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parser.cpp
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parser.cpp
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#include <string.h> // strcmp, memcpy
#include "parser.h"
#include "util.h"
namespace glsl {
parser::parser(const char *source, const char *fileName)
: m_lexer(source)
, m_fileName(fileName)
{
m_ast = nullptr;
m_oom = strnew("Out of memory");
m_errorOccured = false;
}
parser::~parser() {
cleanup();
}
#define IS_TYPE(TOKEN, TYPE) \
((TOKEN).m_type == (TYPE))
#define IS_KEYWORD(TOKEN, KEYWORD) \
(IS_TYPE((TOKEN), kType_keyword) && (TOKEN).asKeyword == (KEYWORD))
#define IS_OPERATOR(TOKEN, OPERATOR) \
(IS_TYPE((TOKEN), kType_operator) && (TOKEN).asOperator == (OPERATOR))
#define GC_NEW(X) new(&m_memory)
bool parser::isType(int type) const {
return IS_TYPE(m_token, type);
}
bool parser::isKeyword(int keyword) const {
return IS_KEYWORD(m_token, keyword);
}
bool parser::isOperator(int oper) const {
return IS_OPERATOR(m_token, oper);
}
bool parser::isEndCondition(endCondition condition) const {
return ((condition & kEndConditionSemicolon) && isType(kType_semicolon))
|| ((condition & kEndConditionParanthesis) && isOperator(kOperator_paranthesis_end))
|| ((condition & kEndConditionBracket) && isOperator(kOperator_bracket_end))
|| ((condition & kEndConditionColon) && isOperator(kOperator_colon))
|| ((condition & kEndConditionComma) && isOperator(kOperator_comma));
}
// Constant expression evaluator
bool parser::isConstant(astExpression *expression) const {
if (isConstantValue(expression))
return true;
else if (expression->type == astExpression::kVariableIdentifier) {
astVariable *reference = ((astVariableIdentifier*)expression)->variable;
if (reference->type != astVariable::kGlobal)
return false;
astExpression *initialValue = ((astGlobalVariable*)reference)->initialValue;
if (!initialValue)
return false;
return isConstant(initialValue);
} else if (expression->type == astExpression::kUnaryMinus)
return isConstant(((astUnaryExpression*)expression)->operand);
else if (expression->type == astExpression::kUnaryPlus)
return isConstant(((astUnaryExpression*)expression)->operand);
else if (expression->type == astExpression::kOperation) {
astOperationExpression *operation = (astOperationExpression*)expression;
return isConstant(operation->operand1) && isConstant(operation->operand2);
}
return false;
}
bool parser::isConstantValue(astExpression *expression) const {
return expression->type == astExpression::kIntConstant ||
expression->type == astExpression::kUIntConstant ||
expression->type == astExpression::kFloatConstant ||
expression->type == astExpression::kDoubleConstant ||
expression->type == astExpression::kBoolConstant;
}
#define ICONST(X) ((astIntConstant*)(X))
#define UCONST(X) ((astUIntConstant*)(X))
#define FCONST(X) ((astFloatConstant*)(X))
#define DCONST(X) ((astDoubleConstant*)(X))
#define BCONST(X) ((astBoolConstant*)(X))
#define ICONST_NEW(X) GC_NEW(astConstantExpression) astIntConstant(X)
#define UCONST_NEW(X) GC_NEW(astConstantExpression) astUIntConstant(X)
#define FCONST_NEW(X) GC_NEW(astConstantExpression) astFloatConstant(X)
#define DCONST_NEW(X) GC_NEW(astConstantExpression) astDoubleConstant(X)
#define BCONST_NEW(X) GC_NEW(astConstantExpression) astBoolConstant(X)
#define IVAL(X) (ICONST(X)->value)
#define UVAL(X) (UCONST(X)->value)
#define FVAL(X) (FCONST(X)->value)
#define DVAL(X) (DCONST(X)->value)
#define BVAL(X) (BCONST(X)->value)
astConstantExpression *parser::evaluate(astExpression *expression) {
if (!expression) return 0;
else if (isConstantValue(expression))
return expression;
else if (expression->type == astExpression::kVariableIdentifier)
return evaluate(((astGlobalVariable*)((astVariableIdentifier*)expression)->variable)->initialValue);
