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parse: Refactor parse node encoding to support full range of small ints.

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Based on suggestion by @dpgeorge at
https://github.com/micropython/micropython/pull/313
This commit is contained in:
Paul Sokolovsky
2014-02-22 16:39:45 +02:00
parent bbf0e2fe12
commit 56e5ef203b
5 changed files with 84 additions and 46 deletions
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56
py/parse.h
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@@ -2,29 +2,30 @@ struct _mp_lexer_t;
// a mp_parse_node_t is:
// - 0000...0000: no node
// - xxxx...0001: an identifier; bits 4 and above are the qstr
// - xxxx...0011: a small integer; bits 4 and above are the signed value, 2's complement
// - xxxx...0101: an integer; bits 4 and above are the qstr holding the value
// - xxxx...0111: a decimal; bits 4 and above are the qstr holding the value
// - xxxx...1001: a string; bits 4 and above are the qstr holding the value
// - xxxx...1011: a string with triple quotes; bits 4 and above are the qstr holding the value
// - xxxx...1101: a token; bits 4 and above are mp_token_kind_t
// - xxxx...xxx0: pointer to mp_parse_node_struct_t
// - xxxx...xxx1: a small integer; bits 1 and above are the signed value, 2's complement
// - xxxx...xx00: pointer to mp_parse_node_struct_t
// - xx...x00010: an identifier; bits 5 and above are the qstr
// - xx...x00110: an integer; bits 5 and above are the qstr holding the value
// - xx...x01010: a decimal; bits 5 and above are the qstr holding the value
// - xx...x01110: a string; bits 5 and above are the qstr holding the value
// - xx...x10010: a string with triple quotes; bits 5 and above are the qstr holding the value
// - xx...x10110: a token; bits 5 and above are mp_token_kind_t
// makes sure the top 5 bits of x are all cleared (positive number) or all set (negavite number)
// TODO: these can now be unified with MP_OBJ_FITS_SMALL_INT(x)
// makes sure the top 2 bits of x are all cleared (positive number) or all set (negavite number)
// these macros can probably go somewhere else because they are used more than just in the parser
#define MP_UINT_HIGH_5_BITS (~((~((machine_uint_t)0)) >> 5))
#define MP_UINT_HIGH_2_BITS (~((~((machine_uint_t)0)) >> 2))
// parser's small ints are different from VM small int
#define MP_PARSE_FITS_SMALL_INT(x) (((((machine_uint_t)(x)) & MP_UINT_HIGH_5_BITS) == 0) || ((((machine_uint_t)(x)) & MP_UINT_HIGH_5_BITS) == MP_UINT_HIGH_5_BITS))
#define MP_PARSE_FITS_SMALL_INT(x) (((((machine_uint_t)(x)) & MP_UINT_HIGH_2_BITS) == 0) || ((((machine_uint_t)(x)) & MP_UINT_HIGH_2_BITS) == MP_UINT_HIGH_2_BITS))
#define MP_PARSE_NODE_NULL (0)
#define MP_PARSE_NODE_ID (0x1)
#define MP_PARSE_NODE_SMALL_INT (0x3)
#define MP_PARSE_NODE_INTEGER (0x5)
#define MP_PARSE_NODE_DECIMAL (0x7)
#define MP_PARSE_NODE_STRING (0x9)
#define MP_PARSE_NODE_BYTES (0xb)
#define MP_PARSE_NODE_TOKEN (0xd)
#define MP_PARSE_NODE_SMALL_INT (0x1)
#define MP_PARSE_NODE_ID (0x02)
#define MP_PARSE_NODE_INTEGER (0x06)
#define MP_PARSE_NODE_DECIMAL (0x0a)
#define MP_PARSE_NODE_STRING (0x0e)
#define MP_PARSE_NODE_BYTES (0x12)
#define MP_PARSE_NODE_TOKEN (0x16)
typedef machine_uint_t mp_parse_node_t; // must be pointer size
@@ -38,18 +39,19 @@ typedef struct _mp_parse_node_struct_t {
// some of these evaluate their argument more than once
#define MP_PARSE_NODE_IS_NULL(pn) ((pn) == MP_PARSE_NODE_NULL)
#define MP_PARSE_NODE_IS_LEAF(pn) ((pn) & 1)
#define MP_PARSE_NODE_IS_STRUCT(pn) ((pn) != MP_PARSE_NODE_NULL && ((pn) & 1) == 0)
#define MP_PARSE_NODE_IS_STRUCT_KIND(pn, k) ((pn) != MP_PARSE_NODE_NULL && ((pn) & 1) == 0 && MP_PARSE_NODE_STRUCT_KIND((mp_parse_node_struct_t*)(pn)) == (k))
#define MP_PARSE_NODE_IS_LEAF(pn) ((pn) & 3)
#define MP_PARSE_NODE_IS_STRUCT(pn) ((pn) != MP_PARSE_NODE_NULL && ((pn) & 3) == 0)
#define MP_PARSE_NODE_IS_STRUCT_KIND(pn, k) ((pn) != MP_PARSE_NODE_NULL && ((pn) & 3) == 0 && MP_PARSE_NODE_STRUCT_KIND((mp_parse_node_struct_t*)(pn)) == (k))
#define MP_PARSE_NODE_IS_ID(pn) (((pn) & 0xf) == MP_PARSE_NODE_ID)
#define MP_PARSE_NODE_IS_SMALL_INT(pn) (((pn) & 0xf) == MP_PARSE_NODE_SMALL_INT)
#define MP_PARSE_NODE_IS_TOKEN(pn) (((pn) & 0xf) == MP_PARSE_NODE_TOKEN)
#define MP_PARSE_NODE_IS_TOKEN_KIND(pn, k) ((pn) == (MP_PARSE_NODE_TOKEN | (k << 4)))
#define MP_PARSE_NODE_IS_SMALL_INT(pn) (((pn) & 0x1) == MP_PARSE_NODE_SMALL_INT)
#define MP_PARSE_NODE_IS_ID(pn) (((pn) & 0x1f) == MP_PARSE_NODE_ID)
#define MP_PARSE_NODE_IS_TOKEN(pn) (((pn) & 0x1f) == MP_PARSE_NODE_TOKEN)
#define MP_PARSE_NODE_IS_TOKEN_KIND(pn, k) ((pn) == (MP_PARSE_NODE_TOKEN | ((k) << 5)))
#define MP_PARSE_NODE_LEAF_KIND(pn) ((pn) & 0xf)
#define MP_PARSE_NODE_LEAF_KIND(pn) ((pn) & 0x1f)
// TODO should probably have int and uint versions of this macro
#define MP_PARSE_NODE_LEAF_ARG(pn) (((machine_int_t)(pn)) >> 4)
#define MP_PARSE_NODE_LEAF_ARG(pn) (((machine_uint_t)(pn)) >> 5)
#define MP_PARSE_NODE_LEAF_SMALL_INT(pn) (((machine_int_t)(pn)) >> 1)
#define MP_PARSE_NODE_STRUCT_KIND(pns) ((pns)->kind_num_nodes & 0xff)
#define MP_PARSE_NODE_STRUCT_NUM_NODES(pns) ((pns)->kind_num_nodes >> 8)