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wasm: another attempt to make class reference visible in chrome dev tools

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This commit is contained in:
Alexey Andreev 2023-08-27 00:26:03 +02:00
parent cacf09dca8
commit 36060b37e3
2 changed files with 34 additions and 20 deletions
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3
core/src/main/java/org/teavm/backend/wasm/dwarf/DwarfConstants.java
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@ -25,6 +25,7 @@ public final class DwarfConstants {
public static final int DW_TAG_MEMBER = 0x0d;
public static final int DW_TAG_POINTER_TYPE = 0x0F;
public static final int DW_TAG_COMPILE_UNIT = 0x11;
public static final int DW_TAG_STRUCTURE_TYPE = 0x13;
public static final int DW_TAG_INHERITANCE = 0x1C;
public static final int DW_TAG_BASE_TYPE = 0x24;
public static final int DW_TAG_SUBPROGRAM = 0x2E;
@ -48,6 +49,7 @@ public final class DwarfConstants {
public static final int DW_AT_ENCODING = 0x3E;
public static final int DW_AT_SPECIFICATION = 0x47;
public static final int DW_AT_TYPE = 0x49;
public static final int DW_AT_DATA_LOCATION = 0x50;
public static final int DW_AT_LINKAGE_NAME = 0x6E;
public static final int DW_ATE_ADDRESS = 0x01;
@ -84,6 +86,7 @@ public final class DwarfConstants {
public static final int DW_OP_SHL = 0x24;
public static final int DW_OP_LIT0 = 0x30;
public static final int DW_OP_LIT3 = 0x33;
public static final int DW_OP_PUSH_OBJECT_ADDRESS = 0x97;
public static final int DW_OP_STACK_VALUE = 0x9F;
public static final int DW_OP_WASM_LOCATION = 0xED;

51
core/src/main/java/org/teavm/backend/wasm/generate/DwarfClassGenerator.java
View File

