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glslang/glslang/MachineIndependent/preprocessor/Pp.cpp
John Kessenich fcb4ed054c Preprocessor: Rationalize, simplify, and correct the stack of input sources and their tokenization. This included 
- consistently dealing with EOF and its effect on error recovery (bug 11444, #1)
 - turning a simulated OO hierarchy of function pointers and typecasting into a real C++ class hierarchy
 - correctly handling '\' everywhere, in all classes of tokens, as a layer before preprocessing itself
 - conditionally handling '\n' in macro expansion input, depending on whether it is in a macro expression or not
 - delete some unused "memory cleanup" code


git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24626 e7fa87d3-cd2b-0410-9028-fcbf551c1848
2013-12-30 20:34:28 +00:00

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//
//Copyright (C) 2002-2005 3Dlabs Inc. Ltd.
//Copyright (C) 2013 LunarG, Inc.
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//
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//
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//
// cpp.c
//
#define _CRT_SECURE_NO_WARNINGS
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "PpContext.h"
#include "PpTokens.h"
namespace glslang {
int TPpContext::InitCPP()
{
// Add various atoms needed by the CPP line scanner:
bindAtom = LookUpAddString("bind");
constAtom = LookUpAddString("const");
defaultAtom = LookUpAddString("default");
defineAtom = LookUpAddString("define");
definedAtom = LookUpAddString("defined");
elifAtom = LookUpAddString("elif");
elseAtom = LookUpAddString("else");
endifAtom = LookUpAddString("endif");
ifAtom = LookUpAddString("if");
ifdefAtom = LookUpAddString("ifdef");
ifndefAtom = LookUpAddString("ifndef");
includeAtom = LookUpAddString("include");
lineAtom = LookUpAddString("line");
pragmaAtom = LookUpAddString("pragma");
texunitAtom = LookUpAddString("texunit");
undefAtom = LookUpAddString("undef");
errorAtom = LookUpAddString("error");
__LINE__Atom = LookUpAddString("__LINE__");
__FILE__Atom = LookUpAddString("__FILE__");
__VERSION__Atom = LookUpAddString("__VERSION__");
versionAtom = LookUpAddString("version");
coreAtom = LookUpAddString("core");
compatibilityAtom = LookUpAddString("compatibility");
esAtom = LookUpAddString("es");
extensionAtom = LookUpAddString("extension");
pool = mem_CreatePool(0, 0);
return 1;
}
// Handle #define
int TPpContext::CPPdefine(TPpToken* ppToken)
{
MacroSymbol mac;
Symbol *symb;
// get macro name
int token = scanToken(ppToken);
if (token != CPP_IDENTIFIER) {
parseContext.error(ppToken->loc, "must be followed by macro name", "#define", "");
return token;
}
int atom = ppToken->atom;
const char* definedName = GetAtomString(atom);
if (ppToken->loc.string >= 0) {
// We are in user code; check for reserved name use:
parseContext.reservedPpErrorCheck(ppToken->loc, definedName, "#define");
}
// gather parameters to the macro, between (...)
