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[ms-inline asm] Have patchMSAsmStrings() return a vector or AsmStrings. 

The AsmParser expects a single asm instruction, but valid ms-style inline asm
statements may contain  multiple instructions.

This happens with asm blocks

__asm {
  mov ebx, eax
  mov ecx, ebx
}

or when multiple asm statements are adjacent to one another

__asm mov ebx, eax
__asm mov ecx, ebx

and

__asm mov ebx, eax __asm mov ecx, ebx

Currently, asm blocks are not properly handled.

llvm-svn: 161780
This commit is contained in:
Chad Rosier 2012-08-13 20:32:07 +00:00
parent ef8bf4368e
commit 65a8e0b69f
2 changed files with 112 additions and 63 deletions
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143
clang/lib/Sema/SemaStmt.cpp
View File

@ -2794,60 +2794,71 @@ static inline bool needSpaceAsmToken(Token currTok) {
return true;
}
static std::string PatchMSAsmString(Sema &SemaRef, bool &IsSimple,
SourceLocation AsmLoc,
ArrayRef<Token> AsmToks,
const TargetInfo &TI) {
static void patchMSAsmStrings(Sema &SemaRef, bool &IsSimple,
SourceLocation AsmLoc,
ArrayRef<Token> AsmToks,
ArrayRef<unsigned> LineEnds,
const TargetInfo &TI,
std::vector<std::string> &AsmStrings) {
assert (!AsmToks.empty() && "Didn't expect an empty AsmToks!");
std::string Res;
IdentifierInfo *II = AsmToks[0].getIdentifierInfo();
Res = II->getName().str();
// Assume simple asm stmt until we parse a non-register identifer.
IsSimple = true;
// Check the operands.
for (unsigned i = 1, e = AsmToks.size(); i != e; ++i) {
if (needSpaceAsmToken(AsmToks[i]))
Res += " ";
for (unsigned i = 0, e = LineEnds.size(); i != e; ++i) {
SmallString<512> Asm;
switch (AsmToks[i].getKind()) {
default:
//llvm_unreachable("Unknown token.");
break;
case tok::comma: Res += ","; break;
case tok::colon: Res += ":"; break;
case tok::l_square: Res += "["; break;
case tok::r_square: Res += "]"; break;
case tok::l_brace: Res += "{"; break;
case tok::r_brace: Res += "}"; break;
case tok::numeric_constant: {
SmallString<32> TokenBuf;
TokenBuf.resize(32);
bool StringInvalid = false;
const char *ThisTokBuf = &TokenBuf[0];
unsigned ThisTokLen =
Lexer::getSpelling(AsmToks[i], ThisTokBuf, SemaRef.getSourceManager(),
SemaRef.getLangOpts(), &StringInvalid);
Res += StringRef(ThisTokBuf, ThisTokLen);
break;
}
case tok::identifier: {
II = AsmToks[i].getIdentifierInfo();
StringRef Name = II->getName();
// Check the operands.
for (unsigned j = (i == 0) ? 0 : LineEnds[i-1], e = LineEnds[i]; j != e; ++j) {
// Valid registers don't need modification.
if (TI.isValidGCCRegisterName(Name)) {
Res += Name;
break;
IdentifierInfo *II;
if (j == 0 || (i > 0 && j == LineEnds[i-1])) {
II = AsmToks[j].getIdentifierInfo();
Asm = II->getName().str();
continue;
}
// TODO: Lookup the identifier.
IsSimple = false;
if (needSpaceAsmToken(AsmToks[j]))
Asm += " ";
switch (AsmToks[j].getKind()) {
default:
//llvm_unreachable("Unknown token.");
break;
case tok::comma: Asm += ","; break;
case tok::colon: Asm += ":"; break;
case tok::l_square: Asm += "["; break;
case tok::r_square: Asm += "]"; break;
case tok::l_brace: Asm += "{"; break;
case tok::r_brace: Asm += "}"; break;
case tok::numeric_constant: {
SmallString<32> TokenBuf;
TokenBuf.resize(32);
bool StringInvalid = false;
const char *ThisTokBuf = &TokenBuf[0];
unsigned ThisTokLen =
Lexer::getSpelling(AsmToks[j], ThisTokBuf, SemaRef.getSourceManager(),
SemaRef.getLangOpts(), &StringInvalid);
Asm += StringRef(ThisTokBuf, ThisTokLen);
break;
}
case tok::identifier: {
II = AsmToks[j].getIdentifierInfo();
StringRef Name = II->getName();
// Valid registers don't need modification.
if (TI.isValidGCCRegisterName(Name)) {
Asm += Name;
break;
}
// TODO: Lookup the identifier.
IsSimple = false;
}
} // AsmToks[i].getKind()
