https://github.com/brad0 updated
https://github.com/llvm/llvm-project/pull/120689
>From db61e7cc93b93bfa4ea19b274532f562b3c0a9a6 Mon Sep 17 00:00:00 2001
From: Brad Smith <b...@comstyle.com>
Date: Thu, 19 Dec 2024 21:35:57 -0500
Subject: [PATCH] [clang][Sema] Fixes for %b printf extension handling
The %b printf extension in the kernel is not fixed to a int type. On
sparc64 there are various %llb formats. Adjust the code to handle the
length specifiers and type check like it is used by the regular case.
---
clang/lib/Sema/SemaChecking.cpp | 38 +++++++++++++++++-------
clang/test/Sema/format-strings-freebsd.c | 1 -
2 files changed, 27 insertions(+), 12 deletions(-)
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index e703a62ff9cf18..e50118762fff32 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -7170,18 +7170,34 @@ bool CheckPrintfHandler::HandlePrintfSpecifier(
// Claim the second argument.
CoveredArgs.set(argIndex + 1);
- // Type check the first argument (int for %b, pointer for %D)
const Expr *Ex = getDataArg(argIndex);
- const analyze_printf::ArgType &AT =
- (CS.getKind() == ConversionSpecifier::FreeBSDbArg) ?
- ArgType(S.Context.IntTy) : ArgType::CPointerTy;
- if (AT.isValid() && !AT.matchesType(S.Context, Ex->getType()))
- EmitFormatDiagnostic(
- S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
- << AT.getRepresentativeTypeName(S.Context) << Ex->getType()
- << false << Ex->getSourceRange(),
- Ex->getBeginLoc(), /*IsStringLocation*/ false,
- getSpecifierRange(startSpecifier, specifierLen));
+ if (CS.getKind() == ConversionSpecifier::FreeBSDDArg) {
+ // Type check the first argument (pointer for %D)
+ const analyze_printf::ArgType &AT = ArgType::CPointerTy;
+ if (AT.isValid() && !AT.matchesType(S.Context, Ex->getType()))
+ EmitFormatDiagnostic(
+ S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
+ << AT.getRepresentativeTypeName(S.Context) << Ex->getType()
+ << false << Ex->getSourceRange(),
+ Ex->getBeginLoc(), /*IsStringLocation*/ false,
+ getSpecifierRange(startSpecifier, specifierLen));
+ } else {
+ // Check the length modifier for %b
+ if (!FS.hasValidLengthModifier(S.getASTContext().getTargetInfo(),
+ S.getLangOpts()))
+ HandleInvalidLengthModifier(FS, CS, startSpecifier, specifierLen,
+ diag::warn_format_nonsensical_length);
+ else if (!FS.hasStandardLengthModifier())
+ HandleNonStandardLengthModifier(FS, startSpecifier, specifierLen);
+ else if (!FS.hasStandardLengthConversionCombination())
+ HandleInvalidLengthModifier(
+ FS, CS, startSpecifier, specifierLen,
+ diag::warn_format_non_standard_conversion_spec);
+
+ // Type check the first argument of %b
+ if (!checkFormatExpr(FS, startSpecifier, specifierLen, Ex))
+ return false;
+ }
// Type check the second argument (char * for both %b and %D)
Ex = getDataArg(argIndex + 1);
diff --git a/clang/test/Sema/format-strings-freebsd.c
b/clang/test/Sema/format-strings-freebsd.c
index 3d3ed6b40f48dc..ce24855b409c90 100644
--- a/clang/test/Sema/format-strings-freebsd.c
+++ b/clang/test/Sema/format-strings-freebsd.c
@@ -10,7 +10,6 @@ void check_freebsd_kernel_extensions(int i, long l, char *s,
short h)
{
// %b expects an int and a char *
freebsd_kernel_printf("reg=%b\n", i, "\10\2BITTWO\1BITONE\n"); // no-warning
- freebsd_kernel_printf("reg=%b\n", l, "\10\2BITTWO\1BITONE\n"); //
expected-warning{{format specifies type 'int' but the argument has type 'long'}}
freebsd_kernel_printf("reg=%b\n", i, l); // expected-warning{{format
specifies type 'char *' but the argument has type 'long'}}
freebsd_kernel_printf("reg=%b\n", i); // expected-warning{{more '%'
conversions than data arguments}}
freebsd_kernel_printf("reg=%b\n", i, "\10\2BITTWO\1BITONE\n", l); //
expected-warning{{data argument not used by format string}}
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