token = scanToken(ppToken);
if (token == '(' && ! ppToken->space) {
int argc = 0;
int args[maxMacroArgs];
do {
token = scanToken(ppToken);
if (argc == 0 && token == ')')
break;
if (token != CPP_IDENTIFIER) {
parseContext.error(ppToken->loc, "bad argument", "#define", "");
return token;
}
// check for duplication of parameter name
bool duplicate = false;
for (int a = 0; a < argc; ++a) {
if (args[a] == ppToken->atom) {
parseContext.error(ppToken->loc, "duplicate macro parameter", "#define", "");
duplicate = true;
break;
}
}
if (! duplicate) {
if (argc < maxMacroArgs)
args[argc++] = ppToken->atom;
else
parseContext.error(ppToken->loc, "too many macro parameters", "#define", "");
}
token = scanToken(ppToken);
} while (token == ',');
if (token != ')') {
parseContext.error(ppToken->loc, "missing parenthesis", "#define", "");
return token;
}
mac.argc = argc;
mac.args = (int*)mem_Alloc(pool, argc * sizeof(int));
memcpy(mac.args, args, argc * sizeof(int));
token = scanToken(ppToken);
}
// record the definition of the macro
TSourceLoc defineLoc = ppToken->loc; // because ppToken is going to go to the next line before we report errors
mac.body = new TokenStream;
while (token != '\n') {
RecordToken(mac.body, token, ppToken);
token = scanToken(ppToken);
if (token != '\n' && ppToken->space)
RecordToken(mac.body, ' ', ppToken);
}
// check for duplicate definition
symb = LookUpSymbol(atom);
if (symb) {
if (! symb->mac.undef) {
// Already defined -- need to make sure they are identical:
// "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 (symb->mac.argc != mac.argc)
parseContext.error(defineLoc, "Macro redefined; different number of arguments:", "#define", GetAtomString(atom));
else {
for (int argc = 0; argc < mac.argc; argc++) {
if (symb->mac.args[argc] != mac.args[argc])
parseContext.error(defineLoc, "Macro redefined; different argument names:", "#define", GetAtomString(atom));
}
RewindTokenStream(symb->mac.body);
RewindTokenStream(mac.body);
int newToken;
do {
int oldToken;
TPpToken oldPpToken;
TPpToken newPpToken;
oldToken = ReadToken(symb->mac.body, &oldPpToken);
newToken = ReadToken(mac.body, &newPpToken);
if (oldToken != newToken || oldPpToken != newPpToken) {
parseContext.error(defineLoc, "Macro redefined; different substitutions:", "#define", GetAtomString(atom));
break;
}
} while (newToken > 0);
}
}
} else
symb = AddSymbol(atom);
delete symb->mac.body;
symb->mac = mac;
return '\n';
}
// Handle #undef
int TPpContext::CPPundef(TPpToken* ppToken)
{
int token = scanToken(ppToken);
Symbol *symb;
if (token != CPP_IDENTIFIER) {
parseContext.error(ppToken->loc, "must be followed by macro name", "#undef", "");
return token;
}
const char* name = GetAtomString(ppToken->atom); // TODO preprocessor simplification: the token text should have been built into the ppToken during scanToken()
parseContext.reservedPpErrorCheck(ppToken->loc, name, "#undef");
symb = LookUpSymbol(ppToken->atom);
if (symb) {
symb->mac.undef = 1;
}
token = scanToken(ppToken);
if (token != '\n')
parseContext.error(ppToken->loc, "can only be followed by a single macro name", "#undef", "");
return token;
}
// Handle #else
/* Skip forward to appropriate spot. This is used both
** to skip to a #endif after seeing an #else, AND to skip to a #else,
** #elif, or #endif after a #if/#ifdef/#ifndef/#elif test was false.
*/
int TPpContext::CPPelse(int matchelse, TPpToken* ppToken)
{
int atom;
int depth = 0;
int token = scanToken(ppToken);
while (token != EOF) {
if (token != '#') {
while (token != '\n' && token != EOF)
token = scanToken(ppToken);
if (token == EOF)
return EOF;
token = scanToken(ppToken);
continue;
}
if ((token = scanToken(ppToken)) != CPP_IDENTIFIER)
continue;
atom = ppToken->atom;
if (atom == ifAtom || atom == ifdefAtom || atom == ifndefAtom) {
depth++;
ifdepth++;
elsetracker++;
} else if (atom == endifAtom) {
token = extraTokenCheck(atom, ppToken, scanToken(ppToken));
elseSeen[elsetracker] = false;
--elsetracker;
if (depth == 0) {
// found the #endif we are looking for
if (ifdepth)
--ifdepth;
break;
}
--depth;
--ifdepth;
} else if (matchelse && depth == 0) {
if (atom == elseAtom) {
elseSeen[elsetracker] = true;
token = extraTokenCheck(atom, ppToken, scanToken(ppToken));
// found the #else we are looking for
break;
} else if (atom == elifAtom) {
if (elseSeen[elsetracker])
parseContext.error(ppToken->loc, "#elif after #else", "#elif", "");
/* we decrement ifdepth here, because CPPif will increment
* it and we really want to leave it alone */
if (ifdepth) {
--ifdepth;
elseSeen[elsetracker] = false;
--elsetracker;
}
return CPPif(ppToken);
}
} else if (atom == elseAtom) {
if (elseSeen[elsetracker])
parseContext.error(ppToken->loc, "#else after #else", "#else", "");
else
elseSeen[elsetracker] = true;
token = extraTokenCheck(atom, ppToken, scanToken(ppToken));
} else if (atom == elifAtom) {
if (elseSeen[elsetracker])
parseContext.error(ppToken->loc, "#elif after #else", "#elif", "");
}
}
return token;
}
// Call when there should be no more tokens left on a line.
