+2001-11-03 Geoffrey Keating <geoffk@redhat.com>
+
+ * config/stormy16/stormy16.h (ASM_OUTPUT_MI_THUNK): Call
+ stormy16_asm_output_mi_thunk.
+ * config/stormy16/stormy16.c (stormy16_asm_output_mi_thunk): New
+ function.
+ * config/stormy16/stormy16-protos.h
+ (stormy16_asm_output_mi_thunk): New prototype.
+
2001-11-04 Joseph S. Myers <jsm28@cam.ac.uk>
* ChangeLog.2, ChangeLog.4, ChangeLog.5, ChangeLog,
return gen_rtx_REG (mode, RETURN_VALUE_REGNUM);
}
+/* A C compound statement that outputs the assembler code for a thunk function,
+ used to implement C++ virtual function calls with multiple inheritance. The
+ thunk acts as a wrapper around a virtual function, adjusting the implicit
+ object parameter before handing control off to the real function.
+
+ First, emit code to add the integer DELTA to the location that contains the
+ incoming first argument. Assume that this argument contains a pointer, and
+ is the one used to pass the `this' pointer in C++. This is the incoming
+ argument *before* the function prologue, e.g. `%o0' on a sparc. The
+ addition must preserve the values of all other incoming arguments.
+
+ After the addition, emit code to jump to FUNCTION, which is a
+ `FUNCTION_DECL'. This is a direct pure jump, not a call, and does not touch
+ the return address. Hence returning from FUNCTION will return to whoever
+ called the current `thunk'.
+
+ The effect must be as if @var{function} had been called directly
+ with the adjusted first argument. This macro is responsible for
+ emitting all of the code for a thunk function;
+ TARGET_ASM_FUNCTION_PROLOGUE and TARGET_ASM_FUNCTION_EPILOGUE are
+ not invoked.
+
+ The THUNK_FNDECL is redundant. (DELTA and FUNCTION have already been
+ extracted from it.) It might possibly be useful on some targets, but
+ probably not. */
+
+void
+stormy16_asm_output_mi_thunk (file, thunk_fndecl, delta, function)
+ FILE *file;
+ tree thunk_fndecl ATTRIBUTE_UNUSED;
+ int delta;
+ tree function;
+{
+ int regnum = FIRST_ARGUMENT_REGISTER;
+
+ /* There might be a hidden first argument for a returned structure. */
+ if (aggregate_value_p (TREE_TYPE (TREE_TYPE (function))))
+ regnum += 1;
+
+ fprintf (file, "\tadd %s,#0x%x\n", reg_names[regnum], (delta) & 0xFFFF);
+ fputs ("\tjmpf ", file);
+ assemble_name (file, XSTR (XEXP (DECL_RTL (function), 0), 0));
+ putc ('\n', file);
+}
+
/* Mark functions with SYMBOL_REF_FLAG. */
void
FUNCTION instead of jumping to it. The generic approach does not support
varargs. */
#define ASM_OUTPUT_MI_THUNK(FILE, THUNK_FNDECL, DELTA, FUNCTION) \
-{ \
- fprintf (FILE, "\tadd r2,#0x%x\n", (DELTA) & 0xFFFF); \
- fputs ("\tjmpf ", FILE); \
- assemble_name (FILE, XSTR (XEXP (DECL_RTL (function), 0), 0)); \
- putc ('\n', FILE); \
-}
+ stormy16_asm_output_mi_thunk (FILE, THUNK_FNDECL, DELTA, FUNCTION)
\f
/* Generating Code for Profiling. */