mirror of https://github.com/RevCurtisP/C02.git
Added logical operators 'and' and 'or' to conditionals
This commit is contained in:
Curtis F Kaylor
parent
f35762abda
commit
fb9f396240
64
doc/c02.txt
64
doc/c02.txt
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@ -420,10 +420,10 @@ Accumulator. However, due to the 6502 having only one Accumulatorm which
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is used for all operations between two bytes, there is no simple system
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agnostic method for allowing function calls in subsequent terms.
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EVALUATIONS
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CONTENTIONS
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An evaluation is a construct which generates either TRUE or FALSE condition.
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It may be an expression, a comparison, or a test.
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An contention is a construct which generates either TRUE or FALSE condition,
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and may be an expressions, comparisons, or test.
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A stand-alone expression evaluates to TRUE if the result is non-zero, or
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FALSE if the result is zero.
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@ -455,8 +455,8 @@ a positive value upon succesful completion and a negative value if an error
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was encounters. They compile into smaller code than would be generated
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using the equivalent comparison operators.
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A comparison may be preceded by negation operator (a ! character), which
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reverses the meaning of the entire comparison. For example,
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An contention may be preceded by negation operator (the ! character), which
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reverses the result of the entire contention. For example:
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! expr
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evaluates to TRUE if expr is zero, or FALSE if it is non-zero; while
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! expr = term
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@ -464,7 +464,7 @@ evaluates to TRUE if expr and term are not equal, or FALSE if they are; and
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! expr :+
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evaluates to TRUE if expr is negative, or FALSE if it is positive
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Note: Evaluations are compiled directly into 6502 conditional branch
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Note: Contentions are compiled directly into 6502 conditional branch
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instructions, which precludes their use inside expressions. Standalone
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expressions and test-ops generate a single branch instruction, and
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therefore result in the most efficient code. Comparisons generate a
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@ -473,6 +473,29 @@ generate one, while <= and > generate two). A preceding negation operator
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will switch the number of branch instructions used in a comparison, but
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otherwise does not change the size of the generated code.
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CONDITIONALS
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A conditional consists of one or more contentions joined with the
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conjunctors "and" and "or".
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If only one contention is present, the result of the conditional is the
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same as the result of the contention.
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If two contentions are joined with "and", then the conditional is true only
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if both of the contentions are true. If either or both of the contentions
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are false, then the conditional is false.
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If two contentions are joined with "or", then the conditional is true if
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either or both of the contentions are true. If both of the contentions are
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false, then the conditional is false.
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When more three or more contentions are chained together, the conjunctors
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are evaluated in left to right order, using short-circuit evaluation. If
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the contention to the left of an "and" is false, then the entire conditional
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evaluates to false, and if the contention to the left of an "or" is true,
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then the entire conditional evaluates to true. In either case, no further
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contentions in the conditional are evaluated.
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ARRAY SUBSCRIPTS
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Individual elements of an array are accessed using subscript notation.
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@ -665,9 +688,9 @@ Examples:
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SHORTCUT-IFS
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A shortcut-if is a special form of assignment consisting of an evaluation
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A shortcut-if is a special form of assignment consisting of an contention
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and two expressions, of which one will be assigned based on the result
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of the evaluation. A shortcut-if is written as a condition surrounded
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of the contention. A shortcut-if is written as a condition surrounded
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by ( and ) characters, followed by a ? character, the expression to be
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evaluated if the condition was true, a : character, and the expression to
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be evaluated if the condition was false.
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@ -757,12 +780,13 @@ IF AND ELSE STATEMENTS
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The if then and else statements are used to conditionally execute blocks
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of code.
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When using the if keyword, it is followed by an evaluation (surrounded by
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parenthesis) and the block of code to be executed if the evaluation was true.
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When using the if keyword, it is followed by a conditional (surrounded by
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parenthesis) and the block of code to be executed if the conditional was
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true.
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An else statement may directly follow an if statement (with no other
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executable code intervening). The else keyword is followed by the block
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of code to be executed if the evaluation was false.
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of code to be executed if the conditional was false.
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Examples:
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if (c = 27) goto end;
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@ -850,13 +874,13 @@ select expression will be executed.