int TPpContext::extraTokenCheck(int atom, TPpToken* ppToken, int token)
{
if (token != '\n') {
static const char* message = "unexpected tokens following directive";
const char* label;
if (atom == elseAtom)
label = "#else";
else if (atom == elifAtom)
label = "#elif";
else if (atom == endifAtom)
label = "#endif";
else if (atom == ifAtom)
label = "#if";
else if (atom == lineAtom)
label = "#line";
else
label = "";
if (parseContext.messages & EShMsgRelaxedErrors)
parseContext.warn(ppToken->loc, message, label, "");
else
parseContext.error(ppToken->loc, message, label, "");
while (token != '\n')
token = scanToken(ppToken);
}
return token;
}
enum eval_prec {
MIN_PRECEDENCE,
COND, LOGOR, LOGAND, OR, XOR, AND, EQUAL, RELATION, SHIFT, ADD, MUL, UNARY,
MAX_PRECEDENCE
};
namespace {
int op_logor(int a, int b) { return a || b; }
int op_logand(int a, int b) { return a && b; }
int op_or(int a, int b) { return a | b; }
int op_xor(int a, int b) { return a ^ b; }
int op_and(int a, int b) { return a & b; }
int op_eq(int a, int b) { return a == b; }
int op_ne(int a, int b) { return a != b; }
int op_ge(int a, int b) { return a >= b; }
int op_le(int a, int b) { return a <= b; }
int op_gt(int a, int b) { return a > b; }
int op_lt(int a, int b) { return a < b; }
int op_shl(int a, int b) { return a << b; }
int op_shr(int a, int b) { return a >> b; }
int op_add(int a, int b) { return a + b; }
int op_sub(int a, int b) { return a - b; }
int op_mul(int a, int b) { return a * b; }
int op_div(int a, int b) { return a / b; }
int op_mod(int a, int b) { return a % b; }
int op_pos(int a) { return a; }
int op_neg(int a) { return -a; }
int op_cmpl(int a) { return ~a; }
int op_not(int a) { return !a; }
};
struct TBinop {
int token, precedence, (*op)(int, int);
} binop[] = {
{ CPP_OR_OP, LOGOR, op_logor },
{ CPP_AND_OP, LOGAND, op_logand },
{ '|', OR, op_or },
{ '^', XOR, op_xor },
{ '&', AND, op_and },
{ CPP_EQ_OP, EQUAL, op_eq },
{ CPP_NE_OP, EQUAL, op_ne },
{ '>', RELATION, op_gt },
{ CPP_GE_OP, RELATION, op_ge },
{ '<', RELATION, op_lt },
{ CPP_LE_OP, RELATION, op_le },
{ CPP_LEFT_OP, SHIFT, op_shl },
{ CPP_RIGHT_OP, SHIFT, op_shr },
{ '+', ADD, op_add },
{ '-', ADD, op_sub },
{ '*', MUL, op_mul },
{ '/', MUL, op_div },
{ '%', MUL, op_mod },
};
struct TUnop {
int token, (*op)(int);
} unop[] = {
{ '+', op_pos },
{ '-', op_neg },
{ '~', op_cmpl },
{ '!', op_not },
};
#define NUM_ELEMENTS(A) (sizeof(A) / sizeof(A[0]))
int TPpContext::eval(int token, int precedence, bool shortCircuit, int& res, bool& err, TPpToken* ppToken)
{
