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Generate trampolines based on signatures (#947)

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* Generate trampolines based on signatures

Instead of generating a trampoline-per-function generate a
trampoline-per-signature. This should hopefully greatly increase the
cache hit rate on trampolines within a module and avoid generating a
function-per-function.

* Update crates/runtime/src/traphandlers.rs

Co-Authored-By: Sergei Pepyakin <s.pepyakin@gmail.com>

Co-authored-by: Sergei Pepyakin <s.pepyakin@gmail.com>
This commit is contained in:
Alex Crichton
2020-02-18 12:32:52 -06:00
committed by GitHub
parent c94cdc7730
commit 16affacafb
5 changed files with 58 additions and 53 deletions
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11
crates/runtime/signalhandlers/Trampolines.cpp
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@@ -7,7 +7,8 @@ int WasmtimeCallTrampoline(
void **buf_storage,
void *vmctx,
void *caller_vmctx,
void (*body)(void*, void*, void*),
void (*trampoline)(void*, void*, void*, void*),
void *body,
void *args)
{
jmp_buf buf;
@@ -15,12 +16,16 @@ int WasmtimeCallTrampoline(
return 0;
}
*buf_storage = &buf;
body(vmctx, caller_vmctx, args);
trampoline(vmctx, caller_vmctx, body, args);
return 1;
}
extern "C"
int WasmtimeCall(void **buf_storage, void *vmctx, void *caller_vmctx, void (*body)(void*, void*)) {
int WasmtimeCall(
void **buf_storage,
void *vmctx,
void *caller_vmctx,
void (*body)(void*, void*)) {
jmp_buf buf;
if (setjmp(buf) != 0) {
return 0;