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Hook up error propagation

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This commit is contained in:
Lachlan Sneff
2019-04-22 15:06:40 -07:00
parent a42b7d3815
commit 706ddabf61
13 changed files with 185 additions and 124 deletions
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47
lib/clif-backend/src/signal/unix.rs
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@ -10,7 +10,7 @@
//! unless you have memory unsafety elsewhere in your code.
//!
use crate::relocation::{TrapCode, TrapData};
use crate::signal::HandlerData;
use crate::signal::{HandlerData, RunErr};
use libc::{c_int, c_void, siginfo_t};
use nix::sys::signal::{
sigaction, SaFlags, SigAction, SigHandler, SigSet, Signal, SIGBUS, SIGFPE, SIGILL, SIGSEGV,
@ -18,7 +18,7 @@ use nix::sys::signal::{
use std::cell::{Cell, UnsafeCell};
use std::ptr;
use std::sync::Once;
use wasmer_runtime_core::error::{RuntimeError, RuntimeResult};
use wasmer_runtime_core::typed_func::WasmTrapInfo;
extern "C" fn signal_trap_handler(
signum: ::nix::libc::c_int,
@ -62,7 +62,7 @@ pub unsafe fn trigger_trap() -> ! {
longjmp(jmp_buf as *mut c_void, 0)
}
pub fn call_protected<T>(handler_data: &HandlerData, f: impl FnOnce() -> T) -> RuntimeResult<T> {
pub fn call_protected<T>(handler_data: &HandlerData, f: impl FnOnce() -> T) -> Result<T, RunErr> {
unsafe {
let jmp_buf = SETJMP_BUFFER.with(|buf| buf.get());
let prev_jmp_buf = *jmp_buf;
@ -76,7 +76,7 @@ pub fn call_protected<T>(handler_data: &HandlerData, f: impl FnOnce() -> T) -> R
*jmp_buf = prev_jmp_buf;
if let Some(data) = super::TRAP_EARLY_DATA.with(|cell| cell.replace(None)) {
Err(RuntimeError::Error { data })
Err(RunErr::Error(data))
} else {
let (faulting_addr, inst_ptr) = CAUGHT_ADDRESSES.with(|cell| cell.get());
@ -85,33 +85,18 @@ pub fn call_protected<T>(handler_data: &HandlerData, f: impl FnOnce() -> T) -> R
srcloc: _,
}) = handler_data.lookup(inst_ptr)
{
Err(match Signal::from_c_int(signum) {
Err(RunErr::Trap(match Signal::from_c_int(signum) {
Ok(SIGILL) => match trapcode {
TrapCode::BadSignature => RuntimeError::Trap {
msg: "incorrect call_indirect signature".into(),
},
TrapCode::IndirectCallToNull => RuntimeError::Trap {
msg: "indirect call to null".into(),
},
TrapCode::HeapOutOfBounds => RuntimeError::Trap {
msg: "memory out-of-bounds access".into(),
},
TrapCode::TableOutOfBounds => RuntimeError::Trap {
msg: "table out-of-bounds access".into(),
},
_ => RuntimeError::Trap {
msg: "unknown trap".into(),
},
},
Ok(SIGSEGV) | Ok(SIGBUS) => RuntimeError::Trap {
msg: "memory out-of-bounds access".into(),
},
Ok(SIGFPE) => RuntimeError::Trap {
msg: "illegal arithmetic operation".into(),
TrapCode::BadSignature => WasmTrapInfo::IncorrectCallIndirectSignature,
TrapCode::IndirectCallToNull => WasmTrapInfo::CallIndirectOOB,
TrapCode::HeapOutOfBounds => WasmTrapInfo::MemoryOutOfBounds,
TrapCode::TableOutOfBounds => WasmTrapInfo::CallIndirectOOB,
_ => WasmTrapInfo::Unknown,
},
Ok(SIGSEGV) | Ok(SIGBUS) => WasmTrapInfo::MemoryOutOfBounds,
Ok(SIGFPE) => WasmTrapInfo::IllegalArithmetic,
_ => unimplemented!(),
}
.into())
}))
} else {
let signal = match Signal::from_c_int(signum) {
Ok(SIGFPE) => "floating-point exception",
@ -122,10 +107,8 @@ pub fn call_protected<T>(handler_data: &HandlerData, f: impl FnOnce() -> T) -> R
_ => "unkown trapped signal",
};
// When the trap-handler is fully implemented, this will return more information.
Err(RuntimeError::Trap {
msg: format!("unknown trap at {:p} - {}", faulting_addr, signal).into(),
}
.into())
let s = format!("unknown trap at {:p} - {}", faulting_addr, signal);
Err(RunErr::Error(Box::new(s)))
}
}
} else {