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It's currently ambiguous in IR whether the source language explicitly did not want a stack a stack protector (in C, via function attribute no_stack_protector) or doesn't care for any given function. It's common for code that manipulates the stack via inline assembly or that has to set up its own stack canary (such as the Linux kernel) would like to avoid stack protectors in certain functions. In this case, we've been bitten by numerous bugs where a callee with a stack protector is inlined into an __attribute__((__no_stack_protector__)) caller, which generally breaks the caller's assumptions about not having a stack protector. LTO exacerbates the issue. While developers can avoid this by putting all no_stack_protector functions in one translation unit together and compiling those with -fno-stack-protector, it's generally not very ergonomic or as ergonomic as a function attribute, and still doesn't work for LTO. See also: https://lore.kernel.org/linux-pm/20200915172658.1432732-1-rkir@google.com/ https://lore.kernel.org/lkml/20200918201436.2932360-30-samitolvanen@google.com/T/#u Typically, when inlining a callee into a caller, the caller will be upgraded in its level of stack protection (see adjustCallerSSPLevel()). By adding an explicit attribute in the IR when the function attribute is used in the source language, we can now identify such cases and prevent inlining. Block inlining when the callee and caller differ in the case that one contains `nossp` when the other has `ssp`, `sspstrong`, or `sspreq`. Fixes pr/47479. Reviewed By: void Differential Revision: https://reviews.llvm.org/D87956 |
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| src | ||
| syntaxes | ||
| .gitignore | ||
| .vscodeignore | ||
| CHANGELOG.md | ||
| language-configuration-tablegen.json | ||
| language-configuration.json | ||
| package-lock.json | ||
| package.json | ||
| README.md | ||
| tsconfig.json | ||
| vsc-extension-quickstart.md | ||
VS Code Extension For LLVM Dev
Features
- LLVM IR files (.ll) syntax highlighting.
(manually translated from
llvm/utils/vim/syntax/llvm.vim) - TableGen files (.td) syntax highlighting.
(translated from
llvm/utils/textmate) - PatternMatchers for LIT test output.
(
$llvm-lit,$llvm-filecheck) - Tasks to run LIT on current selected file.
(
Terminal->Run Task->llvm-lit)
Installation
sudo apt-get install nodejs-dev node-gyp npm
sudo npm install -g typescript npx vsce
Install From Source
cd <extensions-installation-folder>
cp -r llvm/utils/vscode/llvm .
cd llvm
npm install
npm run vscode:prepublish
<extensions-installation-folder> is OS dependent.
Please refer to https://code.visualstudio.com/docs/editor/extension-gallery#_where-are-extensions-installed
Install From Package (.vsix)
First package the extension according to https://code.visualstudio.com/api/working-with-extensions/publishing-extension#usage.
Then install the package according to https://code.visualstudio.com/docs/editor/extension-gallery#_install-from-a-vsix.
Setup
Set cmake.buildDirectory to your build directory.
https://code.visualstudio.com/docs/getstarted/settings
https://vector-of-bool.github.io/docs/vscode-cmake-tools/settings.html#cmake-builddirectory