}
} // AsmToks[i].getKind()
AsmStrings[i] = Asm.c_str();
}
return Res;
}
// Build the unmodified MSAsmString.
@ -2898,11 +2909,14 @@ StmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc,
std::string AsmString = buildMSAsmString(*this, AsmToks, LineEnds);
bool IsSimple;
// Rewrite operands to appease the AsmParser.
std::string PatchedAsmString =
PatchMSAsmString(*this, IsSimple, AsmLoc, AsmToks, Context.getTargetInfo());
std::vector<std::string> PatchedAsmStrings;
PatchedAsmStrings.resize(LineEnds.size());
// PatchMSAsmString doesn't correctly patch non-simple asm statements.
// Rewrite operands to appease the AsmParser.
patchMSAsmStrings(*this, IsSimple, AsmLoc, AsmToks, LineEnds,
Context.getTargetInfo(), PatchedAsmStrings);
// patchMSAsmStrings doesn't correctly patch non-simple asm statements.
if (!IsSimple) {
MSAsmStmt *NS =
new (Context) MSAsmStmt(Context, AsmLoc, /* IsSimple */ true,
@ -2921,29 +2935,32 @@ StmtResult Sema::ActOnMSAsmStmt(SourceLocation AsmLoc,
const std::string &TT = Context.getTargetInfo().getTriple().getTriple();
const llvm::Target *TheTarget(llvm::TargetRegistry::lookupTarget(TT, Error));
llvm::SourceMgr SrcMgr;
llvm::MemoryBuffer *Buffer =
llvm::MemoryBuffer::getMemBuffer(PatchedAsmString, "<inline asm>");
// Tell SrcMgr about this buffer, which is what the parser will pick up.
SrcMgr.AddNewSourceBuffer(Buffer, llvm::SMLoc());
OwningPtr<llvm::MCAsmInfo> MAI(TheTarget->createMCAsmInfo(TT));
OwningPtr<llvm::MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TT));
OwningPtr<llvm::MCObjectFileInfo> MOFI(new llvm::MCObjectFileInfo());
llvm::MCContext Ctx(*MAI, *MRI, MOFI.get(), &SrcMgr);
OwningPtr<llvm::MCSubtargetInfo>
STI(TheTarget->createMCSubtargetInfo(TT, "", ""));
OwningPtr<llvm::MCStreamer> Str;
OwningPtr<llvm::MCAsmParser>
Parser(createMCAsmParser(SrcMgr, Ctx, *Str.get(), *MAI));
OwningPtr<llvm::MCTargetAsmParser>
TargetParser(TheTarget->createMCAsmParser(*STI, *Parser));
for (unsigned i = 0, e = PatchedAsmStrings.size(); i != e; ++i) {
llvm::SourceMgr SrcMgr;
llvm::MCContext Ctx(*MAI, *MRI, MOFI.get(), &SrcMgr);
llvm::MemoryBuffer *Buffer =
llvm::MemoryBuffer::getMemBuffer(PatchedAsmStrings[i], "<inline asm>");
// Change to the Intel dialect.
Parser->setAssemblerDialect(1);
Parser->setTargetParser(*TargetParser.get());
// Tell SrcMgr about this buffer, which is what the parser will pick up.
SrcMgr.AddNewSourceBuffer(Buffer, llvm::SMLoc());
OwningPtr<llvm::MCStreamer> Str;
OwningPtr<llvm::MCAsmParser>
Parser(createMCAsmParser(SrcMgr, Ctx, *Str.get(), *MAI));
OwningPtr<llvm::MCTargetAsmParser>
TargetParser(TheTarget->createMCAsmParser(*STI, *Parser));
// Change to the Intel dialect.
Parser->setAssemblerDialect(1);
Parser->setTargetParser(*TargetParser.get());
// TODO: Start parsing.
}
MSAsmStmt *NS =
new (Context) MSAsmStmt(Context, AsmLoc, IsSimple, /* IsVolatile */ true,

32
clang/test/CodeGen/ms-inline-asm.c
View File

@ -6,3 +6,35 @@ void t1() {
// CHECK: ret void
__asm {}
}
void t2() {
// CHECK: @t2
// CHECK: call void asm sideeffect "nop\0Anop\0Anop", "~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
// CHECK: ret void
__asm nop
__asm nop
__asm nop
}
void t3() {
// CHECK: @t3
// CHECK: call void asm sideeffect "nop\0Anop\0Anop", "~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
// CHECK: ret void
__asm nop __asm nop __asm nop
}
void t4(void) {
// CHECK: @t4
// CHECK: call void asm sideeffect "mov ebx, eax\0Amov ecx, ebx", "~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
// CHECK: ret void
__asm mov ebx, eax
__asm mov ecx, ebx
}
void t5(void) {
// CHECK: @t5
// CHECK: call void asm sideeffect "mov ebx, eax\0Amov ecx, ebx", "~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
// CHECK: ret void
__asm mov ebx, eax __asm mov ecx, ebx
}