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WHILE LOOPS
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The while statement is used to conditionally execute code in a loop. When
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using the while keyword, it is followed by an evaluation (surrounded by
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parenthesis) and the the block of code to be executed while the evaluation
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is true. If the evaluation is false when the while statement is entered,
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using the while keyword, it is followed by a conditional (surrounded by
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parenthesis) and the the block of code to be executed while the conditional
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is true. If the conditional is false when the while statement is entered,
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the code in the block will never be executed.
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Alternatively, the while keyword may be followed by a pair of empty
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parenthesis, in which case an evaluation of true is implied.
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parenthesis, in which case a conditional of true is implied.
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Examples:
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c = 'A' ; while (c <= 'Z') {putc(c); c++;} //Print letters A-Z
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@ -869,10 +893,10 @@ DO WHILE LOOPS
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The do statement used with to conditionally execute code in a loop at
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least once. When using the do keyword, it is followed by the block of
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code to be executed, a while statement, an evaluation (surrounded
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code to be executed, a while statement, a conditional (surrounded
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by parenthesis), and a terminating semicolon.
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A while statement that follows a do loop must contain an evaluation.
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A while statement that follows a do loop must contain a conditional.
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The while statement is evaluated after each iteration of the loop, and
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if it is true, the code block is repeated.
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@ -893,7 +917,7 @@ a set of values.
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When using the if keyword, it is followed by a pair of parenthesis
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containing an initialization assignment statement (which is executed once),
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a semicolon separator, an evaluation (which determines if the code block
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a semicolon separator, a conditional (which determines if the code block
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is executed), another semicolon separator, and an increment assignment
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(which is executed after each iteration of the code block). This is then
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followed by the block of code to be conditionally executed.
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@ -926,8 +950,8 @@ break keyword, it is followed with a trailing semicolon.
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When a continue statement is encountered, program execution is transferred
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to the beginning of the block associated with the innermost do, for, or
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while statement. In the case of a for statement, the increment assignment
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is executed, followed by the evaluation, and in the case of a while
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statement, the evaluation is executed. When using the continue keyword, it
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is executed, followed by the conditional, and in the case of a while
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statement, the conditional is executed. When using the continue keyword, it
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is followed with a trailing semicolon.
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Examples:
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@ -78,6 +78,22 @@ a function call as the first term).
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The sizeof operator in C02 is the at sign @. It may only be used with
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declared variables and struct members, not types.
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CONDITIONALS
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Conditional operations, including comparisons and logical operators,
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may not be used within or in place of normal expressions, and are only
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allowed in if, while, and for statements, as well as shortcut-ifs.
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The comparison operators are ==, <, <=, >=, >, and <>. Unlike standard
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C, the not-equals operator is <> instead of !=. In addition, = may be
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substituted for ==. The logical not operator ! negates an entire
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comparison rather than an individual term within the comparison, thus
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the C02 code !b<x is equivalent to the C code !(b<x).
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C02 uses the logical operators "and" and "or" instead of "&&" and "||",
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and performs short-circuit evaluation of logical operators, making them
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effectively right associative.
