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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- PPExpressions.cpp - Preprocessor Expression Evaluation -----------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the Preprocessor::EvaluateDirectiveExpression method,
11// which parses and evaluates integer constant expressions for #if directives.
12//
13//===----------------------------------------------------------------------===//
14//
15// FIXME: implement testing for #assert's.
16//
17//===----------------------------------------------------------------------===//
18
19#include "clang/Lex/Preprocessor.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000020#include "clang/Basic/TargetInfo.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000021#include "clang/Lex/CodeCompletionHandler.h"
Chris Lattner500d3292009-01-29 05:15:15 +000022#include "clang/Lex/LexDiagnostic.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000023#include "clang/Lex/LiteralSupport.h"
24#include "clang/Lex/MacroInfo.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000025#include "llvm/ADT/APSInt.h"
David Blaikie9fe8c742011-09-23 05:35:21 +000026#include "llvm/Support/ErrorHandling.h"
David Blaikieabc0bea2013-03-18 23:22:28 +000027#include "llvm/Support/SaveAndRestore.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000028using namespace clang;
29
Dan Gohman3c46e8d2010-07-26 21:25:24 +000030namespace {
31
Chris Lattner8ed30442008-05-05 06:45:50 +000032/// PPValue - Represents the value of a subexpression of a preprocessor
33/// conditional and the source range covered by it.
34class PPValue {
35 SourceRange Range;
36public:
37 llvm::APSInt Val;
Mike Stump1eb44332009-09-09 15:08:12 +000038
Chris Lattner8ed30442008-05-05 06:45:50 +000039 // Default ctor - Construct an 'invalid' PPValue.
40 PPValue(unsigned BitWidth) : Val(BitWidth) {}
Mike Stump1eb44332009-09-09 15:08:12 +000041
Chris Lattner8ed30442008-05-05 06:45:50 +000042 unsigned getBitWidth() const { return Val.getBitWidth(); }
43 bool isUnsigned() const { return Val.isUnsigned(); }
Mike Stump1eb44332009-09-09 15:08:12 +000044
Chris Lattner8ed30442008-05-05 06:45:50 +000045 const SourceRange &getRange() const { return Range; }
Mike Stump1eb44332009-09-09 15:08:12 +000046
Chris Lattner8ed30442008-05-05 06:45:50 +000047 void setRange(SourceLocation L) { Range.setBegin(L); Range.setEnd(L); }
48 void setRange(SourceLocation B, SourceLocation E) {
Mike Stump1eb44332009-09-09 15:08:12 +000049 Range.setBegin(B); Range.setEnd(E);
Chris Lattner8ed30442008-05-05 06:45:50 +000050 }
51 void setBegin(SourceLocation L) { Range.setBegin(L); }
52 void setEnd(SourceLocation L) { Range.setEnd(L); }
53};
54
Dan Gohman3c46e8d2010-07-26 21:25:24 +000055}
56
Chris Lattner8ed30442008-05-05 06:45:50 +000057static bool EvaluateDirectiveSubExpr(PPValue &LHS, unsigned MinPrec,
Chris Lattnerd2177732007-07-20 16:59:19 +000058 Token &PeekTok, bool ValueLive,
Reid Spencer5f016e22007-07-11 17:01:13 +000059 Preprocessor &PP);
60
61/// DefinedTracker - This struct is used while parsing expressions to keep track
62/// of whether !defined(X) has been seen.
63///
64/// With this simple scheme, we handle the basic forms:
65/// !defined(X) and !defined X
66/// but we also trivially handle (silly) stuff like:
67/// !!!defined(X) and +!defined(X) and !+!+!defined(X) and !(defined(X)).
68struct DefinedTracker {
69 /// Each time a Value is evaluated, it returns information about whether the
70 /// parsed value is of the form defined(X), !defined(X) or is something else.
71 enum TrackerState {
72 DefinedMacro, // defined(X)
73 NotDefinedMacro, // !defined(X)
74 Unknown // Something else.
75 } State;
76 /// TheMacro - When the state is DefinedMacro or NotDefinedMacro, this
77 /// indicates the macro that was checked.
78 IdentifierInfo *TheMacro;
79};
80
John Thompsona28cc092009-10-30 13:49:06 +000081/// EvaluateDefined - Process a 'defined(sym)' expression.
Chris Lattnera3e008a2009-12-14 05:00:18 +000082static bool EvaluateDefined(PPValue &Result, Token &PeekTok, DefinedTracker &DT,
83 bool ValueLive, Preprocessor &PP) {
John Thompson6fb63ab2013-07-19 18:50:04 +000084 SourceLocation beginLoc(PeekTok.getLocation());
85 Result.setBegin(beginLoc);
John Thompsona28cc092009-10-30 13:49:06 +000086
87 // Get the next token, don't expand it.
Eli Friedman88710f22011-08-03 00:04:13 +000088 PP.LexUnexpandedNonComment(PeekTok);
John Thompsona28cc092009-10-30 13:49:06 +000089
90 // Two options, it can either be a pp-identifier or a (.
91 SourceLocation LParenLoc;
92 if (PeekTok.is(tok::l_paren)) {
93 // Found a paren, remember we saw it and skip it.
94 LParenLoc = PeekTok.getLocation();
Eli Friedman88710f22011-08-03 00:04:13 +000095 PP.LexUnexpandedNonComment(PeekTok);
John Thompsona28cc092009-10-30 13:49:06 +000096 }
97
Douglas Gregor1fbb4472010-08-24 20:21:13 +000098 if (PeekTok.is(tok::code_completion)) {
99 if (PP.getCodeCompletionHandler())
100 PP.getCodeCompletionHandler()->CodeCompleteMacroName(false);
Argyrios Kyrtzidis7d100872011-09-04 03:32:15 +0000101 PP.setCodeCompletionReached();
Eli Friedman88710f22011-08-03 00:04:13 +0000102 PP.LexUnexpandedNonComment(PeekTok);
Douglas Gregor1fbb4472010-08-24 20:21:13 +0000103 }
Stephen Hines6bcf27b2014-05-29 04:14:42 -0700104
John Thompsona28cc092009-10-30 13:49:06 +0000105 // If we don't have a pp-identifier now, this is an error.
Stephen Hines176edba2014-12-01 14:53:08 -0800106 if (PP.CheckMacroName(PeekTok, MU_Other))
John Thompsona28cc092009-10-30 13:49:06 +0000107 return true;
John Thompsona28cc092009-10-30 13:49:06 +0000108
109 // Otherwise, we got an identifier, is it defined to something?
Stephen Hines6bcf27b2014-05-29 04:14:42 -0700110 IdentifierInfo *II = PeekTok.getIdentifierInfo();
John Thompsona28cc092009-10-30 13:49:06 +0000111 Result.Val = II->hasMacroDefinition();
112 Result.Val.setIsUnsigned(false); // Result is signed intmax_t.
113
Stephen Hines6bcf27b2014-05-29 04:14:42 -0700114 MacroDirective *Macro = nullptr;
John Thompsona28cc092009-10-30 13:49:06 +0000115 // If there is a macro, mark it used.