@ -15,21 +15,17 @@
*/
package org.teavm.backend.wasm.generate;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_ACCESS_PUBLIC;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_ATE_BOOLEAN;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_ATE_FLOAT;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_ATE_SIGNED;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_ATE_UTF;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_ACCESSIBILITY;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_BYTE_SIZE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_CALLING_CONVENTION;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_CONTAINING_TYPE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_DATA_LOCATION;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_DATA_MEMBER_LOCATION;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_ENCODING;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_LOCATION;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_NAME;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_AT_TYPE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_CC_PASS_BY_REFERENCE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_FORM_DATA1;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_FORM_DATA2;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_FORM_EXPRLOC;
@ -38,13 +34,16 @@ import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_FORM_STRP;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_OP_ADDR;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_OP_DEREF;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_OP_LIT3;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_OP_PUSH_OBJECT_ADDRESS;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_OP_SHL;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_OP_STACK_VALUE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_TAG_BASE_TYPE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_TAG_CLASS_TYPE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_TAG_INHERITANCE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_TAG_MEMBER;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_TAG_NAMESPACE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_TAG_POINTER_TYPE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_TAG_STRUCTURE_TYPE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_TAG_UNSPECIFIED_TYPE;
import static org.teavm.backend.wasm.dwarf.DwarfConstants.DW_TAG_VARIABLE;
import java.util.ArrayList;
@ -82,11 +81,33 @@ public class DwarfClassGenerator {
private List<Runnable> postponedWrites = new ArrayList<>();
private ClassType classClass;
private DwarfFunctionGenerator functionGen;
private DwarfPlaceholder fakeClassPtrStruct;
public DwarfClassGenerator(DwarfInfoWriter writer, DwarfStrings strings) {
this.writer = writer;
this.strings = strings;
functionGen = new DwarfFunctionGenerator(this, writer, strings);
fakeClassPtrStruct = writer.placeholder(4);
}
private void createFakeClassPtrStruct() {
var abbrev = writer.abbreviation(DW_TAG_STRUCTURE_TYPE, true, data -> {
data.writeLEB(DW_AT_DATA_LOCATION).writeLEB(DW_FORM_EXPRLOC);
});
writer.mark(fakeClassPtrStruct).tag(abbrev);
var ops = new Blob();
ops.writeByte(DW_OP_PUSH_OBJECT_ADDRESS).writeByte(DW_OP_DEREF).writeByte(DW_OP_LIT3).writeByte(DW_OP_SHL);
writer.writeLEB(ops.size());
ops.newReader(writer::write).readRemaining();
writer.tag(getImmutableMemberAbbrev());
writer.writeInt(strings.stringRef("value"));
writer.ref(classClass.getPointerPtr(), Blob::writeInt);
writer.writeShort(0);
writer.emptyTag();
}
public void flushTypes() {
@ -124,6 +145,7 @@ public class DwarfClassGenerator {
public void write() {
classClass = getClass("java.lang.Class");
createFakeClassPtrStruct();
root.writeChildren();
for (var subprogram : rootSubprograms) {
subprogram.write();
@ -144,9 +166,7 @@ public class DwarfClassGenerator {
if (classTypeAbbrev == null) {
classTypeAbbrev = writer.abbreviation(DW_TAG_CLASS_TYPE, true, data -> {
data.writeLEB(DW_AT_NAME).writeLEB(DW_FORM_STRP);
data.writeLEB(DW_AT_CONTAINING_TYPE).writeLEB(DW_FORM_REF4);
data.writeLEB(DW_AT_BYTE_SIZE).writeLEB(DW_FORM_DATA2);
data.writeLEB(DW_AT_CALLING_CONVENTION).writeLEB(DW_FORM_DATA1);
});
}
return classTypeAbbrev;
@ -166,8 +186,7 @@ public class DwarfClassGenerator {
immutableMemberAbbrev = writer.abbreviation(DW_TAG_MEMBER, false, data -> {
data.writeLEB(DW_AT_NAME).writeLEB(DW_FORM_STRP);
data.writeLEB(DW_AT_TYPE).writeLEB(DW_FORM_REF4);
data.writeLEB(DW_AT_DATA_MEMBER_LOCATION).writeLEB(DW_FORM_EXPRLOC);
data.writeLEB(DW_AT_ACCESSIBILITY).writeLEB(DW_FORM_DATA1);
data.writeLEB(DW_AT_DATA_MEMBER_LOCATION).writeLEB(DW_FORM_DATA2);
});
}
return immutableMemberAbbrev;
@ -179,7 +198,6 @@ public class DwarfClassGenerator {
data.writeLEB(DW_AT_NAME).writeLEB(DW_FORM_STRP);
data.writeLEB(DW_AT_TYPE).writeLEB(DW_FORM_REF4);
data.writeLEB(DW_AT_DATA_MEMBER_LOCATION).writeLEB(DW_FORM_DATA2);
data.writeLEB(DW_AT_ACCESSIBILITY).writeLEB(DW_FORM_DATA1);
});
}
return memberAbbrev;
@ -410,9 +428,7 @@ public class DwarfClassGenerator {
private void write() {
writer.mark(ptr).tag(getClassTypeAbbrev());
writer.writeInt(strings.stringRef(name));
writer.ref(ptr, Blob::writeInt);
writer.writeShort(size);
writer.writeByte(DW_CC_PASS_BY_REFERENCE);
if (superclass != null) {
writer.tag(getInheritanceAbbrev()).ref(superclass.ptr, Blob::writeInt);
}
@ -428,7 +444,7 @@ public class DwarfClassGenerator {
writer.writeInt(strings.stringRef("__classData__"));
writer.ref(classClass.getPointerPtr(), Blob::writeInt);
var ops = new Blob();
ops.writeByte(DW_OP_ADDR).writeInt(pointer);
ops.writeByte(DW_OP_ADDR).writeInt(pointer).writeByte(DW_OP_STACK_VALUE);
writer.writeLEB(ops.size());
ops.newReader(writer::write).readRemaining();
}
@ -442,12 +458,8 @@ public class DwarfClassGenerator {
private void writeClassPointerField() {
writer.tag(getImmutableMemberAbbrev());
writer.writeInt(strings.stringRef("__class__"));
writer.ref(classClass.ptr, Blob::writeInt);
var ops = new Blob();
ops.writeByte(DW_OP_DEREF).writeByte(DW_OP_LIT3).writeByte(DW_OP_SHL);
writer.writeLEB(ops.size());
ops.newReader(writer::write).readRemaining();
writer.writeByte(DW_ACCESS_PUBLIC);
writer.ref(fakeClassPtrStruct, Blob::writeInt);
writer.writeShort(0);
}
private void writeFields() {
@ -504,7 +516,6 @@ public class DwarfClassGenerator {
writer.writeInt(strings.stringRef(name));
writer.ref(getTypePtr(type), Blob::writeInt);
writer.writeShort(offset);
writer.writeByte(DW_ACCESS_PUBLIC);
}
}