else if (expression->type == astExpression::kUnaryMinus) {
astExpression *operand = evaluate(((astUnaryExpression*)expression)->operand);
if (!operand) return 0;
switch (operand->type) {
case astExpression::kIntConstant: return ICONST_NEW(-IVAL(operand));
case astExpression::kFloatConstant: return FCONST_NEW(-FVAL(operand));
case astExpression::kDoubleConstant: return DCONST_NEW(-DVAL(operand));
default:
fatal("invalid operation in constant expression");
return 0;
}
} else if (expression->type == astExpression::kUnaryPlus) {
astExpression *operand = evaluate(((astUnaryExpression*)expression)->operand);
if (!operand) return 0;
switch (operand->type) {
case astExpression::kIntConstant:
case astExpression::kUIntConstant:
case astExpression::kFloatConstant:
case astExpression::kDoubleConstant:
return operand;
default:
fatal("invalid operation in constant expression");
return 0;
}
} else if (expression->type == astExpression::kOperation) {
int operation = ((astOperationExpression*)expression)->operation;
astExpression *lhs = evaluate(((astBinaryExpression*)expression)->operand1);
astExpression *rhs = evaluate(((astBinaryExpression*)expression)->operand2);
if (!lhs) return 0;
if (!rhs) return 0;
switch (lhs->type) {
case astExpression::kIntConstant:
switch (operation) {
case kOperator_multiply: return ICONST_NEW(IVAL(lhs) * IVAL(rhs));
case kOperator_divide: return ICONST_NEW(IVAL(lhs) / IVAL(rhs));
case kOperator_modulus: return ICONST_NEW(IVAL(lhs) % IVAL(rhs));
case kOperator_plus: return ICONST_NEW(IVAL(lhs) + IVAL(rhs));
case kOperator_minus: return ICONST_NEW(IVAL(lhs) - IVAL(rhs));
case kOperator_shift_left: return ICONST_NEW(IVAL(lhs) << IVAL(rhs));
case kOperator_shift_right: return ICONST_NEW(IVAL(lhs) >> IVAL(rhs));
case kOperator_less: return BCONST_NEW(IVAL(lhs) < IVAL(rhs));
case kOperator_greater: return BCONST_NEW(IVAL(lhs) > IVAL(rhs));
case kOperator_less_equal: return BCONST_NEW(IVAL(lhs) <= IVAL(rhs));
case kOperator_greater_equal: return BCONST_NEW(IVAL(lhs) >= IVAL(rhs));
case kOperator_equal: return BCONST_NEW(IVAL(lhs) == IVAL(rhs));
case kOperator_not_equal: return BCONST_NEW(IVAL(lhs) != IVAL(rhs));
case kOperator_bit_and: return ICONST_NEW(IVAL(lhs) & IVAL(rhs));
case kOperator_bit_xor: return ICONST_NEW(IVAL(lhs) ^ IVAL(rhs));
case kOperator_logical_and: return BCONST_NEW(IVAL(lhs) && IVAL(rhs));
case kOperator_logical_xor: return BCONST_NEW(!IVAL(lhs) != !IVAL(rhs));
case kOperator_logical_or: return BCONST_NEW(IVAL(lhs) || IVAL(rhs));
default:
fatal("invalid operation in constant expression");
return 0;
}
break;
case astExpression::kUIntConstant:
switch (operation) {
case kOperator_multiply: return UCONST_NEW(UVAL(lhs) * UVAL(rhs));
case kOperator_divide: return UCONST_NEW(UVAL(lhs) / UVAL(rhs));
case kOperator_modulus: return UCONST_NEW(UVAL(lhs) % UVAL(rhs));
case kOperator_plus: return UCONST_NEW(UVAL(lhs) + UVAL(rhs));
case kOperator_minus: return UCONST_NEW(UVAL(lhs) - UVAL(rhs));
case kOperator_shift_left: return UCONST_NEW(UVAL(lhs) << UVAL(rhs));
case kOperator_shift_right: return UCONST_NEW(UVAL(lhs) >> UVAL(rhs));
case kOperator_less: return BCONST_NEW(UVAL(lhs) < UVAL(rhs));
case kOperator_greater: return BCONST_NEW(UVAL(lhs) > UVAL(rhs));
case kOperator_less_equal: return BCONST_NEW(UVAL(lhs) <= UVAL(rhs));
case kOperator_greater_equal: return BCONST_NEW(UVAL(lhs) >= UVAL(rhs));
case kOperator_equal: return BCONST_NEW(UVAL(lhs) == UVAL(rhs));
case kOperator_not_equal: return BCONST_NEW(UVAL(lhs) != UVAL(rhs));
case kOperator_bit_and: return UCONST_NEW(UVAL(lhs) & UVAL(rhs));
case kOperator_bit_xor: return UCONST_NEW(UVAL(lhs) ^ UVAL(rhs));
case kOperator_logical_and: return BCONST_NEW(UVAL(lhs) && UVAL(rhs));
case kOperator_logical_xor: return BCONST_NEW(!UVAL(lhs) != !UVAL(rhs));
