]
-                            sub_fi2[2 + im2_nlen] = '\0'
-                            sub_val2: int64 = self._lookup_cross_module_cdefine(pool, name, sub_fi2, None, depth + 1, node)
-                            if self.Gen.TypeGenCDef.is_cdefine_found() != 0:
-                                result_val = sub_val2
-                                result_found = 1
+        # 9.6 removed: scanning every imported module for a bare define name is not isolation.
+        # An unqualified name must resolve through an explicit from-import; module-qualified
+        # access resolves the receiver module before lookup.
 
         # 10. cache into the current module's DefineT table and the cross-module perm_pool;
         # float CDefines are already cached as double, so only integers are written here.
         if result_found != 0:
+            if self.Gen.TypeGenCDef.get_last_cdefine_module() is None: self.Gen.TypeGenCDef.set_last_cdefine_module(sha1)
             if res_is_str != 0:
                 # string DefineT: the value was already registered in the match loop (val_buf is
                 # the hit line's content, valid across the function); only write the cross cache.
@@ -848,7 +803,8 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
                         viperlib.snprintf(ckey_s, ck_len_s, "%s@%s", name, base_mod)
                         self.Gen.TypeGenCDef.register_xmod_cdefine(ckey_s, val_buf, 0, 1)
             elif res_is_double == 0:
-                self.Gen.TypeGenCDef.register_cdefine_constant(pool, name, result_val)
+                self.Gen.TypeGenCDef.register_cdefine_constant(pool, name, result_val, 0, sha1)
+                self.Gen.TypeGenCDef.set_last_cdefine_module(sha1)
                 # cross-module cache (perm_pool, reused across files), integers: key matches the
                 # entry query "name@srcModule" (truncated base_mod, leading dots removed).
                 if base_mod is not None:
@@ -867,7 +823,7 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
                     ckey2: str = pool.alloc(ck_len2)
                     if ckey2 is not None:
                         viperlib.snprintf(ckey2, ck_len2, "%s@%s", name, base_mod)
-                        dval_cc: double = self.Gen.TypeGenCDef.lookup_cdefine_double(name)
+                        dval_cc: double = self.Gen.TypeGenCDef.lookup_cdefine_double(name, sha1)
                         if self.Gen.TypeGenCDef.is_cdefine_double() != 0:
                             cbuf_d: str = pool.alloc(64)
                             if cbuf_d is not None:
@@ -893,7 +849,7 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
         return has_upper
     # ============================================================
     # Translate a variable reference (Name node) -> load
-    def _const_int_for_cdefine(self, pool: memhub.MemBuddy*, name: str, value: int64) -> mlirlite.Value*:
+    def _const_int_for_cdefine(self, pool: memhub.MemBuddy*, name: str, value: int64, module: str = None) -> mlirlite.Value*:
         """Materialize a DefineT integer constant as an LLVM constant (TPC TypeConvert aligned)
 
         位宽优先用 define 的**已知位宽**（右侧显式强转或声明注解，见 register_cdefine_constant 的 bits）；
@@ -903,7 +859,7 @@ novirtual class ExprGenCdef(ExprGenBase.ExprGenBase):
         而小值 define 说成 8/16 也在算术提升下不会溢出。
         """
         dbits: int = 0
-        if name is not None: dbits = self.Gen.TypeGenCDef.lookup_cdefine_bits(name)
+        if name is not None: dbits = self.Gen.TypeGenCDef.lookup_cdefine_bits(name, module)
         if dbits == 8 or dbits == 16 or dbits == 32 or dbits == 64:
             return mlirlite.const_int(pool, dbits, self._cdefine_bits_value(value, dbits))
         # 无位宽记录（例如只从 .vpi 跨模块引入、未登记 bits）→ 按**推断位宽**物化：
diff --git a/App/lib/core/Gen/Expr/ExprGenName.vp b/App/lib/core/Gen/Expr/ExprGenName.vp
index 9f817b1..96fd69d 100644
--- a/App/lib/core/Gen/Expr/ExprGenName.vp
+++ b/App/lib/core/Gen/Expr/ExprGenName.vp
@@ -77,13 +77,14 @@ novirtual class ExprGenName(ExprGenBase.ExprGenBase):
                 if self.Gen.VarGen.lookup_var(trans.SymTab, nm_id) is None:
                     cdef_val: int64 = self.Gen.ExprGenCdef._lookup_cross_module_cdefine(pool, nm_id, trans._from_imports, trans._imported_modules, 0, node)
                     if self.Gen.TypeGenCDef.is_cdefine_found() != 0:
+                        xmod: str = self.Gen.TypeGenCDef.get_last_cdefine_module()
                         if self.Gen.TypeGenCDef.is_cdefine_str() != 0:
-                            cdef_sv2: str = self.Gen.TypeGenCDef.lookup_cdefine_string(nm_id)
+                            cdef_sv2: str = self.Gen.TypeGenCDef.lookup_cdefine_string(nm_id, xmod)
                             if cdef_sv2 is not None: return self.Gen.ExprGenConst.create_global_string(builder, pool, mod, cdef_sv2, trans)
                             self.Gen.TypeGenErr.fatal_error(node, f"DefineT string value missing: {nm_id}", "InternalCompilerError")
                         # Cross-module float DefineT is cached as double; return a float constant
                         # rather than a truncated integer.
-                        dchk_nm: double = self.Gen.TypeGenCDef.lookup_cdefine_double(nm_id)
+                        dchk_nm: double = self.Gen.TypeGenCDef.lookup_cdefine_double(nm_id, xmod)
                         # 同本模块路径：f32 声明的常量直接出 f32 常量（跨模块缓存已带宽度种类）。
                         if self.Gen.TypeGenCDef.is_cdefine_double() != 0:
                             if self.Gen.TypeGenCDef.is_cdefine_float32() != 0: return mlirlite.ConstFloat(pool, mlirlite.Float(pool), dchk_nm)
@@ -91,7 +92,7 @@ novirtual class ExprGenName(ExprGenBase.ExprGenBase):
                         # Same use-site width rule (cross-module DefineT)
                         uw_x: mlirlite.Value* = self.Gen.ExprGenCdef.cdefine_use_width_value(pool, node, nm_id, cdef_val, target_ty, use_ctx)
                         if uw_x is not None: return uw_x
-                        return self.Gen.ExprGenCdef._const_int_for_cdefine(pool, nm_id, cdef_val)
+                        return self.Gen.ExprGenCdef._const_int_for_cdefine(pool, nm_id, cdef_val, xmod)
 
