441 lines
16 KiB
C++
441 lines
16 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2023 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#ifndef astutilsH
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#define astutilsH
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//---------------------------------------------------------------------------
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#include <functional>
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#include <stack>
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#include <string>
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#include <type_traits>
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#include <vector>
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#include "config.h"
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#include "errortypes.h"
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#include "library.h"
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#include "smallvector.h"
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#include "symboldatabase.h"
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#include "token.h"
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class Settings;
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enum class ChildrenToVisit {
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none,
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op1,
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op2,
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op1_and_op2,
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done // found what we looked for, don't visit any more children
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};
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/**
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* Visit AST nodes recursively. The order is not "well defined"
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*/
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template<class T, class TFunc, REQUIRES("T must be a Token class", std::is_convertible<T*, const Token*> )>
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void visitAstNodes(T *ast, const TFunc &visitor)
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{
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if (!ast)
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return;
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// the size of 8 was determined in tests to be sufficient to avoid excess allocations. also add 1 as a buffer.
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// we might need to increase that value in the future.
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std::stack<T *, SmallVector<T *, 8 + 1>> tokens;
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T *tok = ast;
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do {
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const ChildrenToVisit c = visitor(tok);
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if (c == ChildrenToVisit::done)
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break;
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if (c == ChildrenToVisit::op2 || c == ChildrenToVisit::op1_and_op2) {
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T *t2 = tok->astOperand2();
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if (t2)
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tokens.push(t2);
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}
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if (c == ChildrenToVisit::op1 || c == ChildrenToVisit::op1_and_op2) {
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T *t1 = tok->astOperand1();
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if (t1)
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tokens.push(t1);
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}
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if (tokens.empty())
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break;
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tok = tokens.top();
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tokens.pop();
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} while (true);
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}
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template<class TFunc>
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const Token* findAstNode(const Token* ast, const TFunc& pred)
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{
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const Token* result = nullptr;
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visitAstNodes(ast, [&](const Token* tok) {
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if (pred(tok)) {
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result = tok;
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return ChildrenToVisit::done;
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}
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return ChildrenToVisit::op1_and_op2;
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});
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return result;
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}
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template<class TFunc>
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const Token* findParent(const Token* tok, const TFunc& pred)
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{
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if (!tok)
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return nullptr;
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const Token* parent = tok->astParent();
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while (parent && !pred(parent)) {
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parent = parent->astParent();
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}
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return parent;
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}
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const Token* findExpression(const nonneg int exprid,
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const Token* start,
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const Token* end,
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const std::function<bool(const Token*)>& pred);
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const Token* findExpression(const Token* start, const nonneg int exprid);
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std::vector<const Token*> astFlatten(const Token* tok, const char* op);
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std::vector<Token*> astFlatten(Token* tok, const char* op);
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nonneg int astCount(const Token* tok, const char* op, int depth = 100);
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bool astHasToken(const Token* root, const Token * tok);
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bool astHasVar(const Token * tok, nonneg int varid);
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bool astIsPrimitive(const Token* tok);
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/** Is expression a 'signed char' if no promotion is used */
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bool astIsSignedChar(const Token *tok);
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/** Is expression a 'char' if no promotion is used? */
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bool astIsUnknownSignChar(const Token *tok);
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/** Is expression a char according to valueType? */
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bool astIsGenericChar(const Token* tok);
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/** Is expression of integral type? */
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bool astIsIntegral(const Token *tok, bool unknown);
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bool astIsUnsigned(const Token* tok);
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/** Is expression of floating point type? */
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bool astIsFloat(const Token *tok, bool unknown);
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/** Is expression of boolean type? */
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bool astIsBool(const Token *tok);
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bool astIsPointer(const Token *tok);
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bool astIsSmartPointer(const Token* tok);
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bool astIsUniqueSmartPointer(const Token* tok);
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bool astIsIterator(const Token *tok);
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bool astIsContainer(const Token *tok);
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bool astIsContainerView(const Token* tok);
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bool astIsContainerOwned(const Token* tok);
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bool astIsContainerString(const Token* tok);
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Library::Container::Action astContainerAction(const Token* tok, const Token** ftok = nullptr);
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Library::Container::Yield astContainerYield(const Token* tok, const Token** ftok = nullptr);
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Library::Container::Yield astFunctionYield(const Token* tok, const Settings* settings, const Token** ftok = nullptr);
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/** Is given token a range-declaration in a range-based for loop */
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bool astIsRangeBasedForDecl(const Token* tok);
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/**
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* Get canonical type of expression. const/static/etc are not included and neither *&.
