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| author | clairexen <claire@symbioticeda.com> | 2020-05-29 16:31:44 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-05-29 16:31:44 +0200 |
| commit | af36afe722dc35b129351af592ef340e512e0292 (patch) | |
| tree | c2bd330880c5e443d69ac51fb4a2e45eebeb4016 /manual | |
| parent | 5874a14d659068acbf04aa381a782ea8c0a5adce (diff) | |
| parent | efa7424fb93943d746a344d08e5e879d983709e9 (diff) | |
| download | yosys-af36afe722dc35b129351af592ef340e512e0292.tar.gz yosys-af36afe722dc35b129351af592ef340e512e0292.tar.bz2 yosys-af36afe722dc35b129351af592ef340e512e0292.zip | |
Merge pull request #2092 from whitequark/rtlil-no-space-control
Restrict RTLIL::IdString to not contain whitespace or control chars
Diffstat (limited to 'manual')
| -rw-r--r-- | manual/CHAPTER_Overview.tex | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/manual/CHAPTER_Overview.tex b/manual/CHAPTER_Overview.tex index be37d8d39..ac0f48e47 100644 --- a/manual/CHAPTER_Overview.tex +++ b/manual/CHAPTER_Overview.tex @@ -184,9 +184,12 @@ may hold important information for Yosys developers can be used without disturbing external tools. For example the Verilog backend assigns names in the form {\tt \_{\it integer}\_}. \end{itemize} -In order to avoid programming errors, the RTLIL data structures check if all -identifiers start with either a backslash or a dollar sign and generate a -runtime error if this rule is violated. +Whitespace and control characters (any character with an ASCII code 32 or less) are not allowed +in RTLIL identifiers; most frontends and backends cannot support these characters in identifiers. + +In order to avoid programming errors, the RTLIL data structures check if all identifiers start +with either a backslash or a dollar sign, and contain no whitespace or control characters. +Violating these rules results in a runtime error. All RTLIL identifiers are case sensitive. |