TSourceLoc loc = ppToken->loc; // because we sometimes read the newline before reporting the error
if (token == CPP_IDENTIFIER) {
if (ppToken->atom == definedAtom) {
bool needclose = 0;
token = scanToken(ppToken);
if (token == '(') {
needclose = true;
token = scanToken(ppToken);
}
if (token != CPP_IDENTIFIER) {
parseContext.error(loc, "incorrect directive, expected identifier", "preprocessor evaluation", "");
err = true;
res = 0;
return token;
}
Symbol* s;
res = (s = LookUpSymbol(ppToken->atom)) ? !s->mac.undef : 0;
token = scanToken(ppToken);
if (needclose) {
if (token != ')') {
parseContext.error(loc, "expected ')'", "preprocessor evaluation", "");
err = true;
res = 0;
return token;
}
token = scanToken(ppToken);
}
} else {
token = evalToToken(token, shortCircuit, res, err, ppToken);
return eval(token, precedence, shortCircuit, res, err, ppToken);
}
} else if (token == CPP_INTCONSTANT) {
res = ppToken->ival;
token = scanToken(ppToken);
} else if (token == '(') {
token = scanToken(ppToken);
token = eval(token, MIN_PRECEDENCE, shortCircuit, res, err, ppToken);
if (! err) {
if (token != ')') {
parseContext.error(loc, "expected ')'", "preprocessor evaluation", "");
err = true;
res = 0;
return token;
}
token = scanToken(ppToken);
}
} else {
int op;
for (op = NUM_ELEMENTS(unop) - 1; op >= 0; op--) {
if (unop[op].token == token)
break;
}
if (op >= 0) {
token = scanToken(ppToken);
token = eval(token, UNARY, shortCircuit, res, err, ppToken);
res = unop[op].op(res);
} else {
parseContext.error(loc, "bad expression", "preprocessor evaluation", "");
err = true;
res = 0;
return token;
}
}
token = evalToToken(token, shortCircuit, res, err, ppToken);
// Perform evaluation of binary operation, if there is one, otherwise we are done.
while (! err) {
if (token == ')' || token == '\n')
break;
int op;
for (op = NUM_ELEMENTS(binop) - 1; op >= 0; op--) {
if (binop[op].token == token)
break;
}
if (op < 0 || binop[op].precedence <= precedence)
break;
int leftSide = res;
// Setup short-circuiting, needed for ES, unless already in a short circuit.
// (Once in a short-circuit, can't turn off again, until that whole subexpression is done.
if (! shortCircuit) {
if ((token == CPP_OR_OP && leftSide == 1) ||
(token == CPP_AND_OP && leftSide == 0))
shortCircuit = true;
}
token = scanToken(ppToken);
token = eval(token, binop[op].precedence, shortCircuit, res, err, ppToken);
res = binop[op].op(leftSide, res);
}
return token;
}
// Expand macros, skipping empty expansions, to get to the first real token in those expansions.
