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0975d924938a3500380b22395b3262053f720ee2
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Author SHA1 Message Date
Aryadev Chavali
0975d92493 Introduced new instructions for comparison 
Comparing signed and unsigned versions of numbers.  Same for EQ as
well.

Notice the irregular pattern of BYTE, CHAR, INT, HWORD,LONG,WORD as
OPCODE_IS_TYPE requires the subcodes to be surrounded by BYTE and
WORD.
 2023-10-31 20:50:28 +00:00
Aryadev Chavali
7ca8f2c644 asm/main logs are now indented and look prettier 2023-10-31 20:39:49 +00:00
Aryadev Chavali
75dc36cd19 Lexer now returns errors on failure 
Currently only for invalid character literals, but still a possible
problem.
 2023-10-31 20:39:26 +00:00
Aryadev Chavali
fa640f13e8 parse_word deals with characters now 
Just takes the character literally as a number.
 2023-10-31 20:38:03 +00:00
Aryadev Chavali
228f548bd9 Changed asm/parser instruction push-reg->push.reg 2023-10-31 20:37:11 +00:00
Aryadev Chavali
c534a53b6f Make Verbose a universal flag 
All objects target LIB anyway, so VERBOSE is a universal macro for
this code base.
 2023-10-29 16:59:37 +00:00
Aryadev Chavali
157c79d53c Added a "usage" message and colours for assembler 
Prints useful and pretty messages when verbose being at least 1.
 2023-10-29 16:59:31 +00:00
Aryadev Chavali
597a45aa73 Fixed bug where JUMP_REGISTER couldn't be in bytecode read 2023-10-29 16:58:18 +00:00
Aryadev Chavali
c4cb45f3ad Fixed bug where reading operand bytecode may stop prematurely 
This is due to checking for equality instead of just greater than in
darr->used against darr->available.
 2023-10-29 16:56:33 +00:00
Aryadev Chavali
7c367f95c9 Added some examples to instruction-test for positive/negative literals 
Use the push.* instructions to see this.
 2023-10-29 16:56:19 +00:00
Aryadev Chavali
025b26b877 Introduced an example source file for all instructions 
Provides calling conventions, ensures parser and lexer are working
correctly.  Will be updated as more instructions are introduced and
supported in the assembler.
 2023-10-29 16:56:19 +00:00
Aryadev Chavali
1177a5a45b Auto-fill copyright notice in examples/fib.c 2023-10-29 16:56:19 +00:00
Aryadev Chavali
1c0bd20cba Introduce error reporting in asm/main 
Pretty simple implementation, I've stopped printing the tokens cos I
think the lexer is done.
 2023-10-28 18:22:18 +01:00
Aryadev Chavali
eac8cbf1da asm/parser supports all opcodes, introduced parse errors 
Introduced some functions to parse differing types of opcodes.  Use
the same style of a.b.c... for namespacing or type specification for
certain opcodes.  Bit hacky and not tested, but does work.