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* For example:
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* Expression type Return
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* std::string std::string
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* int * int
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* static const int int
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* std::vector<T> std::vector
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*/
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std::string astCanonicalType(const Token *expr, bool pointedToType);
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/** Is given syntax tree a variable comparison against value */
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const Token * astIsVariableComparison(const Token *tok, const std::string &comp, const std::string &rhs, const Token **vartok=nullptr);
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bool isVariableDecl(const Token* tok);
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bool isStlStringType(const Token* tok);
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bool isTemporary(bool cpp, const Token* tok, const Library* library, bool unknown = false);
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const Token* previousBeforeAstLeftmostLeaf(const Token* tok);
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Token* previousBeforeAstLeftmostLeaf(Token* tok);
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CPPCHECKLIB const Token * nextAfterAstRightmostLeaf(const Token * tok);
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Token* nextAfterAstRightmostLeaf(Token* tok);
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Token* astParentSkipParens(Token* tok);
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const Token* astParentSkipParens(const Token* tok);
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const Token* getParentMember(const Token * tok);
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const Token* getParentLifetime(const Token* tok);
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const Token* getParentLifetime(bool cpp, const Token* tok, const Library* library);
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std::vector<ValueType> getParentValueTypes(const Token* tok,
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const Settings* settings = nullptr,
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const Token** parent = nullptr);
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bool astIsLHS(const Token* tok);
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bool astIsRHS(const Token* tok);
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Token* getCondTok(Token* tok);
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const Token* getCondTok(const Token* tok);
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Token* getInitTok(Token* tok);
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const Token* getInitTok(const Token* tok);
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Token* getStepTok(Token* tok);
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const Token* getStepTok(const Token* tok);
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Token* getCondTokFromEnd(Token* endBlock);
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const Token* getCondTokFromEnd(const Token* endBlock);
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/// For a "break" token, locate the next token to execute. The token will
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/// be either a "}" or a ";".
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const Token *findNextTokenFromBreak(const Token *breakToken);
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/**
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* Extract for loop values: loopvar varid, init value, step value, last value (inclusive)
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*/
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bool extractForLoopValues(const Token *forToken,
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nonneg int &varid,
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bool &knownInitValue,
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long long &initValue,
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bool &partialCond,
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long long &stepValue,
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long long &lastValue);
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bool precedes(const Token * tok1, const Token * tok2);
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bool succeeds(const Token* tok1, const Token* tok2);
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bool exprDependsOnThis(const Token* expr, bool onVar = true, nonneg int depth = 0);
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struct ReferenceToken {
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const Token* token;
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ErrorPath errors;
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};
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SmallVector<ReferenceToken> followAllReferences(const Token* tok,
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bool temporary = true,
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bool inconclusive = true,
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ErrorPath errors = ErrorPath{},
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int depth = 20);
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const Token* followReferences(const Token* tok, ErrorPath* errors = nullptr);
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CPPCHECKLIB bool isSameExpression(bool cpp, bool macro, const Token *tok1, const Token *tok2, const Library& library, bool pure, bool followVar, ErrorPath* errors=nullptr);
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bool isEqualKnownValue(const Token * const tok1, const Token * const tok2);
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bool isStructuredBindingVariable(const Variable* var);
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const Token* isInLoopCondition(const Token* tok);
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/**
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* Is token used as boolean, that is to say cast to a bool, or used as a condition in a if/while/for
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*/
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CPPCHECKLIB bool isUsedAsBool(const Token* const tok, const Settings* settings = nullptr);
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/**
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* Are two conditions opposite
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* @param isNot do you want to know if cond1 is !cond2 or if cond1 and cond2 are non-overlapping. true: cond1==!cond2 false: cond1==true => cond2==false
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* @param cpp c++ file
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* @param cond1 condition1
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* @param cond2 condition2
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* @param library files data
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* @param pure boolean
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*/
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bool isOppositeCond(bool isNot, bool cpp, const Token * const cond1, const Token * const cond2, const Library& library, bool pure, bool followVar, ErrorPath* errors=nullptr);
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bool isOppositeExpression(bool cpp, const Token * const tok1, const Token * const tok2, const Library& library, bool pure, bool followVar, ErrorPath* errors=nullptr);
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bool isConstFunctionCall(const Token* ftok, const Library& library);
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bool isConstExpression(const Token *tok, const Library& library, bool cpp);
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bool isWithoutSideEffects(bool cpp, const Token* tok, bool checkArrayAccess = false, bool checkReference = true);
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bool isUniqueExpression(const Token* tok);
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bool isEscapeFunction(const Token* ftok, const Library* library);
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/** Is scope a return scope (scope will unconditionally return) */
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CPPCHECKLIB bool isReturnScope(const Token* const endToken,
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const Library* library = nullptr,
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const Token** unknownFunc = nullptr,
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bool functionScope = false);
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/** Is tok within a scope of the given type, nested within var's scope? */
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bool isWithinScope(const Token* tok,
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const Variable* var,
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Scope::ScopeType type);
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/// Return the token to the function and the argument number
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const Token * getTokenArgumentFunction(const Token * tok, int& argn);
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Token* getTokenArgumentFunction(Token* tok, int& argn);
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std::vector<const Variable*> getArgumentVars(const Token* tok, int argnr);
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/** Is variable changed by function call?
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* In case the answer of the question is inconclusive, e.g. because the function declaration is not known
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* the return value is false and the output parameter inconclusive is set to true
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*
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* @param tok ast tree
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* @param varid Variable Id
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* @param settings program settings
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* @param inconclusive pointer to output variable which indicates that the answer of the question is inconclusive
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*/
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bool isVariableChangedByFunctionCall(const Token *tok, int indirect, nonneg int varid, const Settings *settings, bool *inconclusive);
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/** Is variable changed by function call?
