568 lines
19 KiB
C++
568 lines
19 KiB
C++
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//= ScanfFormatString.cpp - Analysis of printf format strings --*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Handling of format string in scanf and friends. The structure of format
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// strings for fscanf() are described in C99 7.19.6.2.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/FormatString.h"
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#include "FormatStringParsing.h"
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#include "clang/Basic/TargetInfo.h"
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using clang::analyze_format_string::ArgType;
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using clang::analyze_format_string::FormatStringHandler;
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using clang::analyze_format_string::LengthModifier;
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using clang::analyze_format_string::OptionalAmount;
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using clang::analyze_format_string::ConversionSpecifier;
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using clang::analyze_scanf::ScanfConversionSpecifier;
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using clang::analyze_scanf::ScanfSpecifier;
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using clang::UpdateOnReturn;
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using namespace clang;
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typedef clang::analyze_format_string::SpecifierResult<ScanfSpecifier>
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ScanfSpecifierResult;
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static bool ParseScanList(FormatStringHandler &H,
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ScanfConversionSpecifier &CS,
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const char *&Beg, const char *E) {
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const char *I = Beg;
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const char *start = I - 1;
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UpdateOnReturn <const char*> UpdateBeg(Beg, I);
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// No more characters?
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if (I == E) {
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H.HandleIncompleteScanList(start, I);
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return true;
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}
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// Special case: ']' is the first character.
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if (*I == ']') {
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if (++I == E) {
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H.HandleIncompleteScanList(start, I - 1);
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return true;
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}
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}
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// Special case: "^]" are the first characters.
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if (I + 1 != E && I[0] == '^' && I[1] == ']') {
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I += 2;
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if (I == E) {
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H.HandleIncompleteScanList(start, I - 1);
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return true;
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}
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}
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// Look for a ']' character which denotes the end of the scan list.
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while (*I != ']') {
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if (++I == E) {
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H.HandleIncompleteScanList(start, I - 1);
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return true;
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}
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}
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CS.setEndScanList(I);
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return false;
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}
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// FIXME: Much of this is copy-paste from ParsePrintfSpecifier.
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// We can possibly refactor.
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static ScanfSpecifierResult ParseScanfSpecifier(FormatStringHandler &H,
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const char *&Beg,
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const char *E,
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unsigned &argIndex,
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const LangOptions &LO,
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const TargetInfo &Target) {
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using namespace clang::analyze_format_string;
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using namespace clang::analyze_scanf;
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const char *I = Beg;
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const char *Start = nullptr;
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UpdateOnReturn <const char*> UpdateBeg(Beg, I);
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// Look for a '%' character that indicates the start of a format specifier.
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for ( ; I != E ; ++I) {
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char c = *I;
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if (c == '\0') {
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// Detect spurious null characters, which are likely errors.
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H.HandleNullChar(I);
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return true;
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}
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if (c == '%') {
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Start = I++; // Record the start of the format specifier.
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break;
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}
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}
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// No format specifier found?
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if (!Start)
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return false;
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if (I == E) {
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// No more characters left?
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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ScanfSpecifier FS;
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if (ParseArgPosition(H, FS, Start, I, E))
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return true;
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if (I == E) {
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// No more characters left?
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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// Look for '*' flag if it is present.
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if (*I == '*') {
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FS.setSuppressAssignment(I);
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if (++I == E) {
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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}
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// Look for the field width (if any). Unlike printf, this is either
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// a fixed integer or isn't present.
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const OptionalAmount &Amt = clang::analyze_format_string::ParseAmount(I, E);
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if (Amt.getHowSpecified() != OptionalAmount::NotSpecified) {
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assert(Amt.getHowSpecified() == OptionalAmount::Constant);
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FS.setFieldWidth(Amt);
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if (I == E) {
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// No more characters left?
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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}
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// Look for the length modifier.
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if (ParseLengthModifier(FS, I, E, LO, /*IsScanf=*/true) && I == E) {
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// No more characters left?
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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// Detect spurious null characters, which are likely errors.
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if (*I == '\0') {
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H.HandleNullChar(I);
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return true;
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}
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// Finally, look for the conversion specifier.
