// Protocol Buffers - Google's data interchange format // Copyright 2023 Google LLC. All rights reserved. // // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file or at // https://developers.google.com/open-source/licenses/bsd #include "upb/mini_descriptor/decode.h" #include #include #include #include "upb/base/descriptor_constants.h" #include "upb/base/internal/log2.h" #include "upb/base/status.h" #include "upb/base/string_view.h" #include "upb/mem/arena.h" #include "upb/mini_descriptor/internal/base92.h" #include "upb/mini_descriptor/internal/decoder.h" #include "upb/mini_descriptor/internal/modifiers.h" #include "upb/mini_descriptor/internal/wire_constants.h" #include "upb/mini_table/extension.h" #include "upb/mini_table/field.h" #include "upb/mini_table/internal/field.h" #include "upb/mini_table/internal/message.h" #include "upb/mini_table/message.h" #include "upb/mini_table/sub.h" // Must be last. #include "upb/port/def.inc" // Note: we sort by this number when calculating layout order. typedef enum { kUpb_LayoutItemType_OneofCase, // Oneof case. kUpb_LayoutItemType_OneofField, // Oneof field data. kUpb_LayoutItemType_Field, // Non-oneof field data. kUpb_LayoutItemType_Max = kUpb_LayoutItemType_Field, } upb_LayoutItemType; #define kUpb_LayoutItem_IndexSentinel ((uint16_t)-1) typedef struct { // Index of the corresponding field. When this is a oneof field, the field's // offset will be the index of the next field in a linked list. uint16_t field_index; uint16_t offset; upb_FieldRep rep; upb_LayoutItemType type; } upb_LayoutItem; typedef struct { upb_LayoutItem* data; size_t size; size_t capacity; } upb_LayoutItemVector; typedef struct { upb_MdDecoder base; upb_MiniTable* table; upb_MiniTableField* fields; upb_MiniTablePlatform platform; upb_LayoutItemVector vec; upb_Arena* arena; } upb_MtDecoder; // In each field's offset, we temporarily store a presence classifier: enum PresenceClass { kNoPresence = 0, kHasbitPresence = 1, kRequiredPresence = 2, kOneofBase = 3, // Negative values refer to a specific oneof with that number. Positive // values >= kOneofBase indicate that this field is in a oneof, and specify // the next field in this oneof's linked list. }; static bool upb_MtDecoder_FieldIsPackable(upb_MiniTableField* field) { return (field->UPB_PRIVATE(mode) & kUpb_FieldMode_Array) && upb_FieldType_IsPackable(field->UPB_PRIVATE(descriptortype)); } typedef struct { uint16_t submsg_count; uint16_t subenum_count; } upb_SubCounts; static void upb_MiniTable_SetTypeAndSub(upb_MiniTableField* field, upb_FieldType type, upb_SubCounts* sub_counts, uint64_t msg_modifiers, bool is_proto3_enum) { if (is_proto3_enum) { UPB_ASSERT(type == kUpb_FieldType_Enum); type = kUpb_FieldType_Int32; field->UPB_PRIVATE(mode) |= kUpb_LabelFlags_IsAlternate; } else if (type == kUpb_FieldType_String && !(msg_modifiers & kUpb_MessageModifier_ValidateUtf8)) { type = kUpb_FieldType_Bytes; field->UPB_PRIVATE(mode) |= kUpb_LabelFlags_IsAlternate; } field->UPB_PRIVATE(descriptortype) = type; if (upb_MtDecoder_FieldIsPackable(field) && (msg_modifiers & kUpb_MessageModifier_DefaultIsPacked)) { field->UPB_PRIVATE(mode) |= kUpb_LabelFlags_IsPacked; } if (type == kUpb_FieldType_Message || type == kUpb_FieldType_Group) { field->UPB_PRIVATE(submsg_index) = sub_counts->submsg_count++; } else if (type == kUpb_FieldType_Enum) { // We will need to update this later once we know the total number of // submsg