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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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2
glslang/Include/revision.h
View File

@ -2,5 +2,5 @@
// For the version, it uses the latest git tag followed by the number of commits.
// For the date, it uses the current date (when then script is run).
#define GLSLANG_REVISION "Overload400-PrecQual.1720"
#define GLSLANG_REVISION "Overload400-PrecQual.1721"
#define GLSLANG_DATE "21-Dec-2016"

46
glslang/MachineIndependent/preprocessor/Pp.cpp
View File

@ -105,7 +105,7 @@ int TPpContext::CPPdefine(TPpToken* ppToken)
}
// save the macro name
const int defAtom = LookUpAddString(ppToken->name);
const int defAtom = atomStrings.getAddAtom(ppToken->name);
// gather parameters to the macro, between (...)
token = scanToken(ppToken);
@ -121,7 +121,7 @@ int TPpContext::CPPdefine(TPpToken* ppToken)
return token;
}
mac.emptyArgs = 0;
const int argAtom = LookUpAddString(ppToken->name);
const int argAtom = atomStrings.getAddAtom(ppToken->name);
// check for duplication of parameter name
bool duplicate = false;
@ -162,10 +162,10 @@ int TPpContext::CPPdefine(TPpToken* ppToken)
// "Two replacement lists are identical if and only if the preprocessing tokens in both have the same number,
// ordering, spelling, and white-space separation, where all white-space separations are considered identical."
if (existing->args.size() != mac.args.size() || existing->emptyArgs != mac.emptyArgs)
parseContext.ppError(defineLoc, "Macro redefined; different number of arguments:", "#define", GetAtomString(defAtom));
parseContext.ppError(defineLoc, "Macro redefined; different number of arguments:", "#define", atomStrings.getString(defAtom));
else {
if (existing->args != mac.args)
parseContext.ppError(defineLoc, "Macro redefined; different argument names:", "#define", GetAtomString(defAtom));
parseContext.ppError(defineLoc, "Macro redefined; different argument names:", "#define", atomStrings.getString(defAtom));
RewindTokenStream(existing->body);
RewindTokenStream(mac.body);
int newToken;
@ -176,7 +176,7 @@ int TPpContext::CPPdefine(TPpToken* ppToken)
oldToken = ReadToken(existing->body, &oldPpToken);
newToken = ReadToken(mac.body, &newPpToken);
if (oldToken != newToken || oldPpToken != newPpToken) {
parseContext.ppError(defineLoc, "Macro redefined; different substitutions:", "#define", GetAtomString(defAtom));
parseContext.ppError(defineLoc, "Macro redefined; different substitutions:", "#define", atomStrings.getString(defAtom));
break;
}
} while (newToken > 0);
@ -201,7 +201,7 @@ int TPpContext::CPPundef(TPpToken* ppToken)
parseContext.reservedPpErrorCheck(ppToken->loc, ppToken->name, "#undef");
MacroSymbol* macro = lookupMacroDef(LookUpString(ppToken->name));
MacroSymbol* macro = lookupMacroDef(atomStrings.getAtom(ppToken->name));
if (macro != nullptr)
macro->undef = 1;
token = scanToken(ppToken);
@ -236,7 +236,7 @@ int TPpContext::CPPelse(int matchelse, TPpToken* ppToken)
if ((token = scanToken(ppToken)) != PpAtomIdentifier)
continue;
int nextAtom = LookUpString(ppToken->name);
int nextAtom = atomStrings.getAtom(ppToken->name);
if (nextAtom == PpAtomIf || nextAtom == PpAtomIfdef || nextAtom == PpAtomIfndef) {
depth++;
ifdepth++;
@ -405,7 +405,7 @@ int TPpContext::eval(int token, int precedence, bool shortCircuit, int& res, boo
return token;
}
MacroSymbol* macro = lookupMacroDef(LookUpString(ppToken->name));
MacroSymbol* macro = lookupMacroDef(atomStrings.getAtom(ppToken->name));
res = macro != nullptr ? !macro->undef : 0;
token = scanToken(ppToken);
if (needclose) {
@ -557,7 +557,7 @@ int TPpContext::CPPifdef(int defined, TPpToken* ppToken)
else
parseContext.ppError(ppToken->loc, "must be followed by macro name", "#ifndef", "");
} else {
MacroSymbol* macro = lookupMacroDef(LookUpString(ppToken->name));
MacroSymbol* macro = lookupMacroDef(atomStrings.getAtom(ppToken->name));
token = scanToken(ppToken);
if (token != '\n') {
parseContext.ppError(ppToken->loc, "unexpected tokens following #ifdef directive - expected a newline", "#ifdef", "");
@ -651,7 +651,7 @@ int TPpContext::CPPline(TPpToken* ppToken)
// We need to save a copy of the string instead of pointing
// to the name field of the token since the name field
// will likely be overwritten by the next token scan.
sourceName = GetAtomString(LookUpAddString(ppToken->name));
sourceName = atomStrings.getString(atomStrings.getAddAtom(ppToken->name));
parseContext.setCurrentSourceName(sourceName);
hasFile = true;
