--- /dev/null
+// RUN: not llvm-mc %s 2> %t
+// RUN: FileCheck --input-file %t %s
+
+ .data
+// CHECK: invalid assignment to 't0_v0'
+ t0_v0 = t0_v0 + 1
+
+ t1_v1 = 1
+ t1_v1 = 2
+
+t2_s0:
+// CHECK: redefinition of 't2_s0'
+ t2_s0 = 2
+
+ t3_s0 = t2_s0 + 1
+// CHECK: invalid reassignment of non-absolute variable 't3_s0'
+ t3_s0 = 1
// Eat the end of statement marker.
Lexer.Lex();
- // Diagnose assignment to a label.
- //
- // FIXME: Diagnostics. Note the location of the definition as a label.
+ // Validate that the LHS is allowed to be a variable (either it has not been
+ // used as a symbol, or it is an absolute symbol).
+ MCSymbol *Sym = getContext().LookupSymbol(Name);
+ if (Sym) {
+ // Diagnose assignment to a label.
+ //
+ // FIXME: Diagnostics. Note the location of the definition as a label.
+ // FIXME: Diagnose assignment to protected identifier (e.g., register name).
+ if (!Sym->isUndefined() && !Sym->isAbsolute())
+ return Error(EqualLoc, "redefinition of '" + Name + "'");
+ else if (!Sym->isVariable())
+ return Error(EqualLoc, "invalid assignment to '" + Name + "'");
+ else if (!isa<MCConstantExpr>(Sym->getValue()))
+ return Error(EqualLoc, "invalid reassignment of non-absolute variable '" +
+ Name + "'");
+ } else
+ Sym = CreateSymbol(Name);
+
// FIXME: Handle '.'.
- // FIXME: Diagnose assignment to protected identifier (e.g., register name).
- MCSymbol *Sym = CreateSymbol(Name);
- if (!Sym->isUndefined() && !Sym->isAbsolute())
- return Error(EqualLoc, "symbol has already been defined");
// Do the assignment.
Out.EmitAssignment(Sym, Value);