679 lines
20 KiB
C++
679 lines
20 KiB
C++
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// FormatString.cpp - Common stuff for handling printf/scanf formats -*- C++ -*-
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Shared details for processing format strings of printf and scanf
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// (and friends).
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//
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//===----------------------------------------------------------------------===//
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#include "FormatStringParsing.h"
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#include "clang/Basic/LangOptions.h"
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using clang::analyze_format_string::ArgTypeResult;
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using clang::analyze_format_string::FormatStringHandler;
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using clang::analyze_format_string::FormatSpecifier;
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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::PositionContext;
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using clang::analyze_format_string::ConversionSpecifier;
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using namespace clang;
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// Key function to FormatStringHandler.
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FormatStringHandler::~FormatStringHandler() {}
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//===----------------------------------------------------------------------===//
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// Functions for parsing format strings components in both printf and
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// scanf format strings.
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//===----------------------------------------------------------------------===//
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OptionalAmount
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clang::analyze_format_string::ParseAmount(const char *&Beg, const char *E) {
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const char *I = Beg;
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UpdateOnReturn <const char*> UpdateBeg(Beg, I);
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unsigned accumulator = 0;
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bool hasDigits = false;
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for ( ; I != E; ++I) {
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char c = *I;
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if (c >= '0' && c <= '9') {
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hasDigits = true;
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accumulator = (accumulator * 10) + (c - '0');
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continue;
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}
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if (hasDigits)
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return OptionalAmount(OptionalAmount::Constant, accumulator, Beg, I - Beg,
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false);
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break;
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}
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return OptionalAmount();
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}
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OptionalAmount
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clang::analyze_format_string::ParseNonPositionAmount(const char *&Beg,
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const char *E,
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unsigned &argIndex) {
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if (*Beg == '*') {
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++Beg;
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return OptionalAmount(OptionalAmount::Arg, argIndex++, Beg, 0, false);
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}
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return ParseAmount(Beg, E);
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}
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OptionalAmount
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clang::analyze_format_string::ParsePositionAmount(FormatStringHandler &H,
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const char *Start,
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const char *&Beg,
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const char *E,
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PositionContext p) {
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if (*Beg == '*') {
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const char *I = Beg + 1;
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const OptionalAmount &Amt = ParseAmount(I, E);
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if (Amt.getHowSpecified() == OptionalAmount::NotSpecified) {
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H.HandleInvalidPosition(Beg, I - Beg, p);
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return OptionalAmount(false);
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}
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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 OptionalAmount(false);
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}
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assert(Amt.getHowSpecified() == OptionalAmount::Constant);
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if (*I == '$') {
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// Handle positional arguments
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// Special case: '*0$', since this is an easy mistake.
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if (Amt.getConstantAmount() == 0) {
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H.HandleZeroPosition(Beg, I - Beg + 1);
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return OptionalAmount(false);
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}
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const char *Tmp = Beg;
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Beg = ++I;
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return OptionalAmount(OptionalAmount::Arg, Amt.getConstantAmount() - 1,
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Tmp, 0, true);
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}
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H.HandleInvalidPosition(Beg, I - Beg, p);
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return OptionalAmount(false);
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}
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return ParseAmount(Beg, E);
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}
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bool
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clang::analyze_format_string::ParseFieldWidth(FormatStringHandler &H,
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FormatSpecifier &CS,
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const char *Start,
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const char *&Beg, const char *E,
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unsigned *argIndex) {
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// FIXME: Support negative field widths.
