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add facilities to start factoring instruction metadata parsing

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out of each opcode's handler.  Change ret over so far.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92298 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-12-30 05:23:43 +00:00
parent 628c13ad76
commit f1bc7ce7b3
2 changed files with 33 additions and 14 deletions
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37
lib/AsmParser/LLParser.cpp
View File

@ -2813,10 +2813,26 @@ bool LLParser::ParseBasicBlock(PerFunctionState &PFS) {
return true;
}
if (ParseInstruction(Inst, BB, PFS)) return true;
if (EatIfPresent(lltok::comma))
ParseOptionalCustomMetadata();
switch (ParseInstruction(Inst, BB, PFS)) {
default: assert(0 && "Unknown ParseInstruction result!");
case InstError: return true;
case InstNormal:
// With a normal result, we check to see if the instruction is followed by
// a comma and metadata.
if (EatIfPresent(lltok::comma))
if (ParseOptionalCustomMetadata())
return true;
break;
case InstExtraComma:
// If the instruction parser ate an extra comma at the end of it, it
// *must* be followed by metadata.
if (Lex.getKind() != lltok::MetadataVar)
return TokError("expected metadata after comma");
// Parse it.
if (ParseOptionalCustomMetadata())
return true;
break;
}
// Set metadata attached with this instruction.
for (SmallVector<std::pair<unsigned, MDNode *>, 2>::iterator
@ -2839,8 +2855,8 @@ bool LLParser::ParseBasicBlock(PerFunctionState &PFS) {
/// ParseInstruction - Parse one of the many different instructions.
///
bool LLParser::ParseInstruction(Instruction *&Inst, BasicBlock *BB,
PerFunctionState &PFS) {
int LLParser::ParseInstruction(Instruction *&Inst, BasicBlock *BB,
PerFunctionState &PFS) {
lltok::Kind Token = Lex.getKind();
if (Token == lltok::Eof)
return TokError("found end of file when expecting more instructions");
@ -3008,8 +3024,8 @@ bool LLParser::ParseCmpPredicate(unsigned &P, unsigned Opc) {
/// ::= 'ret' TypeAndValue (',' !dbg, !1)*
/// ::= 'ret' TypeAndValue (',' TypeAndValue)+ (',' !dbg, !1)*
/// [[obsolete: LLVM 3.0]]
bool LLParser::ParseRet(Instruction *&Inst, BasicBlock *BB,
PerFunctionState &PFS) {
int LLParser::ParseRet(Instruction *&Inst, BasicBlock *BB,
PerFunctionState &PFS) {
PATypeHolder Ty(Type::getVoidTy(Context));
if (ParseType(Ty, true /*void allowed*/)) return true;
@ -3021,10 +3037,11 @@ bool LLParser::ParseRet(Instruction *&Inst, BasicBlock *BB,
Value *RV;
if (ParseValue(Ty, RV, PFS)) return true;
bool ExtraComma = false;
if (EatIfPresent(lltok::comma)) {
// Parse optional custom metadata, e.g. !dbg
if (Lex.getKind() == lltok::MetadataVar) {
if (ParseOptionalCustomMetadata()) return true;
ExtraComma = true;
} else {
// The normal case is one return value.
// FIXME: LLVM 3.0 remove MRV support for 'ret i32 1, i32 2', requiring
@ -3051,7 +3068,7 @@ bool LLParser::ParseRet(Instruction *&Inst, BasicBlock *BB,
}
Inst = ReturnInst::Create(Context, RV);
return false;
return ExtraComma ? InstExtraComma : InstNormal;
}

10
lib/AsmParser/LLParser.h
View File

@ -316,12 +316,14 @@ namespace llvm {
bool ParseFunctionBody(Function &Fn);
bool ParseBasicBlock(PerFunctionState &PFS);
// Instruction Parsing.
bool ParseInstruction(Instruction *&Inst, BasicBlock *BB,
PerFunctionState &PFS);
// Instruction Parsing. Each instruction parsing routine can return with a
// normal result, an error result, or return having eaten an extra comma.
enum InstResult { InstNormal = 0, InstError = 1, InstExtraComma = 2 };
int ParseInstruction(Instruction *&Inst, BasicBlock *BB,
PerFunctionState &PFS);
bool ParseCmpPredicate(unsigned &Pred, unsigned Opc);
bool ParseRet(Instruction *&Inst, BasicBlock *BB, PerFunctionState &PFS);
int ParseRet(Instruction *&Inst, BasicBlock *BB, PerFunctionState &PFS);
bool ParseBr(Instruction *&Inst, PerFunctionState &PFS);
bool ParseSwitch(Instruction *&Inst, PerFunctionState &PFS);
bool ParseIndirectBr(Instruction *&Inst, PerFunctionState &PFS);