Each delegate call needs to copy its arguments so that they aren't
double-freed by the next call.
Also fix a bug in FT_ASSIGNS where -1 was returned for non-existant
functions instead of 0.
Use `unlikely` (__builtin_expect) to help the compiler optimize error
checks in some hot functions (in my testing, stack_pop_var was one of
the hottest functions, right behind execute_instruction).
This function is not supposed to call destructors, but was calling
heap_unref instead of exit_unref on local pages.
Fixes a bug in Rance VI where the game would crash on game over.
Read .xsys4-debugrc from ~/.xsystem4 and/or the game directory on
startup. This is just a text file with one debugger command per line.
Can be used to set breakpoints or log functions automatically at
startup.
This can also be used to work around a limitation on Windows where the
IME doesn't work in the debugger, making it impossible to input Japanese
text.
Add vm-state command, which prints disassembly around the current
instruction pointer and the current contents of the stack.
It was necessary to change how breakpoints are implemented for this.
When adding a breakpoint, the original opcode now remains in the
instruction stream, bitwise-or'd with BREAKPOINT. A hash table indexed
by address is used to store breakpoint objects.
* Add "frame" command to change the current frame.
* Add "members" command to print struct members for current frame (if it's
a method frame).
* Support printing member variables (e.g. "this.var") in the "print"
command.
1. DG_CALL has to clean up the stack before jumping to the return
address.
2. DG_SET (contrary to its name) is an append operation; it's basically
a combination of DG_NEW_FROM_METHOD and DG_PLUSA.
3. DG_SET and DG_PLUSA need to check for and ignore duplicates.
4. Delegate pages store *references* to structs; the VM should NOT copy
the struct page when copying a delegate page.
Implement:
SH_SASSIGN_STRUCTSREF
SH_SASSIGN_GLOBALSREF
SH_STRUCTSREF_NE_STR0
SH_GLOBALSREF_NE_STR0
SH_LOC_LT_IMM_OR_LOC_GE_IMM
Also, fix an bug in A_EMPTY and SH_IF_STRUCT_A_NOT_EMPTY.
Stack traces now list addresses in addition to function names.
Additionally, debugger stack traces number each frame, and the numbers
can be used together with the PRINT-LOCALS function to print the values
of local variables for any frame on the stack.
This is implemented by inserting special opcodes into the game's code.
When the breakpoint handler is finished, it returns the original opcode
so that execute_instruction can continue executing normally.
E.g.
* start xsystem4 with --debug option to drop into debugger immediately
* run (bp "game_main")
* ^d or \exit to close debugger REPL
* ...drop into a debugger REPL again at the game_main function
kichikuou