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FUNCTIONS
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Parameter passing uses the 6502's A, Y, and X registers. This limits
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@ -3,16 +3,86 @@
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****************************************/
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#include <py65.h02>
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#include <stddef.h02>
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#include <stdlib.h02>
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#include <stdio.h02>
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#include <stdiox.h02>
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#include <test.h02>
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char true = $FF;
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char false = $00;
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char pass = " Passed";
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char fail = " Failed";
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char n0=0, n1=1, n2=2, nff=255;
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char r,s; //Result & Summary
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main:
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puts("if (true): "); if (true) putln(&pass); else putln(&fail);
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puts("if (false): "); if (false) putln(&fail); else putln(&pass);
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puts( "if (#TRUE): "); if (#TRUE) passed(); else failed();
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puts("; if (#FALSE):"); if (#FALSE) failln(); else passln();
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newlin();
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puts( "if (#TRUE and #TRUE ):"); if (#TRUE and #TRUE) passed(); else failed();
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puts("; if (#TRUE and #FALSE):"); if (#TRUE and #FALSE) failln(); else passln();
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puts( "if (#FALSE and #TRUE ):"); if (#FALSE and #TRUE) failed(); else passed();
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puts("; if (#FALSE and #FALSE):"); if (#FALSE and #FALSE) failln(); else passln();
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newlin();
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puts( "if (#TRUE or #TRUE) :"); if (#TRUE or #TRUE) passed(); else failed();
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puts("; if (#TRUE or #FALSE):"); if (#TRUE or #FALSE) passln(); else failln();
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puts( "if (#FALSE or #TRUE) :"); if (#FALSE or #TRUE) passed(); else failed();
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puts("; if (#FALSE or #FALSE):"); if (#FALSE or #FALSE) failln(); else passln();
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newlin();
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puts( "if (#TRUE and #TRUE and #TRUE) :"); if (#TRUE and #TRUE and #TRUE) passed(); else failed();
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puts("; if (#TRUE and #TRUE and #FALSE):"); if (#TRUE and #TRUE and #FALSE) failln(); else passln();
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puts( "if (#TRUE and #FALSE and #TRUE) :"); if (#TRUE and #FALSE and #TRUE) failed(); else passed();
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puts("; if (#TRUE and #FALSE and #FALSE):"); if (#TRUE and #FALSE and #FALSE) failln(); else passln();
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puts( "if (#FALSE and #TRUE and #TRUE) :"); if (#FALSE and #TRUE and #TRUE) failed(); else passed();
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puts("; if (#FALSE and #TRUE and #FALSE):"); if (#FALSE and #TRUE and #FALSE) failln(); else passln();
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puts( "if (#FALSE and #FALSE and #TRUE) :"); if (#FALSE and #FALSE and #TRUE) failed(); else passed();
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puts("; if (#FALSE and #FALSE and #FALSE):"); if (#FALSE and #FALSE and #FALSE) failln(); else passln();
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newlin();
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puts( "if (#TRUE or #TRUE or #TRUE) :"); if (#TRUE or #TRUE or #TRUE) passed(); else failed();
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puts("; if (#TRUE or #TRUE or #FALSE):"); if (#TRUE or #TRUE or #FALSE) passln(); else failln();
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puts( "if (#TRUE or #FALSE or #TRUE) :"); if (#TRUE or #FALSE or #TRUE) passed(); else failed();
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puts("; if (#TRUE or #FALSE or #FALSE):"); if (#TRUE or #FALSE or #FALSE) passln(); else failln();
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puts( "if (#FALSE or #TRUE or #TRUE) :"); if (#FALSE or #TRUE or #TRUE) passed(); else failed();
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puts("; if (#FALSE or #TRUE or #FALSE):"); if (#FALSE or #TRUE or #FALSE) passln(); else failln();
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puts( "if (#FALSE or #FALSE or #TRUE) :"); if (#FALSE or #FALSE or #TRUE) passed(); else failed();
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puts("; if (#FALSE or #FALSE or #FALSE):"); if (#FALSE or #FALSE or #FALSE) failln(); else passln();
