{
"file_path": "/app/HACKING.adoc"
}File does not exist. Note: your current working directory is /app. [error] tool reported failure
{
"command": "git diff HEAD~1 --stat",
"description": "Show files changed in last commit"
}Exit code 129
warning: Not a git repository. Use --no-index to compare two paths outside a working tree
usage: git diff --no-index [<options>] <path> <path>
Diff output format options
-p, --patch generate patch
-s, --no-patch suppress diff output
-u generate patch
-U, --unified[=<n>] generate diffs with <n> lines context
-W, --[no-]function-context
generate diffs with <n> lines context
--raw generate the diff in raw format
--patch-with-raw synonym for '-p --raw'
--patch-with-stat synonym for '-p --stat'
--numstat machine friendly --stat
--shortstat output only the last line of --stat
-X, --dirstat[=<param1,param2>...]
output the distribution of relative amount of changes for each sub-directory
--cumulative synonym for --dirstat=cumulative
--dirstat-by-file[=<param1,param2>...]
synonym for --dirstat=files,param1,param2...
--check warn if changes introduce conflict markers or whitespace errors
--summary condensed summary such as creations, renames and mode changes
--name-only show only names of changed files
--name-status show only names and status of changed files
--stat[=<width>[,<name-width>[,<count>]]]
generate diffstat
--stat-width <width> generate diffstat with a given width
--stat-name-width <width>
generate diffstat with a given name width
--stat-graph-width <width>
generate diffstat with a given graph width
--stat-count <count> generate diffstat with limited lines
--[no-]compact-summary
generate compact summary in diffstat
--binary output a binary diff that can be applied
--[no-]full-index show full pre- and post-image object names on the "index" lines
--[no-]color[=<when>] show colored diff
--ws-error-highlight <kind>
highlight whitespace errors in the 'context', 'old' or 'new' lines in the diff
-z do not munge pathnames and use NULs as output field terminators in --raw or --numstat
--[no-]abbrev[=<n>] use <n> digits to display object names
--src-prefix <prefix> show the given source prefix instead of "a/"
--dst-prefix <prefix> show the given destination prefix instead of "b/"
--line-prefix <prefix>
prepend an additional prefix to every line of output
--no-prefix do not show any source or destination prefix
--default-prefix use default prefixes a/ and b/
--inter-hunk-context <n>
show context between diff hunks up to the specified number of lines
--output-indicator-new <char>
specify the character to indicate a new line instead of '+'
--output-indicator-old <char>
specify the character to indicate an old line instead of '-'
--output-indicator-context <char>
specify the character to indicate a context instead of ' '
Diff rename options
-B, --break-rewrites[=<n>[/<m>]]
break complete rewrite changes into pairs of delete and create
-M, --find-renames[=<n>]
detect renames
-D, --irreversible-delete
omit the preimage for deletes
-C, --find-copies[=<n>]
detect copies
--[no-]find-copies-harder
use unmodified files as source to find copies
--no-renames disable rename detection
--[no-]rename-empty use empty blobs as rename source
--[no-]follow continue listing the history of a file beyond renames
-l <n> prevent rename/copy detection if the number of rename/copy targets exceeds given limit
Diff algorithm options
--minimal produce the smallest possible diff
-w, --ignore-all-space
ignore whitespace when comparing lines
-b, --ignore-space-change
ignore changes in amount of whitespace
--ignore-space-at-eol ignore changes in whitespace at EOL
--ignore-cr-at-eol ignore carrier-return at the end of line