116 if (Result.Val != 0 && ValueLive) {
Argyrios Kyrtzidisc5159782013-02-24 00:05:14 +0000117 Macro = PP.getMacroDirective(II);
Argyrios Kyrtzidisc56fff72013-03-26 17:17:01 +0000118 PP.markMacroAsUsed(Macro->getMacroInfo());
John Thompsona28cc092009-10-30 13:49:06 +0000119 }
120
John Thompson6fb63ab2013-07-19 18:50:04 +0000121 // Save macro token for callback.
122 Token macroToken(PeekTok);
Douglas Gregor3d5f9552011-10-14 00:49:43 +0000123
John Thompsona28cc092009-10-30 13:49:06 +0000124 // If we are in parens, ensure we have a trailing ).
125 if (LParenLoc.isValid()) {
Eli Friedman88710f22011-08-03 00:04:13 +0000126 // Consume identifier.
127 Result.setEnd(PeekTok.getLocation());
128 PP.LexUnexpandedNonComment(PeekTok);
129
John Thompsona28cc092009-10-30 13:49:06 +0000130 if (PeekTok.isNot(tok::r_paren)) {
Stephen Hines651f13c2014-04-23 16:59:28 -0700131 PP.Diag(PeekTok.getLocation(), diag::err_pp_expected_after)
132 << "'defined'" << tok::r_paren;
133 PP.Diag(LParenLoc, diag::note_matching) << tok::l_paren;
John Thompsona28cc092009-10-30 13:49:06 +0000134 return true;
135 }
136 // Consume the ).
137 Result.setEnd(PeekTok.getLocation());
138 PP.LexNonComment(PeekTok);
Eli Friedman88710f22011-08-03 00:04:13 +0000139 } else {
140 // Consume identifier.
141 Result.setEnd(PeekTok.getLocation());
142 PP.LexNonComment(PeekTok);
John Thompsona28cc092009-10-30 13:49:06 +0000143 }
144
John Thompson6fb63ab2013-07-19 18:50:04 +0000145 // Invoke the 'defined' callback.
146 if (PPCallbacks *Callbacks = PP.getPPCallbacks()) {
147 MacroDirective *MD = Macro;
148 // Pass the MacroInfo for the macro name even if the value is dead.
149 if (!MD && Result.Val != 0)
150 MD = PP.getMacroDirective(II);
151 Callbacks->Defined(macroToken, MD,
152 SourceRange(beginLoc, PeekTok.getLocation()));
153 }
154
John Thompsona28cc092009-10-30 13:49:06 +0000155 // Success, remember that we saw defined(X).
156 DT.State = DefinedTracker::DefinedMacro;
157 DT.TheMacro = II;
158 return false;
159}
160
Reid Spencer5f016e22007-07-11 17:01:13 +0000161/// EvaluateValue - Evaluate the token PeekTok (and any others needed) and
162/// return the computed value in Result. Return true if there was an error
163/// parsing. This function also returns information about the form of the
164/// expression in DT. See above for information on what DT means.
165///
166/// If ValueLive is false, then this value is being evaluated in a context where
167/// the result is not used. As such, avoid diagnostics that relate to
168/// evaluation.
Chris Lattner8ed30442008-05-05 06:45:50 +0000169static bool EvaluateValue(PPValue &Result, Token &PeekTok, DefinedTracker &DT,
170 bool ValueLive, Preprocessor &PP) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000171 DT.State = DefinedTracker::Unknown;
Mike Stump1eb44332009-09-09 15:08:12 +0000172
Douglas Gregorf29c5232010-08-24 22:20:20 +0000173 if (PeekTok.is(tok::code_completion)) {
174 if (PP.getCodeCompletionHandler())
175 PP.getCodeCompletionHandler()->CodeCompletePreprocessorExpression();
Argyrios Kyrtzidis7d100872011-09-04 03:32:15 +0000176 PP.setCodeCompletionReached();
Eli Friedman88710f22011-08-03 00:04:13 +0000177 PP.LexNonComment(PeekTok);
Douglas Gregorf29c5232010-08-24 22:20:20 +0000178 }
179
Reid Spencer5f016e22007-07-11 17:01:13 +0000180 // If this token's spelling is a pp-identifier, check to see if it is
181 // 'defined' or if it is a macro. Note that we check here because many
182 // keywords are pp-identifiers, so we can't check the kind.
183 if (IdentifierInfo *II = PeekTok.getIdentifierInfo()) {
Chris Lattnerf8806622009-12-14 04:26:45 +0000184 // Handle "defined X" and "defined(X)".
185 if (II->isStr("defined"))
John Thompsona28cc092009-10-30 13:49:06 +0000186 return(EvaluateDefined(Result, PeekTok, DT, ValueLive, PP));
Chris Lattnerf8806622009-12-14 04:26:45 +0000187
188 // If this identifier isn't 'defined' or one of the special
189 // preprocessor keywords and it wasn't macro expanded, it turns
190 // into a simple 0, unless it is the C++ keyword "true", in which case it
191 // turns into "1".
Eli Friedman9c611372012-09-20 02:38:38 +0000192 if (ValueLive &&
193 II->getTokenID() != tok::kw_true &&
194 II->getTokenID() != tok::kw_false)
Chris Lattnerf8806622009-12-14 04:26:45 +0000195 PP.Diag(PeekTok, diag::warn_pp_undef_identifier) << II;
196 Result.Val = II->getTokenID() == tok::kw_true;
197 Result.Val.setIsUnsigned(false); // "0" is signed intmax_t 0.
198 Result.setRange(PeekTok.getLocation());
199 PP.LexNonComment(PeekTok);
200 return false;
Reid Spencer5f016e22007-07-11 17:01:13 +0000201 }
Mike Stump1eb44332009-09-09 15:08:12 +0000202
Reid Spencer5f016e22007-07-11 17:01:13 +0000203 switch (PeekTok.getKind()) {
204 default: // Non-value token.
Chris Lattnerd98d9752008-04-13 20:38:43 +0000205 PP.Diag(PeekTok, diag::err_pp_expr_bad_token_start_expr);
Reid Spencer5f016e22007-07-11 17:01:13 +0000206 return true;
Peter Collingbourne84021552011-02-28 02:37:51 +0000207 case tok::eod:
Reid Spencer5f016e22007-07-11 17:01:13 +0000208 case tok::r_paren:
209 // If there is no expression, report and exit.
210 PP.Diag(PeekTok, diag::err_pp_expected_value_in_expr);
211 return true;
212 case tok::numeric_constant: {
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +0000213 SmallString<64> IntegerBuffer;
Douglas Gregor50f6af72010-03-16 05:20:39 +0000214 bool NumberInvalid = false;
Chris Lattner5f9e2722011-07-23 10:55:15 +0000215 StringRef Spelling = PP.getSpelling(PeekTok, IntegerBuffer,
Douglas Gregor50f6af72010-03-16 05:20:39 +0000216 &NumberInvalid);
217 if (NumberInvalid)
218 return true; // a diagnostic was already reported
219
Dmitri Gribenkofc97ea22012-09-24 09:53:54 +0000220 NumericLiteralParser Literal(Spelling, PeekTok.getLocation(), PP);
Reid Spencer5f016e22007-07-11 17:01:13 +0000221 if (Literal.hadError)
222 return true; // a diagnostic was already reported.
