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[JAEGER] Added JSOP_TABLESWITCH.

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This commit is contained in:
David Anderson 2010-06-10 13:37:37 -07:00
parent f05461c221
commit 48bdd8875c
3 changed files with 59 additions and 0 deletions
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9
js/src/methodjit/Compiler.cpp
View File

@ -727,6 +727,15 @@ mjit::Compiler::generateMethod()
}
END_CASE(JSOP_AND)
BEGIN_CASE(JSOP_TABLESWITCH)
frame.forgetEverything();
masm.move(ImmPtr(PC), Registers::ArgReg1);
stubCall(stubs::TableSwitch, Uses(1), Defs(0));
masm.jump(Registers::ReturnReg);
PC += js_GetVariableBytecodeLength(PC);
break;
END_CASE(JSOP_TABLESWITCH)
BEGIN_CASE(JSOP_LOOKUPSWITCH)
frame.forgetEverything();
masm.move(ImmPtr(PC), Registers::ArgReg1);

49
js/src/methodjit/StubCalls.cpp
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@ -2725,3 +2725,52 @@ stubs::LookupSwitch(VMFrame &f, jsbytecode *pc)
return script->nmap[offs];
}
void * JS_FASTCALL
stubs::TableSwitch(VMFrame &f, jsbytecode *origPc)
{
jsbytecode * const originalPC = origPc;
jsbytecode *pc = originalPC;
JSScript *script = f.fp->script;
uint32 jumpOffset = GET_JUMP_OFFSET(pc);
pc += JUMP_OFFSET_LEN;
/* Note: compiler adjusts the stack beforehand. */
Value rval = f.regs.sp[-1];
jsint tableIdx;
if (rval.isInt32()) {
tableIdx = rval.asInt32();
} else if (rval.isDouble()) {
double d = rval.asDouble();
if (d == 0) {
/* Treat -0 (double) as 0. */
tableIdx = 0;
} else if (!JSDOUBLE_IS_INT32(d, tableIdx)) {
goto finally;
}
} else {
goto finally;
}
{
uint32 low = GET_JUMP_OFFSET(pc);
pc += JUMP_OFFSET_LEN;
uint32 high = GET_JUMP_OFFSET(pc);
pc += JUMP_OFFSET_LEN;
tableIdx -= low;
if ((jsuint) tableIdx < (jsuint)(high - low + 1)) {
pc += JUMP_OFFSET_LEN * tableIdx;
uint32 candidateOffset = GET_JUMP_OFFSET(pc);
if (candidateOffset)
jumpOffset = candidateOffset;
}
}
finally:
/* Provide the native address. */
ptrdiff_t offset = (originalPC + jumpOffset) - script->code;
JS_ASSERT(script->nmap[offset]);
return script->nmap[offset];
}

1
js/src/methodjit/StubCalls.h
View File

@ -63,6 +63,7 @@ void * JS_FASTCALL New(VMFrame &f, uint32 argc);
void * JS_FASTCALL Return(VMFrame &f);
void JS_FASTCALL Throw(VMFrame &f);
void * JS_FASTCALL LookupSwitch(VMFrame &f, jsbytecode *pc);
void * JS_FASTCALL TableSwitch(VMFrame &f, jsbytecode *origPc);
void JS_FASTCALL BindName(VMFrame &f);
void JS_FASTCALL SetName(VMFrame &f, uint32 index);