Auto merge of #114332 - nbdd0121:riscv, r=compiler-errors

Fix ABI flags in RISC-V/LoongArch ELF file generated by rustc

Fix #114153

It turns out the current way to set these flags are completely wrong. In LLVM the target ABI is used instead of target features to determine these flags.

Not sure how to write a test though. Or maybe a test isn't necessary because this affects only those touching target json?

r? `@Nilstrieb`

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -16,6 +16,7 @@ use rustc_metadata::fs::METADATA_FILENAME;
 use rustc_metadata::EncodedMetadata;
 use rustc_session::cstore::MetadataLoader;
 use rustc_session::Session;
+use rustc_span::sym;
 use rustc_target::abi::Endian;
 use rustc_target::spec::{ef_avr_arch, RelocModel, Target};
 
@@ -272,35 +273,38 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
         Architecture::Riscv32 | Architecture::Riscv64 => {
             // Source: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/079772828bd10933d34121117a222b4cc0ee2200/riscv-elf.adoc
             let mut e_flags: u32 = 0x0;
-            let features = &sess.target.options.features;
+
             // Check if compressed is enabled
-            if features.contains("+c") {
+            // `unstable_target_features` is used here because "c" is gated behind riscv_target_feature.
+            if sess.unstable_target_features.contains(&sym::c) {
                 e_flags |= elf::EF_RISCV_RVC;
             }
 
-            // Select the appropriate floating-point ABI
+            // Set the appropriate flag based on ABI
-            if features.contains("+d") {
+            // This needs to match LLVM `RISCVELFStreamer.cpp`
-                e_flags |= elf::EF_RISCV_FLOAT_ABI_DOUBLE;
+            match &*sess.target.llvm_abiname {
-            } else if features.contains("+f") {
+                "" | "ilp32" | "lp64" => (),
-                e_flags |= elf::EF_RISCV_FLOAT_ABI_SINGLE;
+                "ilp32f" | "lp64f" => e_flags |= elf::EF_RISCV_FLOAT_ABI_SINGLE,
-            } else {
+                "ilp32d" | "lp64d" => e_flags |= elf::EF_RISCV_FLOAT_ABI_DOUBLE,
-                e_flags |= elf::EF_RISCV_FLOAT_ABI_SOFT;
+                "ilp32e" => e_flags |= elf::EF_RISCV_RVE,
+                _ => bug!("unknown RISC-V ABI name"),
             }
+
             e_flags
         }
         Architecture::LoongArch64 => {
             // Source: https://github.com/loongson/la-abi-specs/blob/release/laelf.adoc#e_flags-identifies-abi-type-and-version
             let mut e_flags: u32 = elf::EF_LARCH_OBJABI_V1;
-            let features = &sess.target.options.features;
 
-            // Select the appropriate floating-point ABI
+            // Set the appropriate flag based on ABI
-            if features.contains("+d") {
+            // This needs to match LLVM `LoongArchELFStreamer.cpp`
-                e_flags |= elf::EF_LARCH_ABI_DOUBLE_FLOAT;
+            match &*sess.target.llvm_abiname {
-            } else if features.contains("+f") {
+                "ilp32s" | "lp64s" => e_flags |= elf::EF_LARCH_ABI_SOFT_FLOAT,
-                e_flags |= elf::EF_LARCH_ABI_SINGLE_FLOAT;
+                "ilp32f" | "lp64f" => e_flags |= elf::EF_LARCH_ABI_SINGLE_FLOAT,
-            } else {
+                "ilp32d" | "lp64d" => e_flags |= elf::EF_LARCH_ABI_DOUBLE_FLOAT,
-                e_flags |= elf::EF_LARCH_ABI_SOFT_FLOAT;
+                _ => bug!("unknown RISC-V ABI name"),
             }
+
             e_flags
         }
         Architecture::Avr => {

compiler/rustc_span/src/symbol.rs

@@ -445,6 +445,7 @@ symbols! {
         bridge,
         bswap,
         builtin_syntax,
+        c,
         c_str,
         c_str_literals,
         c_unwind,

tests/ui/or-patterns/missing-bindings.stderr

@@ -79,6 +79,14 @@ LL |     let (A(A(..) | B(a), _) | B(A(a, _) | B(a))) = Y;
    |            |
    |            pattern doesn't bind `a`
 
+error[E0408]: variable `c` is not bound in all patterns
+  --> $DIR/missing-bindings.rs:45:12
+   |
+LL |     let (A(A(a, b) | B(c), d) | B(e)) = Y;
+   |            ^^^^^^^     - variable not in all patterns
+   |            |
+   |            pattern doesn't bind `c`
+
 error[E0408]: variable `a` is not bound in all patterns
   --> $DIR/missing-bindings.rs:45:22
    |
@@ -96,12 +104,12 @@ LL |     let (A(A(a, b) | B(c), d) | B(e)) = Y;
    |                 variable not in all patterns
 
 error[E0408]: variable `c` is not bound in all patterns
-  --> $DIR/missing-bindings.rs:45:12
+  --> $DIR/missing-bindings.rs:45:33
    |
 LL |     let (A(A(a, b) | B(c), d) | B(e)) = Y;
-   |            ^^^^^^^     - variable not in all patterns
+   |                        -        ^^^^ pattern doesn't bind `c`
-   |            |
+   |                        |
-   |            pattern doesn't bind `c`
+   |                        variable not in all patterns
 
 error[E0408]: variable `d` is not bound in all patterns
   --> $DIR/missing-bindings.rs:45:33
@@ -135,14 +143,6 @@ LL |     let (A(A(a, b) | B(c), d) | B(e)) = Y;
    |                 |
    |                 variable not in all patterns
 
