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Port FlatBuffers to Rust (#4898)

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This is a port of FlatBuffers to Rust. It provides code generation and a
runtime library derived from the C++ implementation. It utilizes the
Rust type system to provide safe and fast traversal of FlatBuffers data.

There are 188 tests, including many fuzz tests of roundtrips for various
serialization scenarios. Initial benchmarks indicate that the canonical
example payload can be written in ~700ns, and traversed in ~100ns.

Rustaceans may be interested in the Follow, Push, and SafeSliceAccess
traits. These traits lift traversals, reads, writes, and slice accesses
into the type system, providing abstraction with no runtime penalty.
This commit is contained in:
Robert
2018-09-02 17:05:50 -07:00
committed by rw
parent e7578548a5
commit 3c54fd964b
46 changed files with 9998 additions and 61 deletions
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12
src/idl_parser.cpp
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@@ -30,7 +30,7 @@ const double kPi = 3.14159265358979323846;
const char *const kTypeNames[] = {
// clang-format off
#define FLATBUFFERS_TD(ENUM, IDLTYPE, \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, RTYPE) \
IDLTYPE,
FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
#undef FLATBUFFERS_TD
@@ -41,7 +41,7 @@ const char *const kTypeNames[] = {
const char kTypeSizes[] = {
// clang-format off
#define FLATBUFFERS_TD(ENUM, IDLTYPE, \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, RTYPE) \
sizeof(CTYPE),
FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
#undef FLATBUFFERS_TD
@@ -217,7 +217,7 @@ static std::string TokenToString(int t) {
FLATBUFFERS_GEN_TOKENS(FLATBUFFERS_TOKEN)
#undef FLATBUFFERS_TOKEN
#define FLATBUFFERS_TD(ENUM, IDLTYPE, \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, RTYPE) \
IDLTYPE,
FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
#undef FLATBUFFERS_TD
@@ -1077,7 +1077,7 @@ CheckedError Parser::ParseTable(const StructDef &struct_def, std::string *value,
switch (field_value.type.base_type) {
// clang-format off
#define FLATBUFFERS_TD(ENUM, IDLTYPE, \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, RTYPE) \
case BASE_TYPE_ ## ENUM: \
builder_.Pad(field->padding); \
if (struct_def.fixed) { \
@@ -1094,7 +1094,7 @@ CheckedError Parser::ParseTable(const StructDef &struct_def, std::string *value,
FLATBUFFERS_GEN_TYPES_SCALAR(FLATBUFFERS_TD);
#undef FLATBUFFERS_TD
#define FLATBUFFERS_TD(ENUM, IDLTYPE, \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, RTYPE) \
case BASE_TYPE_ ## ENUM: \
builder_.Pad(field->padding); \
if (IsStruct(field->value.type)) { \
@@ -1176,7 +1176,7 @@ CheckedError Parser::ParseVector(const Type &type, uoffset_t *ovalue) {
switch (val.type.base_type) {
// clang-format off
#define FLATBUFFERS_TD(ENUM, IDLTYPE, \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \
CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, RTYPE) \
case BASE_TYPE_ ## ENUM: \
if (IsStruct(val.type)) SerializeStruct(*val.type.struct_def, val); \
else { \