int TPpContext::evalToToken(int token, bool shortCircuit, int& res, bool& err, TPpToken* ppToken)
{
while (token == CPP_IDENTIFIER && ppToken->atom != definedAtom) {
int macroReturn = MacroExpand(ppToken->atom, ppToken, true, false);
if (macroReturn == 0) {
parseContext.error(ppToken->loc, "can't evaluate expression", "preprocessor evaluation", "");
err = true;
res = 0;
token = scanToken(ppToken);
break;
}
if (macroReturn == -1) {
if (! shortCircuit && parseContext.profile == EEsProfile) {
const char* message = "undefined macro in expression not allowed in es profile";
const char* name = GetAtomString(ppToken->atom);
if (parseContext.messages & EShMsgRelaxedErrors)
parseContext.warn(ppToken->loc, message, "preprocessor evaluation", name);
else
parseContext.error(ppToken->loc, message, "preprocessor evaluation", name);
}
}
token = scanToken(ppToken);
}
return token;
}
// Handle #if
int TPpContext::CPPif(TPpToken* ppToken)
{
int token = scanToken(ppToken);
elsetracker++;
if (! ifdepth++)
ifloc = ppToken->loc;
if (ifdepth > maxIfNesting) {
parseContext.error(ppToken->loc, "maximum nesting depth exceeded", "#if", "");
return 0;
}
int res = 0;
bool err = false;
token = eval(token, MIN_PRECEDENCE, false, res, err, ppToken);
token = extraTokenCheck(ifAtom, ppToken, token);
if (!res && !err)
token = CPPelse(1, ppToken);
return token;
}
// Handle #ifdef
int TPpContext::CPPifdef(int defined, TPpToken* ppToken)
{
int token = scanToken(ppToken);
int name = ppToken->atom;
if (++ifdepth > maxIfNesting) {
parseContext.error(ppToken->loc, "maximum nesting depth exceeded", "#ifdef", "");
return 0;
}
elsetracker++;
if (token != CPP_IDENTIFIER) {
if (defined)
parseContext.error(ppToken->loc, "must be followed by macro name", "#ifdef", "");
else
parseContext.error(ppToken->loc, "must be followed by macro name", "#ifndef", "");
} else {
Symbol *s = LookUpSymbol(name);
token = scanToken(ppToken);
if (token != '\n') {
parseContext.error(ppToken->loc, "unexpected tokens following #ifdef directive - expected a newline", "#ifdef", "");
while (token != '\n')
token = scanToken(ppToken);
}
if (((s && !s->mac.undef) ? 1 : 0) != defined)
token = CPPelse(1, ppToken);
}
return token;
}
// Handle #line
int TPpContext::CPPline(TPpToken* ppToken)
{
// "#line must have, after macro substitution, one of the following forms:
// "#line line
// "#line line source-string-number"
int token = scanToken(ppToken);
if (token == '\n') {
parseContext.error(ppToken->loc, "must by followed by an integral literal", "#line", "");
return token;
}
int lineRes = 0;
bool lineErr = false;
token = eval(token, MIN_PRECEDENCE, false, lineRes, lineErr, ppToken);
if (! lineErr) {
if (token == '\n')
++lineRes;
parseContext.setCurrentLine(lineRes);
if (token != '\n') {
int fileRes = 0;
bool fileErr = false;
token = eval(token, MIN_PRECEDENCE, false, fileRes, fileErr, ppToken);
if (! fileErr)
parseContext.setCurrentString(fileRes);
}
}
token = extraTokenCheck(lineAtom, ppToken, token);
return token;
}
// Handle #error
int TPpContext::CPPerror(TPpToken* ppToken)
{
int token = scanToken(ppToken);
std::string message;
TSourceLoc loc = ppToken->loc;
while (token != '\n') {
if (token == CPP_INTCONSTANT || token == CPP_UINTCONSTANT ||
token == CPP_FLOATCONSTANT || token == CPP_DOUBLECONSTANT) {
message.append(ppToken->name);
} else if (token == CPP_IDENTIFIER || token == CPP_STRCONSTANT) {
message.append(GetAtomString(ppToken->atom));
} else {
message.append(GetAtomString(token));
}
message.append(" ");
token = scanToken(ppToken);
}
//store this msg into the shader's information log..set the Compile Error flag!!!!