-error[E0408]: variable `c` is not bound in all patterns
-  --> $DIR/missing-bindings.rs:45:33
-   |
-LL |     let (A(A(a, b) | B(c), d) | B(e)) = Y;
-   |                        -        ^^^^ pattern doesn't bind `c`
-   |                        |
-   |                        variable not in all patterns
-
 error[E0408]: variable `a` is not bound in all patterns
   --> $DIR/missing-bindings.rs:61:29
    |
@@ -185,6 +185,28 @@ LL |                     B(b),
 LL |                 B(_)
    |                 ^^^^ pattern doesn't bind `b`
 
+error[E0408]: variable `c` is not bound in all patterns
+  --> $DIR/missing-bindings.rs:57:13
+   |
+LL | /             V1(
+LL | |
+LL | |
+LL | |                 A(
+...  |
+LL | |                 B(Ok(a) | Err(a))
+LL | |             ) |
+   | |_____________^ pattern doesn't bind `c`
+LL | /             V2(
+LL | |                 A(
+LL | |                     A(_, a) |
+LL | |                     B(b),
+...  |
+LL | |
+LL | |             ) |
+   | |_____________^ pattern doesn't bind `c`
+LL |               V3(c),
+   |                  - variable not in all patterns
+
 error[E0408]: variable `a` is not bound in all patterns
   --> $DIR/missing-bindings.rs:76:13
    |
@@ -215,28 +237,6 @@ LL |                       B(b),
 LL |               V3(c),
    |               ^^^^^ pattern doesn't bind `b`
 
-error[E0408]: variable `c` is not bound in all patterns
-  --> $DIR/missing-bindings.rs:57:13
-   |
-LL | /             V1(
-LL | |
-LL | |
-LL | |                 A(
-...  |
-LL | |                 B(Ok(a) | Err(a))
-LL | |             ) |
-   | |_____________^ pattern doesn't bind `c`
-LL | /             V2(
-LL | |                 A(
-LL | |                     A(_, a) |
-LL | |                     B(b),
-...  |
-LL | |
-LL | |             ) |
-   | |_____________^ pattern doesn't bind `c`
-LL |               V3(c),
-   |                  - variable not in all patterns
-
 error: aborting due to 26 previous errors
 
 For more information about this error, try `rustc --explain E0408`.

tests/ui/resolve/resolve-inconsistent-names.stderr

@@ -14,6 +14,15 @@ LL |        a | b => {}
    |        |
    |        pattern doesn't bind `b`
 
+error[E0408]: variable `c` is not bound in all patterns
+  --> $DIR/resolve-inconsistent-names.rs:19:9
+   |
+LL |         (A, B) | (ref B, c) | (c, A) => ()
+   |         ^^^^^^           -     - variable not in all patterns
+   |         |                |
+   |         |                variable not in all patterns
+   |         pattern doesn't bind `c`
+
 error[E0408]: variable `A` is not bound in all patterns
   --> $DIR/resolve-inconsistent-names.rs:19:18
    |
@@ -37,15 +46,6 @@ LL |         (A, B) | (ref B, c) | (c, A) => ()
    |             |         variable not in all patterns
    |             variable not in all patterns
 
-error[E0408]: variable `c` is not bound in all patterns
-  --> $DIR/resolve-inconsistent-names.rs:19:9
-   |
-LL |         (A, B) | (ref B, c) | (c, A) => ()
-   |         ^^^^^^           -     - variable not in all patterns
-   |         |                |
-   |         |                variable not in all patterns
-   |         pattern doesn't bind `c`
-
 error[E0409]: variable `B` is bound inconsistently across alternatives separated by `|`
   --> $DIR/resolve-inconsistent-names.rs:19:23
    |

tests/ui/span/issue-39698.stderr

@@ -1,3 +1,13 @@
+error[E0408]: variable `c` is not bound in all patterns
+  --> $DIR/issue-39698.rs:10:9
+   |
+LL |         T::T1(a, d) | T::T2(d, b) | T::T3(c) | T::T4(a) => { println!("{:?}", a); }
+   |         ^^^^^^^^^^^   ^^^^^^^^^^^         -    ^^^^^^^^ pattern doesn't bind `c`
+   |         |             |                   |
+   |         |             |                   variable not in all patterns
+   |         |             pattern doesn't bind `c`
+   |         pattern doesn't bind `c`
+
 error[E0408]: variable `d` is not bound in all patterns
   --> $DIR/issue-39698.rs:10:37
    |
@@ -28,16 +38,6 @@ LL |         T::T1(a, d) | T::T2(d, b) | T::T3(c) | T::T4(a) => { println!("{:?}
    |         |                      variable not in all patterns
    |         pattern doesn't bind `b`
 
-error[E0408]: variable `c` is not bound in all patterns
-  --> $DIR/issue-39698.rs:10:9
-   |
-LL |         T::T1(a, d) | T::T2(d, b) | T::T3(c) | T::T4(a) => { println!("{:?}", a); }
-   |         ^^^^^^^^^^^   ^^^^^^^^^^^         -    ^^^^^^^^ pattern doesn't bind `c`
-   |         |             |                   |
-   |         |             |                   variable not in all patterns
-   |         |             pattern doesn't bind `c`
-   |         pattern doesn't bind `c`
-
 error: aborting due to 4 previous errors
 
 For more information about this error, try `rustc --explain E0408`.