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const char *conversionPosition = I++;
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ScanfConversionSpecifier::Kind k = ScanfConversionSpecifier::InvalidSpecifier;
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switch (*conversionPosition) {
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default:
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break;
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case '%': k = ConversionSpecifier::PercentArg; break;
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case 'A': k = ConversionSpecifier::AArg; break;
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case 'E': k = ConversionSpecifier::EArg; break;
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case 'F': k = ConversionSpecifier::FArg; break;
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case 'G': k = ConversionSpecifier::GArg; break;
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case 'X': k = ConversionSpecifier::XArg; break;
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case 'a': k = ConversionSpecifier::aArg; break;
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case 'd': k = ConversionSpecifier::dArg; break;
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case 'e': k = ConversionSpecifier::eArg; break;
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case 'f': k = ConversionSpecifier::fArg; break;
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case 'g': k = ConversionSpecifier::gArg; break;
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case 'i': k = ConversionSpecifier::iArg; break;
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case 'n': k = ConversionSpecifier::nArg; break;
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case 'c': k = ConversionSpecifier::cArg; break;
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case 'C': k = ConversionSpecifier::CArg; break;
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case 'S': k = ConversionSpecifier::SArg; break;
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case '[': k = ConversionSpecifier::ScanListArg; break;
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case 'u': k = ConversionSpecifier::uArg; break;
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case 'x': k = ConversionSpecifier::xArg; break;
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case 'o': k = ConversionSpecifier::oArg; break;
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case 's': k = ConversionSpecifier::sArg; break;
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case 'p': k = ConversionSpecifier::pArg; break;
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// Apple extensions
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// Apple-specific
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case 'D':
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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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if (Target.getTriple().isOSDarwin())
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k = ConversionSpecifier::OArg;
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break;
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case 'U':
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if (Target.getTriple().isOSDarwin())
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k = ConversionSpecifier::UArg;
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break;
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}
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ScanfConversionSpecifier CS(conversionPosition, k);
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if (k == ScanfConversionSpecifier::ScanListArg) {
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if (ParseScanList(H, CS, I, E))
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return true;
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}
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FS.setConversionSpecifier(CS);
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if (CS.consumesDataArgument() && !FS.getSuppressAssignment()
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&& !FS.usesPositionalArg())
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FS.setArgIndex(argIndex++);
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// FIXME: '%' and '*' doesn't make sense. Issue a warning.
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// FIXME: 'ConsumedSoFar' and '*' doesn't make sense.
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if (k == ScanfConversionSpecifier::InvalidSpecifier) {
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unsigned Len = I - Beg;
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if (ParseUTF8InvalidSpecifier(Beg, E, Len)) {
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CS.setEndScanList(Beg + Len);
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FS.setConversionSpecifier(CS);
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}
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// Assume the conversion takes one argument.
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return !H.HandleInvalidScanfConversionSpecifier(FS, Beg, Len);
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}
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return ScanfSpecifierResult(Start, FS);
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}
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ArgType ScanfSpecifier::getArgType(ASTContext &Ctx) const {
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const ScanfConversionSpecifier &CS = getConversionSpecifier();
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if (!CS.consumesDataArgument())
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return ArgType::Invalid();
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switch(CS.getKind()) {
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// Signed int.
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case ConversionSpecifier::dArg:
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case ConversionSpecifier::DArg:
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case ConversionSpecifier::iArg:
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switch (LM.getKind()) {
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case LengthModifier::None:
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return ArgType::PtrTo(Ctx.IntTy);
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case LengthModifier::AsChar:
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return ArgType::PtrTo(ArgType::AnyCharTy);
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case LengthModifier::AsShort:
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return ArgType::PtrTo(Ctx.ShortTy);
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case LengthModifier::AsLong:
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return ArgType::PtrTo(Ctx.LongTy);
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case LengthModifier::AsLongLong:
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case LengthModifier::AsQuad:
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return ArgType::PtrTo(Ctx.LongLongTy);
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case LengthModifier::AsInt64:
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return ArgType::PtrTo(ArgType(Ctx.LongLongTy, "__int64"));
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case LengthModifier::AsIntMax:
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return ArgType::PtrTo(ArgType(Ctx.getIntMaxType(), "intmax_t"));
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case LengthModifier::AsSizeT:
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return ArgType::PtrTo(ArgType(Ctx.getSignedSizeType(), "ssize_t"));
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case LengthModifier::AsPtrDiff:
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return ArgType::PtrTo(ArgType(Ctx.getPointerDiffType(), "ptrdiff_t"));
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case LengthModifier::AsLongDouble:
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// GNU extension.
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return ArgType::PtrTo(Ctx.LongLongTy);
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case LengthModifier::AsAllocate:
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case LengthModifier::AsMAllocate:
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case LengthModifier::AsInt32:
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case LengthModifier::AsInt3264:
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case LengthModifier::AsWide:
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case LengthModifier::AsShortLong:
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return ArgType::Invalid();
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}
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llvm_unreachable("Unsupported LengthModifier Type");
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// Unsigned int.