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* In case the answer of the question is inconclusive, e.g. because the function declaration is not known
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* the return value is false and the output parameter inconclusive is set to true
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*
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* @param tok token of variable in function call
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* @param settings program settings
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* @param inconclusive pointer to output variable which indicates that the answer of the question is inconclusive
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*/
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CPPCHECKLIB bool isVariableChangedByFunctionCall(const Token *tok, int indirect, const Settings *settings, bool *inconclusive);
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/** Is variable changed in block of code? */
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CPPCHECKLIB bool isVariableChanged(const Token *start, const Token *end, const nonneg int exprid, bool globalvar, const Settings *settings, bool cpp, int depth = 20);
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bool isVariableChanged(const Token *start, const Token *end, int indirect, const nonneg int exprid, bool globalvar, const Settings *settings, bool cpp, int depth = 20);
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bool isVariableChanged(const Token *tok, int indirect, const Settings *settings, bool cpp, int depth = 20);
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bool isVariableChanged(const Variable * var, const Settings *settings, bool cpp, int depth = 20);
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bool isVariablesChanged(const Token* start,
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const Token* end,
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int indirect,
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const std::vector<const Variable*> &vars,
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const Settings* settings,
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bool cpp);
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bool isThisChanged(const Token* tok, int indirect, const Settings* settings, bool cpp);
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bool isThisChanged(const Token* start, const Token* end, int indirect, const Settings* settings, bool cpp);
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const Token* findVariableChanged(const Token *start, const Token *end, int indirect, const nonneg int exprid, bool globalvar, const Settings *settings, bool cpp, int depth = 20);
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Token* findVariableChanged(Token *start, const Token *end, int indirect, const nonneg int exprid, bool globalvar, const Settings *settings, bool cpp, int depth = 20);
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CPPCHECKLIB bool isExpressionChanged(const Token* expr,
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const Token* start,
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const Token* end,
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const Settings* settings,
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bool cpp,
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int depth = 20);
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bool isExpressionChangedSkipDeadCode(const Token* expr,
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const Token* start,
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const Token* end,
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const Settings* settings,
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bool cpp,
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const std::function<std::vector<MathLib::bigint>(const Token* tok)>& evaluate,
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int depth = 20);
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bool isExpressionChangedAt(const Token* expr,
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const Token* tok,
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int indirect,
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bool globalvar,
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const Settings* settings,
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bool cpp,
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int depth = 20);
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/// If token is an alias if another variable
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bool isAliasOf(const Token *tok, nonneg int varid, bool* inconclusive = nullptr);
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bool isAliasOf(const Token* tok, const Token* expr, int* indirect = nullptr, bool* inconclusive = nullptr);
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bool isAliased(const Variable *var);
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const Token* getArgumentStart(const Token* ftok);
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/** Determines the number of arguments - if token is a function call or macro
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* @param ftok start token which is supposed to be the function/macro name.
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* @return Number of arguments
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*/
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int numberOfArguments(const Token* ftok);
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/// Get number of arguments without using AST
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int numberOfArgumentsWithoutAst(const Token* start);
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/**
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* Get arguments (AST)
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*/
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std::vector<const Token *> getArguments(const Token *ftok);
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int getArgumentPos(const Variable* var, const Function* f);
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const Token* getIteratorExpression(const Token* tok);
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/**
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* Are the arguments a pair of iterators/pointers?
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*/
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bool isIteratorPair(std::vector<const Token*> args);
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CPPCHECKLIB const Token *findLambdaStartToken(const Token *last);
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/**
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* find lambda function end token
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* \param first The [ token
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* \return nullptr or the }
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*/
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CPPCHECKLIB const Token *findLambdaEndToken(const Token *first);
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CPPCHECKLIB Token* findLambdaEndToken(Token* first);
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bool isLikelyStream(bool cpp, const Token *stream);
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/**
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* do we see a likely write of rhs through overloaded operator
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* s >> x;
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* a & x;
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*/
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bool isLikelyStreamRead(bool cpp, const Token *op);
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bool isCPPCast(const Token* tok);
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bool isConstVarExpression(const Token* tok, std::function<bool(const Token*)> skipPredicate = nullptr);
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enum class ExprUsage { None, NotUsed, PassedByReference, Used, Inconclusive };
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ExprUsage getExprUsage(const Token* tok, int indirect, const Settings* settings, bool cpp);
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const Variable *getLHSVariable(const Token *tok);
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const Token* getLHSVariableToken(const Token* tok);
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std::vector<const Variable*> getLHSVariables(const Token* tok);
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/** Find a allocation function call in expression, so result of expression is allocated memory/resource. */
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const Token* findAllocFuncCallToken(const Token *expr, const Library &library);
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bool isScopeBracket(const Token* tok);
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CPPCHECKLIB bool isNullOperand(const Token *expr);
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bool isGlobalData(const Token *expr, bool cpp);
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bool isUnevaluated(const Token *tok);
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#endif // astutilsH
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