case kOperator_logical_or: return BCONST_NEW(UVAL(lhs) || UVAL(rhs));
default:
fatal("invalid operation in constant expression");
return 0;
}
break;
case astExpression::kFloatConstant:
switch (operation) {
case kOperator_multiply: return FCONST_NEW(FVAL(lhs) * FVAL(rhs));
case kOperator_divide: return FCONST_NEW(FVAL(lhs) / FVAL(rhs));
case kOperator_plus: return FCONST_NEW(FVAL(lhs) + FVAL(rhs));
case kOperator_minus: return FCONST_NEW(FVAL(lhs) - FVAL(rhs));
case kOperator_less: return BCONST_NEW(FVAL(lhs) < FVAL(rhs));
case kOperator_greater: return BCONST_NEW(FVAL(lhs) > FVAL(rhs));
case kOperator_less_equal: return BCONST_NEW(FVAL(lhs) <= FVAL(rhs));
case kOperator_greater_equal: return BCONST_NEW(FVAL(lhs) >= FVAL(rhs));
case kOperator_equal: return BCONST_NEW(FVAL(lhs) == FVAL(rhs));
case kOperator_not_equal: return BCONST_NEW(FVAL(lhs) != FVAL(rhs));
case kOperator_logical_and: return BCONST_NEW(FVAL(lhs) && FVAL(rhs));
case kOperator_logical_xor: return BCONST_NEW(!FVAL(lhs) != !FVAL(rhs));
case kOperator_logical_or: return BCONST_NEW(FVAL(lhs) || FVAL(rhs));
default:
fatal("invalid operation in constant expression");
return 0;
}
break;
case astExpression::kDoubleConstant:
switch (operation) {
case kOperator_multiply: return DCONST_NEW(DVAL(lhs) * DVAL(rhs));
case kOperator_divide: return DCONST_NEW(DVAL(lhs) / DVAL(rhs));
case kOperator_plus: return DCONST_NEW(DVAL(lhs) + DVAL(rhs));
case kOperator_minus: return DCONST_NEW(DVAL(lhs) - DVAL(rhs));
case kOperator_less: return BCONST_NEW(DVAL(lhs) < DVAL(rhs));
case kOperator_greater: return BCONST_NEW(DVAL(lhs) > DVAL(rhs));
case kOperator_less_equal: return BCONST_NEW(DVAL(lhs) <= DVAL(rhs));
case kOperator_greater_equal: return BCONST_NEW(DVAL(lhs) >= DVAL(rhs));
case kOperator_equal: return BCONST_NEW(DVAL(lhs) == DVAL(rhs));
case kOperator_not_equal: return BCONST_NEW(DVAL(lhs) != DVAL(rhs));
case kOperator_logical_and: return BCONST_NEW(DVAL(lhs) && DVAL(rhs));
case kOperator_logical_xor: return BCONST_NEW(!DVAL(lhs) != !DVAL(rhs));
case kOperator_logical_or: return BCONST_NEW(DVAL(lhs) || DVAL(rhs));
default:
fatal("invalid operation in constant expression");
return 0;
}
break;
case astExpression::kBoolConstant:
switch (operation) {
case kOperator_equal: return BCONST_NEW(BVAL(lhs) == BVAL(rhs));
case kOperator_not_equal: return BCONST_NEW(BVAL(lhs) != BVAL(rhs));
case kOperator_logical_and: return BCONST_NEW(BVAL(lhs) && BVAL(rhs));
case kOperator_logical_xor: return BCONST_NEW(!BVAL(lhs) != !BVAL(rhs));
case kOperator_logical_or: return BCONST_NEW(BVAL(lhs) || BVAL(rhs));
default:
fatal("invalid operation in constant expression");
return 0;
}
break;
}
} else {
return evaluate(expression);
}
return 0;
}
void parser::fatal(const char *fmt, ...) {
// Format banner
char *banner = 0;
int bannerLength = allocfmt(&banner, "%s:%zu:%zu: error: ", m_fileName, m_lexer.line(), m_lexer.column());
if (bannerLength == -1) {
m_error = m_oom;
return;
}
// Format message
char *message = 0;
va_list va;
va_start(va, fmt);
int messageLength = allocvfmt(&message, fmt, va);
if (messageLength == -1) {
va_end(va);
m_error = m_oom;
return;
}
va_end(va);
// Concatenate the two things
char *concat = (char *)malloc(bannerLength + messageLength + 1);
if (!concat) {
free(banner);
free(message);
m_error = m_oom;
return;
}
memcpy(concat, banner, bannerLength);
memcpy(concat + bannerLength, message, messageLength + 1); // +1 for '\0'
free(banner);
free(message);
m_error = concat;
m_strings.push_back(m_error);
m_errorOccured = true;
}
#undef TYPENAME
#define TYPENAME(X) case kKeyword_##X:
bool parser::isBuiltin() const {
if (!isType(kType_keyword))
return false;
switch (m_token.asKeyword) {
#include "lexemes.h"
return true;
default:
break;
}
return false;
}
#undef TYPENAME
#define TYPENAME(...)