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anykey();
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puts( "if (n0<n1): "); if (n0<n1) passed(); else failed();
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puts("; if (n2>n1): "); if (n2>n1) passln(); else failln();
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puts( "if (n1==n1):"); if (n1==n1) passed(); else failed();
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puts("; if (n0<>n2):"); if (n0<>n2) passln(); else failln();
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newlin();
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puts( "if (n0<n1): "); if (n0<n1) passed(); else failed();
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puts("; if (n1<n2): "); if (n1<n2) passed(); else failed();
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puts("; if (n0<n2): "); if (n1<n2) passln(); else failln();
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puts( "if (n1<=n1):"); if (n1<=n1) passed(); else failed();
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puts("; if (n1<=n2):"); if (n1<=n2) passed(); else failed();
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puts("; if (n1<n2): "); if (n1<=n2) passln(); else failln();
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puts( "if (n1>=n1):"); if (n2>=n1) passed(); else failed();
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puts("; if (n2>=n1):"); if (n2>=n1) passed(); else failed();
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puts("; if (n2>n1): "); if (n2>n1) passln(); else failln();
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newlin();
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puts( "if (n0): "); if (n0) failed(); else passed();
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puts("; if (n1): "); if (n1) passed(); else failed();
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puts("; if (n2): "); if (n1) passed(); else failed();
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puts("; if (nff): "); if (nff) passln(); else failln();
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puts( "if (n0:+): "); if (n0:+) passed(); else failed();
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puts("; if (n1:+): "); if (n1:+) passed(); else failed();
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puts("; if (n2:+): "); if (n1:+) passed(); else failed();
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puts("; if (nff:+):"); if (nff:+) failln(); else passln();
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puts( "if (n0:-): "); if (n0:-) failed(); else passed();
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puts("; if (n1:-): "); if (n1:-) failed(); else passed();
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puts("; if (n2:-): "); if (n1:-) failed(); else passed();
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puts("; if (nff:-):"); if (nff:-) passln(); else failln();
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newlin();
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goto exit;
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@ -27,6 +27,7 @@
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/* Initilize Compiler Variables */
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void init(void) {
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initim(); //Initialize Elapsed Time
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DEBUG("Initializing Compiler Variables\n",0)
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concnt = 0; //Number of Constants Defined
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varcnt = 0; //Number of Variables in Table
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17
src/common.c
17
src/common.c
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@ -7,9 +7,11 @@
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#include <ctype.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#include "common.h"
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struct timespec curtim; //Current Time
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/* Error - Print Input File name & position and exit */
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void exterr(int errnum) {
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fprintf(stderr, "Line %d Column %d of File %s\n", curlin, curcol, inpnam);
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@ -27,6 +29,19 @@ void expctd(char *expstr) {
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/* Print current position in file */
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void prtpos(void) { printf("(%s: %d,%d) ", inpnam, curlin, curcol); }
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/* Initialize elapsed time counter */
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void initim(void) {
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timespec_get (&curtim, TIME_UTC);
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bgntim = curtim.tv_sec;
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}
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/* Print elapsed time */
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void prttim(void) {
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timespec_get (&curtim, TIME_UTC);
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printf("[%d", curtim.tv_sec - bgntim);
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printf(".%06d]",curtim.tv_nsec/1000);
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}
