8253344: Remove unimplemented Arguments::check_gc_consistency #240
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r18 should not be used as it is reserved as platform register. Linux is fine with userspace using it, but Windows and also recently macOS ( openjdk/jdk11u-dev#301 (comment) ) are actually using it on the kernel side. The macro assembler uses the bit pattern `0x7fffffff` (== `r0-r30`) to specify which registers to spill; fortunately this helper is only used here: https://github.com/openjdk/jdk/blob/c05dc268acaf87236f30cf700ea3ac778e3b20e5/src/hotspot/cpu/aarch64/templateInterpreterGenerator_aarch64.cpp#L1400-L1404 I haven't seen causing this particular instance any issues in practice _yet_, presumably because it looks hard to align the stars in order to trigger a problem (between stp and ldp of r18 a transition to kernel space must happen *and* the kernel needs to do something with r18). But jdk11u-dev has more usages of the `::pusha`/`::popa` macro and that causes troubles as explained in the link above. Output of `-XX:+PrintInterpreter` before this change: ``` ---------------------------------------------------------------------- method entry point (kind = native) [0x0000000138809b00, 0x000000013880a280] 1920 bytes -------------------------------------------------------------------------------- 0x0000000138809b00: ldr x2, [x12, #16] 0x0000000138809b04: ldrh w2, [x2, #44] 0x0000000138809b08: add x24, x20, x2, uxtx #3 0x0000000138809b0c: sub x24, x24, #0x8 [...] 0x0000000138809fa4: stp x16, x17, [sp, #128] 0x0000000138809fa8: stp x18, x19, [sp, #144] 0x0000000138809fac: stp x20, x21, [sp, #160] [...] 0x0000000138809fc0: stp x30, xzr, [sp, #240] 0x0000000138809fc4: mov x0, x28 ;; 0x10864ACCC 0x0000000138809fc8: mov x9, #0xaccc // #44236 0x0000000138809fcc: movk x9, #0x864, lsl #16 0x0000000138809fd0: movk x9, #0x1, lsl #32 0x0000000138809fd4: blr x9 0x0000000138809fd8: ldp x2, x3, [sp, #16] [...] 0x0000000138809ff4: ldp x16, x17, [sp, #128] 0x0000000138809ff8: ldp x18, x19, [sp, #144] 0x0000000138809ffc: ldp x20, x21, [sp, #160] ``` After: ``` ---------------------------------------------------------------------- method entry point (kind = native) [0x0000000108e4db00, 0x0000000108e4e280] 1920 bytes -------------------------------------------------------------------------------- 0x0000000108e4db00: ldr x2, [x12, #16] 0x0000000108e4db04: ldrh w2, [x2, #44] 0x0000000108e4db08: add x24, x20, x2, uxtx #3 0x0000000108e4db0c: sub x24, x24, #0x8 [...] 0x0000000108e4dfa4: stp x16, x17, [sp, #128] 0x0000000108e4dfa8: stp x19, x20, [sp, #144] 0x0000000108e4dfac: stp x21, x22, [sp, #160] [...] 0x0000000108e4dfbc: stp x29, x30, [sp, #224] 0x0000000108e4dfc0: mov x0, x28 ;; 0x107E4A06C 0x0000000108e4dfc4: mov x9, #0xa06c // #41068 0x0000000108e4dfc8: movk x9, #0x7e4, lsl #16 0x0000000108e4dfcc: movk x9, #0x1, lsl #32 0x0000000108e4dfd0: blr x9 0x0000000108e4dfd4: ldp x2, x3, [sp, #16] [...] 0x0000000108e4dff0: ldp x16, x17, [sp, #128] 0x0000000108e4dff4: ldp x19, x20, [sp, #144] 0x0000000108e4dff8: ldp x21, x22, [sp, #160] [...] ```
Looks like a leftover from JDK-8199925 that removed the definition, but left the declaration back.
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$ git fetch https://git.openjdk.java.net/jdk pull/240/head:pull/240$ git checkout pull/240