Add allFunctionsGlobal and allConstantsGlobal options

config.xsd

@@ -46,6 +46,8 @@
         <xs:attribute name="ensureOverrideAttribute" type="xs:boolean" default="false" />
         <xs:attribute name="findUnusedCode" type="xs:boolean" default="true" />
         <xs:attribute name="disallowLiteralKeysOnUnshapedArrays" type="xs:boolean" default="false" />
+        <xs:attribute name="allFunctionsGlobal" type="xs:boolean" default="false" />
+        <xs:attribute name="allConstantsGlobal" type="xs:boolean" default="false" />
         <xs:attribute name="findUnusedVariablesAndParams" type="xs:boolean" default="false" />
         <xs:attribute name="findUnusedPsalmSuppress" type="xs:boolean" default="false" />
         <xs:attribute name="findUnusedBaselineEntry" type="xs:boolean" default="true" />

docs/running_psalm/configuration.md

@@ -257,6 +257,23 @@ When `true`, Psalm will attempt to find all unused code (including unused variab
 ```
 When `true`, Psalm will emit issues when using literal keys on unshaped arrays (useful to enforce usage of shaped arrays). Defaults to `false`.
 
+#### allFunctionsGlobal
+```xml
+<psalm
+  allFunctionsGlobal="[bool]"
+>
+```
+When `true`, Psalm will treat all functions declared in scanned files as available to all files, even if they aren't loaded by the Composer autoloader (useful for legacy codebases which make heavy use of `require`/`include`, instead of Composer's autoloader). Defaults to `false`.
+
+#### allConstantsGlobal
+```xml
+<psalm
+  allConstantsGlobal="[bool]"
+>
+```
+
+When `true`, Psalm will treat all constants declared in scanned files as available to all files, even if they aren't loaded by the Composer autoloader (useful for legacy codebases which make heavy use of `require`/`include`, instead of Composer's autoloader). Defaults to `false`.
+
 #### findUnusedPsalmSuppress
 ```xml
 <psalm

psalm-baseline.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="6.x-dev@897f124d9f0034b025e246809077e828f3537f7f">
+<files psalm-version="6.x-dev@d5ee11cc5a050760e4ac0b0801f43c3780a66fda">
   <file src="examples/TemplateChecker.php">
     <PossiblyUndefinedIntArrayOffset>
       <code><![CDATA[$comment_block->tags['variablesfrom'][0]]]></code>
@@ -61,6 +61,9 @@
     <PossiblyNullReference>
       <code><![CDATA[addAttribute]]></code>
     </PossiblyNullReference>
+    <PossiblyUnusedMethod>
+      <code><![CDATA[hasStubFile]]></code>
+    </PossiblyUnusedMethod>
     <PropertyTypeCoercion>
       <code><![CDATA[$this]]></code>
     </PropertyTypeCoercion>
@@ -1263,7 +1266,6 @@
     <RiskyTruthyFalsyComparison>
       <code><![CDATA[$composer_file_path]]></code>
       <code><![CDATA[$function_storage->cased_name]]></code>
-      <code><![CDATA[$function_storage->cased_name]]></code>
     </RiskyTruthyFalsyComparison>
   </file>
   <file src="src/Psalm/Internal/Codebase/TaintFlowGraph.php">

psalm.xml.dist

@@ -11,6 +11,8 @@
     xsi:schemaLocation="https://getpsalm.org/schema/config config.xsd"
     limitMethodComplexity="true"
     errorBaseline="psalm-baseline.xml"
+    allFunctionsGlobal="true"
+    allConstantsGlobal="true"
     findUnusedPsalmSuppress="true"
     findUnusedBaselineEntry="true"
     findUnusedIssueHandlerSuppression="true"

src/Psalm/Codebase.php

@@ -150,6 +150,10 @@ final class Codebase
      */
     public bool $register_stub_files = false;
 
+    public bool $all_functions_global = false;
+
+    public bool $all_constants_global = false;
+
     public bool $find_unused_variables = false;
 
     public Scanner $scanner;
@@ -585,6 +589,14 @@ public function getStubbedConstantType(string $const_id): ?Union
         return self::$stubbed_constants[$const_id] ?? null;
     }
 
+    /**
+     * @param array<string, Union> $stubs
+     */
+    public function addGlobalConstantTypes(array $stubs): void
+    {
+        self::$stubbed_constants += $stubs;
+    }
+
     /**
      * @return array<string, Union>
      */

src/Psalm/Config.php

@@ -398,6 +398,10 @@ final class Config
 
     public bool $literal_array_key_check = false;
 
+    public bool $all_functions_global = false;
+
+    public bool $all_constants_global = false;
+
     public int $max_graph_size = 200;
 
     public int $max_avg_path_length = 70;
@@ -1111,6 +1115,16 @@ private static function fromXmlAndPaths(
             $config->literal_array_key_check = $attribute_text === 'true' || $attribute_text === '1';
         }
 