token = scanToken(ppToken);
@ -690,7 +690,7 @@ int TPpContext::CPPerror(TPpToken* ppToken)
} else if (token == PpAtomIdentifier || token == PpAtomConstString) {
message.append(ppToken->name);
} else {
message.append(GetAtomString(token));
message.append(atomStrings.getString(token));
}
message.append(" ");
token = scanToken(ppToken);
@ -767,7 +767,7 @@ int TPpContext::CPPversion(TPpToken* ppToken)
parseContext.notifyVersion(line, versionNumber, nullptr);
return token;
} else {
int profileAtom = LookUpString(ppToken->name);
int profileAtom = atomStrings.getAtom(ppToken->name);
if (profileAtom != PpAtomCore &&
profileAtom != PpAtomCompatibility &&
profileAtom != PpAtomEs)
@ -831,7 +831,7 @@ int TPpContext::readCPPline(TPpToken* ppToken)
int token = scanToken(ppToken);
if (token == PpAtomIdentifier) {
switch (LookUpString(ppToken->name)) {
switch (atomStrings.getAtom(ppToken->name)) {
case PpAtomDefine:
token = CPPdefine(ppToken);
break;
@ -922,7 +922,7 @@ TPpContext::TokenStream* TPpContext::PrescanMacroArg(TokenStream& arg, TPpToken*
RewindTokenStream(arg);
do {
token = ReadToken(arg, ppToken);
if (token == PpAtomIdentifier && lookupMacroDef(LookUpString(ppToken->name)) != nullptr)
if (token == PpAtomIdentifier && lookupMacroDef(atomStrings.getAtom(ppToken->name)) != nullptr)
break;
} while (token != EndOfInput);
@ -992,7 +992,7 @@ int TPpContext::tMacroInput::scan(TPpToken* ppToken)
if (token == PpAtomIdentifier) {
int i;
for (i = mac->args.size() - 1; i >= 0; i--)
if (strcmp(pp->GetAtomString(mac->args[i]), ppToken->name) == 0)
if (strcmp(pp->atomStrings.getString(mac->args[i]), ppToken->name) == 0)
break;
if (i >= 0) {
TokenStream* arg = expandedArgs[i];
@ -1060,7 +1060,7 @@ int TPpContext::tZeroInput::scan(TPpToken* ppToken)
int TPpContext::MacroExpand(TPpToken* ppToken, bool expandUndef, bool newLineOkay)
{
ppToken->space = false;
int macroAtom = LookUpString(ppToken->name);
int macroAtom = atomStrings.getAtom(ppToken->name);
switch (macroAtom) {
case PpAtomLineMacro:
ppToken->ival = parseContext.getCurrentLoc().line;
@ -1116,7 +1116,7 @@ int TPpContext::MacroExpand(TPpToken* ppToken, bool expandUndef, bool newLineOka
token = scanToken(ppToken);
}
if (token != '(') {
parseContext.ppError(loc, "expected '(' following", "macro expansion", GetAtomString(macroAtom));
parseContext.ppError(loc, "expected '(' following", "macro expansion", atomStrings.getString(macroAtom));
UngetToken(token, ppToken);
delete in;
return 0;
@ -1134,20 +1134,20 @@ int TPpContext::MacroExpand(TPpToken* ppToken, bool expandUndef, bool newLineOka
while (1) {
token = scanToken(ppToken);
if (token == EndOfInput) {
parseContext.ppError(loc, "End of input in macro", "macro expansion", GetAtomString(macroAtom));
parseContext.ppError(loc, "End of input in macro", "macro expansion", atomStrings.getString(macroAtom));
delete in;
return 0;
}
if (token == '\n') {
if (! newLineOkay) {
parseContext.ppError(loc, "End of line in macro substitution:", "macro expansion", GetAtomString(macroAtom));
parseContext.ppError(loc, "End of line in macro substitution:", "macro expansion", atomStrings.getString(macroAtom));
delete in;
return 0;
}
continue;
}
if (token == '#') {
parseContext.ppError(ppToken->loc, "unexpected '#'", "macro expansion", GetAtomString(macroAtom));
parseContext.ppError(ppToken->loc, "unexpected '#'", "macro expansion", atomStrings.getString(macroAtom));
delete in;
return 0;
}
@ -1172,7 +1172,7 @@ int TPpContext::MacroExpand(TPpToken* ppToken, bool expandUndef, bool newLineOka
} while (arg < in->mac->args.size());
if (arg < in->mac->args.size())
parseContext.ppError(loc, "Too few args in Macro", "macro expansion", GetAtomString(macroAtom));
parseContext.ppError(loc, "Too few args in Macro", "macro expansion", atomStrings.getString(macroAtom));
else if (token != ')') {
depth=0;
while (token != EndOfInput && (depth > 0 || token != ')')) {
@ -1184,11 +1184,11 @@ int TPpContext::MacroExpand(TPpToken* ppToken, bool expandUndef, bool newLineOka
}
if (token == EndOfInput) {
parseContext.ppError(loc, "End of input in macro", "macro expansion", GetAtomString(macroAtom));
parseContext.ppError(loc, "End of input in macro", "macro expansion", atomStrings.getString(macroAtom));
delete in;
return 0;
}
parseContext.ppError(loc, "Too many args in macro", "macro expansion", GetAtomString(macroAtom));
parseContext.ppError(loc, "Too many args in macro", "macro expansion", atomStrings.getString(macroAtom));
}
// We need both expanded and non-expanded forms of the argument, for whether or