fields. field->UPB_PRIVATE(submsg_index) = sub_counts->subenum_count++; } else { field->UPB_PRIVATE(submsg_index) = kUpb_NoSub; } } static const char kUpb_EncodedToType[] = { [kUpb_EncodedType_Double] = kUpb_FieldType_Double, [kUpb_EncodedType_Float] = kUpb_FieldType_Float, [kUpb_EncodedType_Int64] = kUpb_FieldType_Int64, [kUpb_EncodedType_UInt64] = kUpb_FieldType_UInt64, [kUpb_EncodedType_Int32] = kUpb_FieldType_Int32, [kUpb_EncodedType_Fixed64] = kUpb_FieldType_Fixed64, [kUpb_EncodedType_Fixed32] = kUpb_FieldType_Fixed32, [kUpb_EncodedType_Bool] = kUpb_FieldType_Bool, [kUpb_EncodedType_String] = kUpb_FieldType_String, [kUpb_EncodedType_Group] = kUpb_FieldType_Group, [kUpb_EncodedType_Message] = kUpb_FieldType_Message, [kUpb_EncodedType_Bytes] = kUpb_FieldType_Bytes, [kUpb_EncodedType_UInt32] = kUpb_FieldType_UInt32, [kUpb_EncodedType_OpenEnum] = kUpb_FieldType_Enum, [kUpb_EncodedType_SFixed32] = kUpb_FieldType_SFixed32, [kUpb_EncodedType_SFixed64] = kUpb_FieldType_SFixed64, [kUpb_EncodedType_SInt32] = kUpb_FieldType_SInt32, [kUpb_EncodedType_SInt64] = kUpb_FieldType_SInt64, [kUpb_EncodedType_ClosedEnum] = kUpb_FieldType_Enum, }; static void upb_MiniTable_SetField(upb_MtDecoder* d, uint8_t ch, upb_MiniTableField* field, uint64_t msg_modifiers, upb_SubCounts* sub_counts) { static const char kUpb_EncodedToFieldRep[] = { [kUpb_EncodedType_Double] = kUpb_FieldRep_8Byte, [kUpb_EncodedType_Float] = kUpb_FieldRep_4Byte, [kUpb_EncodedType_Int64] = kUpb_FieldRep_8Byte, [kUpb_EncodedType_UInt64] = kUpb_FieldRep_8Byte, [kUpb_EncodedType_Int32] = kUpb_FieldRep_4Byte, [kUpb_EncodedType_Fixed64] = kUpb_FieldRep_8Byte, [kUpb_EncodedType_Fixed32] = kUpb_FieldRep_4Byte, [kUpb_EncodedType_Bool] = kUpb_FieldRep_1Byte, [kUpb_EncodedType_String] = kUpb_FieldRep_StringView, [kUpb_EncodedType_Bytes] = kUpb_FieldRep_StringView, [kUpb_EncodedType_UInt32] = kUpb_FieldRep_4Byte, [kUpb_EncodedType_OpenEnum] = kUpb_FieldRep_4Byte, [kUpb_EncodedType_SFixed32] = kUpb_FieldRep_4Byte, [kUpb_EncodedType_SFixed64] = kUpb_FieldRep_8Byte, [kUpb_EncodedType_SInt32] = kUpb_FieldRep_4Byte, [kUpb_EncodedType_SInt64] = kUpb_FieldRep_8Byte, [kUpb_EncodedType_ClosedEnum] = kUpb_FieldRep_4Byte, }; char pointer_rep = d->platform == kUpb_MiniTablePlatform_32Bit ? kUpb_FieldRep_4Byte : kUpb_FieldRep_8Byte; int8_t type = _upb_FromBase92(ch); if (ch >= _upb_ToBase92(kUpb_EncodedType_RepeatedBase)) { type -= kUpb_EncodedType_RepeatedBase; field->UPB_PRIVATE(mode) = kUpb_FieldMode_Array; field->UPB_PRIVATE(mode) |= pointer_rep << kUpb_FieldRep_Shift; field->offset = kNoPresence; } else { field->UPB_PRIVATE(mode) = kUpb_FieldMode_Scalar; field->offset = kHasbitPresence; if (type == kUpb_EncodedType_Group || type == kUpb_EncodedType_Message) { field->UPB_PRIVATE(mode) |= pointer_rep << kUpb_FieldRep_Shift; } else if ((unsigned long)type >= sizeof(kUpb_EncodedToFieldRep)) { upb_MdDecoder_ErrorJmp(&d->base, "Invalid field type: %d", (int)type); } else { field->UPB_PRIVATE(mode) |= kUpb_EncodedToFieldRep[type] << kUpb_FieldRep_Shift; } } if ((unsigned long)type >= sizeof(kUpb_EncodedToType)) { upb_MdDecoder_ErrorJmp(&d->base, "Invalid field type: %d", (int)type); } upb_MiniTable_SetTypeAndSub(field, kUpb_EncodedToType[type], sub_counts, msg_modifiers, type == kUpb_EncodedType_OpenEnum); } static void upb_MtDecoder_ModifyField(upb_MtDecoder* d, uint32_t message_modifiers, uint32_t field_modifiers, upb_MiniTableField* field) { if (field_modifiers & kUpb_EncodedFieldModifier_FlipPacked) { if (!upb_MtDecoder_FieldIsPackable(field)) { upb_MdDecoder_ErrorJmp(&d->base, "Cannot flip packed on unpackable field %" PRIu32, field->number); } field->UPB_PRIVATE(mode) ^= kUpb_LabelFlags_IsPacked; } if (field_modifiers & kUpb_EncodedFieldModifier_FlipValidateUtf8) { if (field->UPB_PRIVATE(descriptortype) != kUpb_FieldType_Bytes || !