[clang] [clang][Tooling] Add special symbol mappings for C, starting with size_t (PR #85784)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: kadir çetinkaya (kadircet)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/85784.diff


3 Files Affected:

- (added) clang/lib/Tooling/Inclusions/Stdlib/CSpecialSymbolMap.inc (+8) 
- (modified) clang/lib/Tooling/Inclusions/Stdlib/StandardLibrary.cpp (+2-1) 
- (modified) clang/unittests/Tooling/StandardLibraryTest.cpp (+12) 


``````````diff
diff --git a/clang/lib/Tooling/Inclusions/Stdlib/CSpecialSymbolMap.inc b/clang/lib/Tooling/Inclusions/Stdlib/CSpecialSymbolMap.inc
new file mode 100644
index 00000000000000..1d9c294d207970
--- /dev/null
+++ b/clang/lib/Tooling/Inclusions/Stdlib/CSpecialSymbolMap.inc
@@ -0,0 +1,8 @@
+//===-- StdSpecialSymbolMap.inc -----------------------------------*- C -*-===//
+//
+// This is a hand-curated list for C symbols that cannot be parsed/extracted
+// via the include-mapping tool (gen_std.py).
+//
+//===----------------------------------------------------------------------===//
+
+SYMBOL(size_t, None, <stddef.h>)
diff --git a/clang/lib/Tooling/Inclusions/Stdlib/StandardLibrary.cpp b/clang/lib/Tooling/Inclusions/Stdlib/StandardLibrary.cpp
index adf1b230ff0318..386094fc2992e1 100644
--- a/clang/lib/Tooling/Inclusions/Stdlib/StandardLibrary.cpp
+++ b/clang/lib/Tooling/Inclusions/Stdlib/StandardLibrary.cpp
@@ -55,11 +55,12 @@ static const SymbolHeaderMapping *getMappingPerLang(Lang L) {
 }
 
 static int countSymbols(Lang Language) {
-  ArrayRef<const char*> Symbols;
+  ArrayRef<const char *> Symbols;
 #define SYMBOL(Name, NS, Header) #NS #Name,
   switch (Language) {
   case Lang::C: {
     static constexpr const char *CSymbols[] = {
+#include "CSpecialSymbolMap.inc"
 #include "CSymbolMap.inc"
     };
     Symbols = CSymbols;
diff --git a/clang/unittests/Tooling/StandardLibraryTest.cpp b/clang/unittests/Tooling/StandardLibraryTest.cpp
index edca31649accfa..d93b7d1af82d37 100644
--- a/clang/unittests/Tooling/StandardLibraryTest.cpp
+++ b/clang/unittests/Tooling/StandardLibraryTest.cpp
@@ -185,6 +185,18 @@ TEST(StdlibTest, RecognizerForC99) {
             stdlib::Symbol::named("", "uint8_t", stdlib::Lang::C));
 }
 
+TEST(StdlibTest, SpecialCMappings) {
+  TestInputs Input("typedef char size_t;");
+  Input.Language = TestLanguage::Lang_C99;
+  TestAST AST(Input);
+
+  auto &SizeT = lookup(AST, "size_t");
+  stdlib::Recognizer Recognizer;
+  auto ActualSym = Recognizer(&SizeT);
+  EXPECT_EQ(ActualSym, stdlib::Symbol::named("", "size_t", stdlib::Lang::C));
+  EXPECT_EQ(ActualSym->header()->name(), "<stddef.h>");
+}
+
 } // namespace
 } // namespace tooling
 } // namespace clang

``````````

</details>


https://github.com/llvm/llvm-project/pull/85784