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if (argIndex) {
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CS.setFieldWidth(ParseNonPositionAmount(Beg, E, *argIndex));
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}
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else {
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const OptionalAmount Amt =
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ParsePositionAmount(H, Start, Beg, E,
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analyze_format_string::FieldWidthPos);
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if (Amt.isInvalid())
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return true;
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CS.setFieldWidth(Amt);
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}
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return false;
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}
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bool
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clang::analyze_format_string::ParseArgPosition(FormatStringHandler &H,
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FormatSpecifier &FS,
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const char *Start,
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const char *&Beg,
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const char *E) {
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const char *I = Beg;
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const OptionalAmount &Amt = ParseAmount(I, E);
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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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if (Amt.getHowSpecified() == OptionalAmount::Constant && *(I++) == '$') {
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// Warn that positional arguments are non-standard.
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H.HandlePosition(Start, I - Start);
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// Special case: '%0$', since this is an easy mistake.
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if (Amt.getConstantAmount() == 0) {
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H.HandleZeroPosition(Start, I - Start);
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return true;
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}
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FS.setArgIndex(Amt.getConstantAmount() - 1);
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FS.setUsesPositionalArg();
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// Update the caller's pointer if we decided to consume
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// these characters.
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Beg = I;
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return false;
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}
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return false;
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}
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bool
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clang::analyze_format_string::ParseLengthModifier(FormatSpecifier &FS,
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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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bool IsScanf) {
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LengthModifier::Kind lmKind = LengthModifier::None;
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const char *lmPosition = I;
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switch (*I) {
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default:
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return false;
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case 'h':
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++I;
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lmKind = (I != E && *I == 'h') ? (++I, LengthModifier::AsChar)
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: LengthModifier::AsShort;
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break;
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case 'l':
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++I;
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lmKind = (I != E && *I == 'l') ? (++I, LengthModifier::AsLongLong)
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: LengthModifier::AsLong;
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break;
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case 'j': lmKind = LengthModifier::AsIntMax; ++I; break;
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case 'z': lmKind = LengthModifier::AsSizeT; ++I; break;
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case 't': lmKind = LengthModifier::AsPtrDiff; ++I; break;
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case 'L': lmKind = LengthModifier::AsLongDouble; ++I; break;
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case 'q': lmKind = LengthModifier::AsQuad; ++I; break;
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case 'a':
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if (IsScanf && !LO.C99 && !LO.CPlusPlus0x) {
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// For scanf in C90, look at the next character to see if this should
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// be parsed as the GNU extension 'a' length modifier. If not, this
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// will be parsed as a conversion specifier.
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++I;
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if (I != E && (*I == 's' || *I == 'S' || *I == '[')) {
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lmKind = LengthModifier::AsAllocate;
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break;
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}
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--I;
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}
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return false;
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case 'm':
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if (IsScanf) {
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lmKind = LengthModifier::AsMAllocate;
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++I;
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break;
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}
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return false;
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}
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LengthModifier lm(lmPosition, lmKind);
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FS.setLengthModifier(lm);
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return true;
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}
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//===----------------------------------------------------------------------===//
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// Methods on ArgTypeResult.
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//===----------------------------------------------------------------------===//
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bool ArgTypeResult::matchesType(ASTContext &C, QualType argTy) const {
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switch (K) {
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case InvalidTy:
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llvm_unreachable("ArgTypeResult must be valid");
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case UnknownTy:
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return true;
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case AnyCharTy: {
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if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
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switch (BT->getKind()) {
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default:
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break;
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case BuiltinType::Char_S:
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case BuiltinType::SChar:
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case BuiltinType::UChar:
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case BuiltinType::Char_U:
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return true;
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}
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return false;
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}
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case SpecificTy: {
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argTy = C.getCanonicalType(argTy).getUnqualifiedType();
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if (T == argTy)
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return true;
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// Check for "compatible types".
