[Driver] Reject -mcmodel=tiny on X86 #125643
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@llvm/pr-subscribers-clang-driver @llvm/pr-subscribers-clang Author: None (ShashwathiNavada) ChangesThe mcmodel=tiny memory model is only valid on ARM targets. While trying this on X86 compiler throws an internal error along with stack dump. #125641 Full diff: https://github.com/llvm/llvm-project/pull/125643.diff 1 Files Affected:
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 11fd6ab7f52a795..ac8d8be572012bb 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -1897,6 +1897,15 @@ bool CompilerInvocation::ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
Opts.setInlining(CodeGenOptions::NormalInlining);
}
+// -mcmodel option.
+if (const llvm::opt::Arg *A = Args.getLastArg(clang::driver::options::OPT_mcmodel_EQ))
+{
+ llvm::StringRef modelName = A->getValue();
+ if(modelName=="tiny" && !T.isARM())
+ Diags.Report(diag::err_drv_unsupported_option_argument_for_target)
+ << A->getSpelling() <<modelName<< T.getTriple();
+}
+
// PIC defaults to -fno-direct-access-external-data while non-PIC defaults to
// -fdirect-access-external-data.
Opts.DirectAccessExternalData =
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✅ With the latest revision this PR passed the C/C++ code formatter. |
ShashwathiNavada
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Can you add tests and a release note entry? Thanks! |
Thank you for the response! |
hstk30-hw
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llvmbot
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@cor3ntin I have addressed your comment. Could you please look into it. Thank you!! |
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ping @cor3ntin |
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ping @hstk30-hw |
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ping @cor3ntin @hstk30-hw |
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Hi, these is a pending review suggestion. Just put the test cast to exist test file, maybe like clang/test/Driver/mcmodel.c |
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| llvm::StringRef modelName = A->getValue(); | ||
| if (modelName == "tiny" && !(T.isARM() || T.isAArch64())) { | ||
| Diags.Report(diag::err_drv_unsupported_option_argument_for_target) | ||
| << A->getSpelling() << modelName << T.getTriple(); |
There was a problem hiding this comment.
Suggested change
| llvm::StringRef modelName = A->getValue(); | |
| if (modelName == "tiny" && !(T.isARM() || T.isAArch64())) { | |
| Diags.Report(diag::err_drv_unsupported_option_argument_for_target) | |
| << A->getSpelling() << modelName << T.getTriple(); | |
| StringRef ModelName = A->getValue(); | |
| if (ModelName == "tiny" && !(T.isARM() || T.isAArch64())) { | |
| Diags.Report(diag::err_drv_unsupported_option_argument_for_target) | |
| << A->getSpelling() << ModelName << T.getTriple(); |
Fixing for our coding style.
llvm/docs/ReleaseNotes.md
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| @@ -240,6 +240,9 @@ Changes to Sanitizers | |||
| Other Changes | |||
| ------------- | |||
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| * The -mcmodel=tiny option for the x86 architecture now triggers a frontend diagnostic. | |||
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Oops, this belongs in clang/docs/ReleaseNotes.rst rather than in LLVM (because this is changing diagnostic behavior of the Clang driver).
llvm/docs/ReleaseNotes.md
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| @@ -240,6 +240,9 @@ Changes to Sanitizers | |||
| Other Changes | |||
| ------------- | |||
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| * The -mcmodel=tiny option for the x86 architecture now triggers a frontend diagnostic. | |||
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Suggested change
| * The -mcmodel=tiny option for the x86 architecture now triggers a frontend diagnostic. | |
| * The ``-mcmodel=tiny`` option will now be diagnosed on all targets other than ARM or AArch64. |
clang/test/Driver/mcmodel.c
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| @@ -4,6 +4,7 @@ | |||
| // RUN: %clang --target=x86_64 -### -S -mcmodel=kernel %s 2>&1 | FileCheck --check-prefix=KERNEL %s | |||
| // RUN: %clang --target=x86_64 -### -c -mcmodel=medium %s 2>&1 | FileCheck --check-prefix=MEDIUM %s | |||
| // RUN: %clang --target=x86_64 -### -S -mcmodel=large %s 2>&1 | FileCheck --check-prefix=LARGE %s | |||
| // RUN: not %clang --target=x86_64 -c -mcmodel=tiny %s 2>&1 | FileCheck %s | |||
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What about Line 2 of this file? That seems like it would now start failing, right?
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Thanks for the response, I have modified the command.
Thanks for the response, I have made the changes in clang/lib/Driver |
clang/test/Driver/mcmodel.c
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| @@ -44,3 +44,5 @@ | |||
| // ERR-AARCH64_32: error: unsupported argument 'small' to option '-mcmodel=' for target 'aarch64_32-unknown-linux' | |||
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| // ERR-LOONGARCH64-PLT-EXTREME: error: invalid argument '-mcmodel=extreme' not allowed with '-fplt' | |||
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| // CHECK: error: unsupported argument 'tiny' to option '-mcmodel=' for target '{{.*}}' | |||
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We have nothing with a check prefix of just CHECK so this will never actually be tested. Also, this is the same message as ERR-TINY so we wouldn't need this line anyway.
MaskRay
reviewed
Apr 16, 2025
clang/lib/Driver/Driver.cpp
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| @@ -1755,6 +1755,18 @@ Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) { | |||
| << TC.getTriple().str(); | |||
| } | |||
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| // Throw diagnosis if mcmodel=tiny option is passed for targets other than ARM | |||
| // or AArch64. | |||
| if (Arg *A = UArgs->getLastArg(options::OPT_mcmodel_EQ)) { | |||
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Move to clang/lib/Driver/ToolChains/CommonArgs.cpp addMCModel. You might delete add an early return to that function and run check-clang-driver to find relevant tests. Then follow that style and add one for Arm.
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tiny is expected to work with AArch64.
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@MaskRay Thank you for your response!
I noticed that in the function you mentioned, there’s a check like this:
else if (Triple.getArch() == llvm::Triple::x86_64) {
Ok = llvm::is_contained({"small", "kernel", "medium", "large", "tiny"}, CM);
}
I found that removing the tiny option here gives the desired result.
Would you mind confirming if this approach looks good?
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ping @MaskRay |
MaskRay
reviewed
May 6, 2025
clang/docs/ReleaseNotes.rst
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| @@ -391,6 +391,7 @@ Improvements to Clang's diagnostics | |||
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| - An error is now emitted when a ``musttail`` call is made to a function marked with the ``not_tail_called`` attribute. (#GH133509). | |||
| - The ``-mcmodel=tiny`` option will now be diagnosed on all targets other than ARM or AArch64. | |||
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The commit message/description and the note should be changed. Only X86 is affected. This change is pretty niche and does not deserve a release note.
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@MaskRay, Thank you for the response. I have removed the release note entry and updated the commit message as well.
ShashwathiNavada
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MaskRay
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MaskRay
approved these changes
May 7, 2025
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This patch causes a test fail on I tested with build: |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/153/builds/31001 Here is the relevant piece of the build log for the reference |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/27305 Here is the relevant piece of the build log for the reference |
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Hi there, we would appreciate it if you could revert this PR while investigating. It breaks our buildbot and will block our downstream merge. |
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I put up #138959 which removes the offending |
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The mcmodel=tiny memory model is only valid on ARM targets. While trying this on X86 compiler throws an internal error along with stack dump. #125641
This patch resolves the issue.
Reduced test case: