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[as] Add section id to symbols

--- a/as/as.h

+++ b/as/as.h

@@ -90,6 +90,7 @@

 	unsigned char flags;

 	unsigned char fill;

 	unsigned char aligment;

+	unsigned id;

 	TUINT base;

 	TUINT max;

 	TUINT curpc;

--- a/as/myro.c

+++ b/as/myro.c

@@ -72,8 +72,12 @@

 	Section *sp;

 	size_t off = 0;

 	struct myrosect sect;

+	unsigned id = 0;;

 	for (sp = seclist; sp; sp = sp->next) {

+		if (id == MYROMAXSEC)

+			die("too many sections for a myro file");

+		sp->id = id++;

 		sect.name = sp->name.offset;

 		sect.flags = getsecflags(sp);

 		sect.fill = sp->fill;

@@ -114,7 +118,7 @@

 			continue;

 		symbol.name = sym->name.offset;

 		symbol.type = -1;

-		symbol.section = -1;

+		symbol.section = sym->section->id;

 		symbol.flags = getsymflags(sym);

 		symbol.offset = sym->value;

 		symbol.len = 0;

--- a/inc/myro.h

+++ b/inc/myro.h

@@ -7,6 +7,8 @@

 #define MYROMAGIC_SIZ   4

 #define MYROMAGIC      "uobj"

+#define MYROMAXSEC    254

+

 struct myrohdr {

 	char magic[4];

 	unsigned long format;