         # DefineT lookup failed: from-import module-level globals (e.g. `from Phase2 import
         # PA_DEPS_MAX_STR`, an i64 global) are located by suffix after confirming the source module.
diff --git a/App/lib/core/Gen/Func/FuncGenDef.vp b/App/lib/core/Gen/Func/FuncGenDef.vp
index c2cf954..5f9b8bd 100644
--- a/App/lib/core/Gen/Func/FuncGenDef.vp
+++ b/App/lib/core/Gen/Func/FuncGenDef.vp
@@ -448,6 +448,9 @@ novirtual class FuncGenDef(CallGenBase.CallGenBase):
         mod: mlirlite.LLVMModule* = trans.Module
         if pool is None or mod is None: return 0
 
+        # Pre-register this module's own DefineT constants before any signature/body is
+        # translated (Translator._preregister_module_defines, before forward declarations).
+
         imported_modules: str = trans._imported_modules
         from_imports: str = trans._from_imports
         funcs_ptr: GenTypes.FuncEntry* = trans._funcs
diff --git a/App/lib/core/Gen/GenApi.vp b/App/lib/core/Gen/GenApi.vp
index b607654..4d9f57c 100644
--- a/App/lib/core/Gen/GenApi.vp
+++ b/App/lib/core/Gen/GenApi.vp
@@ -177,9 +177,9 @@ def is_cdefine_found() -> int:
 
 
 # ---------------- register_cdefine_constant (delegates to TypeGenCDef.register_cdefine_constant) ----------------
-def register_cdefine_constant(pool: memhub.MemBuddy*, name: str, value: int64, bits: int = 0):
-    """Delegate to gen.register_cdefine_constant (bits: 0=未知；8/16/32/64=已知位宽)"""
-    if _g_gen is not None: _g_gen.TypeGenCDef.register_cdefine_constant(pool, name, value, bits)
+def register_cdefine_constant(pool: memhub.MemBuddy*, name: str, value: int64, bits: int = 0, module: str = None):
+    """Delegate to gen.register_cdefine_constant (bits: 0=未知；8/16/32/64=已知位宽; module: source SHA1)"""
+    if _g_gen is not None: _g_gen.TypeGenCDef.register_cdefine_constant(pool, name, value, bits, module)
 
 
 # ---------------- cdefine_decl_bits (delegates to AssignGenMixin.cdefine_decl_bits) ----------------
@@ -191,9 +191,9 @@ def cdefine_decl_bits(pool: memhub.MemBuddy*, annot: ast.AST*, value_node: ast.A
 
 
 # ---------------- register_cdefine_double (delegates to TypeGenCDef.register_cdefine_double) ----------------
-def register_cdefine_double(pool: memhub.MemBuddy*, name: str, value: double, is_f32: int = 0):
-    """Delegate to gen.register_cdefine_double (is_f32: 1=float 声明，0=double)"""
-    if _g_gen is not None: _g_gen.TypeGenCDef.register_cdefine_double(pool, name, value, is_f32)
+def register_cdefine_double(pool: memhub.MemBuddy*, name: str, value: double, is_f32: int = 0, module: str = None):
+    """Delegate to gen.register_cdefine_double (is_f32: 1=float 声明，0=double; module: source SHA1)"""
+    if _g_gen is not None: _g_gen.TypeGenCDef.register_cdefine_double(pool, name, value, is_f32, module)
 
 
 # ---------------- cdefine_decl_float_bits (delegates to AssignGenMixin.cdefine_decl_float_bits) ----------------
@@ -204,6 +204,12 @@ def cdefine_decl_float_bits(pool: memhub.MemBuddy*, annot: ast.AST*) -> int:
     return 0
 
