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Fix ticket #306 (Invalid multi-line comment produces cryptic internal error) 

http://apps.sourceforge.net/trac/cppcheck/ticket/306
This commit is contained in:
Reijo Tomperi 2009-05-13 22:18:02 +03:00
parent 997a784bb6
commit e5e82274dc
3 changed files with 147 additions and 79 deletions
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172
src/preprocessor.cpp
View File

@ -71,9 +71,6 @@ std::string Preprocessor::read(std::istream &istr)
std::ostringstream code;
for (char ch = readChar(istr); istr.good(); ch = readChar(istr))
{
if (ch < 0)
throw std::runtime_error("The code contains characters that are unhandled");
if (ch == '\n')
++lineno;
@ -84,7 +81,7 @@ std::string Preprocessor::read(std::istream &istr)
// Skip spaces after ' ' and after '#'
if (ch == ' ' && ignoreSpace)
continue;
ignoreSpace = bool(ch == ' ' || ch == '#' || ch == '/');
ignoreSpace = bool(ch == ' ' || ch == '#' || ch == '/' || ch == '\n');
if (needSpace)
{
@ -96,68 +93,8 @@ std::string Preprocessor::read(std::istream &istr)
if (ch == '#')
needSpace = true;
// Remove comments..
if (ch == '/')
{
char chNext = readChar(istr);
if (chNext == '/')
{
while (istr.good() && ch != '\n')
ch = readChar(istr);
code << "\n";
++lineno;
}
else if (chNext == '*')
{
char chPrev = 0;
while (istr.good() && (chPrev != '*' || ch != '/'))
{
chPrev = ch;
ch = readChar(istr);
if (ch == '\n')
{
code << "\n";
++lineno;
}
}
}
else
{
if (chNext == '\n')
++lineno;
code << std::string(1, ch) << std::string(1, chNext);
}
}
// String or char constants..
else if (ch == '\"' || ch == '\'')
{
code << std::string(1, ch);
char chNext;
do
{
chNext = (char)istr.get();
if (chNext == '\\')
{
char chSeq = readChar(istr);
if (chSeq == '\n')
++newlines;
else
{
code << std::string(1, chNext);
code << std::string(1, chSeq);
}
}
else
code << std::string(1, chNext);
}
while (istr.good() && chNext != ch);
}
// <backspace><newline>..
else if (ch == '\\')
if (ch == '\\')
{
char chNext = 0;
while (true)
@ -197,6 +134,111 @@ std::string Preprocessor::read(std::istream &istr)
}
}
return removeComments(code.str());
}
std::string Preprocessor::removeComments(const std::string &str)
{
// For the error report
int lineno = 1;
// handling <backspace><newline>
// when this is encountered the <backspace><newline> will be "skipped".
// on the next <newline>, extra newlines will be added
unsigned int newlines = 0;
std::ostringstream code;
for (std::string::size_type i = 0; i < str.length(); ++i)
{
char ch = str[i];
if (ch < 0)
throw std::runtime_error("The code contains characters that are unhandled");
// Remove comments..
if (ch == '/')
{
++i;
char chNext = str[i];
if (chNext == '/')
{
while (i < str.length() && ch != '\n')
{
++i;
ch = str[i];
}
code << "\n";
++lineno;
}
else if (chNext == '*')
{
char chPrev = 0;
while (i < str.length() && (chPrev != '*' || ch != '/'))
{
chPrev = ch;
++i;
ch = str[i];
if (ch == '\n')
{
code << "\n";
++lineno;
}
}
}
else
{
if (chNext == '\n')
++lineno;
code << std::string(1, ch) << std::string(1, chNext);
}
}
// String or char constants..
else if (ch == '\"' || ch == '\'')
{
code << std::string(1, ch);
char chNext;
do
{
++i;
chNext = str[i];
if (chNext == '\\')
{
++i;
char chSeq = str[i];
if (chSeq == '\n')
++newlines;
else
{
code << std::string(1, chNext);
code << std::string(1, chSeq);
}
}
else
code << std::string(1, chNext);
}
while (i < str.length() && chNext != ch);
}
// Just some code..
else
{
code << std::string(1, ch);
// if there has been <backspace><newline> sequences, add extra newlines..
if (ch == '\n' && newlines > 0)
{
code << std::string(newlines, '\n');
newlines = 0;
}
}
}
return code.str();
}

7
src/preprocessor.h
View File

@ -86,6 +86,13 @@ protected:
static std::string expandMacros(std::string code, const std::string &filename, ErrorLogger *errorLogger);
/**
* Remove comments from code. This should only be called from read().
* @param str Code processed by read().
* @return code without comments
*/
static std::string removeComments(const std::string &str);
private:
/**

21
test/testpreprocessor.cpp
View File

@ -382,6 +382,7 @@ private:
void comments1()
{
{
const char filedata[] = "/*\n"
"#ifdef WIN32\n"
@ -399,6 +400,24 @@ private:
ASSERT_EQUALS(1, static_cast<unsigned int>(actual.size()));
}
{
const char filedata[] = "/*\n"
"\x080 #ifdef WIN32\n"
"#endif\n"
"*/\n";
// Preprocess => actual result..
std::istringstream istr(filedata);
std::map<std::string, std::string> actual;
Preprocessor preprocessor;
preprocessor.preprocess(istr, actual, "file.c");
// Compare results..
ASSERT_EQUALS("\n\n\n\n", actual[""]);
ASSERT_EQUALS(1, static_cast<unsigned int>(actual.size()));
}
}
void if0()
@ -944,7 +963,7 @@ private:
// Compare results..
ASSERT_EQUALS(1, static_cast<unsigned int>(actual.size()));
TODO_ASSERT_EQUALS("\n\nvoid f() { }\n", actual[""]);
ASSERT_EQUALS("\n\nvoid f() { }\n", actual[""]);
ASSERT_EQUALS("", errout.str());
}