void parser::cleanup()
{
if (m_ast != nullptr)
delete m_ast;
for (size_t i = 0; i < m_strings.size(); i++)
free(m_strings[i]);
for (size_t i = 0; i < m_memory.size(); i++)
m_memory[i].destroy();
m_strings.clear();
m_memory.clear();
m_scopes.clear();
}
void parser::addGlobal(const char* name, int type, const char* typeName)
{
astGlobalVariable* global = GC_NEW(astVariable) astGlobalVariable();
global->storage = kOut;
global->auxiliary = kCentroid;
global->memory = kReadOnly | kWriteOnly; // random values
global->precision = kHighp;
global->interpolation = kSmooth;
global->initialValue = nullptr;
if (type != kKeyword_struct)
global->baseType = GC_NEW(astType) astBuiltin(type);
else {
astStruct* str = GC_NEW(astType) astStruct();
str->name = strnew(typeName);
m_ast->structures.push_back(str);
global->baseType = str;
}
global->name = strnew(name);
global->isInvariant = false;
global->isPrecise = false;
global->layoutQualifiers.clear();
global->isArray = false;
global->arraySizes.clear();
m_toAddGlobal.push_back(global);
}
void parser::m_addBuiltinVariables()
{
// vertex inputs
addGlobal("gl_VertexID", kKeyword_int);
addGlobal("gl_InstanceID", kKeyword_int);
addGlobal("gl_DrawID", kKeyword_int);
addGlobal("gl_BaseVertex", kKeyword_int);
addGlobal("gl_BaseInstance", kKeyword_int);
// vertex outputs
addGlobal("gl_Position", kKeyword_vec4);
addGlobal("gl_PointSize", kKeyword_float);
// fragment inputs
addGlobal("gl_FragCoord", kKeyword_vec4);
addGlobal("gl_FrontFacing", kKeyword_bool);
addGlobal("gl_PointCoord", kKeyword_vec2);
// fragment outputs
addGlobal("gl_FragDepth", kKeyword_float);
}
// 0 -> error, 1 -> nothing parsed, 2 -> all ok
int parser::preprocess()
{
// #line
if (isType(kType_hash)) {
if (!next())
return 0;
char* idName = m_token.asIdentifier;
// #line <nr>
if (strcmp(idName, "line") == 0) {
if (!next())
return 0;
if (isType(kType_constant_int))
debug::inst().setLine(m_token.asInt-1); // -1 since we will increase after the \n
}
return 2;
}
return 1;
}
/// The parser entry point
CHECK_RETURN astTU *parser::parse(int type, bool ignoreUndefinedVariables) {
m_errorOccured = false;
if (!ignoreUndefinedVariables)
cleanup();
m_ast = new astTU(type);
m_scopes.push_back(scope());
debug::inst().setLine(1);
m_addBuiltinVariables();
for (int i = 0; i < m_toAddGlobal.size(); i++)
m_scopes.back().push_back(m_toAddGlobal[i]);
m_toAddGlobal.clear();
for (;;) {
m_lexer.read(m_token, true);
if (m_lexer.error()) {
fatal("%s", m_lexer.error());
return 0;
}
if (isType(kType_eof))
break;
int ppRes = preprocess();
if (ppRes == 0)
return 0;
else if (ppRes == 2) {
if (!next())
return 0;
}
vector<topLevel> items;
if (!parseTopLevel(items))
return 0;
if (isType(kType_semicolon)) {
for (size_t i = 0; i < items.size(); i++) {
topLevel &parse = items[i];
astGlobalVariable *global = GC_NEW(astVariable) astGlobalVariable();
global->storage = parse.storage;
global->auxiliary = parse.auxiliary;
global->memory = parse.memory;
global->precision = parse.precision;
global->interpolation = parse.interpolation;
global->baseType = parse.type;
global->name = strnew(parse.name);
global->isInvariant = parse.isInvariant;
global->isPrecise = parse.isPrecise;
global->layoutQualifiers = parse.layoutQualifiers;
if (parse.initialValue) {
if (!(global->initialValue = evaluate(parse.initialValue)))
return 0;
}
global->isArray = parse.isArray;
global->arraySizes = parse.arraySizes;
m_ast->globals.push_back(global);
m_scopes.back().push_back(global);
}
}
else if (isOperator(kOperator_paranthesis_begin)) {
astFunction *function = parseFunction(items.front());
if (!function)
return 0;
m_ast->functions.push_back(function);
}
else if (isType(kType_whitespace)) {
continue; // whitespace tokens will be used later for the preprocessor
}
else {
fatal("syntax error at top level %d", m_token.asKeyword);
