[mips] Added support for using traps and breaks in the integrated assembler via command line options.

[s.egerton]

Summary

The command line options for these are -Wa,--trap and -Wa,--break.

[dsanders]

LGTM but note that one of the spellings (e.g. 'use-div-traps') will need updating to match the changes made to the other patch.

[s.egerton]

Changed all references to "use-div-traps" to "use-tcc-in-div" to relect changes made to the llvm integrated assember in a different patch (http://reviews.llvm.org/D11675).

[s.egerton]

Fixed spacing issues.

lib/Driver/Tools.cpp

for (const StringRef Value : A->getValues()) {
         // -I. The next arg will be the include directory.
         if (Value == "-I")
           TakeNextArg = true;
       } else if (Value.startswith("-gdwarf-")) {
         CmdArgs.push_back(Value.data());
       } else if (Value.startswith("-mcpu") || Value.startswith("-mfpu") ||
                  Value.startswith("-mhwdiv") || Value.startswith("-march")) {
         // Do nothing, we'll validate it later.
+      } else if (Value == "--trap") {
+         CmdArgs.push_back("-target-feature");
+         CmdArgs.push_back("+use-div-traps");
+      } else if (Value == "--break") {
+         CmdArgs.push_back("-target-feature");
+         CmdArgs.push_back("-use-div-traps");
       } else {
         D.Diag(diag::err_drv_unsupported_option_argument)
             << A->getOption().getName() << Value;
       }
     }
   }
   if (CompressDebugSections) {
     if (llvm::zlib::isAvailable())

test/Driver/mips-ias-Wa.s

+// RUN: %clang -target mips-linux-gnu -### -fintegrated-as -c %s 2>&1 | \
+// RUN:   FileCheck -check-prefix=TRAP-DEFAULT %s
+// TRAP-DEFAULT: -cc1as
+// TRAP-DEFAULT-NOT: "-target-feature" "-use-div-traps"
+
+// RUN: %clang -target mips-linux-gnu -### -fintegrated-as -c %s -Wa,--trap 2>&1 | \
+// RUN:   FileCheck -check-prefix=TRAP-ON %s
+// TRAP-ON: -cc1as
+// TRAP-ON: "-target-feature" "+use-div-traps"
+
+// RUN: %clang -target mips-linux-gnu -### -fintegrated-as -c %s -Wa,--break 2>&1 | \
+// RUN:   FileCheck -check-prefix=TRAP-OFF %s
+// TRAP-OFF: -cc1as
+// TRAP-OFF: "-target-feature" "-use-div-traps
+
+// RUN: %clang -target mips-linux-gnu -### -fintegrated-as -c %s -Wa,--trap,--break 2>&1 | \
+// RUN:   FileCheck -check-prefix=TRAP-BOTH-TRAP-FIRST %s
+// TRAP-BOTH-TRAP-FIRST: -cc1as
+// TRAP-BOTH-TRAP-FIRST: "-target-feature" "+use-div-traps" "-target-feature" "-use-div-traps"
+
+// RUN: %clang -target mips-linux-gnu -### -fintegrated-as -c %s -Wa,--break,--trap 2>&1 | \
+// RUN:   FileCheck -check-prefix=TRAP-BOTH-BREAK-FIRST %s
+// TRAP-BOTH-BREAK-FIRST: -cc1as
+// TRAP-BOTH-BREAK-FIRST: "-target-feature" "-use-div-traps" "-target-feature" "+use-div-traps"