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Port FlatBuffers to Python.

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Implement code generation and self-contained runtime library for Python.

The test suite verifies:
  - Correctness of generated Python code by comparing output to that of
    the other language ports.
  - The exact bytes in the Builder buffer during many scenarios.
  - Vtable deduplication correctness.
  - Edge cases for table construction, via a fuzzer derived from the Go
    implementation.
  - All code is simultaneously valid in Python 2.6, 2.7, and 3.4.

The test suite includes benchmarks for:
  - Building 'gold' data.
  - Parsing 'gold' data.
  - Deduplicating vtables.

All tests pass on this author's system for the following Python
implementations:
  - CPython 2.6.7
  - CPython 2.7.8
  - CPython 3.4.2
  - PyPy 2.5.0 (CPython 2.7.8 compatible)
This commit is contained in:
rw
2014-12-16 00:32:11 -08:00
parent 4d213c2d06
commit 48dfc69ee6
35 changed files with 3608 additions and 35 deletions
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48
include/flatbuffers/idl.h
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@@ -35,24 +35,24 @@ namespace flatbuffers {
// Additionally, Parser::ParseType assumes bool..string is a contiguous range
// of type tokens.
#define FLATBUFFERS_GEN_TYPES_SCALAR(TD) \
TD(NONE, "", uint8_t, byte, byte, byte) \
TD(UTYPE, "", uint8_t, byte, byte, byte) /* begin scalar/int */ \
TD(BOOL, "bool", uint8_t, boolean,byte, bool) \
TD(CHAR, "byte", int8_t, byte, int8, sbyte) \
TD(UCHAR, "ubyte", uint8_t, byte, byte, byte) \
TD(SHORT, "short", int16_t, short, int16, short) \
TD(USHORT, "ushort", uint16_t, short, uint16, ushort) \
TD(INT, "int", int32_t, int, int32, int) \
TD(UINT, "uint", uint32_t, int, uint32, uint) \
TD(LONG, "long", int64_t, long, int64, long) \
TD(ULONG, "ulong", uint64_t, long, uint64, ulong) /* end int */ \
TD(FLOAT, "float", float, float, float32, float) /* begin float */ \
TD(DOUBLE, "double", double, double, float64, double) /* end float/scalar */
TD(NONE, "", uint8_t, byte, byte, byte, uint8) \
TD(UTYPE, "", uint8_t, byte, byte, byte, uint8) /* begin scalar/int */ \
TD(BOOL, "bool", uint8_t, boolean,byte, bool, bool) \
TD(CHAR, "byte", int8_t, byte, int8, sbyte, int8) \
TD(UCHAR, "ubyte", uint8_t, byte, byte, byte, uint8) \
TD(SHORT, "short", int16_t, short, int16, short, int16) \
TD(USHORT, "ushort", uint16_t, short, uint16, ushort, uint16) \
TD(INT, "int", int32_t, int, int32, int, int32) \
TD(UINT, "uint", uint32_t, int, uint32, uint, uint32) \
TD(LONG, "long", int64_t, long, int64, long, int64) \
TD(ULONG, "ulong", uint64_t, long, uint64, ulong, uint64) /* end int */ \
TD(FLOAT, "float", float, float, float32, float, float32) /* begin float */ \
TD(DOUBLE, "double", double, double, float64, double, float64) /* end float/scalar */
#define FLATBUFFERS_GEN_TYPES_POINTER(TD) \
TD(STRING, "string", Offset<void>, int, int, int) \
TD(VECTOR, "", Offset<void>, int, int, int) \
TD(STRUCT, "", Offset<void>, int, int, int) \
TD(UNION, "", Offset<void>, int, int, int)
TD(STRING, "string", Offset<void>, int, int, int, int) \
TD(VECTOR, "", Offset<void>, int, int, int, int) \
TD(STRUCT, "", Offset<void>, int, int, int, int) \
TD(UNION, "", Offset<void>, int, int, int, int)
// The fields are:
// - enum
@@ -61,12 +61,13 @@ namespace flatbuffers {
// - Java type.
// - Go type.
// - C# / .Net type.
// - Python type.
// using these macros, we can now write code dealing with types just once, e.g.
/*
switch (type) {
#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE) \
#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \
case BASE_TYPE_ ## ENUM: \
// do something specific to CTYPE here
FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
@@ -83,13 +84,13 @@ switch (type) {
__extension__ // Stop GCC complaining about trailing comma with -Wpendantic.
#endif
enum BaseType {
#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE) \
#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \
BASE_TYPE_ ## ENUM,
FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
#undef FLATBUFFERS_TD
};
#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE) \
#define FLATBUFFERS_TD(ENUM, IDLTYPE, CTYPE, JTYPE, GTYPE, NTYPE, PTYPE) \
static_assert(sizeof(CTYPE) <= sizeof(largest_scalar_t), \
"define largest_scalar_t as " #CTYPE);
FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
@@ -464,6 +465,13 @@ extern bool GenerateJava(const Parser &parser,
const std::string &file_name,
const GeneratorOptions &opts);
// Generate Python files from the definitions in the Parser object.
// See idl_gen_python.cpp.
extern bool GeneratePython(const Parser &parser,
const std::string &path,
const std::string &file_name,
const GeneratorOptions &opts);
// Generate C# files from the definitions in the Parser object.
// See idl_gen_csharp.cpp.
extern bool GenerateCSharp(const Parser &parser,