return 0;
}
}
return m_ast;
}
CHECK_RETURN bool parser::parseStorage(topLevel ¤t) {
// const, in, out, attribute, uniform, varying, buffer, shared
if (isKeyword(kKeyword_const)) {
current.storage = kConst;
if (!next()) return false; // skip 'const'
} else if (isKeyword(kKeyword_in)) {
current.storage = kIn;
if (!next()) return false; // skip 'in'
} else if (isKeyword(kKeyword_out)) {
current.storage = kOut;
if (!next()) return false; // skip 'out'
} else if (isKeyword(kKeyword_attribute)) {
current.storage = kAttribute;
if (!next()) return false; // skip 'attribute'
} else if (isKeyword(kKeyword_uniform)) {
current.storage = kUniform;
if (!next()) return false; // skip 'uniform'
} else if (isKeyword(kKeyword_varying)) {
current.storage = kVarying;
if (!next()) return false; // skip 'varying'
} else if (isKeyword(kKeyword_buffer)) {
current.storage = kBuffer;
if (!next()) return false; // skip 'buffer'
} else if (isKeyword(kKeyword_shared)) {
current.storage = kShared;
if (!next()) return false; // skip 'shared'
}
return true;
}
CHECK_RETURN bool parser::parseAuxiliary(topLevel ¤t) {
// centroid, sample, patch
if (isKeyword(kKeyword_centroid)) {
current.auxiliary = kCentroid;
if (!next()) return false; // skip 'centroid'
} else if (isKeyword(kKeyword_sample)) {
current.auxiliary = kSample;
if (!next()) return false; // skip 'sample'
} else if (isKeyword(kKeyword_patch)) {
current.auxiliary = kPatch;
if (!next()) return false; // skip 'patch'
}
return true;
}
CHECK_RETURN bool parser::parseInterpolation(topLevel ¤t) {
// smooth, flat, noperspective
if (isKeyword(kKeyword_smooth)) {
current.interpolation = kSmooth;
if (!next()) return false; // skip 'smooth'
} else if (isKeyword(kKeyword_flat)) {
current.interpolation = kFlat;
if (!next()) return false; // skip 'flat'
} else if (isKeyword(kKeyword_noperspective)) {
current.interpolation = kNoPerspective;
if (!next()) return false; // skip 'noperspective'
}
return true;
}
CHECK_RETURN bool parser::parsePrecision(topLevel ¤t) {
// highp, mediump, lowp
if (isKeyword(kKeyword_highp)) {
current.precision = kHighp;
if (!next()) return false; // skip 'highp'
} else if (isKeyword(kKeyword_mediump)) {
current.precision = kMediump;
if (!next()) return false; // skip 'mediump'
} else if (isKeyword(kKeyword_lowp)) {
current.precision = kLowp;
if (!next()) return false; // skip 'lowp'
}
return true;
}
CHECK_RETURN bool parser::parseInvariant(topLevel ¤t) {
// invariant
if (isKeyword(kKeyword_invariant)) {
current.isInvariant = true;
if (!next()) return false; // skip 'invariant'
}
return true;
}
CHECK_RETURN bool parser::parsePrecise(topLevel ¤t) {
// precise
if (isKeyword(kKeyword_precise)) {
current.isPrecise = true;
if (!next()) return false; // skip 'precise'
}
return true;
}
CHECK_RETURN bool parser::parseMemory(topLevel ¤t) {
// coherent, volatile, restrict, readonly, writeonly
if (isKeyword(kKeyword_coherent)) {
current.memory |= kCoherent;
if (!next()) return false; // skip 'coherent'
} else if (isKeyword(kKeyword_volatile)) {
current.memory |= kVolatile;
if (!next()) return false; // skip 'volatile'
} else if (isKeyword(kKeyword_restrict)) {
current.memory |= kRestrict;
if (!next()) return false; // skip 'restrict'
} else if (isKeyword(kKeyword_readonly)) {
current.memory |= kReadOnly;
if (!next()) return false; // skip 'readonly'
} else if (isKeyword(kKeyword_writeonly)) {
current.memory |= kWriteOnly;
if (!next()) return false; // skip 'writeonly;
}
return true;
}
static struct {
const char *qualifier;
bool isAssign;
} kLayoutQualifiers[] = {
{ "shared", false },
{ "packed", false },
{ "std140", false },
{ "row_major", false },
{ "column_major", false },
{ "binding", true },
{ "offset", true },
{ "align", true },
{ "location", true },
{ "component", true },
{ "index", true },
