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xkslang
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Merge pull request #1709 from KhronosGroup/fix-pp 

PP: Fix #1605: Paste tokens for ## through number->letter transitions.
This commit is contained in:
John Kessenich 2019-02-23 01:09:17 +07:00 коммит произвёл GitHub
Родитель a51d3d9f22 a84079dcf3
Коммит ec484527b6
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Идентификатор ключа GPG: 4AEE18F83AFDEB23
5 изменённых файлов: 174 добавлений и 62 удалений
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23
Test/baseResults/cppMerge.frag.out Executable file
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@ -0,0 +1,23 @@
cppMerge.frag
Shader version: 450
0:? Sequence
0:22 Function Definition: main( ( global void)
0:22 Function Parameters:
0:? Linker Objects
0:? 'dest1' (layout( set=0 binding=0) writeonly uniform image1D)
0:? 'dest2' (layout( set=0 binding=0) writeonly uniform image1D)
0:? 'dest3' (layout( set=0 binding=0) writeonly uniform image1D)
Linked fragment stage:
Shader version: 450
0:? Sequence
0:22 Function Definition: main( ( global void)
0:22 Function Parameters:
0:? Linker Objects
0:? 'dest1' (layout( set=0 binding=0) writeonly uniform image1D)
0:? 'dest2' (layout( set=0 binding=0) writeonly uniform image1D)
0:? 'dest3' (layout( set=0 binding=0) writeonly uniform image1D)

24
Test/cppMerge.frag Executable file
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@ -0,0 +1,24 @@
#version 450 core
#define PASTER2(type, suffix) type##suffix
#define PASTER3(type, suffix) type## suffix
#define MAKE_TYPE1 image1D dest ## 1;
#define MAKE_TYPE2(type, suffix) PASTER2(type, suffix)
#define MAKE_TYPE3(type, suffix) PASTER3(type, suffix)
#define PREFIX image
#define PREFIX3 imag
#define SUFFIX2 1D
#define SUFFIX3 e1 D
#define RESOURCE_TYPE1 MAKE_TYPE1
#define RESOURCE_TYPE2 MAKE_TYPE2(PREFIX, SUFFIX2)
#define RESOURCE_TYPE3 MAKE_TYPE3(PREFIX3, SUFFIX3)
layout (set = 0, binding = 0) uniform writeonly RESOURCE_TYPE1
layout (set = 0, binding = 0) uniform writeonly RESOURCE_TYPE2 dest2;
layout (set = 0, binding = 0) uniform writeonly RESOURCE_TYPE3 dest3;
void main()
{
}