(field->UPB_PRIVATE(mode) & kUpb_LabelFlags_IsAlternate)) { upb_MdDecoder_ErrorJmp( &d->base, "Cannot flip ValidateUtf8 on field %" PRIu32 ", type=%d, mode=%d", field->number, (int)field->UPB_PRIVATE(descriptortype), (int)field->UPB_PRIVATE(mode)); } field->UPB_PRIVATE(descriptortype) = kUpb_FieldType_String; field->UPB_PRIVATE(mode) &= ~kUpb_LabelFlags_IsAlternate; } bool singular = field_modifiers & kUpb_EncodedFieldModifier_IsProto3Singular; bool required = field_modifiers & kUpb_EncodedFieldModifier_IsRequired; // Validate. if ((singular || required) && field->offset != kHasbitPresence) { upb_MdDecoder_ErrorJmp(&d->base, "Invalid modifier(s) for repeated field %" PRIu32, field->number); } if (singular && required) { upb_MdDecoder_ErrorJmp( &d->base, "Field %" PRIu32 " cannot be both singular and required", field->number); } if (singular) field->offset = kNoPresence; if (required) { field->offset = kRequiredPresence; } } static void upb_MtDecoder_PushItem(upb_MtDecoder* d, upb_LayoutItem item) { if (d->vec.size == d->vec.capacity) { size_t new_cap = UPB_MAX(8, d->vec.size * 2); d->vec.data = realloc(d->vec.data, new_cap * sizeof(*d->vec.data)); upb_MdDecoder_CheckOutOfMemory(&d->base, d->vec.data); d->vec.capacity = new_cap; } d->vec.data[d->vec.size++] = item; } static void upb_MtDecoder_PushOneof(upb_MtDecoder* d, upb_LayoutItem item) { if (item.field_index == kUpb_LayoutItem_IndexSentinel) { upb_MdDecoder_ErrorJmp(&d->base, "Empty oneof"); } item.field_index -= kOneofBase; // Push oneof data. item.type = kUpb_LayoutItemType_OneofField; upb_MtDecoder_PushItem(d, item); // Push oneof case. item.rep = kUpb_FieldRep_4Byte; // Field Number. item.type = kUpb_LayoutItemType_OneofCase; upb_MtDecoder_PushItem(d, item); } size_t upb_MtDecoder_SizeOfRep(upb_FieldRep rep, upb_MiniTablePlatform platform) { static const uint8_t kRepToSize32[] = { [kUpb_FieldRep_1Byte] = 1, [kUpb_FieldRep_4Byte] = 4, [kUpb_FieldRep_StringView] = 8, [kUpb_FieldRep_8Byte] = 8, }; static const uint8_t kRepToSize64[] = { [kUpb_FieldRep_1Byte] = 1, [kUpb_FieldRep_4Byte] = 4, [kUpb_FieldRep_StringView] = 16, [kUpb_FieldRep_8Byte] = 8, }; UPB_ASSERT(sizeof(upb_StringView) == UPB_SIZE(kRepToSize32, kRepToSize64)[kUpb_FieldRep_StringView]); return platform == kUpb_MiniTablePlatform_32Bit ? kRepToSize32[rep] : kRepToSize64[rep]; } size_t upb_MtDecoder_AlignOfRep(upb_FieldRep rep, upb_MiniTablePlatform platform) { static const uint8_t kRepToAlign32[] = { [kUpb_FieldRep_1Byte] = 1, [kUpb_FieldRep_4Byte] = 4, [kUpb_FieldRep_StringView] = 4, [kUpb_FieldRep_8Byte] = 8, }; static const uint8_t kRepToAlign64[] = { [kUpb_FieldRep_1Byte] = 1, [kUpb_FieldRep_4Byte] = 4, [kUpb_FieldRep_StringView] = 8, [kUpb_FieldRep_8Byte] = 8, }; UPB_ASSERT(UPB_ALIGN_OF(upb_StringView) == UPB_SIZE(kRepToAlign32, kRepToAlign64)[kUpb_FieldRep_StringView]); return platform == kUpb_MiniTablePlatform_32Bit ? kRepToAlign32[rep] : kRepToAlign64[rep]; } static const char* upb_MtDecoder_DecodeOneofField(upb_MtDecoder* d, const char* ptr, char first_ch, upb_LayoutItem* item) { uint32_t field_num; ptr = upb_MdDecoder_DecodeBase92Varint( &d->base, ptr, first_ch, kUpb_EncodedValue_MinOneofField, kUpb_EncodedValue_MaxOneofField, &field_num); upb_MiniTableField* f = (void*)upb_MiniTable_FindFieldByNumber(d->table, field_num); if (!f) { upb_MdDecoder_ErrorJmp(&d->base, "Couldn't add field number %" PRIu32 " to oneof, no such field number.", field_num); } if (f->offset != kHasbitPresence) { upb_MdDecoder_ErrorJmp( &d->base, "Cannot add repeated, required, or singular field %" PRIu32 " to oneof.", field_num); } // Oneof storage must be large enough to accommodate the largest member. int rep = f->UPB_PRIVATE(mode) >> kUpb_FieldRep_Shift; if (upb_MtDecoder_SizeOfRep(rep, d->platform) > upb_MtDecoder_SizeOfRep(item->rep, d->platform)) { item->rep = rep; } // Prepend this field to the linked list. f->offset = item->field_index; item->field_index = (f - d->fields) + kOneofBase; return ptr; } static const char* upb_MtDecoder_DecodeOneofs(upb_MtDecoder* d, const char* ptr) { upb_LayoutItem item = {.rep = 0, .field_index = kUpb_LayoutItem_IndexSentinel}; while (ptr < d->base.end) { char ch = *ptr++; if (ch == kUpb_EncodedValue_FieldSeparator) { // Field separator, no action needed. } else if (ch == kUpb_EncodedValue_OneofSeparator) { // End of oneof. upb_MtDecoder_PushOneof(d, item); item.field_index = kUpb_LayoutItem_IndexSentinel; // Move to next oneof. } else { ptr = upb_MtDecoder_DecodeOneofField(d, ptr, ch, &item); } } // Push final oneof. upb_MtDecoder_PushOneof(d, item); return ptr; } static const char* upb_MtDecoder_ParseModifier(upb_MtDecoder* d, const char* ptr, char first_ch, upb_MiniTableField* last_field, uint64_t* msg_modifiers) { uint32_t mod; ptr = upb_MdDecoder_DecodeBase92Varint(&d->base, ptr, first_ch, kUpb_EncodedValue_MinModifier, kUpb_EncodedValue_MaxModifier, &mod); if (last_field) { upb_MtDecoder_ModifyField(d, *msg_modifiers, mod, last_field); } else { if (!d->table) { upb_MdDecoder_ErrorJmp(&d->base, "Extensions cannot have message modifiers"); } *msg_modifiers = mod; } return ptr; } static void upb_MtDecoder_AllocateSubs(upb_MtDecoder* d, upb_SubCounts sub_counts) { uint32_t total_count = sub_counts.submsg_count + sub_counts.subenum_count; size_t subs_bytes = sizeof(*d->table->UPB_PRIVATE(subs)) * total_count; upb_MiniTableSub* subs = upb_Arena_Malloc(d->arena, subs_bytes); upb_MdDecoder_CheckOutOfMemory(&d->base, subs); uint32_t i = 0; for (; i < sub_counts.submsg_count; i++) { subs[i].UPB_PRIVATE(submsg) = UPB_PRIVATE(_upb_MiniTable_Empty)(); } if (sub_counts.subenum_count) { upb_MiniTableField* f = d->fields; upb_MiniTableField* end_f = f + d->table->UPB_PRIVATE(field_count); for (; f < end_f; f++) { if (f->UPB_PRIVATE(descriptortype) == kUpb_FieldType_Enum) { f->UPB_PRIVATE(submsg_index) += sub_counts.submsg_count; } } for (; i < sub_counts.submsg_count + sub_counts.subenum_count; i++) { subs[i].UPB_PRIVATE(subenum) = NULL; } } d->table->UPB_PRIVATE(subs) = subs; } static const char* upb_MtDecoder_Parse(upb_MtDecoder* d, const char* ptr, size_t len, void* fields, size_t field_size, uint16_t* field_count, upb_SubCounts* sub_counts) { uint64_t msg_modifiers = 0; uint32_t last_field_number = 0; upb_MiniTableField* last_field = NULL; bool need_dense_below = d->table != NULL; d->base.end = UPB_PTRADD(ptr, len); while (ptr < d->base.end) { char ch = *ptr++; if (ch <= kUpb_EncodedValue_MaxField) { if (!d->table && last_field) { // For extensions, consume only a single field and then return. return --ptr; } upb_MiniTableField* field = fields; *field_count += 1; fields = (char*)fields + field_size; field->number = ++last_field_number; last_field = field; upb_MiniTable_SetField(d, ch, field, msg_modifiers, sub_counts); } else if (kUpb_EncodedValue_MinModifier <= ch && ch <= kUpb_EncodedValue_MaxModifier) { ptr = upb_MtDecoder_ParseModifier(d, ptr, ch, last_field, &msg_modifiers); if (msg_modifiers & kUpb_MessageModifier_IsExtendable) { d->table->UPB_PRIVATE(ext) |= kUpb_ExtMode_Extendable; } } else if (ch == kUpb_EncodedValue_End) { if (!d->table) { upb_MdDecoder_ErrorJmp(&d->base, "Extensions cannot have oneofs."); } ptr = upb_MtDecoder_DecodeOneofs(d, ptr); } else if (kUpb_EncodedValue_MinSkip <= ch && ch <= kUpb_EncodedValue_MaxSkip) { if (need_dense_below) { d->table->UPB_PRIVATE(dense_below) = d->table->UPB_PRIVATE(field_count); need_dense_below = false; } uint32_t skip; ptr = upb_MdDecoder_DecodeBase92Varint(&d->base, ptr, ch, kUpb_EncodedValue_MinSkip, kUpb_EncodedValue_MaxSkip, &skip); last_field_number += skip; last_field_number--; // Next field seen will increment. } else { upb_MdDecoder_ErrorJmp(&d->base, "Invalid char: %c", ch); } } if (need_dense_below) { d->table->UPB_PRIVATE(dense_below) = d->table->UPB_PRIVATE(field_count); } return ptr; } static void upb_MtDecoder_ParseMessage(upb_MtDecoder* d, const char* data, size_t len) { // Buffer length is an upper bound on the number of fields. We will return // what we don't use. d->fields = upb_Arena_Malloc(d->arena, sizeof(*d->fields) * len); upb_MdDecoder_CheckOutOfMemory(&d->base, d->fields); upb_SubCounts sub_counts = {0, 0}; d->table->UPB_PRIVATE(field_count) = 0; d->table->UPB_PRIVATE(fields) = d->fields; upb_MtDecoder_Parse(d, data, len, d->fields, sizeof(*d->fields), &d->table->UPB_PRIVATE(field_count), &sub_counts); upb_Arena_ShrinkLast(d->arena, d->fields, sizeof(*d->fields) * len, sizeof(*d->fields) * d->table->UPB_PRIVATE(field_count)); d->table->UPB_PRIVATE(fields) = d->fields; upb_MtDecoder_AllocateSubs(d, sub_counts); } int upb_MtDecoder_CompareFields(const void* _a, const void* _b) { const upb_LayoutItem* a = _a; const upb_LayoutItem* b = _b; // Currently we just sort by: // 1. rep (smallest fields first) // 2. type (oneof cases first) // 2. field_index (smallest numbers first) // The main goal of this is to reduce space lost to padding. // Later we may have more subtle reasons to prefer a different ordering. const int rep_bits = upb_Log2Ceiling(kUpb_FieldRep_Max); const int type_bits = upb_Log2Ceiling(kUpb_LayoutItemType_Max); const int idx_bits = (sizeof(a->field_index) * 8); UPB_ASSERT(idx_bits + rep_bits + type_bits < 32); #define UPB_COMBINE(rep, ty, idx) (((rep << type_bits) | ty) << idx_bits) | idx uint32_t a_packed = UPB_COMBINE(a->rep, a->type, a->field_index); uint32_t b_packed = UPB_COMBINE(b->rep, b->type, b->field_index); UPB_ASSERT(a_packed != b_packed); #undef UPB_COMBINE return a_packed < b_packed ? -1 : 1; } static bool upb_MtDecoder_SortLayoutItems(upb_MtDecoder* d) { // Add items for all non-oneof fields (oneofs were already added). int n = d->table->UPB_PRIVATE(field_count); for (int i = 0; i < n; i++) { upb_MiniTableField* f = &d->fields[i]; if (f->offset >= kOneofBase) continue; upb_LayoutItem item = {.field_index = i, .rep = f->UPB_PRIVATE(mode) >> kUpb_FieldRep_Shift, .type = kUpb_LayoutItemType_Field}; upb_MtDecoder_PushItem(d, item); } if (d->vec.size) { qsort(d->vec.data, d->vec.size, sizeof(*d->vec.data), upb_MtDecoder_CompareFields); } return true; } static