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if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
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switch (BT->getKind()) {
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default:
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break;
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case BuiltinType::Char_S:
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case BuiltinType::SChar:
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return T == C.UnsignedCharTy;
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case BuiltinType::Char_U:
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case BuiltinType::UChar:
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return T == C.SignedCharTy;
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case BuiltinType::Short:
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return T == C.UnsignedShortTy;
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case BuiltinType::UShort:
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return T == C.ShortTy;
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case BuiltinType::Int:
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return T == C.UnsignedIntTy;
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case BuiltinType::UInt:
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return T == C.IntTy;
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case BuiltinType::Long:
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return T == C.UnsignedLongTy;
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case BuiltinType::ULong:
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return T == C.LongTy;
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case BuiltinType::LongLong:
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return T == C.UnsignedLongLongTy;
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case BuiltinType::ULongLong:
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return T == C.LongLongTy;
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}
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return false;
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}
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case CStrTy: {
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const PointerType *PT = argTy->getAs<PointerType>();
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if (!PT)
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return false;
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QualType pointeeTy = PT->getPointeeType();
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if (const BuiltinType *BT = pointeeTy->getAs<BuiltinType>())
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switch (BT->getKind()) {
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case BuiltinType::Void:
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case BuiltinType::Char_U:
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case BuiltinType::UChar:
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case BuiltinType::Char_S:
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case BuiltinType::SChar:
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return true;
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default:
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break;
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}
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return false;
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}
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case WCStrTy: {
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const PointerType *PT = argTy->getAs<PointerType>();
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if (!PT)
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return false;
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QualType pointeeTy =
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C.getCanonicalType(PT->getPointeeType()).getUnqualifiedType();
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return pointeeTy == C.getWCharType();
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}
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case WIntTy: {
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// Instead of doing a lookup for the definition of 'wint_t' (which
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// is defined by the system headers) instead see if wchar_t and
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// the argument type promote to the same type.
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QualType PromoWChar =
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C.getWCharType()->isPromotableIntegerType()
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? C.getPromotedIntegerType(C.getWCharType()) : C.getWCharType();
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QualType PromoArg =
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argTy->isPromotableIntegerType()
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? C.getPromotedIntegerType(argTy) : argTy;
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PromoWChar = C.getCanonicalType(PromoWChar).getUnqualifiedType();
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PromoArg = C.getCanonicalType(PromoArg).getUnqualifiedType();
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return PromoWChar == PromoArg;
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}
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case CPointerTy:
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return argTy->isPointerType() || argTy->isObjCObjectPointerType() ||
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argTy->isBlockPointerType() || argTy->isNullPtrType();
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case ObjCPointerTy: {
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if (argTy->getAs<ObjCObjectPointerType>() ||
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argTy->getAs<BlockPointerType>())
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return true;
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// Handle implicit toll-free bridging.
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if (const PointerType *PT = argTy->getAs<PointerType>()) {
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// Things such as CFTypeRef are really just opaque pointers
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// to C structs representing CF types that can often be bridged
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// to Objective-C objects. Since the compiler doesn't know which
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// structs can be toll-free bridged, we just accept them all.
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QualType pointee = PT->getPointeeType();
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if (pointee->getAsStructureType() || pointee->isVoidType())
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return true;
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}
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return false;
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}
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}
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llvm_unreachable("Invalid ArgTypeResult Kind!");
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}
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QualType ArgTypeResult::getRepresentativeType(ASTContext &C) const {
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switch (K) {
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case InvalidTy:
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llvm_unreachable("No representative type for Invalid ArgTypeResult");
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case UnknownTy:
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return QualType();
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case AnyCharTy:
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return C.CharTy;
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case SpecificTy:
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return T;
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case CStrTy:
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return C.getPointerType(C.CharTy);
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case WCStrTy:
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return C.getPointerType(C.getWCharType());
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case ObjCPointerTy:
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return C.ObjCBuiltinIdTy;
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case CPointerTy:
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return C.VoidPtrTy;
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case WIntTy: {
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QualType WC = C.getWCharType();
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return WC->isPromotableIntegerType() ? C.getPromotedIntegerType(WC) : WC;
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}
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}
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llvm_unreachable("Invalid ArgTypeResult Kind!");
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}
|
||
|
|
|
||
|
|
std::string ArgTypeResult::getRepresentativeTypeName(ASTContext &C) const {
|
||
|
|
std::string S = getRepresentativeType(C).getAsString();
|
||
|
|
if (Name && S != Name)
|
||
|
|
return std::string("'") + Name + "' (aka '" + S + "')";
|
||
|
|
return std::string("'") + S + "'";
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
// Methods on OptionalAmount.