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/* Set comment to string */
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void setcmt(char *s) { strcpy(cmtasm, s); }
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@ -36,8 +36,10 @@
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#define TRUE -1
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#define FALSE 0
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void prtpos(); //Print current file name and position
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#define DEBUG(fmt, val) {if (debug) {prtpos(); printf(fmt, val);}}
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void initim(); //Initialize elapsed time counter
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void prtpos(); //Print current file name and position
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void prttim(); //Print elapsed time
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#define DEBUG(fmt, val) {if (debug) {prtpos(); prttim(); printf(fmt, val);}}
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#define DETAIL(fmt, val) {if (debug) printf(fmt, val);}
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#define ERROR(fmt, val, err) {fprintf(stderr, fmt, val);exterr(err);}
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@ -49,6 +51,8 @@ char asmcmt[LINELEN]; //Processed Assembly Language Comment
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int curcol, curlin; //Position in Source Code
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int savcol, savlin; //Save Position in Source Code
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int bgntim; //Starting Time
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int nxtchr; //Next Character of Source File to Process
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int nxtupc; //Next Character Converted to Uppercase
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int savchr; //Holds nxtchr when switching input files
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79
src/cond.c
79
src/cond.c
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@ -39,24 +39,31 @@ int enccmp(char c) {
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* Uses: term - Term Being Compared Against *
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* label - Branch Target if Comparison is FALSE */
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void prccmp(void) {
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DEBUG("Processing comparator %d\n", cmprtr)
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DEBUG("Processing comparator %d", cmprtr) DETAIL(" with REVCMP=%d\n", revcmp)
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if (cmprtr > 7) { //Process Flag
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cmprtr = (cmprtr ^ revcmp) & 1; //Apply Reversal
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if (cmprtr) asmlin("BPL", cmplbl);
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else asmlin("BMI", cmplbl);
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return;
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}
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cmprtr = (cmprtr ^ revcmp) & 7; //Apply reversal
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switch(cmprtr) {
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case 0: // Raw Expression (Skip)
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asmlin("BEQ", cndlbl); break;
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asmlin("BEQ", cmplbl); break;
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case 1: // = or ==
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asmlin("CMP", term); asmlin("BNE", cndlbl); break;
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asmlin("CMP", term); asmlin("BNE", cmplbl); break;
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case 2: // <
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asmlin("CMP", term); asmlin("BCS", cndlbl); break;
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asmlin("CMP", term); asmlin("BCS", cmplbl); break;
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case 3: // <= or =<
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asmlin("CLC", ""); asmlin("SBC", term); asmlin("BCS", cndlbl); break;
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asmlin("CLC", ""); asmlin("SBC", term); asmlin("BCS", cmplbl); break;
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case 4: // >
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asmlin("CLC", ""); asmlin("SBC", term); asmlin("BCC", cndlbl); break;
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asmlin("CLC", ""); asmlin("SBC", term); asmlin("BCC", cmplbl); break;
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case 5: // >= or =>
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asmlin("CMP", term); asmlin("BCC", cndlbl); break;
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asmlin("CMP", term); asmlin("BCC", cmplbl); break;
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case 6: // <> or ><
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asmlin("CMP", term); asmlin("BEQ", cndlbl); break;
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asmlin("CMP", term); asmlin("BEQ", cmplbl); break;
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case 7: // Raw Expression (Normal)
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asmlin("BNE", cndlbl); break;
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asmlin("BNE", cmplbl); break;
