void
wasm::ToggleProfiling(const Code& code, const CallSite& callSite, bool enabled)
{
if (callSite.kind() != CallSite::FuncDef)
return;
uint8_t* callerRetAddr = code.segment().base() + callSite.returnAddressOffset();
#if defined(JS_CODEGEN_X86) || defined(JS_CODEGEN_X64)
void* callee = X86Encoding::GetRel32Target(callerRetAddr);
#elif defined(JS_CODEGEN_ARM)
uint8_t* caller = callerRetAddr - 4;
Instruction* callerInsn = reinterpret_cast<Instruction*>(caller);
BOffImm calleeOffset;
callerInsn->as<InstBLImm>()->extractImm(&calleeOffset);
void* callee = calleeOffset.getDest(callerInsn);
#elif defined(JS_CODEGEN_ARM64)
MOZ_CRASH();
void* callee = nullptr;
(void)callerRetAddr;
#elif defined(JS_CODEGEN_MIPS32) || defined(JS_CODEGEN_MIPS64)
uint8_t* caller = callerRetAddr - 2 * sizeof(uint32_t);
InstImm* callerInsn = reinterpret_cast<InstImm*>(caller);
BOffImm16 calleeOffset;
callerInsn->extractImm16(&calleeOffset);
void* callee = calleeOffset.getDest(reinterpret_cast<Instruction*>(caller));
#elif defined(JS_CODEGEN_NONE)
MOZ_CRASH();
void* callee = nullptr;
#else
# error "Missing architecture"
#endif
const CodeRange* codeRange = code.lookupRange(callee);
if (!codeRange->isFunction())
return;
uint8_t* from = code.segment().base() + codeRange->funcNonProfilingEntry();
uint8_t* to = code.segment().base() + codeRange->funcProfilingEntry();
if (!enabled)
Swap(from, to);
MOZ_ASSERT(callee == from);
#if defined(JS_CODEGEN_X86) || defined(JS_CODEGEN_X64)
X86Encoding::SetRel32(callerRetAddr, to);
#elif defined(JS_CODEGEN_ARM)
new (caller) InstBLImm(BOffImm(to - caller), Assembler::Always);
#elif defined(JS_CODEGEN_ARM64)
(void)to;
MOZ_CRASH();
#elif defined(JS_CODEGEN_MIPS32) || defined(JS_CODEGEN_MIPS64)
new (caller) InstImm(op_regimm, zero, rt_bgezal, BOffImm16(to - caller));
#elif defined(JS_CODEGEN_NONE)
MOZ_CRASH();
#else
# error "Missing architecture"
#endif
}
static void
UpdateEntry(const Code& code, bool profilingEnabled, void** entry)
{
const CodeRange& codeRange = *code.lookupRange(*entry);
void* from = code.segment().base() + codeRange.funcNonProfilingEntry();
void* to = code.segment().base() + codeRange.funcProfilingEntry();
if (!profilingEnabled)
Swap(from, to);
MOZ_ASSERT(*entry == from);
*entry = to;
}
static inline void
AssertMatchesCallSite(const WasmActivation& activation, void* callerPC, void* callerFP, void* fp)
{
#ifdef DEBUG
Code* code = activation.compartment()->wasm.lookupCode(callerPC);
MOZ_ASSERT(code);
const CodeRange* callerCodeRange = code->lookupRange(callerPC);
MOZ_ASSERT(callerCodeRange);
if (callerCodeRange->kind() == CodeRange::Entry) {
MOZ_ASSERT(callerFP == nullptr);
return;
}
const CallSite* callsite = code->lookupCallSite(callerPC);
MOZ_ASSERT(callsite);
MOZ_ASSERT(callerFP == (uint8_t*)fp + callsite->stackDepth());
#endif
}