Mike Stump1eb44332009-09-09 15:08:12 +0000223
Chris Lattner6e400c22007-08-26 03:29:23 +0000224 if (Literal.isFloatingLiteral() || Literal.isImaginary) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000225 PP.Diag(PeekTok, diag::err_pp_illegal_floating_literal);
226 return true;
227 }
228 assert(Literal.isIntegerLiteral() && "Unknown ppnumber");
229
Richard Smithb453ad32012-03-08 08:45:32 +0000230 // Complain about, and drop, any ud-suffix.
231 if (Literal.hasUDSuffix())
232 PP.Diag(PeekTok, diag::err_pp_invalid_udl) << /*integer*/1;
233
Dmitri Gribenkoe3b136b2012-09-24 18:19:21 +0000234 // 'long long' is a C99 or C++11 feature.
235 if (!PP.getLangOpts().C99 && Literal.isLongLong) {
236 if (PP.getLangOpts().CPlusPlus)
237 PP.Diag(PeekTok,
Richard Smith80ad52f2013-01-02 11:42:31 +0000238 PP.getLangOpts().CPlusPlus11 ?
Dmitri Gribenkoe3b136b2012-09-24 18:19:21 +0000239 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
240 else
241 PP.Diag(PeekTok, diag::ext_c99_longlong);
242 }
Neil Boothb9449512007-08-29 22:00:19 +0000243
Reid Spencer5f016e22007-07-11 17:01:13 +0000244 // Parse the integer literal into Result.
Chris Lattner8ed30442008-05-05 06:45:50 +0000245 if (Literal.GetIntegerValue(Result.Val)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000246 // Overflow parsing integer literal.
Stephen Hines176edba2014-12-01 14:53:08 -0800247 if (ValueLive)
248 PP.Diag(PeekTok, diag::err_integer_literal_too_large)
249 << /* Unsigned */ 1;
Chris Lattner8ed30442008-05-05 06:45:50 +0000250 Result.Val.setIsUnsigned(true);
Reid Spencer5f016e22007-07-11 17:01:13 +0000251 } else {
252 // Set the signedness of the result to match whether there was a U suffix
253 // or not.
Chris Lattner8ed30442008-05-05 06:45:50 +0000254 Result.Val.setIsUnsigned(Literal.isUnsigned);
Mike Stump1eb44332009-09-09 15:08:12 +0000255
Reid Spencer5f016e22007-07-11 17:01:13 +0000256 // Detect overflow based on whether the value is signed. If signed
257 // and if the value is too large, emit a warning "integer constant is so
258 // large that it is unsigned" e.g. on 12345678901234567890 where intmax_t
259 // is 64-bits.
Chris Lattner8ed30442008-05-05 06:45:50 +0000260 if (!Literal.isUnsigned && Result.Val.isNegative()) {
Stephen Hines651f13c2014-04-23 16:59:28 -0700261 // Octal, hexadecimal, and binary literals are implicitly unsigned if
262 // the value does not fit into a signed integer type.
Eli Friedmanb3da6132013-07-23 00:25:18 +0000263 if (ValueLive && Literal.getRadix() == 10)
Stephen Hines176edba2014-12-01 14:53:08 -0800264 PP.Diag(PeekTok, diag::ext_integer_literal_too_large_for_signed);
Chris Lattner8ed30442008-05-05 06:45:50 +0000265 Result.Val.setIsUnsigned(true);
Reid Spencer5f016e22007-07-11 17:01:13 +0000266 }
267 }
Mike Stump1eb44332009-09-09 15:08:12 +0000268
Reid Spencer5f016e22007-07-11 17:01:13 +0000269 // Consume the token.
Chris Lattner8ed30442008-05-05 06:45:50 +0000270 Result.setRange(PeekTok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +0000271 PP.LexNonComment(PeekTok);
272 return false;
273 }
Douglas Gregor5cee1192011-07-27 05:40:30 +0000274 case tok::char_constant: // 'x'
Alexander Kornienkod2267442013-01-31 19:03:16 +0000275 case tok::wide_char_constant: // L'x'
Stephen Hines176edba2014-12-01 14:53:08 -0800276 case tok::utf8_char_constant: // u8'x'
Douglas Gregor5cee1192011-07-27 05:40:30 +0000277 case tok::utf16_char_constant: // u'x'
Alexander Kornienkod2267442013-01-31 19:03:16 +0000278 case tok::utf32_char_constant: { // U'x'
Richard Smith99831e42012-03-06 03:21:47 +0000279 // Complain about, and drop, any ud-suffix.
280 if (PeekTok.hasUDSuffix())
Richard Smithb453ad32012-03-08 08:45:32 +0000281 PP.Diag(PeekTok, diag::err_pp_invalid_udl) << /*character*/0;
Richard Smith99831e42012-03-06 03:21:47 +0000282
Dylan Noblesmithf7ccbad2012-02-05 02:13:05 +0000283 SmallString<32> CharBuffer;
Douglas Gregor50f6af72010-03-16 05:20:39 +0000284 bool CharInvalid = false;
Chris Lattner5f9e2722011-07-23 10:55:15 +0000285 StringRef ThisTok = PP.getSpelling(PeekTok, CharBuffer, &CharInvalid);
Douglas Gregor50f6af72010-03-16 05:20:39 +0000286 if (CharInvalid)
287 return true;
Benjamin Kramerddeea562010-02-27 13:44:12 +0000288
289 CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(),
Douglas Gregor5cee1192011-07-27 05:40:30 +0000290 PeekTok.getLocation(), PP, PeekTok.getKind());
Reid Spencer5f016e22007-07-11 17:01:13 +0000291 if (Literal.hadError())
292 return true; // A diagnostic was already emitted.
293
294 // Character literals are always int or wchar_t, expand to intmax_t.
Daniel Dunbar444be732009-11-13 05:51:54 +0000295 const TargetInfo &TI = PP.getTargetInfo();
Eli Friedman2a1c3632009-06-01 05:25:02 +0000296 unsigned NumBits;
297 if (Literal.isMultiChar())
298 NumBits = TI.getIntWidth();
Alisdair Meredithf5c209d2009-07-14 06:30:34 +0000299 else if (Literal.isWide())
300 NumBits = TI.getWCharWidth();
Douglas Gregor5cee1192011-07-27 05:40:30 +0000301 else if (Literal.isUTF16())
302 NumBits = TI.getChar16Width();
303 else if (Literal.isUTF32())
304 NumBits = TI.getChar32Width();
Eli Friedman2a1c3632009-06-01 05:25:02 +0000305 else
Alisdair Meredithf5c209d2009-07-14 06:30:34 +0000306 NumBits = TI.getCharWidth();
Eli Friedman2a1c3632009-06-01 05:25:02 +0000307
Reid Spencer5f016e22007-07-11 17:01:13 +0000308 // Set the width.
