[llvm] [RISCV] Make parseNormalizedArchString only accept [a-z0-9_]. (PR #90815)

[Craig Topper via llvm-commits]

https://github.com/topperc created https://github.com/llvm/llvm-project/pull/90815

Previously we only rejected upper case characters. We should instead reject anything we don't accept. Other characters will likely confuse the extension sorting.

>From 97b747783dfeb61c561a1e49527c36eb6bbacab3 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper at sifive.com>
Date: Wed, 1 May 2024 19:36:12 -0700
Subject: [PATCH] [RISCV] Make parseNormalizedArchString only accept [a-z0-9_].

Previously we only rejected upper case characters. We should instead
reject anything we don't accept. Other characters will likely
confuse the extension sorting.
---
 llvm/lib/TargetParser/RISCVISAInfo.cpp           | 6 ++++--
 llvm/unittests/TargetParser/RISCVISAInfoTest.cpp | 9 +++++----
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/llvm/lib/TargetParser/RISCVISAInfo.cpp b/llvm/lib/TargetParser/RISCVISAInfo.cpp
index e8172ebb259720..6d073f7604b573 100644
--- a/llvm/lib/TargetParser/RISCVISAInfo.cpp
+++ b/llvm/lib/TargetParser/RISCVISAInfo.cpp
@@ -425,9 +425,11 @@ RISCVISAInfo::parseFeatures(unsigned XLen,
 
 llvm::Expected<std::unique_ptr<RISCVISAInfo>>
 RISCVISAInfo::parseNormalizedArchString(StringRef Arch) {
-  if (llvm::any_of(Arch, isupper))
+  // RISC-V ISA strings must be [a-z0-9_]
+  if (!llvm::all_of(
+          Arch, [](char C) { return isDigit(C) || isLower(C) || C == '_'; }))
     return createStringError(errc::invalid_argument,
-                             "string must be lowercase");
+                             "string may only contain [a-z0-9_]");
 
   // Must start with a valid base ISA name.
   unsigned XLen = 0;
diff --git a/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp b/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp
index 3aa0178100abf4..4f561cd423a27f 100644
--- a/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp
+++ b/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp
@@ -21,10 +21,11 @@ bool operator==(const RISCVISAUtils::ExtensionVersion &A,
 }
 
 TEST(ParseNormalizedArchString, RejectsUpperCase) {
-  for (StringRef Input : {"RV32", "rV64", "rv32i2P0", "rv64i2p0_A2p0"}) {
+  for (StringRef Input :
+       {"RV32", "rV64", "rv32i2P0", "rv64i2p0_A2p0", "rv32e2.0"}) {
     EXPECT_EQ(
         toString(RISCVISAInfo::parseNormalizedArchString(Input).takeError()),
-        "string must be lowercase");
+        "string may only contain [a-z0-9_]");
   }
 }
 
@@ -37,8 +38,8 @@ TEST(ParseNormalizedArchString, RejectsInvalidBaseISA) {
 }
 
 TEST(ParseNormalizedArchString, RejectsMalformedInputs) {
-  for (StringRef Input : {"rv64i2p0_", "rv32i2p0__a2p0", "rv32e2.0", "rv64e2p",
-                          "rv32i", "rv64ip1"}) {
+  for (StringRef Input :
+       {"rv64i2p0_", "rv32i2p0__a2p0", "rv64e2p", "rv32i", "rv64ip1"}) {
     EXPECT_EQ(
         toString(RISCVISAInfo::parseNormalizedArchString(Input).takeError()),
         "extension lacks version in expected format");