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
ArgTypeResult
|
||
|
|
analyze_format_string::OptionalAmount::getArgType(ASTContext &Ctx) const {
|
||
|
|
return Ctx.IntTy;
|
||
|
|
}
|
||
|
|
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
// Methods on LengthModifier.
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
const char *
|
||
|
|
analyze_format_string::LengthModifier::toString() const {
|
||
|
|
switch (kind) {
|
||
|
|
case AsChar:
|
||
|
|
return "hh";
|
||
|
|
case AsShort:
|
||
|
|
return "h";
|
||
|
|
case AsLong: // or AsWideChar
|
||
|
|
return "l";
|
||
|
|
case AsLongLong:
|
||
|
|
return "ll";
|
||
|
|
case AsQuad:
|
||
|
|
return "q";
|
||
|
|
case AsIntMax:
|
||
|
|
return "j";
|
||
|
|
case AsSizeT:
|
||
|
|
return "z";
|
||
|
|
case AsPtrDiff:
|
||
|
|
return "t";
|
||
|
|
case AsLongDouble:
|
||
|
|
return "L";
|
||
|
|
case AsAllocate:
|
||
|
|
return "a";
|
||
|
|
case AsMAllocate:
|
||
|
|
return "m";
|
||
|
|
case None:
|
||
|
|
return "";
|
||
|
|
}
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
// Methods on ConversionSpecifier.
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
const char *ConversionSpecifier::toString() const {
|
||
|
|
switch (kind) {
|
||
|
|
case dArg: return "d";
|
||
|
|
case iArg: return "i";
|
||
|
|
case oArg: return "o";
|
||
|
|
case uArg: return "u";
|
||
|
|
case xArg: return "x";
|
||
|
|
case XArg: return "X";
|
||
|
|
case fArg: return "f";
|
||
|
|
case FArg: return "F";
|
||
|
|
case eArg: return "e";
|
||
|
|
case EArg: return "E";
|
||
|
|
case gArg: return "g";
|
||
|
|
case GArg: return "G";
|
||
|
|
case aArg: return "a";
|
||
|
|
case AArg: return "A";
|
||
|
|
case cArg: return "c";
|
||
|
|
case sArg: return "s";
|
||
|
|
case pArg: return "p";
|
||
|
|
case nArg: return "n";
|
||
|
|
case PercentArg: return "%";
|
||
|
|
case ScanListArg: return "[";
|
||
|
|
case InvalidSpecifier: return NULL;
|
||
|
|
|
||
|
|
// MacOS X unicode extensions.
|
||
|
|
case CArg: return "C";
|
||
|
|
case SArg: return "S";
|
||
|
|
|
||
|
|
// Objective-C specific specifiers.
|
||
|
|
case ObjCObjArg: return "@";
|
||
|
|
|
||
|
|
// GlibC specific specifiers.
|
||
|
|
case PrintErrno: return "m";
|
||
|
|
}
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
// Methods on OptionalAmount.
