e7a05b6e74
The LLVM CoroFrame pass appears to be tripping over this zero-sized alloca. Therefore, do what the runtime would do: return a pointer to runtime.zeroSizedAlloc. Or just don't deal with this case. But don't emit a zero sized alloca to avoid this LLVM bug. More information: https://bugs.llvm.org/show_bug.cgi?id=49916
85 строки
2,1 КиБ
LLVM
85 строки
2,1 КиБ
LLVM
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
|
|
target triple = "armv7m-none-eabi"
|
|
|
|
@runtime.zeroSizedAlloc = internal global i8 0, align 1
|
|
|
|
declare nonnull i8* @runtime.alloc(i32)
|
|
|
|
; Test allocating a single int (i32) that should be allocated on the stack.
|
|
define void @testInt() {
|
|
%1 = call i8* @runtime.alloc(i32 4)
|
|
%2 = bitcast i8* %1 to i32*
|
|
store i32 5, i32* %2
|
|
ret void
|
|
}
|
|
|
|
; Test allocating an array of 3 i16 values that should be allocated on the
|
|
; stack.
|
|
define i16 @testArray() {
|
|
%1 = call i8* @runtime.alloc(i32 6)
|
|
%2 = bitcast i8* %1 to i16*
|
|
%3 = getelementptr i16, i16* %2, i32 1
|
|
store i16 5, i16* %3
|
|
%4 = getelementptr i16, i16* %2, i32 2
|
|
%5 = load i16, i16* %4
|
|
ret i16 %5
|
|
}
|
|
|
|
; Call a function that will let the pointer escape, so the heap-to-stack
|
|
; transform shouldn't be applied.
|
|
define void @testEscapingCall() {
|
|
%1 = call i8* @runtime.alloc(i32 4)
|
|
%2 = bitcast i8* %1 to i32*
|
|
%3 = call i32* @escapeIntPtr(i32* %2)
|
|
ret void
|
|
}
|
|
|
|
define void @testEscapingCall2() {
|
|
%1 = call i8* @runtime.alloc(i32 4)
|
|
%2 = bitcast i8* %1 to i32*
|
|
%3 = call i32* @escapeIntPtrSometimes(i32* %2, i32* %2)
|
|
ret void
|
|
}
|
|
|
|
; Call a function that doesn't let the pointer escape.
|
|
define void @testNonEscapingCall() {
|
|
%1 = call i8* @runtime.alloc(i32 4)
|
|
%2 = bitcast i8* %1 to i32*
|
|
%3 = call i32* @noescapeIntPtr(i32* %2)
|
|
ret void
|
|
}
|
|
|
|
; Return the allocated value, which lets it escape.
|
|
define i32* @testEscapingReturn() {
|
|
%1 = call i8* @runtime.alloc(i32 4)
|
|
%2 = bitcast i8* %1 to i32*
|
|
ret i32* %2
|
|
}
|
|
|
|
; Do a non-escaping allocation in a loop.
|
|
define void @testNonEscapingLoop() {
|
|
entry:
|
|
br label %loop
|
|
loop:
|
|
%0 = call i8* @runtime.alloc(i32 4)
|
|
%1 = bitcast i8* %0 to i32*
|
|
%2 = call i32* @noescapeIntPtr(i32* %1)
|
|
%3 = icmp eq i32* null, %2
|
|
br i1 %3, label %loop, label %end
|
|
end:
|
|
ret void
|
|
}
|
|
|
|
; Test a zero-sized allocation.
|
|
define void @testZeroSizedAlloc() {
|
|
%1 = call i8* @runtime.alloc(i32 0)
|
|
%2 = bitcast i8* %1 to i32*
|
|
%3 = call i32* @noescapeIntPtr(i32* %2)
|
|
ret void
|
|
}
|
|
|
|
declare i32* @escapeIntPtr(i32*)
|
|
|
|
declare i32* @noescapeIntPtr(i32* nocapture)
|
|
|
|
declare i32* @escapeIntPtrSometimes(i32* nocapture, i32*)
|