X-Git-Url: https://git.m6w6.name/?p=m6w6%2Fext-psi;a=blobdiff_plain;f=m4%2Fpsi_decl.m4;h=6a0ef809916b256dd99e8f7e8cfeedd93c7d2014;hp=c331bbecc658fa4aa8a6f3e7655323cc6e15962d;hb=03100f9c2f83b42bee97e4adcfba5d8821c4ac22;hpb=b1720af16e5d7765e2effcd16e23f351c2f82e54

diff --git a/m4/psi_decl.m4 b/m4/psi_decl.m4
index c331bbe..6a0ef80 100644
--- a/m4/psi_decl.m4
+++ b/m4/psi_decl.m4
@@ -1,45 +1,60 @@
-AC_DEFUN(PSI_REDIR, [psi_symbol=ifelse([$2],[],[$1],[$2])
-	cat >>$PSI_REDIRS <<<"	{\"$1\", (void(*)(void))$psi_symbol}, "])
+# psi_add_redir(name, symbol)
+# Add a function redirection to $PSI_REDIRS.
+psi_add_redir() {
+	cat >>$PSI_REDIRS <<EOF
+	{"$1", (psi_func_ptr) $2}, 
+EOF
+}
 
+# psi_add_decl(decl, options)
+# Add a pre-defined decl to $PSI_VA_DECLS/$PSI_DECLS.
+psi_add_decl() {
+	case "$2" in
+	*vararg*)
+		cat >>$PSI_VA_DECLS <<EOF
+	$1, {0}, 
+EOF
+		;;
+	*)
+		cat >>$PSI_DECLS <<EOF
+	$1, {0}, 
+EOF
+		;;
+	esac
+}
+
+dnl PSI_REDIR(name, custom symbol)
+dnl Create a function redirection to an optional custom symbol.
+AC_DEFUN(PSI_REDIR, [
+	psi_add_redir $1 ifelse([$2],[],[$1],[$2])
+])
+
+dnl PSI_FUNC_LIBC_MAIN()
+dnl Check for the platforms default stub in executables.
 AC_DEFUN(PSI_FUNC_LIBC_MAIN, [
-	AC_REQUIRE([AC_PROG_NM])
 	AC_REQUIRE([AC_PROG_AWK])
 	AC_CACHE_CHECK(for libc start main symbol, psi_cv_libc_main, [
 		psi_libc_main=
 		AC_TRY_LINK(PSI_INCLUDES, [(void)0;], [
-			psi_libc_main=`$NM -g conftest$ac_exeext | $AWK -F" *|@" '/^@<:@@<:@:space:@:>@@:>@+U / {print$[]3; exit}'`
+			psi_libc_main=`nm -g conftest$ac_exeext | $AWK -F ' *|@' '/^@<:@@<:@:space:@:>@@:>@+U / {print$[]3; exit}'`
 		])
 		psi_cv_libc_main=$psi_libc_main
 	])
 ])
 
-dnl PSI_FUNC(fn, action-if-yes, action-if-no)
-AC_DEFUN(PSI_FUNC, [
-	AC_REQUIRE([PSI_FUNC_LIBC_MAIN])
-	psi_symbol=$1
-	AC_CACHE_CHECK(for $1, psi_cv_fn_$1, [
-		psi_symbol_redirect=
-		AC_TRY_LINK(PSI_INCLUDES, [
-			void (*fn)(void) = (void (*)(void)) $psi_symbol;
-		], [
-			psi_symbol_redirect=`$NM -g conftest$ac_exeext | $AWK -F" *|@" '/^@<:@@<:@:space:@:>@@:>@+U '$psi_cv_libc_main'/ {next} /^@<:@@<:@:space:@:>@@:>@+U / {print$[]3; exit}'`
-		])
-		psi_cv_fn_$1=$psi_symbol_redirect
-	])
-	case "$psi_cv_fn_$1" in
-	"")
-		$3
-		;;
-	"$psi_symbol"|"_$psi_symbol")
-		$2
-		;;
-	*)
-		$2
-		PSI_REDIR($1)
-		;;
-	esac
+dnl PSI_DECL_ARGS(decl args)
+dnl INTERNAL: build psi_decl_args
+AC_DEFUN(PSI_DECL_ARGS, [
+	psi_decl_args=
+	PSI_DECL_ARG($1)
+	m4_case([$2],
+		[(void)], [],
+		[()], [],
+		[m4_map_args_sep([PSI_DECL_ARG(m4_normalize(], [))], [], m4_bregexp([$2], [(\(.*\))], [\1]))])
 ])
 