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
void OptionalAmount::toString(raw_ostream &os) const {
|
||
|
|
switch (hs) {
|
||
|
|
case Invalid:
|
||
|
|
case NotSpecified:
|
||
|
|
return;
|
||
|
|
case Arg:
|
||
|
|
if (UsesDotPrefix)
|
||
|
|
os << ".";
|
||
|
|
if (usesPositionalArg())
|
||
|
|
os << "*" << getPositionalArgIndex() << "$";
|
||
|
|
else
|
||
|
|
os << "*";
|
||
|
|
break;
|
||
|
|
case Constant:
|
||
|
|
if (UsesDotPrefix)
|
||
|
|
os << ".";
|
||
|
|
os << amt;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bool FormatSpecifier::hasValidLengthModifier() const {
|
||
|
|
switch (LM.getKind()) {
|
||
|
|
case LengthModifier::None:
|
||
|
|
return true;
|
||
|
|
|
||
|
|
// Handle most integer flags
|
||
|
|
case LengthModifier::AsChar:
|
||
|
|
case LengthModifier::AsShort:
|
||
|
|
case LengthModifier::AsLongLong:
|
||
|
|
case LengthModifier::AsQuad:
|
||
|
|
case LengthModifier::AsIntMax:
|
||
|
|
case LengthModifier::AsSizeT:
|
||
|
|
case LengthModifier::AsPtrDiff:
|
||
|
|
switch (CS.getKind()) {
|
||
|
|
case ConversionSpecifier::dArg:
|
||
|
|
case ConversionSpecifier::iArg:
|
||
|
|
case ConversionSpecifier::oArg:
|
||
|
|
case ConversionSpecifier::uArg:
|
||
|
|
case ConversionSpecifier::xArg:
|
||
|
|
case ConversionSpecifier::XArg:
|
||
|
|
case ConversionSpecifier::nArg:
|
||
|
|
return true;
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Handle 'l' flag
|
||
|
|
case LengthModifier::AsLong:
|
||
|
|
switch (CS.getKind()) {
|
||
|
|
case ConversionSpecifier::dArg:
|
||
|
|
case ConversionSpecifier::iArg:
|
||
|
|
case ConversionSpecifier::oArg:
|
||
|
|
case ConversionSpecifier::uArg:
|
||
|
|
case ConversionSpecifier::xArg:
|
||
|
|
case ConversionSpecifier::XArg:
|
||
|
|
case ConversionSpecifier::aArg:
|
||
|
|
case ConversionSpecifier::AArg:
|
||
|
|
case ConversionSpecifier::fArg:
|
||
|
|
case ConversionSpecifier::FArg:
|
||
|
|
case ConversionSpecifier::eArg:
|
||
|
|
case ConversionSpecifier::EArg:
|
||
|
|
case ConversionSpecifier::gArg:
|
||
|
|
case ConversionSpecifier::GArg:
|
||
|
|
case ConversionSpecifier::nArg:
|
||
|
|
case ConversionSpecifier::cArg:
|
||
|
|
case ConversionSpecifier::sArg:
|
||
|
|
case ConversionSpecifier::ScanListArg:
|
||
|
|
return true;
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
case LengthModifier::AsLongDouble:
|
||
|
|
switch (CS.getKind()) {
|
||
|
|
case ConversionSpecifier::aArg:
|
||
|
|
case ConversionSpecifier::AArg:
|
||
|
|
case ConversionSpecifier::fArg:
|
||
|
|
case ConversionSpecifier::FArg:
|
||
|
|
case ConversionSpecifier::eArg:
|
||
|
|
case ConversionSpecifier::EArg:
|
||
|
|
case ConversionSpecifier::gArg:
|
||
|
|
case ConversionSpecifier::GArg:
|
||
|
|
return true;
|
||
|
|
// GNU extension.
