130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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/*
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Upcalls
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These are runtime functions that the compiler knows about and generates
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calls to. They are called on the Rust stack and, in most cases, immediately
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switch to the C stack.
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*/
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#include "rust_globals.h"
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#include "rust_util.h"
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//Unwinding ABI declarations.
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typedef int _Unwind_Reason_Code;
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typedef int _Unwind_Action;
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struct _Unwind_Context;
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struct _Unwind_Exception;
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typedef void (*CDECL stack_switch_shim)(void*);
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/**********************************************************************
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* Switches to the C-stack and invokes |fn_ptr|, passing |args| as argument.
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* This is used by the C compiler to call foreign functions and by other
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* upcalls to switch to the C stack. The return value is passed through a
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* field in the args parameter. This upcall is specifically for switching
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* to the shim functions generated by rustc.
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*/
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extern "C" CDECL void
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upcall_call_shim_on_c_stack(void *args, void *fn_ptr) {
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stack_switch_shim f = (stack_switch_shim)fn_ptr;
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f(args);
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}
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/*
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* The opposite of above. Starts on a C stack and switches to the Rust
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* stack. This is the only upcall that runs from the C stack.
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*/
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extern "C" CDECL void
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upcall_call_shim_on_rust_stack(void *args, void *fn_ptr) {
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// There's no task. Call the function and hope for the best
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stack_switch_shim f = (stack_switch_shim)fn_ptr;
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f(args);
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}
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/**********************************************************************/
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extern "C" _Unwind_Reason_Code
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__gxx_personality_v0(int version,
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_Unwind_Action actions,
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uint64_t exception_class,
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_Unwind_Exception *ue_header,
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_Unwind_Context *context);
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struct s_rust_personality_args {
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_Unwind_Reason_Code retval;
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int version;
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_Unwind_Action actions;
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uint64_t exception_class;
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_Unwind_Exception *ue_header;
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_Unwind_Context *context;
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};
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extern "C" void
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upcall_s_rust_personality(s_rust_personality_args *args) {
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args->retval = __gxx_personality_v0(args->version,
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args->actions,
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args->exception_class,
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args->ue_header,
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args->context);
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}
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/**
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The exception handling personality function. It figures
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out what to do with each landing pad. Just a stack-switching
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wrapper around the C++ personality function.
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*/
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extern "C" _Unwind_Reason_Code
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upcall_rust_personality(int version,
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_Unwind_Action actions,
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uint64_t exception_class,
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_Unwind_Exception *ue_header,
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_Unwind_Context *context) {
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s_rust_personality_args args = {(_Unwind_Reason_Code)0,
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version, actions, exception_class,
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ue_header, context};
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upcall_s_rust_personality(&args);
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return args.retval;
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}
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// NB: This needs to be blazing fast. Don't switch stacks
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extern "C" CDECL void *
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upcall_new_stack(size_t stk_sz, void *args_addr, size_t args_sz) {
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assert(false && "newsched shouldn't be growing the stack");
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return NULL;
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}
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// NB: This needs to be blazing fast. Don't switch stacks
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extern "C" CDECL void
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upcall_del_stack() {
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assert(false && "newsched shouldn't be growing the stack");
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}
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// Landing pads need to call this to insert the
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// correct limit into TLS.
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// NB: This must run on the Rust stack because it
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// needs to acquire the value of the stack pointer
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extern "C" CDECL void
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upcall_reset_stack_limit() {
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}
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//
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// Local Variables:
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// mode: C++
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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