MC/X86 AsmParser: Handle absolute memory operands correctly. We were doing
something totally broken and parsing them as immediates, but the .td file also
had the wrong match class so things sortof worked. Except, that is, that we
would parse
movl $0, %eax
as
movl 0, %eax
Feel free to guess how well that worked.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94869 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/AsmParser/X86AsmParser.cpp b/lib/Target/X86/AsmParser/X86AsmParser.cpp
index cc4498b..65e4981 100644
--- a/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -172,6 +172,11 @@
bool isMem() const { return Kind == Memory; }
+ bool isAbsMem() const {
+ return Kind == Memory && !getMemSegReg() && !getMemBaseReg() &&
+ !getMemIndexReg() && !getMemScale();
+ }
+
bool isNoSegMem() const {
return Kind == Memory && !getMemSegReg();
}
@@ -196,7 +201,6 @@
void addMemOperands(MCInst &Inst, unsigned N) const {
assert((N == 5) && "Invalid number of operands!");
-
Inst.addOperand(MCOperand::CreateReg(getMemBaseReg()));
Inst.addOperand(MCOperand::CreateImm(getMemScale()));
Inst.addOperand(MCOperand::CreateReg(getMemIndexReg()));
@@ -204,9 +208,13 @@
Inst.addOperand(MCOperand::CreateReg(getMemSegReg()));
}
+ void addAbsMemOperands(MCInst &Inst, unsigned N) const {
+ assert((N == 1) && "Invalid number of operands!");
+ Inst.addOperand(MCOperand::CreateExpr(getMemDisp()));
+ }
+
void addNoSegMemOperands(MCInst &Inst, unsigned N) const {
assert((N == 4) && "Invalid number of operands!");
-
Inst.addOperand(MCOperand::CreateReg(getMemBaseReg()));
Inst.addOperand(MCOperand::CreateImm(getMemScale()));
Inst.addOperand(MCOperand::CreateReg(getMemIndexReg()));
@@ -232,10 +240,24 @@
return Res;
}
+ /// Create an absolute memory operand.
+ static X86Operand *CreateMem(const MCExpr *Disp, SMLoc StartLoc,
+ SMLoc EndLoc) {
+ X86Operand *Res = new X86Operand(Memory, StartLoc, EndLoc);
+ Res->Mem.SegReg = 0;
+ Res->Mem.Disp = Disp;
+ Res->Mem.BaseReg = 0;
+ Res->Mem.IndexReg = 0;
+ Res->Mem.Scale = 0;
+ return Res;
+ }
+
+ /// Create a generalized memory operand.
static X86Operand *CreateMem(unsigned SegReg, const MCExpr *Disp,
unsigned BaseReg, unsigned IndexReg,
unsigned Scale, SMLoc StartLoc, SMLoc EndLoc) {
- // We should never just have a displacement, that would be an immediate.
+ // We should never just have a displacement, that should be parsed as an
+ // absolute memory operand.
assert((SegReg || BaseReg || IndexReg) && "Invalid memory operand!");
// The scale should always be one of {1,2,4,8}.
@@ -322,7 +344,7 @@
if (getLexer().isNot(AsmToken::LParen)) {
// Unless we have a segment register, treat this as an immediate.
if (SegReg == 0)
- return X86Operand::CreateImm(Disp, MemStart, ExprEnd);
+ return X86Operand::CreateMem(Disp, MemStart, ExprEnd);
return X86Operand::CreateMem(SegReg, Disp, 0, 0, 1, MemStart, ExprEnd);
}
@@ -349,7 +371,7 @@
if (getLexer().isNot(AsmToken::LParen)) {
// Unless we have a segment register, treat this as an immediate.
if (SegReg == 0)
- return X86Operand::CreateImm(Disp, LParenLoc, ExprEnd);
+ return X86Operand::CreateMem(Disp, LParenLoc, ExprEnd);
return X86Operand::CreateMem(SegReg, Disp, 0, 0, 1, MemStart, ExprEnd);
}
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index 5041263..b6f9e16 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -192,6 +192,10 @@
let Name = "Mem";
let SuperClass = ?;
}
+def X86AbsMemAsmOperand : AsmOperandClass {
+ let Name = "AbsMem";
+ let SuperClass = X86MemAsmOperand;
+}
def X86NoSegMemAsmOperand : AsmOperandClass {
let Name = "NoSegMem";
let SuperClass = X86MemAsmOperand;
@@ -233,7 +237,8 @@
let ParserMatchClass = X86NoSegMemAsmOperand;
}
-let PrintMethod = "print_pcrel_imm" in {
+let ParserMatchClass = X86AbsMemAsmOperand,
+ PrintMethod = "print_pcrel_imm" in {
def i32imm_pcrel : Operand<i32>;
def offset8 : Operand<i64>;