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Bug 1147371: Implement JSOP_PICK and JSOP_UNPICK in the expression decompiler

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Issue #74
This commit is contained in:
janekptacijarabaci 2018-03-24 12:28:12 +01:00 • committed by Roy Tam
commit 0f625eb5bd
3 changed files with 31 additions and 1 deletions
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28
js/src/jsopcode.cpp
View file

@ -460,6 +460,34 @@ BytecodeParser::simulateOp(JSOp op, uint32_t offset, uint32_t* offsetStack, uint
offsetStack[stackDepth] = tmp;
}
break;
case JSOP_PICK: {
jsbytecode* pc = script_->offsetToPC(offset);
unsigned n = GET_UINT8(pc);
MOZ_ASSERT(ndefs == n + 1);
if (offsetStack) {
uint32_t top = stackDepth + n;
uint32_t tmp = offsetStack[stackDepth];
for (uint32_t i = stackDepth; i < top; i++)
offsetStack[i] = offsetStack[i + 1];
offsetStack[top] = tmp;
}
break;
}
case JSOP_UNPICK: {
jsbytecode* pc = script_->offsetToPC(offset);
unsigned n = GET_UINT8(pc);
MOZ_ASSERT(ndefs == n + 1);
if (offsetStack) {
uint32_t top = stackDepth + n;
uint32_t tmp = offsetStack[top];
for (uint32_t i = top; i > stackDepth; i--)
offsetStack[i] = offsetStack[i - 1];
offsetStack[stackDepth] = tmp;
}
break;
}
}
stackDepth += ndefs;
return stackDepth;

1
js/src/jsopcode.h
View file

@ -423,6 +423,7 @@ BytecodeFallsThrough(JSOp op)
case JSOP_RETRVAL:
case JSOP_FINALYIELDRVAL:
case JSOP_THROW:
case JSOP_THROWMSG:
case JSOP_TABLESWITCH:
return false;
case JSOP_GOSUB:

3
js/src/jsopcodeinlines.h
View file

@ -27,6 +27,7 @@ GetDefCount(JSScript* script, unsigned offset)
case JSOP_AND:
return 1;
case JSOP_PICK:
case JSOP_UNPICK:
/*
* Pick pops and pushes how deep it looks in the stack + 1
* items. i.e. if the stack were |a b[2] c[1] d[0]|, pick 2
@ -44,7 +45,7 @@ GetUseCount(JSScript* script, unsigned offset)
{
jsbytecode* pc = script->offsetToPC(offset);
if (JSOp(*pc) == JSOP_PICK)
if (JSOp(*pc) == JSOP_PICK || JSOp(*pc) == JSOP_UNPICK)
return pc[1] + 1;
if (CodeSpec[*pc].nuses == -1)
return StackUses(script, pc);