From 8eb134dbbd44002f3acd90d91550875f161136fa Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Fri, 13 Dec 2019 12:09:32 +1100
Subject: Backport: Implement DynamicLibrary on Cocoa.

Backport of changeset 7865:a5c2f8a3f171.
---
 cocoa/PlatCocoa.mm | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

(limited to 'cocoa')

diff --git a/cocoa/PlatCocoa.mm b/cocoa/PlatCocoa.mm
index 52e5399a9..8f49d5eed 100644
--- a/cocoa/PlatCocoa.mm
+++ b/cocoa/PlatCocoa.mm
@@ -24,6 +24,7 @@
 #include <map>
 #include <memory>
 
+#include <dlfcn.h>
 #include <sys/time.h>
 
 #import <Foundation/NSGeometry.h>
@@ -2096,6 +2097,43 @@ void Platform::Assert(const char *c, const char *file, int line)
 
 //----------------- DynamicLibrary -----------------------------------------------------------------
 
+/**
+ * Platform-specific module loading and access.
+ * Uses POSIX calls dlopen, dlsym, dlclose.
+ */
+
+class DynamicLibraryImpl : public DynamicLibrary {
+protected:
+	void *m;
+public:
+	explicit DynamicLibraryImpl(const char *modulePath) noexcept {
+		m = dlopen(modulePath, RTLD_LAZY);
+	}
+	// Deleted so DynamicLibraryImpl objects can not be copied.
+	DynamicLibraryImpl(const DynamicLibraryImpl&) = delete;
+	DynamicLibraryImpl(DynamicLibraryImpl&&) = delete;
+	DynamicLibraryImpl&operator=(const DynamicLibraryImpl&) = delete;
+	DynamicLibraryImpl&operator=(DynamicLibraryImpl&&) = delete;
+
+	~DynamicLibraryImpl() override {
+		if (m)
+			dlclose(m);
+	}
+
+	// Use dlsym to get a pointer to the relevant function.
+	Function FindFunction(const char *name) override {
+		if (m) {
+			return dlsym(m, name);
+		} else {
+			return nullptr;
+		}
+	}
+
+	bool IsValid() override {
+		return m != nullptr;
+	}
+};
+
 /**
  * Implements the platform specific part of library loading.
  *
@@ -2104,8 +2142,7 @@ void Platform::Assert(const char *c, const char *file, int line)
  */
 DynamicLibrary* DynamicLibrary::Load(const char* /* modulePath */)
 {
-  // Not implemented.
-  return nullptr;
+  return static_cast<DynamicLibrary *>(new DynamicLibraryImpl(modulePath));
 }
 
 //--------------------------------------------------------------------------------------------------
-- 
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