From c6a7ce47c48ae7a59263c877cb0d7cc3e8c5243d Mon Sep 17 00:00:00 2001
From: Smiril <Smiril@users.noreply.github.com>
Date: Sat, 11 May 2024 21:38:20 +0200
Subject: [PATCH] Create SysMacOSDbg.cpp

---
 source/lib/Sys/src/SysMacOSDbg.cpp | 152 +++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 source/lib/Sys/src/SysMacOSDbg.cpp

diff --git a/source/lib/Sys/src/SysMacOSDbg.cpp b/source/lib/Sys/src/SysMacOSDbg.cpp
new file mode 100644
index 0000000..b44f5a5
--- /dev/null
+++ b/source/lib/Sys/src/SysMacOSDbg.cpp
@@ -0,0 +1,152 @@
+#include "Kyty/Core/Common.h"
+
+#if KYTY_PLATFORM != KYTY_PLATFORM_MACOS
+//#error "KYTY_PLATFORM != KYTY_PLATFORM_MACOS"
+#else
+
+#include "Kyty/Sys/SysDbg.h"
+
+#include <cstdlib>
+#include <cstring>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+namespace Kyty {
+
+static thread_local sys_dbg_stack_info_t g_stack = {0};
+
+void sys_stack_walk(void** /*stack*/, int* depth)
+{
+	*depth = 0;
+}
+
+void sys_stack_usage_print(sys_dbg_stack_info_t& stack)
+{
+	printf("stack: (0x%" PRIx64 ", %" PRIu64 ")\n", static_cast<uint64_t>(stack.commited_addr), static_cast<uint64_t>(stack.commited_size));
+	printf("code: (0x%" PRIx64 ", %" PRIu64 ")\n", static_cast<uint64_t>(stack.code_addr), static_cast<uint64_t>(stack.code_size));
+}
+
+void sys_stack_usage(sys_dbg_stack_info_t& s)
+{
+	pid_t pid = getpid();
+
+	// printf("pid = %"I64"d\n", (int64_t)pid);
+
+	[[maybe_unused]] int result = 0;
+
+	char str[1024];
+	char str2[1024];
+	result = sprintf(str, "/proc/%d/exe", static_cast<int>(pid));
+
+	ssize_t buff_len = 0;
+	if ((buff_len = readlink(str, str2, 1023)) == -1)
+	{
+		return;
+	}
+	str2[buff_len]   = '\0';
+	const char* name = basename(str2);
+
+	result = sprintf(str, "/proc/%d/maps", static_cast<int>(pid));
+
+	memset(&s, 0, sizeof(sys_dbg_stack_info_t));
+
+	FILE* f = fopen(str, "r");
+
+	if (f == nullptr)
+	{
+		return;
+	}
+
+	// printf("&str = %"I64"x\n", (uint64_t)&str);
+
+	uint64_t                  addr                 = 0;
+	uint64_t                  endaddr              = 0;
+	[[maybe_unused]] uint64_t size                 = 0;
+	uint64_t                  offset               = 0;
+	uint64_t                  inode                = 0;
+	char                      permissions[8]       = {};
+	char                      device[8]            = {};
+	char                      filename[MAXPATHLEN] = {};
+
+	auto check_addr = reinterpret_cast<uintptr_t>(&f);
+
+	while (true)
+	{
+		if (feof(f) != 0)
+		{
+			break;
+		}
+
+		if (fgets(str, sizeof(str), f) == nullptr)
+		{
+			break;
+		}
+
+		filename[0]    = 0;
+		permissions[0] = 0;
+		addr           = 0;
+		size           = 0;
+
+		// printf("%s", str);
+
+		// NOLINTNEXTLINE(cert-err34-c)
+		result = sscanf(str, "%" SCNx64 "-%" SCNx64 " %s %" SCNx64 " %s %" SCNx64 " %s", &addr, &endaddr, permissions, &offset, device,
+		                &inode, filename);
+
+		size = endaddr - addr;
+
+		bool read  = (strchr(permissions, 'r') != nullptr);
+		bool write = (strchr(permissions, 'w') != nullptr);
+		bool exec  = (strchr(permissions, 'x') != nullptr);
+
+		// printf("%016"I64"x, %"I64"d, %s, %d, %d\n", addr, size, filename, read, write);
+
+		if (read && write && !exec && strncmp(filename, "[stack", 6) == 0)
+		{
+			// printf("stack: %016"I64"x, %"I64"d\n", addr, size);
+
+			if (check_addr >= addr && check_addr < addr + size)
+			{
+				s.addr          = addr;
+				s.total_size    = size;
+				s.commited_addr = addr;
+				s.commited_size = size;
+
+				if (s.code_addr != 0)
+				{
+					break;
+				}
+			}
+		}
+
+		if (read && !write && exec && strstr(filename, name) != nullptr)
+		{
+			s.code_addr = addr;
+			s.code_size = size;
+
+			if (s.addr != 0)
+			{
+				break;
+			}
+		}
+	}
+
+	result = fclose(f);
+}
+
+void sys_get_code_info(uintptr_t* addr, size_t* size)
+{
+	if (g_stack.code_size == 0)
+	{
+		sys_stack_usage(g_stack);
+	}
+
+	*addr = g_stack.code_addr;
+	*size = g_stack.code_size;
+}
+
+void sys_set_exception_filter(exception_filter_func_t /*func*/) {}
+
+} // namespace Kyty
+#endif