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Current work on preprocessor

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This commit is contained in:
Aryadev Chavali
2023-11-06 08:16:15 +00:00
parent 4ae6c05276
commit 6e524569c3
5 changed files with 86 additions and 41 deletions
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45
asm/lexer.c
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@@ -28,6 +28,8 @@ const char *token_type_as_cstr(token_type_t type)
return "PP_CONST";
case TOKEN_PP_END:
return "PP_END";
case TOKEN_PP_REFERENCE:
return "PP_REFERENCE";
case TOKEN_GLOBAL:
return "GLOBAL";
case TOKEN_STAR:
@@ -114,12 +116,12 @@ const char *lerr_as_cstr(lerr_t lerr)
{
switch (lerr)
{
case LERR_INVALID_CHAR_LITERAL:
return "INVALID_CHAR_LITERAL";
break;
case LERR_OK:
return "OK";
break;
case LERR_INVALID_CHAR_LITERAL:
return "INVALID_CHAR_LITERAL";
case LERR_INVALID_PREPROCESSOR_DIRECTIVE:
return "INVALID_PREPROCESSOR_DIRECTIVE";
}
return "";
}
@@ -150,7 +152,7 @@ bool is_valid_hex_char(char c)
(c >= 'A' && c <= 'F');
}
token_t tokenise_symbol(buffer_t *buffer, size_t *column)
lerr_t tokenise_symbol(buffer_t *buffer, size_t *column, token_t *token)
{
static_assert(NUMBER_OF_OPCODES == 98, "tokenise_buffer: Out of date!");
@@ -170,8 +172,25 @@ token_t tokenise_symbol(buffer_t *buffer, size_t *column)
if (sym_size > 1 && strncmp(opcode, "%", 1) == 0)
{
// Some kind of preprocessing directive
// TODO: Implement tokeniser for preprocessing directive
// Some preprocessing directive
if (sym_size > 6 && strncmp(opcode + 1, "CONST", 5) == 0)
{
type = TOKEN_PP_CONST;
offset = 6;
}
else if (sym_size == 4 && strncmp(opcode + 1, "END", 3) == 0)
{
type = TOKEN_PP_END;
offset = 4;
}
else
return LERR_INVALID_PREPROCESSOR_DIRECTIVE;
}
else if (sym_size > 1 && strncmp(opcode, "$", 1) == 0)
{
// A reference to a preprocessing constant
offset = 1;
type = TOKEN_PP_REFERENCE;
}
else if (sym_size == 4 && strncmp(opcode, "NOOP", 4) == 0)
{
@@ -384,7 +403,8 @@ token_t tokenise_symbol(buffer_t *buffer, size_t *column)
}
*column += sym_size - 1;
buffer->used += sym_size;
return ret;
*token = ret;
return LERR_OK;
}
token_t tokenise_number_literal(buffer_t *buffer, size_t *column)
@@ -494,7 +514,14 @@ lerr_t tokenise_buffer(buffer_t *buffer, token_stream_t *tokens_ptr)
is_valid_hex_char(buffer->data[buffer->used + 1]))
t = tokenise_hex_literal(buffer, &column);
else if (is_symbol(c))
t = tokenise_symbol(buffer, &column);
{
lerr_t lerr = tokenise_symbol(buffer, &column, &t);
if (lerr)
{
free(tokens.data);
return lerr;
}
}
else if (c == '\'')
{
if (space_left(buffer) < 2)