309 llvm::APSInt Val(NumBits);
310 // Set the value.
311 Val = Literal.getValue();
Douglas Gregor5cee1192011-07-27 05:40:30 +0000312 // Set the signedness. UTF-16 and UTF-32 are always unsigned
313 if (!Literal.isUTF16() && !Literal.isUTF32())
David Blaikie4e4d0842012-03-11 07:00:24 +0000314 Val.setIsUnsigned(!PP.getLangOpts().CharIsSigned);
Mike Stump1eb44332009-09-09 15:08:12 +0000315
Chris Lattner8ed30442008-05-05 06:45:50 +0000316 if (Result.Val.getBitWidth() > Val.getBitWidth()) {
317 Result.Val = Val.extend(Result.Val.getBitWidth());
Reid Spencer5f016e22007-07-11 17:01:13 +0000318 } else {
Chris Lattner8ed30442008-05-05 06:45:50 +0000319 assert(Result.Val.getBitWidth() == Val.getBitWidth() &&
Reid Spencer5f016e22007-07-11 17:01:13 +0000320 "intmax_t smaller than char/wchar_t?");
Chris Lattner8ed30442008-05-05 06:45:50 +0000321 Result.Val = Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000322 }
323
324 // Consume the token.
Chris Lattner8ed30442008-05-05 06:45:50 +0000325 Result.setRange(PeekTok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +0000326 PP.LexNonComment(PeekTok);
327 return false;
328 }
Chris Lattner8ed30442008-05-05 06:45:50 +0000329 case tok::l_paren: {
330 SourceLocation Start = PeekTok.getLocation();
Reid Spencer5f016e22007-07-11 17:01:13 +0000331 PP.LexNonComment(PeekTok); // Eat the (.
332 // Parse the value and if there are any binary operators involved, parse
333 // them.
334 if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true;
335
336 // If this is a silly value like (X), which doesn't need parens, check for
337 // !(defined X).
Chris Lattner22f6bbc2007-10-09 18:02:16 +0000338 if (PeekTok.is(tok::r_paren)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000339 // Just use DT unmodified as our result.
340 } else {
Chris Lattner8ed30442008-05-05 06:45:50 +0000341 // Otherwise, we have something like (x+y), and we consumed '(x'.
Reid Spencer5f016e22007-07-11 17:01:13 +0000342 if (EvaluateDirectiveSubExpr(Result, 1, PeekTok, ValueLive, PP))
343 return true;
Mike Stump1eb44332009-09-09 15:08:12 +0000344
Chris Lattner22f6bbc2007-10-09 18:02:16 +0000345 if (PeekTok.isNot(tok::r_paren)) {
Chris Lattner204b2fe2008-11-18 21:48:13 +0000346 PP.Diag(PeekTok.getLocation(), diag::err_pp_expected_rparen)
347 << Result.getRange();
Stephen Hines651f13c2014-04-23 16:59:28 -0700348 PP.Diag(Start, diag::note_matching) << tok::l_paren;
Reid Spencer5f016e22007-07-11 17:01:13 +0000349 return true;
350 }
351 DT.State = DefinedTracker::Unknown;
352 }
Chris Lattner8ed30442008-05-05 06:45:50 +0000353 Result.setRange(Start, PeekTok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +0000354 PP.LexNonComment(PeekTok); // Eat the ).
355 return false;
Chris Lattner8ed30442008-05-05 06:45:50 +0000356 }
357 case tok::plus: {
358 SourceLocation Start = PeekTok.getLocation();
Reid Spencer5f016e22007-07-11 17:01:13 +0000359 // Unary plus doesn't modify the value.
360 PP.LexNonComment(PeekTok);
Chris Lattner8ed30442008-05-05 06:45:50 +0000361 if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true;
362 Result.setBegin(Start);
363 return false;
364 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000365 case tok::minus: {
366 SourceLocation Loc = PeekTok.getLocation();
367 PP.LexNonComment(PeekTok);
368 if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true;
Chris Lattner8ed30442008-05-05 06:45:50 +0000369 Result.setBegin(Loc);
Mike Stump1eb44332009-09-09 15:08:12 +0000370
Reid Spencer5f016e22007-07-11 17:01:13 +0000371 // C99 6.5.3.3p3: The sign of the result matches the sign of the operand.
Chris Lattner8ed30442008-05-05 06:45:50 +0000372 Result.Val = -Result.Val;
Mike Stump1eb44332009-09-09 15:08:12 +0000373
Chris Lattnerb081a352008-07-03 03:47:30 +0000374 // -MININT is the only thing that overflows. Unsigned never overflows.
375 bool Overflow = !Result.isUnsigned() && Result.Val.isMinSignedValue();
Mike Stump1eb44332009-09-09 15:08:12 +0000376
Reid Spencer5f016e22007-07-11 17:01:13 +0000377 // If this operator is live and overflowed, report the issue.
378 if (Overflow && ValueLive)
Chris Lattner204b2fe2008-11-18 21:48:13 +0000379 PP.Diag(Loc, diag::warn_pp_expr_overflow) << Result.getRange();
Mike Stump1eb44332009-09-09 15:08:12 +0000380
Reid Spencer5f016e22007-07-11 17:01:13 +0000381 DT.State = DefinedTracker::Unknown;
382 return false;
383 }
Mike Stump1eb44332009-09-09 15:08:12 +0000384
Chris Lattner8ed30442008-05-05 06:45:50 +0000385 case tok::tilde: {
386 SourceLocation Start = PeekTok.getLocation();
Reid Spencer5f016e22007-07-11 17:01:13 +0000387 PP.LexNonComment(PeekTok);
388 if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true;
Chris Lattner8ed30442008-05-05 06:45:50 +0000389 Result.setBegin(Start);
390
Reid Spencer5f016e22007-07-11 17:01:13 +0000391 // C99 6.5.3.3p4: The sign of the result matches the sign of the operand.
Chris Lattner8ed30442008-05-05 06:45:50 +0000392 Result.Val = ~Result.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000393 DT.State = DefinedTracker::Unknown;
394 return false;
Chris Lattner8ed30442008-05-05 06:45:50 +0000395 }
Mike Stump1eb44332009-09-09 15:08:12 +0000396
Chris Lattner8ed30442008-05-05 06:45:50 +0000397 case tok::exclaim: {
398 SourceLocation Start = PeekTok.getLocation();
Reid Spencer5f016e22007-07-11 17:01:13 +0000399 PP.LexNonComment(PeekTok);
400 if (EvaluateValue(Result, PeekTok, DT, ValueLive, PP)) return true;
Chris Lattner8ed30442008-05-05 06:45:50 +0000401 Result.setBegin(Start);
402 Result.Val = !Result.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000403 // C99 6.5.3.3p5: The sign of the result is 'int', aka it is signed.
