[clang] Fix clang to recognize new C23 modifiers %w and %wf when printing (PR #71771)
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Wed Nov 8 21:18:25 PST 2023
https://github.com/ZijunZhaoCCK created https://github.com/llvm/llvm-project/pull/71771
None
>From 06c4cf02dfb4b20c8349c5f3c7209276f6d56edf Mon Sep 17 00:00:00 2001
From: zijunzhao <zijunzhao at google.com>
Date: Thu, 9 Nov 2023 02:21:46 +0000
Subject: [PATCH] Fix clang to recognize new C23 modifiers %w and %wf when
printing
---
clang/include/clang/AST/FormatString.h | 16 +++++++-
clang/lib/AST/FormatString.cpp | 52 +++++++++++++++++++++++++-
clang/lib/AST/PrintfFormatString.cpp | 19 ++++++++++
clang/test/Sema/format-strings-ms.c | 28 ++++++++++++++
4 files changed, 112 insertions(+), 3 deletions(-)
diff --git a/clang/include/clang/AST/FormatString.h b/clang/include/clang/AST/FormatString.h
index 5c4ad9baaef608c..6a886854650f1d9 100644
--- a/clang/include/clang/AST/FormatString.h
+++ b/clang/include/clang/AST/FormatString.h
@@ -81,8 +81,10 @@ class LengthModifier {
AsLongDouble, // 'L'
AsAllocate, // for '%as', GNU extension to C90 scanf
AsMAllocate, // for '%ms', GNU extension to scanf
- AsWide, // 'w' (MSVCRT, like l but only for c, C, s, S, or Z
- AsWideChar = AsLong // for '%ls', only makes sense for printf
+ AsWide, // 'w' (1. MSVCRT, like l but only for c, C, s, S, or Z on windows
+ // 2. for b, d, i, o, u, x, or X when a size followed(like 8, 16, 32 or 64)
+ AsWideFast, // 'wf' (for b, d, i, o, u, x, or X)
+ AsWideChar = AsLong, // for '%ls', only makes sense for printf
};
LengthModifier()
@@ -417,6 +419,7 @@ class FormatSpecifier {
/// http://www.opengroup.org/onlinepubs/009695399/functions/printf.html
bool UsesPositionalArg;
unsigned argIndex;
+ unsigned size;
public:
FormatSpecifier(bool isPrintf)
: CS(isPrintf), VectorNumElts(false),
@@ -460,6 +463,15 @@ class FormatSpecifier {
FieldWidth = Amt;
}
+ void setSize(unsigned s) {
+ size = s;
+ }
+
+ unsigned getSize() const {
+ return size;
+ }
+
+
bool usesPositionalArg() const { return UsesPositionalArg; }
bool hasValidLengthModifier(const TargetInfo &Target,
diff --git a/clang/lib/AST/FormatString.cpp b/clang/lib/AST/FormatString.cpp
index e0c9e18cfe3a243..ebc136e780717e4 100644
--- a/clang/lib/AST/FormatString.cpp
+++ b/clang/lib/AST/FormatString.cpp
@@ -286,7 +286,33 @@ clang::analyze_format_string::ParseLengthModifier(FormatSpecifier &FS,
lmKind = LengthModifier::AsInt3264;
break;
case 'w':
- lmKind = LengthModifier::AsWide; ++I; break;
+ ++I;
+ if (I == E) return false;
+ if (*I == 'f') {
+ lmKind = LengthModifier::AsWideFast;
+ ++I;
+ } else {
+ lmKind = LengthModifier::AsWide;
+ }
+
+ if (I == E) return false;
+ int s = 0;
+ while (unsigned(*I - '0') <= 9) {
+ s = 10 * s + unsigned(*I - '0');
+ ++I;
+ }
+
+ // s == 0 is MSVCRT case, like l but only for c, C, s, S, or Z on windows
+ // s != 0 for b, d, i, o, u, x, or X when a size followed(like 8, 16, 32 or 64)
+ if (s != 0) {
+ std::set<int> supported_list {8, 16, 32, 64};
+ if (supported_list.count(s) == 0) {
+ return false;
+ }
+ FS.setSize(s);
+ }
+
+ break;
}
LengthModifier lm(lmPosition, lmKind);
FS.setLengthModifier(lm);
@@ -703,6 +729,8 @@ analyze_format_string::LengthModifier::toString() const {
return "m";
case AsWide:
return "w";
+ case AsWideFast:
+ return "wf";
case None:
return "";
}
@@ -970,6 +998,27 @@ bool FormatSpecifier::hasValidLengthModifier(const TargetInfo &Target,
case ConversionSpecifier::SArg:
case ConversionSpecifier::ZArg:
return Target.getTriple().isOSMSVCRT();
+ case ConversionSpecifier::bArg:
+ case ConversionSpecifier::dArg:
+ case ConversionSpecifier::iArg:
+ case ConversionSpecifier::oArg:
+ case ConversionSpecifier::uArg:
+ case ConversionSpecifier::xArg:
+ case ConversionSpecifier::XArg:
+ return true;
+ default:
+ return false;
+ }
+ case LengthModifier::AsWideFast:
+ switch (CS.getKind()) {
+ case ConversionSpecifier::bArg:
+ case ConversionSpecifier::dArg:
+ case ConversionSpecifier::iArg:
+ case ConversionSpecifier::oArg:
+ case ConversionSpecifier::uArg:
+ case ConversionSpecifier::xArg:
+ case ConversionSpecifier::XArg:
+ return true;
default:
return false;
}
@@ -996,6 +1045,7 @@ bool FormatSpecifier::hasStandardLengthModifier() const {
case LengthModifier::AsInt3264:
case LengthModifier::AsInt64:
case LengthModifier::AsWide:
+ case LengthModifier::AsWideFast:
case LengthModifier::AsShortLong: // ???
