[jdk21u-dev] RFR: 8318811: Compiler directives parser swallows a character after line comments

Fri Apr 25 16:54:07 UTC 2025

Backporting JDK-8318811: Compiler directives parser swallows a character after line comments. Fixes JSON::skip_line_comment() to match specification and "return the first token after the line comment without consuming it" by using `peek` instead of `next`. Adds test. Ran GHA Sanity Checks, local Tier 1 and 2, and new `test/hotspot/jtreg/compiler/compilercontrol/parser/DirectiveParserTest.java` tests. Patch is clean.

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Commit messages:
 - Backport 141dae8b76d41accfa02a0250a1c24364cbf6f25

Changes: https://git.openjdk.org/jdk21u-dev/pull/1717/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1717&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318811
  Stats: 21 lines in 2 files changed: 20 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1717.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1717/head:pull/1717

PR: https://git.openjdk.org/jdk21u-dev/pull/1717