382 lines
17 KiB
Diff
382 lines
17 KiB
Diff
This patch adds support for the FreeBSD kernel specific printf format
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specifiers: %b, %D, %r and %y, via a new __freebsd_kprintf__ format
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string type.
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Sent upstream as http://reviews.llvm.org/D7154
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Index: tools/clang/include/clang/Analysis/Analyses/FormatString.h
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===================================================================
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--- tools/clang/include/clang/Analysis/Analyses/FormatString.h
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+++ tools/clang/include/clang/Analysis/Analyses/FormatString.h
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@@ -161,6 +161,12 @@ class ConversionSpecifier {
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ObjCObjArg, // '@'
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ObjCBeg = ObjCObjArg, ObjCEnd = ObjCObjArg,
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+ // FreeBSD kernel specific specifiers.
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+ FreeBSDbArg,
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+ FreeBSDDArg,
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+ FreeBSDrArg,
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+ FreeBSDyArg,
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+
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// GlibC specific specifiers.
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PrintErrno, // 'm'
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@@ -204,7 +210,8 @@ class ConversionSpecifier {
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return EndScanList ? EndScanList - Position : 1;
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}
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- bool isIntArg() const { return kind >= IntArgBeg && kind <= IntArgEnd; }
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+ bool isIntArg() const { return (kind >= IntArgBeg && kind <= IntArgEnd) ||
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+ kind == FreeBSDrArg || kind == FreeBSDyArg; }
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bool isUIntArg() const { return kind >= UIntArgBeg && kind <= UIntArgEnd; }
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bool isAnyIntArg() const { return kind >= IntArgBeg && kind <= UIntArgEnd; }
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const char *toString() const;
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@@ -646,7 +653,7 @@ class FormatStringHandler {
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bool ParsePrintfString(FormatStringHandler &H,
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const char *beg, const char *end, const LangOptions &LO,
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- const TargetInfo &Target);
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+ const TargetInfo &Target, bool isFreeBSDKPrintf);
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bool ParseFormatStringHasSArg(const char *beg, const char *end, const LangOptions &LO,
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const TargetInfo &Target);
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Index: tools/clang/include/clang/Sema/Sema.h
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===================================================================
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--- tools/clang/include/clang/Sema/Sema.h
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+++ tools/clang/include/clang/Sema/Sema.h
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@@ -8566,6 +8566,7 @@ class Sema {
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FST_Strftime,
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FST_Strfmon,
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FST_Kprintf,
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+ FST_FreeBSDKPrintf,
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FST_Unknown
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};
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static FormatStringType GetFormatStringType(const FormatAttr *Format);
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Index: tools/clang/lib/Analysis/FormatString.cpp
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===================================================================
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--- tools/clang/lib/Analysis/FormatString.cpp
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+++ tools/clang/lib/Analysis/FormatString.cpp
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@@ -552,6 +552,12 @@ const char *ConversionSpecifier::toString() const
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// Objective-C specific specifiers.
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case ObjCObjArg: return "@";
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+ // FreeBSD kernel specific specifiers.
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+ case FreeBSDbArg: return "b";
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+ case FreeBSDDArg: return "D";
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+ case FreeBSDrArg: return "r";
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+ case FreeBSDyArg: return "y";
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+
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// GlibC specific specifiers.
