mirror of
https://github.com/bytecodealliance/wasm-micro-runtime.git
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d381b0fdec
Implement native thread stack overflow check Implement post-MVP: Non-trapping float-to-int conversions Implement post-MVP: Sign-extension operators Enhance WASM loader checks
173 lines
4.2 KiB
C
173 lines
4.2 KiB
C
/*
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* Copyright (C) 2019 Intel Corporation. All rights reserved.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*/
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#ifndef _WASM_EXEC_ENV_H
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#define _WASM_EXEC_ENV_H
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#include "bh_assert.h"
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#if WASM_ENABLE_INTERP != 0
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#include "../interpreter/wasm.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct WASMModuleInstanceCommon;
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struct WASMInterpFrame;
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/* Execution environment */
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typedef struct WASMExecEnv {
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/* Next thread's exec env of a WASM module instance. */
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struct WASMExecEnv *next;
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/* Previous thread's exec env of a WASM module instance. */
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struct WASMExecEnv *prev;
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/* Note: field module_inst, argv_buf and native_stack_boundary
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are used by AOTed code, don't change the places of them */
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/* The WASM module instance of current thread */
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struct WASMModuleInstanceCommon *module_inst;
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#if WASM_ENABLE_AOT != 0
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uint32 *argv_buf;
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#endif
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/* The boundary of native stack. When runtime detects that native
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frame may overrun this boundary, it throws stack overflow
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exception. */
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uint8 *native_stack_boundary;
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/* attachment for native function */
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void *attachment;
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void *user_data;
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/* Current interpreter frame of current thread */
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struct WASMInterpFrame *cur_frame;
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/* The native thread handle of current thread */
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korp_tid handle;
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#if WASM_ENABLE_INTERP != 0
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BlockAddr block_addr_cache[BLOCK_ADDR_CACHE_SIZE][BLOCK_ADDR_CONFLICT_SIZE];
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#endif
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/* The WASM stack size */
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uint32 wasm_stack_size;
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/* The WASM stack of current thread */
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union {
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uint64 __make_it_8_byte_aligned_;
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struct {
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/* The top boundary of the stack. */
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uint8 *top_boundary;
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/* Top cell index which is free. */
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uint8 *top;
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/* The WASM stack. */
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uint8 bottom[1];
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} s;
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} wasm_stack;
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} WASMExecEnv;
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WASMExecEnv *
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wasm_exec_env_create(struct WASMModuleInstanceCommon *module_inst,
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uint32 stack_size);
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void
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wasm_exec_env_destroy(WASMExecEnv *exec_env);
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/**
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* Allocate a WASM frame from the WASM stack.
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*
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* @param exec_env the current execution environment
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* @param size size of the WASM frame, it must be a multiple of 4
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*
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* @return the WASM frame if there is enough space in the stack area
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* with a protection area, NULL otherwise
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*/
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static inline void *
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wasm_exec_env_alloc_wasm_frame(WASMExecEnv *exec_env, unsigned size)
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{
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uint8 *addr = exec_env->wasm_stack.s.top;
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bh_assert(!(size & 3));
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/* The outs area size cannot be larger than the frame size, so
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multiplying by 2 is enough. */
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if (addr + size * 2 > exec_env->wasm_stack.s.top_boundary) {
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/* WASM stack overflow. */
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/* When throwing SOE, the preserved space must be enough. */
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/* bh_assert(!exec_env->throwing_soe);*/
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return NULL;
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}
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exec_env->wasm_stack.s.top += size;
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return addr;
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}
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static inline void
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wasm_exec_env_free_wasm_frame(WASMExecEnv *exec_env, void *prev_top)
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{
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bh_assert((uint8 *)prev_top >= exec_env->wasm_stack.s.bottom);
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exec_env->wasm_stack.s.top = (uint8 *)prev_top;
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}
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/**
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* Get the current WASM stack top pointer.
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*
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* @param exec_env the current execution environment
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*
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* @return the current WASM stack top pointer
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*/
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static inline void*
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wasm_exec_env_wasm_stack_top(WASMExecEnv *exec_env)
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{
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return exec_env->wasm_stack.s.top;
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}
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/**
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* Set the current frame pointer.
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*
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* @param exec_env the current execution environment
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* @param frame the WASM frame to be set for the current exec env
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*/
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static inline void
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wasm_exec_env_set_cur_frame(WASMExecEnv *exec_env,
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struct WASMInterpFrame *frame)
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{
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exec_env->cur_frame = frame;
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}
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/**
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* Get the current frame pointer.
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*
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* @param exec_env the current execution environment
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*
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* @return the current frame pointer
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*/
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static inline struct WASMInterpFrame*
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wasm_exec_env_get_cur_frame(WASMExecEnv *exec_env)
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{
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return exec_env->cur_frame;
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}
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struct WASMModuleInstanceCommon *
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wasm_exec_env_get_module_inst(WASMExecEnv *exec_env);
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void
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wasm_exec_env_set_thread_info(WASMExecEnv *exec_env);
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#ifdef __cplusplus
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}
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#endif
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#endif /* end of _WASM_EXEC_ENV_H */
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