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news: update

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Akim Demaille
2019-10-10 18:04:27 +02:00
parent 2c66acfec0
commit d50df39f1a
1 changed files with 38 additions and 10 deletions
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NEWS
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@@ -59,21 +59,49 @@ GNU Bison NEWS
| %empty | %empty
foo.y: warning: fix-its can be applied. Rerun with option '--update'. [-Wother] foo.y: warning: fix-its can be applied. Rerun with option '--update'. [-Wother]
*** Diagnostics about long lines
Quoted sources may now be truncated to fit the screen. For instance, on a
30-column wide terminal:
$ cat foo.y
%token FOO FOO FOO
%%
exp: FOO
$ bison foo.y
foo.y:1.34-36: warning: symbol FOO redeclared [-Wother]
1 | … FOO …
| ^~~
foo.y:1.8-10: previous declaration
1 | %token FOO …
| ^~~
foo.y:1.62-64: warning: symbol FOO redeclared [-Wother]
1 | … FOO
| ^~~
foo.y:1.8-10: previous declaration
1 | %token FOO …
| ^~~
*** Debug traces in Java *** Debug traces in Java
The Java backend no longer emits code and data for parser tracing if the The Java backend no longer emits code and data for parser tracing if the
%define variable parse.trace is not defined. %define variable parse.trace is not defined.
*** Templates prefer signed integer types *** Generated parsers prefer signed integer types
Bison templates now prefer signed to unsigned integer types when Bison skeletons now prefer signed to unsigned integer types when either
either will do, as the signed types are less error-prone and allow will do, as the signed types are less error-prone and allow for better
for better checking with 'gcc -fsanitize=undefined'. Also, the checking with 'gcc -fsanitize=undefined'. Also, the types chosen are now
types chosen are now portable to unusual machines where char, short and portable to unusual machines where char, short and int are all the same
int are all the same width. On non-GNU platforms this may entail width. On non-GNU platforms this may entail including <limits.h> and (if
including <limits.h> and (if available) <stdint.h> to define integer types available) <stdint.h> to define integer types and constants.
and constants.
*** Generated parsers use better types for states
Stacks now use the best integral type for state numbers, instead of always
using 15 bits. As a result "small" parsers now have a smaller memory
footprint (they use 8 bits), and there is support for large automata (16
bits), and extra large (using int, i.e., typically 31 bits).
* Noteworthy changes in release 3.4.2 (2019-09-12) [stable] * Noteworthy changes in release 3.4.2 (2019-09-12) [stable]
@@ -975,10 +1003,10 @@ GNU Bison NEWS
bison used to report: bison used to report:
/tmp/foo.yy:2.10-11: error: %printer redeclaration for FOO foo.yy:2.10-11: error: %printer redeclaration for FOO
%printer {} "foo" %printer {} "foo"
^^ ^^
/tmp/foo.yy:3.10-11: previous declaration foo.yy:3.10-11: previous declaration
%printer {} FOO %printer {} FOO
^^ ^^