|
||
|
|
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::AsAllocate:
|
||
|
|
switch (CS.getKind()) {
|
||
|
|
case ConversionSpecifier::sArg:
|
||
|
|
case ConversionSpecifier::SArg:
|
||
|
|
case ConversionSpecifier::ScanListArg:
|
||
|
|
return true;
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
case LengthModifier::AsMAllocate:
|
||
|
|
switch (CS.getKind()) {
|
||
|
|
case ConversionSpecifier::cArg:
|
||
|
|
case ConversionSpecifier::CArg:
|
||
|
|
case ConversionSpecifier::sArg:
|
||
|
|
case ConversionSpecifier::SArg:
|
||
|
|
case ConversionSpecifier::ScanListArg:
|
||
|
|
return true;
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
llvm_unreachable("Invalid LengthModifier Kind!");
|
||
|
|
}
|
||
|
|
|
||
|
|
bool FormatSpecifier::hasStandardLengthModifier() const {
|
||
|
|
switch (LM.getKind()) {
|
||
|
|
case LengthModifier::None:
|
||
|
|
case LengthModifier::AsChar:
|
||
|
|
case LengthModifier::AsShort:
|
||
|
|
case LengthModifier::AsLong:
|
||
|
|
case LengthModifier::AsLongLong:
|
||
|
|
case LengthModifier::AsIntMax:
|
||
|
|
case LengthModifier::AsSizeT:
|
||
|
|
case LengthModifier::AsPtrDiff:
|
||
|
|
case LengthModifier::AsLongDouble:
|
||
|
|
return true;
|
||
|
|
case LengthModifier::AsAllocate:
|
||
|
|
case LengthModifier::AsMAllocate:
|
||
|
|
case LengthModifier::AsQuad:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
llvm_unreachable("Invalid LengthModifier Kind!");
|
||
|
|
}
|
||
|
|
|
||
|
|
bool FormatSpecifier::hasStandardConversionSpecifier(const LangOptions &LangOpt) const {
|
||
|
|
switch (CS.getKind()) {
|
||
|
|
case ConversionSpecifier::cArg:
|
||
|
|
case ConversionSpecifier::dArg:
|
||
|
|
case ConversionSpecifier::iArg:
|
||
|
|
case ConversionSpecifier::oArg:
|
||
|
|
case ConversionSpecifier::uArg:
|
||
|
|
case ConversionSpecifier::xArg:
|
||
|
|
case ConversionSpecifier::XArg:
|
||
|
|
case ConversionSpecifier::fArg:
|
||
|
|
case ConversionSpecifier::FArg:
|
||
|
|
case ConversionSpecifier::eArg:
|
||
|
|
case ConversionSpecifier::EArg:
|
||
|
|
case ConversionSpecifier::gArg:
|
||
|
|
case ConversionSpecifier::GArg:
|
||
|
|
case ConversionSpecifier::aArg:
|
||
|
|
case ConversionSpecifier::AArg:
|
||
|
|
case ConversionSpecifier::sArg:
|
||
|
|
case ConversionSpecifier::pArg:
|
||
|
|
case ConversionSpecifier::nArg:
|
||
|
|
case ConversionSpecifier::ObjCObjArg:
|
||
|
|
case ConversionSpecifier::ScanListArg:
|
||
|
|
case ConversionSpecifier::PercentArg:
|
||
|
|
return true;
|
||
|
|
case ConversionSpecifier::CArg:
|
||
|
|
case ConversionSpecifier::SArg:
|
||
|
|
return LangOpt.ObjC1 || LangOpt.ObjC2;
|
||
|
|
case ConversionSpecifier::InvalidSpecifier:
|
||
|
|
case ConversionSpecifier::PrintErrno:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
llvm_unreachable("Invalid ConversionSpecifier Kind!");
|
||
|
|
}
|
||
|
|
|
||
|
|
bool FormatSpecifier::hasStandardLengthConversionCombination() const {
|
||
|
|
if (LM.getKind() == LengthModifier::AsLongDouble) {
|
||
|
|
switch(CS.getKind()) {
|
||
|
|
case ConversionSpecifier::dArg:
|
||
|
|
case ConversionSpecifier::iArg:
|
||
|
|
case ConversionSpecifier::oArg:
|
||
|
|
case ConversionSpecifier::uArg:
|
||
|
|
case ConversionSpecifier::xArg:
|
||
|
|
case ConversionSpecifier::XArg:
|
||
|
|
return false;
|
||
|
|
default:
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|