{ "triangles", false },
{ "quads", false },
{ "isolines", false },
{ "equal_spacing", false },
{ "fractional_even_spacing", false },
{ "fractional_odd_spacing", false },
{ "cw", false },
{ "ccw", false },
{ "point_mode", false },
{ "points", false },
{ "lines", false },
{ "lines_adjacency", false },
{ "triangles_adjacency", false },
{ "invocations", true },
{ "origin_upper_left", false },
{ "pixel_center_integer", false },
{ "early_fragment_tests", false },
{ "local_size_x", true },
{ "local_size_y", true },
{ "local_size_z", true },
{ "xfb_buffer", true },
{ "xfb_stride", true },
{ "xfb_offset", true },
{ "vertices", true },
{ "line_strip", false },
{ "triangle_strip", false },
{ "max_vertices", true },
{ "stream", true },
{ "depth_any", false },
{ "depth_greater", false },
{ "depth_less", false },
{ "depth_unchanged", false }
};
CHECK_RETURN bool parser::parseLayout(topLevel ¤t) {
vector<astLayoutQualifier*> &qualifiers = current.layoutQualifiers;
if (isKeyword(kKeyword_layout)) {
if (!next()) // skip 'layout'
return false;
if (!isOperator(kOperator_paranthesis_begin)) {
fatal("expected `(' after `layout'");
return false;
}
if (!next()) // skip '('
return false;
while (!isOperator(kOperator_paranthesis_end)) {
astLayoutQualifier *qualifier = GC_NEW(astLayoutQualifier) astLayoutQualifier();
// "The tokens used for layout-qualifier-name are identifiers,
// not keywords, however, the shared keyword is allowed as a
// layout-qualifier-id."
if (!isType(kType_identifier) && !isKeyword(kKeyword_shared))
return false;
int found = -1;
qualifier->name = strnew(isType(kType_identifier) ? m_token.asIdentifier : "shared");
for (size_t i = 0; i < sizeof(kLayoutQualifiers)/sizeof(kLayoutQualifiers[0]); i++) {
if (strcmp(qualifier->name, kLayoutQualifiers[i].qualifier))
continue;
found = int(i);
break;
}
if (found == -1) {
fatal("unknown layout qualifier `%s'", qualifier->name);
return false;
}
if (!next()) // skip identifier or 'shared' keyword
return false;
if (isOperator(kOperator_assign)) {
if (!kLayoutQualifiers[found].isAssign) {
fatal("unexpected layout qualifier value on `%s' layout qualifier", qualifier->name);
return false;
}
if (!next()) // skip '='
return false;
if (!(qualifier->initialValue = parseExpression(kEndConditionComma | kEndConditionParanthesis)))
return false;
if (!isConstant(qualifier->initialValue)) {
// TODO: check integer-constant-expression
fatal("value for layout qualifier `%s' is not a valid constant expression",
qualifier->name);
return false;
}
if (!(qualifier->initialValue = evaluate(qualifier->initialValue)))
return false;
} else if (kLayoutQualifiers[found].isAssign) {
fatal("expected layout qualifier value for `%s' layout qualifier", qualifier->name);
return false;
}
if (isOperator(kOperator_comma)) {
if (!next()) // skip ','
return false;
}
qualifiers.push_back(qualifier);
}
if (!next()) // skip ')'
return false;
}
return true;
}
CHECK_RETURN bool parser::parseTopLevelItem(topLevel &level, topLevel *continuation) {
vector<topLevel> items;
while (!isBuiltin() && !isType(kType_identifier)) {
// If this is an empty file don't get caught in this loop indefinitely
token peek = m_lexer.peek();
if (IS_TYPE(peek, kType_eof))
return false;
topLevel next;
if (continuation)
next = *continuation;
if (!parseStorage(next)) return false;
if (!parseAuxiliary(next)) return false;
if (!parseInterpolation(next)) return false;
if (!parsePrecision(next)) return false;
if (!parseInvariant(next)) return false;
if (!parsePrecise(next)) return false;
if (!parseMemory(next)) return false;
if (!parseLayout(next)) return false;
if (isKeyword(kKeyword_struct)) {
astStruct *unique = parseStruct();
if (!unique)
return false;
m_ast->structures.push_back(unique);
if (isType(kType_semicolon))
{
return true;
} else {
level.type = unique;
}
