compiler: add support for $if x32, x64, big_endian, little_endian

vlib/compiler/cheaders.v

@@ -12,6 +12,22 @@ c_headers = '
 #include <stdarg.h> // for va_list
 #include <string.h> // memcpy
 
+#if INTPTR_MAX == INT32_MAX
+    #define TARGET_IS_32BIT 1
+#elif INTPTR_MAX == INT64_MAX
+    #define TARGET_IS_64BIT 1
+#else
+    #error "The environment is not 32 or 64-bit."
+#endif
+
+#if defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ || defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN || defined(__BIG_ENDIAN__) || defined(__ARMEB__) || defined(__THUMBEB__) || defined(__AARCH64EB__) || defined(_MIBSEB) || defined(__MIBSEB) || defined(__MIBSEB__) 
+    #define TARGET_ORDER_IS_BIG
+#elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ || defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN || defined(__LITTLE_ENDIAN__) || defined(__ARMEL__) || defined(__THUMBEL__) || defined(__AARCH64EL__) || defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__) || defined(_M_AMD64) || defined(_M_X64) || defined(_M_IX86) 
+    #define TARGET_ORDER_IS_LITTLE
+#else
+    #error "Unknown architecture endianness"
+#endif
+
 #ifndef _WIN32
 #include <ctype.h>
 #include <locale.h> // tolower

vlib/compiler/comptime.v

@@ -62,11 +62,20 @@ fn (p mut Parser) comp_time() {
 				p.genln('#endif')
 			}
 		}
+		else if name == 'x64' {
+			p.comptime_if_block('TARGET_IS_64BIT')
+		}
+		else if name == 'x32' {
+			p.comptime_if_block('TARGET_IS_32BIT')
+		}
+		else if name == 'big_endian' {
+			p.comptime_if_block('TARGET_ORDER_IS_BIG')
+		}
+		else if name == 'little_endian' {
+			p.comptime_if_block('TARGET_ORDER_IS_LITTLE')
+		}
 		else if name == 'debug' {
-			p.genln('#ifdef VDEBUG')
-			p.check(.lcbr)
-			p.statements_no_rcbr()
-			p.genln('#endif')
+			p.comptime_if_block('VDEBUG')
 		}
 		else if name == 'tinyc' {
 			p.comptime_if_block('__TINYC__')

vlib/compiler/tests/comptime_bittness_and_endianess_test.v

@@ -0,0 +1,26 @@
+
+fn test_bitness(){
+  mut x := 0
+  $if x32 {
+    println('system is 32 bit')
+    x = 1
+  }
+  $if x64 {
+    println('system is 64 bit')
+    x = 2
+  }
+  assert x > 0
+}
+
+fn test_endianness(){
+  mut x := 0
+  $if little_endian {
+    println('system is little endian')
+    x = 1
+  }
+  $if big_endian {
+    println('system is big endian')
+    x = 2
+  }
+  assert x > 0
+}

vlib/os/os.v

@@ -806,14 +806,14 @@ pub fn chdir(path string) {
 pub fn getwd() string {	
 	$if windows {
 		max := 512 // MAX_PATH * sizeof(wchar_t)
-		buf := &u16(malloc(max*2))
+		buf := &u16(calloc(max*2))
 		if C._wgetcwd(buf, max) == 0 {
 			return ''
 		}
 		return string_from_wide(buf)
 	}
 	$else {
-		buf := malloc(512)
+		buf := calloc(512)
 		if C.getcwd(buf, 512) == 0 {
 			return ''
 		}
@@ -827,7 +827,7 @@ pub fn getwd() string {
 //  and https://insanecoding.blogspot.com/2007/11/implementing-realpath-in-c.html
 // NB: this particular rabbit hole is *deep* ...
 pub fn realpath(fpath string) string {
-	mut fullpath := malloc( MAX_PATH )
+	mut fullpath := calloc( MAX_PATH )
 	mut res := 0
 	$if windows {
 		res = int( C._fullpath( fullpath, fpath.str, MAX_PATH ) )

vlib/runtime/runtime.v

@@ -4,8 +4,6 @@
 
 module runtime
 
-import os
-
 //$if linux {
 fn C.sysconf(name int) i64
 //}
@@ -15,18 +13,32 @@ fn C.GetCurrentProcessorNumber() u32
 //}
 
 pub fn nr_cpus() int {
-	$if linux {
-		return int(C.sysconf(C._SC_NPROCESSORS_ONLN))
-	}
-	$if mac {
-		return int(C.sysconf(C._SC_NPROCESSORS_ONLN))
-	}
 	$if windows {
-		mut nr := int(C.GetCurrentProcessorNumber())
-		if nr == 0 {
-			nr = os.getenv('NUMBER_OF_PROCESSORS').int()
-		}
-		return nr
+		return nr_cpus_win()
 	}
-	return 1
+	return nr_cpus_nix()
+}
+
+pub fn is_32bit() bool {
+	mut x := false
+	$if x32 { x = true }
+	return x
+}
+
+pub fn is_64bit() bool {
+	mut x := false
+	$if x64 { x = true }
+	return x
+}
+
+pub fn is_little_endian() bool {
+	mut x := false
+	$if little_endian { x = true }
+	return x
+}
+
+pub fn is_big_endian() bool {
+	mut x := false
+	$if big_endian { x = true }
+	return x
 }

vlib/runtime/runtime_nix.v

@@ -0,0 +1,16 @@
+module runtime
+
+fn nr_cpus_nix() int {
+	$if linux {
+		return int(C.sysconf(C._SC_NPROCESSORS_ONLN))
+	}
+	$if mac {
+		return int(C.sysconf(C._SC_NPROCESSORS_ONLN))
+	}
+	return 1
+}
+
+fn nr_cpus_win() int {
+	eprintln('nr_cpus_win should be callable only for windows')
+	return 1
+}

vlib/runtime/runtime_test.v

@@ -4,3 +4,31 @@ fn test_nr_cpus() {
 	nr_cpus := runtime.nr_cpus()
 	assert nr_cpus > 0
 }
+
+fn test_is_32bit(){
+	x := runtime.is_32bit().str()
+	assert x == 'true' || x == 'false'
+}
+
+fn test_is_64bit(){
+	x := runtime.is_64bit().str()
+	assert x == 'true' || x == 'false'
+}
+
+fn test_is_little_endian(){
+	x := runtime.is_little_endian().str()
+	assert x == 'true' || x == 'false'
+}
+
+fn test_is_big_endian(){
+	x := runtime.is_big_endian().str()
+	assert x == 'true' || x == 'false'
+}
+
+fn test_is_big_endian_different_than_is_little_endian(){
+	assert runtime.is_big_endian() != runtime.is_little_endian()
+}
+
+fn test_is_32bit_different_than_is_64bit(){	
+	assert runtime.is_32bit() != runtime.is_64bit()
+}

vlib/runtime/runtime_win.v

@@ -1 +1,16 @@
 module runtime
+
+import os
+
+fn nr_cpus_win() int {
+	mut nr := int(C.GetCurrentProcessorNumber())
+	if nr == 0 {
+		nr = os.getenv('NUMBER_OF_PROCESSORS').int()
+	}
+	return nr
+}
+
+fn nr_cpus_nix() int {
+	eprintln('nr_cpus_nix should be callable only for nix platforms')
+	return 1
+}