 
+# ---------------- register_cdefine_from_ast (delegates to AssignGenMixin._register_cdefine_from_value) ----------------
+def register_cdefine_from_ast(pool: memhub.MemBuddy*, name: str, val_node: ast.AST*, annot: ast.AST* = None):
+    """Evaluate and register one module-level define from its AST value."""
+    if _g_gen is not None: _g_gen.AssignGen._register_cdefine_from_value(pool, name, val_node, annot)
+
+
 # ---------------- is_cdefine_annotation (delegates to AssignGenMixin.is_cdefine_annotation) ----------------
 def is_cdefine_annotation(annot: ast.AST*) -> int:
     """Delegate to gen.is_cdefine_annotation"""
diff --git a/App/lib/core/Gen/ImportsGenMixin.vp b/App/lib/core/Gen/ImportsGenMixin.vp
index 9f135e7..1f50584 100644
--- a/App/lib/core/Gen/ImportsGenMixin.vp
+++ b/App/lib/core/Gen/ImportsGenMixin.vp
@@ -264,6 +264,46 @@ novirtual class ImportsGenMixin:
             while ci < total_len and cur[ci] != ' ': ci += 1
         return None
 
+    # lookup_from_import_last - like lookup_from_import, but the LAST matching entry wins
+    # (Python name binding: a later from-import shadows an earlier one). Used for DefineT
+    # resolution so `from a import X; from b import X` resolves to b, not a.
+    def lookup_from_import_last(self, from_imports: str, name: str) -> str:
+        """Return the module of the last exact (else last star) from-import for name."""
+        if name is None or from_imports is None: return None
+        name_len: sizet = string.strlen(name)
+        cur: str = from_imports
+        ci: sizet = 0
+        total_len: sizet = string.strlen(from_imports)
+        last_exact: str = None
+        last_star: str = None
+        while ci < total_len:
+            while ci < total_len and cur[ci] == ' ': ci += 1
+            if ci >= total_len: break
+            colon_pos: sizet = ci
+            while colon_pos < total_len and cur[colon_pos] != ':' and cur[colon_pos] != ' ': colon_pos += 1
+            if colon_pos >= total_len or cur[colon_pos] != ':': break
+            entry_name_len: sizet = colon_pos - ci
+            if entry_name_len == 1 and cur[ci] == '*':
+                mod_start: sizet = colon_pos + 1
+                mod_end: sizet = mod_start
+                while mod_end < total_len and cur[mod_end] != ' ' and cur[mod_end] != '\0' and cur[mod_end] != ':': mod_end += 1
+                if mod_end > mod_start: last_star = cur + mod_start
+            elif entry_name_len == name_len:
+                matched: int = 1
+                for ei in range(int(name_len)):
+                    if cur[ci + ei] != name[ei]:
+                        matched = 0
+                        break
+                if matched != 0:
+                    mod_start2: sizet = colon_pos + 1
+                    mod_end2: sizet = mod_start2
+                    while mod_end2 < total_len and cur[mod_end2] != ' ' and cur[mod_end2] != '\0' and cur[mod_end2] != ':': mod_end2 += 1
+                    if mod_end2 > mod_start2: last_exact = cur + mod_start2
+            ci = colon_pos
+            while ci < total_len and cur[ci] != ' ': ci += 1
+        if last_exact is not None: return last_exact
+        return last_star
+
     # Look up a from-import name and return the module name, or None.
     # allow_star_fallback=1 permits a star-import fallback; pass 0 to disable it.
     def lookup_from_import(self, from_imports: str, name: str, allow_star_fallback: int = 1) -> str:
diff --git a/App/lib/core/Gen/Translator.vp b/App/lib/core/Gen/Translator.vp
index 010a2a4..c998451 100644
--- a/App/lib/core/Gen/Translator.vp
+++ b/App/lib/core/Gen/Translator.vp
@@ -559,6 +559,9 @@ novirtual class Translator:
                 GenApi.push_trace(GenApi.get_current_file(), cur_imp_lineno)
                 StubMergerBuild.LoadDepVpiIntoModule(pool, mod, self._imported_modules, self._from_imports, GenApi.get_temp_dir(), self)
                 GenApi.pop_trace()
+            # Register the module's own DefineT constants before any class/function body is
+            # translated, so a define may be used above its declaration line.
+            self._preregister_module_defines(pool, tree)
             # File-level class pre-registration already ran at the top of this function.
             # Module var pre-registration + forward declarations run only in full translation.
             if self._declare_only == 0:
@@ -720,6 +723,23 @@ novirtual class Translator:
         if erased != 0: tree.children = kept
         return erased
 