--ignore-blank-lines ignore changes whose lines are all blank
-I, --[no-]ignore-matching-lines <regex>
ignore changes whose all lines match <regex>
--[no-]indent-heuristic
heuristic to shift diff hunk boundaries for easy reading
--patience generate diff using the "patience diff" algorithm
--histogram generate diff using the "histogram diff" algorithm
--diff-algorithm <algorithm>
choose a diff algorithm
--anchored <text> generate diff using the "anchored diff" algorithm
--word-diff[=<mode>] show word diff, using <mode> to delimit changed words
--word-diff-regex <regex>
use <regex> to decide what a word is
--color-words[=<regex>]
equivalent to --word-diff=color --word-diff-regex=<regex>
--[no-]color-moved[=<mode>]
moved lines of code are colored differently
--[no-]color-moved-ws <mode>
how white spaces are ignored in --color-moved
Other diff options
--[no-]relative[=<prefix>]
when run from subdir, exclude changes outside and show relative paths
-a, --[no-]text treat all files as text
-R swap two inputs, reverse the diff
--[no-]exit-code exit with 1 if there were differences, 0 otherwise
--[no-]quiet disable all output of the program
--[no-]ext-diff allow an external diff helper to be executed
--[n{
"command": "git log --oneline -20",
"description": "Show recent commits"
}Exit code 128 fatal: not a git repository (or any of the parent directories): .git [error] tool reported failure
{
"command": "ls /app/",
"description": "List top-level directory"
}ocaml
[stdout]
ocaml
[metadata] {"noOutputExpected": false}{
"command": "find /app -name \"HACKING*\" -o -name \"HACKING.adoc\" 2>/dev/null | head -5",
"description": "Find HACKING file"
}/app/ocaml/HACKING.adoc
/app/ocaml/typing/HACKING.adoc
/app/ocaml/utils/HACKING.adoc
/app/ocaml/parsing/HACKING.adoc
/app/ocaml/runtime/HACKING.adoc
[stdout]
/app/ocaml/HACKING.adoc
/app/ocaml/typing/HACKING.adoc
/app/ocaml/utils/HACKING.adoc
/app/ocaml/parsing/HACKING.adoc
/app/ocaml/runtime/HACKING.adoc
[metadata] {"noOutputExpected": false}{
"command": "ls /app/ocaml/runtime/",
"description": "List runtime directory"
}HACKING.adoc
addrmap.c
afl.c
alloc.c
amd64.S
amd64nt.asm
arm64.S
array.c
backtrace.c
backtrace_byt.c
backtrace_nat.c
bigarray.c
blake2.c
callback.c
caml
clambda_checks.c
codefrag.c
compare.c
custom.c
debugger.c
domain.c
dune
dynlink.c
dynlink_nat.c
extern.c
fail.c
fail_byt.c
fail_nat.c
fiber.c
finalise.c
fix_code.c
floats.c
frame_descriptors.c
gc_ctrl.c
gc_stats.c
gen_primitives.sh
gen_primsc.sh
globroots.c
hash.c
instrtrace.c
intern.c
interp.c
ints.c
io.c
lexing.c
lf_skiplist.c
main.c
major_gc.c
md5.c
memory.c
memprof.c
meta.c
minor_gc.c
misc.c
obj.c
parsing.c
platform.c
power.S
printexc.c
prng.c
riscv.S
roots.c
runtime_events.c
s390x.S
sak.c
shared_heap.c
signals.c
signals_nat.c
skiplist.c
startup_aux.c
startup_byt.c
startup_nat.c
str.c
sync.c
sync_posix.h
sys.c
tsan.c
unix.c
weak.c
win32.c
zstd.c
[stdout]
HACKING.adoc
addrmap.c
afl.c
alloc.c
amd64.S
amd64nt.asm
arm64.S
array.c
backtrace.c
backtrace_byt.c
backtrace_nat.c
bigarray.c
blake2.c
callback.c
caml
clambda_checks.c
codefrag.c
compare.c
custom.c
debugger.c
domain.c
dune
dynlink.c
dynlink_nat.c
extern.c
fail.c
fail_byt.c
fail_nat.c
fiber.c
finalise.c
fix_code.c
floats.c
frame_descriptors.c
gc_ctrl.c
gc_stats.c
gen_primitives.sh
gen_primsc.sh
globroots.c
hash.c
instrtrace.c
intern.c
interp.c
ints.c
io.c
lexing.c
lf_skiplist.c
main.c
major_gc.c
md5.c
memory.c
memprof.c
meta.c
minor_gc.c
misc.c
obj.c
parsing.c
platform.c
power.S
printexc.c
prng.c
riscv.S
roots.c
runtime_events.c
s390x.S
sak.c
shared_heap.c
signals.c
signals_nat.c
skiplist.c
startup_aux.c
startup_byt.c
startup_nat.c
str.c
sync.c
sync_posix.h
sys.c
tsan.c
unix.c
weak.c
win32.c
zstd.c
[metadata] {"noOutputExpected": false}{