size_t upb_MiniTable_DivideRoundUp(size_t n, size_t d) { return (n + d - 1) / d; } static void upb_MtDecoder_AssignHasbits(upb_MtDecoder* d) { upb_MiniTable* ret = d->table; int n = ret->UPB_PRIVATE(field_count); int last_hasbit = 0; // 0 cannot be used. // First assign required fields, which must have the lowest hasbits. for (int i = 0; i < n; i++) { upb_MiniTableField* field = (upb_MiniTableField*)&ret->UPB_PRIVATE(fields)[i]; if (field->offset == kRequiredPresence) { field->presence = ++last_hasbit; } else if (field->offset == kNoPresence) { field->presence = 0; } } if (last_hasbit > 63) { upb_MdDecoder_ErrorJmp(&d->base, "Too many required fields"); } ret->UPB_PRIVATE(required_count) = last_hasbit; // Next assign non-required hasbit fields. for (int i = 0; i < n; i++) { upb_MiniTableField* field = (upb_MiniTableField*)&ret->UPB_PRIVATE(fields)[i]; if (field->offset == kHasbitPresence) { field->presence = ++last_hasbit; } } ret->size = last_hasbit ? upb_MiniTable_DivideRoundUp(last_hasbit + 1, 8) : 0; } size_t upb_MtDecoder_Place(upb_MtDecoder* d, upb_FieldRep rep) { size_t size = upb_MtDecoder_SizeOfRep(rep, d->platform); size_t align = upb_MtDecoder_AlignOfRep(rep, d->platform); size_t ret = UPB_ALIGN_UP(d->table->size, align); static const size_t max = UINT16_MAX; size_t new_size = ret + size; if (new_size > max) { upb_MdDecoder_ErrorJmp( &d->base, "Message size exceeded maximum size of %zu bytes", max); } d->table->size = new_size; return ret; } static void upb_MtDecoder_AssignOffsets(upb_MtDecoder* d) { upb_LayoutItem* end = UPB_PTRADD(d->vec.data, d->vec.size); // Compute offsets. for (upb_LayoutItem* item = d->vec.data; item < end; item++) { item->offset = upb_MtDecoder_Place(d, item->rep); } // Assign oneof case offsets. We must do these first, since assigning // actual offsets will overwrite the links of the linked list. for (upb_LayoutItem* item = d->vec.data; item < end; item++) { if (item->type != kUpb_LayoutItemType_OneofCase) continue; upb_MiniTableField* f = &d->fields[item->field_index]; while (true) { f->presence = ~item->offset; if (f->offset == kUpb_LayoutItem_IndexSentinel) break; UPB_ASSERT(f->offset - kOneofBase < d->table->UPB_PRIVATE(field_count)); f = &d->fields[f->offset - kOneofBase]; } } // Assign offsets. for (upb_LayoutItem* item = d->vec.data; item < end; item++) { upb_MiniTableField* f = &d->fields[item->field_index]; switch (item->type) { case kUpb_LayoutItemType_OneofField: while (true) { uint16_t next_offset = f->offset; f->offset = item->offset; if (next_offset == kUpb_LayoutItem_IndexSentinel) break; f = &d->fields[next_offset - kOneofBase]; } break; case kUpb_LayoutItemType_Field: f->offset = item->offset; break; default: break; } } // The fasttable parser (supported on 64-bit only) depends on this being a // multiple of 8 in order to satisfy UPB_MALLOC_ALIGN, which is also 8. // // On 32-bit we could potentially make this smaller, but there is no // compelling reason to optimize this right now. d->table->size = UPB_ALIGN_UP(d->table->size, 8); } static void upb_MtDecoder_ValidateEntryField(upb_MtDecoder* d, const upb_MiniTableField* f, uint32_t expected_num) { const char* name = expected_num == 1 ? "key" : "val"; if (f->number != expected_num) { upb_MdDecoder_ErrorJmp(&d->base, "map %s did not have expected number (%d vs %d)", name, expected_num, (int)f->number); } if (!upb_MiniTableField_IsScalar(f)) { upb_MdDecoder_ErrorJmp( &d->base, "map %s cannot be