+    # _preregister_module_defines - evaluate/register all top-level DefineT constants early.
+    # Runs in declare-only and full translation, so signatures (array sizes) and bodies that
+    # appear above the define line can use it. Values stay in the current module's namespace.
+    def _preregister_module_defines(self, pool: memhub.MemBuddy*, tree: ast.AST*):
+        if tree is None or tree.children is None: return
+        ch: list[ast.AST*]* = tree.children
+        for ci in range(int(len(ch))):
+            child: ast.AST* = ch.get(ci)
+            if child is None or child.kind() != ast.ASTKind.AnnAssign: continue
+            aa: ast.AnnAssign* = ast.AnnAssign*(child)
+            if aa is None or aa.target is None or aa.value is None or aa.annotation is None: continue
+            if aa.target.kind() != ast.ASTKind.Name: continue
+            nm: ast.Name* = ast.Name*(aa.target)
+            if nm.id is None: continue
+            if GenApi.is_cdefine_annotation(aa.annotation) == 0: continue
+            GenApi.register_cdefine_from_ast(pool, nm.id, aa.value, aa.annotation)
+
     # Auto container visibility injection (mirrors TPC _inject_auto_imports): mark list/dict classes
     # visible so bare annotations/constructors resolve. Detects AnnAssign annotation, Call.func, Subscript.value.
     def _inject_auto_container_visibility(self, pool: memhub.MemBuddy*, tree: ast.AST*):
diff --git a/App/lib/core/Gen/Type/TypeGenBase.vp b/App/lib/core/Gen/Type/TypeGenBase.vp
index b181a44..9202b52 100644
--- a/App/lib/core/Gen/Type/TypeGenBase.vp
+++ b/App/lib/core/Gen/Type/TypeGenBase.vp
@@ -40,6 +40,9 @@ novirtual class TypeGenBase:
 
     # --- Global DefineT compile-time constant table (was _g_cdefine_*) ---
     CDefineNames: list[str]*
+    # Source module of each entry ("" = declared in the current module). Cross-module values
+    # are only reachable through the (name, module) pair, so same-name defines stay isolated.
+    CDefineMods: list[str]*
     CDefineValues: list[str]*
     # 浮点常量的**宽度种类**：1=f64(double，默认)，2=f32(float)；0=非浮点（整型/字符串）。
     # 判定"是不是浮点常量"一律用 `!= 0`（既有调用处口径不变），只有浮点常量物化处区分 64/32：
@@ -61,6 +64,7 @@ novirtual class TypeGenBase:
     # 值与 CDefineValues 分开存：名字不变，值是 '\n' 连接的元素串（元素内不含换行），
     # 供 `*OTHER_LIST` 解包与后续编译期消费者读取。与 CDefineNames 同池同生命周期。
     CDefineListNames: list[str]*
+    CDefineListMods: list[str]*
     CDefineListValues: list[str]*
 
     # --- Cross-module DefineT lookup cache (PermPool-allocated, reused across files) ---
@@ -70,6 +74,8 @@ novirtual class TypeGenBase:
     # 同 CDefineDoubleFlags 的编码：1=f64，2=f32，0=非浮点。
     XmodCdefDoubleFlags: list[int]*
     XmodCdefStrFlags: list[int]*
+    # Module that produced the last successful cross-module DefineT hit ("" = local/unknown).
+    CDefineLastModule: str
 
     # --- Current module SHA1 (was _g_current_module_sha1) ---
     CurrentModuleSha1: str
@@ -125,6 +131,7 @@ novirtual class TypeGenBase:
         self.GenericCtxStack = None
         self.GenericCtxDepth = 0
         self.CDefineNames = None
+        self.CDefineMods = None
         self.CDefineValues = None
         self.CDefineDoubleFlags = None
         self.CDefineStrFlags = None
@@ -139,6 +146,7 @@ novirtual class TypeGenBase:
         self.XmodCdefValues = None
         self.XmodCdefDoubleFlags = None
         self.XmodCdefStrFlags = None
+        self.CDefineLastModule = None
         self.CurrentModuleSha1 = None
         self.CTypedefNames = None
         self.CTypedefTypeStrs = None
diff --git a/App/lib/core/Gen/Type/TypeGenCDef.vp b/App/lib/core/Gen/Type/TypeGenCDef.vp
index b2840a5..95a06ee 100644
--- a/App/lib/core/Gen/Type/TypeGenCDef.vp
+++ b/App/lib/core/Gen/Type/TypeGenCDef.vp
@@ -103,25 +103,51 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
         if CompilerFactory.factory is not None and CompilerFactory.factory.PermPool is not None: return CompilerFactory.factory.PermPool
         return pool
 
-    def register_cdefine_constant(self, pool: memhub.MemBuddy*, name: str, value: int64, bits: int = 0) -> None:
+    def _cdef_module_copy(self, pool: memhub.MemBuddy*, module: str) -> str:
+        """Deep-copy the source module for a table entry; None/"" -> empty (current module)."""
+        if module is None or module[0] == '\0': return ""
+        n: sizet = string.strlen(module)
+        c: str = pool.alloc(n + 1)
+        if c is None: return ""
+        string.strcpy(c, module)
+        return c
+
+    def _cdef_module_match(self, index: sizet, module: str) -> int:
+        """1 when entry index belongs to module ("" / None = the current module)."""
+        if self.CDefineMods is None or index >= len(self.CDefineMods): return 0
+        em: str = self.CDefineMods.get(index)
+        if module is None or module[0] == '\0': return 1 if (em is None or em[0] == '\0') else 0
+        if em is None or em[0] == '\0': return 0
+        return 1 if string.strcmp(em, module) == 0 else 0
+
+    def set_last_cdefine_module(self, module: str) -> None:
+        self.CDefineLastModule = module
+
+    def get_last_cdefine_module(self) -> str:
+        return self.CDefineLastModule
+
+    def register_cdefine_constant(self, pool: memhub.MemBuddy*, name: str, value: int64, bits: int = 0, module: str = None) -> None:
         """Register an integer DefineT constant; store the value as a decimal string.
 
