Add support for macOS (#771)

* use shm_open() instead of memfd_create() on macOS

malloc.h isn't a header on macOS

* Change OpenGL headers + create ifdef for DO_PROCLIST

macOS seems to already have the OpenGL functions defined, without the ifdef, it gives "ambiguous references" errors.

* macOS doesn't have ->gregs in uc_mcontext

and it doesn't have REG_RIP either
https://github.com/gperftools/gperftools/blob/master/m4/pc_from_ucontext.m4

* use getpid() to make memory file name unique

* #ifndef __APPLE__ for AF_PACKET and linux/if_packet.h

* Add include and link directories for macOS and link the OpenGL framework

* Add macOS CI

* Use newly added libslirp package from Homebrew

https://github.com/Homebrew/homebrew-core/pull/63412

* Use Apple's Clang instead of GNU GCC on macOS

* Add macOS build instructions to README

* Try to fix macOS undefined symbol

* snprintf doesn't take null terminator into account

* Map new memory on macOS for JIT

* Only use gcc-ar if using GNU Compiler

* re-add fastmem code - whoops!

* Fix style issue - use camelCase not snake_case

* Set Minimum macOS version

* Switch Minimum OS X version to 10.9

* Add macOS libpcap library name

* fix memory leak

* Fix binding keys in macOS

* Allow getting MAC address on macOS

melonDS on Linux uses AF_PACKET, which doesn't exist on macOS. Instead, this commit uses AF_LINK on macOS to get the MAC address.

* Remove unneeded macOS CI dependencies

* Build melonDS app bundle on macOS

Now it is no longer required to install the libraries on macOS, they come with the app bundle.

* fix macOS CI not being able to find macdeployqt

* copy melonDS.app with recursive because it's a folder

* Disable fastmem checkbox on macOS

* Disable fastmem by default in config

* forgot a semicolon

* Don't bundle libraries, causes issues on macOS <10.15

* Update README + allow finding version in Finder on macOS

* Make sure fastmem checkbox stays uncheckable

10 files changed, 105 insertions, 12 deletions

diff --git a/src/ARMJIT_Memory.cpp b/src/ARMJIT_Memory.cpp
index 70d18e6..cc0f149 100644
--- a/src/ARMJIT_Memory.cpp
+++ b/src/ARMJIT_Memory.cpp
@@ -22,7 +22,9 @@
 #include "NDSCart.h"
 #include "SPU.h"
 
+#ifndef __APPLE__
 #include <malloc.h>
+#endif
 
 /*
     We're handling fastmem here.
@@ -152,7 +154,12 @@ static void SigsegvHandler(int sig, siginfo_t* info, void* rawContext)
     u8* curArea = (u8*)(NDS::CurCPU == 0 ? ARMJIT_Memory::FastMem9Start : ARMJIT_Memory::FastMem7Start);
 #ifdef __x86_64__
     desc.EmulatedFaultAddr = (u8*)info->si_addr - curArea;
-    desc.FaultPC = (u8*)context->uc_mcontext.gregs[REG_RIP];
+    #ifdef __APPLE__
+        desc.FaultPC = (u8*)context->uc_mcontext->__ss.__rip;
+    #else
+        desc.FaultPC = (u8*)context->uc_mcontext.gregs[REG_RIP];
+    #endif
+   
 #else
     desc.EmulatedFaultAddr = (u8*)context->uc_mcontext.fault_address - curArea;
     desc.FaultPC = (u8*)context->uc_mcontext.pc;
@@ -161,7 +168,11 @@ static void SigsegvHandler(int sig, siginfo_t* info, void* rawContext)
     if (ARMJIT_Memory::FaultHandler(desc))
     {
 #ifdef __x86_64__
-        context->uc_mcontext.gregs[REG_RIP] = (u64)desc.FaultPC;
+        #ifdef __APPLE__
+            context->uc_mcontext->__ss.__rip = (u64)desc.FaultPC;
+        #else
+            context->uc_mcontext.gregs[REG_RIP] = (u64)desc.FaultPC;
+        #endif
 #else
         context->uc_mcontext.pc = (u64)desc.FaultPC;
 #endif
@@ -701,7 +712,14 @@ void Init()
     FastMem7Start = MemoryBase + AddrSpaceSize;
     MemoryBase = MemoryBase + AddrSpaceSize*2;
 
