1 files changed, 66 insertions, 0 deletions
diff --git a/byterun/fix_code.c b/byterun/fix_code.c
new file mode 100644
index 000000000..9c24de180
--- /dev/null
+++ b/byterun/fix_code.c
@@ -0,0 +1,66 @@
+/* Translate a block of bytecode (endianness switch, threading). */
+
+#include "config.h"
+#include "fix_code.h"
+#include "misc.h"
+#include "mlvalues.h"
+#include "instruct.h"
+#include "reverse.h"
+
+/* This code is needed only if the processor is big endian */
+
+#ifdef BIG_ENDIAN
+
+void fixup_endianness(code, len)
+     code_t code;
+     asize_t len;
+{
+  code_t p;
+  len /= sizeof(opcode_t);
+  for (p = code; p < code + len; p++) {
+    Reverse_int32(p);
+  }
+}
+
+#endif
+
+/* This code is needed only if we're using threaded code */
+
+#ifdef THREADED_CODE
+
+void thread_code(code, len, instr_table)
+     code_t code;
+     asize_t len;
+     void * instr_table[];
+{
+  code_t p;
+  len /= sizeof(opcode_t);
+  for (p = code; p < code + len; /*nothing*/) {
+    opcode_t instr = *p;
+    Assert(instr >= 0 && instr <= STOP);
+    *p++ = (opcode_t)((unsigned long)(instr_table[instr]));
+    switch(instr) {
+      /* Instructions with one operand */
+    case PUSHACC: case ACC: case POP: case ASSIGN:
+    case PUSHENVACC: case ENVACC: case PUSH_RETADDR: case APPLY:
+    case APPTERM1: case APPTERM2: case APPTERM3: case RETURN:
+    case GRAB: case PUSHGETGLOBAL: case GETGLOBAL: case SETGLOBAL:
+    case PUSHATOM: case ATOM: case MAKEBLOCK1: case MAKEBLOCK2:
+    case MAKEBLOCK3: case GETFIELD: case SETFIELD: case DUMMY:
+    case BRANCH: case BRANCHIF: case BRANCHIFNOT: case PUSHTRAP:
+    case C_CALL1: case C_CALL2: case C_CALL3: case C_CALL4:
+    case CONSTINT: case PUSHCONSTINT: case OFFSETINT: case OFFSETREF:
+      p += 1; break;
+      /* Instructions with two operands */
+    case APPTERM: case CLOSURE: case CLOSUREREC: case PUSHGETGLOBALFIELD:
+    case GETGLOBALFIELD: case MAKEBLOCK: case C_CALLN:
+      p += 2; break;
+      /* Instructions with N+1 operands */
+    case SWITCH: case TRANSLATE:
+      p += *p + 1; break;
+    }
+  }
+  Assert(p = code + len);
+}
+
+#endif