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发表于 2014-1-24 16:59:47
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) j* e$ R" c4 b2 TConditional Breakpoints
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! N9 J1 t! y3 x4 ?4 g- r8 g* pBreakpoints may also have a conditional statement that causes them to execute only if that statement evaluates to true. The conditional breakpoint grammar has this form:3 [' u: @4 W) x' Z
( u7 p$ N+ f+ \, wConnect -> Compare { ('||' | '&&') Compare }
" b1 e' T6 d8 w7 X' cCompare -> Sum { ('==' | '!=' | '<=' | '>=' | '<' | '>') Sum }
0 k/ Y$ P3 a! W5 Q( i8 v& q+ P8 X( CSum -> Product { ('+' | '-') Product } . B) g* ?5 L0 C% r& r' f3 R) j
Product -> Primitive { ('*' | '/') Primitive } $ Q/ Q2 F/ G! s' b
Primitive -> Number | Address | Register | Flag | PC Bank | Data Bank | '(' Connect ')' ' ?+ Z1 @; R+ O( @/ _
Number -> '#' [0123456789ABCDEF]*
~( m- W4 M3 O$ d v4 y) JAddress -> '$' [0123456789ABCDEF]* | '$' '[' Connect ']'
( s/ D, @4 j% `' \; O0 c" }Register -> 'A' | 'X' | 'Y' | 'P' 1 G) g& q }' n- f6 B! l9 x1 w
Flag -> 'N' | 'C' | 'Z' | 'I' | 'B' | 'V'
: ^: b/ u& x! q* y2 uPC Bank -> 'K' - o" @5 [! F5 U( }- n
Data Bank -> 'T' / H7 @6 h" F& ^2 A9 m
9 m1 o8 M: T1 d5 a7 PThe parser is very strict. All numbers are hexadecimal. Always prefix a number with # for an immediate value, or $ for a memory address. If a memory address needs to be calculated use $[] with the calculation inside the brackets.1 y+ p$ N$ m$ o' ?: B
2 b$ _" u. n) V3 z! o9 W) F! gRegisters A/X/Y are 8-bit unsigned values. Register P is the 16-bit program counter.+ E, A4 c' F; s8 ?
; H" O' {$ v, @2 e' d* G. C0 J4 mFlags evaluate to 1 if set, 0 if clear.4 s6 Z1 Z1 J* D; E5 _+ c4 \
1 N1 b r$ ~2 t, g" \2 U4 fConnecting operators || or && combine boolean terms. Parentheses dictate order of operations.6 ^% s2 ]6 x0 K
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Example conditions:
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Break only if register A is less than value at memory address $0005:4 J- V4 [4 ~: y7 C
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A < $0005
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, A# y; `- P, l) V+ R/ l* OBreak only if the value at the indirect address is not equal to FF:/ ]6 k! f& x. O5 w: Z# e. z
9 x" i* \, d' s* g4 y8 l#FF != $[$10+($11*#100)]
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( g- _# s% o3 D0 o# I+ t" H9 VBreak only if flag N is clear or A is not equal to 00:+ J) M* K) |' p3 Q* s) }. j1 M( s3 e
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(N==#0 || A!=#0)
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Break only when accessing a data from bank 2 (the condiition is relevant when using with Read/Write-type breakpoints):
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6 p, E( Y! ?) g- b1 [T==#2
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