mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-29 10:54:57 +01:00
Richard Smith
c04d62a7d1
Non-entry-block allocas will allocate new stack memory each time they're reached, resulting in leaking stack memory over time for allocas in a loop. Move all such allocas to the entry block instead, and use an LLVM intrinsic to mark when the lifetime of the variable actually begins.
75 lines
4.6 KiB
Plaintext
75 lines
4.6 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/tuple/access/element_access.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/tuple/access/element_access.carbon
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fn Run() -> i32 {
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var a: (i32, i32, i32) = (0, 1, 2);
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var b: i32 = a.0;
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var c: i32 = a.2;
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return 0;
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}
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// CHECK:STDOUT: ; ModuleID = 'element_access.carbon'
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// CHECK:STDOUT: source_filename = "element_access.carbon"
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// CHECK:STDOUT:
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// CHECK:STDOUT: @tuple.loc12_37 = internal constant { i32, i32, i32 } { i32 0, i32 1, i32 2 }
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// CHECK:STDOUT:
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// CHECK:STDOUT: define i32 @main() !dbg !4 {
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// CHECK:STDOUT: entry:
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// CHECK:STDOUT: %a.var = alloca { i32, i32, i32 }, align 8, !dbg !7
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// CHECK:STDOUT: %b.var = alloca i32, align 4, !dbg !7
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// CHECK:STDOUT: %c.var = alloca i32, align 4, !dbg !7
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 12, ptr %a.var), !dbg !7
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// CHECK:STDOUT: %tuple.elem0.loc12.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %a.var, i32 0, i32 0, !dbg !8
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// CHECK:STDOUT: %tuple.elem1.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %a.var, i32 0, i32 1, !dbg !8
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// CHECK:STDOUT: %tuple.elem2.loc12.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %a.var, i32 0, i32 2, !dbg !8
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// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %a.var, ptr align 4 @tuple.loc12_37, i64 12, i1 false), !dbg !9
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 4, ptr %b.var), !dbg !7
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// CHECK:STDOUT: %tuple.elem0.loc13.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %a.var, i32 0, i32 0, !dbg !10
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// CHECK:STDOUT: %.loc13 = load i32, ptr %tuple.elem0.loc13.tuple.elem, align 4, !dbg !10
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// CHECK:STDOUT: store i32 %.loc13, ptr %b.var, align 4, !dbg !11
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// CHECK:STDOUT: call void @llvm.lifetime.start.p0(i64 4, ptr %c.var), !dbg !7
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// CHECK:STDOUT: %tuple.elem2.loc14.tuple.elem = getelementptr inbounds nuw { i32, i32, i32 }, ptr %a.var, i32 0, i32 2, !dbg !12
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// CHECK:STDOUT: %.loc14 = load i32, ptr %tuple.elem2.loc14.tuple.elem, align 4, !dbg !12
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// CHECK:STDOUT: store i32 %.loc14, ptr %c.var, align 4, !dbg !13
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// CHECK:STDOUT: ret i32 0, !dbg !14
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
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// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
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// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1
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// CHECK:STDOUT:
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// CHECK:STDOUT: ; uselistorder directives
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// CHECK:STDOUT: uselistorder i32 1, { 2, 0, 1, 3, 4 }
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// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 2, 1, 0 }
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// CHECK:STDOUT:
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// CHECK:STDOUT: attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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// CHECK:STDOUT: attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
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// CHECK:STDOUT:
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// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
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// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
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// CHECK:STDOUT:
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// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
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// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
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// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
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// CHECK:STDOUT: !3 = !DIFile(filename: "element_access.carbon", directory: "")
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// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Run", linkageName: "main", scope: null, file: !3, line: 11, type: !5, spFlags: DISPFlagDefinition, unit: !2)
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// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
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// CHECK:STDOUT: !6 = !{}
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// CHECK:STDOUT: !7 = !DILocation(line: 12, column: 7, scope: !4)
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// CHECK:STDOUT: !8 = !DILocation(line: 12, column: 28, scope: !4)
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// CHECK:STDOUT: !9 = !DILocation(line: 12, column: 3, scope: !4)
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// CHECK:STDOUT: !10 = !DILocation(line: 13, column: 16, scope: !4)
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// CHECK:STDOUT: !11 = !DILocation(line: 13, column: 3, scope: !4)
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// CHECK:STDOUT: !12 = !DILocation(line: 14, column: 16, scope: !4)
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// CHECK:STDOUT: !13 = !DILocation(line: 14, column: 3, scope: !4)
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// CHECK:STDOUT: !14 = !DILocation(line: 15, column: 3, scope: !4)
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