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case ConversionSpecifier::oArg:
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case ConversionSpecifier::OArg:
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case ConversionSpecifier::uArg:
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case ConversionSpecifier::UArg:
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case ConversionSpecifier::xArg:
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case ConversionSpecifier::XArg:
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switch (LM.getKind()) {
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case LengthModifier::None:
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return ArgType::PtrTo(Ctx.UnsignedIntTy);
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case LengthModifier::AsChar:
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return ArgType::PtrTo(Ctx.UnsignedCharTy);
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case LengthModifier::AsShort:
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return ArgType::PtrTo(Ctx.UnsignedShortTy);
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case LengthModifier::AsLong:
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return ArgType::PtrTo(Ctx.UnsignedLongTy);
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case LengthModifier::AsLongLong:
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case LengthModifier::AsQuad:
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return ArgType::PtrTo(Ctx.UnsignedLongLongTy);
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case LengthModifier::AsInt64:
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return ArgType::PtrTo(ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64"));
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case LengthModifier::AsIntMax:
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return ArgType::PtrTo(ArgType(Ctx.getUIntMaxType(), "uintmax_t"));
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case LengthModifier::AsSizeT:
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return ArgType::PtrTo(ArgType(Ctx.getSizeType(), "size_t"));
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case LengthModifier::AsPtrDiff:
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return ArgType::PtrTo(
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ArgType(Ctx.getUnsignedPointerDiffType(), "unsigned ptrdiff_t"));
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case LengthModifier::AsLongDouble:
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// GNU extension.
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return ArgType::PtrTo(Ctx.UnsignedLongLongTy);
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case LengthModifier::AsAllocate:
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case LengthModifier::AsMAllocate:
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case LengthModifier::AsInt32:
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case LengthModifier::AsInt3264:
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case LengthModifier::AsWide:
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case LengthModifier::AsShortLong:
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return ArgType::Invalid();
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}
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llvm_unreachable("Unsupported LengthModifier Type");
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// Float.
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case ConversionSpecifier::aArg:
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case ConversionSpecifier::AArg:
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case ConversionSpecifier::eArg:
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case ConversionSpecifier::EArg:
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case ConversionSpecifier::fArg:
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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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switch (LM.getKind()) {
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case LengthModifier::None:
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return ArgType::PtrTo(Ctx.FloatTy);
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case LengthModifier::AsLong:
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return ArgType::PtrTo(Ctx.DoubleTy);
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case LengthModifier::AsLongDouble:
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return ArgType::PtrTo(Ctx.LongDoubleTy);
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default:
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return ArgType::Invalid();
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}
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// Char, string and scanlist.
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case ConversionSpecifier::cArg:
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case ConversionSpecifier::sArg:
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case ConversionSpecifier::ScanListArg:
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switch (LM.getKind()) {
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case LengthModifier::None:
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return ArgType::PtrTo(ArgType::AnyCharTy);
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case LengthModifier::AsLong:
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case LengthModifier::AsWide:
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return ArgType::PtrTo(ArgType(Ctx.getWideCharType(), "wchar_t"));
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case LengthModifier::AsAllocate:
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case LengthModifier::AsMAllocate:
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return ArgType::PtrTo(ArgType::CStrTy);
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case LengthModifier::AsShort:
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if (Ctx.getTargetInfo().getTriple().isOSMSVCRT())
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return ArgType::PtrTo(ArgType::AnyCharTy);
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LLVM_FALLTHROUGH;
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default:
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return ArgType::Invalid();
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}
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case ConversionSpecifier::CArg:
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case ConversionSpecifier::SArg:
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// FIXME: Mac OS X specific?
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switch (LM.getKind()) {
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case LengthModifier::None:
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case LengthModifier::AsWide:
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return ArgType::PtrTo(ArgType(Ctx.getWideCharType(), "wchar_t"));
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case LengthModifier::AsAllocate:
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|
|
case LengthModifier::AsMAllocate:
|
||
|
|
return ArgType::PtrTo(ArgType(ArgType::WCStrTy, "wchar_t *"));
|
||
|
|
case LengthModifier::AsShort:
|
||
|
|
if (Ctx.getTargetInfo().getTriple().isOSMSVCRT())
|
||
|
|
return ArgType::PtrTo(ArgType::AnyCharTy);
|
||
|
|
LLVM_FALLTHROUGH;
|
||
|
|
default:
|
||
|
|
return ArgType::Invalid();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Pointer.
|
||
|
|
case ConversionSpecifier::pArg:
|
||
|
|
return ArgType::PtrTo(ArgType::CPointerTy);
|
||
|
|
|
||
|
|
// Write-back.
