Check for overflow in fixed-point precision suffix (#1918)

Fixes #1917

test/asm/fixed-point-precision.asm

@@ -21,3 +21,5 @@ def q24 = 1.25q.24
 
 def qerr = 1.25q32
 	println "{q0f:qerr}"
+def qerr = 1.25q264
+	println "{q999f:qerr}"

test/asm/fixed-point-precision.err

@@ -2,4 +2,8 @@ error: Fixed-point constant precision must be between 1 and 31
     at fixed-point-precision.asm(22)
 error: Fixed-point constant precision 0 invalid, defaulting to 16
     at fixed-point-precision.asm(23)
-Assembly aborted with 2 errors
+error: Fixed-point constant precision must be between 1 and 31
+    at fixed-point-precision.asm(24)
+error: Fixed-point constant precision 999 invalid, defaulting to 16
+    at fixed-point-precision.asm(25)
+Assembly aborted with 4 errors

test/asm/fixed-point-precision.out

@@ -7,3 +7,4 @@
 0.00488q16 1.25000q16 320.00000q16
 Q8 $140 Q16 $14000 Q24 $1400000
 1.25000
+1.25000

test/asm/fixed-point-syntax.asm

@@ -6,6 +6,12 @@ println 12.34_q.5
 println 1_2.3_4_q15
 println 1.q2
 
+; warning
+println 1.000_000_000_000_001
+println 1.999_999_999_999_999
+println 1.000_000_000_000_001q16
+println 1.999_999_999_999_999q.16
+
 ; bad
 println 12.34q0
 println 12.34q_15 ; lexes as `12.34q` (invalid) then symbol `_15`
@@ -14,6 +20,3 @@ println 1_.2
 println 1._2
 println 1.__2
 println 1.2q
-println 1.999_999_999_999_999
-println 1.999_999_999_999_999q16
-println 1.999_999_999_999_999q.16

test/asm/fixed-point-syntax.err

@@ -1,25 +1,27 @@
-error: Fixed-point constant precision must be between 1 and 31
+warning: Fixed-point constant has too many fractional digits [-Wlarge-constant]
     at fixed-point-syntax.asm(10)
-error: Invalid fixed-point constant, no digits after 'q'
+warning: Fixed-point constant has too many fractional digits [-Wlarge-constant]
     at fixed-point-syntax.asm(11)
-error: syntax error, unexpected symbol
-    at fixed-point-syntax.asm(11)
-error: syntax error, unexpected symbol
+warning: Fixed-point constant has too many fractional digits [-Wlarge-constant]
     at fixed-point-syntax.asm(12)
-error: Invalid integer constant, trailing '_'
+warning: Fixed-point constant has too many fractional digits [-Wlarge-constant]
     at fixed-point-syntax.asm(13)
-error: Invalid fixed-point constant, '_' after '.'
-    at fixed-point-syntax.asm(14)
-error: Invalid fixed-point constant, '_' after '.'
-    at fixed-point-syntax.asm(15)
-error: Invalid fixed-point constant, '_' after another '_'
-    at fixed-point-syntax.asm(15)
-error: Invalid fixed-point constant, no digits after 'q'
+error: Fixed-point constant precision must be between 1 and 31
     at fixed-point-syntax.asm(16)
-warning: Precision of fixed-point constant is too large [-Wlarge-constant]
+error: Invalid fixed-point constant, no digits after 'q'
     at fixed-point-syntax.asm(17)
-warning: Precision of fixed-point constant is too large [-Wlarge-constant]
+error: syntax error, unexpected symbol
+    at fixed-point-syntax.asm(17)
+error: syntax error, unexpected symbol
     at fixed-point-syntax.asm(18)
-warning: Precision of fixed-point constant is too large [-Wlarge-constant]
+error: Invalid integer constant, trailing '_'
     at fixed-point-syntax.asm(19)
+error: Invalid fixed-point constant, '_' after '.'
+    at fixed-point-syntax.asm(20)
+error: Invalid fixed-point constant, '_' after '.'
+    at fixed-point-syntax.asm(21)
+error: Invalid fixed-point constant, '_' after another '_'
+    at fixed-point-syntax.asm(21)
+error: Invalid fixed-point constant, no digits after 'q'
+    at fixed-point-syntax.asm(22)
 Assembly aborted with 9 errors

test/asm/fixed-point-syntax.out

@@ -4,11 +4,12 @@ $4D2915B
 $18B
 $62B85
 $4
+$10000
+$10000
+$10000
+$10000
 $C570A
 $13333
 $13333
 $13333
 $13333
-$10000
-$10000
-$10000

test/asm/interpolation-overflow.err

@@ -1,6 +1,6 @@
 error: Fractional width 99999999 too long, limiting to 255
     at interpolation-overflow.asm(4)
-warning: Precision of fixed-point constant is too large [-Wlarge-constant]
+warning: Fixed-point constant has too many fractional digits [-Wlarge-constant]
     at interpolation-overflow.asm(4)
     while expanding symbol `x`
 error: `\1` cannot be used outside of a macro

test/asm/invalid-numbers.err

@@ -16,7 +16,7 @@ warning: Integer constant is too large [-Wlarge-constant]
     at invalid-numbers.asm::try(2) <- invalid-numbers.asm(20)
 warning: Integer constant is too large [-Wlarge-constant]
     at invalid-numbers.asm::try(2) <- invalid-numbers.asm(21)
-warning: Graphics constant is too large; only first 8 pixels considered [-Wlarge-constant]
+warning: Graphics constant has too many digits; only first 8 pixels considered [-Wlarge-constant]
     at invalid-numbers.asm::try(2) <- invalid-numbers.asm(22)
 warning: Magnitude of fixed-point constant is too large [-Wlarge-constant]
     at invalid-numbers.asm::try(2) <- invalid-numbers.asm(23)

test/asm/overflow.err

@@ -4,5 +4,5 @@ warning: Division of -2147483648 by -1 yields -2147483648 [-Wdiv]
     at overflow.asm(24)
 warning: Integer constant is too large [-Wlarge-constant]
     at overflow.asm(44)
-warning: Graphics constant is too large; only first 8 pixels considered [-Wlarge-constant]
+warning: Graphics constant has too many digits; only first 8 pixels considered [-Wlarge-constant]
     at overflow.asm(47)