Make the `heap_allocator` just be the `permanent_allocator`

This improves the speed of the compiler with very little memory increase (which surprised me, Ginger Bill)

src/build_settings.cpp

@@ -1411,7 +1411,6 @@ gb_internal bool init_build_paths(String init_filename) {
 		if ((bc->command_kind & Command__does_build) && (!bc->ignore_microsoft_magic)) {
 			// NOTE(ic): It would be nice to extend this so that we could specify the Visual Studio version that we want instead of defaulting to the latest.
 			Find_Result find_result = find_visual_studio_and_windows_sdk();
-			defer (mc_free_all());
 
 			if (find_result.windows_sdk_version == 0) {
 				gb_printf_err("Windows SDK not found.\n");

src/common_memory.cpp

@@ -306,10 +306,11 @@ gb_internal gbAllocator temporary_allocator() {
 gb_internal GB_ALLOCATOR_PROC(heap_allocator_proc);
 
 gb_internal gbAllocator heap_allocator(void) {
-	gbAllocator a;
-	a.proc = heap_allocator_proc;
-	a.data = nullptr;
-	return a;
+	return arena_allocator(&permanent_arena);
+	// gbAllocator a;
+	// a.proc = heap_allocator_proc;
+	// a.data = nullptr;
+	// return a;
 }
 
 

src/main.cpp

@@ -1716,6 +1716,16 @@ gb_internal void show_timings(Checker *c, Timings *t) {
 
 	timings_print_all(t);
 
+	if (build_context.show_more_timings) {
+	#if defined(GB_SYSTEM_WINDOWS)
+		PROCESS_MEMORY_COUNTERS p = {sizeof(p)};
+		if (GetProcessMemoryInfo(GetCurrentProcess(), &p, sizeof(p))) {
+			gb_printf("\n");
+			gb_printf("Peak Memory Size: %.3f MiB\n", (cast(f64)p.PeakWorkingSetSize) / cast(f64)(1024ull * 1024ull));
+		}
+	#endif
+	}
+
 	if (!(build_context.export_timings_format == TimingsExportUnspecified)) {
 		timings_export_all(t, c, true);
 	}
@@ -2481,14 +2491,13 @@ int main(int arg_count, char const **arg_ptr) {
 		usage(make_string_c(arg_ptr[0]));
 		return 1;
 	}
+	virtual_memory_init();
 
 	timings_init(&global_timings, str_lit("Total Time"), 2048);
 	defer (timings_destroy(&global_timings));
 
 	MAIN_TIME_SECTION("initialization");
 
-	virtual_memory_init();
-
 	init_string_interner();
 	init_global_error_collector();
 	init_keyword_hash_table();

src/microsoft_craziness.h

@@ -45,7 +45,7 @@
 //
 // Here is the API you need to know about:
 //
-gb_global gbAllocator mc_allocator = heap_allocator();
+gb_global gbAllocator mc_allocator = permanent_allocator();
 
 struct Find_Result {
 	int windows_sdk_version;   // Zero if no Windows SDK found.
@@ -91,10 +91,6 @@ gb_internal void mc_free(String16 str) {
 	if (str.len) gb_free(mc_allocator, str.text);
 }
 
-gb_internal void mc_free_all() {
-	gb_free_all(mc_allocator);
-}
-
 typedef struct _MC_Find_Data {
 	DWORD  file_attributes;
 	String filename;