} else {
items.push_back(next);
}
}
if (continuation) {
level = *continuation;
// erase anything that is not an array size on the type, e.g
// int[2] a[2], b; should produce: int a[2][2]; int b[2];
level.arraySizes.erase(level.arraySizes.begin() + level.arrayOnTypeOffset, level.arraySizes.end());
}
for (size_t i = 0; i < items.size(); i++) {
topLevel &next = items[i];
const int storage = level.storage != -1 ? level.storage : next.storage;
if (m_ast->type == astTU::kVertex && storage == kIn) {
// "It's a compile-time error to use any auxiliary or interpolation
// qualifiers on a vertex shader input"
if (level.auxiliary != -1 || next.auxiliary != -1) {
fatal("cannot use auxiliary storage qualifier on vertex shader input");
return false;
} else if (level.interpolation != -1 || next.interpolation != -1) {
fatal("cannot use interpolation qualifier on vertex shader input");
return false;
}
}
if (m_ast->type == astTU::kFragment && storage == kOut) {
// "It's a compile-time error to use auxiliary storage qualifiers or
// interpolation qualifiers on an output in a fragment shader."
if (level.auxiliary != -1 || next.auxiliary != -1) {
fatal("cannot use auxiliary storage qualifier on fragment shader output");
return false;
} else if (level.interpolation != -1 || next.interpolation != -1) {
fatal("cannot use interpolation qualifier on fragment shader output");
return false;
}
}
if (m_ast->type != astTU::kTessEvaluation && storage == kIn) {
// "Applying the patch qualifier to inputs can only be done in tessellation
// evaluation shaders. It is a compile-time error to use patch with inputs
// in any other stage."
if (level.auxiliary == kPatch || next.auxiliary == kPatch) {
fatal("applying `patch' qualifier to input can only be done in tessellation evaluation shaders");
return false;
}
}
if (m_ast->type != astTU::kTessControl && storage == kOut) {
// "Applying patch to an output can only be done in a tessellation control
// shader. It is a compile-time errot to use patch on outputs in any
// other stage."
if (level.auxiliary == kPatch || next.auxiliary == kPatch) {
fatal("applying `patch' qualifier to output can only be done in tessellation control shaders");
return false;
}
}
if (next.storage != -1 && level.storage != -1) {
fatal("multiple storage qualifiers in declaration");
return false;
} else if (next.auxiliary != -1 && level.auxiliary != -1) {
fatal("multiple auxiliary storage qualifiers in declaration");
return false;
} else if (next.interpolation != -1 && level.interpolation != -1) {
fatal("multiple interpolation qualifiers in declaration");
return false;
} if (next.precision != -1 && level.precision != -1) {
fatal("multiple precision qualifiers in declaration");
return false;
}
level.storage = next.storage;
level.auxiliary = next.auxiliary;
level.interpolation = next.interpolation;
level.precision = next.precision;
level.memory |= next.memory;
for (size_t i = 0; i < next.layoutQualifiers.size(); i++) {
// "When the same layout-qualifier-name occurs multiple times, in a single declaration, the
// last occurrence overrides the former occurrence(s)"
for (size_t j = 0; i < level.layoutQualifiers.size(); j++) {
if (next.layoutQualifiers[i]->name == level.layoutQualifiers[j]->name)
level.layoutQualifiers.erase(level.layoutQualifiers.begin() + j);
}
level.layoutQualifiers.push_back(next.layoutQualifiers[i]);
}
}
// "It's a compile-time error to use interpolation qualifiers with patch"
if (level.auxiliary == kPatch && level.interpolation != -1) {
fatal("cannot use interpolation qualifier with auxiliary storage qualifier `patch'");
return false;
}
if (!continuation && !level.type) {
if (isType(kType_identifier)) {
level.type = findType(m_token.asIdentifier);
if (!next()) // skip identifier
return false;
} else {
level.type = parseBuiltin();
