mharoush updated this revision to Diff 101688.
mharoush marked an inline comment as done.
mharoush added a comment.
Simplified the AsmRewrite condition in x86AsmParser. Some fixes to simplify the
Intel State Machine immediate value rewrite treatment divergence.
Repository:
rL LLVM
https://reviews.llvm.org/D33278
Files:
include/llvm/MC/MCParser/MCAsmParser.h
lib/Target/X86/AsmParser/X86AsmParser.cpp
Index: lib/Target/X86/AsmParser/X86AsmParser.cpp
===================================================================
--- lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -713,12 +713,13 @@
std::unique_ptr<X86Operand> ParseIntelOffsetOfOperator();
bool ParseIntelDotOperator(const MCExpr *Disp, const MCExpr *&NewDisp);
unsigned IdentifyIntelOperator(StringRef Name);
- unsigned ParseIntelOperator(unsigned OpKind);
+ unsigned ParseIntelOperator(unsigned OpKind, bool AddImmPrefix);
std::unique_ptr<X86Operand>
ParseIntelSegmentOverride(unsigned SegReg, SMLoc Start, unsigned Size);
std::unique_ptr<X86Operand> ParseRoundingModeOp(SMLoc Start, SMLoc End);
bool ParseIntelNamedOperator(StringRef Name, IntelExprStateMachine &SM);
- bool ParseIntelExpression(IntelExprStateMachine &SM, SMLoc &End);
+ bool ParseIntelExpression(IntelExprStateMachine &SM, SMLoc &End,
+ bool &ReplaceEnumIdentifier);
std::unique_ptr<X86Operand>
ParseIntelBracExpression(unsigned SegReg, SMLoc Start, int64_t ImmDisp,
bool isSymbol, unsigned Size);
@@ -1187,7 +1188,7 @@
InlineAsmIdentifierInfo &Info, bool AllowBetterSizeMatch) {
// If we found a decl other than a VarDecl, then assume it is a FuncDecl or
// some other label reference.
- if (isa<MCSymbolRefExpr>(Disp) && Info.OpDecl && !Info.IsVarDecl) {
+ if (isa<MCSymbolRefExpr>(Disp) && Info.OpDecl && !Info.isVarDecl()) {
// Insert an explicit size if the user didn't have one.
if (!Size) {
Size = getPointerWidth();
@@ -1306,8 +1307,9 @@
return false;
return true;
}
-
-bool X86AsmParser::ParseIntelExpression(IntelExprStateMachine &SM, SMLoc &End) {
+bool X86AsmParser::ParseIntelExpression(IntelExprStateMachine &SM, SMLoc &End,
+ bool &ReplaceEnumIdentifier) {
+ ReplaceEnumIdentifier = false;
MCAsmParser &Parser = getParser();
const AsmToken &Tok = Parser.getTok();
@@ -1358,7 +1360,7 @@
if (OpKind == IOK_OFFSET)
return Error(IdentLoc, "Dealing OFFSET operator as part of"
"a compound immediate expression is yet to be supported");
- int64_t Val = ParseIntelOperator(OpKind);
+ int64_t Val = ParseIntelOperator(OpKind,SM.getAddImmPrefix());
if (!Val)
return true;
StringRef ErrMsg;
@@ -1368,11 +1370,39 @@
PrevTK == AsmToken::RBrac) {
return false;
} else {
- InlineAsmIdentifierInfo &Info = SM.getIdentifierInfo();
+ InlineAsmIdentifierInfo Info;
if (ParseIntelIdentifier(Val, Identifier, Info,
/*Unevaluated=*/false, End))
return true;
- SM.onIdentifierExpr(Val, Identifier);
+ // Check if the parsed identifier was a constant Integer. Here we
+ // assume Val is of type MCConstantExpr only when it is safe to replace
+ // the identifier with its constant value.
+ if (const MCConstantExpr *CE =
+ dyn_cast_or_null<const MCConstantExpr>(Val)) {
+ StringRef ErrMsg;
+ // SM should treat the value as it would an explicit integer in the
+ // expression.
+ if(SM.onInteger(CE->getValue(), ErrMsg))
+ return Error(IdentLoc, ErrMsg);
+ // In case we are called on a bracketed expression,
+ if (isParsingInlineAsm() && SM.getAddImmPrefix()) {
+ // A single rewrite of the integer value is preformed for each enum
+ // identifier. This is only done when we are inside a bracketed
+ // expression in order to match the behavior for the equivalent
+ // integer tokens.
+ size_t Len = End.getPointer() - IdentLoc.getPointer();
+ InstInfo->AsmRewrites->emplace_back(AOK_Imm, IdentLoc,Len,
+ CE->getValue());
+ break;
+ }
+ // Set force rewrite flag only when not bracketed expression.
+ ReplaceEnumIdentifier = true;
+ } else {
+ // Notify the SM a variable identifier was found.
+ InlineAsmIdentifierInfo &SMInfo = SM.getIdentifierInfo();
+ SMInfo = Info;
+ SM.onIdentifierExpr(Val, Identifier);
+ }
}
break;
}
@@ -1452,7 +1482,8 @@
// may have already parsed an immediate displacement before the bracketed
// expression.