parseContext.error(loc, message.c_str(), "#error", "");
return '\n';
}
// Handle #pragma
int TPpContext::CPPpragma(TPpToken* ppToken)
{
char SrcStrName[2];
int tokenCount = 0;
int maxTokenCount = 10;
const char* SrcStr;
TVector<TString> tokens;
TSourceLoc loc = ppToken->loc; // because we go to the next line before processing
int token = scanToken(ppToken);
while (token != '\n' && token != EOF) {
switch (token) {
case CPP_IDENTIFIER:
SrcStr = GetAtomString(ppToken->atom);
tokens.push_back(SrcStr);
break;
case CPP_INTCONSTANT:
case CPP_UINTCONSTANT:
case CPP_FLOATCONSTANT:
case CPP_DOUBLECONSTANT:
SrcStr = ppToken->name;
tokens.push_back(SrcStr);
break;
default:
SrcStrName[0] = token;
SrcStrName[1] = '\0';
tokens.push_back(SrcStrName);
}
token = scanToken(ppToken);
}
if (token == EOF)
parseContext.error(loc, "directive must end with a newline", "#pragma", "");
else
parseContext.handlePragma(loc, tokens);
return token;
}
// #version: This is just for error checking: the version and profile are decided before preprocessing starts
int TPpContext::CPPversion(TPpToken* ppToken)
{
int token = scanToken(ppToken);
if (errorOnVersion || versionSeen)
parseContext.error(ppToken->loc, "must occur first in shader", "#version", "");
versionSeen = true;
if (token == '\n') {
parseContext.error(ppToken->loc, "must be followed by version number", "#version", "");
return token;
}
if (token != CPP_INTCONSTANT)
parseContext.error(ppToken->loc, "must be followed by version number", "#version", "");
ppToken->ival = atoi(ppToken->name);
token = scanToken(ppToken);
if (token == '\n')
return token;
else {
if (ppToken->atom != coreAtom &&
ppToken->atom != compatibilityAtom &&
ppToken->atom != esAtom)
parseContext.error(ppToken->loc, "bad profile name; use es, core, or compatibility", "#version", "");
token = scanToken(ppToken);
if (token == '\n')
return token;
else
parseContext.error(ppToken->loc, "bad tokens following profile -- expected newline", "#version", "");
}
return token;
}
// Handle #extension
int TPpContext::CPPextension(TPpToken* ppToken)
{
int token = scanToken(ppToken);
char extensionName[80];
if (token=='\n') {
parseContext.error(ppToken->loc, "extension name not specified", "#extension", "");
return token;
}
if (token != CPP_IDENTIFIER)
parseContext.error(ppToken->loc, "extension name expected", "#extension", "");
strcpy(extensionName, GetAtomString(ppToken->atom));
token = scanToken(ppToken);
if (token != ':') {
parseContext.error(ppToken->loc, "':' missing after extension name", "#extension", "");
return token;
}
token = scanToken(ppToken);
if (token != CPP_IDENTIFIER) {
parseContext.error(ppToken->loc, "behavior for extension not specified", "#extension", "");
return token;
}
parseContext.updateExtensionBehavior(extensionName, GetAtomString(ppToken->atom));
token = scanToken(ppToken);
if (token == '\n')
return token;
else
parseContext.error(ppToken->loc, "extra tokens -- expected newline", "#extension","");
return token;
}
int TPpContext::readCPPline(TPpToken* ppToken)
{
int token = scanToken(ppToken);
bool isVersion = false;
if (token == CPP_IDENTIFIER) {
if (ppToken->atom == defineAtom) {
token = CPPdefine(ppToken);
} else if (ppToken->atom == elseAtom) {
if (elsetracker[elseSeen])
parseContext.error(ppToken->loc, "#else after #else", "#else", "");
elsetracker[elseSeen] = true;
if (! ifdepth)
parseContext.error(ppToken->loc, "mismatched statements", "#else", "");
token = extraTokenCheck(elseAtom, ppToken, scanToken(ppToken));
