Matthew Pickering pushed to branch wip/stable-ipe-info at Glasgow Haskell Compiler / GHC
Commits:
bcdec657 by Zubin Duggal at 2025-08-05T10:37:29+05:30
compiler: Export a version of `newNameCache` that is not prone to footguns.
`newNameCache` must be initialized with both a non-"reserved" unique tag, as well
as a list of known key names. Failing to do so results in hard to debug unique conflicts.
It is difficult for API users to tell which unique tags are safe to use. So instead of leaving
this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed
non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations
of the compiler.
The original version of `newNameCache` is now exported as `newNameCache'` for advanced users.
We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in
functionality by `newNameCache` and `newNameCache'`.
Fixes #26135 and #26055
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57d3b4a8 by Andrew Lelechenko at 2025-08-05T18:36:31-04:00
hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2
In line with #25693 we should use GHC 9.10 as a boot compiler,
while Hadrian stack.yaml was stuck on GHC 9.6.
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c2a78cea by Peng Fan at 2025-08-05T18:37:27-04:00
NCG/LA64: implement atomic write with finer-grained DBAR hints
Signed-off-by: Peng Fan
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95231c8e by Teo Camarasu at 2025-08-06T08:35:58-04:00
CODEOWNERS: add CLC as codeowner of base
We also remove hvr, since I think he is no longer active
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77df0ded by Andrew Lelechenko at 2025-08-06T08:36:39-04:00
Bump submodule text to 2.1.3
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8af260d0 by Nikolaos Chatzikonstantinou at 2025-08-06T08:37:23-04:00
docs: fix internal import in getopt examples
This external-facing doc example shouldn't mention GHC internals when
using 'fromMaybe'.
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69cc16ca by Marc Scholten at 2025-08-06T15:51:28-04:00
README: Add note on ghc.nix
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93a2f450 by Daniel Díaz at 2025-08-06T15:52:14-04:00
Link to the "Strict Bindings" docs from the linear types docs
Strict Bidings are relevant for the kinds of multiplicity annotations
linear lets support.
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246b7853 by Matthew Pickering at 2025-08-07T06:58:30-04:00
level imports: Check the level of exported identifiers
The level imports specification states that exported identifiers have to
be at level 0. This patch adds the requird level checks that all
explicitly mentioned identifiers occur at level 0.
For implicit export specifications (T(..) and module B), only level 0
identifiers are selected for re-export.
ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705
Fixes #26090
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358bc4fc by fendor at 2025-08-07T06:59:12-04:00
Bump GHC on darwin CI to 9.10.1
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1903ae35 by Matthew Pickering at 2025-08-07T12:21:10+01:00
ipe: Place strings and metadata into specific .ipe section
By placing the .ipe metadata into a specific section it can be stripped
from the final binary if desired.
```
objcopy --remove-section .ipe <binary>
upx <binary>
```
Towards #21766
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c80dd91c by Matthew Pickering at 2025-08-07T12:22:42+01:00
ipe: Place magic word at the start of entries in the .ipe section
The magic word "IPE\nIPE\n" is placed at the start of .ipe sections,
then if the section is stripped, we can check whether the section starts
with the magic word or not to determine whether there is metadata
present or not.
Towards #21766
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cab42666 by Matthew Pickering at 2025-08-07T12:22:42+01:00
ipe: Use stable IDs for IPE entries
IPEs have historically been indexed and reported by their address.
This makes it impossible to compare profiles between runs, since the
addresses may change (due to ASLR) and also makes it tricky to separate
out the IPE map from the binary.
This small patch adds a stable identifier for each IPE entry.
The stable identifier is a single 64 bit word. The high-bits are a
per-module identifier and the low bits identify which entry in each
module.
1. When a node is added into the IPE buffer it is assigned a unique
identifier from an incrementing global counter.
2. Each entry already has an index by it's position in the
`IpeBufferListNode`.
The two are combined together by the `IPE_ENTRY_KEY` macro.
Info table profiling uses the stable identifier rather than the address
of the info table.
The benefits of this change are:
* Profiles from different runs can be easily compared
* The metadata can be extracted from the binary (via the eventlog for
example) and then stripped from the executable.
Fixes #21766
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42 changed files:
- .gitlab/darwin/toolchain.nix
- CODEOWNERS
- README.md
- compiler/GHC/Cmm.hs
- compiler/GHC/CmmToAsm/LA64/CodeGen.hs
- compiler/GHC/CmmToAsm/PPC/Ppr.hs
- compiler/GHC/CmmToAsm/Ppr.hs
- compiler/GHC/CmmToLlvm/Data.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/StgToCmm/InfoTableProv.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/Name/Reader.hs
- docs/users_guide/debug-info.rst
- docs/users_guide/exts/linear_types.rst
- docs/users_guide/exts/strict.rst
- hadrian/stack.yaml
- hadrian/stack.yaml.lock
- libraries/base/src/System/Console/GetOpt.hs
- libraries/text
- rts/IPE.c
- rts/ProfHeap.c
- rts/eventlog/EventLog.c
- rts/include/rts/IPE.h
- testsuite/tests/hiefile/should_run/TestUtils.hs
- testsuite/tests/rts/ipe/ipeMap.c
- testsuite/tests/rts/ipe/ipe_lib.c
- + testsuite/tests/splice-imports/DodgyLevelExport.hs
- + testsuite/tests/splice-imports/DodgyLevelExport.stderr
- + testsuite/tests/splice-imports/DodgyLevelExportA.hs
- + testsuite/tests/splice-imports/LevelImportExports.hs
- + testsuite/tests/splice-imports/LevelImportExports.stdout
- + testsuite/tests/splice-imports/LevelImportExportsA.hs
- testsuite/tests/splice-imports/Makefile
- + testsuite/tests/splice-imports/ModuleExport.hs
- + testsuite/tests/splice-imports/ModuleExport.stderr
- + testsuite/tests/splice-imports/ModuleExportA.hs
- + testsuite/tests/splice-imports/ModuleExportB.hs
- + testsuite/tests/splice-imports/T26090.hs
- + testsuite/tests/splice-imports/T26090.stderr
- + testsuite/tests/splice-imports/T26090A.hs
- testsuite/tests/splice-imports/all.T
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5cd6a7204674dc4e21f404a1c191326...
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5cd6a7204674dc4e21f404a1c191326...
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