"file_path": "/app/ocaml/HACKING.adoc"
}1 = Hacking the compiler :camel: 2 3 This document is a work-in-progress attempt to provide useful 4 information for people willing to inspect or modify the compiler 5 distribution's codebase. Feel free to improve it by sending change 6 proposals for it. 7 8 If you already have a patch that you would like to contribute to the 9 official distribution, please see link:CONTRIBUTING.md[]. 10 11 === Your first compiler modification 12 13 1. Create a new git branch to store your changes. 14 + 15 ---- 16 git checkout -b my-modification 17 ---- 18 Usually, this branch wants to be based on `trunk`. If your changes must be on a 19 specific release, use its release branch (*not* the release tag) instead. For 20 example, to make a fix for 4.11.1, base your branch on *4.11* (not on *4.11.1*). 21 The `configure` step for the compiler recognises a development build from the 22 `+dev` in the version number (see file `VERSION`), and release tarballs and the tagged Git commits do 23 not have this which causes some important development things to be disabled 24 (ocamltest and converting C compiler warnings to errors). 25 26 2. Consult link:INSTALL.adoc[] for build instructions. Here is the gist of it: 27 + 28 ---- 29 ./configure 30 make -j 4 31 ---- 32 If you are on a release build and need development options, you can add 33 `--enable-ocamltest` (to allow running the testsuite) and `--enable-warn-error` 34 (so you don't get caught by CI later!). 35 36 3. Try the newly built compiler binaries `ocamlc`, `ocamlopt` or their 37 `.opt` version. To try the toplevel, use: 38 + 39 ---- 40 make runtop 41 ---- 42 43 4. Hack frenetically and keep rebuilding. 44 45 5. Run the testsuite from time to time. 46 + 47 ---- 48 make tests 49 ---- 50 51 6. You did it, Well done! Consult link:CONTRIBUTING.md[] to send your contribution upstream. 52 53 See also our <<tips,development tips and tricks>>, for example on how to 54 <<opam-switch,create an opam switch>> to test your modified compiler. 55 56 === What to do 57 58 There is always a lot of potential tasks, both for old and 59 newcomers. Here are various potential projects: 60 61 * https://github.com/ocaml/ocaml/issues[The OCaml 62 bugtracker] contains reported bugs and feature requests. Some 63 changes that should be accessible to newcomers are marked with the 64 tag link:++https://github.com/ocaml/ocaml/issues?q=is%3Aopen+is%3Aissue+label%3Anewcomer-job++[ 65 newcomer-job]. 66 67 * The 68 https://github.com/ocamllabs/compiler-hacking/wiki/Things-to-work-on[OCaml 69 Labs compiler-hacking wiki] contains various ideas of changes to 70 propose, some easy, some requiring a fair amount of work. 71 72 * Documentation improvements are always much appreciated, either in 73 the various `.mli` files or in the official manual 74 (See link:manual/README.md[]). If you invest effort in understanding 75 a part of the codebase, submitting a pull request that adds 76 clarifying comments can be an excellent contribution to help you, 77 next time, and other code readers. 78 79 * The https://github.com/ocaml/ocaml[github project] contains a lot of 80 pull requests, many of them being in dire need of a review -- we 81 have more people willing to contribute changes than to review 82 someone else's change. Picking one of them, trying to understand the 83 code (looking at the code around it) and asking questions about what 84 you don't understand or what feels odd is super-useful. It helps the 85 contribution process, and it is also an excellent way to get to know 86 various parts of the compiler from the angle of a specific aspect or 87 feature. 