+dnl PSI_DECL_ARG(decl arg)
+dnl INTERNAL: build psi_decl_args
 AC_DEFUN(PSI_DECL_ARG, [
     m4_define([member_name], PSI_VAR_NAME($1))
     m4_define([member_type], PSI_VAR_TYPE($1))
@@ -52,23 +67,38 @@ AC_DEFUN(PSI_DECL_ARG, [
 ])
 
 dnl PSI_DECL(type func, args, flags)
+dnl Check for a function or macro declaration and a possible asm redirection.
+dnl Adds a pre-defined (vararg) decl to $PSI_VA_DECLS/$PSI_DECLS.
+dnl Calls PSI_MACRO if PSI_FUNC fails. 
 AC_DEFUN(PSI_DECL, [
-	psi_decl_args=
-	PSI_DECL_ARG($1)
-	m4_case([$2],
-		[(void)], [],
-		[()], [],
-		[m4_map_args_sep([PSI_DECL_ARG(m4_normalize(], [))], [], m4_bregexp([$2], [(\(.*\))], [\1]))])
-	PSI_FUNC(PSI_VAR_NAME($1), [
-		ifelse([$3], vararg, [
-			cat >>$PSI_VA_DECLS <<<"	$psi_decl_args, {0}, "
+	AC_REQUIRE([PSI_FUNC_LIBC_MAIN])
+	PSI_DECL_ARGS($1, $2)
+	
+	psi_symbol="PSI_VAR_NAME($1)"
+	AC_CACHE_CHECK(for PSI_VAR_NAME($1), [psi_cv_fn_]PSI_VAR_NAME($1), [
+		psi_symbol_redirect=
+		AC_TRY_LINK(PSI_INCLUDES, [
+			void (*fn)(void) = (void (*)(void)) $psi_symbol; (*fn)()
 		], [
-			cat >>$PSI_DECLS <<<"	$psi_decl_args, {0}, "
-		])
-	], [
-		PSI_MACRO($1, $2, [
-			ifelse([$3], vararg, AC_MSG_ERROR(varargs macro support is not implemented),[])
-			cat >>$PSI_DECLS <<<"	$psi_decl_args, {0}, "
+			psi_symbol_redirect=`nm -g conftest$ac_exeext | $AWK -F ' *|@' '/^@<:@@<:@:space:@:>@@:>@+U '$psi_cv_libc_main'/ {next} /^@<:@@<:@:space:@:>@@:>@+U / {print$[]3; exit}'`
 		])
+		[psi_cv_fn_]PSI_VAR_NAME($1)=$psi_symbol_redirect
 	])
+	case "$[psi_cv_fn_]PSI_VAR_NAME($1)" in
+	"$psi_symbol"|"_$psi_symbol")
+		psi_add_decl "$psi_decl_args" $3
+		;;
+	"")
+		ifelse([$3], vararg, [
+			AC_MSG_ERROR(varargs macro support is not implemented)
+		],[
+			PSI_MACRO($1, $2, [
+				psi_add_decl "$psi_decl_args"
+			])
+		])
+		;;
+	"*")
+		PSI_REDIR($psi_symbol, $psi_symbol_redirect)
+		;;
+	esac
 ])