Chris Lattner8ed30442008-05-05 06:45:50 +0000404 Result.Val.setIsUnsigned(false);
Mike Stump1eb44332009-09-09 15:08:12 +0000405
Reid Spencer5f016e22007-07-11 17:01:13 +0000406 if (DT.State == DefinedTracker::DefinedMacro)
407 DT.State = DefinedTracker::NotDefinedMacro;
408 else if (DT.State == DefinedTracker::NotDefinedMacro)
409 DT.State = DefinedTracker::DefinedMacro;
410 return false;
Chris Lattner8ed30442008-05-05 06:45:50 +0000411 }
Mike Stump1eb44332009-09-09 15:08:12 +0000412
Reid Spencer5f016e22007-07-11 17:01:13 +0000413 // FIXME: Handle #assert
414 }
415}
416
417
418
419/// getPrecedence - Return the precedence of the specified binary operator
420/// token. This returns:
421/// ~0 - Invalid token.
Chris Lattner9e66ba62008-05-05 04:10:51 +0000422/// 14 -> 3 - various operators.
Peter Collingbourne84021552011-02-28 02:37:51 +0000423/// 0 - 'eod' or ')'
Reid Spencer5f016e22007-07-11 17:01:13 +0000424static unsigned getPrecedence(tok::TokenKind Kind) {
425 switch (Kind) {
426 default: return ~0U;
427 case tok::percent:
428 case tok::slash:
429 case tok::star: return 14;
430 case tok::plus:
431 case tok::minus: return 13;
432 case tok::lessless:
433 case tok::greatergreater: return 12;
434 case tok::lessequal:
435 case tok::less:
436 case tok::greaterequal:
437 case tok::greater: return 11;
438 case tok::exclaimequal:
439 case tok::equalequal: return 10;
440 case tok::amp: return 9;
441 case tok::caret: return 8;
442 case tok::pipe: return 7;
443 case tok::ampamp: return 6;
444 case tok::pipepipe: return 5;
Chris Lattner98ed49f2008-05-05 20:07:41 +0000445 case tok::question: return 4;
446 case tok::comma: return 3;
Chris Lattner91891562008-05-04 18:36:18 +0000447 case tok::colon: return 2;
Peter Collingbourne84021552011-02-28 02:37:51 +0000448 case tok::r_paren: return 0;// Lowest priority, end of expr.
449 case tok::eod: return 0;// Lowest priority, end of directive.
Reid Spencer5f016e22007-07-11 17:01:13 +0000450 }
451}
452
453
454/// EvaluateDirectiveSubExpr - Evaluate the subexpression whose first token is
Chris Lattner8ed30442008-05-05 06:45:50 +0000455/// PeekTok, and whose precedence is PeekPrec. This returns the result in LHS.
Reid Spencer5f016e22007-07-11 17:01:13 +0000456///
457/// If ValueLive is false, then this value is being evaluated in a context where
458/// the result is not used. As such, avoid diagnostics that relate to
Chris Lattner8ed30442008-05-05 06:45:50 +0000459/// evaluation, such as division by zero warnings.
460static bool EvaluateDirectiveSubExpr(PPValue &LHS, unsigned MinPrec,
Chris Lattnerd2177732007-07-20 16:59:19 +0000461 Token &PeekTok, bool ValueLive,
Reid Spencer5f016e22007-07-11 17:01:13 +0000462 Preprocessor &PP) {
463 unsigned PeekPrec = getPrecedence(PeekTok.getKind());
464 // If this token isn't valid, report the error.
465 if (PeekPrec == ~0U) {
Chris Lattner204b2fe2008-11-18 21:48:13 +0000466 PP.Diag(PeekTok.getLocation(), diag::err_pp_expr_bad_token_binop)
467 << LHS.getRange();
Reid Spencer5f016e22007-07-11 17:01:13 +0000468 return true;
469 }
Mike Stump1eb44332009-09-09 15:08:12 +0000470
Reid Spencer5f016e22007-07-11 17:01:13 +0000471 while (1) {
472 // If this token has a lower precedence than we are allowed to parse, return
473 // it so that higher levels of the recursion can parse it.
474 if (PeekPrec < MinPrec)
475 return false;
Mike Stump1eb44332009-09-09 15:08:12 +0000476
Reid Spencer5f016e22007-07-11 17:01:13 +0000477 tok::TokenKind Operator = PeekTok.getKind();
Mike Stump1eb44332009-09-09 15:08:12 +0000478
Reid Spencer5f016e22007-07-11 17:01:13 +0000479 // If this is a short-circuiting operator, see if the RHS of the operator is
Mike Stump1eb44332009-09-09 15:08:12 +0000480 // dead. Note that this cannot just clobber ValueLive. Consider
Reid Spencer5f016e22007-07-11 17:01:13 +0000481 // "0 && 1 ? 4 : 1 / 0", which is parsed as "(0 && 1) ? 4 : (1 / 0)". In
482 // this example, the RHS of the && being dead does not make the rest of the
483 // expr dead.
484 bool RHSIsLive;
Chris Lattner8ed30442008-05-05 06:45:50 +0000485 if (Operator == tok::ampamp && LHS.Val == 0)
Reid Spencer5f016e22007-07-11 17:01:13 +0000486 RHSIsLive = false; // RHS of "0 && x" is dead.
Chris Lattner8ed30442008-05-05 06:45:50 +0000487 else if (Operator == tok::pipepipe && LHS.Val != 0)
Reid Spencer5f016e22007-07-11 17:01:13 +0000488 RHSIsLive = false; // RHS of "1 || x" is dead.
Chris Lattner8ed30442008-05-05 06:45:50 +0000489 else if (Operator == tok::question && LHS.Val == 0)
Reid Spencer5f016e22007-07-11 17:01:13 +0000490 RHSIsLive = false; // RHS (x) of "0 ? x : y" is dead.
491 else
492 RHSIsLive = ValueLive;
493
Chris Lattner8ed30442008-05-05 06:45:50 +0000494 // Consume the operator, remembering the operator's location for reporting.
495 SourceLocation OpLoc = PeekTok.getLocation();
Reid Spencer5f016e22007-07-11 17:01:13 +0000496 PP.LexNonComment(PeekTok);
497
Chris Lattner8ed30442008-05-05 06:45:50 +0000498 PPValue RHS(LHS.getBitWidth());
Reid Spencer5f016e22007-07-11 17:01:13 +0000499 // Parse the RHS of the operator.
500 DefinedTracker DT;
501 if (EvaluateValue(RHS, PeekTok, DT, RHSIsLive, PP)) return true;
502
503 // Remember the precedence of this operator and get the precedence of the
504 // operator immediately to the right of the RHS.
505 unsigned ThisPrec = PeekPrec;
506 PeekPrec = getPrecedence(PeekTok.getKind());
507
508 // If this token isn't valid, report the error.
