[all-commits] [llvm/llvm-project] 92d2e1: [flang][driver] do not crash when fc1 process mult...

[jeanPerier via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 92d2e13b99ba1770e6307af7ed7ee877bfabde8c
      https://github.com/llvm/llvm-project/commit/92d2e13b99ba1770e6307af7ed7ee877bfabde8c
  Author: jeanPerier <jperier at nvidia.com>
  Date:   2025-05-09 (Fri, 09 May 2025)

  Changed paths:
    M flang/include/flang/Frontend/CompilerInstance.h
    M flang/lib/Frontend/CompilerInstance.cpp
    M flang/lib/Frontend/FrontendAction.cpp
    M flang/lib/Frontend/FrontendActions.cpp
    A flang/test/Driver/multiple-fc1-input.f90

  Log Message:
  -----------
  [flang][driver] do not crash when fc1 process multiple files (#138875)

This is a fix for the issue https://github.com/llvm/llvm-project/issues/137126
that turned out to be a driver issue.

FrontendActions has a loop to process multiple input files and `flang -fc1`
accept multiple files, but the semantic, lowering, and llvm codegen
actions were not re-entrant, and crash or weird behaviors occurred
when processing multiple files with `-fc1`. 

This patch makes the actions reentrant by cleaning-up the contexts/modules
if needed on entry.



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