[inspector] Fix mapping between location and offset.

We weren't really translating between location (line and column number)
and source position (character offset) consistently, especially when it
came to inline <script>s. There were also inconsistencies between what
Debugger.getPossibleBreakpoints and Debugger.setBreakpointByUrl would
do.

With this CL, we are now consistently operating under the following
assumptions:

(1) For inline <scripts>s with a //@ sourceURL annotation, we assume
    that the line and column number that comes in via the protocol is
    in terms of the source text of the script.
(2) For inline <script>s without said annotation, we assume that the
    line and column numbers are in terms of the surrounding document.

This is finally aligned with how the DevTools front-end operates.

Fixed: chromium:1319828
Change-Id: I98c4ef04b34a97caf060ff4f32690b135edb6ee6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3610622
Reviewed-by: Kim-Anh Tran <kimanh@chromium.org>
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Kim-Anh Tran <kimanh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80292}
10 files changed
tree: 9850a59cc900977ea789411a0b8a7239ae571167
  1. .github/
  2. bazel/
  3. build_overrides/
  4. custom_deps/
  5. docs/
  6. gni/
  7. include/
  8. infra/
  9. samples/
  10. src/
  11. test/
  12. testing/
  13. third_party/
  14. tools/
  15. .bazelrc
  16. .clang-format
  17. .clang-tidy
  18. .editorconfig
  19. .flake8
  20. .git-blame-ignore-revs
  21. .gitattributes
  22. .gitignore
  23. .gn
  24. .mailmap
  25. .style.yapf
  26. .vpython
  27. .vpython3
  28. .ycm_extra_conf.py
  29. AUTHORS
  30. BUILD.bazel
  31. BUILD.gn
  32. CODE_OF_CONDUCT.md
  33. codereview.settings
  34. COMMON_OWNERS
  35. DEPS
  36. DIR_METADATA
  37. ENG_REVIEW_OWNERS
  38. INFRA_OWNERS
  39. INTL_OWNERS
  40. LICENSE
  41. LICENSE.fdlibm
  42. LICENSE.strongtalk
  43. LICENSE.v8
  44. LOONG_OWNERS
  45. MIPS_OWNERS
  46. OWNERS
  47. PPC_OWNERS
  48. PRESUBMIT.py
  49. README.md
  50. RISCV_OWNERS
  51. S390_OWNERS
  52. WATCHLISTS
  53. WORKSPACE
README.md

V8 JavaScript Engine

V8 is Google's open source JavaScript engine.

V8 implements ECMAScript as specified in ECMA-262.

V8 is written in C++ and is used in Google Chrome, the open source browser from Google.

V8 can run standalone, or can be embedded into any C++ application.

V8 Project page: https://v8.dev/docs

Getting the Code

Checkout depot tools, and run

    fetch v8

This will checkout V8 into the directory v8 and fetch all of its dependencies. To stay up to date, run

    git pull origin
    gclient sync

For fetching all branches, add the following into your remote configuration in .git/config:

    fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*
    fetch = +refs/tags/*:refs/tags/*

Contributing

Please follow the instructions mentioned at v8.dev/docs/contribute.