+        if (isset($config_xml['allFunctionsGlobal'])) {
+            $attribute_text = (string) $config_xml['allFunctionsGlobal'];
+            $config->all_functions_global = $attribute_text === 'true' || $attribute_text === '1';
+        }
+
+        if (isset($config_xml['allConstantsGlobal'])) {
+            $attribute_text = (string) $config_xml['allConstantsGlobal'];
+            $config->all_constants_global = $attribute_text === 'true' || $attribute_text === '1';
+        }
+
         if (isset($config_xml['findUnusedVariablesAndParams'])) {
             $attribute_text = (string) $config_xml['findUnusedVariablesAndParams'];
             $config->find_unused_variables = $attribute_text === 'true' || $attribute_text === '1';

src/Psalm/Internal/Analyzer/Statements/Expression/CallAnalyzer.php

@@ -612,7 +612,8 @@ public static function checkFunctionExists(
             } else {
                 IssueBuffer::maybeAdd(
                     new UndefinedFunction(
-                        'Function ' . $cased_function_id . ' does not exist',
+                        'Function ' . $cased_function_id . ' does not exist'
+                            .', consider enabling the allFunctionsGlobal config option if scanning legacy codebases',
                         $code_location,
                         $function_id,
                     ),

src/Psalm/Internal/Analyzer/Statements/Expression/Fetch/ConstFetchAnalyzer.php

@@ -106,7 +106,8 @@ public static function analyze(
                 } elseif ($context->check_consts) {
                     IssueBuffer::maybeAdd(
                         new UndefinedConstant(
-                            'Const ' . $const_name . ' is not defined',
+                            'Const ' . $const_name . ' is not defined'.
+                                ', consider enabling the allConstantsGlobal config option if scanning legacy codebases',
                             new CodeLocation($statements_analyzer->getSource(), $stmt),
                         ),
                         $statements_analyzer->getSuppressedIssues(),
@@ -151,10 +152,12 @@ public static function getGlobalConstType(
             || array_key_exists($const_name, $predefined_constants)
         ) {
             switch ($const_name) {
-                case 'PHP_VERSION':
                 case 'DIRECTORY_SEPARATOR':
                 case 'PATH_SEPARATOR':
                 case 'PHP_EOL':
+                    return Type::getSingleLetter();
+
+                case 'PHP_VERSION':
                     return Type::getNonEmptyString();
 
                 case 'PEAR_EXTENSION_DIR':

src/Psalm/Internal/Cli/Psalm.php

@@ -1284,6 +1284,8 @@ private static function configureProjectAnalyzer(
         if ($config->literal_array_key_check) {
             $project_analyzer->getCodebase()->literal_array_key_check = true;
         }
+        $project_analyzer->getCodebase()->all_constants_global = $config->all_constants_global;
+        $project_analyzer->getCodebase()->all_functions_global = $config->all_functions_global;
 
         if ($config->run_taint_analysis || $run_taint_analysis) {
             $project_analyzer->trackTaintedInputs();

src/Psalm/Internal/Codebase/Functions.php

@@ -153,13 +153,21 @@ public function addGlobalFunction(string $function_id, FunctionStorage $storage)
         self::$stubbed_functions[strtolower($function_id)] = $storage;
     }
 
+    /**
+     * @param array<lowercase-string, FunctionStorage> $stubs
+     */
+    public function addGlobalFunctions(array $stubs): void
+    {
+        self::$stubbed_functions += $stubs;
+    }
+
     public function hasStubbedFunction(string $function_id): bool
     {
         return isset(self::$stubbed_functions[strtolower($function_id)]);
     }
 
     /**
-     * @return array<string, FunctionStorage>
+     * @return array<lowercase-string, FunctionStorage>
      */
     public function getAllStubbedFunctions(): array
     {

src/Psalm/Internal/Codebase/Scanner.php

@@ -20,7 +20,9 @@
 use Psalm\Progress\Progress;
 use Psalm\Storage\ClassLikeStorage;
 use Psalm\Storage\FileStorage;
+use Psalm\Storage\FunctionStorage;
 use Psalm\Type;
+use Psalm\Type\Union;
 use ReflectionClass;
 use Throwable;
 use UnexpectedValueException;
@@ -78,7 +80,9 @@
  *     classlike_storage:array<string, ClassLikeStorage>,
  *     file_storage:array<lowercase-string, FileStorage>,
  *     new_file_content_hashes: array<string, string>,
- *     taint_data: ?TaintFlowGraph
+ *     taint_data: ?TaintFlowGraph,
+ *     global_constants: array<string, Union>,
+ *     global_functions: array<lowercase-string, FunctionStorage>
  * }
  */
 
@@ -352,6 +356,9 @@ private function scanFilePaths(int $pool_size): bool
                         $pool_data['new_file_content_hashes'],
                     );
                 }
+
+                $this->codebase->addGlobalConstantTypes($pool_data['global_constants']);
+                $this->codebase->functions->addGlobalFunctions($pool_data['global_functions']);
             }
         } else {
             foreach ($files_to_scan as $file_path => $_) {
@@ -364,27 +371,6 @@ private function scanFilePaths(int $pool_size): bool
             $this->codebase->statements_provider->parser_cache_provider->saveFileContentHashes();
         }
 