repeated or map, or be in oneof", name); } uint32_t not_ok_types; if (expected_num == 1) { not_ok_types = (1 << kUpb_FieldType_Float) | (1 << kUpb_FieldType_Double) | (1 << kUpb_FieldType_Message) | (1 << kUpb_FieldType_Group) | (1 << kUpb_FieldType_Bytes) | (1 << kUpb_FieldType_Enum); } else { not_ok_types = 1 << kUpb_FieldType_Group; } if ((1 << upb_MiniTableField_Type(f)) & not_ok_types) { upb_MdDecoder_ErrorJmp(&d->base, "map %s cannot have type %d", name, (int)f->UPB_PRIVATE(descriptortype)); } } static void upb_MtDecoder_ParseMap(upb_MtDecoder* d, const char* data, size_t len) { upb_MtDecoder_ParseMessage(d, data, len); upb_MtDecoder_AssignHasbits(d); if (UPB_UNLIKELY(d->table->UPB_PRIVATE(field_count) != 2)) { upb_MdDecoder_ErrorJmp(&d->base, "%hu fields in map", d->table->UPB_PRIVATE(field_count)); UPB_UNREACHABLE(); } upb_LayoutItem* end = UPB_PTRADD(d->vec.data, d->vec.size); for (upb_LayoutItem* item = d->vec.data; item < end; item++) { if (item->type == kUpb_LayoutItemType_OneofCase) { upb_MdDecoder_ErrorJmp(&d->base, "Map entry cannot have oneof"); } } upb_MtDecoder_ValidateEntryField(d, &d->table->UPB_PRIVATE(fields)[0], 1); upb_MtDecoder_ValidateEntryField(d, &d->table->UPB_PRIVATE(fields)[1], 2); // Map entries have a pre-determined layout, regardless of types. // NOTE: sync with mini_table/message_internal.h. const size_t kv_size = d->platform == kUpb_MiniTablePlatform_32Bit ? 8 : 16; const size_t hasbit_size = 8; d->fields[0].offset = hasbit_size; d->fields[1].offset = hasbit_size + kv_size; d->table->size = UPB_ALIGN_UP(hasbit_size + kv_size + kv_size, 8); // Map entries have a special bit set to signal it's a map entry, used in // upb_MiniTable_SetSubMessage() below. d->table->UPB_PRIVATE(ext) |= kUpb_ExtMode_IsMapEntry; } static void upb_MtDecoder_ParseMessageSet(upb_MtDecoder* d, const char* data, size_t len) { if (len > 0) { upb_MdDecoder_ErrorJmp(&d->base, "Invalid message set encode length: %zu", len); } upb_MiniTable* ret = d->table; ret->size = 0; ret->UPB_PRIVATE(field_count) = 0; ret->UPB_PRIVATE(ext) = kUpb_ExtMode_IsMessageSet; ret->UPB_PRIVATE(dense_below) = 0; ret->UPB_PRIVATE(table_mask) = -1; ret->UPB_PRIVATE(required_count) = 0; } static upb_MiniTable* upb_MtDecoder_DoBuildMiniTableWithBuf( upb_MtDecoder* decoder, const char* data, size_t len, void** buf, size_t* buf_size) { upb_MdDecoder_CheckOutOfMemory(&decoder->base, decoder->table); decoder->table->size = 0; decoder->table->UPB_PRIVATE(field_count) = 0; decoder->table->UPB_PRIVATE(ext) = kUpb_ExtMode_NonExtendable; decoder->table->UPB_PRIVATE(dense_below) = 0; decoder->table->UPB_PRIVATE(table_mask) = -1; decoder->table->UPB_PRIVATE(required_count) = 0; // Strip off and verify the version tag. if (!len--) goto done; const char vers = *data++; switch (vers) { case kUpb_EncodedVersion_MapV1: upb_MtDecoder_ParseMap(decoder, data, len); break; case kUpb_EncodedVersion_MessageV1: upb_MtDecoder_ParseMessage(decoder, data, len); upb_MtDecoder_AssignHasbits(decoder); upb_MtDecoder_SortLayoutItems(decoder); upb_MtDecoder_AssignOffsets(decoder); break; case kUpb_EncodedVersion_MessageSetV1: upb_MtDecoder_ParseMessageSet(decoder, data, len); break; default: upb_MdDecoder_ErrorJmp(&decoder->base, "Invalid message version: %c", vers); } done: *buf = decoder->vec.data; *buf_size = decoder->vec.capacity * sizeof(*decoder->vec.data); return decoder->table; } static upb_MiniTable* upb_MtDecoder_BuildMiniTableWithBuf( upb_MtDecoder* const