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validate matching constraints and remember when we see them.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25892 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-02-02 00:23:53 +00:00
parent ab77f73aee
commit 2f0eec6520
1 changed files with 15 additions and 5 deletions
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20
lib/VMCore/InlineAsm.cpp
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@ -42,13 +42,15 @@ const FunctionType *InlineAsm::getFunctionType() const {
/// Parse - Analyze the specified string (e.g. "==&{eax}") and fill in the
/// fields in this structure. If the constraint string is not understood,
/// return true, otherwise return false.
bool InlineAsm::ConstraintInfo::Parse(const std::string &Str) {
bool InlineAsm::ConstraintInfo::Parse(const std::string &Str,
std::vector<InlineAsm::ConstraintInfo> &ConstraintsSoFar) {
std::string::const_iterator I = Str.begin(), E = Str.end();
// Initialize
Type = isInput;
isEarlyClobber = false;
isIndirectOutput =false;
isIndirectOutput = false;
hasMatchingInput = false;
// Parse the prefix.
if (*I == '~') {
@ -94,12 +96,20 @@ bool InlineAsm::ConstraintInfo::Parse(const std::string &Str) {
if (ConstraintEnd == E) return true; // "{foo"
Codes.push_back(std::string(I, ConstraintEnd+1));
I = ConstraintEnd+1;
} else if (isdigit(*I)) {
} else if (isdigit(*I)) { // Matching Constraint
// Maximal munch numbers.
std::string::const_iterator NumStart = I;
while (I != E && isdigit(*I))
++I;
Codes.push_back(std::string(NumStart, I));
unsigned N = atoi(Codes.back().c_str());
// Check that this is a valid matching constraint!
if (N >= ConstraintsSoFar.size() || ConstraintsSoFar[N].Type != isOutput||
Type != isInput)
return true; // Invalid constraint number.
// Note that operand #n has a matching input.
ConstraintsSoFar[N].hasMatchingInput = true;
} else {
// Single letter constraint.
Codes.push_back(std::string(I, I+1));
@ -123,8 +133,8 @@ InlineAsm::ParseConstraints(const std::string &Constraints) {
std::string::const_iterator ConstraintEnd = std::find(I, E, ',');
if (ConstraintEnd == I || // Empty constraint like ",,"
Info.Parse(std::string(I, ConstraintEnd))) { // Erroneous constraint?
Result.clear();
Info.Parse(std::string(I, ConstraintEnd), Result)) {
Result.clear(); // Erroneous constraint?
break;
}