-    MemoryFile = memfd_create("melondsfastmem", 0);
+    #ifdef __APPLE__
+        char* fastmemPidName = new char[snprintf(NULL, 0, "melondsfastmem%d", getpid()) + 1];
+        sprintf(fastmemPidName, "melondsfastmem%d", getpid());
+        MemoryFile = shm_open(fastmemPidName, O_RDWR|O_CREAT, 0600);
+        delete[] fastmemPidName;
+    #else    
+        MemoryFile = memfd_create("melondsfastmem", 0);
+    #endif
     ftruncate(MemoryFile, MemoryTotalSize);
 
     struct sigaction sa;
@@ -736,6 +754,11 @@ void DeInit()
     svcUnmapProcessCodeMemory(envGetOwnProcessHandle(), (u64)MemoryBaseCodeMem, (u64)MemoryBase, MemoryTotalSize);
     virtmemFree(MemoryBaseCodeMem, MemoryTotalSize);
     free(MemoryBase);
+#elif defined(__APPLE__)
+    char* fastmemPidName = new char[snprintf(NULL, 0, "melondsfastmem%d", getpid()) + 1];
+    sprintf(fastmemPidName, "melondsfastmem%d", getpid());
+    shm_unlink(fastmemPidName);
+    delete[] fastmemPidName;
 #elif defined(_WIN32)
     assert(UnmapViewOfFile(MemoryBase));
     CloseHandle(MemoryFile);
@@ -1259,4 +1282,4 @@ void* GetFuncForAddr(ARM* cpu, u32 addr, bool store, int size)
     return NULL;
 }
 
-}
\ No newline at end of file
+}
diff --git a/src/ARMJIT_x64/ARMJIT_Compiler.cpp b/src/ARMJIT_x64/ARMJIT_Compiler.cpp
index 076f48c..cc4ad80 100644
--- a/src/ARMJIT_x64/ARMJIT_Compiler.cpp
+++ b/src/ARMJIT_x64/ARMJIT_Compiler.cpp
@@ -221,6 +221,8 @@ Compiler::Compiler()
     #ifdef _WIN32
         DWORD dummy;
         VirtualProtect(pageAligned, alignedSize, PAGE_EXECUTE_READWRITE, &dummy);
+    #elif defined(__APPLE__)
+        pageAligned = (u8*)mmap(NULL, 1024*1024*32, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS ,-1, 0);
     #else
         mprotect(pageAligned, alignedSize, PROT_EXEC | PROT_READ | PROT_WRITE);
     #endif
diff --git a/src/ARMJIT_x64/ARMJIT_Linkage.s b/src/ARMJIT_x64/ARMJIT_Linkage.s
index 0a84df0..8cc0b5f 100644
--- a/src/ARMJIT_x64/ARMJIT_Linkage.s
+++ b/src/ARMJIT_x64/ARMJIT_Linkage.s
@@ -29,8 +29,13 @@
 
 .p2align 4,,15
 
+#ifdef __APPLE__
+.global _ARM_Dispatch
+_ARM_Dispatch:
+#else
 .global ARM_Dispatch
 ARM_Dispatch:
+#endif
 #ifdef WIN64
     push rdi
     push rsi
@@ -54,8 +59,13 @@ ARM_Dispatch:
 
 .p2align 4,,15
 
+#ifdef __APPLE__
+.global _ARM_Ret
+_ARM_Ret:
+#else
 .global ARM_Ret
 ARM_Ret:
+#endif
     mov [RCPU + ARM_CPSR_offset], RCPSR
 
 #ifdef WIN64
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d6c3897..446480d 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -100,10 +100,17 @@ if (ENABLE_JIT)
 	endif()
 endif()
 
