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cc1: Report an error for multiple actions unless separated by -main-file-name #91140

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Merged
merged 2 commits into from
May 7, 2024
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cc1: Report an error for multiple actions unless separated by -main-file-name #91140

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c867733
[𝘀𝗽𝗿] initial version
MaskRay May 5, 2024
3099ab6
rebase on -analyze fixes: e4d242768aefabc0091dd01fabecaffbc2b6984b
MaskRay May 6, 2024
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2 changes: 2 additions & 0 deletions clang/include/clang/Basic/DiagnosticFrontendKinds.td
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,8 @@ def err_fe_no_pch_in_dir : Error<
"no suitable precompiled header file found in directory '%0'">;
def err_fe_action_not_available : Error<
"action %0 not compiled in">;
def err_fe_invalid_multiple_actions : Error<
"'%0' action ignored; '%1' action specified previously">;
def err_fe_invalid_alignment : Error<
"invalid value '%1' in '%0'; alignment must be a power of 2">;
def err_fe_invalid_exception_model
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24 changes: 24 additions & 0 deletions clang/lib/Frontend/CompilerInvocation.cpp
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Expand Up @@ -2841,6 +2841,30 @@ static bool ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
}

Opts.ProgramAction = *ProgramAction;

// Catch common mistakes when multiple actions are specified for cc1 (e.g.
// -S -emit-llvm means -emit-llvm while -emit-llvm -S means -S). However, to
// support driver `-c -Xclang ACTION` (-cc1 -emit-llvm file -main-file-name
// X ACTION), we suppress the error when the two actions are separated by
// -main-file-name.
//
// As an exception, accept composable -ast-dump*.
if (!A->getSpelling().starts_with("-ast-dump")) {
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Any reason why use string-based prefix instead of checking for the OPT_ enums?

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-ast-dump -ast-dump-lookups and -ast-dump-lookups -ast-dump are composable. llvm/utils/update_cc_test_checks.py appends -ast-dump=json when the cc1 command line may contain another action option.

Since there are 3+ -ast-dump* options that need an exception, I feel that starts_with("-ast-dump")) is simpler than listing all OPT_ast_dump*..

const Arg *SavedAction = nullptr;
for (const Arg *AA :
Args.filtered(OPT_Action_Group, OPT_main_file_name)) {
if (AA->getOption().matches(OPT_main_file_name)) {
SavedAction = nullptr;
} else if (!SavedAction) {
SavedAction = AA;
} else {
if (!A->getOption().matches(OPT_ast_dump_EQ))
Diags.Report(diag::err_fe_invalid_multiple_actions)
<< SavedAction->getSpelling() << A->getSpelling();
break;
}
}
}
}

if (const Arg* A = Args.getLastArg(OPT_plugin)) {
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7 changes: 7 additions & 0 deletions clang/test/Frontend/multiple-actions.c
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@@ -0,0 +1,7 @@
// RUN: not %clang_cc1 -S -emit-llvm -main-file-name %s 2>&1 | FileCheck %s --check-prefix=ERR1 --implicit-check-not=error:
// ERR1: error: '-S' action ignored; '-emit-llvm' action specified previously

// RUN: not %clang_cc1 -main-file-name %s -emit-llvm-only -emit-llvm -S 2>&1 | FileCheck %s --check-prefix=ERR2 --implicit-check-not=error:
// ERR2: error: '-emit-llvm-only' action ignored; '-S' action specified previously

// RUN: %clang_cc1 -S -main-file-name %s -emit-llvm -o /dev/null
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