59
glslang/MachineIndependent/preprocessor/PpAtom.cpp
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@ -149,62 +149,13 @@ const struct {
namespace glslang {
//
// Map an existing string to an atom.
//
// Return 0 if no existing string.
//
int TPpContext::LookUpString(const char* s)
{
auto it = atomMap.find(s);
return it == atomMap.end() ? 0 : it->second;
}
//
// Map a new or existing string to an atom, inventing a new atom if necessary.
//
int TPpContext::LookUpAddString(const char* s)
{
int atom = LookUpString(s);
if (atom == 0) {
atom = nextAtom++;
AddAtomFixed(s, atom);
}
return atom;
}
//
// Lookup up mapping of atom -> string.
//
const char* TPpContext::GetAtomString(int atom)
{
if ((size_t)atom >= stringMap.size())
return "<bad token>";
const TString* atomString = stringMap[atom];
return atomString ? atomString->c_str() : "<bad token>";
}
//
// Add mappings:
// - string -> atom
// - atom -> string
//
void TPpContext::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, 0);
stringMap[atom] = &it->first;
}
//
// Initialize the atom table.
//
void TPpContext::InitAtomTable()
TStringAtomMap::TStringAtomMap()
{
badToken.assign("<bad token>");
// Add single character tokens to the atom table:
const char* s = "~!%^&*()-+=|,.<>/?;:[]{}#\\";
char t[2];
@ -212,13 +163,13 @@ void TPpContext::InitAtomTable()
t[1] = '\0';
while (*s) {
t[0] = *s;
AddAtomFixed(t, s[0]);
addAtomFixed(t, s[0]);
s++;
}
// Add multiple character scanner tokens :
for (size_t ii = 0; ii < sizeof(tokens)/sizeof(tokens[0]); ii++)
AddAtomFixed(tokens[ii].str, tokens[ii].val);
addAtomFixed(tokens[ii].str, tokens[ii].val);
nextAtom = PpAtomLast;
}

2
glslang/MachineIndependent/preprocessor/PpContext.cpp
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@ -87,8 +87,6 @@ TPpContext::TPpContext(TParseContextBase& pc, const std::string& rootFileName, T
rootFileName(rootFileName),
currentSourceFile(rootFileName)
{
InitAtomTable();
ifdepth = 0;
for (elsetracker = 0; elsetracker < maxIfNesting; elsetracker++)
elseSeen[elsetracker] = false;

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

8
glslang/MachineIndependent/preprocessor/PpScanner.cpp
View File

@ -774,7 +774,7 @@ int TPpContext::tokenize(TPpToken& ppToken)
parseContext.ppError(ppToken.loc, "character literals not supported", "\'", "");
continue;
default:
strcpy(ppToken.name, GetAtomString(token));
strcpy(ppToken.name, atomStrings.getString(token));
break;
}
@ -836,8 +836,8 @@ int TPpContext::tokenPaste(int token, TPpToken& ppToken)
case PpAtomAnd:
case PpAtomOr:
case PpAtomXor:
strcpy(ppToken.name, GetAtomString(resultToken));
strcpy(pastedPpToken.name, GetAtomString(token));
strcpy(ppToken.name, atomStrings.getString(resultToken));
strcpy(pastedPpToken.name, atomStrings.getString(token));
break;
default:
parseContext.ppError(ppToken.loc, "not supported for these tokens", "##", "");
@ -853,7 +853,7 @@ int TPpContext::tokenPaste(int token, TPpToken& ppToken)
// correct the kind of token we are making, if needed (identifiers stay identifiers)
if (resultToken != PpAtomIdentifier) {
int newToken = LookUpString(ppToken.name);
int newToken = atomStrings.getAtom(ppToken.name);
if (newToken > 0)
resultToken = newToken;
else