50
glslang/MachineIndependent/preprocessor/PpContext.h
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@ -84,6 +84,7 @@ NVIDIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <sstream>
#include "../ParseHelper.h"
#include "PpTokens.h"
/* windows only pragma */
#ifdef _MSC_VER
@ -212,7 +213,8 @@ public:
virtual int scan(TPpToken*) = 0;
virtual int getch() = 0;
virtual void ungetch() = 0;
virtual bool peekPasting() { return false; } // true when about to see ##
virtual bool peekPasting() { return false; } // true when about to see ##
virtual bool peekContinuedPasting(int) { return false; } // true when non-spaced tokens can paste
virtual bool endOfReplacementList() { return false; } // true when at the end of a macro replacement list (RHS of #define)
virtual bool isMacroInput() { return false; }
@ -263,7 +265,9 @@ public:
snprintf(ppToken.name, sizeof(ppToken.name), "%s", name.c_str());
return atom;
}
bool isAtom(int a) { return atom == a; }
bool isAtom(int a) const { return atom == a; }
int getAtom() const { return atom; }
bool nonSpaced() const { return !space; }
protected:
Token() {}
int atom;
@ -276,6 +280,35 @@ public:
void putToken(int token, TPpToken* ppToken);
bool peekToken(int atom) { return !atEnd() && stream[currentPos].isAtom(atom); }
bool peekContinuedPasting(int atom)
{
// This is basically necessary because, for example, the PP
// tokenizer only accepts valid numeric-literals plus suffixes, so
// separates numeric-literals plus bad suffix into two tokens, which
// should get both pasted together as one token when token pasting.
//
// The following code is a bit more generalized than the above example.
if (!atEnd() && atom == PpAtomIdentifier && stream[currentPos].nonSpaced()) {
switch(stream[currentPos].getAtom()) {
case PpAtomConstInt:
case PpAtomConstUint:
case PpAtomConstInt64:
case PpAtomConstUint64:
case PpAtomConstInt16:
case PpAtomConstUint16:
case PpAtomConstFloat:
case PpAtomConstDouble:
case PpAtomConstFloat16:
case PpAtomConstString:
case PpAtomIdentifier:
return true;
default:
break;
}
}
return false;
}
int getToken(TParseContextBase&, TPpToken*);
bool atEnd() { return currentPos >= stream.size(); }
bool peekTokenizedPasting(bool lastTokenPastes);
@ -344,6 +377,10 @@ protected:
int getChar() { return inputStack.back()->getch(); }
void ungetChar() { inputStack.back()->ungetch(); }
bool peekPasting() { return !inputStack.empty() && inputStack.back()->peekPasting(); }
bool peekContinuedPasting(int a)
{
return !inputStack.empty() && inputStack.back()->peekContinuedPasting(a);
}
bool endOfReplacementList() { return inputStack.empty() || inputStack.back()->endOfReplacementList(); }
bool isMacroInput() { return inputStack.size() > 0 && inputStack.back()->isMacroInput(); }
@ -368,6 +405,7 @@ protected:
virtual int getch() override { assert(0); return EndOfInput; }
virtual void ungetch() override { assert(0); }
bool peekPasting() override { return prepaste; }
bool peekContinuedPasting(int a) override { return mac->body.peekContinuedPasting(a); }
bool endOfReplacementList() override { return mac->body.atEnd(); }
bool isMacroInput() override { return true; }
@ -442,14 +480,18 @@ protected:
class tTokenInput : public tInput {
public:
tTokenInput(TPpContext* pp, TokenStream* t, bool prepasting) : tInput(pp), tokens(t), lastTokenPastes(prepasting) { }
tTokenInput(TPpContext* pp, TokenStream* t, bool prepasting) :
tInput(pp),
tokens(t),
lastTokenPastes(prepasting) { }
virtual int scan(TPpToken *ppToken) override { return tokens->getToken(pp->parseContext, ppToken); }
virtual int getch() override { assert(0); return EndOfInput; }
virtual void ungetch() override { assert(0); }
virtual bool peekPasting() override { return tokens->peekTokenizedPasting(lastTokenPastes); }
bool peekContinuedPasting(int a) override { return tokens->peekContinuedPasting(a); }
protected:
TokenStream* tokens;
bool lastTokenPastes; // true if the last token in the input is to be pasted, rather than consumed as a token
bool lastTokenPastes; // true if the last token in the input is to be pasted, rather than consumed as a token
};
class tUngotTokenInput : public tInput {