+if (APPLE)
+        target_include_directories(core PUBLIC /usr/local/include)
+        target_link_directories(core PUBLIC /usr/local/lib)
+endif()
+
 if (ENABLE_OGLRENDERER)
 	if (WIN32)
 		target_link_libraries(core ole32 comctl32 ws2_32 opengl32)
-	else()
+  elseif (APPLE)
+    target_link_libraries(core "-framework OpenGL")
+  else()
 		target_link_libraries(core GL EGL)
 	endif()
 else()
diff --git a/src/Config.cpp b/src/Config.cpp
index 341b14c..f7db252 100644
--- a/src/Config.cpp
+++ b/src/Config.cpp
@@ -73,7 +73,11 @@ ConfigEntry ConfigFile[] =
     {"JIT_MaxBlockSize", 0, &JIT_MaxBlockSize, 32, NULL, 0},
     {"JIT_BranchOptimisations", 0, &JIT_BranchOptimisations, 1, NULL, 0},
     {"JIT_LiteralOptimisations", 0, &JIT_LiteralOptimisations, 1, NULL, 0},
-    {"JIT_FastMemory", 0, &JIT_FastMemory, 1, NULL, 0},
+    #ifdef __APPLE__
+        {"JIT_FastMemory", 0, &JIT_FastMemory, 0, NULL, 0},
+    #else
+        {"JIT_FastMemory", 0, &JIT_FastMemory, 1, NULL, 0},
+    #endif
 #endif
 
     {"", -1, NULL, 0, NULL, 0}
diff --git a/src/OpenGLSupport.h b/src/OpenGLSupport.h
index 925c0ad..44c511f 100644
--- a/src/OpenGLSupport.h
+++ b/src/OpenGLSupport.h
@@ -23,8 +23,13 @@
 #include <string.h>
 
 // TODO: different includes for each platform
-#include <GL/gl.h>
-#include <GL/glext.h>
+#ifdef __APPLE__
+    #include <OpenGL/gl3.h>
+    #include <OpenGL/gl3ext.h>
+#else
+    #include <GL/gl.h>
+    #include <GL/glext.h>
+#endif
 
 #include "Platform.h"
 
@@ -61,6 +66,11 @@
 
 #endif
 
+#ifdef __APPLE__
+
+#define DO_PROCLIST(func)
+
+#else
 
 #define DO_PROCLIST(func) \
     DO_PROCLIST_1_3(func) \
@@ -128,6 +138,7 @@
      \
     func(GLGETSTRINGI, glGetStringi); \
 
+#endif
 
 namespace OpenGL
 {
diff --git a/src/frontend/qt_sdl/CMakeLists.txt b/src/frontend/qt_sdl/CMakeLists.txt
index 9a0a025..0d695d6 100644
--- a/src/frontend/qt_sdl/CMakeLists.txt
+++ b/src/frontend/qt_sdl/CMakeLists.txt
@@ -95,6 +95,19 @@ if (PORTABLE)
     add_definitions(-DPORTABLE)
 endif()
 
