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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
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@ -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;