-        foreach ($files_to_scan as $scanned_file) {
-            if ($this->config->hasStubFile($scanned_file)) {
-                $file_storage = $this->file_storage_provider->get($scanned_file);
-
-                foreach ($file_storage->functions as $function_storage) {
-                    if ($function_storage->cased_name
-                        && !$this->codebase->functions->hasStubbedFunction($function_storage->cased_name)
-                    ) {
-                        $this->codebase->functions->addGlobalFunction(
-                            $function_storage->cased_name,
-                            $function_storage,
-                        );
-                    }
-                }
-
-                foreach ($file_storage->constants as $name => $type) {
-                    $this->codebase->addGlobalConstantType($name, $type);
-                }
-            }
-        }
-
         $this->file_reference_provider->addClassLikeFiles($this->classlike_files);
 
         return true;
@@ -519,7 +505,9 @@ private function scanFile(
                 $this->queueClassLikeForScanning($fq_classlike_name, false, false);
             }
 
-            if ($this->codebase->register_autoload_files) {
+            if ($this->codebase->register_autoload_files
+                || $this->codebase->all_functions_global
+            ) {
                 foreach ($file_storage->functions as $function_storage) {
                     if ($function_storage->cased_name
                         && !$this->codebase->functions->hasStubbedFunction($function_storage->cased_name)
@@ -530,7 +518,10 @@ private function scanFile(
                         );
                     }
                 }
-
+            }
+            if ($this->codebase->register_autoload_files
+                || $this->codebase->all_constants_global
+            ) {
                 foreach ($file_storage->constants as $name => $type) {
                     $this->codebase->addGlobalConstantType($name, $type);
                 }

src/Psalm/Internal/Fork/ShutdownScannerTask.php

@@ -47,6 +47,8 @@ public function run(Channel $channel, Cancellation $cancellation): mixed
                 ? $statements_provider->parser_cache_provider->getNewFileContentHashes()
                 : [],
             'taint_data' => $codebase->taint_flow_graph,
+            'global_constants' => $codebase->getAllStubbedConstants(),
+            'global_functions' => $codebase->functions->getAllStubbedFunctions(),
         ];
     }
 }

src/Psalm/Internal/PhpVisitor/Reflector/ExpressionScanner.php

@@ -188,8 +188,10 @@ private static function registerClassMapFunctionCall(
                         $file_storage->declaring_constants[$const_name] = $file_storage->file_path;
                     }
 
-                    if (($codebase->register_stub_files || $codebase->register_autoload_files)
-                        && (!defined($const_name) || $const_type->isMixed())
+                    if (($codebase->register_stub_files
+                        || $codebase->register_autoload_files
+                        || $codebase->all_constants_global
+                        ) && (!defined($const_name) || !$const_type->isMixed())
                     ) {
                         $codebase->addGlobalConstantType($const_name, $const_type);
                     }

src/Psalm/Internal/PhpVisitor/Reflector/FunctionLikeNodeScanner.php

@@ -489,7 +489,8 @@ public function start(
             && $function_id
             && $storage instanceof FunctionStorage
         ) {
-            if ($this->codebase->register_stub_files
+            if ($this->codebase->all_functions_global
+                || $this->codebase->register_stub_files
                 || ($this->codebase->register_autoload_files
                     && !$this->codebase->functions->hasStubbedFunction($function_id))
             ) {
@@ -914,7 +915,10 @@ private function createStorageForFunctionLike(
 
             $storage = $this->storage = new FunctionStorage();
 
-            if ($this->codebase->register_stub_files || $this->codebase->register_autoload_files) {
+            if ($this->codebase->register_stub_files
+                || $this->codebase->register_autoload_files
+                || $this->codebase->all_functions_global
+            ) {
                 if (isset($this->file_storage->functions[$function_id])
                     && ($this->codebase->register_stub_files
                         || !$this->codebase->functions->hasStubbedFunction($function_id))

src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php

@@ -38,6 +38,7 @@
 use UnexpectedValueException;
 
 use function array_pop;
+use function defined;
 use function end;
 use function explode;
 use function in_array;
@@ -288,7 +289,11 @@ public function enterNode(PhpParser\Node $node): ?int
 
                 $fq_const_name = Type::getFQCLNFromString($const->name->name, $this->aliases);
 
-                if ($this->codebase->register_stub_files || $this->codebase->register_autoload_files) {
+                if (($this->codebase->register_stub_files
+                    || $this->codebase->register_autoload_files
+                    || $this->codebase->all_constants_global
+                    ) && (!defined($fq_const_name) || !$const_type->isMixed())
+                ) {
                     $this->codebase->addGlobalConstantType($fq_const_name, $const_type);
                 }