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case PrintErrno: return "m";
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@@ -647,6 +653,9 @@ bool FormatSpecifier::hasValidLengthModifier(const
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case ConversionSpecifier::XArg:
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case ConversionSpecifier::nArg:
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return true;
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+ case ConversionSpecifier::FreeBSDrArg:
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+ case ConversionSpecifier::FreeBSDyArg:
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+ return Target.getTriple().isOSFreeBSD();
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default:
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return false;
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}
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@@ -677,6 +686,9 @@ bool FormatSpecifier::hasValidLengthModifier(const
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case ConversionSpecifier::ScanListArg:
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case ConversionSpecifier::ZArg:
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return true;
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+ case ConversionSpecifier::FreeBSDrArg:
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+ case ConversionSpecifier::FreeBSDyArg:
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+ return Target.getTriple().isOSFreeBSD();
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default:
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return false;
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}
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@@ -807,6 +819,10 @@ bool FormatSpecifier::hasStandardConversionSpecifi
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case ConversionSpecifier::SArg:
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return LangOpt.ObjC1 || LangOpt.ObjC2;
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case ConversionSpecifier::InvalidSpecifier:
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+ case ConversionSpecifier::FreeBSDbArg:
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+ case ConversionSpecifier::FreeBSDDArg:
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+ case ConversionSpecifier::FreeBSDrArg:
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+ case ConversionSpecifier::FreeBSDyArg:
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case ConversionSpecifier::PrintErrno:
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case ConversionSpecifier::DArg:
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case ConversionSpecifier::OArg:
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Index: tools/clang/lib/Analysis/PrintfFormatString.cpp
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===================================================================
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--- tools/clang/lib/Analysis/PrintfFormatString.cpp
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+++ tools/clang/lib/Analysis/PrintfFormatString.cpp
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@@ -55,7 +55,8 @@ static PrintfSpecifierResult ParsePrintfSpecifier(
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unsigned &argIndex,
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const LangOptions &LO,
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const TargetInfo &Target,
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- bool Warn) {
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+ bool Warn,
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+ bool isFreeBSDKPrintf) {
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using namespace clang::analyze_format_string;
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using namespace clang::analyze_printf;
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@@ -206,9 +207,24 @@ static PrintfSpecifierResult ParsePrintfSpecifier(
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case '@': k = ConversionSpecifier::ObjCObjArg; break;
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// Glibc specific.
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case 'm': k = ConversionSpecifier::PrintErrno; break;
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+ // FreeBSD kernel specific.
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+ case 'b':
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+ if (isFreeBSDKPrintf)
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+ k = ConversionSpecifier::FreeBSDbArg; // int followed by char *
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+ break;
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+ case 'r':
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+ if (isFreeBSDKPrintf)
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+ k = ConversionSpecifier::FreeBSDrArg; // int
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+ break;
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+ case 'y':
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+ if (isFreeBSDKPrintf)
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+ k = ConversionSpecifier::FreeBSDyArg; // int
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+ break;
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// Apple-specific.
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case 'D':
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- if (Target.getTriple().isOSDarwin())
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+ if (isFreeBSDKPrintf)
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+ k = ConversionSpecifier::FreeBSDDArg; // void * followed by char *
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+ else if (Target.getTriple().isOSDarwin())
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k = ConversionSpecifier::DArg;
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break;
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case 'O':
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@@ -228,6 +244,10 @@ static PrintfSpecifierResult ParsePrintfSpecifier(
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FS.setConversionSpecifier(CS);
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if (CS.consumesDataArgument() && !FS.usesPositionalArg())
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FS.setArgIndex(argIndex++);
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+ // FreeBSD kernel specific.
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+ if (k == ConversionSpecifier::FreeBSDbArg ||
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+ k == ConversionSpecifier::FreeBSDDArg)
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+ argIndex++;
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if (k == ConversionSpecifier::InvalidSpecifier) {
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// Assume the conversion takes one argument.
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@@ -240,7 +260,8 @@ bool clang::analyze_format_string::ParsePrintfStri
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const char *I,
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const char *E,
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const LangOptions &LO,
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- const TargetInfo &Target) {
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+ const TargetInfo &Target,
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+ bool isFreeBSDKPrintf) {
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unsigned argIndex = 0;
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@@ -247,7 +268,8 @@ bool clang::analyze_format_string::ParsePrintfStri
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// Keep looking for a format specifier until we have exhausted the string.
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while (I != E) {
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const PrintfSpecifierResult &FSR = ParsePrintfSpecifier(H, I, E, argIndex,
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- LO, Target, true);
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+ LO, Target, true,
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+ isFreeBSDKPrintf);
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// Did a fail-stop error of any kind occur when parsing the specifier?