         bits: 值表达式的位宽（0=未知，按值推断；8/16/32/64 = 显式强转或声明注解给出的位宽）。
+        module: source module for a cross-module value; None/"" means the current module.
         """
         if name is None: return
         if self.CDefineNames is None:
             tp: memhub.MemBuddy* = self._cdefine_table_pool(pool)
             tn: list[str]* = list[str](tp, 64)
+            tm: list[str]* = list[str](tp, 64)
             tv: list[str]* = list[str](tp, 64)
             td: list[int]* = list[int](tp, 64)
             tsf: list[int]* = list[int](tp, 64)
             tbits: list[int]* = list[int](tp, 64)
             # Table build failed (pool unusable/exhausted): report and return, never let the
             # append below hit None or an uninitialized address (would write NULL/0xCD).
-            if tn is None or tv is None or td is None or tsf is None or tbits is None:
+            if tn is None or tm is None or tv is None or td is None or tsf is None or tbits is None:
                 self.Gen.TypeGenErr.fatal_error(None, "DefineT table allocation failed (table body pool unavailable or exhausted)", "MemoryError")
                 return
             self.CDefineNames = tn
+            self.CDefineMods = tm
             self.CDefineValues = tv
             self.CDefineDoubleFlags = td
             self.CDefineStrFlags = tsf
@@ -129,7 +155,7 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
             self._cdef_idx_init(tp)
         # Table-ready guard: missing/half-initialized body -> fail-fast, no garbage writes
         # (assert non-null before append).
-        if self.CDefineNames is None or self.CDefineValues is None or self.CDefineDoubleFlags is None or self.CDefineStrFlags is None or self.CDefineBits is None:
+        if self.CDefineNames is None or self.CDefineMods is None or self.CDefineValues is None or self.CDefineDoubleFlags is None or self.CDefineStrFlags is None or self.CDefineBits is None:
             self.Gen.TypeGenErr.fatal_error(None, "DefineT table not ready (CDefineNames/Values/Flags is empty)", "MemoryError")
             return
         name_copy: str = pool.alloc(string.strlen(name) + 1)
@@ -138,6 +164,7 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
             return
         string.strcpy(name_copy, name)
         self.CDefineNames.append(name_copy)
+        self.CDefineMods.append(self._cdef_module_copy(pool, module))
         self._cdef_idx_sync_append(name_copy)
         val_buf: str = pool.alloc(32)
         if val_buf is not None:
@@ -150,31 +177,34 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
         if self.CDefineDoubleFlags is not None: self.CDefineDoubleFlags.append(0)
         if self.CDefineStrFlags is not None: self.CDefineStrFlags.append(0)
         if self.CDefineBits is not None: self.CDefineBits.append(bits)
-    def register_cdefine_double(self, pool: memhub.MemBuddy*, name: str, value: double, is_f32: int = 0) -> None:
+    def register_cdefine_double(self, pool: memhub.MemBuddy*, name: str, value: double, is_f32: int = 0, module: str = None) -> None:
         """Register a float DefineT constant; store the value as %f text and flag it.
 
