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stdlib: Add an offset function for simple pointer arithmetic on unsafe pointers

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This commit is contained in:
Patrick Walton 2011-07-08 21:55:43 -07:00
parent 7498d03693
commit aa0f6f4961
4 changed files with 48 additions and 23 deletions
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8
src/lib/ptr.rs Normal file
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@ -0,0 +1,8 @@
// Unsafe pointer utility functions.
native "rust-intrinsic" mod rusti {
fn ptr_offset[T](*T ptr, uint count) -> *T;
}
fn offset[T](*T ptr, uint count) -> *T { ret rusti::ptr_offset(ptr, count); }

1
src/lib/std.rc
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@ -86,6 +86,7 @@ mod getopts;
mod term;
mod time;
mod smallintmap;
mod ptr;
// Local Variables:
// mode: rust;

9
src/rt/intrinsics/intrinsics.cpp
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@ -1,5 +1,5 @@
// Use `clang++ -emit-llvm -S -arch i386 -O3 -I../isaac -I../uthash
// -I../arch/i386 -o intrinsics.ll intrinsics.cpp`
// -I../arch/i386 -fno-stack-protector -o intrinsics.ll intrinsics.cpp`
#include "../rust_internal.h"
@ -22,3 +22,10 @@ rust_intrinsic_ivec_len(rust_task *task, type_desc *ty, rust_ivec *v)
return fill / ty->size;
}
extern "C" void *
rust_intrinsic_ptr_offset(rust_task *task, type_desc *ty, void *ptr,
uintptr_t count)
{
return &((uint8_t *)ptr)[ty->size * count];
}