token = CPPelse(0, ppToken);
} else if (ppToken->atom == elifAtom) {
if (! ifdepth)
parseContext.error(ppToken->loc, "mismatched statements", "#elif", "");
if (elseSeen[elsetracker])
parseContext.error(ppToken->loc, "#elif after #else", "#elif", "");
// this token is really a dont care, but we still need to eat the tokens
token = scanToken(ppToken);
while (token != '\n')
token = scanToken(ppToken);
token = CPPelse(0, ppToken);
} else if (ppToken->atom == endifAtom) {
elseSeen[elsetracker] = false;
--elsetracker;
if (! ifdepth)
parseContext.error(ppToken->loc, "mismatched statements", "#endif", "");
else
--ifdepth;
token = extraTokenCheck(endifAtom, ppToken, scanToken(ppToken));
} else if (ppToken->atom == ifAtom) {
token = CPPif (ppToken);
} else if (ppToken->atom == ifdefAtom) {
token = CPPifdef(1, ppToken);
} else if (ppToken->atom == ifndefAtom) {
token = CPPifdef(0, ppToken);
} else if (ppToken->atom == lineAtom) {
token = CPPline(ppToken);
} else if (ppToken->atom == pragmaAtom) {
token = CPPpragma(ppToken);
} else if (ppToken->atom == undefAtom) {
token = CPPundef(ppToken);
} else if (ppToken->atom == errorAtom) {
token = CPPerror(ppToken);
} else if (ppToken->atom == versionAtom) {
token = CPPversion(ppToken);
isVersion = true;
} else if (ppToken->atom == extensionAtom) {
token = CPPextension(ppToken);
} else {
parseContext.error(ppToken->loc, "invalid directive:", "#", GetAtomString(ppToken->atom));
}
} else if (token != '\n' && token != EOF)
parseContext.error(ppToken->loc, "invalid directive", "#", "");
while (token != '\n' && token != 0 && token != EOF)
token = scanToken(ppToken);
return token;
}
TPpContext::TokenStream* TPpContext::PrescanMacroArg(TokenStream* a, TPpToken* ppToken, bool newLineOkay)
{
int token;
TokenStream *n;
RewindTokenStream(a);
do {
token = ReadToken(a, ppToken);
if (token == CPP_IDENTIFIER && LookUpSymbol(ppToken->atom))
break;
} while (token != tInput::endOfInput);
if (token == tInput::endOfInput)
return a;
n = new TokenStream;
pushInput(new tMarkerInput(this));
pushTokenStreamInput(a, 0);
while ((token = scanToken(ppToken)) != tMarkerInput::marker) {
if (token == CPP_IDENTIFIER && MacroExpand(ppToken->atom, ppToken, false, newLineOkay) != 0)
continue;
RecordToken(n, token, ppToken);
}
popInput();
delete a;
return n;
}
//
// Return the next token for a macro expansion, handling macro args.
//
int TPpContext::tMacroInput::scan(TPpToken* ppToken)
{
int token;
do {
token = pp->ReadToken(mac->body, ppToken);
} while (token == ' '); // handle white space in macro
// TODO: preprocessor: properly handle whitespace (or lack of it) between tokens when expanding
if (token == CPP_IDENTIFIER) {
int i;
for (i = mac->argc - 1; i >= 0; i--)
if (mac->args[i] == ppToken->atom)
break;
if (i >= 0) {
pp->pushTokenStreamInput(args[i], ppToken->atom);
return pp->scanToken(ppToken);
}
}
if (token == endOfInput)
mac->busy = 0;
return token;
}
// return a zero, for scanning a macro that was never defined
int TPpContext::tZeroInput::scan(TPpToken* ppToken)
{
if (done)
return endOfInput;
strcpy(ppToken->name, "0");
ppToken->ival = 0;
ppToken->space = false;
done = true;
return CPP_INTCONSTANT;
}
//
// Check an identifier (atom) to see if it is a macro that should be expanded.
// If it is, and defined, push an tInput that will produce the appropriate expansion
// and return 1.
// If it is, but undefined, and expandUndef is requested, push an tInput that will
// expand to 0 and return -1.