         is_f32: 1 表示该常量声明为 32 位 float（`define PI: float = ...` / `float(...)`），
         物化时直接出 f32 常量；0（默认）表示 double。
+        module: source module for a cross-module value; None/"" means the current module.
         """
         if name is None: return
         if self.CDefineNames is None:
             tp: memhub.MemBuddy* = self._cdefine_table_pool(pool)
             tn: list[str]* = list[str](tp, 64)
+            tm: list[str]* = list[str](tp, 64)
             tv: list[str]* = list[str](tp, 64)
             td: list[int]* = list[int](tp, 64)
             tsf: list[int]* = list[int](tp, 64)
             tbits: list[int]* = list[int](tp, 64)
-            if tn is None or tv is None or td is None or tsf is None or tbits is None:
+            if tn is None or tm is None or tv is None or td is None or tsf is None or tbits is None:
                 self.Gen.TypeGenErr.fatal_error(None, "DefineT float table allocation failed (table body pool unavailable or exhausted)", "MemoryError")
                 return
             self.CDefineNames = tn
+            self.CDefineMods = tm
             self.CDefineValues = tv
             self.CDefineDoubleFlags = td
             self.CDefineStrFlags = tsf
             self.CDefineBits = tbits
             self._cdef_idx_init(tp)
         # Table-ready guard (same as register_cdefine_constant): assert non-null before append
-        if self.CDefineNames is None or self.CDefineValues is None or self.CDefineDoubleFlags is None or self.CDefineStrFlags is None or self.CDefineBits is None:
+        if self.CDefineNames is None or self.CDefineMods is None or self.CDefineValues is None or self.CDefineDoubleFlags is None or self.CDefineStrFlags is None or self.CDefineBits is None:
             self.Gen.TypeGenErr.fatal_error(None, "DefineT float table not ready (CDefineNames/Values/Flags is empty)", "MemoryError")
             return
         name_copy_d: str = pool.alloc(string.strlen(name) + 1)
@@ -183,6 +213,7 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
             return
         string.strcpy(name_copy_d, name)
         self.CDefineNames.append(name_copy_d)
+        self.CDefineMods.append(self._cdef_module_copy(pool, module))
         self._cdef_idx_sync_append(name_copy_d)
         val_buf: str = pool.alloc(32)
         if val_buf is not None:
@@ -201,8 +232,11 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
         if val_buf is None:
             VLogger.error("DefineT float value buffer allocation failed", "CDEF-DBG")
             self.Gen.TypeGenErr.fatal_error(None, "DefineT float value buffer allocation failed", "MemoryError")
-    def register_cdefine_string(self, pool: memhub.MemBuddy*, name: str, value: str) -> None:
-        """Register a string DefineT constant, deep-copying name and value into pool."""
+    def register_cdefine_string(self, pool: memhub.MemBuddy*, name: str, value: str, module: str = None) -> None:
+        """Register a string DefineT constant, deep-copying name and value into pool.
+
+        module: source module for a cross-module value; None/"" means the current module.
+        """
         if pool is None or name is None: return
         if value is None:
             self.Gen.TypeGenErr.fatal_error(None, f"DefineT string value missing: {name}", "InternalCompilerError")
@@ -210,21 +244,23 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
         if self.CDefineNames is None:
             tp: memhub.MemBuddy* = self._cdefine_table_pool(pool)
             tn: list[str]* = list[str](tp, 64)
+            tm: list[str]* = list[str](tp, 64)
             tv: list[str]* = list[str](tp, 64)
             td: list[int]* = list[int](tp, 64)
             tsf: list[int]* = list[int](tp, 64)
             tbits: list[int]* = list[int](tp, 64)
-            if tn is None or tv is None or td is None or tsf is None or tbits is None:
+            if tn is None or tm is None or tv is None or td is None or tsf is None or tbits is None:
                 self.Gen.TypeGenErr.fatal_error(None, "DefineT string table allocation failed (table body pool unavailable or exhausted)", "MemoryError")
                 return
             self.CDefineNames = tn
+            self.CDefineMods = tm
             self.CDefineValues = tv
             self.CDefineDoubleFlags = td
             self.CDefineStrFlags = tsf
             self.CDefineBits = tbits
             self._cdef_idx_init(tp)
         # Table-ready guard (same as register_cdefine_constant): assert non-null before append
-        if self.CDefineNames is None or self.CDefineValues is None or self.CDefineDoubleFlags is None or self.CDefineStrFlags is None or self.CDefineBits is None:
+        if self.CDefineNames is None or self.CDefineMods is None or self.CDefineValues is None or self.CDefineDoubleFlags is None or self.CDefineStrFlags is None or self.CDefineBits is None:
             self.Gen.TypeGenErr.fatal_error(None, "DefineT string table not ready (CDefineNames/Values/Flags is empty)", "MemoryError")
             return
         ncopy_s: str = pool.alloc(string.strlen(name) + 1)
@@ -233,6 +269,7 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
             return
         string.strcpy(ncopy_s, name)
         self.CDefineNames.append(ncopy_s)
+        self.CDefineMods.append(self._cdef_module_copy(pool, module))
         self._cdef_idx_sync_append(ncopy_s)
         vlen: sizet = string.strlen(value)
         vcopy: str = pool.alloc(vlen + 1)
@@ -248,7 +285,7 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
         # Cross-module string DefineT reads call this + set_cdefine_found; missing the flag degrades to int 0 -> NULL crash.
         self.CDefineIsStr = 1
         self.CDefineFound = 1
-    def register_cdefine_string_list(self, pool: memhub.MemBuddy*, name: str, joined: str) -> None:
+    def register_cdefine_string_list(self, pool: memhub.MemBuddy*, name: str, joined: str, module: str = None) -> None:
         """Register a macro-list DefineT constant (`define NAME = [...]`, '\n'-joined value).
 
         The list is compile-time only: no LLVM global is created (an unannotated module-level
@@ -260,13 +297,15 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
         if tp is None:
             self.Gen.TypeGenErr.fatal_error(None, "DefineT list table pool unavailable", "MemoryError")
             return
-        if self.CDefineListNames is None or self.CDefineListValues is None:
+        if self.CDefineListNames is None or self.CDefineListMods is None or self.CDefineListValues is None:
             ln_l: list[str]* = list[str](tp, 16)
+            lm_l: list[str]* = list[str](tp, 16)
             lv_l: list[str]* = list[str](tp, 16)
-            if ln_l is None or lv_l is None:
+            if ln_l is None or lm_l is None or lv_l is None:
                 self.Gen.TypeGenErr.fatal_error(None, "DefineT list table allocation failed", "MemoryError")
                 return
             self.CDefineListNames = ln_l
+            self.CDefineListMods = lm_l
             self.CDefineListValues = lv_l
         nlen_l: sizet = string.strlen(name)
         ncopy_l: str = tp.alloc(nlen_l + 1)
@@ -281,16 +320,18 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
             return
         string.strcpy(vcopy_l, joined)
         self.CDefineListNames.append(ncopy_l)
+        self.CDefineListMods.append(self._cdef_module_copy(tp, module))
         self.CDefineListValues.append(vcopy_l)
 
