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Completed TODO: Rigid Endian

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Just used the endian.h functions to convert host endian to and from
big endian.
This commit is contained in:
Aryadev Chavali
2024-04-09 15:10:40 +06:30
parent 6df6dce153
commit afb48b65b9
2 changed files with 29 additions and 24 deletions
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17
lib/base.c
View File

@@ -10,30 +10,35 @@
* Description: Implementation of basic library functions
*/
#include <endian.h>
#include <string.h>
#include "./base.h"
hword convert_bytes_to_hword(byte *bytes)
{
hword h = 0;
memcpy(&h, bytes, HWORD_SIZE);
hword be_h = 0;
memcpy(&be_h, bytes, HWORD_SIZE);
hword h = be32toh(be_h);
return h;
}
void convert_hword_to_bytes(hword w, byte *bytes)
{
memcpy(bytes, &w, HWORD_SIZE);
hword be_h = htobe32(w);
memcpy(bytes, &be_h, HWORD_SIZE);
}
void convert_word_to_bytes(word w, byte *bytes)
{
memcpy(bytes, &w, WORD_SIZE);
word be_w = htobe64(w);
memcpy(bytes, &be_w, WORD_SIZE);
}
word convert_bytes_to_word(byte *bytes)
{
word w = 0;
memcpy(&w, bytes, WORD_SIZE);
word be_w = 0;
memcpy(&be_w, bytes, WORD_SIZE);
word w = be64toh(be_w);
return w;
}

36
todo.org
View File

@@ -15,24 +15,6 @@
*** TODO VM [0%]
**** TODO vm/runtime.h
** TODO Specification
* TODO Rigid endian :LIB:
Say a program is compiled on a little endian machine. The resultant
bytecode file, as a result of using C's internal functions, will use
little endian.
This file, when distributed to other computers, will not work on those
that use big endian.
This is a massive problem; I would like bytecode compiled on one
computer to work on any other one. Therefore we have to enforce big
endian. This refactor is limited to only LIB as a result of only the
~convert_*~ functions being used in the runtime to convert between
byte buffers (usually read from the bytecode file directly or from
memory to use in the stack).
2024-04-09: Found the ~hto_e~ functions under =endian.h= that provide
both way host to specific endian conversion of shorts, half words and
words. This will make it super simple to just convert.
* TODO Preprocessing directives :ASM:
Like in FASM or NASM where we can give certain helpful instructions to
the assembler. I'd use the ~%~ symbol to designate preprocessor
@@ -272,3 +254,21 @@ constant potentially
#+end_src
which when referred to (by ~$print-1~) would insert the bytecode given
inline.
** DONE Rigid endian :LIB:
Say a program is compiled on a little endian machine. The resultant
bytecode file, as a result of using C's internal functions, will use
little endian.
This file, when distributed to other computers, will not work on those
that use big endian.
This is a massive problem; I would like bytecode compiled on one
computer to work on any other one. Therefore we have to enforce big
endian. This refactor is limited to only LIB as a result of only the
~convert_*~ functions being used in the runtime to convert between
byte buffers (usually read from the bytecode file directly or from
memory to use in the stack).
2024-04-09: Found the ~hto_e~ functions under =endian.h= that provide
both way host to specific endian conversion of shorts, half words and
words. This will make it super simple to just convert.