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// If so, don't do any more processing.
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if (FSR.shouldStop())
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@@ -276,7 +298,8 @@ bool clang::analyze_format_string::ParseFormatStri
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FormatStringHandler H;
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while (I != E) {
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const PrintfSpecifierResult &FSR = ParsePrintfSpecifier(H, I, E, argIndex,
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- LO, Target, false);
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+ LO, Target, false,
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+ false);
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// Did a fail-stop error of any kind occur when parsing the specifier?
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// If so, don't do any more processing.
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if (FSR.shouldStop())
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@@ -674,6 +697,8 @@ bool PrintfSpecifier::hasValidPlusPrefix() const {
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case ConversionSpecifier::GArg:
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case ConversionSpecifier::aArg:
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case ConversionSpecifier::AArg:
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+ case ConversionSpecifier::FreeBSDrArg:
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+ case ConversionSpecifier::FreeBSDyArg:
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return true;
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default:
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@@ -699,6 +724,8 @@ bool PrintfSpecifier::hasValidAlternativeForm() co
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case ConversionSpecifier::FArg:
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case ConversionSpecifier::gArg:
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case ConversionSpecifier::GArg:
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+ case ConversionSpecifier::FreeBSDrArg:
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+ case ConversionSpecifier::FreeBSDyArg:
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return true;
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default:
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@@ -729,6 +756,8 @@ bool PrintfSpecifier::hasValidLeadingZeros() const
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case ConversionSpecifier::FArg:
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case ConversionSpecifier::gArg:
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case ConversionSpecifier::GArg:
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+ case ConversionSpecifier::FreeBSDrArg:
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+ case ConversionSpecifier::FreeBSDyArg:
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return true;
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default:
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@@ -753,6 +782,8 @@ bool PrintfSpecifier::hasValidSpacePrefix() const
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case ConversionSpecifier::GArg:
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case ConversionSpecifier::aArg:
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case ConversionSpecifier::AArg:
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+ case ConversionSpecifier::FreeBSDrArg:
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+ case ConversionSpecifier::FreeBSDyArg:
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return true;
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default:
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@@ -818,6 +849,8 @@ bool PrintfSpecifier::hasValidPrecision() const {
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case ConversionSpecifier::gArg:
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case ConversionSpecifier::GArg:
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case ConversionSpecifier::sArg:
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+ case ConversionSpecifier::FreeBSDrArg:
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+ case ConversionSpecifier::FreeBSDyArg:
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return true;
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default:
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Index: tools/clang/lib/Sema/SemaChecking.cpp
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===================================================================
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--- tools/clang/lib/Sema/SemaChecking.cpp
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+++ tools/clang/lib/Sema/SemaChecking.cpp
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@@ -2584,6 +2584,7 @@ Sema::FormatStringType Sema::GetFormatStringType(c
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.Case("strftime", FST_Strftime)
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.Case("strfmon", FST_Strfmon)
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.Cases("kprintf", "cmn_err", "vcmn_err", "zcmn_err", FST_Kprintf)
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+ .Case("freebsd_kprintf", FST_FreeBSDKPrintf)
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.Default(FST_Unknown);
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}
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@@ -3365,6 +3366,43 @@ CheckPrintfHandler::HandlePrintfSpecifier(const an
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CoveredArgs.set(argIndex);
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}
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+ // FreeBSD kernel extensions.
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+ if (CS.getKind() == ConversionSpecifier::FreeBSDbArg ||
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+ CS.getKind() == ConversionSpecifier::FreeBSDDArg) {
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+ // We need at least two arguments.
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+ if (!CheckNumArgs(FS, CS, startSpecifier, specifierLen, argIndex + 1))
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+ return false;
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+
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+ // Claim the second argument.
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+ CoveredArgs.set(argIndex + 1);
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+
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+ // Type check the first argument (int for %b, pointer for %D)
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+ const Expr *Ex = getDataArg(argIndex);
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+ const analyze_printf::ArgType &AT =
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+ (CS.getKind() == ConversionSpecifier::FreeBSDbArg) ?