509 if (PeekPrec == ~0U) {
Chris Lattner204b2fe2008-11-18 21:48:13 +0000510 PP.Diag(PeekTok.getLocation(), diag::err_pp_expr_bad_token_binop)
511 << RHS.getRange();
Reid Spencer5f016e22007-07-11 17:01:13 +0000512 return true;
513 }
Mike Stump1eb44332009-09-09 15:08:12 +0000514
Chris Lattner98ed49f2008-05-05 20:07:41 +0000515 // Decide whether to include the next binop in this subexpression. For
516 // example, when parsing x+y*z and looking at '*', we want to recursively
Chris Lattner44cbbb02008-05-05 20:09:27 +0000517 // handle y*z as a single subexpression. We do this because the precedence
518 // of * is higher than that of +. The only strange case we have to handle
519 // here is for the ?: operator, where the precedence is actually lower than
520 // the LHS of the '?'. The grammar rule is:
Chris Lattner98ed49f2008-05-05 20:07:41 +0000521 //
522 // conditional-expression ::=
523 // logical-OR-expression ? expression : conditional-expression
524 // where 'expression' is actually comma-expression.
525 unsigned RHSPrec;
526 if (Operator == tok::question)
527 // The RHS of "?" should be maximally consumed as an expression.
528 RHSPrec = getPrecedence(tok::comma);
529 else // All others should munch while higher precedence.
530 RHSPrec = ThisPrec+1;
Mike Stump1eb44332009-09-09 15:08:12 +0000531
Chris Lattner98ed49f2008-05-05 20:07:41 +0000532 if (PeekPrec >= RHSPrec) {
533 if (EvaluateDirectiveSubExpr(RHS, RHSPrec, PeekTok, RHSIsLive, PP))
Reid Spencer5f016e22007-07-11 17:01:13 +0000534 return true;
535 PeekPrec = getPrecedence(PeekTok.getKind());
536 }
537 assert(PeekPrec <= ThisPrec && "Recursion didn't work!");
Mike Stump1eb44332009-09-09 15:08:12 +0000538
Reid Spencer5f016e22007-07-11 17:01:13 +0000539 // Usual arithmetic conversions (C99 6.3.1.8p1): result is unsigned if
Mike Stump1eb44332009-09-09 15:08:12 +0000540 // either operand is unsigned.
Reid Spencer5f016e22007-07-11 17:01:13 +0000541 llvm::APSInt Res(LHS.getBitWidth());
Chris Lattner019ef7e2008-05-04 23:46:17 +0000542 switch (Operator) {
543 case tok::question: // No UAC for x and y in "x ? y : z".
544 case tok::lessless: // Shift amount doesn't UAC with shift value.
545 case tok::greatergreater: // Shift amount doesn't UAC with shift value.
546 case tok::comma: // Comma operands are not subject to UACs.
547 case tok::pipepipe: // Logical || does not do UACs.
548 case tok::ampamp: // Logical && does not do UACs.
549 break; // No UAC
550 default:
Reid Spencer5f016e22007-07-11 17:01:13 +0000551 Res.setIsUnsigned(LHS.isUnsigned()|RHS.isUnsigned());
552 // If this just promoted something from signed to unsigned, and if the
553 // value was negative, warn about it.
554 if (ValueLive && Res.isUnsigned()) {
Chris Lattner8ed30442008-05-05 06:45:50 +0000555 if (!LHS.isUnsigned() && LHS.Val.isNegative())
Chris Lattner204b2fe2008-11-18 21:48:13 +0000556 PP.Diag(OpLoc, diag::warn_pp_convert_lhs_to_positive)
557 << LHS.Val.toString(10, true) + " to " +
558 LHS.Val.toString(10, false)
559 << LHS.getRange() << RHS.getRange();
Chris Lattner8ed30442008-05-05 06:45:50 +0000560 if (!RHS.isUnsigned() && RHS.Val.isNegative())
Chris Lattner204b2fe2008-11-18 21:48:13 +0000561 PP.Diag(OpLoc, diag::warn_pp_convert_rhs_to_positive)
562 << RHS.Val.toString(10, true) + " to " +
563 RHS.Val.toString(10, false)
564 << LHS.getRange() << RHS.getRange();
Reid Spencer5f016e22007-07-11 17:01:13 +0000565 }
Chris Lattner8ed30442008-05-05 06:45:50 +0000566 LHS.Val.setIsUnsigned(Res.isUnsigned());
567 RHS.Val.setIsUnsigned(Res.isUnsigned());
Reid Spencer5f016e22007-07-11 17:01:13 +0000568 }
Mike Stump1eb44332009-09-09 15:08:12 +0000569
Reid Spencer5f016e22007-07-11 17:01:13 +0000570 bool Overflow = false;
571 switch (Operator) {
David Blaikieb219cfc2011-09-23 05:06:16 +0000572 default: llvm_unreachable("Unknown operator token!");
Reid Spencer5f016e22007-07-11 17:01:13 +0000573 case tok::percent:
Chris Lattner8ed30442008-05-05 06:45:50 +0000574 if (RHS.Val != 0)
575 Res = LHS.Val % RHS.Val;
576 else if (ValueLive) {
Chris Lattner204b2fe2008-11-18 21:48:13 +0000577 PP.Diag(OpLoc, diag::err_pp_remainder_by_zero)
578 << LHS.getRange() << RHS.getRange();
Chris Lattner8ed30442008-05-05 06:45:50 +0000579 return true;
Reid Spencer5f016e22007-07-11 17:01:13 +0000580 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000581 break;
582 case tok::slash:
Chris Lattner8ed30442008-05-05 06:45:50 +0000583 if (RHS.Val != 0) {
Chris Lattnerf9e77342010-10-13 23:46:56 +0000584 if (LHS.Val.isSigned())
585 Res = llvm::APSInt(LHS.Val.sdiv_ov(RHS.Val, Overflow), false);
586 else
587 Res = LHS.Val / RHS.Val;
Chris Lattner8ed30442008-05-05 06:45:50 +0000588 } else if (ValueLive) {
Chris Lattner204b2fe2008-11-18 21:48:13 +0000589 PP.Diag(OpLoc, diag::err_pp_division_by_zero)
590 << LHS.getRange() << RHS.getRange();
Chris Lattner8ed30442008-05-05 06:45:50 +0000591 return true;
Reid Spencer5f016e22007-07-11 17:01:13 +0000592 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000593 break;
Mike Stump1eb44332009-09-09 15:08:12 +0000594
Reid Spencer5f016e22007-07-11 17:01:13 +0000595 case tok::star:
Chris Lattnerf9e77342010-10-13 23:46:56 +0000596 if (Res.isSigned())
597 Res = llvm::APSInt(LHS.Val.smul_ov(RHS.Val, Overflow), false);
598 else
599 Res = LHS.Val * RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000600 break;
601 case tok::lessless: {
602 // Determine whether overflow is about to happen.
Stephen Hines176edba2014-12-01 14:53:08 -0800603 if (LHS.isUnsigned())
604 Res = LHS.Val.ushl_ov(RHS.Val, Overflow);
605 else
606 Res = llvm::APSInt(LHS.Val.sshl_ov(RHS.Val, Overflow), false);
Reid Spencer5f016e22007-07-11 17:01:13 +0000607 break;
608 }
609 case tok::greatergreater: {
610 // Determine whether overflow is about to happen.