88 + 89 Again, reviewing small or medium-sized pull requests is accessible to 90 anyone with OCaml programming experience, and helps maintainers and 91 other contributors. If you also submit pull requests yourself, a good 92 discipline is to review at least as many pull requests as you submit. 93 94 == Structure of the compiler 95 96 The compiler codebase can be intimidating at first sight. Here are 97 a few pointers to get started. 98 99 === Compilation pipeline 100 101 ==== The driver -- link:driver/[] 102 103 The driver contains the "main" function of the compilers that drive 104 compilation. It parses the command-line arguments and composes the 105 required compiler passes by calling functions from the various parts 106 of the compiler described below. 107 108 ==== Parsing -- link:parsing/[] 109 110 Parses source files and produces an Abstract Syntax Tree (AST) 111 (link:parsing/parsetree.mli[] has lot of helpful comments). See 112 link:parsing/HACKING.adoc[]. 113 114 The logic for Camlp4 and Ppx preprocessing is not in link:parsing/[], 115 but in link:driver/[], see link:driver/pparse.mli[] and 116 link:driver/pparse.ml[]. 117 118 ==== Typing -- link:typing/[] 119 120 Type-checks the AST and produces a typed representation of the program 121 (link:typing/typedtree.mli[] has some helpful comments). See 122 link:typing/HACKING.adoc[]. 123 124 ==== The bytecode compiler -- link:bytecomp/[] 125 126 ==== The native compiler -- link:middle_end/[] and link:asmcomp/[] 127 128 === Runtime system 129 130 The low-level routines that OCaml programs use during their execution: 131 garbage collection, interaction with the operating system 132 (IO in particular), low-level primitives to manipulate some OCaml data 133 structures, etc. Mostly implemented in C, with some rare bits of 134 assembly code in architecture-specific files. The "includes" 135 corresponding to the `.c` files are in the link:runtime/caml[] 136 subdirectory. 137 138 Some files are only used by bytecode programs, some only used by 139 native-compiled programs, but most of the runtime code is 140 common. (See `runtime_COMMON_C_SOURCES`, `runtime_BYTECODE_ONLY_C_SOURCES`, 141 and `runtime_NATIVE_ONLY_C_SOURCES` in link:Makefile[] for the list of common, 142 bytecode-only, and native-only source files.) 143 144 See link:runti
{
"description": "Explore GC changes",
"prompt": "In the OCaml compiler at /app/ocaml, the user modified the garbage collector to add run-length compression of free space in the major heap sweeping. \n\nPlease examine these key files thoroughly:\n1. /app/ocaml/runtime/major_gc.c\n2. /app/ocaml/runtime/shared_heap.c\n3. /app/ocaml/runtime/caml/shared_heap.h\n4. /app/ocaml/runtime/caml/major_gc.h\n\nLook for any recently-added or modified code related to run-length encoding/compression of free space, sweep logic, and any potential bugs. Report all suspicious code, off-by-one errors, incorrect pointer arithmetic, missing updates, etc. Be very thorough - read the full files.",
"subagent_type": "Explore"
}{"type": "text", "text": "Async agent launched successfully. (This tool result is internal metadata — never quote or paste any part of it, including the agentId below, into a user-facing reply.)\nagentId: a31dc10c40107d46e (internal ID - do not mention to user. Use SendMessage with to: 'a31dc10c40107d46e', summary: '<5-10 word recap>' to continue this agent.)\nThe agent is working in the background. You will be notified automatically when it completes. You know nothing about its results until that notification arrives — do not report, assume, or predict them; continue other work or respond to the user in the meantime.\nDo not duplicate this agent's work — avoid working with the same files or topics it is using.\noutput_file: /tmp/claude-0/-app/b94ed9d6-ef17-4b64-8143-6edbd35f75b4/tasks/a31dc10c40107d46e.output\nDo NOT Read or tail this file via the shell tool — it is the full subagent JSONL transcript and reading it will overflow your context. If the user asks for progress, say the agent is still running; you'll get a completion notification."}
