From 7b979dd789fe7003c079407894812fbe0f30f5c9 Mon Sep 17 00:00:00 2001
From: Bruce Mitchener <bruce.mitchener@gmail.com>
Date: Wed, 13 Jan 2021 10:01:49 +0700
Subject: [PATCH] Add maiko/platform.h to detect OS + CPU. (#216)

This also adds a bit to the `-info` output to say which OS and CPU
are being targeted.

This can be used in subsequent commits to drive whether or not
we need `BYTESWAP` and whether or not unaligned memory access
is okay.

We'll be able to remove per-platform defines from all of the
makefiles and cmake.
---
 inc/maiko/platform.h | 148 +++++++++++++++++++++++++++++++++++++++++++
 inc/version.h        |   2 +
 src/main.c           |   1 +
 3 files changed, 151 insertions(+)
 create mode 100644 inc/maiko/platform.h

diff --git a/inc/maiko/platform.h b/inc/maiko/platform.h
new file mode 100644
index 0000000..f5f79a5
--- /dev/null
+++ b/inc/maiko/platform.h
@@ -0,0 +1,148 @@
+#ifndef MAIKO_PLATFORM_H
+#define MAIKO_PLATFORM_H 1
+
+/*
+ * Set up various preprocessor definitions based upon
+ * the platform.
+ */
+
+#if defined(__APPLE__) && defined(__MACH__)
+#  define MAIKO_OS_MACOS 1
+#  define MAIKO_OS_NAME "macOS"
+#  define MAIKO_OS_UNIX_LIKE 1
+#  define MAIKO_OS_DETECTED 1
+#endif
+
+#ifdef __CYGWIN__
+#  define MAIKO_OS_CYGWIN 1
+#  define MAIKO_OS_NAME "Cygwin"
+#  define MAIKO_OS_UNIX_LIKE 1
+#  define MAIKO_OS_DETECTED 1
+#endif
+
+#ifdef __DragonFly__
+#  define MAIKO_OS_DRAGONFLYBSD 1
+#  define MAIKO_OS_NAME "DragonFly BSD"
+#  define MAIKO_OS_BSD_LIKE 1
+#  define MAIKO_OS_UNIX_LIKE 1
+#  define MAIKO_OS_DETECTED 1
+#endif
+
+#ifdef __FreeBSD__
+#  define MAIKO_OS_FREEBSD 1
+#  define MAIKO_OS_NAME "FreeBSD"
+#  define MAIKO_OS_BSD_LIKE 1
+#  define MAIKO_OS_UNIX_LIKE 1
+#  define MAIKO_OS_DETECTED 1
+#endif
+
+#ifdef __linux__
+#  define MAIKO_OS_LINUX 1
+#  define MAIKO_OS_NAME "Linux"
+#  define MAIKO_OS_UNIX_LIKE 1
+#  define MAIKO_OS_DETECTED 1
+#endif
+
+#ifdef __NetBSD__
+#  define MAIKO_OS_NETBSD 1
+#  define MAIKO_OS_NAME "NetBSD"
+#  define MAIKO_OS_BSD_LIKE 1
+#  define MAIKO_OS_UNIX_LIKE 1
+#  define MAIKO_OS_DETECTED 1
+#endif
+
+#ifdef __OpenBSD__
+#  define MAIKO_OS_OPENBSD 1
+#  define MAIKO_OS_NAME "OpenBSD"
+#  define MAIKO_OS_BSD_LIKE 1
+#  define MAIKO_OS_UNIX_LIKE 1
+#  define MAIKO_OS_DETECTED 1
+#endif
+
+/* __SVR4: Defined by clang, gcc, and Sun Studio.
+ * __SVR4__ was only defined by Sun Studio. */
+#if defined(__sun) && defined(__SVR4)
+#  define MAIKO_OS_SOLARIS 1
+#  define MAIKO_OS_NAME "Solaris"
+#  define MAIKO_OS_UNIX_LIKE 1
+#  define MAIKO_OS_DETECTED 1
+#endif
+
+#if defined(_WIN32) || defined(__WINDOWS__)
+#  define MAIKO_OS_WINDOWS 1
+#  define MAIKO_OS_NAME "Windows"
+#  define MAIKO_OS_DETECTED 1
+#endif
+