+if (APPLE)
+    set_target_properties(melonDS PROPERTIES
+                         MACOSX_BUNDLE true
+                         MACOSX_BUNDLE_INFO_PLIST ${CMAKE_SOURCE_DIR}/melonDS.plist
+                         OUTPUT_NAME melonDS
+                         )
+
+    # Copy icon into the bundle
+    target_sources(melonDS PRIVATE "${CMAKE_SOURCE_DIR}/melonDS.icns")
+    set_source_files_properties("${CMAKE_SOURCE_DIR}/melonDS.icns" PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
+
+endif()
+
 install(FILES ../../../net.kuribo64.melonDS.desktop DESTINATION ${CMAKE_INSTALL_PREFIX}/share/applications)
 install(FILES ../../../icon/melon_16x16.png DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/16x16/apps RENAME net.kuribo64.melonDS.png)
 install(FILES ../../../icon/melon_32x32.png DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/32x32/apps RENAME net.kuribo64.melonDS.png)
@@ -102,4 +115,4 @@ install(FILES ../../../icon/melon_48x48.png DESTINATION ${CMAKE_INSTALL_PREFIX}/
 install(FILES ../../../icon/melon_64x64.png DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/64x64/apps RENAME net.kuribo64.melonDS.png)
 install(FILES ../../../icon/melon_128x128.png DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/128x128/apps RENAME net.kuribo64.melonDS.png)
 install(FILES ../../../icon/melon_256x256.png DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons/hicolor/256x256/apps RENAME net.kuribo64.melonDS.png)
-install(TARGETS melonDS RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
+install(TARGETS melonDS BUNDLE DESTINATION ${CMAKE_BINARY_DIR} RUNTIME DESTINATION ${CMAKE_INSTALL_PREFIX}/bin)
diff --git a/src/frontend/qt_sdl/EmuSettingsDialog.cpp b/src/frontend/qt_sdl/EmuSettingsDialog.cpp
index 79ce5ed..3183182 100644
--- a/src/frontend/qt_sdl/EmuSettingsDialog.cpp
+++ b/src/frontend/qt_sdl/EmuSettingsDialog.cpp
@@ -65,6 +65,9 @@ EmuSettingsDialog::EmuSettingsDialog(QWidget* parent) : QDialog(parent), ui(new
     ui->chkJITBranchOptimisations->setChecked(Config::JIT_BranchOptimisations != 0);
     ui->chkJITLiteralOptimisations->setChecked(Config::JIT_LiteralOptimisations != 0);
     ui->chkJITFastMemory->setChecked(Config::JIT_FastMemory != 0);
+    #ifdef __APPLE__
+        ui->chkJITFastMemory->setDisabled(true);
+    #endif
     ui->spnJITMaximumBlockSize->setValue(Config::JIT_MaxBlockSize);
 #else
     ui->chkEnableJIT->setDisabled(true);
@@ -329,6 +332,8 @@ void EmuSettingsDialog::on_chkEnableJIT_toggled()
     bool disabled = !ui->chkEnableJIT->isChecked();
     ui->chkJITBranchOptimisations->setDisabled(disabled);
     ui->chkJITLiteralOptimisations->setDisabled(disabled);
-    ui->chkJITFastMemory->setDisabled(disabled);
+    #ifndef __APPLE__
+        ui->chkJITFastMemory->setDisabled(disabled);
+    #endif
     ui->spnJITMaximumBlockSize->setDisabled(disabled);
 }
diff --git a/src/frontend/qt_sdl/InputConfigDialog.cpp b/src/frontend/qt_sdl/InputConfigDialog.cpp
index 9f08731..eaf1e9b 100644
--- a/src/frontend/qt_sdl/InputConfigDialog.cpp
+++ b/src/frontend/qt_sdl/InputConfigDialog.cpp
@@ -216,6 +216,7 @@ KeyMapButton::KeyMapButton(int* mapping, bool hotkey) : QPushButton()
 
     setCheckable(true);
     setText(mappingText());
+    setFocusPolicy(Qt::StrongFocus); //Fixes binding keys in macOS
 
     connect(this, &KeyMapButton::clicked, this, &KeyMapButton::onClick);
 }
diff --git a/src/frontend/qt_sdl/LAN_PCap.cpp b/src/frontend/qt_sdl/LAN_PCap.cpp
index ce278bc..8138699 100644
--- a/src/frontend/qt_sdl/LAN_PCap.cpp
+++ b/src/frontend/qt_sdl/LAN_PCap.cpp
@@ -33,7 +33,11 @@
 	#include <sys/types.h>
 	#include <ifaddrs.h>
 	#include <netinet/in.h>
-	#include <linux/if_packet.h>
+        #ifdef __APPLE__
+            #include <net/if_dl.h>
+        #else
+	    #include <linux/if_packet.h>
+        #endif
 #endif
 
 
@@ -66,6 +70,9 @@ const char* PCapLibNames[] =
 #ifdef __WIN32__
     // TODO: name for npcap in non-WinPCap mode
     "wpcap.dll",
+#elif defined(__APPLE__)
+    "libpcap.A.dylib",
+    "libpcap.dylib",
 #else
     // Linux lib names
     "libpcap.so.1",
@@ -276,6 +283,16 @@ bool Init(bool open_adapter)
                 struct sockaddr_in* sa = (sockaddr_in*)curaddr->ifa_addr;
                 memcpy(adata->IP_v4, &sa->sin_addr, 4);
             }
+            #ifdef __APPLE__
+            else if (af == AF_LINK)
+            {
+                struct sockaddr_dl* sa = (sockaddr_dl*)curaddr->ifa_addr;
+                if (sa->sdl_alen != 6)
+                    printf("weird MAC length %d for %s\n", sa->sdl_alen, curaddr->ifa_name);
+                else
+                    memcpy(adata->MAC, LLADDR(sa), 6);
+            }
+            #else
             else if (af == AF_PACKET)
             {
                 struct sockaddr_ll* sa = (sockaddr_ll*)curaddr->ifa_addr;
@@ -284,7 +301,7 @@ bool Init(bool open_adapter)
                 else
                     memcpy(adata->MAC, sa->sll_addr, 6);
             }
-
+            #endif
             curaddr = curaddr->ifa_next;
         }
     }