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Improved performance of CheckBufferOverrun::checkScope() (#5944): 

-> Speedup by 40% (MSVC12, x64, not matchcompiled) on the file attached to the ticket
This commit is contained in:
PKEuS 2014-06-23 19:06:31 +02:00
parent 1ae6531c4c
commit 2d54bace1b
2 changed files with 78 additions and 79 deletions
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7
lib/checkbufferoverrun.cpp
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@ -572,7 +572,7 @@ void CheckBufferOverrun::parse_for_body(const Token *tok, const ArrayInfo &array
}
void CheckBufferOverrun::checkFunctionParameter(const Token &tok, unsigned int par, const ArrayInfo &arrayInfo, std::list<const Token *> callstack)
void CheckBufferOverrun::checkFunctionParameter(const Token &tok, unsigned int par, const ArrayInfo &arrayInfo, const std::list<const Token *>& callstack)
{
// total_size : which parameter in function call takes the total size?
std::map<std::string, unsigned int> total_size;
@ -1279,9 +1279,7 @@ void CheckBufferOverrun::checkScope(const Token *tok, const ArrayInfo &arrayInfo
// Check function call..
if (Token::Match(tok, "%var% (")) {
const std::list<const Token *> callstack;
checkFunctionCall(tok, arrayInfo, callstack);
}
checkFunctionCall(tok, arrayInfo, std::list<const Token*>());
if (Token::Match(tok, "strncpy|memcpy|memmove ( %varid% , %str% , %num% )", declarationId)) {
const unsigned int num = (unsigned int)MathLib::toLongNumber(tok->strAt(6));
@ -1369,6 +1367,7 @@ void CheckBufferOverrun::checkScope(const Token *tok, const ArrayInfo &arrayInfo
if (_settings->standards.posix && Token::Match(tok, "readlink|readlinkat ("))
checkReadlinkBufferUsage(tok, scope_begin, declarationId, total_size);
}
// undefined behaviour: result of pointer arithmetic is out of bounds
if (isPortabilityEnabled && Token::Match(tok, "= %varid% + %num% ;", declarationId)) {
const MathLib::bigint index = MathLib::toLongNumber(tok->strAt(3));

2
lib/checkbufferoverrun.h
View File

@ -192,7 +192,7 @@ public:
* \param arrayInfo the array information
* \param callstack call stack. This is used to prevent recursion and to provide better error messages. Pass a empty list from checkScope etc.
*/
void checkFunctionParameter(const Token &tok, const unsigned int par, const ArrayInfo &arrayInfo, std::list<const Token *> callstack);
void checkFunctionParameter(const Token &tok, const unsigned int par, const ArrayInfo &arrayInfo, const std::list<const Token *>& callstack);
/**
* Helper function that checks if the array is used and if so calls the checkFunctionCall