if (!next()) // skip typename
return false;
}
if (level.type) {
// Could be an array
while (isOperator(kOperator_bracket_begin)) {
level.isArray = true;
astConstantExpression *arraySize = parseArraySize();
if (!arraySize)
return false;
level.arraySizes.insert(level.arraySizes.begin(), arraySize);
level.arrayOnTypeOffset++;
if (!next()) // skip ']'
return false;
}
}
}
if (!level.type) {
fatal("expected typename");
return false;
}
if (isType(kType_identifier)) {
level.name = strnew(m_token.asIdentifier);
if (!next())// skip identifier
return false;
}
while (isOperator(kOperator_bracket_begin)) {
level.isArray = true;
level.arraySizes.push_back(parseArraySize());
if (!next()) // skip ']'
return false;
}
// Can have a constant expression assignment
if (isOperator(kOperator_assign)) {
if (!next()) // skip '='
return false;
if (!(level.initialValue = parseExpression(kEndConditionSemicolon)))
return false;
if (!isConstant(level.initialValue)) {
fatal("not a valid constant expression");
return false;
}
}
// If it isn't a function or prototype than the use of void is not legal
if (!isOperator(kOperator_paranthesis_begin)) {
if (level.type->builtin && ((astBuiltin*)level.type)->type == kKeyword_void) {
fatal("`void' cannot be used in declaration");
return false;
}
}
// if it doesn't have a name than it's illegal
if (strnil(level.name)) {
fatal("expected name for declaration");
return false;
}
return true;
}
CHECK_RETURN bool parser::parseTopLevel(vector<topLevel> &items) {
topLevel item;
if (!parseTopLevelItem(item))
return false;
if (item.type)
items.push_back(item);
while (items.size() && isOperator(kOperator_comma)) {
if (!next())
return false; // skip ','
topLevel nextItem;
if (!parseTopLevelItem(nextItem, &items.front()))
return false;
if (nextItem.type)
items.push_back(nextItem);
}
return true;
}
CHECK_RETURN astStruct *parser::parseStruct() {
if (!next()) return 0; // skip struct
astStruct *unique = GC_NEW(astType) astStruct;
if (isType(kType_identifier)) {
unique->name = strnew(m_token.asIdentifier);
if (!next()) return 0; // skip identifier
}
if (!isType(kType_scope_begin)) {
fatal("expected '{' for structure definition");
return 0;
}
if (!next()) return 0; // skip '{'
vector<topLevel> items;
while (!isType(kType_scope_end)) {
if (!parseTopLevel(items))
return 0;
if (!next())
return 0;
}
for (size_t i = 0; i < items.size(); i++) {
topLevel &parse = items[i];
astVariable *field = GC_NEW(astVariable) astVariable(astVariable::kField);
field->baseType = parse.type;
field->name = strnew(parse.name);
field->isPrecise = parse.isPrecise;
field->isArray = parse.isArray;
field->arraySizes = parse.arraySizes;
unique->fields.push_back(field);
}
if (!next()) return 0; // skip '}'
return unique;
}
CHECK_RETURN astExpression *parser::parseBinary(int lhsPrecedence, astExpression *lhs, endCondition end) {
// Precedence climbing
while (!isEndCondition(end)) {
int binaryPrecedence = m_token.precedence();
if (binaryPrecedence < lhsPrecedence)
break;
astBinaryExpression *expression = createExpression();
if (!next())
return 0;
astExpression *rhs = parseUnary(end);
if (!rhs)
return 0;
if (!next())
return 0;
if (((astExpression*)expression)->type == astExpression::kAssign) {
astExpression *find = lhs;
while (find->type == astExpression::kArraySubscript
|| find->type == astExpression::kFieldOrSwizzle)
{
find = (find->type == astExpression::kArraySubscript)
? ((astArraySubscript*)find)->operand
: ((astFieldOrSwizzle*)find)->operand;
}
if (find->type != astExpression::kVariableIdentifier) {
fatal("not a valid lvalue");
return 0;
}
astVariable *variable = ((astVariableIdentifier*)lhs)->variable;
if (variable->type == astVariable::kGlobal) {
astGlobalVariable *global = (astGlobalVariable*)variable;
// "It's a compile-time error to write to a variable declared as an input"