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Added switch parsing

--- a/flow.c

+++ b/flow.c

@@ -73,12 +73,13 @@

 static struct node *

 do_switch(void)

 {

+	register struct node *e1;

+

 	expect(SWITCH);

 	expect('(');

-	expr();

+	e1 = expr();

 	expect(')');

-	stmt();

-	return NULL;

+	return node2(OSWITCH, e1, stmt());

 }

 static struct node *

--- a/syntax.h

+++ b/syntax.h

@@ -3,7 +3,7 @@

 extern unsigned char curctx;

-enum {

+enum opcode {

 	OARY, OCALL, OFIELD, OPTR, OPOSTINC, OPOSTDEC,

 	OPREINC, OPREDEC, OADDR, OINDIR, OMINUS, OPLUS,

 	OCPL, ONEG, OMUL, ODIV, OMOD, OADD, OSUB, OSHL,

@@ -10,7 +10,7 @@

 	OSHR, OLT, OGT, OGE, OLE, OEQ, ONE, OBAND, OBXOR,

 	OBOR, OAND, OOR, OTERN, OASSIGN, OA_MUL, OA_DIV,

 	OA_MOD, OA_ADD, OA_SUB, OA_SHL, OA_SHR, OA_AND,

-	OA_XOR, OA_OR, OSYM, OCOMP

+	OA_XOR, OA_OR, OSYM, OCOMP, OSWITCH

 };

 struct node;

--- a/tree.c

+++ b/tree.c

@@ -172,7 +172,8 @@

 		[OA_XOR] = {2, "^="},

 		[OA_OR] = {2, "|="},

 		[OSYM] = {0, "sym"},

-		[OCOMP] = {255, "comp"}

+		[OCOMP] = {255, "comp"},

+		[OSWITCH] = {2, "switch"}

 	};

 	assert(np && np->op < ARRAY_SIZE(optab));

-- 

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