decoder, const char* const data, const size_t len, void** const buf, size_t* const buf_size) { if (UPB_SETJMP(decoder->base.err) != 0) { *buf = decoder->vec.data; *buf_size = decoder->vec.capacity * sizeof(*decoder->vec.data); return NULL; } return upb_MtDecoder_DoBuildMiniTableWithBuf(decoder, data, len, buf, buf_size); } upb_MiniTable* upb_MiniTable_BuildWithBuf(const char* data, size_t len, upb_MiniTablePlatform platform, upb_Arena* arena, void** buf, size_t* buf_size, upb_Status* status) { upb_MtDecoder decoder = { .base = {.status = status}, .platform = platform, .vec = { .data = *buf, .capacity = *buf_size / sizeof(*decoder.vec.data), .size = 0, }, .arena = arena, .table = upb_Arena_Malloc(arena, sizeof(*decoder.table)), }; return upb_MtDecoder_BuildMiniTableWithBuf(&decoder, data, len, buf, buf_size); } static const char* upb_MtDecoder_DoBuildMiniTableExtension( upb_MtDecoder* decoder, const char* data, size_t len, upb_MiniTableExtension* ext, const upb_MiniTable* extendee, upb_MiniTableSub sub) { // If the string is non-empty then it must begin with a version tag. if (len) { if (*data != kUpb_EncodedVersion_ExtensionV1) { upb_MdDecoder_ErrorJmp(&decoder->base, "Invalid ext version: %c", *data); } data++; len--; } uint16_t count = 0; upb_SubCounts sub_counts = {0, 0}; const char* ret = upb_MtDecoder_Parse(decoder, data, len, ext, sizeof(*ext), &count, &sub_counts); if (!ret || count != 1) return NULL; upb_MiniTableField* f = &ext->UPB_PRIVATE(field); f->UPB_PRIVATE(mode) |= kUpb_LabelFlags_IsExtension; f->offset = 0; f->presence = 0; if (extendee->UPB_PRIVATE(ext) & kUpb_ExtMode_IsMessageSet) { // Extensions of MessageSet must be messages. if (!upb_MiniTableField_IsSubMessage(f)) return NULL; // Extensions of MessageSet must be non-repeating. if (upb_MiniTableField_IsArray(f)) return NULL; } ext->UPB_PRIVATE(extendee) = extendee; ext->UPB_PRIVATE(sub) = sub; return ret; } static const char* upb_MtDecoder_BuildMiniTableExtension( upb_MtDecoder* const decoder, const char* const data, const size_t len, upb_MiniTableExtension* const ext, const upb_MiniTable* const extendee, const upb_MiniTableSub sub) { if (UPB_SETJMP(decoder->base.err) != 0) return NULL; return upb_MtDecoder_DoBuildMiniTableExtension(decoder, data, len, ext, extendee, sub); } const char* _upb_MiniTableExtension_Init(const char* data, size_t len, upb_MiniTableExtension* ext, const upb_MiniTable* extendee, upb_MiniTableSub sub, upb_MiniTablePlatform platform, upb_Status* status) { upb_MtDecoder decoder = { .base = {.status = status}, .arena = NULL, .table = NULL, .platform = platform, }; return upb_MtDecoder_BuildMiniTableExtension(&decoder, data, len, ext, extendee, sub); } upb_MiniTableExtension* _upb_MiniTableExtension_Build( const char* data, size_t len, const upb_MiniTable* extendee, upb_MiniTableSub sub, upb_MiniTablePlatform platform, upb_Arena* arena, upb_Status* status) { upb_MiniTableExtension* ext = upb_Arena_Malloc(arena, sizeof(upb_MiniTableExtension)); if (UPB_UNLIKELY(!ext)) return NULL; const char* ptr = _upb_MiniTableExtension_Init(data, len, ext, extendee, sub, platform, status); if (UPB_UNLIKELY(!ptr)) return NULL; return ext; } upb_MiniTable* _upb_MiniTable_Build(const char* data, size_t len, upb_MiniTablePlatform platform, upb_Arena* arena, upb_Status* status) { void* buf = NULL; size_t size = 0; upb_MiniTable* ret = upb_MiniTable_BuildWithBuf(data, len, platform, arena, &buf, &size, status); free(buf); return ret; }