IntelExprStateMachine SM(ImmDisp, /*StopOnLBrac=*/false, /*AddImmPrefix=*/true);
- if (ParseIntelExpression(SM, End))
+ bool ReplaceEnumIdentifier;
+ if (ParseIntelExpression(SM, End, ReplaceEnumIdentifier))
return nullptr;
const MCExpr *Disp = nullptr;
@@ -1560,6 +1591,14 @@
assert((End.getPointer() == EndPtr || !Result) &&
"frontend claimed part of a token?");
+ // Check if the search yielded a constant integer (enum identifier).
+ if (Result && Info.isConstEnum()) {
+ // By creating MCConstantExpr we let the user of Val know it is safe
+ // to use as an explicit constant with value = ConstVal.
+ Val = MCConstantExpr::create(Info.ConstIntValue.getSExtValue(),
+ getParser().getContext());
+ return false;
+ }
// If the identifier lookup was unsuccessful, assume that we are dealing with
// a label.
if (!Result) {
@@ -1758,7 +1797,7 @@
/// variable. A variable's size is the product of its LENGTH and TYPE. The
/// TYPE operator returns the size of a C or C++ type or variable. If the
/// variable is an array, TYPE returns the size of a single element.
-unsigned X86AsmParser::ParseIntelOperator(unsigned OpKind) {
+unsigned X86AsmParser::ParseIntelOperator(unsigned OpKind, bool AddImmPrefix) {
MCAsmParser &Parser = getParser();
const AsmToken &Tok = Parser.getTok();
SMLoc TypeLoc = Tok.getLoc();
@@ -1784,12 +1823,13 @@
case IOK_SIZE: CVal = Info.Size; break;
case IOK_TYPE: CVal = Info.Type; break;
}
-
- // Rewrite the type operator and the C or C++ type or variable in terms of an
- // immediate. E.g. TYPE foo -> $$4
- unsigned Len = End.getPointer() - TypeLoc.getPointer();
- InstInfo->AsmRewrites->emplace_back(AOK_Imm, TypeLoc, Len, CVal);
-
+ // Only when in bracketed mode, preform explicit rewrite
+ if (AddImmPrefix) {
+ // Rewrite the type operator and the C or C++ type or variable in terms of
+ // an immediate. E.g. TYPE foo -> $$4
+ unsigned Len = End.getPointer() - TypeLoc.getPointer();
+ InstInfo->AsmRewrites->emplace_back(AOK_Imm, TypeLoc, Len, CVal);
+ }
return CVal;
}
@@ -1852,23 +1892,24 @@
AsmToken StartTok = Tok;
IntelExprStateMachine SM(/*Imm=*/0, /*StopOnLBrac=*/true,
/*AddImmPrefix=*/false);
- if (ParseIntelExpression(SM, End))
+ // The parsed expression may contain enum identifier tokens which we must
+ // replace, ReplaceEnumIdentifier flag lets us know when to force rewrite.
+ bool ReplaceEnumIdentifier;
+ if (ParseIntelExpression(SM, End, ReplaceEnumIdentifier))
return nullptr;
-
bool isSymbol = SM.getSym() && SM.getSym()->getKind() != MCExpr::Constant;
int64_t Imm = SM.getImm();
if (SM.getSym() && SM.getSym()->getKind() == MCExpr::Constant)
SM.getSym()->evaluateAsAbsolute(Imm);
- if (StartTok.isNot(AsmToken::Identifier) &&
- StartTok.isNot(AsmToken::String) && isParsingInlineAsm()) {
+ if (isParsingInlineAsm() && !isSymbol) {
unsigned Len = Tok.getLoc().getPointer() - Start.getPointer();
- if (StartTok.getString().size() == Len)
- // Just add a prefix if this wasn't a complex immediate expression.
- InstInfo->AsmRewrites->emplace_back(AOK_ImmPrefix, Start);
- else
- // Otherwise, rewrite the complex expression as a single immediate.
+ if (StartTok.getString().size() != Len || ReplaceEnumIdentifier)
+ // Rewrite the complex expression as a single immediate.
InstInfo->AsmRewrites->emplace_back(AOK_Imm, Start, Len, Imm);
+ else
+ // Otherwise, just add a prefix if this wasn't a complex immediate expression.
+ InstInfo->AsmRewrites->emplace_back(AOK_ImmPrefix, Start);
}
if (getLexer().isNot(AsmToken::LBrac)) {
Index: include/llvm/MC/MCParser/MCAsmParser.h
===================================================================
--- include/llvm/MC/MCParser/MCAsmParser.h
+++ include/llvm/MC/MCParser/MCAsmParser.h
@@ -35,17 +35,30 @@
class SourceMgr;
class InlineAsmIdentifierInfo {
+private:
+ enum IdDeclKind : uint8_t {
+ Default,
+ Variable,
+ ConstEnum,
+ };
+ IdDeclKind Kind;
+
public:
void *OpDecl;
- bool IsVarDecl;
unsigned Length, Size, Type;
-
+ APInt ConstIntValue;
+ bool isVarDecl() { return Kind == Variable; }
+ bool isConstEnum() { return Kind == ConstEnum; }
+ void setKindVariable() { Kind = Variable; }
+ void setKindConstEnum() { Kind = ConstEnum; }
void clear() {
OpDecl = nullptr;
- IsVarDecl = false;
+ Kind = Default;
Length = 1;
Size = 0;
Type = 0;
+ // On clear flush possibly old APInt value as a precaution;
+ ConstIntValue = APInt();
}
};
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