compiler, runtime: panic on uncomparable map key, even if map is empty
This ports https://golang.org/cl/155918 from the master repo. runtime: panic on uncomparable map key, even if map is empty Reorg map flags a bit so we don't need any extra space for the extra flag. This is a pre-req for updating libgo to the Go 1.12beta2 release. Reviewed-on: https://go-review.googlesource.com/c/157858 From-SVN: r267950
This commit is contained in:
parent
a81a6d5836
commit
6a0c8e77f2
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@ -1,4 +1,4 @@
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0d64279c01a37b2579c0c62ca4f2c3e3f81de07c
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87005025fcd0d7e7908b3aae7062b52cb80eb0f3
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The first line of this file holds the git revision number of the last
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merge done from the gofrontend repository.
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@ -5839,6 +5839,25 @@ Struct_type::do_needs_key_update()
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return false;
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}
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// Return whether computing the hash value of an instance of this
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// struct type might panic.
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bool
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Struct_type::do_hash_might_panic()
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{
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const Struct_field_list* fields = this->fields_;
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if (fields == NULL)
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return false;
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for (Struct_field_list::const_iterator pf = fields->begin();
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pf != fields->end();
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++pf)
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{
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if (pf->type()->hash_might_panic())
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return true;
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}
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return false;
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}
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// Return whether this struct type is permitted to be in the heap.
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bool
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@ -7979,21 +7998,18 @@ Map_type::make_map_type_descriptor_type()
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Type* ptdt = Type::make_type_descriptor_ptr_type();
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Type* uint8_type = Type::lookup_integer_type("uint8");
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Type* uint16_type = Type::lookup_integer_type("uint16");
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Type* bool_type = Type::lookup_bool_type();
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Type* uint32_type = Type::lookup_integer_type("uint32");
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Struct_type* sf =
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Type::make_builtin_struct_type(11,
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Type::make_builtin_struct_type(8,
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"", tdt,
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"key", ptdt,
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"elem", ptdt,
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"bucket", ptdt,
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"keysize", uint8_type,
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"indirectkey", bool_type,
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"valuesize", uint8_type,
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"indirectvalue", bool_type,
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"bucketsize", uint16_type,
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"reflexivekey", bool_type,
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"needkeyupdate", bool_type);
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"flags", uint32_type);
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ret = Type::make_builtin_named_type("MapType", sf);
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}
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@ -8011,6 +8027,7 @@ Map_type::do_type_descriptor(Gogo* gogo, Named_type* name)
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Type* mtdt = Map_type::make_map_type_descriptor_type();
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Type* uint8_type = Type::lookup_integer_type("uint8");
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Type* uint16_type = Type::lookup_integer_type("uint16");
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Type* uint32_type = Type::lookup_integer_type("uint32");
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int64_t keysize;
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if (!this->key_type_->backend_type_size(gogo, &keysize))
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@ -8077,11 +8094,6 @@ Map_type::do_type_descriptor(Gogo* gogo, Named_type* name)
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else
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vals->push_back(Expression::make_integer_int64(keysize, uint8_type, bloc));
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++p;
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go_assert(p->is_field_name("indirectkey"));
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vals->push_back(Expression::make_boolean(keysize > Map_type::max_key_size,
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bloc));
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++p;
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go_assert(p->is_field_name("valuesize"));
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if (valsize > Map_type::max_val_size)
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@ -8089,25 +8101,27 @@ Map_type::do_type_descriptor(Gogo* gogo, Named_type* name)
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else
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vals->push_back(Expression::make_integer_int64(valsize, uint8_type, bloc));
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++p;
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go_assert(p->is_field_name("indirectvalue"));
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vals->push_back(Expression::make_boolean(valsize > Map_type::max_val_size,
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bloc));
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++p;
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go_assert(p->is_field_name("bucketsize"));
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vals->push_back(Expression::make_integer_int64(bucketsize, uint16_type,
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bloc));
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++p;
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go_assert(p->is_field_name("reflexivekey"));
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vals->push_back(Expression::make_boolean(this->key_type_->is_reflexive(),
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bloc));
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++p;
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go_assert(p->is_field_name("needkeyupdate"));
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vals->push_back(Expression::make_boolean(this->key_type_->needs_key_update(),
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bloc));
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go_assert(p->is_field_name("flags"));
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// As with the other fields, the flag bits must match the reflect
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// and runtime packages.