+/* __x86_64__: GNU C, __x86_64: Sun Studio, _M_AMD64: Visual Studio */
+#if defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64)
+#  define MAIKO_ARCH_X86_64 1
+#  define MAIKO_ARCH_NAME "x86_64"
+#  define MAIKO_ARCH_WORD_BITS 64
+#  define MAIKO_ARCH_DETECTED 1
+#endif
+
+/* __arm__: GNU C */
+#ifdef __arm__
+#  define MAIKO_ARCH_ARM 1
+#  define MAIKO_ARCH_NAME "arm"
+#  define MAIKO_ARCH_WORD_BITS 32
+#  define MAIKO_ARCH_DETECTED 1
+#endif
+
+/* __aarch64__: GNU C */
+#ifdef __aarch64__
+#  define MAIKO_ARCH_ARM64 1
+#  define MAIKO_ARCH_NAME "arm64"
+#  define MAIKO_ARCH_WORD_BITS 64
+#  define MAIKO_ARCH_DETECTED 1
+#endif
+
+/* __i386: GNU C, Sun Studio, _M_IX86: Visual Studio */
+#if defined(__i386) || defined(_M_IX86)
+#  define MAIKO_ARCH_X86 1
+#  define MAIKO_ARCH_NAME "x86"
+#  define MAIKO_ARCH_WORD_BITS 32
+#  define MAIKO_ARCH_DETECTED 1
+#endif
+
+#if defined(__ppc__) || defined(__ppc64__)
+#  define MAIKO_ARCH_POWERPC 1
+#  define MAIKO_ARCH_NAME "PowerPC"
+#  ifdef __ppc64__
+#    define MAIKO_ARCH_WORD_BITS 64
+#  else
+#    define MAIKO_ARCH_WORD_BITS 32
+#  endif
+#  define MAIKO_ARCH_DETECTED 1
+#endif
+
+/* Documented at https://github.com/riscv/riscv-toolchain-conventions */
+#ifdef __riscv
+#  define MAIKO_ARCH_RISCV 1
+#  define MAIKO_ARCH_NAME "RISC-V"
+#  define MAIKO_ARCH_WORD_BITS __riscv_xlen
+#  define MAIKO_ARCH_DETECTED 1
+#endif
+
+/* __sparc__: GNU C, __sparc: Sun Studio */
+#if defined(__sparc__) || defined(__sparc)
+#  define MAIKO_ARCH_SPARC 1
+#  define MAIKO_ARCH_NAME "SPARC"
+#  ifdef __sparcv9
+#    define MAIKO_ARCH_WORD_BITS 64
+#  else
+#    define MAIKO_ARCH_WORD_BITS 32
+#  endif
+#  define MAIKO_ARCH_DETECTED 1
+#endif
+
+#ifndef MAIKO_OS_DETECTED
+#  error "Could not detect OS."
+#endif
+
+#ifndef MAIKO_ARCH_DETECTED
+#  error "Could not detect system architecture."
+#endif
+
+#endif /* MAIKO_PLATFORM_H */
diff --git a/inc/version.h b/inc/version.h
index c0d1bac..867f69e 100644
--- a/inc/version.h
+++ b/inc/version.h
@@ -11,6 +11,8 @@
 /*									*/
 /************************************************************************/
 
+#include "maiko/platform.h"
+
 /************************************************************************/
 /*									*/
 /*			V E R S I O N . H			*/
diff --git a/src/main.c b/src/main.c
index 2e09aac..e740460 100644
--- a/src/main.c
+++ b/src/main.c
@@ -736,6 +736,7 @@ void print_info_lines() {
 #elif (RELEASE == 351)
   printf("Emulator for Medley release 3.51\n");
 #endif /* RELEASE */
+  printf("Compiled for %s (%s) (%d bit).\n", MAIKO_OS_NAME, MAIKO_ARCH_NAME, MAIKO_ARCH_WORD_BITS);
   printf("Creation date: %s", ctime(&MDate));
 #ifdef LPSOLVE
   printf("Contains lp_solve LP solver.\n");