138
glslang/MachineIndependent/preprocessor/PpScanner.cpp
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@ -96,12 +96,19 @@ namespace glslang {
/////////////////////////////////// Floating point constants: /////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////
/*
* lFloatConst() - Scan a single- or double-precision floating point constant. Assumes that the scanner
* has seen at least one digit, followed by either a decimal '.' or the
* letter 'e', or a precision ending (e.g., F or LF).
*/
//
// Scan a single- or double-precision floating point constant.
// Assumes that the scanner has seen at least one digit,
// followed by either a decimal '.' or the letter 'e', or a
// precision ending (e.g., F or LF).
//
// This is technically not correct, as the preprocessor should just
// accept the numeric literal along with whatever suffix it has, but
// currently, it stops on seeing a bad suffix, treating that as the
// next token. This effects things like token pasting, where it is
// relevant how many tokens something was broken into.
//
// See peekContinuedPasting().
int TPpContext::lFloatConst(int len, int ch, TPpToken* ppToken)
{
const auto saveName = [&](int ch) {
@ -435,6 +442,14 @@ int TPpContext::characterLiteral(TPpToken* ppToken)
//
// Scanner used to tokenize source stream.
//
// N.B. Invalid numeric suffixes are not consumed.//
// This is technically not correct, as the preprocessor should just
// accept the numeric literal along with whatever suffix it has, but
// currently, it stops on seeing a bad suffix, treating that as the
// next token. This effects things like token pasting, where it is
// relevant how many tokens something was broken into.
// See peekContinuedPasting().
//
int TPpContext::tStringInput::scan(TPpToken* ppToken)
{
int AlreadyComplained = 0;
@ -1153,62 +1168,69 @@ int TPpContext::tokenPaste(int token, TPpToken& ppToken)
break;
}
// get the token after the ##
token = scanToken(&pastedPpToken);
// Get the token(s) after the ##.
// Because of "space" semantics, and prior tokenization, what
// appeared a single token, e.g. "3A", might have been tokenized
// into two tokens "3" and "A", but the "A" will have 'space' set to
// false. Accumulate all of these to recreate the original lexical
// appearing token.
do {
token = scanToken(&pastedPpToken);
// This covers end of argument expansion
if (token == tMarkerInput::marker) {
parseContext.ppError(ppToken.loc, "unexpected location; end of argument", "##", "");
break;
}
// This covers end of argument expansion
if (token == tMarkerInput::marker) {
parseContext.ppError(ppToken.loc, "unexpected location; end of argument", "##", "");
return resultToken;
}
// get the token text
switch (resultToken) {
case PpAtomIdentifier:
// already have the correct text in token.names
break;
case '=':
case '!':
case '-':
case '~':
case '+':
case '*':
case '/':
case '%':
case '<':
case '>':
case '|':
case '^':
case '&':
case PpAtomRight:
case PpAtomLeft:
case PpAtomAnd:
case PpAtomOr:
case PpAtomXor:
snprintf(ppToken.name, sizeof(ppToken.name), "%s", atomStrings.getString(resultToken));
snprintf(pastedPpToken.name, sizeof(pastedPpToken.name), "%s", atomStrings.getString(token));
break;
default:
parseContext.ppError(ppToken.loc, "not supported for these tokens", "##", "");
return resultToken;
}
// get the token text
switch (resultToken) {
case PpAtomIdentifier:
// already have the correct text in token.names
break;
case '=':
case '!':
case '-':
case '~':
case '+':
case '*':
case '/':
case '%':
case '<':
case '>':
case '|':
case '^':
case '&':
case PpAtomRight:
case PpAtomLeft:
case PpAtomAnd:
case PpAtomOr:
case PpAtomXor:
snprintf(ppToken.name, sizeof(ppToken.name), "%s", atomStrings.getString(resultToken));
snprintf(pastedPpToken.name, sizeof(pastedPpToken.name), "%s", atomStrings.getString(token));
break;
default:
parseContext.ppError(ppToken.loc, "not supported for these tokens", "##", "");
return resultToken;
}
// combine the tokens
if (strlen(ppToken.name) + strlen(pastedPpToken.name) > MaxTokenLength) {
parseContext.ppError(ppToken.loc, "combined tokens are too long", "##", "");
return resultToken;
}
snprintf(&ppToken.name[0] + strlen(ppToken.name), sizeof(ppToken.name) - strlen(ppToken.name),
"%s", pastedPpToken.name);
// combine the tokens
if (strlen(ppToken.name) + strlen(pastedPpToken.name) > MaxTokenLength) {
parseContext.ppError(ppToken.loc, "combined tokens are too long", "##", "");
return resultToken;
}
snprintf(&ppToken.name[0] + strlen(ppToken.name), sizeof(ppToken.name) - strlen(ppToken.name),
"%s", pastedPpToken.name);
// correct the kind of token we are making, if needed (identifiers stay identifiers)
if (resultToken != PpAtomIdentifier) {
int newToken = atomStrings.getAtom(ppToken.name);
if (newToken > 0)
resultToken = newToken;
else
parseContext.ppError(ppToken.loc, "combined token is invalid", "##", "");
}
// correct the kind of token we are making, if needed (identifiers stay identifiers)
if (resultToken != PpAtomIdentifier) {
int newToken = atomStrings.getAtom(ppToken.name);
if (newToken > 0)
resultToken = newToken;
else
parseContext.ppError(ppToken.loc, "combined token is invalid", "##", "");
}
} while (peekContinuedPasting(resultToken));
}
return resultToken;

1
gtests/AST.FromFile.cpp
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@ -93,6 +93,7 @@ INSTANTIATE_TEST_CASE_P(
"cppSimple.vert",
"cppIndent.vert",
"cppIntMinOverNegativeOne.frag",
"cppMerge.frag",
"cppNest.vert",
"cppBad.vert",
"cppBad2.vert",