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unsigned long flags = 0;
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if (keysize > Map_type::max_key_size)
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flags |= 1;
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if (valsize > Map_type::max_val_size)
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flags |= 2;
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if (this->key_type_->is_reflexive())
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flags |= 4;
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if (this->key_type_->needs_key_update())
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flags |= 8;
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if (this->key_type_->hash_might_panic())
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flags |= 16;
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vals->push_back(Expression::make_integer_ul(flags, uint32_type, bloc));
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++p;
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go_assert(p == fields->end());
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@ -635,6 +635,12 @@ class Type
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needs_key_update()
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{ return this->do_needs_key_update(); }
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// Return whether the hash function of this type might panic. This
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// is only called for types used as a key in a map type.
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bool
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hash_might_panic()
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{ return this->do_hash_might_panic(); }
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// Whether the type is permitted in the heap.
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bool
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in_heap()
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@ -1073,6 +1079,10 @@ class Type
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do_needs_key_update()
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{ return false; }
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virtual bool
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do_hash_might_panic()
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{ return false; }
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virtual bool
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do_in_heap()
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{ return true; }
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@ -2600,6 +2610,9 @@ class Struct_type : public Type
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bool
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do_needs_key_update();
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bool
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do_hash_might_panic();
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bool
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do_in_heap();
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@ -2778,6 +2791,10 @@ class Array_type : public Type
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do_needs_key_update()
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{ return this->element_type_->needs_key_update(); }
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bool
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do_hash_might_panic()
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{ return this->length_ != NULL && this->element_type_->hash_might_panic(); }
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bool
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do_in_heap()
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{ return this->length_ == NULL || this->element_type_->in_heap(); }
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@ -3170,6 +3187,11 @@ class Interface_type : public Type
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do_needs_key_update()
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{ return true; }
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// Hashing an unhashable type stored in an interface might panic.
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bool
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do_hash_might_panic()
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{ return true; }
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unsigned int
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do_hash_for_method(Gogo*, int) const;
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@ -347,16 +347,13 @@ type interfaceType struct {
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// mapType represents a map type.
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type mapType struct {
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rtype
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key *rtype // map key type
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elem *rtype // map element (value) type
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bucket *rtype // internal bucket structure
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keysize uint8 // size of key slot
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indirectkey uint8 // store ptr to key instead of key itself
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valuesize uint8 // size of value slot
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indirectvalue uint8 // store ptr to value instead of value itself
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bucketsize uint16 // size of bucket
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reflexivekey bool // true if k==k for all keys
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needkeyupdate bool // true if we need to update key on an overwrite
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key *rtype // map key type
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elem *rtype // map element (value) type
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bucket *rtype // internal bucket structure
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keysize uint8 // size of key slot
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valuesize uint8 // size of value slot
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bucketsize uint16 // size of bucket
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flags uint32
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}
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// ptrType represents a pointer type.
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@ -1506,6 +1503,8 @@ func MapOf(key, elem Type) Type {
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s := "map[" + *ktyp.string + "]" + *etyp.string
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// Make a map type.
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// Note: flag values must match those used in the TMAP case
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// in ../cmd/compile/internal/gc/reflect.go:dtypesym.