|
||
|
|
case ConversionSpecifier::nArg:
|
||
|
|
switch (LM.getKind()) {
|
||
|
|
case LengthModifier::None:
|
||
|
|
return ArgType::PtrTo(Ctx.IntTy);
|
||
|
|
case LengthModifier::AsChar:
|
||
|
|
return ArgType::PtrTo(Ctx.SignedCharTy);
|
||
|
|
case LengthModifier::AsShort:
|
||
|
|
return ArgType::PtrTo(Ctx.ShortTy);
|
||
|
|
case LengthModifier::AsLong:
|
||
|
|
return ArgType::PtrTo(Ctx.LongTy);
|
||
|
|
case LengthModifier::AsLongLong:
|
||
|
|
case LengthModifier::AsQuad:
|
||
|
|
return ArgType::PtrTo(Ctx.LongLongTy);
|
||
|
|
case LengthModifier::AsInt64:
|
||
|
|
return ArgType::PtrTo(ArgType(Ctx.LongLongTy, "__int64"));
|
||
|
|
case LengthModifier::AsIntMax:
|
||
|
|
return ArgType::PtrTo(ArgType(Ctx.getIntMaxType(), "intmax_t"));
|
||
|
|
case LengthModifier::AsSizeT:
|
||
|
|
return ArgType::PtrTo(ArgType(Ctx.getSignedSizeType(), "ssize_t"));
|
||
|
|
case LengthModifier::AsPtrDiff:
|
||
|
|
return ArgType::PtrTo(ArgType(Ctx.getPointerDiffType(), "ptrdiff_t"));
|
||
|
|
case LengthModifier::AsLongDouble:
|
||
|
|
return ArgType(); // FIXME: Is this a known extension?
|
||
|
|
case LengthModifier::AsAllocate:
|
||
|
|
case LengthModifier::AsMAllocate:
|
||
|
|
case LengthModifier::AsInt32:
|
||
|
|
case LengthModifier::AsInt3264:
|
||
|
|
case LengthModifier::AsWide:
|
||
|
|
case LengthModifier::AsShortLong:
|
||
|
|
return ArgType::Invalid();
|
||
|
|
}
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ArgType();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ScanfSpecifier::fixType(QualType QT, QualType RawQT,
|
||
|
|
const LangOptions &LangOpt,
|
||
|
|
ASTContext &Ctx) {
|
||
|
|
|
||
|
|
// %n is different from other conversion specifiers; don't try to fix it.
|
||
|
|
if (CS.getKind() == ConversionSpecifier::nArg)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
if (!QT->isPointerType())
|
||
|
|
return false;
|
||
|
|
|
||
|
|
QualType PT = QT->getPointeeType();
|
||
|
|
|
||
|
|
// If it's an enum, get its underlying type.
|
||
|
|
if (const EnumType *ETy = PT->getAs<EnumType>()) {
|
||
|
|
// Don't try to fix incomplete enums.
|
||
|
|
if (!ETy->getDecl()->isComplete())
|
||
|
|
return false;
|
||
|
|
PT = ETy->getDecl()->getIntegerType();
|
||
|
|
}
|
||
|
|
|
||
|
|
const BuiltinType *BT = PT->getAs<BuiltinType>();
|
||
|
|
if (!BT)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
// Pointer to a character.
|
||
|
|
if (PT->isAnyCharacterType()) {
|
||
|
|
CS.setKind(ConversionSpecifier::sArg);
|
||
|
|
if (PT->isWideCharType())
|
||
|
|
LM.setKind(LengthModifier::AsWideChar);
|
||
|
|
else
|
||
|
|
LM.setKind(LengthModifier::None);
|
||
|
|
|
||
|
|
// If we know the target array length, we can use it as a field width.
|
||
|
|
if (const ConstantArrayType *CAT = Ctx.getAsConstantArrayType(RawQT)) {
|
||
|
|
if (CAT->getSizeModifier() == ArrayType::Normal)
|
||
|
|
FieldWidth = OptionalAmount(OptionalAmount::Constant,
|
||
|
|
CAT->getSize().getZExtValue() - 1,
|
||
|
|
"", 0, false);
|
||
|
|
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Figure out the length modifier.
