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e102360e48
Summary: Swift ABI is based on basic C ABI described here https://github.com/WebAssembly/tool-conventions/blob/master/BasicCABI.md Swift Calling Convention on WebAssembly is a little deffer from swiftcc on another architectures. On non WebAssembly arch, swiftcc accepts extra parameters that are attributed with swifterror or swiftself by caller. Even if callee doesn't have these parameters, the invocation succeed ignoring extra parameters. But WebAssembly strictly checks that callee and caller signatures are same. https://github.com/WebAssembly/design/blob/master/Semantics.md#calls So at WebAssembly level, all swiftcc functions end up extra arguments and all function definitions and invocations explicitly have additional parameters to fill swifterror and swiftself. This patch support signature difference for swiftself and swifterror cc is swiftcc. e.g. ``` declare swiftcc void @foo(i32, i32) @data = global i8* bitcast (void (i32, i32)* @foo to i8*) define swiftcc void @bar() { %1 = load i8*, i8** @data %2 = bitcast i8* %1 to void (i32, i32, i32)* call swiftcc void %2(i32 1, i32 2, i32 swiftself 3) ret void } ``` For swiftcc, emit additional swiftself and swifterror parameters if there aren't while lowering. These additional parameters are added for both callee and caller. They are necessary to match callee and caller signature for direct and indirect function call. Differential Revision: https://reviews.llvm.org/D76049
47 lines
1.7 KiB
LLVM
47 lines
1.7 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -wasm-keep-registers | FileCheck %s --check-prefix=REG
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; RUN: llc < %s -asm-verbose=false | FileCheck %s
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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; Test direct and indirect function call between mismatched signatures
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; CHECK-LABEL: foo:
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; CHECK-NEXT: .functype foo (i32, i32, i32, i32) -> ()
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define swiftcc void @foo(i32, i32) {
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ret void
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}
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@data = global i8* bitcast (void (i32, i32)* @foo to i8*)
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; CHECK-LABEL: bar:
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; CHECK-NEXT: .functype bar (i32, i32) -> ()
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define swiftcc void @bar() {
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%1 = load i8*, i8** @data
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; REG: call foo, $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}
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call swiftcc void @foo(i32 1, i32 2)
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%2 = bitcast i8* %1 to void (i32, i32)*
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; REG: call_indirect $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}
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; CHECK: call_indirect (i32, i32, i32, i32) -> ()
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call swiftcc void %2(i32 1, i32 2)
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%3 = bitcast i8* %1 to void (i32, i32, i32)*
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; REG: call_indirect $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}
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; CHECK: call_indirect (i32, i32, i32, i32) -> ()
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call swiftcc void %3(i32 1, i32 2, i32 swiftself 3)
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%err = alloca swifterror i32*, align 4
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%4 = bitcast i8* %1 to void (i32, i32, i32**)*
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; REG: call_indirect $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}
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; CHECK: call_indirect (i32, i32, i32, i32) -> ()
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call swiftcc void %4(i32 1, i32 2, i32** swifterror %err)
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%5 = bitcast i8* %1 to void (i32, i32, i32, i32**)*
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; REG: call_indirect $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}, $pop{{[0-9]+}}
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; CHECK: call_indirect (i32, i32, i32, i32) -> ()
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call swiftcc void %5(i32 1, i32 2, i32 swiftself 3, i32** swifterror %err)
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ret void
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}
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