-    def lookup_cdefine_string_list(self, name: str) -> str:
+    def lookup_cdefine_string_list(self, name: str, module: str = None) -> str:
         """Return the '\n'-joined value of a macro-list DefineT constant; None if absent."""
-        if name is None or self.CDefineListNames is None or self.CDefineListValues is None: return None
+        if name is None or self.CDefineListNames is None or self.CDefineListMods is None or self.CDefineListValues is None: return None
         n_l: sizet = len(self.CDefineListNames)
         for i in range(int(n_l)):
             nm_l: str = self.CDefineListNames.get(sizet(i))
             if nm_l is not None and string.strcmp(nm_l, name) == 0:
-                return self.CDefineListValues.get(sizet(i))
+                if self._cdef_module_match(i, module) != 0:
+                    return self.CDefineListValues.get(sizet(i))
         return None
 
     # Cross-module DefineT lookup cache (PermPool-allocated, reused across files)
@@ -347,26 +388,34 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
                         self.CDefineIsDouble = int(self.XmodCdefDoubleFlags.get(i))
                     return val_str
         return None
-    def lookup_cdefine_constant(self, name: str) -> int64:
-        """Look up an integer DefineT constant; 64-bit exact, found flag distinguishes -1."""
+    def lookup_cdefine_constant(self, name: str, module: str = None) -> int64:
+        """Look up an integer DefineT constant; 64-bit exact, found flag distinguishes -1.
+
+        module=None/"" matches only defines declared in the current module; a non-empty module
+        matches only that source module's entry (strong cross-module isolation).
+        """
         self.CDefineFound = 0
         self.CDefineIsDouble = 0
         self.CDefineIsStr = 0
-        if self.CDefineNames is None: return 0
+        if self.CDefineNames is None or self.CDefineMods is None: return 0
         n: sizet = len(self.CDefineNames)
         i: sizet
-        # Name-index fast path: when trusted (Built==n and name non-null) locate the single candidate
-        # (== first scan hit); if unavailable fall back to the full linear scan below.
+        # Name-index fast path: only for current-module (bare) lookups; a module-qualified
+        # lookup must scan because the same name may exist in several modules.
         cd_start: sizet = 0
         cd_end: sizet = n
-        if name is not None and self.CDefineNameIdxBuilt == int(n) and self.CDefineNameIdx is not None and self.CDefineNameIdxCap > 0:
-            cd_hit: int = self._cdef_idx_find(name)
-            if cd_hit < 0: return 0
-            cd_start = sizet(cd_hit)
-            cd_end = sizet(cd_hit + 1)
+        if module is None or module[0] == '\0':
+            if name is not None and self.CDefineNameIdxBuilt == int(n) and self.CDefineNameIdx is not None and self.CDefineNameIdxCap > 0:
+                cd_hit: int = self._cdef_idx_find(name)
+                if cd_hit < 0: return 0
+                # The index points at the first same-name entry, which may belong to another
+                # module; only narrow when it is a current-module entry, else scan all.
+                if self._cdef_module_match(sizet(cd_hit), module) != 0:
+                    cd_start = sizet(cd_hit)
+                    cd_end = sizet(cd_hit + 1)
         for i in range(int(cd_start), int(cd_end)):
             nm: str = self.CDefineNames.get(i)
-            if nm is not None and string.strcmp(nm, name) == 0:
+            if nm is not None and string.strcmp(nm, name) == 0 and self._cdef_module_match(i, module) != 0:
                 val_str: str = self.CDefineValues.get(i)
                 if val_str is not None:
                     self.CDefineFound = 1
@@ -381,14 +430,14 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
                         return string.atoll(val_str)
                     return string.atoll(val_str)
         return 0
-    def lookup_cdefine_bits(self, name: str) -> int:
+    def lookup_cdefine_bits(self, name: str, module: str = None) -> int:
         """Look up a DefineT constant's value-expression bit width; 0 = unknown (width inferred by value).
 
