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compiler: add object layout information to heap allocations

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This commit adds object layout information to new heap allocations. It
is not yet used anywhere: the next commit will make use of it.

Object layout information will eventually be used for a (mostly) precise
garbage collector. This is what the data is made for. However, it is
also useful in the interp package which can work better if it knows the
memory layout and thus the approximate LLVM type of heap-allocated
objects.
This commit is contained in:
Ayke van Laethem
2021-07-09 23:41:50 +02:00
committed by Ron Evans
parent f24a93c51d
commit 0704794def
9 changed files with 400 additions and 13 deletions
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compiler/testdata/slice.ll
Vendored
+5 -5
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@@ -44,7 +44,7 @@ declare void @runtime.lookupPanic(i8*, i8*)
; Function Attrs: nounwind
define hidden { i32*, i32, i32 } @main.sliceAppendValues(i32* %ints.data, i32 %ints.len, i32 %ints.cap, i8* %context, i8* %parentHandle) unnamed_addr #0 {
entry:
%varargs = call i8* @runtime.alloc(i32 12, i8* null, i8* undef, i8* null) #0
%varargs = call i8* @runtime.alloc(i32 12, i8* nonnull inttoptr (i32 3 to i8*), i8* undef, i8* null) #0
%0 = bitcast i8* %varargs to i32*
store i32 1, i32* %0, align 4
%1 = getelementptr inbounds i8, i8* %varargs, i32 4
@@ -105,7 +105,7 @@ slice.throw: ; preds = %entry
unreachable
slice.next: ; preds = %entry
%makeslice.buf = call i8* @runtime.alloc(i32 %len, i8* null, i8* undef, i8* null) #0
%makeslice.buf = call i8* @runtime.alloc(i32 %len, i8* nonnull inttoptr (i32 3 to i8*), i8* undef, i8* null) #0
%0 = insertvalue { i8*, i32, i32 } undef, i8* %makeslice.buf, 0
%1 = insertvalue { i8*, i32, i32 } %0, i32 %len, 1
%2 = insertvalue { i8*, i32, i32 } %1, i32 %len, 2
@@ -126,7 +126,7 @@ slice.throw: ; preds = %entry
slice.next: ; preds = %entry
%makeslice.cap = shl i32 %len, 1
%makeslice.buf = call i8* @runtime.alloc(i32 %makeslice.cap, i8* null, i8* undef, i8* null) #0
%makeslice.buf = call i8* @runtime.alloc(i32 %makeslice.cap, i8* nonnull inttoptr (i32 3 to i8*), i8* undef, i8* null) #0
%makeslice.array = bitcast i8* %makeslice.buf to i16*
%0 = insertvalue { i16*, i32, i32 } undef, i16* %makeslice.array, 0
%1 = insertvalue { i16*, i32, i32 } %0, i32 %len, 1
@@ -146,7 +146,7 @@ slice.throw: ; preds = %entry
slice.next: ; preds = %entry
%makeslice.cap = mul i32 %len, 3
%makeslice.buf = call i8* @runtime.alloc(i32 %makeslice.cap, i8* null, i8* undef, i8* null) #0
%makeslice.buf = call i8* @runtime.alloc(i32 %makeslice.cap, i8* nonnull inttoptr (i32 3 to i8*), i8* undef, i8* null) #0
%makeslice.array = bitcast i8* %makeslice.buf to [3 x i8]*
%0 = insertvalue { [3 x i8]*, i32, i32 } undef, [3 x i8]* %makeslice.array, 0
%1 = insertvalue { [3 x i8]*, i32, i32 } %0, i32 %len, 1
@@ -166,7 +166,7 @@ slice.throw: ; preds = %entry
slice.next: ; preds = %entry
%makeslice.cap = shl i32 %len, 2
%makeslice.buf = call i8* @runtime.alloc(i32 %makeslice.cap, i8* null, i8* undef, i8* null) #0
%makeslice.buf = call i8* @runtime.alloc(i32 %makeslice.cap, i8* nonnull inttoptr (i32 3 to i8*), i8* undef, i8* null) #0
%makeslice.array = bitcast i8* %makeslice.buf to i32*
%0 = insertvalue { i32*, i32, i32 } undef, i32* %makeslice.array, 0
%1 = insertvalue { i32*, i32, i32 } %0, i32 %len, 1