T0b1/test-repo
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

decode: Use uint16_t for trie

Browse Source
This commit is contained in:
Alexis Engelke
2020-06-17 16:42:07 +02:00
parent 1fedc069b6
commit f4b41a7e80
2 changed files with 12 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
decode.c
View File

@@ -14,7 +14,7 @@
#define UNLIKELY(x) __builtin_expect((x), 0)
#define FD_DECODE_TABLE_DATA
static __attribute__((aligned(16))) const uint8_t _decode_table[] = {
static __attribute__((aligned(16))) const uint16_t _decode_table[] = {
#include <fadec-decode-table.inc>
};
#undef FD_DECODE_TABLE_DATA
@@ -44,7 +44,7 @@ typedef enum DecodeMode DecodeMode;
#define ENTRY_UNPACK(table,kind,entry) do { \
uint16_t entry_copy = entry; \
table = &((uint16_t*) _decode_table)[(entry_copy & ~7) >> 1]; \
table = &_decode_table[(entry_copy & ~7) >> 1]; \
kind = entry_copy & ENTRY_MASK; \
} while (0)
@@ -323,11 +323,11 @@ fd_decode(const uint8_t* buffer, size_t len_sz, int mode_int, uintptr_t address,
// Ensure that we can actually handle the decode request
#if defined(ARCH_386)
if (mode == DECODE_32)
table = &((uint16_t*) _decode_table)[FD_TABLE_OFFSET_32 >> 1];
table = &_decode_table[FD_TABLE_OFFSET_32];
#endif
#if defined(ARCH_X86_64)
if (mode == DECODE_64)
table = &((uint16_t*) _decode_table)[FD_TABLE_OFFSET_64 >> 1];
table = &_decode_table[FD_TABLE_OFFSET_64];
#endif
if (UNLIKELY(table == NULL))

15
parseinstrs.py
View File

@@ -336,12 +336,12 @@ class Table:
for name, entry in self.data.items():
self.annotations[current] = "%s(%d)" % (name, entry.kind.value)
self.offsets[name] = current
current += (2*entry.encode_length + 7) & ~7
if current >= 0x10000:
current += (entry.encode_length + 3) & ~3
if current >= 0x8000:
raise Exception("maximum table size exceeded: {:x}".format(current))
def encode_item(self, name):
return self.offsets[name] | self.data[name].kind.value
return (self.offsets[name] << 1) | self.data[name].kind.value
def compile(self):
self.calc_offsets()
@@ -349,7 +349,7 @@ class Table:
data = ()
for off, entry in ordered:
data += (0,) * (off//2 - len(data)) + entry.encode(self.encode_item)
data += (0,) * (off - len(data)) + entry.encode(self.encode_item)
data = struct.pack("<%dH"%len(data), *data)
@@ -358,12 +358,13 @@ class Table:
return data, self.annotations, [self.offsets[k] for k in self.roots]
def wrap(string):
return "\n".join(string[i:i+80] for i in range(0, len(string), 80))
return "\n".join(string[i:i+56] for i in range(0, len(string), 56))
def bytes_to_table(data, notes):
hexdata = ",".join("0x{:02x}".format(byte) for byte in data)
hexdata = ",".join("0x{:04x}".format(int.from_bytes(data[i:i+2], "little"))
for i in range(0, len(data), 2))
offs = [0] + sorted(notes.keys()) + [len(data)]
return "\n".join(wrap(hexdata[p*5:c*5]) + "\n//%04x "%c + notes.get(c, "")
return "\n".join(wrap(hexdata[p*7:c*7]) + "\n//%04x "%c + notes.get(c, "")
for p, c in zip(offs, offs[1:]))
template = """// Auto-generated file -- do not modify!