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Add low-overhead profiler. Part 1: interpreter, low-level C API.

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Mike Pall
2013-09-02 01:49:19 +02:00
parent 19c2dd17db
commit 4dce22c40d
18 changed files with 558 additions and 33 deletions
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15
src/vm_x86.dasc
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@@ -2588,7 +2588,7 @@ static void build_subroutines(BuildCtx *ctx)
| mov FCARG2, PC // Caveat: FCARG2 == BASE
| mov FCARG1, L:RB
| // SAVE_PC must hold the _previous_ PC. The callee updates it with PC.
| call extern lj_dispatch_ins@8 // (lua_State *L, BCIns *pc)
| call extern lj_dispatch_ins@8 // (lua_State *L, const BCIns *pc)
|3:
| mov BASE, L:RB->base
|4:
@@ -2658,6 +2658,19 @@ static void build_subroutines(BuildCtx *ctx)
| shr RD, 3
| add NARGS:RD, 1
| jmp RBa
|
|->vm_profhook: // Dispatch target for profiler hook.
#if LJ_HASPROFILE
| mov L:RB, SAVE_L
| mov L:RB->base, BASE
| mov FCARG2, PC // Caveat: FCARG2 == BASE
| mov FCARG1, L:RB
| call extern lj_dispatch_profile@8 // (lua_State *L, const BCIns *pc)
| mov BASE, L:RB->base
| // HOOK_PROFILE is off again, so re-dispatch to dynamic instruction.
| sub PC, 4
| jmp ->cont_nop
#endif
|
|//-----------------------------------------------------------------------
|//-- Trace exit handler -------------------------------------------------