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ARM: Add pcall() and xpcall() fast functions and unwinders.

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This commit is contained in:
Mike Pall 2011-04-05 00:23:05 +02:00
parent 959683c77c
commit 43d7db62d1
1 changed files with 45 additions and 6 deletions
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51
src/buildvm_arm.dasc
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@ -290,14 +290,34 @@ static void build_subroutines(BuildCtx *ctx)
| b <2
|
|->vm_unwind_c: // Unwind C stack, return from vm_pcall.
| NYI
| // (void *cframe, int errcode)
| mov sp, CARG1
| mov CRET1, CARG2
|->vm_unwind_c_eh: // Landing pad for external unwinder.
| NYI
| ldr L, SAVE_L
| mv_vmstate CARG4, C
| ldr GL:CARG3, L->glref
| str CARG4, GL:CARG3->vmstate
| b ->vm_leave_unw
|
|->vm_unwind_ff: // Unwind C stack, return from ff pcall.
| NYI
| // (void *cframe)
| bic sp, CARG1, #~CFRAME_RAWMASK
|->vm_unwind_ff_eh: // Landing pad for external unwinder.
| NYI
| ldr L, SAVE_L
| mov MASKR8, #255
| mov RC, #16 // 2 results: false + error message.
| lsl MASKR8, MASKR8, #3 // MASKR8 = 255*8.
| ldr BASE, L->base
| ldr DISPATCH, L->glref // Setup pointer to dispatch table.
| mvn CARG1, #~LJ_TFALSE
| sub RA, BASE, #8 // Results start at BASE-8.
| ldr PC, [BASE, FRAME_PC] // Fetch PC of previous frame.
| add DISPATCH, DISPATCH, #GG_G2DISP
| mv_vmstate CARG2, INTERP
| str CARG1, [BASE, #-4] // Prepend false to error message.
| st_vmstate CARG2
| b ->vm_returnc
|
|//-----------------------------------------------------------------------
|//-- Grow stack for calls -----------------------------------------------
@ -688,10 +708,29 @@ static void build_subroutines(BuildCtx *ctx)
|//-- Base library: catch errors ----------------------------------------
|
|.ffunc pcall
| NYI
| ldrb RA, [DISPATCH, #DISPATCH_GL(hookmask)]
| cmp NARGS8:RC, #8
| blo ->fff_fallback
| tst RA, #HOOK_ACTIVE // Remember active hook before pcall.
| mov RB, BASE
| add BASE, BASE, #8
| moveq PC, #8+FRAME_PCALL
| movne PC, #8+FRAME_PCALLH
| sub NARGS8:RC, NARGS8:RC, #8
| b ->vm_call_dispatch
|
|.ffunc_2 xpcall
| NYI
| ldrb RA, [DISPATCH, #DISPATCH_GL(hookmask)]
| checkfunc CARG4, ->fff_fallback // Traceback must be a function.
| mov RB, BASE
| strd CARG12, [BASE, #8] // Swap function and traceback.
| strd CARG34, [BASE]
| tst RA, #HOOK_ACTIVE // Remember active hook before pcall.
| add BASE, BASE, #16
| moveq PC, #16+FRAME_PCALL
| movne PC, #16+FRAME_PCALLH
| sub NARGS8:RC, NARGS8:RC, #16
| b ->vm_call_dispatch
|
|//-- Coroutine library --------------------------------------------------
|