53
src/rt/intrinsics/intrinsics.ll.in
View File

@ -4,30 +4,31 @@ target triple = "@CFG_LLVM_TRIPLE@"
%0 = type { i32, i8**, i32 }
%1 = type { i32, %struct.rust_task**, i32 }
%2 = type { %"struct.hash_map<rust_task *, rust_handle<rust_task> *>::map_entry"* }
%3 = type { %"struct.hash_map<rust_port *, rust_handle<rust_port> *>::map_entry"* }
%4 = type { %"struct.hash_map<rust_dom *, rust_handle<rust_dom> *>::map_entry"* }
%2 = type { %"struct.hash_map<rust_port *, rust_handle<rust_port> *>::map_entry"* }
%3 = type { %"struct.hash_map<rust_scheduler *, rust_handle<rust_scheduler> *>::map_entry"* }
%4 = type { i32, %class.rust_task_thread**, i32 }
%5 = type { i32 (...)**, %6 }
%6 = type { i32, %struct.rust_dom**, i32 }
%7 = type { i32 (...)**, %8 }
%8 = type { i32, %class.rust_message_queue**, i32 }
%9 = type opaque
%10 = type opaque
%11 = type { %"struct.hash_map<rust_port *, rust_proxy<rust_port> *>::map_entry"* }
%6 = type { i32, %class.rust_message_queue**, i32 }
%7 = type opaque
%8 = type opaque
%9 = type { %"struct.hash_map<rust_task *, rust_proxy<rust_task> *>::map_entry"* }
%10 = type { %"struct.hash_map<rust_port *, rust_proxy<rust_port> *>::map_entry"* }
%class.array_list = type { i32, %struct.maybe_proxy**, i32 }
%class.context = type { %struct.registers_t, %class.context* }
%class.hash_map = type { %"struct.hash_map<rust_task *, rust_proxy<rust_task> *>::map_entry"* }
%class.hash_map = type { %"struct.hash_map<rust_task *, rust_handle<rust_task> *>::map_entry"* }
%class.indexed_list = type { i32 (...)**, %1 }
%class.lock_and_signal = type { i32 (...)**, %struct._opaque_pthread_cond_t, %struct._opaque_pthread_mutex_t }
%class.lock_and_signal = type { i32 (...)**, %struct._opaque_pthread_cond_t, %struct._opaque_pthread_mutex_t, %struct._opaque_pthread_t*, i8 }
%class.lock_free_queue = type { i32 (...)**, %"struct.lock_free_queue<rust_message *>::pointer_t", %"struct.lock_free_queue<rust_message *>::pointer_t" }
%class.memory_region = type { i32 (...)**, %class.rust_srv*, %class.memory_region*, i32, %0, i8, i8, %class.lock_and_signal }
%class.rust_crate_cache = type { %struct.type_desc*, %struct.rust_dom*, i32 }
%class.rust_crate_cache = type { %struct.type_desc*, %struct.rust_scheduler*, i32 }
%class.rust_handle = type opaque
%class.rust_kernel = type { %class.rust_thread, %class.memory_region*, %class.rust_log, %class.rust_srv*, %2, %3, %4, i8, %class.lock_and_signal, %5, %7 }
%class.rust_log = type { i32 (...)**, %class.rust_srv*, %struct.rust_dom*, i8, i8 }
%class.rust_message_queue = type { %class.lock_free_queue, %class.memory_region, %class.rust_kernel*, %10*, i32 }
%class.rust_srv = type { i32 (...)**, %class.memory_region, %class.memory_region }
%class.rust_task_list = type { %class.indexed_list, %struct.rust_dom*, i8* }
%class.rust_kernel = type { %class.rust_thread, %class.memory_region*, %class.rust_log, %class.rust_srv*, %class.hash_map, %2, %3, i8, %class.lock_and_signal, %4, %struct.rust_scheduler*, %class.lock_and_signal, %5 }
%class.rust_log = type { i32 (...)**, %class.rust_srv*, %struct.rust_scheduler*, i8, i8 }
%class.rust_message_queue = type { %class.lock_free_queue, %class.memory_region, %class.rust_kernel*, %8*, i32 }
%class.rust_srv = type { i32 (...)**, %class.memory_region }
%"class.rust_task::wakeup_callback" = type { i32 (...)** }
%class.rust_task_list = type { %class.indexed_list, %struct.rust_scheduler*, i8* }
%class.rust_task_thread = type { %class.rust_thread, i32, %class.rust_kernel* }
%class.rust_thread = type { i32 (...)**, i8, %struct._opaque_pthread_t* }
%class.timer = type { i32 (...)**, i64, i64 }
%struct.UT_hash_bucket = type { %struct.UT_hash_handle*, i32, i32 }
@ -39,23 +40,22 @@ target triple = "@CFG_LLVM_TRIPLE@"
%struct._opaque_pthread_mutex_t = type { i32, [40 x i8] }
%struct._opaque_pthread_t = type { i32, %struct.__darwin_pthread_handler_rec*, [596 x i8] }
%struct.gc_alloc = type { %struct.gc_alloc*, %struct.gc_alloc*, i32, [0 x i8] }
%"struct.hash_map<rust_dom *, rust_handle<rust_dom> *>::map_entry" = type opaque
%"struct.hash_map<rust_port *, rust_handle<rust_port> *>::map_entry" = type opaque
%"struct.hash_map<rust_port *, rust_proxy<rust_port> *>::map_entry" = type opaque
%"struct.hash_map<rust_scheduler *, rust_handle<rust_scheduler> *>::map_entry" = type opaque
%"struct.hash_map<rust_task *, rust_handle<rust_task> *>::map_entry" = type opaque
%"struct.hash_map<rust_task *, rust_proxy<rust_task> *>::map_entry" = type opaque
%"struct.lock_free_queue<rust_message *>::node_t" = type { %9*, %"struct.lock_free_queue<rust_message *>::pointer_t" }
%"struct.lock_free_queue<rust_message *>::node_t" = type { %7*, %"struct.lock_free_queue<rust_message *>::pointer_t" }
%"struct.lock_free_queue<rust_message *>::pointer_t" = type { %"struct.lock_free_queue<rust_message *>::node_t"*, i32 }
%struct.maybe_proxy = type { %struct.rc_base, %struct.rust_task* }
%struct.randctx = type { i32, [256 x i32], [256 x i32], i32, i32, i32 }
%struct.rc_base = type { i32 }
%struct.registers_t = type { i32, i32, i32, i32, i32, i32, i32, i32, i16, i16, i16, i16, i16, i16, i32, i32 }
%struct.rust_alarm = type { %struct.rust_task*, i32 }
%struct.rust_cond = type { i8 }
%struct.rust_dom = type { %struct.rc_base, i32, %class.rust_log, i32, %class.rust_srv*, %class.memory_region, %class.memory_region, i8*, %class.rust_task_list, %class.rust_task_list, %class.rust_task_list, %class.rust_task_list, %class.rust_crate_cache, %struct.randctx, %struct.rust_task*, %struct.rust_task*, i32, %class.rust_kernel*, i32, %class.hash_map, %11, %class.rust_message_queue*, %struct._opaque_pthread_attr_t }
%struct.rust_ivec = type { i32, i32, %union.rust_ivec_payload }
%struct.rust_ivec_heap = type { i32, [0 x i8] }
%struct.rust_task = type { %struct.maybe_proxy, %struct.stk_seg*, i32, i32, %struct.gc_alloc*, %struct.rust_dom*, %class.rust_crate_cache*, i8*, %class.rust_task_list*, %struct.rust_cond*, i8*, %struct.rust_task*, i32, i32, i32, %class.timer, i32*, %class.array_list, %struct.rust_alarm, %class.rust_handle*, %class.context }
%struct.rust_scheduler = type { %struct.rc_base, i32, %class.rust_log, i32, %class.rust_srv*, i8*, %class.rust_task_list, %class.rust_task_list, %class.rust_task_list, %class.rust_task_list, %class.rust_crate_cache, %struct.randctx, %struct.rust_task*, %struct.rust_task*, i32, %class.rust_kernel*, i32, %9, %10, %class.rust_message_queue*, %struct._opaque_pthread_attr_t }
%struct.rust_task = type { %struct.maybe_proxy, %struct.stk_seg*, i32, i32, %struct.gc_alloc*, %struct.rust_scheduler*, %class.rust_crate_cache*, %class.rust_kernel*, i8*, %class.rust_task_list*, %struct.rust_cond*, i8*, %struct.rust_task*, i32, i32, i32, %class.timer, i32*, %class.array_list, %class.rust_handle*, %class.context, i32, i32, %class.memory_region, %"class.rust_task::wakeup_callback"*, %class.lock_and_signal }
%struct.rust_vec = type { %struct.rc_base, i32, i32, i32, [0 x i8] }
%struct.stk_seg = type { i32, i32, [0 x i8] }
%struct.type_desc = type { %struct.type_desc**, i32, i32, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*)*, i32, void (i8*, %struct.rust_task*, i8*, %struct.type_desc**, i8*, i8*, i8)*, %struct.UT_hash_handle, i32, [0 x %struct.type_desc*] }
@ -97,6 +97,15 @@ if.end17: ; preds = %if.else, %entry, %i
ret i32 %div
}
define linkonce_odr i8* @rust_intrinsic_ptr_offset(%struct.rust_task* nocapture %task, %struct.type_desc* nocapture %ty, i8* %ptr, i32 %count) nounwind readonly {
entry:
%size = getelementptr inbounds %struct.type_desc* %ty, i32 0, i32 1
%tmp1 = load i32* %size, align 4, !tbaa !0
%mul = mul i32 %tmp1, %count
%arrayidx = getelementptr inbounds i8* %ptr, i32 %mul
ret i8* %arrayidx
}
!0 = metadata !{metadata !"long", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA", null}