[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 2 commits: Refactoring: use Platform instead of DynFlags when possible

[Marge Bot]

 Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC


Commits:
64f20756 by Sylvain Henry at 2020-03-19T16:16:49Z
Refactoring: use Platform instead of DynFlags when possible

Metric Decrease:
    ManyConstructors
    T12707
    T13035
    T1969

- - - - -
cb1785d9 by Ömer Sinan Ağacan at 2020-03-19T16:16:54Z
FastString: fix eager reading of string ptr in hashStr

This read causes NULL dereferencing when len is 0.

Fixes #17909

In the reproducer in #17909 this bug is triggered as follows:

- SimplOpt.dealWithStringLiteral is called with a single-char string
  ("=" in #17909)

- tailFS gets called on the FastString of the single-char string.

- tailFS checks the length of the string, which is 1, and calls
  mkFastStringByteString on the tail of the ByteString, which is an
  empty ByteString as the original ByteString has only one char.

- ByteString's unsafeUseAsCStringLen returns (NULL, 0) for the empty
  ByteString, which is passed to mkFastStringWith.

- mkFastStringWith gets hash of the NULL pointer via hashStr, which
  fails on empty strings because of this bug.

- - - - -


30 changed files:

- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/Cmm/CallConv.hs
- compiler/GHC/Cmm/DebugBlock.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/Graph.hs
- compiler/GHC/Cmm/Info.hs
- compiler/GHC/Cmm/Info/Build.hs
- compiler/GHC/Cmm/LayoutStack.hs
- compiler/GHC/Cmm/Lint.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Opt.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/Cmm/Pipeline.hs
- compiler/GHC/Cmm/Ppr.hs
- compiler/GHC/Cmm/Ppr/Decl.hs
- compiler/GHC/Cmm/Ppr/Expr.hs
- compiler/GHC/Cmm/Sink.hs
- compiler/GHC/Cmm/Switch/Implement.hs
- compiler/GHC/Cmm/Type.hs
- compiler/GHC/Cmm/Utils.hs
- compiler/GHC/CmmToAsm.hs
- compiler/GHC/CmmToAsm/PIC.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/PPC/Ppr.hs
- compiler/GHC/CmmToAsm/SPARC/CodeGen.hs
- compiler/GHC/CmmToAsm/SPARC/CodeGen/Amode.hs
- compiler/GHC/CmmToAsm/SPARC/CodeGen/Base.hs
- compiler/GHC/CmmToAsm/SPARC/CodeGen/CondCode.hs
- compiler/GHC/CmmToAsm/SPARC/CodeGen/Gen32.hs
- compiler/GHC/CmmToAsm/SPARC/Ppr.hs


The diff was not included because it is too large.


View it on GitLab: https://gitlab.haskell.org/ghc/ghc/compare/15d057107600c4ad144ca4065455a8b70f0a109c...cb1785d9f839e34a3a4892f354f0c51cc6553c0e

-- 
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/compare/15d057107600c4ad144ca4065455a8b70f0a109c...cb1785d9f839e34a3a4892f354f0c51cc6553c0e
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