386-related fixes and guards

R=r
DELTA=44  (19 added, 1 deleted, 24 changed)
OCL=29912
CL=29915

src/lib/reflect/type.go

@@ -91,8 +91,8 @@ const (
 	interfacesize = unsafe.Sizeof(x.xinterface);
 )
 
-var missingString = "$missing$"	// syntactic name for undefined type names
-var dotDotDotString = "..."
+const missingString = "$missing$"	// syntactic name for undefined type names
+const dotDotDotString = "..."
 
 // Type is the generic interface to reflection types.  Once its Kind is known,
 // such as ArrayKind, the Type can be narrowed to the appropriate, more

src/lib/reflect/value.go

@@ -61,7 +61,7 @@ func (c *commonValue) Interface() interface {} {
 	switch {
 	case c.typ.Kind() == InterfaceKind:
 		panic("not reached");	// InterfaceValue overrides this method
-	case c.typ.Size() > 8:	// TODO(rsc): how do we know it is 8?
+	case c.typ.Size() > unsafe.Sizeof(uintptr(0)):
 		i = unsafe.Unreflect(uint64(uintptr(c.addr)), c.typ.String(), true);
 	default:
 		if uintptr(c.addr) == 0 {
@@ -872,7 +872,7 @@ var typecache = make(map[string] Type);
 func newValueAddr(typ Type, addr Addr) Value {
 	c, ok := creator[typ.Kind()];
 	if !ok {
-		panicln("no creator for type" , typ.Kind());
+		panicln("no creator for type" , typ.String());
 	}
 	return c(typ, addr);
 }
@@ -945,9 +945,16 @@ func NewValue(e interface {}) Value {
 	typ, ok := typecache[typestring];
 	if !ok {
 		typ = ParseTypeString("", typestring);
+		if typ.Kind() == MissingKind {
+			// This can not happen: unsafe.Reflect should only
+			// ever tell us the names of types that exist.
+			// Of course it does happen, and when it does
+			// it is more helpful to catch it in action here than
+			// to see $missing$ in a later print.
+			panicln("missing type for", typestring);
+		}
 		typecache[typestring] = typ;
 	}
-
 	var ap Addr;
 	if indir {
 		// Content of interface is large and didn't

src/runtime/386/asm.s

@@ -116,7 +116,7 @@ TEXT gosave(SB), 7, $0
 // save AX, jmp to lesstack to switch back
 TEXT	retfromnewstack(SB),7,$0
 	MOVL	4(FS), BX	// m
-	MOVL	AX, 8(BX)	// save AX in m->cret
+	MOVL	AX, 12(BX)	// save AX in m->cret
 	JMP	lessstack(SB)
 
 // gogo, returning 2nd arg instead of 1

src/runtime/hashmap.h

@@ -76,7 +76,7 @@ struct hash;		/* opaque */
 struct hash_subtable;	/* opaque */
 struct hash_entry;	/* opaque */
 
-typedef	uint64 uintptr_t;
+typedef uintptr uintptr_t;
 typedef uintptr_t hash_hash_t;
 
 struct hash_iter {

src/runtime/iface.c

@@ -542,7 +542,7 @@ sys·ifaceE2I2(Sigi *si, Eface e, Iface ret, bool ok)
 	FLUSH(&ok);
 }
 
-static uint64
+static uintptr
 ifacehash1(void *data, Sigt *sigt)
 {
 	int32 alg, wid;
@@ -565,7 +565,7 @@ ifacehash1(void *data, Sigt *sigt)
 	return algarray[alg].hash(wid, data);
 }
 
-uint64
+uintptr
 ifacehash(Iface a)
 {
 	if(a.type == nil)
@@ -573,7 +573,7 @@ ifacehash(Iface a)
 	return ifacehash1(a.data, a.type->sigt);
 }
 
-uint64
+uintptr
 efacehash(Eface a)
 {
 	return ifacehash1(a.data, a.type);

src/runtime/malloc.c

@@ -58,7 +58,10 @@ malloc(uintptr size)
 	}
 
 	// setup for mark sweep
-	mlookup(v, nil, nil, &ref);
+	if(!mlookup(v, nil, nil, &ref)) {
+		printf("malloc %D; mlookup failed\n", (uint64)size);
+		throw("malloc mlookup");
+	}
 	*ref = RefNone;
 
 	m->mallocing = 0;
@@ -93,7 +96,8 @@ free(void *v)
 		throw("malloc/free - deadlock");
 	m->mallocing = 1;
 
-	mlookup(v, nil, nil, &ref);
+	if(!mlookup(v, nil, nil, &ref))
+		throw("free mlookup");
 	*ref = RefFree;
 
 	// Find size class for v.
@@ -283,7 +287,8 @@ stackalloc(uint32 n)
 		return v;
 	}
 	v = malloc(n);
-	mlookup(v, nil, nil, &ref);
+	if(!mlookup(v, nil, nil, &ref))
+		throw("stackalloc mlookup");
 	*ref = RefStack;
 	return v;
 }

src/runtime/runtime.c

@@ -267,15 +267,21 @@ check(void)
  * map and chan helpers for
  * dealing with unknown types
  */
-static uint64
+static uintptr
 memhash(uint32 s, void *a)
 {
 	byte *b;
-	uint64 hash;
+	uintptr hash;
 
 	b = a;
+	if(sizeof(hash) == 4)
+		hash = 2860486313U;
+	else
 		hash = 33054211828000289ULL;
 	while(s > 0) {
+		if(sizeof(hash) == 4)
+			hash = (hash ^ *b) * 3267000013UL;
+		else
 			hash = (hash ^ *b) * 23344194077549503ULL;
 		b++;
 		s--;
@@ -337,7 +343,7 @@ memcopy(uint32 s, void *a, void *b)
 		ba[i] = bb[i];
 }
 
-static uint64
+static uintptr
 strhash(uint32 s, String *a)
 {
 	USED(s);
@@ -358,7 +364,7 @@ strprint(uint32 s, String *a)
 	sys·printstring(*a);
 }
 
-static uint64
+static uintptr
 interhash(uint32 s, Iface *a)
 {
 	USED(s);
@@ -379,7 +385,7 @@ interequal(uint32 s, Iface *a, Iface *b)
 	return ifaceeq(*a, *b);
 }
 
-static uint64
+static uintptr
 nilinterhash(uint32 s, Eface *a)
 {
 	USED(s);
@@ -400,7 +406,7 @@ nilinterequal(uint32 s, Eface *a, Eface *b)
 	return efaceeq(*a, *b);
 }
 
-uint64
+uintptr
 nohash(uint32 s, void *a)
 {
 	USED(s);

src/runtime/runtime.h

@@ -194,7 +194,7 @@ struct	Stktop
 };
 struct	Alg
 {
-	uint64	(*hash)(uint32, void*);
+	uintptr	(*hash)(uint32, void*);
 	uint32	(*equal)(uint32, void*, void*);
 	void	(*print)(uint32, void*);
 	void	(*copy)(uint32, void*, void*);
@@ -333,9 +333,9 @@ MCache*	allocmcache(void);
 void	mallocinit(void);
 bool	ifaceeq(Iface, Iface);
 bool	efaceeq(Eface, Eface);
-uint64	ifacehash(Iface);
-uint64	efacehash(Eface);
-uint64	nohash(uint32, void*);
+uintptr	ifacehash(Iface);
+uintptr	efacehash(Eface);
+uintptr	nohash(uint32, void*);
 uint32	noequal(uint32, void*, void*);
 void*	malloc(uintptr size);
 void*	mallocgc(uintptr size);