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default:
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ERROR("Unsupported comparison operator index %d\n", cmprtr, EXIT_FAILURE)
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}
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@ -73,33 +80,59 @@ void prscmp(int revrse) {
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}
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skpspc();
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if (cmprtr) prstrm();
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cmprtr = (cmprtr ^ revrse) & 7; //Apply reversal
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prccmp();
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//prccmp(); - Do after check for logical operator
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DEBUG("Parsed comparator %d\n", cmprtr)
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}
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|
||||
/* Parse Flag Operator */
|
||||
void prsflg(int revrse) {
|
||||
DEBUG("Parsing Flag Operator '%c'\n", nxtchr)
|
||||
if (match('+')) cmprtr = 0;
|
||||
else if (match('-')) cmprtr = 1;
|
||||
if (match('+')) cmprtr = 8; //Bit 0 = 0
|
||||
else if (match('-')) cmprtr = 9; //Bit 1 = 1
|
||||
else expctd("Flag operator");
|
||||
skpchr();
|
||||
cmprtr = (cmprtr ^ revrse) & 1; //Apply Reversal
|
||||
if (cmprtr) asmlin("BPL", cndlbl);
|
||||
else asmlin("BMI", cndlbl);
|
||||
}
|
||||
|
||||
/* Parse Logical Operator *
|
||||
* Sets: logops */
|
||||
void prslop(void) {
|
||||
DEBUG("Checking for Logical Operator\n", 0)
|
||||
logopr = LOPNONE;
|
||||
skpspc();
|
||||
if (isalph()) {
|
||||
getwrd(); //Get Logical Operator
|
||||
DEBUG("Parsing Logical Operator %s\n", word)
|
||||
if (wordis("AND")) logopr = LOPAND;
|
||||
else if (wordis("OR")) logopr = LOPOR;
|
||||
else ERROR("Encountered invalid token \"%s\"\n", word, EXIT_FAILURE)
|
||||
}
|
||||
DEBUG("Set LOGOPR to %d\n", logopr)
|
||||
}
|
||||
|
||||
/* Parse and Compile Conditional Expression *
|
||||
* Condition = <expression> <comparator> <term> */
|
||||
void prscnd(char trmntr, int revrse) {
|
||||
DEBUG("Parsing condition with REVRSE=%d\n", revrse)
|
||||
if (look('!')) {
|
||||
revrse = (revrse) ? FALSE: TRUE;
|
||||
DEBUG("Set REVRSE to %d\n", revrse)
|
||||
}
|
||||
if (!look('*')) prsxpr(0);
|
||||
if (look(':')) prsflg(revrse); //Parse Flag Operator
|
||||
else prscmp(revrse); //Parse Comparison Operator
|
||||
tmplbl[0] = 0;
|
||||
do {
|
||||
strcpy(cmplbl, cndlbl); DEBUG("Set CMPLBL to \"%s\"\n", cmplbl);
|
||||
revcmp = revrse;
|
||||
if (look('!')) revcmp = (revcmp) ? FALSE: TRUE;
|
||||
DEBUG("Set REVCMP to %d\n", revcmp)
|
||||
if (!look('*')) prsxpr(0);
|
||||
if (look(':')) prsflg(revcmp); //Parse Flag Operator
|
||||
else prscmp(revcmp); //Parse Comparison Operator
|
||||
prslop(); //Parse Logical Operator
|
||||
if (logopr == LOPOR) {
|
||||
revcmp = (revcmp) ? FALSE: TRUE;
|
||||
DEBUG("Set REVCMP to %d\n", revcmp)
|
||||
}
|
||||
if (logopr && revcmp) {
|
||||
if (!tmplbl[0]) newlbl(tmplbl);
|
||||
strcpy(cmplbl, tmplbl); DEBUG("Set CMPLBL to \"%s\"\n", cmplbl);
|
||||
}
|
||||
prccmp(); //Process Comparison/Flag Operator
|
||||
} while (logopr);
|
||||
if (tmplbl[0]) setlbl(tmplbl);
|
||||
expect(trmntr);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -2,4 +2,9 @@
|
|||
* C02 Conditional Parsing Routines *
|
||||
************************************/
|
||||
|
||||
enum LOGOPS {LOPNONE, LOPAND, LOPOR};
|
||||
|
||||
int revcmp; //Reverse Comparison
|
||||
int logopr; //Logical Operator (set to LOGOPS)
|
||||
|
||||
void prscnd(char trmntr, int revrse); //Parse Conditional Expression
|
||||
|
|
|
|||
|
|
@ -3,6 +3,7 @@
|
|||
******************************************************/
|
||||
|
||||
char curlbl[LABLEN+1]; //Most recently generated label
|
||||
char cmplbl[LABLEN+1]; //Label for Comparison
|
||||
char cndlbl[LABLEN+1]; //Label for Conditional Code
|
||||
char endlbl[LABLEN+1]; //End Label
|
||||
char forlbl[LABLEN+1]; //For Loop Label
|
||||
|
|
|
|||
|
|
@ -28,10 +28,10 @@ int isanum(); //Is Next Character AlphaNumeric
|
|||
int isapos(); //Is Next Character an Apostrophe
|
||||
int isbin(); //Is Next Character a Binary Digit
|
||||
int isbpre(); //Is Next Character a Binary Prefix
|
||||
int islpre(); //Is Next Character a Literal Prefix
|
||||
int isdec(); //Is Next Character a Decimal Digit
|
||||
int iscpre(); //Is Next Character a Constant Prefix
|
||||
int ishexd(); //Is Next Character a Hexadecimal Digit
|
||||
int islpre(); //Is Next Character a Literal Prefix
|
||||
int isnl(); //Is Next Character a NewLine
|
||||
int isnpre(); //Is Next Character a Numeric Prfix
|
||||
int isoper(); //Is Next Character an Operator
|
||||
|
|
|
|||
|
|
@ -48,11 +48,11 @@ void prssif(char trmntr) {
|
|||
prscnd(')', FALSE); //Parse Condition
|
||||
expect('?');
|
||||
prsxpr(':'); //Parse "if TRUE" expression
|
||||
newlbl(tmplbl); //Create End of Expression Label
|
||||
asmlin("JMP", tmplbl); //Jump over "if FALSE" expression
|
||||
newlbl(skplbl); //Create End of Expression Label
|
||||
asmlin("JMP", skplbl); //Jump over "if FALSE" expression
|
||||
setlbl(cndlbl); //Emit "if FALSE" label
|
||||
prsxpr(trmntr); //Parse "if FALSE" expression
|
||||
setlbl(tmplbl); //Emit End of Expression Label
|
||||
setlbl(skplbl); //Emit End of Expression Label
|
||||
}
|
||||
|
||||
/* Process Array Index */
|
||||
|
|
|
|||
Loading…
Reference in New Issue