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authorEli Bendersky <eliben@google.com>2012-12-01 21:54:48 +0000
committerEli Bendersky <eliben@google.com>2012-12-01 21:54:48 +0000
commit9756ca7ba0c7f6c3b1e76ee12ca27ddca04be9d7 (patch)
treed3b2ac2fab70086bfacbdd66a7be4e9728cc6738 /utils/FileCheck
parent4fe6d0341daa95c639db8e70450bd8ae243fe344 (diff)
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Support referencing variables defined on the same line.
See http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20121126/157198.html and related discussions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169101 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'utils/FileCheck')
-rw-r--r--utils/FileCheck/FileCheck.cpp56
1 files changed, 40 insertions, 16 deletions
diff --git a/utils/FileCheck/FileCheck.cpp b/utils/FileCheck/FileCheck.cpp
index fb66ac2..7b330d5 100644
--- a/utils/FileCheck/FileCheck.cpp
+++ b/utils/FileCheck/FileCheck.cpp
@@ -29,6 +29,9 @@
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include <algorithm>
+#include <map>
+#include <string>
+#include <vector>
using namespace llvm;
static cl::opt<std::string>
@@ -73,11 +76,10 @@ class Pattern {
/// value of bar at offset 3.
std::vector<std::pair<StringRef, unsigned> > VariableUses;
- /// VariableDefs - Entries in this vector map to definitions of a variable in
- /// the pattern, e.g. "foo[[bar:.*]]baz". In this case, the RegExStr will
- /// contain "foo(.*)baz" and VariableDefs will contain the pair "bar",1. The
- /// index indicates what parenthesized value captures the variable value.
- std::vector<std::pair<StringRef, unsigned> > VariableDefs;
+ /// VariableDefs - Maps definitions of variables to their parenthesized
+ /// capture numbers.
+ /// E.g. for the pattern "foo[[bar:.*]]baz", VariableDefs will map "bar" to 1.
+ std::map<StringRef, unsigned> VariableDefs;
public:
@@ -105,7 +107,8 @@ public:
private:
static void AddFixedStringToRegEx(StringRef FixedStr, std::string &TheStr);
- bool AddRegExToRegEx(StringRef RegExStr, unsigned &CurParen, SourceMgr &SM);
+ bool AddRegExToRegEx(StringRef RS, unsigned &CurParen, SourceMgr &SM);
+ void AddBackrefToRegEx(unsigned BackrefNum);
/// ComputeMatchDistance - Compute an arbitrary estimate for the quality of
/// matching this pattern at the start of \arg Buffer; a distance of zero
@@ -238,12 +241,25 @@ bool Pattern::ParsePattern(StringRef PatternStr, SourceMgr &SM,
// Handle [[foo]].
if (NameEnd == StringRef::npos) {
- VariableUses.push_back(std::make_pair(Name, RegExStr.size()));
+ // Handle variables that were defined earlier on the same line by
+ // emitting a backreference.
+ if (VariableDefs.find(Name) != VariableDefs.end()) {
+ unsigned VarParenNum = VariableDefs[Name];
+ if (VarParenNum < 1 || VarParenNum > 9) {
+ SM.PrintMessage(SMLoc::getFromPointer(Name.data()),
+ SourceMgr::DK_Error,
+ "Can't back-reference more than 9 variables");
+ return true;
+ }
+ AddBackrefToRegEx(VarParenNum);
+ } else {
+ VariableUses.push_back(std::make_pair(Name, RegExStr.size()));
+ }
continue;
}
// Handle [[foo:.*]].
- VariableDefs.push_back(std::make_pair(Name, CurParen));
+ VariableDefs[Name] = CurParen;
RegExStr += '(';
++CurParen;
@@ -291,21 +307,28 @@ void Pattern::AddFixedStringToRegEx(StringRef FixedStr, std::string &TheStr) {
}
}
-bool Pattern::AddRegExToRegEx(StringRef RegexStr, unsigned &CurParen,
+bool Pattern::AddRegExToRegEx(StringRef RS, unsigned &CurParen,
SourceMgr &SM) {
- Regex R(RegexStr);
+ Regex R(RS);
std::string Error;
if (!R.isValid(Error)) {
- SM.PrintMessage(SMLoc::getFromPointer(RegexStr.data()), SourceMgr::DK_Error,
+ SM.PrintMessage(SMLoc::getFromPointer(RS.data()), SourceMgr::DK_Error,
"invalid regex: " + Error);
return true;
}
- RegExStr += RegexStr.str();
+ RegExStr += RS.str();
CurParen += R.getNumMatches();
return false;
}
+void Pattern::AddBackrefToRegEx(unsigned BackrefNum) {
+ assert(BackrefNum >= 1 && BackrefNum <= 9 && "Invalid backref number");
+ std::string Backref = std::string("\\") +
+ std::string(1, '0' + BackrefNum);
+ RegExStr += Backref;
+}
+
bool Pattern::EvaluateExpression(StringRef Expr, std::string &Value) const {
// The only supported expression is @LINE([\+-]\d+)?
if (!Expr.startswith("@LINE"))
@@ -388,10 +411,11 @@ size_t Pattern::Match(StringRef Buffer, size_t &MatchLen,
StringRef FullMatch = MatchInfo[0];
// If this defines any variables, remember their values.
- for (unsigned i = 0, e = VariableDefs.size(); i != e; ++i) {
- assert(VariableDefs[i].second < MatchInfo.size() &&
- "Internal paren error");
- VariableTable[VariableDefs[i].first] = MatchInfo[VariableDefs[i].second];
+ for (std::map<StringRef, unsigned>::const_iterator I = VariableDefs.begin(),
+ E = VariableDefs.end();
+ I != E; ++I) {
+ assert(I->second < MatchInfo.size() && "Internal paren error");
+ VariableTable[I->first] = MatchInfo[I->second];
}
MatchLen = FullMatch.size();