Parse errors can be reported with an exact location using the token
column, line.
 2023-10-28 18:21:09 +01:00
Aryadev Chavali
191fe5c6b8 Ignore comments (using semicolons) in lexer 
Easier to do it here than at the parser.
 2023-10-28 18:19:33 +01:00
Aryadev Chavali
d2429aa549 Introduced a column and line for each token 
Accurate error reporting can be introduced using this.
 2023-10-28 18:19:30 +01:00
Aryadev Chavali
32dfcc109c Added macro to do safe subtractions on a word 
Default C just lets overflows occur for subtraction, so this macro
will default to 0 if the subtraction causes an overflow.
 2023-10-28 18:16:50 +01:00
Aryadev Chavali
fc81cda96b Plugged in asm/parser to asm/main 
Just prints instructions so far.
 2023-10-26 11:18:07 +01:00
Aryadev Chavali
2fe2af22a9 Implemented a rudimentary parser with support for 4 instruction types 2023-10-26 11:17:55 +01:00
Aryadev Chavali
dca51106a2 Added support in lexer for negative numbers 
Though we deal with unsigned numbers internally, it should be possible
to read and manipulate negative numbers through 2s complement.  Later
on we'll add support for signed operations via 2s complement, so this
should be allowed.
 2023-10-26 11:17:01 +01:00
Aryadev Chavali
e9c54e045a Fixed bug where printing hword of an instruction prints number not hex 
This is an easy fix.
 2023-10-26 11:16:02 +01:00
Aryadev Chavali
c70a9d9879 asm/main now uses TOKEN_STREAM_AT 2023-10-26 10:23:00 +01:00
Aryadev Chavali
b152365561 Lexer forces uppercase for symbols 2023-10-26 10:22:53 +01:00
Aryadev Chavali
3200e97324 Updated README for targeting VM 2023-10-26 10:22:26 +01:00
Aryadev Chavali
d1f84a6a2c Makefile now prints dependencies on successful compilation 2023-10-26 10:22:10 +01:00
Aryadev Chavali
74a85268c4 Moved base functions from inst.c to dedicated file 
Doesn't make sense for them to be in the VM module when they have a
more general purpose now.
 2023-10-26 10:19:10 +01:00
Aryadev Chavali
c8c5381cf2 vm/main takes a filename as input to execute bytecode 
Also prints a usage for incorrect usage.
 2023-10-26 10:18:53 +01:00
Aryadev Chavali
a07b571da2 Auto fill licenses 2023-10-26 08:01:26 +01:00
Aryadev Chavali
7bf6b53230 Unified literal for numbers, main program now tokenises 2023-10-26 07:15:52 +01:00
Aryadev Chavali
131d70a9a3 Started working on a parser 
No implementations yet
 2023-10-25 21:43:51 +01:00
Aryadev Chavali
94abb9e3d4 Separated lexer from main file in asm 2023-10-25 21:43:13 +01:00
Aryadev Chavali
dbbfac1236 Wrote lexer for assembly 
Pretty simple tokeniser, doesn't do a lot and needs to error check better.
 2023-10-24 18:20:59 +01:00
Aryadev Chavali
3aad3926d2 Removed assertion in darr_read_file 
If an empty file is read, we want to deal with it in later user code
rather than just failing immediately.
 2023-10-24 18:20:22 +01:00
Aryadev Chavali
92855ebb3e Starting development on assembly language 2023-10-23 16:53:50 +01:00
Aryadev Chavali
42ac28d44a Make root directory an include path, set #include's properly 
Easier to write includes now just using < with the module name, in
comparison to using relative paths.
 2023-10-23 04:46:09 +01:00
Aryadev Chavali
0ac634a9be Reintroduced example fib.c via examples/ folder 2023-10-23 04:25:48 +01:00
Aryadev Chavali
ac57e32a02 Added lib folder for general stuff, introduced as target to Makefile 2023-10-23 04:25:48 +01:00
Aryadev Chavali
aa4a3b8614 Implemented simple example of a for loop in main 2023-10-23 03:59:34 +01:00
Aryadev Chavali
b44a61be41 src->vm, Makefile is now a bit more abstracted and pretty colours 
Changed folder names for sake of clarity (will be introducing a new
build target soon), and Makefile can now easily support more targets.
 2023-10-23 03:58:34 +01:00
Aryadev Chavali
587f31a63b Remove unnecessary log message 2023-10-23 03:11:05 +01:00
Aryadev Chavali
9496da9d93 Added and implemented OP_JUMP_IF_* 
Performs a jump when the (BYTE|HWORD|WORD) at the top of the stack is
non zero.
 2023-10-23 01:45:54 +01:00
Aryadev Chavali
b93a4af495 Extracted code that performs a jump into its own routine 
Checks if the operand given is a well defined program address, then
performs the jump.
 2023-10-23 01:45:18 +01:00
Aryadev Chavali
2ef104f235 Fixed bug in vm_mov(byte|hword) where registers aren't set properly 
This is because we just OR the bits into the specific byte of the
word.  This means the previous state may leave artefacts as the OR
doesn't clear the bits away.

To do so, we apply a bit mask to clear the specified byte(s) of the
word, then perform the OR.
 2023-10-23 01:43:24 +01:00
Aryadev Chavali
20030e364c Moved macros to extract nth (byte|hword) from a word to base.h 2023-10-23 00:53:44 +01:00
Aryadev Chavali
00f3b3bf21 Rearrange what is printed in vm_print_all 
First the program, then the registers then the stack.
 2023-10-23 00:49:59 +01:00
Aryadev Chavali
d0ee1f3b1f Check for and handle errors when interpreting bytecode 
Prints an error message, returns a non zero code based on error
code (255 - err).

In main, I propagate this exit code.
 2023-10-23 00:48:18 +01:00
Aryadev Chavali
919fae2df8 Added an example program fib.c 
This is simply a program with an embedded set of instructions which
indefinitely computes and prints fibonacci numbers, computing them in
pairs.

Does it completely through the virtual machine rather than just hard C
instructions.

Also amended the Makefile to compile it.  Required moving the main.c
object file into the dependencies of $(DIST)/$(OUT).

I should track the dependencies for fib.c and main.c as well.
 2023-10-23 00:45:23 +01:00
Aryadev Chavali
19eb401498 Fixed bugs with ordering of bytes in some operations 
Also fixed an overflow error in vm_dup_word, where I underflow the
index of vm->stack.data which causes a buffer overflow.
 2023-10-23 00:28:39 +01:00
Aryadev Chavali
ae9bc91713 Added and implemented OP_PRINT* 
Here is where we may have differing interpretations of what the bits
in the data pile may actually mean.  This in particular refers to
printing the signed or unsigned versions of the bits given.  Also,
interpreting some byte as a character or just a raw number.
 2023-10-23 00:09:12 +01:00
Aryadev Chavali
45ad8f7296 Fixed bug where vm_print_program listing for program was incorrect 
Only happens when vm_print_program(STDERR), as STDERR occurs before
STDOUT on Emacs.  So while the lines would print, no instructions
would follow.  This fixes that by using fp.
 2023-10-23 00:08:53 +01:00