X-Git-Url: https://git.m6w6.name/?p=m6w6%2Fext-psi;a=blobdiff_plain;f=m4%2Fpsi%2Fpsi_decl.m4;fp=m4%2Fpsi%2Fpsi_decl.m4;h=9730839a5c1903f43f626202281dfeb556896b32;hp=0000000000000000000000000000000000000000;hb=c9b3436bd51a4dcf7d6cc6817d4c7a8ad99538d4;hpb=09735ea6055f959a9cac481268754f07d6f6eb9f

diff --git a/m4/psi/psi_decl.m4 b/m4/psi/psi_decl.m4
new file mode 100644
index 0000000..9730839
--- /dev/null
+++ b/m4/psi/psi_decl.m4
@@ -0,0 +1,125 @@
+# 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 "$2" in
+ *functor*)
+		cat >>$PSI_FN_DECLS <<EOF
+	$1, {0},
+EOF
+		;;
+	*vararg*)
+		cat >>$PSI_VA_DECLS <<EOF
+	$1, {0}, 
+EOF
+		;;
+	*)
+		cat >>$PSI_DECLS <<EOF
+	$1, {0}, 
+EOF
+		;;
+	esac
+}
+
+dnl PSI_DECL_TYPE(type functor_name, args)
+dnl Adds a pre-defined functor decl to $PSI_FN_DECLS.
+AC_DEFUN(PSI_DECL_TYPE, [
+	PSI_DECL_ARGS($1, $2)
+	psi_add_decl "$psi_decl_args" functor
+])
+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],[$2])
+])
+
+dnl PSI_FUNC_LIBC_MAIN()
+dnl Check for the platforms default stub in executables.
+AC_DEFUN(PSI_FUNC_LIBC_MAIN, [
+	AC_REQUIRE([AC_PROG_AWK])
+	AC_CACHE_CHECK(for libc start main symbol, psi_cv_libc_main, [
+		psi_libc_main=
+		AC_TRY_LINK(PSI_INCLUDES, [(void)0;], [
+			psi_libc_main=`nm -g conftest$ac_exeext | $AWK -F ' *|@' '/^@<:@@<:@:space:@:>@@:>@+U / {print$[]3; exit}'`
+		])
+		psi_cv_libc_main=$psi_libc_main
+	])
+])
+
+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))
+
+	PSI_TYPE_INDIRECTION([$1],, pl, as)
+    if test -n "$psi_decl_args"; then
+        psi_decl_args="$psi_decl_args, "
+    fi
+    psi_decl_args="[$psi_decl_args{]PSI_TYPE_PAIR(member_type)[, \"]member_name[\",] $pl, $as[}]"
+])
+
+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, [
+	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)) $psi_symbol; (*fn)()
+		], [
+			psi_symbol_redirect=`nm -g conftest$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"|"_$psi_symbol")
+		case "$PHP_DEBUG-$3" in
+		"1-")
+			PSI_MACRO($1, $2, [
+				psi_add_decl "$psi_decl_args"
+			])
+			;;
+		*)
+			psi_add_decl "$psi_decl_args" $3
+			;;
+		esac
+		;;
+	"")
+		ifelse([$3], vararg, [
+			AC_MSG_ERROR(varargs macro support is not implemented)
+		],[
+			PSI_MACRO($1, $2, [
+				psi_add_decl "$psi_decl_args"
+			])
+		])
+		;;
+	*)
+		PSI_REDIR($psi_symbol)
+		psi_add_decl "$psi_decl_args" $3
+		;;
+	esac
+])