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+ ArgType(S.Context.IntTy) : ArgType::CPointerTy;
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+ if (AT.isValid() && !AT.matchesType(S.Context, Ex->getType()))
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+ EmitFormatDiagnostic(
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+ S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
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+ << AT.getRepresentativeTypeName(S.Context) << Ex->getType()
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+ << false << Ex->getSourceRange(),
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+ Ex->getLocStart(), /*IsStringLocation*/false,
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+ getSpecifierRange(startSpecifier, specifierLen));
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+
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+ // Type check the second argument (char * for both %b and %D)
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+ Ex = getDataArg(argIndex + 1);
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+ const analyze_printf::ArgType &AT2 = ArgType::CStrTy;
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+ if (AT2.isValid() && !AT2.matchesType(S.Context, Ex->getType()))
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+ EmitFormatDiagnostic(
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+ S.PDiag(diag::warn_format_conversion_argument_type_mismatch)
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+ << AT2.getRepresentativeTypeName(S.Context) << Ex->getType()
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+ << false << Ex->getSourceRange(),
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+ Ex->getLocStart(), /*IsStringLocation*/false,
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+ getSpecifierRange(startSpecifier, specifierLen));
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+
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+ return true;
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+ }
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+
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// Check for using an Objective-C specific conversion specifier
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// in a non-ObjC literal.
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if (!ObjCContext && CS.isObjCArg()) {
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@@ -3988,7 +4026,8 @@ void Sema::CheckFormatString(const StringLiteral *
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return;
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}
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- if (Type == FST_Printf || Type == FST_NSString) {
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+ if (Type == FST_Printf || Type == FST_NSString ||
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+ Type == FST_FreeBSDKPrintf) {
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CheckPrintfHandler H(*this, FExpr, OrigFormatExpr, firstDataArg,
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numDataArgs, (Type == FST_NSString),
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Str, HasVAListArg, Args, format_idx,
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@@ -3996,7 +4035,8 @@ void Sema::CheckFormatString(const StringLiteral *
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if (!analyze_format_string::ParsePrintfString(H, Str, Str + StrLen,
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getLangOpts(),
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- Context.getTargetInfo()))
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+ Context.getTargetInfo(),
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+ Type == FST_FreeBSDKPrintf))
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H.DoneProcessing();
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} else if (Type == FST_Scanf) {
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CheckScanfHandler H(*this, FExpr, OrigFormatExpr, firstDataArg, numDataArgs,
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Index: tools/clang/lib/Sema/SemaDeclAttr.cpp
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===================================================================
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--- tools/clang/lib/Sema/SemaDeclAttr.cpp
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+++ tools/clang/lib/Sema/SemaDeclAttr.cpp
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@@ -2481,6 +2481,7 @@ static FormatAttrKind getFormatAttrKind(StringRef
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.Cases("scanf", "printf", "printf0", "strfmon", SupportedFormat)
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.Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
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.Case("kprintf", SupportedFormat) // OpenBSD.
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+ .Case("freebsd_kprintf", SupportedFormat) // FreeBSD.