// Otherwise, return 0 to indicate no expansion, which is not necessarily an error.
//
int TPpContext::MacroExpand(int atom, TPpToken* ppToken, bool expandUndef, bool newLineOkay)
{
Symbol *sym = LookUpSymbol(atom);
int token;
int depth = 0;
ppToken->space = false;
if (atom == __LINE__Atom) {
ppToken->ival = parseContext.getCurrentLoc().line;
sprintf(ppToken->name, "%d", ppToken->ival);
UngetToken(CPP_INTCONSTANT, ppToken);
return 1;
}
if (atom == __FILE__Atom) {
ppToken->ival = parseContext.getCurrentLoc().string;
sprintf(ppToken->name, "%d", ppToken->ival);
UngetToken(CPP_INTCONSTANT, ppToken);
return 1;
}
if (atom == __VERSION__Atom) {
ppToken->ival = parseContext.version;
sprintf(ppToken->name, "%d", ppToken->ival);
UngetToken(CPP_INTCONSTANT, ppToken);
return 1;
}
// no recursive expansions
if (sym && sym->mac.busy)
return 0;
// not expanding undefined macros
if ((! sym || sym->mac.undef) && ! expandUndef)
return 0;
// 0 is the value of an undefined macro
if ((! sym || sym->mac.undef) && expandUndef) {
pushInput(new tZeroInput(this));
return -1;
}
tMacroInput *in = new tMacroInput(this);
TSourceLoc loc = ppToken->loc; // in case we go to the next line before discovering the error
in->mac = &sym->mac;
if (sym->mac.args) {
token = scanToken(ppToken);
if (newLineOkay) {
while (token == '\n')
token = scanToken(ppToken);
}
if (token != '(') {
parseContext.error(loc, "expected '(' following", "macro expansion", GetAtomString(atom));
UngetToken(token, ppToken);
ppToken->atom = atom;
delete in;
return 0;
}
in->args.resize(in->mac->argc);
for (int i = 0; i < in->mac->argc; i++)
in->args[i] = new TokenStream;
int arg = 0;
bool tokenRecorded = false;
do {
depth = 0;
while (1) {
token = scanToken(ppToken);
if (token == EOF) {
parseContext.error(loc, "EOF in macro", "macro expansion", GetAtomString(atom));
delete in;
return 0;
}
if (token == '\n') {
if (! newLineOkay) {
parseContext.error(loc, "end of line in macro substitution:", "macro expansion", GetAtomString(atom));
delete in;
return 0;
}
continue;
}
if (token == '#') {
parseContext.error(ppToken->loc, "unexpected '#'", "macro expansion", GetAtomString(atom));
delete in;
return 0;
}
if (in->mac->argc == 0 && token != ')')
break;
if (depth == 0 && (token == ',' || token == ')'))
break;
if (token == '(')
depth++;
if (token == ')')
depth--;
RecordToken(in->args[arg], token, ppToken);
tokenRecorded = true;
}
if (token == ')') {
if (in->mac->argc == 1 && tokenRecorded == 0)
break;
arg++;
break;
}
arg++;
} while (arg < in->mac->argc);
if (arg < in->mac->argc)
parseContext.error(loc, "Too few args in Macro", "macro expansion", GetAtomString(atom));
else if (token != ')') {
depth=0;
while (token != EOF && (depth > 0 || token != ')')) {
if (token == ')')
depth--;
token = scanToken(ppToken);
if (token == '(')
depth++;
}
if (token == EOF) {
parseContext.error(loc, "EOF in macro", "macro expansion", GetAtomString(atom));
delete in;
return 0;
}
parseContext.error(loc, "Too many args in macro", "macro expansion", GetAtomString(atom));
}
for (int i = 0; i < in->mac->argc; i++)
in->args[i] = PrescanMacroArg(in->args[i], ppToken, newLineOkay);
}
pushInput(in);
sym->mac.busy = 1;
RewindTokenStream(sym->mac.body);
return 1;
}
} // end namespace glslang
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