         同一名字可能被注册**多次**：本模块注册带位宽（如 WORD(...) 或声明注解），而 stub/.vpi
         等路径以 bits=0 注册。若用「命中即返回」，哈希索引先命中的可能是那条 0 位宽记录，
         于是已知位宽被丢掉、常量被物化成 i32。故这里**全表扫描并优先返回非 0 位宽**。
         """
-        if self.CDefineNames is None or self.CDefineBits is None or name is None: return 0
+        if self.CDefineNames is None or self.CDefineMods is None or self.CDefineBits is None or name is None: return 0
         n: sizet = len(self.CDefineNames)
         # 同一名字可能被注册多次：stub/.vpi 等早期路径先注册（位宽可能未知 → 兜底值），
         # 本模块自己的 define 翻译在后（注解/强转齐全，最权威）。故取**最后**一条非零记录，
@@ -397,31 +446,32 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
         for i in range(int(n)):
             nm: str = self.CDefineNames.get(i)
             if nm is None or string.strcmp(nm, name) != 0: continue
+            if self._cdef_module_match(i, module) == 0: continue
             if sizet(i) >= len(self.CDefineBits): continue
             b: int = self.CDefineBits.get(i)
             if b != 0: found = b
         return found
-    def lookup_cdefine_double(self, name: str) -> double:
+    def lookup_cdefine_double(self, name: str, module: str = None) -> double:
         """Look up a DefineT constant and return its double value (float or int)."""
         self.CDefineFound = 0
         self.CDefineIsDouble = 0
         self.CDefineIsStr = 0
-        if self.CDefineNames is None: return 0.0
+        if self.CDefineNames is None or self.CDefineMods is None: return 0.0
         n: sizet = len(self.CDefineNames)
         i: sizet
-        # Name-index fast path: when trusted (Built==n and name non-null) locate the single candidate
-        # (== first scan hit); if unavailable fall back to the full linear scan below.
         cd_start: sizet = 0
         cd_end: sizet = n
-        if name is not None and self.CDefineNameIdxBuilt == int(n) and self.CDefineNameIdx is not None and self.CDefineNameIdxCap > 0:
-            cd_hit: int = self._cdef_idx_find(name)
-            if cd_hit < 0: return 0.0
-            cd_start = sizet(cd_hit)
-            cd_end = sizet(cd_hit + 1)
+        if module is None or module[0] == '\0':
+            if name is not None and self.CDefineNameIdxBuilt == int(n) and self.CDefineNameIdx is not None and self.CDefineNameIdxCap > 0:
+                cd_hit: int = self._cdef_idx_find(name)
+                if cd_hit < 0: return 0.0
+                if self._cdef_module_match(sizet(cd_hit), module) != 0:
+                    cd_start = sizet(cd_hit)
+                    cd_end = sizet(cd_hit + 1)
         for i in range(int(cd_start), int(cd_end)):
             nm: str = self.CDefineNames.get(i)
             # Fast path: strcmp equality implies equal first char, so skip strcmp when it differs.
-            if nm is not None and nm[0] == name[0] and string.strcmp(nm, name) == 0:
+            if nm is not None and nm[0] == name[0] and string.strcmp(nm, name) == 0 and self._cdef_module_match(i, module) != 0:
                 val_str: str = self.CDefineValues.get(i)
                 if val_str is not None:
                     self.CDefineFound = 1
@@ -436,26 +486,26 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
                     ret_i2: double = double(string.atoll(val_str))
                     return ret_i2
         return 0.0
-    def lookup_cdefine_string(self, name: str) -> str:
+    def lookup_cdefine_string(self, name: str, module: str = None) -> str:
         """Look up a string DefineT value (valid when found=1 and is_str=1)."""
         self.CDefineFound = 0
         self.CDefineIsDouble = 0
         self.CDefineIsStr = 0
-        if self.CDefineNames is None: return None
+        if self.CDefineNames is None or self.CDefineMods is None: return None
         n: sizet = len(self.CDefineNames)
         i: sizet
-        # Name-index fast path: when trusted (Built==n and name non-null) locate the single candidate
-        # (== first scan hit); if unavailable fall back to the full linear scan below.
         cd_start: sizet = 0
         cd_end: sizet = n
-        if name is not None and self.CDefineNameIdxBuilt == int(n) and self.CDefineNameIdx is not None and self.CDefineNameIdxCap > 0:
-            cd_hit: int = self._cdef_idx_find(name)
-            if cd_hit < 0: return None
-            cd_start = sizet(cd_hit)
-            cd_end = sizet(cd_hit + 1)
+        if module is None or module[0] == '\0':
+            if name is not None and self.CDefineNameIdxBuilt == int(n) and self.CDefineNameIdx is not None and self.CDefineNameIdxCap > 0:
+                cd_hit: int = self._cdef_idx_find(name)
+                if cd_hit < 0: return None
+                if self._cdef_module_match(sizet(cd_hit), module) != 0:
+                    cd_start = sizet(cd_hit)
+                    cd_end = sizet(cd_hit + 1)
         for i in range(int(cd_start), int(cd_end)):
             nm: str = self.CDefineNames.get(i)
-            if nm is not None and string.strcmp(nm, name) == 0:
+            if nm is not None and string.strcmp(nm, name) == 0 and self._cdef_module_match(i, module) != 0:
                 val_str: str = self.CDefineValues.get(i)
                 if val_str is not None:
                     self.CDefineFound = 1
@@ -491,6 +541,7 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
     def clear_cdefine_constants(self) -> None:
         """Clear the DefineT table body in place, keeping the PermPool table pointers."""
         if self.CDefineNames is not None: self.CDefineNames.clear()
+        if self.CDefineMods is not None: self.CDefineMods.clear()
         if self.CDefineValues is not None: self.CDefineValues.clear()
         if self.CDefineDoubleFlags is not None: self.CDefineDoubleFlags.clear()
         if self.CDefineStrFlags is not None: self.CDefineStrFlags.clear()
@@ -498,7 +549,9 @@ novirtual class TypeGenCDef(TypeGenBase.TypeGenBase):
         # Macro-list table is per-file too: a stale entry would let `*NAME` resolve a list that
         # belongs to another file's compilation unit.
         if self.CDefineListNames is not None: self.CDefineListNames.clear()
+        if self.CDefineListMods is not None: self.CDefineListMods.clear()
         if self.CDefineListValues is not None: self.CDefineListValues.clear()
+        self.CDefineLastModule = None
         # Clear index slots (store index+1; 0=empty) and reset Built to 0 (empty table and index
         # in sync, matching a freshly built table before its first register).
         if self.CDefineNameIdx is not None and self.CDefineNameIdxCap > 0: