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[mips] Print warning when using register names not available in N32/64

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Summary:
The register names t4-t7 are not available in the N32 and N64 ABIs.
This patch prints a warning, when those names are used in N32/64,
along with a fix-it with the correct register names.

Patch by Vasileios Kalintiris

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5272


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218989 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Sanders
2014-10-03 15:37:37 +00:00
parent c4d113192d
commit 61bc405795
4 changed files with 58 additions and 3 deletions
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30
lib/Target/Mips/AsmParser/MipsAsmParser.cpp
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@@ -27,6 +27,7 @@
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/SourceMgr.h"
#include <memory>
using namespace llvm;
@@ -101,6 +102,10 @@ class MipsAsmParser : public MCTargetAsmParser {
// selected. This usually happens after an '.end func'
// directive.
// Print a warning along with its fix-it message at the given range.
void printWarningWithFixIt(const Twine &Msg, const Twine &FixMsg,
SMRange Range, bool ShowColors = true);
#define GET_ASSEMBLER_HEADER
#include "MipsGenAsmMatcher.inc"
@@ -1619,6 +1624,14 @@ void MipsAsmParser::warnIfAssemblerTemporary(int RegIndex, SMLoc Loc) {
}
}
void
MipsAsmParser::printWarningWithFixIt(const Twine &Msg, const Twine &FixMsg,
SMRange Range, bool ShowColors) {
getSourceManager().PrintMessage(Range.Start, SourceMgr::DK_Warning, Msg,
{ Range }, { SMFixIt(Range, FixMsg) },
ShowColors);
}
int MipsAsmParser::matchCPURegisterName(StringRef Name) {
int CC;
@@ -1661,6 +1674,23 @@ int MipsAsmParser::matchCPURegisterName(StringRef Name) {
if (!(isABI_N32() || isABI_N64()))
return CC;
if (12 <= CC && CC <= 15) {
// Name is one of t4-t7
AsmToken RegTok = getLexer().peekTok();
SMRange RegRange = RegTok.getLocRange();
StringRef FixedName = StringSwitch<StringRef>(Name)
.Case("t4", "t0")
.Case("t5", "t1")
.Case("t6", "t2")
.Case("t7", "t3")
.Default("");
assert(FixedName != "" && "Register name is not one of t4-t7.");
printWarningWithFixIt("register names $t4-$t7 are only available in O32.",
"Did you mean $" + FixedName + "?", RegRange);
}
// Although SGI documentation just cuts out t0-t3 for n32/n64,
// GNU pushes the values of t0-t3 to override the o32/o64 values for t4-t7
// We are supporting both cases, so for t0-t3 we'll just push them to t4-t7.