|
||
|
|
switch (BT->getKind()) {
|
||
|
|
// no modifier
|
||
|
|
case BuiltinType::UInt:
|
||
|
|
case BuiltinType::Int:
|
||
|
|
case BuiltinType::Float:
|
||
|
|
LM.setKind(LengthModifier::None);
|
||
|
|
break;
|
||
|
|
|
||
|
|
// hh
|
||
|
|
case BuiltinType::Char_U:
|
||
|
|
case BuiltinType::UChar:
|
||
|
|
case BuiltinType::Char_S:
|
||
|
|
case BuiltinType::SChar:
|
||
|
|
LM.setKind(LengthModifier::AsChar);
|
||
|
|
break;
|
||
|
|
|
||
|
|
// h
|
||
|
|
case BuiltinType::Short:
|
||
|
|
case BuiltinType::UShort:
|
||
|
|
LM.setKind(LengthModifier::AsShort);
|
||
|
|
break;
|
||
|
|
|
||
|
|
// l
|
||
|
|
case BuiltinType::Long:
|
||
|
|
case BuiltinType::ULong:
|
||
|
|
case BuiltinType::Double:
|
||
|
|
LM.setKind(LengthModifier::AsLong);
|
||
|
|
break;
|
||
|
|
|
||
|
|
// ll
|
||
|
|
case BuiltinType::LongLong:
|
||
|
|
case BuiltinType::ULongLong:
|
||
|
|
LM.setKind(LengthModifier::AsLongLong);
|
||
|
|
break;
|
||
|
|
|
||
|
|
// L
|
||
|
|
case BuiltinType::LongDouble:
|
||
|
|
LM.setKind(LengthModifier::AsLongDouble);
|
||
|
|
break;
|
||
|
|
|
||
|
|
// Don't know.
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Handle size_t, ptrdiff_t, etc. that have dedicated length modifiers in C99.
|
||
|
|
if (isa<TypedefType>(PT) && (LangOpt.C99 || LangOpt.CPlusPlus11))
|
||
|
|
namedTypeToLengthModifier(PT, LM);
|
||
|
|
|
||
|
|
// If fixing the length modifier was enough, we are done.
|
||
|
|
if (hasValidLengthModifier(Ctx.getTargetInfo(), LangOpt)) {
|
||
|
|
const analyze_scanf::ArgType &AT = getArgType(Ctx);
|
||
|
|
if (AT.isValid() && AT.matchesType(Ctx, QT))
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Figure out the conversion specifier.
|
||
|
|
if (PT->isRealFloatingType())
|
||
|
|
CS.setKind(ConversionSpecifier::fArg);
|
||
|
|
else if (PT->isSignedIntegerType())
|
||
|
|
CS.setKind(ConversionSpecifier::dArg);
|
||
|
|
else if (PT->isUnsignedIntegerType())
|
||
|
|
CS.setKind(ConversionSpecifier::uArg);
|
||
|
|
else
|
||
|
|
llvm_unreachable("Unexpected type");
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ScanfSpecifier::toString(raw_ostream &os) const {
|
||
|
|
os << "%";
|
||
|
|
|
||
|
|
if (usesPositionalArg())
|
||
|
|
os << getPositionalArgIndex() << "$";
|
||
|
|
if (SuppressAssignment)
|
||
|
|
os << "*";
|
||
|
|
|
||
|
|
FieldWidth.toString(os);
|
||
|
|
os << LM.toString();
|
||
|
|
os << CS.toString();
|
||
|
|
}
|
||
|
|
|
||
|
|
bool clang::analyze_format_string::ParseScanfString(FormatStringHandler &H,
|
||
|
|
const char *I,
|
||
|
|
const char *E,
|
||
|
|
const LangOptions &LO,
|
||
|
|
const TargetInfo &Target) {
|
||
|
|
|
||
|
|
unsigned argIndex = 0;
|
||
|
|
|
||
|
|
// Keep looking for a format specifier until we have exhausted the string.
|
||
|
|
while (I != E) {
|
||
|
|
const ScanfSpecifierResult &FSR = ParseScanfSpecifier(H, I, E, argIndex,
|
||
|
|
LO, Target);
|
||
|
|
// Did a fail-stop error of any kind occur when parsing the specifier?
|
||
|
|
// If so, don't do any more processing.
|
||
|
|
if (FSR.shouldStop())
|
||
|
|
return true;
|
||
|
|
// Did we exhaust the string or encounter an error that
|
||
|
|
// we can recover from?
|
||
|
|
if (!FSR.hasValue())
|
||
|
|
continue;
|
||
|
|
// We have a format specifier. Pass it to the callback.
|
||
|
|
if (!H.HandleScanfSpecifier(FSR.getValue(), FSR.getStart(),
|
||
|
|
I - FSR.getStart())) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
assert(I == E && "Format string not exhausted");
|
||
|
|
return false;
|
||
|
|
}
|