84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
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// vim: set ts=8 sts=2 sw=2 tw=99 et:
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//
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// This file is part of SourcePawn.
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//
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// SourcePawn is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// SourcePawn is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with SourcePawn. If not, see <http://www.gnu.org/licenses/>.
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#ifndef _include_sourcepawn_jit_frames_x86_h_
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#define _include_sourcepawn_jit_frames_x86_h_
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#include <sp_vm_types.h>
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namespace sp {
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using namespace SourcePawn;
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class PluginContext;
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// This is the layout of the stack in between each scripted function call.
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struct JitFrame
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{
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intptr_t align0;
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intptr_t align1;
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ucell_t function_cip;
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void *return_address;
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static inline const JitFrame *FromSp(const intptr_t *sp) {
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return reinterpret_cast<const JitFrame *>(sp);
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}
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};
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// When we're about to call a native, the stack pointer we store in the exit
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// frame is such that (sp + sizeof(JitExitFrameForNative)) conforms to this
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// structure.
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//
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// Note that it looks reversed compared to JitFrame because we capture the sp
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// before saving registers and pushing arguments.
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struct JitExitFrameForNative
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{
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void *return_address;
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PluginContext *cx;
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union {
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uint32_t native_index;
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SPVM_NATIVE_FUNC fn;
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} arg;
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const cell_t *params;
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cell_t saved_alt;
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static inline const JitExitFrameForNative *FromExitSp(const intptr_t *exit_sp) {
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return reinterpret_cast<const JitExitFrameForNative *>(
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reinterpret_cast<const uint8_t *>(exit_sp) - sizeof(JitExitFrameForNative));
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}
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};
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// Unlke native frames, the exit_sp for these is created at the base address.
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struct JitExitFrameForHelper
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{
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void *return_address;
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static inline const JitExitFrameForHelper *FromExitSp(const intptr_t *exit_sp) {
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return reinterpret_cast<const JitExitFrameForHelper *>(exit_sp);
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}
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bool isCompileFunction() const {
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return !!return_address;
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}
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const JitFrame *prev() const {
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return reinterpret_cast<const JitFrame *>(this + 1);
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}
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};
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} // namespace sp
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#endif // _include_sourcepawn_jit_frames_x86_h_
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