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var imap interface{} = (map[unsafe.Pointer]unsafe.Pointer)(nil)
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mt := **(**mapType)(unsafe.Pointer(&imap))
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mt.string = &s
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@ -1520,23 +1519,29 @@ func MapOf(key, elem Type) Type {
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mt.ptrToThis = nil
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mt.bucket = bucketOf(ktyp, etyp)
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mt.flags = 0
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if ktyp.size > maxKeySize {
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mt.keysize = uint8(ptrSize)
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mt.indirectkey = 1
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mt.flags |= 1 // indirect key
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} else {
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mt.keysize = uint8(ktyp.size)
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mt.indirectkey = 0
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}
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if etyp.size > maxValSize {
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mt.valuesize = uint8(ptrSize)
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mt.indirectvalue = 1
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mt.flags |= 2 // indirect value
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} else {
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mt.valuesize = uint8(etyp.size)
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mt.indirectvalue = 0
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}
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mt.bucketsize = uint16(mt.bucket.size)
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mt.reflexivekey = isReflexive(ktyp)
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mt.needkeyupdate = needKeyUpdate(ktyp)
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if isReflexive(ktyp) {
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mt.flags |= 4
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}
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if needKeyUpdate(ktyp) {
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mt.flags |= 8
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}
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if hashMightPanic(ktyp) {
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mt.flags |= 16
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}
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// Canonicalize before storing in lookupCache
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ti := toType(&mt.rtype)
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@ -1715,6 +1720,27 @@ func needKeyUpdate(t *rtype) bool {
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}
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}
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// hashMightPanic reports whether the hash of a map key of type t might panic.
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func hashMightPanic(t *rtype) bool {
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switch t.Kind() {
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case Interface:
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return true
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case Array:
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tt := (*arrayType)(unsafe.Pointer(t))
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return hashMightPanic(tt.elem)
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case Struct:
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tt := (*structType)(unsafe.Pointer(t))
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for _, f := range tt.fields {
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if hashMightPanic(f.typ) {
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return true
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}
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}
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return false
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default:
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return false
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}
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}
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// Make sure these routines stay in sync with ../../runtime/map.go!
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// These types exist only for GC, so we only fill out GC relevant info.
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// Currently, that's just size and the GC program. We also fill in string
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@ -414,14 +414,17 @@ func mapaccess1(t *maptype, h *hmap, key unsafe.Pointer) unsafe.Pointer {
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if msanenabled && h != nil {
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msanread(key, t.key.size)
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}
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hashfn := t.key.hashfn
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equalfn := t.key.equalfn
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if h == nil || h.count == 0 {
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if t.hashMightPanic() {
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hashfn(key, 0) // see issue 23734
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}
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return unsafe.Pointer(&zeroVal[0])
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}
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if h.flags&hashWriting != 0 {
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throw("concurrent map read and map write")
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}
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hashfn := t.key.hashfn
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equalfn := t.key.equalfn
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hash := hashfn(key, uintptr(h.hash0))
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m := bucketMask(h.B)
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b := (*bmap)(add(h.buckets, (hash&m)*uintptr(t.bucketsize)))
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@ -442,12 +445,12 @@ func mapaccess1(t *maptype, h *hmap, key unsafe.Pointer) unsafe.Pointer {
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continue
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}
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k := add(unsafe.Pointer(b), dataOffset+i*uintptr(t.keysize))
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if t.indirectkey {
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if t.indirectkey() {
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k = *((*unsafe.Pointer)(k))
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}
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if equalfn(key, k) {
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v := add(unsafe.Pointer(b), dataOffset+bucketCnt*uintptr(t.keysize)+i*uintptr(t.valuesize))