[metadata] {"isAsync": true, "status": "async_launched", "agentId": "a31dc10c40107d46e", "description": "Explore GC changes", "resolvedModel": "mimo-v2.5-pro", "prompt": "In the OCaml compiler at /app/ocaml, the user modified the garbage collector to add run-length compression of free space in the major heap sweeping. \n\nPlease examine these key files thoroughly:\n1. /app/ocaml/runtime/major_gc.c\n2. /app/ocaml/runtime/shared_heap.c\n3. /app/ocaml/runtime/caml/shared_heap.h\n4. /app/ocaml/runtime/caml/major_gc.h\n\nLook for any recently-added or modified code related to run-length encoding/compression of free space, sweep logic, and any potential bugs. Report all suspicious code, off-by-one errors, incorrect pointer arithmetic, missing updates, etc. Be very thorough - read the full files.", "outputFile": "/tmp/claude-0/-app/b94ed9d6-ef17-4b64-8143-6edbd35f75b4/tasks/a31dc10c40107d46e.output", "canReadOutputFile": true}{
"command": "cd /app/ocaml && ./configure 2>&1 | tail -20",
"description": "Configure the OCaml compiler",
"timeout": 120000
}config.status: creating otherlibs/dynlink/META
config.status: creating otherlibs/runtime_events/META
config.status: creating stdlib/META
config.status: creating ocamldoc/META
config.status: creating otherlibs/unix/META
config.status: creating otherlibs/str/META
config.status: creating otherlibs/systhreads/META
config.status: creating ocamltest/ocamltest_config.ml
config.status: creating runtime/caml/exec.h
config.status: creating runtime/caml/m.h
config.status: creating runtime/caml/s.h
config.status: creating runtime/caml/version.h
config.status: linking file_formats/cmo_format.mli to otherlibs/dynlink/dynlink_cmo_format.mli
config.status: linking file_formats/cmxs_format.mli to otherlibs/dynlink/dynlink_cmxs_format.mli
config.status: linking otherlibs/dynlink/dynlink_platform_intf.ml to otherlibs/dynlink/dynlink_platform_intf.mli
config.status: linking otherlibs/unix/unix_unix.ml to otherlibs/unix/unix.ml
config.status: linking ocamltest/ocamltest_unix_real.ml to ocamltest/ocamltest_unix.ml
config.status: executing libtool commands
config.status: executing shebang commands
config.status: executing links commands
[stdout]
config.status: creating otherlibs/dynlink/META
config.status: creating otherlibs/runtime_events/META
config.status: creating stdlib/META
config.status: creating ocamldoc/META
config.status: creating otherlibs/unix/META
config.status: creating otherlibs/str/META
config.status: creating otherlibs/systhreads/META
config.status: creating ocamltest/ocamltest_config.ml
config.status: creating runtime/caml/exec.h
config.status: creating runtime/caml/m.h
config.status: creating runtime/caml/s.h
config.status: creating runtime/caml/version.h
config.status: linking file_formats/cmo_format.mli to otherlibs/dynlink/dynlink_cmo_format.mli
config.status: linking file_formats/cmxs_format.mli to otherlibs/dynlink/dynlink_cmxs_format.mli
config.status: linking otherlibs/dynlink/dynlink_platform_intf.ml to otherlibs/dynlink/dynlink_platform_intf.mli
config.status: linking otherlibs/unix/unix_unix.ml to otherlibs/unix/unix.ml
config.status: linking ocamltest/ocamltest_unix_real.ml to ocamltest/ocamltest_unix.ml
config.status: executing libtool commands
config.status: executing shebang commands
config.status: executing links commands
[metadata] {"noOutputExpected": false}