Chris Lattner8ed30442008-05-05 06:45:50 +0000611 unsigned ShAmt = static_cast<unsigned>(RHS.Val.getLimitedValue());
Reid Spencer5f016e22007-07-11 17:01:13 +0000612 if (ShAmt >= LHS.getBitWidth())
613 Overflow = true, ShAmt = LHS.getBitWidth()-1;
Chris Lattner8ed30442008-05-05 06:45:50 +0000614 Res = LHS.Val >> ShAmt;
Reid Spencer5f016e22007-07-11 17:01:13 +0000615 break;
616 }
617 case tok::plus:
Reid Spencer5f016e22007-07-11 17:01:13 +0000618 if (LHS.isUnsigned())
Chris Lattnerf9e77342010-10-13 23:46:56 +0000619 Res = LHS.Val + RHS.Val;
620 else
621 Res = llvm::APSInt(LHS.Val.sadd_ov(RHS.Val, Overflow), false);
Reid Spencer5f016e22007-07-11 17:01:13 +0000622 break;
623 case tok::minus:
Reid Spencer5f016e22007-07-11 17:01:13 +0000624 if (LHS.isUnsigned())
Chris Lattnerf9e77342010-10-13 23:46:56 +0000625 Res = LHS.Val - RHS.Val;
626 else
627 Res = llvm::APSInt(LHS.Val.ssub_ov(RHS.Val, Overflow), false);
Reid Spencer5f016e22007-07-11 17:01:13 +0000628 break;
629 case tok::lessequal:
Chris Lattner8ed30442008-05-05 06:45:50 +0000630 Res = LHS.Val <= RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000631 Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed)
632 break;
633 case tok::less:
Chris Lattner8ed30442008-05-05 06:45:50 +0000634 Res = LHS.Val < RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000635 Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed)
636 break;
637 case tok::greaterequal:
Chris Lattner8ed30442008-05-05 06:45:50 +0000638 Res = LHS.Val >= RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000639 Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed)
640 break;
641 case tok::greater:
Chris Lattner8ed30442008-05-05 06:45:50 +0000642 Res = LHS.Val > RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000643 Res.setIsUnsigned(false); // C99 6.5.8p6, result is always int (signed)
644 break;
645 case tok::exclaimequal:
Chris Lattner8ed30442008-05-05 06:45:50 +0000646 Res = LHS.Val != RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000647 Res.setIsUnsigned(false); // C99 6.5.9p3, result is always int (signed)
648 break;
649 case tok::equalequal:
Chris Lattner8ed30442008-05-05 06:45:50 +0000650 Res = LHS.Val == RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000651 Res.setIsUnsigned(false); // C99 6.5.9p3, result is always int (signed)
652 break;
653 case tok::amp:
Chris Lattner8ed30442008-05-05 06:45:50 +0000654 Res = LHS.Val & RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000655 break;
656 case tok::caret:
Chris Lattner8ed30442008-05-05 06:45:50 +0000657 Res = LHS.Val ^ RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000658 break;
659 case tok::pipe:
Chris Lattner8ed30442008-05-05 06:45:50 +0000660 Res = LHS.Val | RHS.Val;
Reid Spencer5f016e22007-07-11 17:01:13 +0000661 break;
662 case tok::ampamp:
Chris Lattner8ed30442008-05-05 06:45:50 +0000663 Res = (LHS.Val != 0 && RHS.Val != 0);
Reid Spencer5f016e22007-07-11 17:01:13 +0000664 Res.setIsUnsigned(false); // C99 6.5.13p3, result is always int (signed)
665 break;
666 case tok::pipepipe:
Chris Lattner8ed30442008-05-05 06:45:50 +0000667 Res = (LHS.Val != 0 || RHS.Val != 0);
Reid Spencer5f016e22007-07-11 17:01:13 +0000668 Res.setIsUnsigned(false); // C99 6.5.14p3, result is always int (signed)
669 break;
670 case tok::comma:
Chris Lattner91891562008-05-04 18:36:18 +0000671 // Comma is invalid in pp expressions in c89/c++ mode, but is valid in C99
672 // if not being evaluated.
David Blaikie4e4d0842012-03-11 07:00:24 +0000673 if (!PP.getLangOpts().C99 || ValueLive)
Chris Lattner204b2fe2008-11-18 21:48:13 +0000674 PP.Diag(OpLoc, diag::ext_pp_comma_expr)
675 << LHS.getRange() << RHS.getRange();
Chris Lattner8ed30442008-05-05 06:45:50 +0000676 Res = RHS.Val; // LHS = LHS,RHS -> RHS.
Mike Stump1eb44332009-09-09 15:08:12 +0000677 break;
Reid Spencer5f016e22007-07-11 17:01:13 +0000678 case tok::question: {
679 // Parse the : part of the expression.
Chris Lattner22f6bbc2007-10-09 18:02:16 +0000680 if (PeekTok.isNot(tok::colon)) {
Stephen Hines651f13c2014-04-23 16:59:28 -0700681 PP.Diag(PeekTok.getLocation(), diag::err_expected)
682 << tok::colon << LHS.getRange() << RHS.getRange();
683 PP.Diag(OpLoc, diag::note_matching) << tok::question;
Reid Spencer5f016e22007-07-11 17:01:13 +0000684 return true;
685 }
686 // Consume the :.
687 PP.LexNonComment(PeekTok);
688
689 // Evaluate the value after the :.
Chris Lattner8ed30442008-05-05 06:45:50 +0000690 bool AfterColonLive = ValueLive && LHS.Val == 0;
691 PPValue AfterColonVal(LHS.getBitWidth());
Reid Spencer5f016e22007-07-11 17:01:13 +0000692 DefinedTracker DT;
693 if (EvaluateValue(AfterColonVal, PeekTok, DT, AfterColonLive, PP))
694 return true;
695
Chris Lattner44cbbb02008-05-05 20:09:27 +0000696 // Parse anything after the : with the same precedence as ?. We allow
697 // things of equal precedence because ?: is right associative.
Chris Lattner98ed49f2008-05-05 20:07:41 +0000698 if (EvaluateDirectiveSubExpr(AfterColonVal, ThisPrec,
Reid Spencer5f016e22007-07-11 17:01:13 +0000699 PeekTok, AfterColonLive, PP))
700 return true;
Mike Stump1eb44332009-09-09 15:08:12 +0000701
Reid Spencer5f016e22007-07-11 17:01:13 +0000702 // Now that we have the condition, the LHS and the RHS of the :, evaluate.
Chris Lattner8ed30442008-05-05 06:45:50 +0000703 Res = LHS.Val != 0 ? RHS.Val : AfterColonVal.Val;
704 RHS.setEnd(AfterColonVal.getRange().getEnd());
Reid Spencer5f016e22007-07-11 17:01:13 +0000705
706 // Usual arithmetic conversions (C99 6.3.1.8p1): result is unsigned if
707 // either operand is unsigned.