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.Cases("gcc_diag", "gcc_cdiag", "gcc_cxxdiag", "gcc_tdiag", IgnoredFormat)
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.Default(InvalidFormat);
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Index: tools/clang/test/Sema/attr-format.c
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===================================================================
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--- tools/clang/test/Sema/attr-format.c
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+++ tools/clang/test/Sema/attr-format.c
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@@ -57,8 +57,15 @@ void callnull(void){
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null(0, (int*)0); // expected-warning {{incompatible pointer types}}
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}
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+// FreeBSD kernel extensions
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+void a3(const char *a, ...) __attribute__((format(freebsd_kprintf, 1,2))); // no-error
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+void b3(const char *a, ...) __attribute__((format(freebsd_kprintf, 1,1))); // expected-error {{'format' attribute parameter 3 is out of bounds}}
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+void c3(const char *a, ...) __attribute__((format(freebsd_kprintf, 0,2))); // expected-error {{'format' attribute parameter 2 is out of bounds}}
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+void d3(const char *a, int c) __attribute__((format(freebsd_kprintf, 1,2))); // expected-error {{format attribute requires variadic function}}
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+void e3(char *str, int c, ...) __attribute__((format(freebsd_kprintf, 2,3))); // expected-error {{format argument not a string type}}
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+
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// PR4470
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int xx_vprintf(const char *, va_list);
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Index: tools/clang/test/Sema/format-strings-freebsd.c
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===================================================================
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--- tools/clang/test/Sema/format-strings-freebsd.c
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+++ tools/clang/test/Sema/format-strings-freebsd.c
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@@ -0,0 +1,40 @@
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+// RUN: %clang_cc1 -fsyntax-only -verify -triple i386-unknown-freebsd %s
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+// RUN: %clang_cc1 -fsyntax-only -verify -triple x86_64-unknown-freebsd %s
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+
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+// Test FreeBSD kernel printf extensions.
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+int freebsd_kernel_printf(const char *, ...) __attribute__((__format__(__freebsd_kprintf__, 1, 2)));
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+
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+void check_freebsd_kernel_extensions(int i, long l, char *s)
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+{
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+ // %b expects an int and a char *
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+ freebsd_kernel_printf("reg=%b\n", i, "\10\2BITTWO\1BITONE\n"); // no-warning
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+ freebsd_kernel_printf("reg=%b\n", l, "\10\2BITTWO\1BITONE\n"); // expected-warning{{format specifies type 'int' but the argument has type 'long'}}
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+ freebsd_kernel_printf("reg=%b\n", i, l); // expected-warning{{format specifies type 'char *' but the argument has type 'long'}}
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+ freebsd_kernel_printf("reg=%b\n", i); // expected-warning{{more '%' conversions than data arguments}}
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+ 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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+
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+ // %D expects an unsigned char * and a char *
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+ freebsd_kernel_printf("%6D", s, ":"); // no-warning
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+ freebsd_kernel_printf("%6D", i, ":"); // expected-warning{{format specifies type 'void *' but the argument has type 'int'}}
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+ freebsd_kernel_printf("%6D", s, i); // expected-warning{{format specifies type 'char *' but the argument has type 'int'}}
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+ freebsd_kernel_printf("%6D", s); // expected-warning{{more '%' conversions than data arguments}}
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+ freebsd_kernel_printf("%6D", s, ":", i); // expected-warning{{data argument not used by format string}}
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+
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+ freebsd_kernel_printf("%*D", 42, s, ":"); // no-warning
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+ freebsd_kernel_printf("%*D", 42, i, ":"); // expected-warning{{format specifies type 'void *' but the argument has type 'int'}}
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+ freebsd_kernel_printf("%*D", 42, s, i); // expected-warning{{format specifies type 'char *' but the argument has type 'int'}}
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+ freebsd_kernel_printf("%*D", 42, s); // expected-warning{{more '%' conversions than data arguments}}
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+ freebsd_kernel_printf("%*D", 42, s, ":", i); // expected-warning{{data argument not used by format string}}
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+
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+ // %r expects an int
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+ freebsd_kernel_printf("%r", i); // no-warning
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+ freebsd_kernel_printf("%r", l); // expected-warning{{format specifies type 'int' but the argument has type 'long'}}
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+ freebsd_kernel_printf("%lr", i); // expected-warning{{format specifies type 'long' but the argument has type 'int'}}
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+ freebsd_kernel_printf("%lr", l); // no-warning
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+
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+ // %y expects an int
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+ freebsd_kernel_printf("%y", i); // no-warning
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+ freebsd_kernel_printf("%y", l); // expected-warning{{format specifies type 'int' but the argument has type 'long'}}
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+ freebsd_kernel_printf("%ly", i); // expected-warning{{format specifies type 'long' but the argument has type 'int'}}
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+ freebsd_kernel_printf("%ly", l); // no-warning
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+}
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