Fix compilation with macOS mmap/malloc workaround. Add Python (macOS) to CI.

.github/workflows/build-majestic.yml

@@ -160,3 +160,30 @@ jobs:
       working-directory: ./src/runtime/haskell
       run: |
         cabal test --extra-lib-dirs=/usr/local/lib
+
+  macos-python:
+    name: Python (macOS)
+    runs-on: macOS-11
+    needs: macos-runtime
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Download artifact
+      uses: actions/download-artifact@master
+      with:
+        name: libpgf-macos
+    - run: |
+        sudo mv lib/* /usr/local/lib/
+        sudo mv include/* /usr/local/include/
+
+    - name: Install bindings
+      working-directory: ./src/runtime/python
+      run: |
+        python3 setup.py build
+        sudo python3 setup.py install
+
+    - name: Run testsuite
+      working-directory: ./src/runtime/python
+      run: |
+        pip3 install pytest
+        pytest

src/runtime/c/pgf/db.cxx

@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
 #include <unistd.h>
@@ -325,10 +326,10 @@ PgfDB::PgfDB(const char* filepath, int flags, int mode) {
 
 #ifndef MREMAP_MAYMOVE
     if (fd >= 0) {
-      ms = (malloc_state*)
-          mmap(NULL, file_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+        ms = (malloc_state*)
+            mmap(NULL, file_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
     } else {
-      ms = (malloc_state*) malloc(file_size); // doesn't compile
+        ms = (malloc_state*) ::malloc(file_size);
     }
 #else
     int mflags = (fd < 0) ? (MAP_PRIVATE | MAP_ANONYMOUS) : MAP_SHARED;
@@ -377,6 +378,11 @@ PgfDB::~PgfDB() {
         size_t size =
             ms->top + chunksize(ptr(ms,ms->top)) + sizeof(size_t);
 
+#ifndef MREMAP_MAYMOVE
+        if (fd < 0) {
+          ::free(ms);
+        } else
+#endif
         munmap(ms,size);
     }
 
@@ -897,12 +903,12 @@ object PgfDB::malloc_internal(size_t bytes)
 // OSX mman and mman-win32 do not implement mremap or MREMAP_MAYMOVE
 #ifndef MREMAP_MAYMOVE
             if (fd >= 0) {
-              if (munmap(ms, old_size) == -1)
-                  throw pgf_systemerror(errno);
-              new_ms =
-                  (malloc_state*) mmap(0, new_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+                if (munmap(ms, old_size) == -1)
+                    throw pgf_systemerror(errno);
+                new_ms =
+                    (malloc_state*) mmap(0, new_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
             } else {
-              new_ms = (malloc_state*) realloc(ms, new_size);
+                new_ms = (malloc_state*) realloc(ms, new_size);
             }
 #else
             new_ms =