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if t.indirectvalue {
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if t.indirectvalue() {
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v = *((*unsafe.Pointer)(v))
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}
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return v
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@ -472,14 +475,17 @@ func mapaccess2(t *maptype, h *hmap, key unsafe.Pointer) (unsafe.Pointer, bool)
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if msanenabled && h != nil {
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msanread(key, t.key.size)
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}
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hashfn := t.key.hashfn
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equalfn := t.key.equalfn
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if h == nil || h.count == 0 {
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if t.hashMightPanic() {
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hashfn(key, 0) // see issue 23734
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}
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return unsafe.Pointer(&zeroVal[0]), false
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}
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if h.flags&hashWriting != 0 {
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throw("concurrent map read and map write")
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}
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hashfn := t.key.hashfn
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equalfn := t.key.equalfn
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hash := hashfn(key, uintptr(h.hash0))
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m := bucketMask(h.B)
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b := (*bmap)(unsafe.Pointer(uintptr(h.buckets) + (hash&m)*uintptr(t.bucketsize)))
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@ -500,12 +506,12 @@ func mapaccess2(t *maptype, h *hmap, key unsafe.Pointer) (unsafe.Pointer, bool)
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continue
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}
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k := add(unsafe.Pointer(b), dataOffset+i*uintptr(t.keysize))
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if t.indirectkey {
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if t.indirectkey() {
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k = *((*unsafe.Pointer)(k))
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}
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if equalfn(key, k) {
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v := add(unsafe.Pointer(b), dataOffset+bucketCnt*uintptr(t.keysize)+i*uintptr(t.valuesize))
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if t.indirectvalue {
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if t.indirectvalue() {
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v = *((*unsafe.Pointer)(v))
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}
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return v, true
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@ -547,12 +553,12 @@ func mapaccessK(t *maptype, h *hmap, key unsafe.Pointer) (unsafe.Pointer, unsafe
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continue
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}
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k := add(unsafe.Pointer(b), dataOffset+i*uintptr(t.keysize))
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if t.indirectkey {
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if t.indirectkey() {
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k = *((*unsafe.Pointer)(k))
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}
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if equalfn(key, k) {
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v := add(unsafe.Pointer(b), dataOffset+bucketCnt*uintptr(t.keysize)+i*uintptr(t.valuesize))
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if t.indirectvalue {
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if t.indirectvalue() {
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v = *((*unsafe.Pointer)(v))
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}
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return k, v
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|
@ -634,14 +640,14 @@ again:
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|||
continue
|
||||
}
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k := add(unsafe.Pointer(b), dataOffset+i*uintptr(t.keysize))
|
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if t.indirectkey {
|
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if t.indirectkey() {
|
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k = *((*unsafe.Pointer)(k))
|
||||
}
|
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if !equalfn(key, k) {
|
||||
continue
|
||||
}
|
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// already have a mapping for key. Update it.
|
||||
if t.needkeyupdate {
|
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if t.needkeyupdate() {
|
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typedmemmove(t.key, k, key)
|
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}
|
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val = add(unsafe.Pointer(b), dataOffset+bucketCnt*uintptr(t.keysize)+i*uintptr(t.valuesize))
|
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|
@ -672,12 +678,12 @@ again:
|
|||
}
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||||
|
||||
// store new key/value at insert position
|
||||
if t.indirectkey {
|
||||
if t.indirectkey() {
|
||||
kmem := newobject(t.key)
|
||||
*(*unsafe.Pointer)(insertk) = kmem
|
||||
insertk = kmem
|
||||
}
|
||||
if t.indirectvalue {
|
||||
if t.indirectvalue() {
|
||||
vmem := newobject(t.elem)
|
||||
*(*unsafe.Pointer)(val) = vmem
|
||||
}
|
||||
|
@ -690,7 +696,7 @@ done:
|
|||
throw("concurrent map writes")
|
||||
}
|
||||
h.flags &^= hashWriting
|
||||
if t.indirectvalue {
|
||||
if t.indirectvalue() {
|
||||
val = *((*unsafe.Pointer)(val))
|
||||
}
|
||||
return val
|
||||
|
@ -706,15 +712,18 @@ func mapdelete(t *maptype, h *hmap, key unsafe.Pointer) {
|
|||
if msanenabled && h != nil {
|
||||
msanread(key, t.key.size)
|
||||
}
|
||||
hashfn := t.key.hashfn
|
||||
equalfn := t.key.equalfn
|
||||
if h == nil || h.count == 0 {
|
||||
if t.hashMightPanic() {
|
||||
hashfn(key, 0) // see issue 23734
|
||||
}
|
||||
return
|
||||
}
|
||||
if h.flags&hashWriting != 0 {
|
||||
throw("concurrent map writes")
|
||||
}
|
||||
|
||||
hashfn := t.key.hashfn
|
||||
equalfn := t.key.equalfn
|
||||
hash := hashfn(key, uintptr(h.hash0))
|
||||
|
||||
// Set hashWriting after calling alg.hash, since alg.hash may panic,
|
||||
|
@ -735,20 +744,20 @@ search:
|
|||
}
|
||||
k := add(unsafe.Pointer(b), dataOffset+i*uintptr(t.keysize))
|
||||
k2 := k
|
||||
if t.indirectkey {
|
||||
if t.indirectkey() {
|
||||
k2 = *((*unsafe.Pointer)(k2))
|
||||
}
|
||||
if !equalfn(key, k2) {
|
||||
continue
|
||||
}
|
||||
// Only clear key if there are pointers in it.
