1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/jit/Disassemble.cpp b/js/src/jit/Disassemble.cpp
index 652c381ce7..df768d4fd1 100644
--- a/js/src/jit/Disassemble.cpp
+++ b/js/src/jit/Disassemble.cpp
@@ -22,6 +22,8 @@
 #    include "jit/arm64/vixl/Instructions-vixl.h"  // vixl::Instruction
 #  elif defined(JS_CODEGEN_ARM)
 #    include "jit/arm/disasm/Disasm-arm.h"  // js::jit::disasm::*
+#  elif defined(JS_CODEGEN_RISCV64)
+#    include "jit/riscv64/disasm/Disasm-riscv64.h"  // js::jit::disasm::*
 #  endif
 #endif
 
@@ -99,6 +101,31 @@ void Disassemble(uint8_t* code, size_t length, InstrCallback callback) {
   }
 }
 
+#elif defined(JS_JITSPEW) && defined(JS_CODEGEN_RISCV64)
+
+bool HasDisassembler() { return true; }
+
+void Disassemble(uint8_t* code, size_t length, InstrCallback callback) {
+  disasm::NameConverter converter;
+  disasm::Disassembler d(converter);
+
+  uint8_t* instr = code;
+  uint8_t* end = code + length;
+
+  while (instr < end) {
+    EmbeddedVector<char, ReasonableBufferSize> buffer;
+    buffer[0] = '\0';
+    uint8_t* next_instr = instr + d.InstructionDecode(buffer, instr);
+
+    JS::UniqueChars formatted =
+        JS_smprintf("0x%p  %08x  %s", instr, *reinterpret_cast<int32_t*>(instr),
+                    buffer.start());
+    callback(formatted.get());
+
+    instr = next_instr;
+  }
+}
+
 #else
 
 bool HasDisassembler() { return false; }