https://github.com/BeMg created https://github.com/llvm/llvm-project/pull/106495
…isValidFeatureName
This patch makes unsupported target attributes emit a warning and ignore the
target attribute during semantic checks. The changes include:
1. Adding the RISCVTargetInfo::isValidFeatureName function.
2. Adding a '+' sign to __RISCV_TargetAttrNeedOverride because checkTargetAttr
will remove the sign.
3. Rejecting non-full-arch strings in the handleFullArchString function.
4. Adding test cases to demonstrate the warning behavior.
>From 64557cf6950c17a92b6d85980530abe1e193e111 Mon Sep 17 00:00:00 2001
From: Piyou Chen <piyou.c...@sifive.com>
Date: Wed, 28 Aug 2024 21:15:57 -0700
Subject: [PATCH] [Clang][RISCV] Recognize unsupport feature by supporting
isValidFeatureName
---
clang/lib/Basic/Targets/RISCV.cpp | 18 ++++++++++++++++--
clang/lib/Basic/Targets/RISCV.h | 1 +
clang/lib/Sema/SemaDeclAttr.cpp | 15 +++++++++++----
clang/test/Sema/attr-target-riscv.c | 9 +++++++++
4 files changed, 37 insertions(+), 6 deletions(-)
diff --git a/clang/lib/Basic/Targets/RISCV.cpp
b/clang/lib/Basic/Targets/RISCV.cpp
index 1f8a8cd1462c9d..1d6f49ca232692 100644
--- a/clang/lib/Basic/Targets/RISCV.cpp
+++ b/clang/lib/Basic/Targets/RISCV.cpp
@@ -257,7 +257,7 @@ bool RISCVTargetInfo::initFeatureMap(
// If a target attribute specified a full arch string, override all the ISA
// extension target features.
- const auto I = llvm::find(FeaturesVec, "__RISCV_TargetAttrNeedOverride");
+ const auto I = llvm::find(FeaturesVec, "+__RISCV_TargetAttrNeedOverride");
if (I != FeaturesVec.end()) {
std::vector<std::string> OverrideFeatures(std::next(I), FeaturesVec.end());
@@ -391,7 +391,14 @@ void RISCVTargetInfo::fillValidTuneCPUList(
static void handleFullArchString(StringRef FullArchStr,
std::vector<std::string> &Features) {
- Features.push_back("__RISCV_TargetAttrNeedOverride");
+
+ // Should be full arch string.
+ if (!FullArchStr.starts_with("rv")) {
+ Features.push_back(FullArchStr.str());
+ return;
+ }
+
+ Features.push_back("+__RISCV_TargetAttrNeedOverride");
auto RII = llvm::RISCVISAInfo::parseArchString(
FullArchStr, /* EnableExperimentalExtension */ true);
if (llvm::errorToBool(RII.takeError())) {
@@ -485,3 +492,10 @@ bool RISCVTargetInfo::validateCpuSupports(StringRef
Feature) const {
// __riscv_feature_bits structure.
return -1 != llvm::RISCVISAInfo::getRISCVFeaturesBitsInfo(Feature).second;
}
+
+bool RISCVTargetInfo::isValidFeatureName(StringRef Name) const {
+ if (Name == "__RISCV_TargetAttrNeedOverride")
+ return true;
+
+ return llvm::RISCVISAInfo::isSupportedExtensionFeature(Name);
+}
diff --git a/clang/lib/Basic/Targets/RISCV.h b/clang/lib/Basic/Targets/RISCV.h
index 626274b8fc437c..b808ccc8e9cfe9 100644
--- a/clang/lib/Basic/Targets/RISCV.h
+++ b/clang/lib/Basic/Targets/RISCV.h
@@ -130,6 +130,7 @@ class RISCVTargetInfo : public TargetInfo {
bool supportsCpuSupports() const override { return getTriple().isOSLinux(); }
bool supportsCpuInit() const override { return getTriple().isOSLinux(); }
bool validateCpuSupports(StringRef Feature) const override;
+ bool isValidFeatureName(StringRef Name) const override;
};
class LLVM_LIBRARY_VISIBILITY RISCV32TargetInfo : public RISCVTargetInfo {
public:
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 1e074298ac5289..81cff8d7362ad5 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -2993,10 +2993,17 @@ bool Sema::checkTargetAttr(SourceLocation LiteralLoc,
StringRef AttrStr) {
return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
<< Unknown << Tune << ParsedAttrs.Tune << Target;
- if (Context.getTargetInfo().getTriple().isRISCV() &&
- ParsedAttrs.Duplicate != "")
- return Diag(LiteralLoc, diag::err_duplicate_target_attribute)
- << Duplicate << None << ParsedAttrs.Duplicate << Target;
+ if (Context.getTargetInfo().getTriple().isRISCV()) {
+ if (ParsedAttrs.Duplicate != "")
+ return Diag(LiteralLoc, diag::err_duplicate_target_attribute)
+ << Duplicate << None << ParsedAttrs.Duplicate << Target;
+ for (const auto &Feature : ParsedAttrs.Features) {
+ auto CurFeature = StringRef(Feature);
+ if (!CurFeature.starts_with("+") && !CurFeature.starts_with("-"))
+ return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
+ << Unsupported << None << AttrStr << Target;
+ }
+ }
if (ParsedAttrs.Duplicate != "")
return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
diff --git a/clang/test/Sema/attr-target-riscv.c
b/clang/test/Sema/attr-target-riscv.c
index ed4e2915d6c6ef..01d928c1d78e48 100644
--- a/clang/test/Sema/attr-target-riscv.c
+++ b/clang/test/Sema/attr-target-riscv.c
@@ -4,3 +4,12 @@
int __attribute__((target("arch=rv64g"))) foo(void) { return 0; }
//expected-error@+1 {{redefinition of 'foo'}}
int __attribute__((target("arch=rv64gc"))) foo(void) { return 0; }
+
+//expected-warning@+1 {{unsupported 'notafeature' in the 'target' attribute
string; 'target' attribute ignored}}
+int __attribute__((target("arch=+notafeature"))) UnsupportFeature(void) {
return 0; }
+
+//expected-warning@+1 {{unsupported 'arch=+zba,zbb' in the 'target' attribute
string; 'target' attribute ignored}}
+int __attribute__((target("arch=+zba,zbb"))) WithoutAddSigned(void) { return
0; }
+
+//expected-warning@+1 {{unsupported 'arch=zba' in the 'target' attribute
string; 'target' attribute ignored}}
+int __attribute__((target("arch=zba"))) WithoutAddSigned2(void) { return 0; }
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