return false;
}
diff --git a/clang/lib/AST/PrintfFormatString.cpp b/clang/lib/AST/PrintfFormatString.cpp
index f0b9d0ecaf23461..4b9111e8bcf509a 100644
--- a/clang/lib/AST/PrintfFormatString.cpp
+++ b/clang/lib/AST/PrintfFormatString.cpp
@@ -537,7 +537,16 @@ ArgType PrintfSpecifier::getScalarArgType(ASTContext &Ctx,
ArgType(Ctx.getPointerDiffType(), "ptrdiff_t"));
case LengthModifier::AsAllocate:
case LengthModifier::AsMAllocate:
+ return ArgType::Invalid();
case LengthModifier::AsWide:
+ case LengthModifier::AsWideFast:
+ int s = getSize();
+ bool fast = LM.getKind() == LengthModifier::AsWideFast ? true : false;
+ ArgType fastType = Ctx.getTargetInfo().getTriple().isArch64Bit() ? Ctx.LongLongTy : Ctx.IntTy;
+ if (s == 8) return Ctx.CharTy;
+ if (s == 16) return fast? fastType : Ctx.ShortTy;
+ if (s == 32) return fast? fastType : Ctx.IntTy;
+ if (s == 64) return Ctx.LongLongTy;
return ArgType::Invalid();
}
@@ -572,7 +581,16 @@ ArgType PrintfSpecifier::getScalarArgType(ASTContext &Ctx,
ArgType(Ctx.getUnsignedPointerDiffType(), "unsigned ptrdiff_t"));
case LengthModifier::AsAllocate:
case LengthModifier::AsMAllocate:
+ return ArgType::Invalid();
case LengthModifier::AsWide:
+ case LengthModifier::AsWideFast:
+ int s = getSize();
+ bool fast = LM.getKind() == LengthModifier::AsWideFast ? true : false;
+ ArgType fastType = Ctx.getTargetInfo().getTriple().isArch64Bit() ? Ctx.UnsignedLongLongTy : Ctx.UnsignedIntTy;
+ if (s == 8) return Ctx.UnsignedCharTy;
+ if (s == 16) return fast? fastType : Ctx.UnsignedShortTy;
+ if (s == 32) return fast? fastType : Ctx.UnsignedIntTy;
+ if (s == 64) return Ctx.UnsignedLongLongTy;
return ArgType::Invalid();
}
@@ -621,6 +639,7 @@ ArgType PrintfSpecifier::getScalarArgType(ASTContext &Ctx,
case LengthModifier::AsInt3264:
case LengthModifier::AsInt64:
case LengthModifier::AsWide:
+ case LengthModifier::AsWideFast:
return ArgType::Invalid();
case LengthModifier::AsShortLong:
llvm_unreachable("only used for OpenCL which doesn not handle nArg");
diff --git a/clang/test/Sema/format-strings-ms.c b/clang/test/Sema/format-strings-ms.c
index 697032673d4e770..59ae930bb734eb6 100644
--- a/clang/test/Sema/format-strings-ms.c
+++ b/clang/test/Sema/format-strings-ms.c
@@ -1,6 +1,7 @@
// RUN: %clang_cc1 -fsyntax-only -verify -fms-compatibility -triple=i386-pc-win32 %s
// RUN: %clang_cc1 -fsyntax-only -verify -fms-compatibility -triple=i386-pc-win32 -Wformat-non-iso -DNON_ISO_WARNING %s
+#include <stdint.h>
int printf(const char *format, ...) __attribute__((format(printf, 1, 2)));
int scanf(const char * restrict, ...) ;
typedef unsigned short wchar_t;
@@ -85,4 +86,31 @@ void z_test(void *p) {
scanf("%Z", p); // expected-warning{{invalid conversion specifier 'Z'}}
}
+void w_int_test(void) {
+ int8_t a = 0b101;
+ int16_t b = 2;
+ uint32_t c = 123;
+ int64_t d = 0x3b;
+
+ // for %w
+ printf("%w8b", a); // expected-warning{{format specifies type 'char' but the argument has type 'int8_t' (aka 'signed char')}}
+ printf("%w16i", b);
+ printf("%w32u", c);
+ printf("%w64x", d);
+
+}
+
+void wf_test(void) {
+ int_fast8_t a = 0b101;
+ uint_fast16_t b = 2;
+ int_fast32_t c = 021;
+ int_fast64_t d = 0x3a;
+
+ // for %wf
+ printf("%wf8b", a); // expected-warning{{format specifies type 'char' but the argument has type 'int_fast8_t' (aka 'signed char')}}
+ printf("%wf16u", b);
+ printf("%wf32o", c);
+ printf("%wf64X", d);
+}
+
#endif
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