|
||||
if t.indirectkey {
|
||||
if t.indirectkey() {
|
||||
*(*unsafe.Pointer)(k) = nil
|
||||
} else if t.key.kind&kindNoPointers == 0 {
|
||||
memclrHasPointers(k, t.key.size)
|
||||
}
|
||||
v := add(unsafe.Pointer(b), dataOffset+bucketCnt*uintptr(t.keysize)+i*uintptr(t.valuesize))
|
||||
if t.indirectvalue {
|
||||
if t.indirectvalue() {
|
||||
*(*unsafe.Pointer)(v) = nil
|
||||
} else if t.elem.kind&kindNoPointers == 0 {
|
||||
memclrHasPointers(v, t.elem.size)
|
||||
|
@ -894,7 +903,7 @@ next:
|
|||
continue
|
||||
}
|
||||
k := add(unsafe.Pointer(b), dataOffset+uintptr(offi)*uintptr(t.keysize))
|
||||
if t.indirectkey {
|
||||
if t.indirectkey() {
|
||||
k = *((*unsafe.Pointer)(k))
|
||||
}
|
||||
v := add(unsafe.Pointer(b), dataOffset+bucketCnt*uintptr(t.keysize)+uintptr(offi)*uintptr(t.valuesize))
|
||||
|
@ -906,7 +915,7 @@ next:
|
|||
// through the oldbucket, skipping any keys that will go
|
||||
// to the other new bucket (each oldbucket expands to two
|
||||
// buckets during a grow).
|
||||
if t.reflexivekey || equalfn(k, k) {
|
||||
if t.reflexivekey() || equalfn(k, k) {
|
||||
// If the item in the oldbucket is not destined for
|
||||
// the current new bucket in the iteration, skip it.
|
||||
hash := hashfn(k, uintptr(h.hash0))
|
||||
|
@ -927,13 +936,13 @@ next:
|
|||
}
|
||||
}
|
||||
if (b.tophash[offi] != evacuatedX && b.tophash[offi] != evacuatedY) ||
|
||||
!(t.reflexivekey || equalfn(k, k)) {
|
||||
!(t.reflexivekey() || equalfn(k, k)) {
|
||||
// This is the golden data, we can return it.
|
||||
// OR
|
||||
// key!=key, so the entry can't be deleted or updated, so we can just return it.
|
||||
// That's lucky for us because when key!=key we can't look it up successfully.
|
||||
it.key = k
|
||||
if t.indirectvalue {
|
||||
if t.indirectvalue() {
|
||||
v = *((*unsafe.Pointer)(v))
|
||||
}
|
||||
it.value = v
|
||||
|
@ -1157,7 +1166,7 @@ func evacuate(t *maptype, h *hmap, oldbucket uintptr) {
|
|||
throw("bad map state")
|
||||
}
|
||||
k2 := k
|
||||
if t.indirectkey {
|
||||
if t.indirectkey() {
|
||||
k2 = *((*unsafe.Pointer)(k2))
|
||||
}
|
||||
var useY uint8
|
||||
|
@ -1165,7 +1174,7 @@ func evacuate(t *maptype, h *hmap, oldbucket uintptr) {
|
|||
// Compute hash to make our evacuation decision (whether we need
|
||||
// to send this key/value to bucket x or bucket y).