708 Res.setIsUnsigned(RHS.isUnsigned() | AfterColonVal.isUnsigned());
Mike Stump1eb44332009-09-09 15:08:12 +0000709
Reid Spencer5f016e22007-07-11 17:01:13 +0000710 // Figure out the precedence of the token after the : part.
711 PeekPrec = getPrecedence(PeekTok.getKind());
712 break;
713 }
714 case tok::colon:
715 // Don't allow :'s to float around without being part of ?: exprs.
Chris Lattner204b2fe2008-11-18 21:48:13 +0000716 PP.Diag(OpLoc, diag::err_pp_colon_without_question)
717 << LHS.getRange() << RHS.getRange();
Reid Spencer5f016e22007-07-11 17:01:13 +0000718 return true;
719 }
720
721 // If this operator is live and overflowed, report the issue.
722 if (Overflow && ValueLive)
Chris Lattner204b2fe2008-11-18 21:48:13 +0000723 PP.Diag(OpLoc, diag::warn_pp_expr_overflow)
724 << LHS.getRange() << RHS.getRange();
Mike Stump1eb44332009-09-09 15:08:12 +0000725
Reid Spencer5f016e22007-07-11 17:01:13 +0000726 // Put the result back into 'LHS' for our next iteration.
Chris Lattner8ed30442008-05-05 06:45:50 +0000727 LHS.Val = Res;
728 LHS.setEnd(RHS.getRange().getEnd());
Reid Spencer5f016e22007-07-11 17:01:13 +0000729 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000730}
731
732/// EvaluateDirectiveExpression - Evaluate an integer constant expression that
733/// may occur after a #if or #elif directive. If the expression is equivalent
734/// to "!defined(X)" return X in IfNDefMacro.
735bool Preprocessor::
736EvaluateDirectiveExpression(IdentifierInfo *&IfNDefMacro) {
David Blaikieabc0bea2013-03-18 23:22:28 +0000737 SaveAndRestore<bool> PPDir(ParsingIfOrElifDirective, true);
Chris Lattnera3e008a2009-12-14 05:00:18 +0000738 // Save the current state of 'DisableMacroExpansion' and reset it to false. If
739 // 'DisableMacroExpansion' is true, then we must be in a macro argument list
740 // in which case a directive is undefined behavior. We want macros to be able
741 // to recursively expand in order to get more gcc-list behavior, so we force
742 // DisableMacroExpansion to false and restore it when we're done parsing the
743 // expression.
744 bool DisableMacroExpansionAtStartOfDirective = DisableMacroExpansion;
745 DisableMacroExpansion = false;
746
Reid Spencer5f016e22007-07-11 17:01:13 +0000747 // Peek ahead one token.
Chris Lattnerd2177732007-07-20 16:59:19 +0000748 Token Tok;
Eli Friedman88710f22011-08-03 00:04:13 +0000749 LexNonComment(Tok);
Douglas Gregor1fbb4472010-08-24 20:21:13 +0000750
Reid Spencer5f016e22007-07-11 17:01:13 +0000751 // C99 6.10.1p3 - All expressions are evaluated as intmax_t or uintmax_t.
Chris Lattner98be4942008-03-05 18:54:05 +0000752 unsigned BitWidth = getTargetInfo().getIntMaxTWidth();
Mike Stump1eb44332009-09-09 15:08:12 +0000753
Chris Lattner8ed30442008-05-05 06:45:50 +0000754 PPValue ResVal(BitWidth);
Reid Spencer5f016e22007-07-11 17:01:13 +0000755 DefinedTracker DT;
756 if (EvaluateValue(ResVal, Tok, DT, true, *this)) {
757 // Parse error, skip the rest of the macro line.
Peter Collingbourne84021552011-02-28 02:37:51 +0000758 if (Tok.isNot(tok::eod))
Reid Spencer5f016e22007-07-11 17:01:13 +0000759 DiscardUntilEndOfDirective();
Chris Lattnera3e008a2009-12-14 05:00:18 +0000760
761 // Restore 'DisableMacroExpansion'.
762 DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective;
Reid Spencer5f016e22007-07-11 17:01:13 +0000763 return false;
764 }
Mike Stump1eb44332009-09-09 15:08:12 +0000765
Reid Spencer5f016e22007-07-11 17:01:13 +0000766 // If we are at the end of the expression after just parsing a value, there
767 // must be no (unparenthesized) binary operators involved, so we can exit
768 // directly.
Peter Collingbourne84021552011-02-28 02:37:51 +0000769 if (Tok.is(tok::eod)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000770 // If the expression we parsed was of the form !defined(macro), return the
771 // macro in IfNDefMacro.
772 if (DT.State == DefinedTracker::NotDefinedMacro)
773 IfNDefMacro = DT.TheMacro;
Mike Stump1eb44332009-09-09 15:08:12 +0000774
Chris Lattnera3e008a2009-12-14 05:00:18 +0000775 // Restore 'DisableMacroExpansion'.
776 DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective;
Chris Lattner8ed30442008-05-05 06:45:50 +0000777 return ResVal.Val != 0;
Reid Spencer5f016e22007-07-11 17:01:13 +0000778 }
Mike Stump1eb44332009-09-09 15:08:12 +0000779
Reid Spencer5f016e22007-07-11 17:01:13 +0000780 // Otherwise, we must have a binary operator (e.g. "#if 1 < 2"), so parse the
781 // operator and the stuff after it.
Chris Lattner98ed49f2008-05-05 20:07:41 +0000782 if (EvaluateDirectiveSubExpr(ResVal, getPrecedence(tok::question),
783 Tok, true, *this)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000784 // Parse error, skip the rest of the macro line.
Peter Collingbourne84021552011-02-28 02:37:51 +0000785 if (Tok.isNot(tok::eod))
Reid Spencer5f016e22007-07-11 17:01:13 +0000786 DiscardUntilEndOfDirective();
Chris Lattnera3e008a2009-12-14 05:00:18 +0000787
788 // Restore 'DisableMacroExpansion'.
789 DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective;
Reid Spencer5f016e22007-07-11 17:01:13 +0000790 return false;
791 }
Mike Stump1eb44332009-09-09 15:08:12 +0000792
Peter Collingbourne84021552011-02-28 02:37:51 +0000793 // If we aren't at the tok::eod token, something bad happened, like an extra
Reid Spencer5f016e22007-07-11 17:01:13 +0000794 // ')' token.
Peter Collingbourne84021552011-02-28 02:37:51 +0000795 if (Tok.isNot(tok::eod)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000796 Diag(Tok, diag::err_pp_expected_eol);
797 DiscardUntilEndOfDirective();
798 }
Mike Stump1eb44332009-09-09 15:08:12 +0000799
Chris Lattnera3e008a2009-12-14 05:00:18 +0000800 // Restore 'DisableMacroExpansion'.
801 DisableMacroExpansion = DisableMacroExpansionAtStartOfDirective;
Chris Lattner8ed30442008-05-05 06:45:50 +0000802 return ResVal.Val != 0;
Reid Spencer5f016e22007-07-11 17:01:13 +0000803}