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From 53992f129f04f935da78a9edbe3b15ad9ed12e29 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Wed, 23 Sep 2026 14:33:27 +0100
Subject: [PATCH] bmalloc: enable libpas on Linux/RISCV64
bmalloc's BPlatform.h enabled the libpas-backed bmalloc only on a
small allow-list of 64-bit Linux architectures (X86_64 and ARM64).
RISCV64 was missing from that list, so LIBPAS_ENABLED ended up 0 and
the inline allocator entry points bmalloc_*_inline (declared inside
'#if LIBPAS_ENABLED' in bmalloc_heap_inlines.h) were not available.
JSC consumers - e.g. StructureAlignedMemoryAllocator.cpp calling
bmalloc_try_allocate_auxiliary_with_alignment_inline /
bmalloc_deallocate_inline - then fail to compile with "was not
declared in this scope".
RISCV64 is just another 64-bit Linux target as far as libpas is
concerned, so:
* Add a BCPU(RISCV64) macro alongside the existing BCPU(X86_64) /
BCPU(ARM64) definitions, gated on __riscv && __riscv_xlen == 64.
* Add BCPU(RISCV64) to the BENABLE(LIBPAS) allow-list for Linux.
This is what gives RISCV64 the same libpas-backed bmalloc as the
other supported 64-bit Linux targets.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
Source/bmalloc/bmalloc/BPlatform.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/Source/bmalloc/bmalloc/BPlatform.h
+++ b/Source/bmalloc/bmalloc/BPlatform.h
@@ -176,6 +176,11 @@
#endif
#endif
+/* BCPU(RISCV64) - RISC-V 64-bit */
+#if defined(__riscv) && __riscv_xlen == 64
+#define BCPU_RISCV64 1
+#endif
+
/* BCPU(ARM) - ARM, any version*/
#define BARM_ARCH_AT_LEAST(N) (BCPU(ARM) && BARM_ARCH_VERSION >= N)
@@ -397,7 +402,7 @@
/* BENABLE(LIBPAS) is enabling libpas build. But this does not mean we use libpas for bmalloc replacement. */
#if !defined(BENABLE_LIBPAS)
-#if (!BUSE(MIMALLOC) && !BUSE(SYSTEM_MALLOC)) && BCPU(ADDRESS64) && (BOS(DARWIN) || BOS(WINDOWS) || (BOS(LINUX) && (BCPU(X86_64) || BCPU(ARM64))) || BPLATFORM(PLAYSTATION))
+#if (!BUSE(MIMALLOC) && !BUSE(SYSTEM_MALLOC)) && BCPU(ADDRESS64) && (BOS(DARWIN) || BOS(WINDOWS) || (BOS(LINUX) && (BCPU(X86_64) || BCPU(ARM64) || BCPU(RISCV64))) || BPLATFORM(PLAYSTATION))
#define BENABLE_LIBPAS 1
#ifndef PAS_BMALLOC
#define PAS_BMALLOC 1
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