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PP: Non-functional: Make a proper class out of the atom <-> string mapping.

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This commit is contained in:
John Kessenich 2016-12-21 13:49:16 -07:00
parent 224b1f733b
commit f48faec3ee
6 changed files with 90 additions and 99 deletions
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72
glslang/MachineIndependent/preprocessor/PpContext.h
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@ -115,6 +115,62 @@ public:
char name[MaxTokenLength + 1];
};
class TStringAtomMap {
//
// Implementation is in PpAtom.cpp
//
// Maintain a bi-directional mapping between relevant preprocessor strings and
// "atoms" which a unique integers (small, contiguous, not hash-like) per string.
//
public:
TStringAtomMap();
// Map string -> atom.
// Return 0 if no existing string.
int getAtom(const char* s) const
{
auto it = atomMap.find(s);
return it == atomMap.end() ? 0 : it->second;
}
// Map a new or existing string -> atom, inventing a new atom if necessary.
int getAddAtom(const char* s)
{
int atom = getAtom(s);
if (atom == 0) {
atom = nextAtom++;
addAtomFixed(s, atom);
}
return atom;
}
// Map atom -> string.
const char* getString(int atom) const { return stringMap[atom]->c_str(); }
protected:
TStringAtomMap(TStringAtomMap&);
TStringAtomMap& operator=(TStringAtomMap&);
TUnorderedMap<TString, int> atomMap;
TVector<const TString*> stringMap; // these point into the TString in atomMap
int nextAtom;
// Bad source characters can lead to bad atoms, so gracefully handle those by
// pre-filling the table with them (to avoid if tests later).
TString badToken;
// Add bi-directional mappings:
// - string -> atom
// - atom -> string
void addAtomFixed(const char* s, int atom)
{
auto it = atomMap.insert(std::pair<TString, int>(s, atom)).first;
if (stringMap.size() < (size_t)atom + 1)
stringMap.resize(atom + 100, &badToken);
stringMap[atom] = &it->first;
}
};
class TInputScanner;
// This class is the result of turning a huge pile of C code communicating through globals
@ -196,6 +252,7 @@ protected:
TPpContext(TPpContext&);
TPpContext& operator=(TPpContext&);
TStringAtomMap atomStrings;
char* preamble; // string to parse, all before line 1 of string 0, it is 0 if no preamble
int preambleLength;
char** strings; // official strings of shader, starting a string 0 line 1
@ -538,21 +595,6 @@ protected:
std::string rootFileName;
std::stack<TShader::Includer::IncludeResult*> includeStack;
std::string currentSourceFile;
//
// From PpAtom.cpp
//
typedef TUnorderedMap<TString, int> TAtomMap;
typedef TVector<const TString*> TStringMap;
TAtomMap atomMap;
TStringMap stringMap;
int nextAtom;
void InitAtomTable();
void AddAtomFixed(const char* s, int atom);
int LookUpString(const char* s);
int LookUpAddString(const char* s);
const char* GetAtomString(int atom);
};
} // end namespace glslang