[libc-commits] [libc] [libc] Add dlinfo + RTLD_DI_* macros to dlfcn.h (PR #149938)

[via libc-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: Caslyn Tonelli (Caslyn)

<details>
<summary>Changes</summary>

An initial commit for #<!-- -->149911, this adds a stub implementation for dlinfo and the enums list of `RTLD_DI_*` values.

---
Full diff: https://github.com/llvm/llvm-project/pull/149938.diff


4 Files Affected:

- (modified) libc/include/dlfcn.yaml (+31) 
- (modified) libc/src/dlfcn/CMakeLists.txt (+11) 
- (added) libc/src/dlfcn/dlinfo.cpp (+22) 
- (added) libc/src/dlfcn/dlinfo.h (+20) 


``````````diff
diff --git a/libc/include/dlfcn.yaml b/libc/include/dlfcn.yaml
index 28be34dbd95bd..275279afb48d2 100644
--- a/libc/include/dlfcn.yaml
+++ b/libc/include/dlfcn.yaml
@@ -29,6 +29,29 @@ macros:
     standards:
       - gnu
     macro_value: "0x01000"
+enums:
+  - name: RTLD_DI_LMID
+    value: 1
+  - name: RTLD_DI_LINKMAP
+    value: 2
+  - name: RTLD_DI_CONFIGADDR,
+    value: 3
+  - name: RTLD_DI_SERINFO
+    value: 4
+  - name: RTLD_DI_SERINFOSIZE
+    value: 5
+  - name: RTLD_DI_ORIGIN
+    value: 6
+  - name: RTLD_DI_PROFILENAME
+    value: 7
+  - name: RTLD_DI_PROFILEOUT
+    value: 8
+  - name: RTLD_DI_TLSMODID
+    value: 9
+  - name: RTLD_DI_TLS_DATA
+    value: 10
+  - name: RTLD_DI_PHDR
+    value: 11
 functions:
   - name: dlclose
     standards:
@@ -55,3 +78,11 @@ functions:
     arguments:
       - type: void *__restrict
       - type: const char *__restrict
+  - name: dlinfo
+    standards:
+      - GNUExtensions
+    return_type: int
+    arguments:
+      - type: void *__restrict
+      - type: int
+      - type: void *__restrict
diff --git a/libc/src/dlfcn/CMakeLists.txt b/libc/src/dlfcn/CMakeLists.txt
index e3a51ba65764d..1ee05fc380c94 100644
--- a/libc/src/dlfcn/CMakeLists.txt
+++ b/libc/src/dlfcn/CMakeLists.txt
@@ -38,3 +38,14 @@ add_entrypoint_object(
     libc.include.dlfcn
     libc.src.errno.errno
 )
+
+add_entrypoint_object(
+  dlinfo
+  SRCS
+    dlinfo.cpp
+  HDRS
+    dlinfo.h
+  DEPENDS
+    libc.include.dlfcn
+    libc.src.errno.errno
+)
diff --git a/libc/src/dlfcn/dlinfo.cpp b/libc/src/dlfcn/dlinfo.cpp
new file mode 100644
index 0000000000000..7dae9592a9d90
--- /dev/null
+++ b/libc/src/dlfcn/dlinfo.cpp
@@ -0,0 +1,22 @@
+
+//===-- Implementation of dlinfo ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "dlinfo.h"
+
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+// TODO: https://github.com/llvm/llvm-project/issues/149911
+LLVM_LIBC_FUNCTION(int, dlinfo, (void *restrict, int, void *restrict)) {
+  return -1;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/dlfcn/dlinfo.h b/libc/src/dlfcn/dlinfo.h
new file mode 100644
index 0000000000000..c2c34f02bd6f1
--- /dev/null
+++ b/libc/src/dlfcn/dlinfo.h
@@ -0,0 +1,20 @@
+//===-- Implementation header of dlinfo -------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_DLFCN_DLINFO_H
+#define LLVM_LIBC_SRC_DLFCN_DLINFO_H
+
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int dlinfo(void *restrict, int, void *restrict);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_DLFCN_DLINFO_H

``````````

</details>


https://github.com/llvm/llvm-project/pull/149938