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Prefer pointer types in prefix operator parsing

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This fixes issue #49 in the simplest way. Before, if the
dereferenced variable was a byte type, the result of the word
pointer dereference operator, `*`, would be a byte type. This
caused `*@a` to return a byte if `a` was a byte type. Now the
pointer type is used instead, causing `*@a` to return a word.

Prefix operator parsing allows some nonsensical constructions,
like `@*x`, but these were already possible before.

Before the output from:
```
include "inc/cmdsys.plh"

byte a
byte b
word x

a = 5
b = 6
x = $55FF
puti(*@a) // 5
putln()
puti(*(@a)) // 1541
putln()
puti(@*a) // 5
putln()
puti(^@x) // 255
putln()
puti(^(@x)) // 255
putln()
puti(@^x) // 255
putln()
done
```
was:
```
5
1541
5
255
255
255
```
now it is:
```
1541
1541
1541
255
255
255
```
This commit is contained in:
Ian Flanigan 2018-11-18 12:02:23 +00:00
parent 4b03b371b6
commit ce0b92bf8c
2 changed files with 12 additions and 4 deletions
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8
src/toolsrc/parse.c
View File

@ -651,9 +651,13 @@ t_opseq *parse_value(t_opseq *codeseq, int rvalue, int *stackdepth)
cfnparms = 0; cfnvals = 1;
type &= ~FUNC_TYPE;
}
else if (type & (BYTE_TYPE | BPTR_TYPE))
else if (type & (BPTR_TYPE)) // Prefer the pointer type.
valseq = gen_lb(valseq);
else if (type & (WORD_TYPE | WPTR_TYPE))
else if (type & (WPTR_TYPE))
valseq = gen_lw(valseq);
else if (type & (BYTE_TYPE))
valseq = gen_lb(valseq);
else if (type & (WORD_TYPE))
valseq = gen_lw(valseq);
else
parse_error("What are we dereferencing?");

8
src/toolsrc/parse.pla
View File

@ -461,9 +461,13 @@ def parse_value(codeseq, r_val)#2
valseq = gen_op(valseq, ICAL_CODE)
stackdepth = stackdepth + cfnvals - 1
type = type & ~FUNC_TYPE
elsif type & (BYTE_TYPE | BPTR_TYPE)
elsif type & (BPTR_TYPE) // Prefer the pointer type.
valseq = gen_op(valseq, LB_CODE)
elsif type & (WORD_TYPE | WPTR_TYPE)
elsif type & (WPTR_TYPE)
valseq = gen_op(valseq, LW_CODE)
elsif type & (BYTE_TYPE)
valseq = gen_op(valseq, LB_CODE)
elsif type & (WORD_TYPE)
valseq = gen_op(valseq, LW_CODE)
else
exit_err(ERR_INVAL|ERR_CODE)