|
||||
hash := t.key.hashfn(k2, uintptr(h.hash0))
|
||||
if h.flags&iterator != 0 && !t.reflexivekey && !t.key.equalfn(k2, k2) {
|
||||
if h.flags&iterator != 0 && !t.reflexivekey() && !t.key.equalfn(k2, k2) {
|
||||
// If key != key (NaNs), then the hash could be (and probably
|
||||
// will be) entirely different from the old hash. Moreover,
|
||||
// it isn't reproducible. Reproducibility is required in the
|
||||
|
@ -1200,12 +1209,12 @@ func evacuate(t *maptype, h *hmap, oldbucket uintptr) {
|
|||
dst.v = add(dst.k, bucketCnt*uintptr(t.keysize))
|
||||
}
|
||||
dst.b.tophash[dst.i&(bucketCnt-1)] = top // mask dst.i as an optimization, to avoid a bounds check
|
||||
if t.indirectkey {
|
||||
if t.indirectkey() {
|
||||
*(*unsafe.Pointer)(dst.k) = k2 // copy pointer
|
||||
} else {
|
||||
typedmemmove(t.key, dst.k, k) // copy value
|
||||
}
|
||||
if t.indirectvalue {
|
||||
if t.indirectvalue() {
|
||||
*(*unsafe.Pointer)(dst.v) = *(*unsafe.Pointer)(v)
|
||||
} else {
|
||||
typedmemmove(t.elem, dst.v, v)
|
||||
|
@ -1271,12 +1280,12 @@ func reflect_makemap(t *maptype, cap int) *hmap {
|
|||
if !ismapkey(t.key) {
|
||||
throw("runtime.reflect_makemap: unsupported map key type")
|
||||
}
|
||||
if t.key.size > maxKeySize && (!t.indirectkey || t.keysize != uint8(sys.PtrSize)) ||
|
||||
t.key.size <= maxKeySize && (t.indirectkey || t.keysize != uint8(t.key.size)) {
|
||||
if t.key.size > maxKeySize && (!t.indirectkey() || t.keysize != uint8(sys.PtrSize)) ||
|
||||
t.key.size <= maxKeySize && (t.indirectkey() || t.keysize != uint8(t.key.size)) {
|
||||
throw("key size wrong")
|
||||
}
|
||||
if t.elem.size > maxValueSize && (!t.indirectvalue || t.valuesize != uint8(sys.PtrSize)) ||
|
||||
t.elem.size <= maxValueSize && (t.indirectvalue || t.valuesize != uint8(t.elem.size)) {
|
||||
if t.elem.size > maxValueSize && (!t.indirectvalue() || t.valuesize != uint8(sys.PtrSize)) ||
|
||||
t.elem.size <= maxValueSize && (t.indirectvalue() || t.valuesize != uint8(t.elem.size)) {
|
||||
throw("value size wrong")
|
||||
}
|
||||
if t.key.align > bucketCnt {
|
||||
|
|
|
@ -86,17 +86,32 @@ type interfacetype struct {
|
|||
}
|
||||
|
||||
type maptype struct {
|
||||
typ _type
|
||||
key *_type
|
||||
elem *_type
|
||||
bucket *_type // internal type representing a hash bucket
|
||||
keysize uint8 // size of key slot
|
||||
indirectkey bool // store ptr to key instead of key itself
|
||||
valuesize uint8 // size of value slot
|
||||
indirectvalue bool // store ptr to value instead of value itself
|
||||
bucketsize uint16 // size of bucket
|
||||
reflexivekey bool // true if k==k for all keys
|
||||
needkeyupdate bool // true if we need to update key on an overwrite
|
||||
typ _type
|
||||
key *_type
|
||||
elem *_type
|
||||
bucket *_type // internal type representing a hash bucket
|
||||
keysize uint8 // size of key slot
|
||||
valuesize uint8 // size of value slot
|
||||
bucketsize uint16 // size of bucket
|
||||
flags uint32
|
||||
}
|
||||
|
||||
// Note: flag values must match those used in the TMAP case
|
||||
// in ../cmd/compile/internal/gc/reflect.go:dtypesym.
|
||||
func (mt *maptype) indirectkey() bool { // store ptr to key instead of key itself
|
||||
return mt.flags&1 != 0
|
||||
}
|
||||
func (mt *maptype) indirectvalue() bool { // store ptr to value instead of value itself
|
||||
return mt.flags&2 != 0
|
||||
}
|
||||
func (mt *maptype) reflexivekey() bool { // true if k==k for all keys
|
||||
return mt.flags&4 != 0
|
||||
}
|
||||
func (mt *maptype) needkeyupdate() bool { // true if we need to update key on an overwrite
|
||||
return mt.flags&8 != 0
|
||||
}
|
||||
func (mt *maptype) hashMightPanic() bool { // true if hash function might panic
|
||||
return mt.flags&16 != 0
|
||||
}
|
||||
|
||||
type arraytype struct {
|
||||
|
|
Loading…
Reference in New Issue